* [PATCH v2 0/5] Add Intel LJCA device driver
@ 2023-02-25 14:01 Ye Xiang
2023-02-25 14:01 ` [PATCH v2 1/5] mfd: Add support for Intel LJCA device Ye Xiang
` (4 more replies)
0 siblings, 5 replies; 9+ messages in thread
From: Ye Xiang @ 2023-02-25 14:01 UTC (permalink / raw
To: Lee Jones, Wolfram Sang, Tyrone Ting, Mark Brown, Linus Walleij,
Bartosz Golaszewski, linux-i2c, linux-kernel, linux-spi,
linux-gpio
Cc: srinivas.pandruvada, heikki.krogerus, andriy.shevchenko,
sakari.ailus, zhifeng.wang, wentong.wu, lixu.zhang, Ye Xiang
Add driver for Intel La Jolla Cove Adapter (LJCA) device.
This is a USB-GPIO, USB-I2C and USB-SPI device. We add 4
drivers to support this device: a USB driver, a GPIO chip
driver, a I2C controller driver and a SPI controller driver.
---
v2:
- ljca: remove reset command.
- gpio/spi/i2c: add `default MFD_LJCA` in Kconfig.
- gpio: add "select GPIOLIB_IRQCHIP" in Kconfig.
Ye Xiang (5):
mfd: Add support for Intel LJCA device
gpio: Add support for Intel LJCA USB GPIO driver
i2c: Add support for Intel LJCA USB I2C driver
spi: Add support for Intel LJCA USB SPI driver
Documentation: Add ABI doc for attributes of LJCA device
.../ABI/testing/sysfs-bus-usb-devices-ljca | 22 +
drivers/gpio/Kconfig | 12 +
drivers/gpio/Makefile | 1 +
drivers/gpio/gpio-ljca.c | 454 ++++++++
drivers/i2c/busses/Kconfig | 11 +
drivers/i2c/busses/Makefile | 1 +
drivers/i2c/busses/i2c-ljca.c | 357 +++++++
drivers/mfd/Kconfig | 13 +
drivers/mfd/Makefile | 1 +
drivers/mfd/ljca.c | 969 ++++++++++++++++++
drivers/spi/Kconfig | 11 +
drivers/spi/Makefile | 1 +
drivers/spi/spi-ljca.c | 291 ++++++
include/linux/mfd/ljca.h | 95 ++
14 files changed, 2239 insertions(+)
create mode 100644 Documentation/ABI/testing/sysfs-bus-usb-devices-ljca
create mode 100644 drivers/gpio/gpio-ljca.c
create mode 100644 drivers/i2c/busses/i2c-ljca.c
create mode 100644 drivers/mfd/ljca.c
create mode 100644 drivers/spi/spi-ljca.c
create mode 100644 include/linux/mfd/ljca.h
--
2.34.1
^ permalink raw reply [flat|nested] 9+ messages in thread
* [PATCH v2 1/5] mfd: Add support for Intel LJCA device
2023-02-25 14:01 [PATCH v2 0/5] Add Intel LJCA device driver Ye Xiang
@ 2023-02-25 14:01 ` Ye Xiang
2023-02-25 14:01 ` [PATCH v2 2/5] gpio: Add support for Intel LJCA USB GPIO driver Ye Xiang
` (3 subsequent siblings)
4 siblings, 0 replies; 9+ messages in thread
From: Ye Xiang @ 2023-02-25 14:01 UTC (permalink / raw
To: Lee Jones, Wolfram Sang, Tyrone Ting, Mark Brown, Linus Walleij,
Bartosz Golaszewski, linux-i2c, linux-kernel, linux-spi,
linux-gpio
Cc: srinivas.pandruvada, heikki.krogerus, andriy.shevchenko,
sakari.ailus, zhifeng.wang, wentong.wu, lixu.zhang, Ye Xiang
This patch implements the USB part of Intel USB-I2C/GPIO/SPI adapter
device named "La Jolla Cove Adapter" (LJCA).
The communication between the various LJCA module drivers and the
hardware will be muxed/demuxed by this driver. The sub-module of
LJCA can use ljca_transfer() to issue a transfer between host
and hardware.
Each sub-module of LJCA device is identified by type field within
the LJCA message header.
The minimum code in ASL that covers this board is
Scope (\_SB.PCI0.DWC3.RHUB.HS01)
{
Device (GPIO)
{
Name (_ADR, Zero)
Name (_STA, 0x0F)
}
Device (I2C)
{
Name (_ADR, One)
Name (_STA, 0x0F)
}
Device (SPI)
{
Name (_ADR, 0x02)
Name (_STA, 0x0F)
}
}
Signed-off-by: Ye Xiang <xiang.ye@intel.com>
---
drivers/mfd/Kconfig | 13 +
drivers/mfd/Makefile | 1 +
drivers/mfd/ljca.c | 969 +++++++++++++++++++++++++++++++++++++++
include/linux/mfd/ljca.h | 95 ++++
4 files changed, 1078 insertions(+)
create mode 100644 drivers/mfd/ljca.c
create mode 100644 include/linux/mfd/ljca.h
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 30db49f31866..f74df74d7f30 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -411,6 +411,19 @@ config MFD_DLN2
etc. must be enabled in order to use the functionality of
the device.
+config MFD_LJCA
+ tristate "Intel La Jolla Cove Adapter support"
+ select MFD_CORE
+ depends on USB
+ help
+ This adds support for Intel La Jolla Cove USB-I2C/SPI/GPIO
+ Master Adapter (LJCA). Additional drivers such as I2C_LJCA,
+ GPIO_LJCA and SPI_LJCA must be enabled in order to use the
+ functionality of the device.
+
+ This driver can also be built as a module. If so, the module
+ will be called ljca.
+
config MFD_ENE_KB3930
tristate "ENE KB3930 Embedded Controller support"
depends on I2C
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 457471478a93..b1831cf4d6ed 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -237,6 +237,7 @@ obj-$(CONFIG_MFD_HI6421_PMIC) += hi6421-pmic-core.o
obj-$(CONFIG_MFD_HI6421_SPMI) += hi6421-spmi-pmic.o
obj-$(CONFIG_MFD_HI655X_PMIC) += hi655x-pmic.o
obj-$(CONFIG_MFD_DLN2) += dln2.o
+obj-$(CONFIG_MFD_LJCA) += ljca.o
obj-$(CONFIG_MFD_RT4831) += rt4831.o
obj-$(CONFIG_MFD_RT5033) += rt5033.o
obj-$(CONFIG_MFD_RT5120) += rt5120.o
diff --git a/drivers/mfd/ljca.c b/drivers/mfd/ljca.c
new file mode 100644
index 000000000000..e9520f3d2904
--- /dev/null
+++ b/drivers/mfd/ljca.c
@@ -0,0 +1,969 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Intel La Jolla Cove Adapter USB driver
+ *
+ * Copyright (c) 2023, Intel Corporation.
+ */
+
+#include <linux/dev_printk.h>
+#include <linux/kernel.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/ljca.h>
+#include <linux/module.h>
+#include <linux/mod_devicetable.h>
+#include <linux/mutex.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+#include <linux/usb.h>
+
+enum ljca_acpi_match_adr {
+ LJCA_ACPI_MATCH_GPIO,
+ LJCA_ACPI_MATCH_I2C1,
+ LJCA_ACPI_MATCH_I2C2,
+ LJCA_ACPI_MATCH_SPI1,
+ LJCA_ACPI_MATCH_SPI2,
+};
+
+static struct mfd_cell_acpi_match ljca_acpi_match_gpio = {
+ .adr = LJCA_ACPI_MATCH_GPIO,
+};
+
+static struct mfd_cell_acpi_match ljca_acpi_match_i2cs[] = {
+ {
+ .adr = LJCA_ACPI_MATCH_I2C1,
+ },
+ {
+ .adr = LJCA_ACPI_MATCH_I2C2,
+ },
+};
+
+static struct mfd_cell_acpi_match ljca_acpi_match_spis[] = {
+ {
+ .adr = LJCA_ACPI_MATCH_SPI1,
+ },
+ {
+ .adr = LJCA_ACPI_MATCH_SPI2,
+ },
+};
+
+struct ljca_msg {
+ u8 type;
+ u8 cmd;
+ u8 flags;
+ u8 len;
+ u8 data[];
+} __packed;
+
+struct fw_version {
+ u8 major;
+ u8 minor;
+ __le16 patch;
+ __le16 build;
+} __packed;
+
+/**
+ * enum ljca_stub_type - Stub type supported by LJCA.
+ * @LJCA_MNG_STUB: Provides Management messages.
+ * @LJCA_DIAG_STUB: provides Diagnose messages.
+ * @LJCA_GPIO_STUB: provides GPIO functionality.
+ * @LJCA_I2C_STUB: provides I2C functionality.
+ * @LJCA_SPI_STUB: provides SPI functionality.
+ */
+enum ljca_stub_type {
+ LJCA_MNG_STUB = 1,
+ LJCA_DIAG_STUB,
+ LJCA_GPIO_STUB,
+ LJCA_I2C_STUB,
+ LJCA_SPI_STUB,
+};
+
+/* command Flags */
+#define LJCA_ACK_FLAG BIT(0)
+#define LJCA_RESP_FLAG BIT(1)
+#define LJCA_CMPL_FLAG BIT(2)
+
+/* MNG stub commands */
+enum ljca_mng_cmd {
+ LJCA_MNG_GET_VERSION = 1,
+ LJCA_MNG_RESET_NOTIFY,
+ LJCA_MNG_RESET,
+ LJCA_MNG_ENUM_GPIO,
+ LJCA_MNG_ENUM_I2C,
+ LJCA_MNG_POWER_STATE_CHANGE,
+ LJCA_MNG_SET_DFU_MODE,
+ LJCA_MNG_ENUM_SPI,
+};
+
+/* DIAG commands */
+enum ljca_diag_cmd {
+ LJCA_DIAG_GET_STATE = 1,
+ LJCA_DIAG_GET_STATISTIC,
+ LJCA_DIAG_SET_TRACE_LEVEL,
+ LJCA_DIAG_SET_ECHO_MODE,
+ LJCA_DIAG_GET_FW_LOG,
+ LJCA_DIAG_GET_FW_COREDUMP,
+ LJCA_DIAG_TRIGGER_WDT,
+ LJCA_DIAG_TRIGGER_FAULT,
+ LJCA_DIAG_FEED_WDT,
+ LJCA_DIAG_GET_SECURE_STATE,
+};
+
+struct ljca_i2c_ctr_info {
+ u8 id;
+ u8 capacity;
+ u8 intr_pin;
+} __packed;
+
+struct ljca_i2c_descriptor {
+ u8 num;
+ struct ljca_i2c_ctr_info info[];
+} __packed;
+
+struct ljca_spi_ctr_info {
+ u8 id;
+ u8 capacity;
+} __packed;
+
+struct ljca_spi_descriptor {
+ u8 num;
+ struct ljca_spi_ctr_info info[];
+} __packed;
+
+struct ljca_bank_descriptor {
+ u8 bank_id;
+ u8 pin_num;
+
+ /* 1 bit for each gpio, 1 means valid */
+ u32 valid_pins;
+} __packed;
+
+struct ljca_gpio_descriptor {
+ u8 pins_per_bank;
+ u8 bank_num;
+ struct ljca_bank_descriptor bank_desc[];
+} __packed;
+
+#define LJCA_MAX_PACKET_SIZE 64
+#define LJCA_MAX_PAYLOAD_SIZE (LJCA_MAX_PACKET_SIZE - sizeof(struct ljca_msg))
+#define LJCA_USB_WRITE_TIMEOUT_MS 200
+#define LJCA_USB_WRITE_ACK_TIMEOUT_MS 500
+#define LJCA_USB_ENUM_STUB_TIMEOUT_MS 20
+
+struct ljca_event_cb_entry {
+ ljca_event_cb_t notify;
+ void *context;
+};
+
+struct ljca_dev {
+ struct usb_device *udev;
+ struct usb_interface *intf;
+ u8 in_ep; /* the address of the bulk in endpoint */
+ u8 out_ep; /* the address of the bulk out endpoint */
+
+ /* the urb/buffer for read */
+ struct urb *in_urb;
+ unsigned char *ibuf;
+ size_t ibuf_len;
+
+ bool started;
+ struct list_head stubs_list;
+
+ /* to wait for an ongoing write ack */
+ wait_queue_head_t ack_wq;
+
+ struct mfd_cell *cells;
+ int cell_count;
+ /* mutex to protect package transfer with LJCA device */
+ struct mutex mutex;
+};
+
+struct ljca {
+ u8 type;
+ struct ljca_dev *dev;
+};
+
+struct ljca_stub_packet {
+ unsigned int *ibuf_len;
+ u8 *ibuf;
+};
+
+struct ljca_stub {
+ struct list_head list;
+ struct usb_interface *intf;
+ struct ljca_stub_packet ipacket;
+ u8 type;
+
+ /* for identify ack */
+ bool acked;
+ int cur_cmd;
+
+ struct ljca_event_cb_entry event_entry;
+ /* lock to protect event_entry */
+ spinlock_t event_cb_lock;
+
+ struct ljca ljca;
+ unsigned long priv[];
+};
+
+static inline void *ljca_priv(struct ljca_stub *stub)
+{
+ return stub->priv;
+}
+
+static bool ljca_validate(struct ljca_msg *header, u32 data_len)
+{
+ return header->len + sizeof(*header) == data_len;
+}
+
+static struct ljca_stub *ljca_stub_alloc(struct ljca_dev *dev, u8 type, int priv_size)
+{
+ struct ljca_stub *stub;
+
+ stub = kzalloc(struct_size(stub, priv, priv_size), GFP_KERNEL);
+ if (!stub)
+ return ERR_PTR(-ENOMEM);
+
+ stub->type = type;
+ stub->intf = dev->intf;
+ stub->ljca.dev = dev;
+ stub->ljca.type = stub->type;
+ spin_lock_init(&stub->event_cb_lock);
+ list_add_tail(&stub->list, &dev->stubs_list);
+ return stub;
+}
+
+static struct ljca_stub *ljca_stub_find(struct ljca_dev *dev, u8 type)
+{
+ struct ljca_stub *stub;
+
+ list_for_each_entry(stub, &dev->stubs_list, list) {
+ if (stub->type == type)
+ return stub;
+ }
+
+ dev_err(&dev->intf->dev, "USB stub not found, type:%d\n", type);
+ return ERR_PTR(-ENODEV);
+}
+
+static void ljca_stub_notify(struct ljca_stub *stub, u8 cmd, const void *evt_data, int len)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&stub->event_cb_lock, flags);
+ if (stub->event_entry.notify && stub->event_entry.context)
+ stub->event_entry.notify(stub->event_entry.context, cmd, evt_data, len);
+ spin_unlock_irqrestore(&stub->event_cb_lock, flags);
+}
+
+static int ljca_parse(struct ljca_dev *dev, struct ljca_msg *header)
+{
+ struct ljca_stub *stub;
+
+ stub = ljca_stub_find(dev, header->type);
+ if (IS_ERR(stub))
+ return PTR_ERR(stub);
+
+ if (!(header->flags & LJCA_ACK_FLAG)) {
+ ljca_stub_notify(stub, header->cmd, header->data, header->len);
+ return 0;
+ }
+
+ if (stub->cur_cmd != header->cmd) {
+ dev_err(&dev->intf->dev, "header and stub current command mismatch (%x vs %x)\n",
+ header->cmd, stub->cur_cmd);
+ return -EINVAL;
+ }
+
+ if (stub->ipacket.ibuf && stub->ipacket.ibuf_len) {
+ unsigned int newlen;
+
+ newlen = min_t(unsigned int, header->len, *stub->ipacket.ibuf_len);
+
+ *stub->ipacket.ibuf_len = newlen;
+ memcpy(stub->ipacket.ibuf, header->data, newlen);
+ }
+
+ stub->acked = true;
+ wake_up(&dev->ack_wq);
+
+ return 0;
+}
+
+static int ljca_stub_write(struct ljca_stub *stub, u8 cmd, const void *obuf, unsigned int obuf_len,
+ void *ibuf, unsigned int *ibuf_len, bool wait_ack, unsigned long timeout)
+{
+ struct ljca_dev *dev = usb_get_intfdata(stub->intf);
+ u8 flags = LJCA_CMPL_FLAG;
+ struct ljca_msg *header;
+ unsigned int msg_len = sizeof(*header) + obuf_len;
+ int actual;
+ int ret;
+
+ if (msg_len > LJCA_MAX_PACKET_SIZE)
+ return -EINVAL;
+
+ if (wait_ack)
+ flags |= LJCA_ACK_FLAG;
+
+ header = kmalloc(msg_len, GFP_KERNEL);
+ if (!header)
+ return -ENOMEM;
+
+ header->type = stub->type;
+ header->cmd = cmd;
+ header->flags = flags;
+ header->len = obuf_len;
+
+ if (obuf)
+ memcpy(header->data, obuf, obuf_len);
+
+ dev_dbg(&dev->intf->dev, "send: type:%d cmd:%d flags:%d len:%d\n", header->type,
+ header->cmd, header->flags, header->len);
+
+ usb_autopm_get_interface(dev->intf);
+ if (!dev->started) {
+ ret = -ENODEV;
+ goto error_put;
+ }
+
+ mutex_lock(&dev->mutex);
+ stub->cur_cmd = cmd;
+ stub->ipacket.ibuf = ibuf;
+ stub->ipacket.ibuf_len = ibuf_len;
+ stub->acked = false;
+ ret = usb_bulk_msg(dev->udev, usb_sndbulkpipe(dev->udev, dev->out_ep), header, msg_len,
+ &actual, LJCA_USB_WRITE_TIMEOUT_MS);
+ kfree(header);
+ if (ret) {
+ dev_err(&dev->intf->dev, "bridge write failed ret:%d\n", ret);
+ goto error_unlock;
+ }
+
+ if (actual != msg_len) {
+ dev_err(&dev->intf->dev, "bridge write length mismatch (%d vs %d)\n", msg_len,
+ actual);
+ ret = -EINVAL;
+ goto error_unlock;
+ }
+
+ if (wait_ack) {
+ ret = wait_event_timeout(dev->ack_wq, stub->acked, msecs_to_jiffies(timeout));
+ if (!ret) {
+ dev_err(&dev->intf->dev, "acked wait timeout\n");
+ ret = -ETIMEDOUT;
+ goto error_unlock;
+ }
+ }
+
+ stub->ipacket.ibuf = NULL;
+ stub->ipacket.ibuf_len = NULL;
+ ret = 0;
+error_unlock:
+ mutex_unlock(&dev->mutex);
+error_put:
+ usb_autopm_put_interface(dev->intf);
+ return ret;
+}
+
+static int ljca_transfer_internal(struct ljca *ljca, u8 cmd, const void *obuf,
+ unsigned int obuf_len, void *ibuf, unsigned int *ibuf_len,
+ bool wait_ack)
+{
+ struct ljca_stub *stub;
+
+ stub = ljca_stub_find(ljca->dev, ljca->type);
+ if (IS_ERR(stub))
+ return PTR_ERR(stub);
+
+ return ljca_stub_write(stub, cmd, obuf, obuf_len, ibuf, ibuf_len, wait_ack,
+ LJCA_USB_WRITE_ACK_TIMEOUT_MS);
+}
+
+int ljca_transfer(struct ljca *ljca, u8 cmd, const void *obuf, unsigned int obuf_len, void *ibuf,
+ unsigned int *ibuf_len)
+{
+ return ljca_transfer_internal(ljca, cmd, obuf, obuf_len, ibuf, ibuf_len, true);
+}
+EXPORT_SYMBOL_NS_GPL(ljca_transfer, LJCA);
+
+int ljca_transfer_noack(struct ljca *ljca, u8 cmd, const void *obuf, unsigned int obuf_len)
+{
+ return ljca_transfer_internal(ljca, cmd, obuf, obuf_len, NULL, NULL, false);
+}
+EXPORT_SYMBOL_NS_GPL(ljca_transfer_noack, LJCA);
+
+int ljca_register_event_cb(struct ljca *ljca, ljca_event_cb_t event_cb, void *context)
+{
+ struct ljca_stub *stub;
+ unsigned long flags;
+
+ stub = ljca_stub_find(ljca->dev, ljca->type);
+ if (IS_ERR(stub))
+ return PTR_ERR(stub);
+
+ spin_lock_irqsave(&stub->event_cb_lock, flags);
+ stub->event_entry.notify = event_cb;
+ stub->event_entry.context = context;
+ spin_unlock_irqrestore(&stub->event_cb_lock, flags);
+
+ return 0;
+}
+EXPORT_SYMBOL_NS_GPL(ljca_register_event_cb, LJCA);
+
+void ljca_unregister_event_cb(struct ljca *ljca)
+{
+ struct ljca_stub *stub;
+ unsigned long flags;
+
+ stub = ljca_stub_find(ljca->dev, ljca->type);
+ if (IS_ERR(stub))
+ return;
+
+ spin_lock_irqsave(&stub->event_cb_lock, flags);
+ stub->event_entry.notify = NULL;
+ stub->event_entry.context = NULL;
+ spin_unlock_irqrestore(&stub->event_cb_lock, flags);
+}
+EXPORT_SYMBOL_NS_GPL(ljca_unregister_event_cb, LJCA);
+
+static void ljca_stub_cleanup(struct ljca_dev *dev)
+{
+ struct ljca_stub *stub, *next;
+
+ list_for_each_entry_safe(stub, next, &dev->stubs_list, list) {
+ list_del_init(&stub->list);
+ kfree(stub);
+ }
+}
+
+static void ljca_read_complete(struct urb *urb)
+{
+ struct ljca_msg *header = urb->transfer_buffer;
+ struct ljca_dev *dev = urb->context;
+ int len = urb->actual_length;
+ int ret;
+
+ WARN_ON_ONCE(!dev);
+ WARN_ON_ONCE(!header);
+
+ if (urb->status) {
+ /* sync/async unlink faults aren't errors */
+ if (urb->status == -ENOENT || urb->status == -ECONNRESET ||
+ urb->status == -ESHUTDOWN)
+ return;
+
+ dev_err(&dev->intf->dev, "read bulk urb transfer failed: %d\n", urb->status);
+ goto resubmit;
+ }
+
+ dev_dbg(&dev->intf->dev, "receive: type:%d cmd:%d flags:%d len:%d\n", header->type,
+ header->cmd, header->flags, header->len);
+
+ if (!ljca_validate(header, len)) {
+ dev_err(&dev->intf->dev, "data not correct header->len:%d payload_len:%d\n ",
+ header->len, len);
+ goto resubmit;
+ }
+
+ ret = ljca_parse(dev, header);
+ if (ret)
+ dev_err(&dev->intf->dev, "failed to parse data: ret:%d type:%d len:%d\n", ret,
+ header->type, header->len);
+
+resubmit:
+ ret = usb_submit_urb(urb, GFP_ATOMIC);
+ if (ret)
+ dev_err(&dev->intf->dev, "failed submitting read urb, error %d\n", ret);
+}
+
+static int ljca_start(struct ljca_dev *dev)
+{
+ int ret;
+
+ usb_fill_bulk_urb(dev->in_urb, dev->udev, usb_rcvbulkpipe(dev->udev, dev->in_ep), dev->ibuf,
+ dev->ibuf_len, ljca_read_complete, dev);
+
+ ret = usb_submit_urb(dev->in_urb, GFP_KERNEL);
+ if (ret)
+ dev_err(&dev->intf->dev, "failed submitting read urb, error %d\n", ret);
+
+ dev->started = true;
+ return ret;
+}
+
+struct ljca_mng_priv {
+ u32 reset_id;
+};
+
+static int ljca_mng_reset_handshake(struct ljca_stub *stub)
+{
+ struct ljca_mng_priv *priv;
+ __le32 reset_id;
+ __le32 reset_id_ret = 0;
+ unsigned int ilen = sizeof(__le32);
+ int ret;
+
+ priv = ljca_priv(stub);
+ reset_id = cpu_to_le32(priv->reset_id++);
+ ret = ljca_stub_write(stub, LJCA_MNG_RESET_NOTIFY, &reset_id, sizeof(reset_id),
+ &reset_id_ret, &ilen, true, LJCA_USB_WRITE_ACK_TIMEOUT_MS);
+ if (ret)
+ return ret;
+
+ if (ilen != sizeof(reset_id_ret) || reset_id_ret != reset_id) {
+ dev_err(&stub->intf->dev, "mng reset notify failed reset_id:%u/%u\n",
+ le32_to_cpu(reset_id_ret), le32_to_cpu(reset_id));
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int ljca_add_mfd_cell(struct ljca_dev *dev, struct mfd_cell *cell)
+{
+ struct mfd_cell *new_cells;
+
+ new_cells = krealloc_array(dev->cells, dev->cell_count + 1, sizeof(*new_cells), GFP_KERNEL);
+ if (!new_cells)
+ return -ENOMEM;
+
+ memcpy(&new_cells[dev->cell_count], cell, sizeof(*cell));
+ dev->cells = new_cells;
+ dev->cell_count++;
+
+ return 0;
+}
+
+static int ljca_gpio_stub_init(struct ljca_dev *dev, struct ljca_gpio_descriptor *desc)
+{
+ u32 valid_pin[LJCA_MAX_GPIO_NUM / BITS_PER_TYPE(u32)];
+ struct ljca_gpio_info *gpio_info;
+ struct mfd_cell cell = {};
+ struct ljca_stub *stub;
+ int gpio_num;
+ int i;
+
+ gpio_num = desc->pins_per_bank * desc->bank_num;
+ if (gpio_num > LJCA_MAX_GPIO_NUM)
+ return -EINVAL;
+
+ stub = ljca_stub_alloc(dev, LJCA_GPIO_STUB, sizeof(*gpio_info));
+ if (IS_ERR(stub))
+ return PTR_ERR(stub);
+
+ gpio_info = ljca_priv(stub);
+ gpio_info->ljca = &stub->ljca;
+ gpio_info->num = gpio_num;
+
+ for (i = 0; i < desc->bank_num; i++)
+ valid_pin[i] = desc->bank_desc[i].valid_pins;
+
+ bitmap_from_arr32(gpio_info->valid_pin_map, valid_pin, gpio_num);
+
+ cell.name = "ljca-gpio";
+ cell.platform_data = gpio_info;
+ cell.pdata_size = sizeof(*gpio_info);
+ cell.acpi_match = &ljca_acpi_match_gpio;
+
+ return ljca_add_mfd_cell(dev, &cell);
+}
+
+static int ljca_mng_enum_gpio(struct ljca_stub *stub)
+{
+ struct ljca_dev *dev = usb_get_intfdata(stub->intf);
+ char buf[LJCA_MAX_PAYLOAD_SIZE];
+ struct ljca_gpio_descriptor *desc;
+ unsigned int len = LJCA_MAX_PAYLOAD_SIZE;
+ int ret;
+
+ ret = ljca_stub_write(stub, LJCA_MNG_ENUM_GPIO, NULL, 0, buf, &len, true,
+ LJCA_USB_ENUM_STUB_TIMEOUT_MS);
+ if (ret)
+ return ret;
+
+ desc = (struct ljca_gpio_descriptor *)buf;
+ if (len != struct_size(desc, bank_desc, desc->bank_num)) {
+ dev_err(&stub->intf->dev, "GPIO enumeration failed, len:%u bank_num:%u\n", len,
+ desc->bank_num);
+ return -EINVAL;
+ }
+
+ return ljca_gpio_stub_init(dev, desc);
+}
+
+static int ljca_i2c_stub_init(struct ljca_dev *dev, struct ljca_i2c_descriptor *desc)
+{
+ struct ljca_i2c_info *i2c_info;
+ struct ljca_stub *stub;
+ int ret;
+ int i;
+
+ stub = ljca_stub_alloc(dev, LJCA_I2C_STUB, size_mul(desc->num, sizeof(*i2c_info)));
+ if (IS_ERR(stub))
+ return PTR_ERR(stub);
+
+ i2c_info = ljca_priv(stub);
+
+ for (i = 0; i < desc->num; i++) {
+ struct mfd_cell cell = {};
+
+ i2c_info[i].ljca = &stub->ljca;
+ i2c_info[i].id = desc->info[i].id;
+ i2c_info[i].capacity = desc->info[i].capacity;
+ i2c_info[i].intr_pin = desc->info[i].intr_pin;
+
+ cell.name = "ljca-i2c";
+ cell.platform_data = &i2c_info[i];
+ cell.pdata_size = sizeof(i2c_info[i]);
+
+ if (i < ARRAY_SIZE(ljca_acpi_match_i2cs))
+ cell.acpi_match = &ljca_acpi_match_i2cs[i];
+
+ ret = ljca_add_mfd_cell(dev, &cell);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+static int ljca_mng_enum_i2c(struct ljca_stub *stub)
+{
+ struct ljca_dev *dev = usb_get_intfdata(stub->intf);
+ char buf[LJCA_MAX_PAYLOAD_SIZE];
+ struct ljca_i2c_descriptor *desc;
+ unsigned int len = LJCA_MAX_PAYLOAD_SIZE;
+ int ret;
+
+ ret = ljca_stub_write(stub, LJCA_MNG_ENUM_I2C, NULL, 0, buf, &len, true,
+ LJCA_USB_ENUM_STUB_TIMEOUT_MS);
+ if (ret) {
+ dev_err(&stub->intf->dev, "I2C enumeration failed, ret:%d len:%u\n", ret, len);
+ return ret;
+ }
+
+ desc = (struct ljca_i2c_descriptor *)buf;
+ return ljca_i2c_stub_init(dev, desc);
+}
+
+static int ljca_spi_stub_init(struct ljca_dev *dev, struct ljca_spi_descriptor *desc)
+{
+ struct ljca_spi_info *spi_info;
+ struct ljca_stub *stub;
+ int i;
+ int ret;
+
+ stub = ljca_stub_alloc(dev, LJCA_SPI_STUB, size_mul(desc->num, sizeof(*spi_info)));
+ if (IS_ERR(stub))
+ return PTR_ERR(stub);
+
+ spi_info = ljca_priv(stub);
+ for (i = 0; i < desc->num; i++) {
+ struct mfd_cell cell = {};
+
+ spi_info[i].ljca = &stub->ljca;
+ spi_info[i].id = desc->info[i].id;
+ spi_info[i].capacity = desc->info[i].capacity;
+
+ cell.name = "ljca-spi";
+ cell.platform_data = &spi_info[i];
+ cell.pdata_size = sizeof(spi_info[i]);
+ if (i < ARRAY_SIZE(ljca_acpi_match_spis))
+ cell.acpi_match = &ljca_acpi_match_spis[i];
+
+ ret = ljca_add_mfd_cell(dev, &cell);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+static int ljca_mng_enum_spi(struct ljca_stub *stub)
+{
+ struct ljca_dev *dev = usb_get_intfdata(stub->intf);
+ char buf[LJCA_MAX_PAYLOAD_SIZE];
+ struct ljca_spi_descriptor *desc;
+ unsigned int len = LJCA_MAX_PAYLOAD_SIZE;
+ int ret;
+
+ ret = ljca_stub_write(stub, LJCA_MNG_ENUM_SPI, NULL, 0, buf, &len, true,
+ LJCA_USB_ENUM_STUB_TIMEOUT_MS);
+ if (ret) {
+ dev_err(&stub->intf->dev, "SPI enumeration failed, ret:%d len:%d\n", ret, len);
+ return ret;
+ }
+
+ desc = (struct ljca_spi_descriptor *)buf;
+ return ljca_spi_stub_init(dev, desc);
+}
+
+static int ljca_mng_get_version(struct ljca_stub *stub, char *buf)
+{
+ struct fw_version version = {};
+ unsigned int len = sizeof(version);
+ int ret;
+
+ ret = ljca_stub_write(stub, LJCA_MNG_GET_VERSION, NULL, 0, &version, &len, true,
+ LJCA_USB_WRITE_ACK_TIMEOUT_MS);
+ if (ret)
+ return ret;
+
+ if (len != sizeof(version)) {
+ dev_err(&stub->intf->dev, "get version failed, len:%d\n", len);
+ return -EINVAL;
+ }
+
+ return sysfs_emit(buf, "%d.%d.%d.%d\n", version.major, version.minor,
+ le16_to_cpu(version.patch), le16_to_cpu(version.build));
+}
+
+static inline int ljca_mng_set_dfu_mode(struct ljca_stub *stub)
+{
+ return ljca_stub_write(stub, LJCA_MNG_SET_DFU_MODE, NULL, 0, NULL, NULL, true,
+ LJCA_USB_WRITE_ACK_TIMEOUT_MS);
+}
+
+static int ljca_mng_link(struct ljca_dev *dev, struct ljca_stub *stub)
+{
+ int ret;
+
+ ret = ljca_mng_reset_handshake(stub);
+ if (ret)
+ return ret;
+
+ /* try to enum all the stubs */
+ ljca_mng_enum_gpio(stub);
+ ljca_mng_enum_i2c(stub);
+ ljca_mng_enum_spi(stub);
+
+ return 0;
+}
+
+static int ljca_mng_init(struct ljca_dev *dev)
+{
+ struct ljca_stub *stub;
+ struct ljca_mng_priv *priv;
+ int ret;
+
+ stub = ljca_stub_alloc(dev, LJCA_MNG_STUB, sizeof(*priv));
+ if (IS_ERR(stub))
+ return PTR_ERR(stub);
+
+ priv = ljca_priv(stub);
+ if (!priv)
+ return -ENOMEM;
+
+ priv->reset_id = 0;
+
+ ret = ljca_mng_link(dev, stub);
+ if (ret)
+ dev_err(&dev->intf->dev, "mng stub link failed, ret:%d\n", ret);
+
+ return ret;
+}
+
+static inline int ljca_diag_set_trace_level(struct ljca_stub *stub, u8 level)
+{
+ return ljca_stub_write(stub, LJCA_DIAG_SET_TRACE_LEVEL, &level, sizeof(level), NULL, NULL,
+ true, LJCA_USB_WRITE_ACK_TIMEOUT_MS);
+}
+
+static int ljca_diag_init(struct ljca_dev *dev)
+{
+ struct ljca_stub *stub;
+
+ stub = ljca_stub_alloc(dev, LJCA_DIAG_STUB, 0);
+
+ return PTR_ERR_OR_ZERO(stub);
+}
+
+static void ljca_delete(struct ljca_dev *dev)
+{
+ mutex_destroy(&dev->mutex);
+ usb_free_urb(dev->in_urb);
+ usb_put_intf(dev->intf);
+ usb_put_dev(dev->udev);
+ kfree(dev->ibuf);
+ kfree(dev->cells);
+ kfree(dev);
+}
+
+static int ljca_init(struct ljca_dev *dev)
+{
+ mutex_init(&dev->mutex);
+ init_waitqueue_head(&dev->ack_wq);
+ INIT_LIST_HEAD(&dev->stubs_list);
+
+ return 0;
+}
+
+static void ljca_stop(struct ljca_dev *dev)
+{
+ dev->started = false;
+ usb_kill_urb(dev->in_urb);
+}
+
+static ssize_t cmd_store(struct device *dev, struct device_attribute *attr, const char *buf,
+ size_t count)
+{
+ struct usb_interface *intf = to_usb_interface(dev);
+ struct ljca_dev *ljca_dev = usb_get_intfdata(intf);
+ struct ljca_stub *mng_stub = ljca_stub_find(ljca_dev, LJCA_MNG_STUB);
+ struct ljca_stub *diag_stub = ljca_stub_find(ljca_dev, LJCA_DIAG_STUB);
+
+ if (sysfs_streq(buf, "dfu"))
+ ljca_mng_set_dfu_mode(mng_stub);
+ else if (sysfs_streq(buf, "debug"))
+ ljca_diag_set_trace_level(diag_stub, 3);
+
+ return count;
+}
+
+static ssize_t cmd_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+ return sysfs_emit(buf, "%s\n", "supported cmd: [dfu, debug]");
+}
+static DEVICE_ATTR_RW(cmd);
+
+static ssize_t version_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+ struct usb_interface *intf = to_usb_interface(dev);
+ struct ljca_dev *ljca_dev = usb_get_intfdata(intf);
+ struct ljca_stub *stub = ljca_stub_find(ljca_dev, LJCA_MNG_STUB);
+
+ return ljca_mng_get_version(stub, buf);
+}
+static DEVICE_ATTR_RO(version);
+
+static struct attribute *ljca_attrs[] = {
+ &dev_attr_version.attr,
+ &dev_attr_cmd.attr,
+ NULL
+};
+ATTRIBUTE_GROUPS(ljca);
+
+static int ljca_probe(struct usb_interface *intf, const struct usb_device_id *id)
+{
+ struct ljca_dev *dev;
+ struct usb_endpoint_descriptor *bulk_in, *bulk_out;
+ int ret;
+
+ /* allocate memory for our device state and initialize it */
+ dev = kzalloc(sizeof(*dev), GFP_KERNEL);
+ if (!dev)
+ return -ENOMEM;
+
+ ljca_init(dev);
+ dev->udev = usb_get_dev(interface_to_usbdev(intf));
+ dev->intf = usb_get_intf(intf);
+
+ /* set up the endpoint information use only the first bulk-in and bulk-out endpoints */
+ ret = usb_find_common_endpoints(intf->cur_altsetting, &bulk_in, &bulk_out, NULL, NULL);
+ if (ret) {
+ dev_err(&intf->dev, "could not find both bulk-in and bulk-out endpoints\n");
+ goto error;
+ }
+
+ dev->ibuf_len = usb_endpoint_maxp(bulk_in);
+ dev->in_ep = bulk_in->bEndpointAddress;
+ dev->ibuf = kzalloc(dev->ibuf_len, GFP_KERNEL);
+ if (!dev->ibuf) {
+ ret = -ENOMEM;
+ goto error;
+ }
+
+ dev->in_urb = usb_alloc_urb(0, GFP_KERNEL);
+ if (!dev->in_urb) {
+ ret = -ENOMEM;
+ goto error;
+ }
+
+ dev->out_ep = bulk_out->bEndpointAddress;
+ /* save our data pointer in this intf device */
+ usb_set_intfdata(intf, dev);
+ ret = ljca_start(dev);
+ if (ret) {
+ dev_err(&intf->dev, "bridge read start failed ret %d\n", ret);
+ goto error;
+ }
+
+ ret = ljca_mng_init(dev);
+ if (ret) {
+ dev_err(&intf->dev, "register mng stub failed ret %d\n", ret);
+ goto error_stop;
+ }
+
+ ret = ljca_diag_init(dev);
+ if (ret) {
+ dev_err(&intf->dev, "register diag stub failed ret %d\n", ret);
+ goto error_stop;
+ }
+
+ ret = mfd_add_hotplug_devices(&intf->dev, dev->cells, dev->cell_count);
+ if (ret) {
+ dev_err(&intf->dev, "failed to add mfd devices\n");
+ goto error_stop;
+ }
+
+ usb_enable_autosuspend(dev->udev);
+ return 0;
+error_stop:
+ ljca_stop(dev);
+error:
+ dev_err(&intf->dev, "LJCA USB device init failed\n");
+ /* this frees allocated memory */
+ ljca_stub_cleanup(dev);
+ ljca_delete(dev);
+ return ret;
+}
+
+static void ljca_disconnect(struct usb_interface *intf)
+{
+ struct ljca_dev *dev = usb_get_intfdata(intf);
+
+ ljca_stop(dev);
+ mfd_remove_devices(&intf->dev);
+ ljca_stub_cleanup(dev);
+ ljca_delete(dev);
+}
+
+static int ljca_suspend(struct usb_interface *intf, pm_message_t message)
+{
+ struct ljca_dev *dev = usb_get_intfdata(intf);
+
+ ljca_stop(dev);
+ return 0;
+}
+
+static int ljca_resume(struct usb_interface *intf)
+{
+ struct ljca_dev *dev = usb_get_intfdata(intf);
+
+ return ljca_start(dev);
+}
+
+static const struct usb_device_id ljca_table[] = {
+ {USB_DEVICE(0x8086, 0x0b63)},
+ {}
+};
+MODULE_DEVICE_TABLE(usb, ljca_table);
+
+static struct usb_driver ljca_driver = {
+ .name = "ljca",
+ .probe = ljca_probe,
+ .disconnect = ljca_disconnect,
+ .suspend = ljca_suspend,
+ .resume = ljca_resume,
+ .id_table = ljca_table,
+ .dev_groups = ljca_groups,
+ .supports_autosuspend = 1,
+};
+module_usb_driver(ljca_driver);
+
+MODULE_AUTHOR("Ye Xiang <xiang.ye@intel.com>");
+MODULE_AUTHOR("Wang Zhifeng <zhifeng.wang@intel.com>");
+MODULE_AUTHOR("Zhang Lixu <lixu.zhang@intel.com>");
+MODULE_DESCRIPTION("Intel La Jolla Cove Adapter USB driver");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/mfd/ljca.h b/include/linux/mfd/ljca.h
new file mode 100644
index 000000000000..9ae3ea242294
--- /dev/null
+++ b/include/linux/mfd/ljca.h
@@ -0,0 +1,95 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+#ifndef _LINUX_USB_LJCA_H_
+#define _LINUX_USB_LJCA_H_
+
+#include <linux/types.h>
+
+struct ljca;
+
+#define LJCA_MAX_GPIO_NUM 64
+struct ljca_gpio_info {
+ struct ljca *ljca;
+ unsigned int num;
+ DECLARE_BITMAP(valid_pin_map, LJCA_MAX_GPIO_NUM);
+};
+
+struct ljca_i2c_info {
+ struct ljca *ljca;
+ u8 id;
+ u8 capacity;
+ u8 intr_pin;
+};
+
+struct ljca_spi_info {
+ struct ljca *ljca;
+ u8 id;
+ u8 capacity;
+};
+
+/**
+ * typedef ljca_event_cb_t - event callback function signature
+ *
+ * @context: the execution context of who registered this callback
+ * @cmd: the command from device for this event
+ * @evt_data: the event data payload
+ * @len: the event data payload length
+ *
+ * The callback function is called in interrupt context and the data payload is
+ * only valid during the call. If the user needs later access of the data, it
+ * must copy it.
+ */
+typedef void (*ljca_event_cb_t)(void *context, u8 cmd, const void *evt_data, int len);
+
+/**
+ * ljca_register_event_cb - register a callback function to receive events
+ *
+ * @ljca: ljca device handle
+ * @event_cb: callback function
+ * @context: execution context of event callback
+ *
+ * Return: 0 in case of success, negative value in case of error
+ */
+int ljca_register_event_cb(struct ljca *ljca, ljca_event_cb_t event_cb, void *context);
+
+/**
+ * ljca_unregister_event_cb - unregister the callback function for an event
+ *
+ * @ljca: ljca device handle
+ */
+void ljca_unregister_event_cb(struct ljca *ljca);
+
+/**
+ * ljca_transfer - issue a LJCA command and wait for a response and the
+ * associated data
+ *
+ * @ljca: ljca device handle
+ * @cmd: the command to be sent to the device
+ * @obuf: the buffer to be sent to the device; it can be NULL if the user
+ * doesn't need to transmit data with this command
+ * @obuf_len: the size of the buffer to be sent to the device; it should
+ * be 0 when obuf is NULL
+ * @ibuf: any data associated with the response will be copied here; it can be
+ * NULL if the user doesn't need the response data
+ * @ibuf_len: must be initialized to the input buffer size; it will be modified
+ * to indicate the actual data transferred; it shouldn't be NULL as well
+ * when ibuf isn't NULL
+ *
+ * Return: 0 for success, negative value for errors
+ */
+int ljca_transfer(struct ljca *ljca, u8 cmd, const void *obuf, unsigned int obuf_len,
+ void *ibuf, unsigned int *ibuf_len);
+
+/**
+ * ljca_transfer_noack - issue a LJCA command without a response
+ *
+ * @ljca: ljca device handle
+ * @cmd: the command to be sent to the device
+ * @obuf: the buffer to be sent to the device; it can be NULL if the user
+ * doesn't need to transmit data with this command
+ * @obuf_len: the size of the buffer to be sent to the device
+ *
+ * Return: 0 for success, negative value for errors
+ */
+int ljca_transfer_noack(struct ljca *ljca, u8 cmd, const void *obuf, unsigned int obuf_len);
+
+#endif
--
2.34.1
^ permalink raw reply related [flat|nested] 9+ messages in thread
* [PATCH v2 2/5] gpio: Add support for Intel LJCA USB GPIO driver
2023-02-25 14:01 [PATCH v2 0/5] Add Intel LJCA device driver Ye Xiang
2023-02-25 14:01 ` [PATCH v2 1/5] mfd: Add support for Intel LJCA device Ye Xiang
@ 2023-02-25 14:01 ` Ye Xiang
2023-03-06 14:02 ` Linus Walleij
2023-02-25 14:01 ` [PATCH v2 3/5] i2c: Add support for Intel LJCA USB I2C driver Ye Xiang
` (2 subsequent siblings)
4 siblings, 1 reply; 9+ messages in thread
From: Ye Xiang @ 2023-02-25 14:01 UTC (permalink / raw
To: Lee Jones, Wolfram Sang, Tyrone Ting, Mark Brown, Linus Walleij,
Bartosz Golaszewski, linux-i2c, linux-kernel, linux-spi,
linux-gpio
Cc: srinivas.pandruvada, heikki.krogerus, andriy.shevchenko,
sakari.ailus, zhifeng.wang, wentong.wu, lixu.zhang, Ye Xiang
This patch implements the GPIO function of Intel USB-I2C/GPIO/SPI adapter
device named "La Jolla Cove Adapter" (LJCA). It communicate with LJCA
GPIO module with specific protocol through interfaces exported by LJCA USB
driver.
Signed-off-by: Ye Xiang <xiang.ye@intel.com>
---
drivers/gpio/Kconfig | 12 ++
drivers/gpio/Makefile | 1 +
drivers/gpio/gpio-ljca.c | 454 +++++++++++++++++++++++++++++++++++++++
3 files changed, 467 insertions(+)
create mode 100644 drivers/gpio/gpio-ljca.c
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index e9917a45b005..8332af1f5025 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -1257,6 +1257,18 @@ config GPIO_KEMPLD
This driver can also be built as a module. If so, the module will be
called gpio-kempld.
+config GPIO_LJCA
+ tristate "INTEL La Jolla Cove Adapter GPIO support"
+ depends on MFD_LJCA
+ select GPIOLIB_IRQCHIP
+ default MFD_LJCA
+ help
+ Select this option to enable GPIO driver for the INTEL
+ La Jolla Cove Adapter (LJCA) board.
+
+ This driver can also be built as a module. If so, the module
+ will be called gpio-ljca.
+
config GPIO_LP3943
tristate "TI/National Semiconductor LP3943 GPIO expander"
depends on MFD_LP3943
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 010587025fc8..4e2e2d44b820 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -78,6 +78,7 @@ obj-$(CONFIG_GPIO_IXP4XX) += gpio-ixp4xx.o
obj-$(CONFIG_GPIO_JANZ_TTL) += gpio-janz-ttl.o
obj-$(CONFIG_GPIO_KEMPLD) += gpio-kempld.o
obj-$(CONFIG_GPIO_LATCH) += gpio-latch.o
+obj-$(CONFIG_GPIO_LJCA) += gpio-ljca.o
obj-$(CONFIG_GPIO_LOGICVC) += gpio-logicvc.o
obj-$(CONFIG_GPIO_LOONGSON1) += gpio-loongson1.o
obj-$(CONFIG_GPIO_LOONGSON) += gpio-loongson.o
diff --git a/drivers/gpio/gpio-ljca.c b/drivers/gpio/gpio-ljca.c
new file mode 100644
index 000000000000..87863f0230f5
--- /dev/null
+++ b/drivers/gpio/gpio-ljca.c
@@ -0,0 +1,454 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Intel La Jolla Cove Adapter USB-GPIO driver
+ *
+ * Copyright (c) 2023, Intel Corporation.
+ */
+
+#include <linux/acpi.h>
+#include <linux/bitfield.h>
+#include <linux/bitops.h>
+#include <linux/dev_printk.h>
+#include <linux/gpio/driver.h>
+#include <linux/irq.h>
+#include <linux/kernel.h>
+#include <linux/kref.h>
+#include <linux/mfd/ljca.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+
+/* GPIO commands */
+#define LJCA_GPIO_CONFIG 1
+#define LJCA_GPIO_READ 2
+#define LJCA_GPIO_WRITE 3
+#define LJCA_GPIO_INT_EVENT 4
+#define LJCA_GPIO_INT_MASK 5
+#define LJCA_GPIO_INT_UNMASK 6
+
+#define LJCA_GPIO_CONF_DISABLE BIT(0)
+#define LJCA_GPIO_CONF_INPUT BIT(1)
+#define LJCA_GPIO_CONF_OUTPUT BIT(2)
+#define LJCA_GPIO_CONF_PULLUP BIT(3)
+#define LJCA_GPIO_CONF_PULLDOWN BIT(4)
+#define LJCA_GPIO_CONF_DEFAULT BIT(5)
+#define LJCA_GPIO_CONF_INTERRUPT BIT(6)
+#define LJCA_GPIO_INT_TYPE BIT(7)
+
+#define LJCA_GPIO_CONF_EDGE FIELD_PREP(LJCA_GPIO_INT_TYPE, 1)
+#define LJCA_GPIO_CONF_LEVEL FIELD_PREP(LJCA_GPIO_INT_TYPE, 0)
+
+/* Intentional overlap with PULLUP / PULLDOWN */
+#define LJCA_GPIO_CONF_SET BIT(3)
+#define LJCA_GPIO_CONF_CLR BIT(4)
+
+struct gpio_op {
+ u8 index;
+ u8 value;
+} __packed;
+
+struct gpio_packet {
+ u8 num;
+ struct gpio_op item[];
+} __packed;
+
+#define LJCA_GPIO_BUF_SIZE 60
+struct ljca_gpio_dev {
+ struct platform_device *pdev;
+ struct gpio_chip gc;
+ struct ljca_gpio_info *gpio_info;
+ DECLARE_BITMAP(unmasked_irqs, LJCA_MAX_GPIO_NUM);
+ DECLARE_BITMAP(enabled_irqs, LJCA_MAX_GPIO_NUM);
+ DECLARE_BITMAP(reenable_irqs, LJCA_MAX_GPIO_NUM);
+ u8 *connect_mode;
+ /* mutex to protect irq bus */
+ struct mutex irq_lock;
+ struct work_struct work;
+ /* lock to protect package transfer to Hardware */
+ struct mutex trans_lock;
+
+ u8 obuf[LJCA_GPIO_BUF_SIZE];
+ u8 ibuf[LJCA_GPIO_BUF_SIZE];
+};
+
+static int gpio_config(struct ljca_gpio_dev *ljca_gpio, u8 gpio_id, u8 config)
+{
+ struct gpio_packet *packet = (struct gpio_packet *)ljca_gpio->obuf;
+ int ret;
+
+ mutex_lock(&ljca_gpio->trans_lock);
+ packet->item[0].index = gpio_id;
+ packet->item[0].value = config | ljca_gpio->connect_mode[gpio_id];
+ packet->num = 1;
+
+ ret = ljca_transfer(ljca_gpio->gpio_info->ljca, LJCA_GPIO_CONFIG, packet,
+ struct_size(packet, item, packet->num), NULL, NULL);
+ mutex_unlock(&ljca_gpio->trans_lock);
+ return ret;
+}
+
+static int ljca_gpio_read(struct ljca_gpio_dev *ljca_gpio, u8 gpio_id)
+{
+ struct gpio_packet *packet = (struct gpio_packet *)ljca_gpio->obuf;
+ struct gpio_packet *ack_packet = (struct gpio_packet *)ljca_gpio->ibuf;
+ unsigned int ibuf_len = LJCA_GPIO_BUF_SIZE;
+ int ret;
+
+ mutex_lock(&ljca_gpio->trans_lock);
+ packet->num = 1;
+ packet->item[0].index = gpio_id;
+ ret = ljca_transfer(ljca_gpio->gpio_info->ljca, LJCA_GPIO_READ, packet,
+ struct_size(packet, item, packet->num), ljca_gpio->ibuf, &ibuf_len);
+ if (ret)
+ goto out_unlock;
+
+ if (!ibuf_len || ack_packet->num != packet->num) {
+ dev_err(&ljca_gpio->pdev->dev, "failed gpio_id:%u %u", gpio_id, ack_packet->num);
+ ret = -EIO;
+ }
+
+out_unlock:
+ mutex_unlock(&ljca_gpio->trans_lock);
+ if (ret)
+ return ret;
+ return ack_packet->item[0].value > 0;
+}
+
+static int ljca_gpio_write(struct ljca_gpio_dev *ljca_gpio, u8 gpio_id,
+ int value)
+{
+ struct gpio_packet *packet = (struct gpio_packet *)ljca_gpio->obuf;
+ int ret;
+
+ mutex_lock(&ljca_gpio->trans_lock);
+ packet->num = 1;
+ packet->item[0].index = gpio_id;
+ packet->item[0].value = value & 1;
+
+ ret = ljca_transfer(ljca_gpio->gpio_info->ljca, LJCA_GPIO_WRITE, packet,
+ struct_size(packet, item, packet->num), NULL, NULL);
+ mutex_unlock(&ljca_gpio->trans_lock);
+ return ret;
+}
+
+static int ljca_gpio_get_value(struct gpio_chip *chip, unsigned int offset)
+{
+ struct ljca_gpio_dev *ljca_gpio = gpiochip_get_data(chip);
+
+ return ljca_gpio_read(ljca_gpio, offset);
+}
+
+static void ljca_gpio_set_value(struct gpio_chip *chip, unsigned int offset,
+ int val)
+{
+ struct ljca_gpio_dev *ljca_gpio = gpiochip_get_data(chip);
+ int ret;
+
+ ret = ljca_gpio_write(ljca_gpio, offset, val);
+ if (ret)
+ dev_err(chip->parent, "offset:%u val:%d set value failed %d\n", offset, val, ret);
+}
+
+static int ljca_gpio_direction_input(struct gpio_chip *chip,
+ unsigned int offset)
+{
+ struct ljca_gpio_dev *ljca_gpio = gpiochip_get_data(chip);
+ u8 config = LJCA_GPIO_CONF_INPUT | LJCA_GPIO_CONF_CLR;
+
+ return gpio_config(ljca_gpio, offset, config);
+}
+
+static int ljca_gpio_direction_output(struct gpio_chip *chip,
+ unsigned int offset, int val)
+{
+ struct ljca_gpio_dev *ljca_gpio = gpiochip_get_data(chip);
+ u8 config = LJCA_GPIO_CONF_OUTPUT | LJCA_GPIO_CONF_CLR;
+ int ret;
+
+ ret = gpio_config(ljca_gpio, offset, config);
+ if (ret)
+ return ret;
+
+ ljca_gpio_set_value(chip, offset, val);
+ return 0;
+}
+
+static int ljca_gpio_set_config(struct gpio_chip *chip, unsigned int offset,
+ unsigned long config)
+{
+ struct ljca_gpio_dev *ljca_gpio = gpiochip_get_data(chip);
+
+ ljca_gpio->connect_mode[offset] = 0;
+ switch (pinconf_to_config_param(config)) {
+ case PIN_CONFIG_BIAS_PULL_UP:
+ ljca_gpio->connect_mode[offset] |= LJCA_GPIO_CONF_PULLUP;
+ break;
+ case PIN_CONFIG_BIAS_PULL_DOWN:
+ ljca_gpio->connect_mode[offset] |= LJCA_GPIO_CONF_PULLDOWN;
+ break;
+ case PIN_CONFIG_DRIVE_PUSH_PULL:
+ case PIN_CONFIG_PERSIST_STATE:
+ break;
+ default:
+ return -ENOTSUPP;
+ }
+
+ return 0;
+}
+
+static int ljca_gpio_init_valid_mask(struct gpio_chip *chip, unsigned long *valid_mask,
+ unsigned int ngpios)
+{
+ struct ljca_gpio_dev *ljca_gpio = gpiochip_get_data(chip);
+
+ WARN_ON_ONCE(ngpios != ljca_gpio->gpio_info->num);
+ bitmap_copy(valid_mask, ljca_gpio->gpio_info->valid_pin_map, ngpios);
+
+ return 0;
+}
+
+static void ljca_gpio_irq_init_valid_mask(struct gpio_chip *chip, unsigned long *valid_mask,
+ unsigned int ngpios)
+{
+ ljca_gpio_init_valid_mask(chip, valid_mask, ngpios);
+}
+
+static int ljca_enable_irq(struct ljca_gpio_dev *ljca_gpio, int gpio_id, bool enable)
+{
+ struct gpio_packet *packet = (struct gpio_packet *)ljca_gpio->obuf;
+ int ret;
+
+ mutex_lock(&ljca_gpio->trans_lock);
+ packet->num = 1;
+ packet->item[0].index = gpio_id;
+ packet->item[0].value = 0;
+
+ ret = ljca_transfer(ljca_gpio->gpio_info->ljca,
+ enable ? LJCA_GPIO_INT_UNMASK : LJCA_GPIO_INT_MASK, packet,
+ struct_size(packet, item, packet->num), NULL, NULL);
+ mutex_unlock(&ljca_gpio->trans_lock);
+ return ret;
+}
+
+static void ljca_gpio_async(struct work_struct *work)
+{
+ struct ljca_gpio_dev *ljca_gpio = container_of(work, struct ljca_gpio_dev, work);
+ int gpio_id;
+ int unmasked;
+
+ for_each_set_bit(gpio_id, ljca_gpio->reenable_irqs, ljca_gpio->gc.ngpio) {
+ clear_bit(gpio_id, ljca_gpio->reenable_irqs);
+ unmasked = test_bit(gpio_id, ljca_gpio->unmasked_irqs);
+ if (unmasked)
+ ljca_enable_irq(ljca_gpio, gpio_id, true);
+ }
+}
+
+static void ljca_gpio_event_cb(void *context, u8 cmd, const void *evt_data, int len)
+{
+ const struct gpio_packet *packet = evt_data;
+ struct ljca_gpio_dev *ljca_gpio = context;
+ int i;
+ int irq;
+
+ if (cmd != LJCA_GPIO_INT_EVENT)
+ return;
+
+ for (i = 0; i < packet->num; i++) {
+ irq = irq_find_mapping(ljca_gpio->gc.irq.domain, packet->item[i].index);
+ if (!irq) {
+ dev_err(ljca_gpio->gc.parent, "gpio_id %u does not mapped to IRQ yet\n",
+ packet->item[i].index);
+ return;
+ }
+
+ generic_handle_domain_irq(ljca_gpio->gc.irq.domain, irq);
+ set_bit(packet->item[i].index, ljca_gpio->reenable_irqs);
+ }
+
+ schedule_work(&ljca_gpio->work);
+}
+
+static void ljca_irq_unmask(struct irq_data *irqd)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(irqd);
+ struct ljca_gpio_dev *ljca_gpio = gpiochip_get_data(gc);
+ int gpio_id = irqd_to_hwirq(irqd);
+
+ gpiochip_enable_irq(gc, gpio_id);
+ set_bit(gpio_id, ljca_gpio->unmasked_irqs);
+}
+
+static void ljca_irq_mask(struct irq_data *irqd)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(irqd);
+ struct ljca_gpio_dev *ljca_gpio = gpiochip_get_data(gc);
+ int gpio_id = irqd_to_hwirq(irqd);
+
+ clear_bit(gpio_id, ljca_gpio->unmasked_irqs);
+ gpiochip_disable_irq(gc, gpio_id);
+}
+
+static int ljca_irq_set_type(struct irq_data *irqd, unsigned int type)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(irqd);
+ struct ljca_gpio_dev *ljca_gpio = gpiochip_get_data(gc);
+ int gpio_id = irqd_to_hwirq(irqd);
+
+ ljca_gpio->connect_mode[gpio_id] = LJCA_GPIO_CONF_INTERRUPT;
+ switch (type) {
+ case IRQ_TYPE_LEVEL_HIGH:
+ ljca_gpio->connect_mode[gpio_id] |= (LJCA_GPIO_CONF_LEVEL | LJCA_GPIO_CONF_PULLUP);
+ break;
+ case IRQ_TYPE_LEVEL_LOW:
+ ljca_gpio->connect_mode[gpio_id] |= (LJCA_GPIO_CONF_LEVEL | LJCA_GPIO_CONF_PULLDOWN);
+ break;
+ case IRQ_TYPE_EDGE_BOTH:
+ break;
+ case IRQ_TYPE_EDGE_RISING:
+ ljca_gpio->connect_mode[gpio_id] |= (LJCA_GPIO_CONF_EDGE | LJCA_GPIO_CONF_PULLUP);
+ break;
+ case IRQ_TYPE_EDGE_FALLING:
+ ljca_gpio->connect_mode[gpio_id] |= (LJCA_GPIO_CONF_EDGE | LJCA_GPIO_CONF_PULLDOWN);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static void ljca_irq_bus_lock(struct irq_data *irqd)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(irqd);
+ struct ljca_gpio_dev *ljca_gpio = gpiochip_get_data(gc);
+
+ mutex_lock(&ljca_gpio->irq_lock);
+}
+
+static void ljca_irq_bus_unlock(struct irq_data *irqd)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(irqd);
+ struct ljca_gpio_dev *ljca_gpio = gpiochip_get_data(gc);
+ int gpio_id = irqd_to_hwirq(irqd);
+ int enabled;
+ int unmasked;
+
+ enabled = test_bit(gpio_id, ljca_gpio->enabled_irqs);
+ unmasked = test_bit(gpio_id, ljca_gpio->unmasked_irqs);
+
+ if (enabled != unmasked) {
+ if (unmasked) {
+ gpio_config(ljca_gpio, gpio_id, 0);
+ ljca_enable_irq(ljca_gpio, gpio_id, true);
+ set_bit(gpio_id, ljca_gpio->enabled_irqs);
+ } else {
+ ljca_enable_irq(ljca_gpio, gpio_id, false);
+ clear_bit(gpio_id, ljca_gpio->enabled_irqs);
+ }
+ }
+
+ mutex_unlock(&ljca_gpio->irq_lock);
+}
+
+static const struct irq_chip ljca_gpio_irqchip = {
+ .name = "ljca-irq",
+ .irq_mask = ljca_irq_mask,
+ .irq_unmask = ljca_irq_unmask,
+ .irq_set_type = ljca_irq_set_type,
+ .irq_bus_lock = ljca_irq_bus_lock,
+ .irq_bus_sync_unlock = ljca_irq_bus_unlock,
+ .flags = IRQCHIP_IMMUTABLE,
+ GPIOCHIP_IRQ_RESOURCE_HELPERS,
+};
+
+static int ljca_gpio_probe(struct platform_device *pdev)
+{
+ struct ljca_gpio_dev *ljca_gpio;
+ struct gpio_irq_chip *girq;
+ int ret;
+
+ ljca_gpio = devm_kzalloc(&pdev->dev, sizeof(*ljca_gpio), GFP_KERNEL);
+ if (!ljca_gpio)
+ return -ENOMEM;
+
+ ljca_gpio->gpio_info = dev_get_platdata(&pdev->dev);
+ ljca_gpio->connect_mode = devm_kcalloc(&pdev->dev, ljca_gpio->gpio_info->num,
+ sizeof(*ljca_gpio->connect_mode), GFP_KERNEL);
+ if (!ljca_gpio->connect_mode)
+ return -ENOMEM;
+
+ mutex_init(&ljca_gpio->irq_lock);
+ mutex_init(&ljca_gpio->trans_lock);
+ ljca_gpio->pdev = pdev;
+ ljca_gpio->gc.direction_input = ljca_gpio_direction_input;
+ ljca_gpio->gc.direction_output = ljca_gpio_direction_output;
+ ljca_gpio->gc.get = ljca_gpio_get_value;
+ ljca_gpio->gc.set = ljca_gpio_set_value;
+ ljca_gpio->gc.set_config = ljca_gpio_set_config;
+ ljca_gpio->gc.init_valid_mask = ljca_gpio_init_valid_mask;
+ ljca_gpio->gc.can_sleep = true;
+ ljca_gpio->gc.parent = &pdev->dev;
+
+ ljca_gpio->gc.base = -1;
+ ljca_gpio->gc.ngpio = ljca_gpio->gpio_info->num;
+ ljca_gpio->gc.label = ACPI_COMPANION(&pdev->dev) ?
+ acpi_dev_name(ACPI_COMPANION(&pdev->dev)) :
+ dev_name(&pdev->dev);
+ ljca_gpio->gc.owner = THIS_MODULE;
+
+ platform_set_drvdata(pdev, ljca_gpio);
+ ljca_register_event_cb(ljca_gpio->gpio_info->ljca, ljca_gpio_event_cb, ljca_gpio);
+
+ girq = &ljca_gpio->gc.irq;
+ gpio_irq_chip_set_chip(girq, &ljca_gpio_irqchip);
+ girq->parent_handler = NULL;
+ girq->num_parents = 0;
+ girq->parents = NULL;
+ girq->default_type = IRQ_TYPE_NONE;
+ girq->handler = handle_simple_irq;
+ girq->init_valid_mask = ljca_gpio_irq_init_valid_mask;
+
+ INIT_WORK(&ljca_gpio->work, ljca_gpio_async);
+ ret = gpiochip_add_data(&ljca_gpio->gc, ljca_gpio);
+ if (ret) {
+ ljca_unregister_event_cb(ljca_gpio->gpio_info->ljca);
+ mutex_destroy(&ljca_gpio->irq_lock);
+ mutex_destroy(&ljca_gpio->trans_lock);
+ }
+
+ return ret;
+}
+
+static int ljca_gpio_remove(struct platform_device *pdev)
+{
+ struct ljca_gpio_dev *ljca_gpio = platform_get_drvdata(pdev);
+
+ gpiochip_remove(&ljca_gpio->gc);
+ ljca_unregister_event_cb(ljca_gpio->gpio_info->ljca);
+ mutex_destroy(&ljca_gpio->irq_lock);
+ mutex_destroy(&ljca_gpio->trans_lock);
+ return 0;
+}
+
+#define LJCA_GPIO_DRV_NAME "ljca-gpio"
+static const struct platform_device_id ljca_gpio_id[] = {
+ { LJCA_GPIO_DRV_NAME, 0 },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(platform, ljca_gpio_id);
+
+static struct platform_driver ljca_gpio_driver = {
+ .driver.name = LJCA_GPIO_DRV_NAME,
+ .probe = ljca_gpio_probe,
+ .remove = ljca_gpio_remove,
+};
+module_platform_driver(ljca_gpio_driver);
+
+MODULE_AUTHOR("Ye Xiang <xiang.ye@intel.com>");
+MODULE_AUTHOR("Wang Zhifeng <zhifeng.wang@intel.com>");
+MODULE_AUTHOR("Zhang Lixu <lixu.zhang@intel.com>");
+MODULE_DESCRIPTION("Intel La Jolla Cove Adapter USB-GPIO driver");
+MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS(LJCA);
--
2.34.1
^ permalink raw reply related [flat|nested] 9+ messages in thread
* [PATCH v2 3/5] i2c: Add support for Intel LJCA USB I2C driver
2023-02-25 14:01 [PATCH v2 0/5] Add Intel LJCA device driver Ye Xiang
2023-02-25 14:01 ` [PATCH v2 1/5] mfd: Add support for Intel LJCA device Ye Xiang
2023-02-25 14:01 ` [PATCH v2 2/5] gpio: Add support for Intel LJCA USB GPIO driver Ye Xiang
@ 2023-02-25 14:01 ` Ye Xiang
2023-02-25 14:01 ` [PATCH v2 4/5] spi: Add support for Intel LJCA USB SPI driver Ye Xiang
2023-02-25 14:01 ` [PATCH v2 5/5] Documentation: Add ABI doc for attributes of LJCA device Ye Xiang
4 siblings, 0 replies; 9+ messages in thread
From: Ye Xiang @ 2023-02-25 14:01 UTC (permalink / raw
To: Lee Jones, Wolfram Sang, Tyrone Ting, Mark Brown, Linus Walleij,
Bartosz Golaszewski, linux-i2c, linux-kernel, linux-spi,
linux-gpio
Cc: srinivas.pandruvada, heikki.krogerus, andriy.shevchenko,
sakari.ailus, zhifeng.wang, wentong.wu, lixu.zhang, Ye Xiang
This patch implements the I2C function of Intel USB-I2C/GPIO/SPI adapter
device named "La Jolla Cove Adapter" (LJCA). It communicate with LJCA
I2c module with specific protocol through interfaces exported by LJCA USB
driver.
Signed-off-by: Ye Xiang <xiang.ye@intel.com>
---
drivers/i2c/busses/Kconfig | 11 ++
drivers/i2c/busses/Makefile | 1 +
drivers/i2c/busses/i2c-ljca.c | 357 ++++++++++++++++++++++++++++++++++
3 files changed, 369 insertions(+)
create mode 100644 drivers/i2c/busses/i2c-ljca.c
diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index a7bfddf08fa7..f94e2ed32563 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -1243,6 +1243,17 @@ config I2C_DLN2
This driver can also be built as a module. If so, the module
will be called i2c-dln2.
+config I2C_LJCA
+ tristate "I2C functionality of Intel La Jolla Cove Adapter"
+ depends on MFD_LJCA
+ default MFD_LJCA
+ help
+ If you say yes to this option, I2C functionality support of Intel
+ La Jolla Cove Adapter (LJCA) will be included.
+
+ This driver can also be built as a module. If so, the module
+ will be called i2c-ljca.
+
config I2C_CP2615
tristate "Silicon Labs CP2615 USB sound card and I2C adapter"
depends on USB
diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
index e73cdb1d2b5a..66a1fe79d0f6 100644
--- a/drivers/i2c/busses/Makefile
+++ b/drivers/i2c/busses/Makefile
@@ -131,6 +131,7 @@ obj-$(CONFIG_I2C_RCAR) += i2c-rcar.o
# External I2C/SMBus adapter drivers
obj-$(CONFIG_I2C_DIOLAN_U2C) += i2c-diolan-u2c.o
obj-$(CONFIG_I2C_DLN2) += i2c-dln2.o
+obj-$(CONFIG_I2C_LJCA) += i2c-ljca.o
obj-$(CONFIG_I2C_CP2615) += i2c-cp2615.o
obj-$(CONFIG_I2C_PARPORT) += i2c-parport.o
obj-$(CONFIG_I2C_PCI1XXXX) += i2c-mchp-pci1xxxx.o
diff --git a/drivers/i2c/busses/i2c-ljca.c b/drivers/i2c/busses/i2c-ljca.c
new file mode 100644
index 000000000000..3250297c15b8
--- /dev/null
+++ b/drivers/i2c/busses/i2c-ljca.c
@@ -0,0 +1,357 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Intel La Jolla Cove Adapter USB-I2C driver
+ *
+ * Copyright (c) 2023, Intel Corporation.
+ */
+
+#include <linux/bitfield.h>
+#include <linux/bits.h>
+#include <linux/dev_printk.h>
+#include <linux/i2c.h>
+#include <linux/mfd/ljca.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+
+/* I2C commands */
+enum ljca_i2c_cmd {
+ LJCA_I2C_INIT = 1,
+ LJCA_I2C_XFER,
+ LJCA_I2C_START,
+ LJCA_I2C_STOP,
+ LJCA_I2C_READ,
+ LJCA_I2C_WRITE,
+};
+
+enum ljca_xfer_type {
+ LJCA_I2C_READ_XFER_TYPE,
+ LJCA_I2C_WRITE_XFER_TYPE,
+};
+
+/* I2C r/w Flags */
+#define LJCA_I2C_SLAVE_TRANSFER_WRITE (0)
+#define LJCA_I2C_SLAVE_TRANSFER_READ (1)
+
+/* I2C init flags */
+#define LJCA_I2C_INIT_FLAG_MODE BIT(0)
+#define LJCA_I2C_INIT_FLAG_MODE_POLLING FIELD_PREP(LJCA_I2C_INIT_FLAG_MODE, 0)
+#define LJCA_I2C_INIT_FLAG_MODE_INTERRUPT FIELD_PREP(LJCA_I2C_INIT_FLAG_MODE, 1)
+
+#define LJCA_I2C_INIT_FLAG_ADDR_16BIT BIT(0)
+
+#define LJCA_I2C_INIT_FLAG_FREQ GENMASK(2, 1)
+#define LJCA_I2C_INIT_FLAG_FREQ_100K FIELD_PREP(LJCA_I2C_INIT_FLAG_FREQ, 0)
+#define LJCA_I2C_INIT_FLAG_FREQ_400K FIELD_PREP(LJCA_I2C_INIT_FLAG_FREQ, 1)
+#define LJCA_I2C_INIT_FLAG_FREQ_1M FIELD_PREP(LJCA_I2C_INIT_FLAG_FREQ, 2)
+
+/* I2C Transfer */
+struct i2c_xfer {
+ u8 id;
+ u8 slave;
+ u16 flag; /* speed, 8/16bit addr, addr increase, etc */
+ u16 addr;
+ u16 len;
+ u8 data[];
+} __packed;
+
+/* I2C raw commands: Init/Start/Read/Write/Stop */
+struct i2c_rw_packet {
+ u8 id;
+ __le16 len;
+ u8 data[];
+} __packed;
+
+#define LJCA_I2C_BUF_SIZE 60
+#define LJCA_I2C_MAX_XFER_SIZE (LJCA_I2C_BUF_SIZE - sizeof(struct i2c_rw_packet))
+
+struct ljca_i2c_dev {
+ struct platform_device *pdev;
+ struct ljca_i2c_info *i2c_info;
+ struct i2c_adapter adap;
+
+ u8 obuf[LJCA_I2C_BUF_SIZE];
+ u8 ibuf[LJCA_I2C_BUF_SIZE];
+};
+
+static u8 ljca_i2c_format_slave_addr(u8 slave_addr, u8 type)
+{
+ return (slave_addr << 1) | (type == LJCA_I2C_READ_XFER_TYPE) ?
+ LJCA_I2C_SLAVE_TRANSFER_READ :
+ LJCA_I2C_SLAVE_TRANSFER_WRITE;
+}
+
+static int ljca_i2c_init(struct ljca_i2c_dev *ljca_i2c, u8 id)
+{
+ struct i2c_rw_packet *w_packet = (struct i2c_rw_packet *)ljca_i2c->obuf;
+
+ memset(w_packet, 0, sizeof(*w_packet));
+ w_packet->id = id;
+ w_packet->data[0] = LJCA_I2C_INIT_FLAG_FREQ_400K;
+ w_packet->len = cpu_to_le16(sizeof(*w_packet->data));
+
+ return ljca_transfer(ljca_i2c->i2c_info->ljca, LJCA_I2C_INIT, w_packet,
+ struct_size(w_packet, data, 1), NULL, NULL);
+}
+
+static int ljca_i2c_start(struct ljca_i2c_dev *ljca_i2c, u8 slave_addr, enum ljca_xfer_type type)
+{
+ struct i2c_rw_packet *w_packet = (struct i2c_rw_packet *)ljca_i2c->obuf;
+ struct i2c_rw_packet *r_packet = (struct i2c_rw_packet *)ljca_i2c->ibuf;
+ unsigned int ibuf_len = LJCA_I2C_BUF_SIZE;
+ int ret;
+ s16 rp_len;
+
+ memset(w_packet, 0, sizeof(*w_packet));
+ w_packet->id = ljca_i2c->i2c_info->id;
+ w_packet->data[0] = ljca_i2c_format_slave_addr(slave_addr, type);
+ w_packet->len = cpu_to_le16(sizeof(*w_packet->data));
+
+ ret = ljca_transfer(ljca_i2c->i2c_info->ljca, LJCA_I2C_START, w_packet,
+ struct_size(w_packet, data, 1), r_packet, &ibuf_len);
+ if (ret)
+ return ret;
+
+ if (ibuf_len < sizeof(*r_packet))
+ return -EIO;
+
+ rp_len = le16_to_cpu(r_packet->len);
+ if (rp_len < 0 || r_packet->id != w_packet->id) {
+ dev_err(&ljca_i2c->adap.dev, "i2c start failed len:%d id:%d %d\n", rp_len,
+ r_packet->id, w_packet->id);
+ return -EIO;
+ }
+
+ return 0;
+}
+
+static int ljca_i2c_stop(struct ljca_i2c_dev *ljca_i2c, u8 slave_addr)
+{
+ struct i2c_rw_packet *w_packet = (struct i2c_rw_packet *)ljca_i2c->obuf;
+ struct i2c_rw_packet *r_packet = (struct i2c_rw_packet *)ljca_i2c->ibuf;
+ unsigned int ibuf_len = LJCA_I2C_BUF_SIZE;
+ int ret;
+ s16 rp_len;
+
+ memset(w_packet, 0, sizeof(*w_packet));
+ w_packet->id = ljca_i2c->i2c_info->id;
+ w_packet->data[0] = 0;
+ w_packet->len = cpu_to_le16(sizeof(*w_packet->data));
+
+ ret = ljca_transfer(ljca_i2c->i2c_info->ljca, LJCA_I2C_STOP, w_packet,
+ struct_size(w_packet, data, 1), r_packet, &ibuf_len);
+ if (ret)
+ return ret;
+
+ if (ibuf_len < sizeof(*r_packet))
+ return -EIO;
+
+ rp_len = le16_to_cpu(r_packet->len);
+ if (rp_len < 0 || r_packet->id != w_packet->id) {
+ dev_err(&ljca_i2c->adap.dev, "i2c stop failed len:%d id:%d %d\n", rp_len,
+ r_packet->id, w_packet->id);
+ return -EIO;
+ }
+
+ return 0;
+}
+
+static int ljca_i2c_pure_read(struct ljca_i2c_dev *ljca_i2c, u8 *data, u8 len)
+{
+ struct i2c_rw_packet *w_packet = (struct i2c_rw_packet *)ljca_i2c->obuf;
+ struct i2c_rw_packet *r_packet = (struct i2c_rw_packet *)ljca_i2c->ibuf;
+ unsigned int ibuf_len = LJCA_I2C_BUF_SIZE;
+ int ret;
+ s16 rp_len;
+
+ if (len > LJCA_I2C_MAX_XFER_SIZE)
+ return -EINVAL;
+
+ memset(w_packet, 0, sizeof(*w_packet));
+ w_packet->id = ljca_i2c->i2c_info->id;
+ w_packet->len = cpu_to_le16(len);
+ w_packet->data[0] = 0;
+
+ ret = ljca_transfer(ljca_i2c->i2c_info->ljca, LJCA_I2C_READ, w_packet,
+ struct_size(w_packet, data, 1), r_packet, &ibuf_len);
+ if (ret)
+ return ret;
+
+ if (ibuf_len < sizeof(*r_packet))
+ return -EIO;
+
+ rp_len = le16_to_cpu(r_packet->len);
+ if (rp_len != len || r_packet->id != w_packet->id) {
+ dev_err(&ljca_i2c->adap.dev, "i2c raw read failed len:%d id:%d %d\n", rp_len,
+ r_packet->id, w_packet->id);
+ return -EIO;
+ }
+
+ memcpy(data, r_packet->data, len);
+
+ return 0;
+}
+
+static int ljca_i2c_read(struct ljca_i2c_dev *ljca_i2c, u8 slave_addr, u8 *data,
+ u8 len)
+{
+ int ret;
+
+ ret = ljca_i2c_start(ljca_i2c, slave_addr, LJCA_I2C_READ_XFER_TYPE);
+ if (ret)
+ goto out_stop;
+
+ ret = ljca_i2c_pure_read(ljca_i2c, data, len);
+
+out_stop:
+ ljca_i2c_stop(ljca_i2c, slave_addr);
+ return ret;
+}
+
+static int ljca_i2c_pure_write(struct ljca_i2c_dev *ljca_i2c, u8 *data, u8 len)
+{
+ struct i2c_rw_packet *w_packet = (struct i2c_rw_packet *)ljca_i2c->obuf;
+ struct i2c_rw_packet *r_packet = (struct i2c_rw_packet *)ljca_i2c->ibuf;
+ unsigned int ibuf_len = LJCA_I2C_BUF_SIZE;
+ s16 rplen;
+ int ret;
+
+ if (len > LJCA_I2C_MAX_XFER_SIZE)
+ return -EINVAL;
+
+ memset(w_packet, 0, sizeof(*w_packet));
+ w_packet->id = ljca_i2c->i2c_info->id;
+ w_packet->len = cpu_to_le16(len);
+ memcpy(w_packet->data, data, len);
+
+ ret = ljca_transfer(ljca_i2c->i2c_info->ljca, LJCA_I2C_WRITE, w_packet,
+ struct_size(w_packet, data, len), r_packet, &ibuf_len);
+ if (ret)
+ return ret;
+
+ if (ibuf_len < sizeof(*r_packet))
+ return -EIO;
+
+ rplen = le16_to_cpu(r_packet->len);
+ if (rplen != len || r_packet->id != w_packet->id) {
+ dev_err(&ljca_i2c->adap.dev, "i2c write failed len:%d id:%d/%d\n", rplen,
+ r_packet->id, w_packet->id);
+ return -EIO;
+ }
+
+ return 0;
+}
+
+static int ljca_i2c_write(struct ljca_i2c_dev *ljca_i2c, u8 slave_addr, u8 *data, u8 len)
+{
+ int ret;
+
+ if (!data)
+ return -EINVAL;
+
+ ret = ljca_i2c_start(ljca_i2c, slave_addr, LJCA_I2C_WRITE_XFER_TYPE);
+ if (ret)
+ goto out_stop;
+
+ ret = ljca_i2c_pure_write(ljca_i2c, data, len);
+
+out_stop:
+ ljca_i2c_stop(ljca_i2c, slave_addr);
+ return ret;
+}
+
+static int ljca_i2c_xfer(struct i2c_adapter *adapter, struct i2c_msg *msg, int num)
+{
+ struct ljca_i2c_dev *ljca_i2c;
+ struct i2c_msg *cur_msg;
+ int i, ret;
+
+ ljca_i2c = i2c_get_adapdata(adapter);
+ if (!ljca_i2c)
+ return -EINVAL;
+
+ for (i = 0; i < num; i++) {
+ cur_msg = &msg[i];
+ if (cur_msg->flags & I2C_M_RD)
+ ret = ljca_i2c_read(ljca_i2c, cur_msg->addr, cur_msg->buf, cur_msg->len);
+ else
+ ret = ljca_i2c_write(ljca_i2c, cur_msg->addr, cur_msg->buf, cur_msg->len);
+
+ if (ret)
+ return ret;
+ }
+
+ return num;
+}
+
+static u32 ljca_i2c_func(struct i2c_adapter *adap)
+{
+ return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
+}
+
+static const struct i2c_adapter_quirks ljca_i2c_quirks = {
+ .max_read_len = LJCA_I2C_MAX_XFER_SIZE,
+ .max_write_len = LJCA_I2C_MAX_XFER_SIZE,
+};
+
+static const struct i2c_algorithm ljca_i2c_algo = {
+ .master_xfer = ljca_i2c_xfer,
+ .functionality = ljca_i2c_func,
+};
+
+static int ljca_i2c_probe(struct platform_device *pdev)
+{
+ struct ljca_i2c_dev *ljca_i2c;
+ int ret;
+
+ ljca_i2c = devm_kzalloc(&pdev->dev, sizeof(*ljca_i2c), GFP_KERNEL);
+ if (!ljca_i2c)
+ return -ENOMEM;
+
+ ljca_i2c->pdev = pdev;
+ ljca_i2c->i2c_info = dev_get_platdata(&pdev->dev);
+ ljca_i2c->adap.owner = THIS_MODULE;
+ ljca_i2c->adap.class = I2C_CLASS_HWMON;
+ ljca_i2c->adap.algo = &ljca_i2c_algo;
+ ljca_i2c->adap.quirks = &ljca_i2c_quirks;
+ ljca_i2c->adap.dev.parent = &pdev->dev;
+ device_set_node(&ljca_i2c->adap.dev, dev_fwnode(&pdev->dev));
+ i2c_set_adapdata(&ljca_i2c->adap, ljca_i2c);
+ snprintf(ljca_i2c->adap.name, sizeof(ljca_i2c->adap.name), "%s-%s-%d",
+ dev_name(&pdev->dev), dev_name(pdev->dev.parent),
+ ljca_i2c->i2c_info->id);
+
+ platform_set_drvdata(pdev, ljca_i2c);
+
+ ret = ljca_i2c_init(ljca_i2c, ljca_i2c->i2c_info->id);
+ if (ret) {
+ dev_err(&pdev->dev, "i2c init failed id:%d\n", ljca_i2c->i2c_info->id);
+ return -EIO;
+ }
+
+ ret = devm_i2c_add_adapter(&pdev->dev, &ljca_i2c->adap);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+#define LJCA_I2C_DRV_NAME "ljca-i2c"
+static const struct platform_device_id ljca_i2c_id[] = {
+ { LJCA_I2C_DRV_NAME, 0 },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(platform, ljca_i2c_id);
+
+static struct platform_driver ljca_i2c_driver = {
+ .driver.name = LJCA_I2C_DRV_NAME,
+ .probe = ljca_i2c_probe,
+};
+
+module_platform_driver(ljca_i2c_driver);
+
+MODULE_AUTHOR("Ye Xiang <xiang.ye@intel.com>");
+MODULE_AUTHOR("Wang Zhifeng <zhifeng.wang@intel.com>");
+MODULE_AUTHOR("Zhang Lixu <lixu.zhang@intel.com>");
+MODULE_DESCRIPTION("Intel La Jolla Cove Adapter USB-I2C driver");
+MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS(LJCA);
--
2.34.1
^ permalink raw reply related [flat|nested] 9+ messages in thread
* [PATCH v2 4/5] spi: Add support for Intel LJCA USB SPI driver
2023-02-25 14:01 [PATCH v2 0/5] Add Intel LJCA device driver Ye Xiang
` (2 preceding siblings ...)
2023-02-25 14:01 ` [PATCH v2 3/5] i2c: Add support for Intel LJCA USB I2C driver Ye Xiang
@ 2023-02-25 14:01 ` Ye Xiang
2023-02-27 17:23 ` Mark Brown
2023-02-25 14:01 ` [PATCH v2 5/5] Documentation: Add ABI doc for attributes of LJCA device Ye Xiang
4 siblings, 1 reply; 9+ messages in thread
From: Ye Xiang @ 2023-02-25 14:01 UTC (permalink / raw
To: Lee Jones, Wolfram Sang, Tyrone Ting, Mark Brown, Linus Walleij,
Bartosz Golaszewski, linux-i2c, linux-kernel, linux-spi,
linux-gpio
Cc: srinivas.pandruvada, heikki.krogerus, andriy.shevchenko,
sakari.ailus, zhifeng.wang, wentong.wu, lixu.zhang, Ye Xiang
This patch implements the SPI function of Intel USB-I2C/GPIO/SPI adapter
device named "La Jolla Cove Adapter" (LJCA). It communicate with LJCA
SPI module with specific protocol through interfaces exported by LJCA USB
driver.
Signed-off-by: Ye Xiang <xiang.ye@intel.com>
---
drivers/spi/Kconfig | 11 ++
drivers/spi/Makefile | 1 +
drivers/spi/spi-ljca.c | 291 +++++++++++++++++++++++++++++++++++++++++
3 files changed, 303 insertions(+)
create mode 100644 drivers/spi/spi-ljca.c
diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
index 3b1c0878bb85..b7ce4cbeb024 100644
--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -396,6 +396,17 @@ config SPI_HISI_SFC_V3XX
This enables support for HiSilicon v3xx SPI NOR flash controller
found in hi16xx chipsets.
+config SPI_LJCA
+ tristate "Intel La Jolla Cove Adapter SPI support"
+ depends on MFD_LJCA
+ default MFD_LJCA
+ help
+ Select this option to enable SPI driver for the Intel
+ La Jolla Cove Adapter (LJCA) board.
+
+ This driver can also be built as a module. If so, the module
+ will be called spi-ljca.
+
config SPI_NXP_FLEXSPI
tristate "NXP Flex SPI controller"
depends on ARCH_LAYERSCAPE || HAS_IOMEM
diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile
index be9ba40ef8d0..871a088294cb 100644
--- a/drivers/spi/Makefile
+++ b/drivers/spi/Makefile
@@ -68,6 +68,7 @@ obj-$(CONFIG_SPI_INTEL_PCI) += spi-intel-pci.o
obj-$(CONFIG_SPI_INTEL_PLATFORM) += spi-intel-platform.o
obj-$(CONFIG_SPI_LANTIQ_SSC) += spi-lantiq-ssc.o
obj-$(CONFIG_SPI_JCORE) += spi-jcore.o
+obj-$(CONFIG_SPI_LJCA) += spi-ljca.o
obj-$(CONFIG_SPI_LM70_LLP) += spi-lm70llp.o
obj-$(CONFIG_SPI_LP8841_RTC) += spi-lp8841-rtc.o
obj-$(CONFIG_SPI_MESON_SPICC) += spi-meson-spicc.o
diff --git a/drivers/spi/spi-ljca.c b/drivers/spi/spi-ljca.c
new file mode 100644
index 000000000000..d55c30954bb7
--- /dev/null
+++ b/drivers/spi/spi-ljca.c
@@ -0,0 +1,291 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Intel La Jolla Cove Adapter USB-SPI driver
+ *
+ * Copyright (c) 2023, Intel Corporation.
+ */
+
+#include <linux/bitfield.h>
+#include <linux/bits.h>
+#include <linux/dev_printk.h>
+#include <linux/mfd/ljca.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/spi/spi.h>
+
+/* SPI commands */
+enum ljca_spi_cmd {
+ LJCA_SPI_INIT = 1,
+ LJCA_SPI_READ,
+ LJCA_SPI_WRITE,
+ LJCA_SPI_WRITEREAD,
+ LJCA_SPI_DEINIT,
+};
+
+#define LJCA_SPI_BUS_MAX_HZ 48000000
+enum {
+ LJCA_SPI_BUS_SPEED_24M,
+ LJCA_SPI_BUS_SPEED_12M,
+ LJCA_SPI_BUS_SPEED_8M,
+ LJCA_SPI_BUS_SPEED_6M,
+ LJCA_SPI_BUS_SPEED_4_8M, /*4.8MHz*/
+ LJCA_SPI_BUS_SPEED_MIN = LJCA_SPI_BUS_SPEED_4_8M,
+};
+
+enum {
+ LJCA_SPI_CLOCK_LOW_POLARITY,
+ LJCA_SPI_CLOCK_HIGH_POLARITY,
+};
+
+enum {
+ LJCA_SPI_CLOCK_FIRST_PHASE,
+ LJCA_SPI_CLOCK_SECOND_PHASE,
+};
+
+#define LJCA_SPI_BUF_SIZE 60
+#define LJCA_SPI_MAX_XFER_SIZE (LJCA_SPI_BUF_SIZE - sizeof(struct spi_xfer_packet))
+
+#define LJCA_SPI_CLK_MODE_POLARITY BIT(0)
+#define LJCA_SPI_CLK_MODE_PHASE BIT(1)
+
+struct spi_init_packet {
+ u8 index;
+ u8 speed;
+ u8 mode;
+} __packed;
+
+#define LJCA_SPI_XFER_INDICATOR_ID GENMASK(5, 0)
+#define LJCA_SPI_XFER_INDICATOR_CMPL BIT(6)
+#define LJCA_SPI_XFER_INDICATOR_INDEX BIT(7)
+
+struct spi_xfer_packet {
+ u8 indicator;
+ s8 len;
+ u8 data[];
+} __packed;
+
+struct ljca_spi_dev {
+ struct platform_device *pdev;
+ struct spi_controller *controller;
+ struct ljca_spi_info *spi_info;
+ u8 speed;
+ u8 mode;
+
+ u8 obuf[LJCA_SPI_BUF_SIZE];
+ u8 ibuf[LJCA_SPI_BUF_SIZE];
+};
+
+static int ljca_spi_read_write(struct ljca_spi_dev *ljca_spi, const u8 *w_data, u8 *r_data, int len,
+ int id, int complete, int cmd)
+{
+ struct spi_xfer_packet *w_packet = (struct spi_xfer_packet *)ljca_spi->obuf;
+ struct spi_xfer_packet *r_packet = (struct spi_xfer_packet *)ljca_spi->ibuf;
+ unsigned int ibuf_len = LJCA_SPI_BUF_SIZE;
+ int ret;
+
+ w_packet->indicator = FIELD_PREP(LJCA_SPI_XFER_INDICATOR_ID, id) |
+ FIELD_PREP(LJCA_SPI_XFER_INDICATOR_CMPL, complete) |
+ FIELD_PREP(LJCA_SPI_XFER_INDICATOR_INDEX,
+ ljca_spi->spi_info->id);
+
+ if (cmd == LJCA_SPI_READ) {
+ w_packet->len = sizeof(u16);
+ *(u16 *)&w_packet->data[0] = len;
+ } else {
+ w_packet->len = len;
+ memcpy(w_packet->data, w_data, len);
+ }
+
+ ret = ljca_transfer(ljca_spi->spi_info->ljca, cmd, w_packet,
+ struct_size(w_packet, data, w_packet->len), r_packet, &ibuf_len);
+ if (ret)
+ return ret;
+
+ if (ibuf_len < sizeof(*r_packet) || r_packet->len <= 0)
+ return -EIO;
+
+ if (r_data)
+ memcpy(r_data, r_packet->data, r_packet->len);
+
+ return 0;
+}
+
+static int ljca_spi_init(struct ljca_spi_dev *ljca_spi, u8 div, u8 mode)
+{
+ struct spi_init_packet w_packet = {};
+ int ret;
+
+ if (ljca_spi->mode == mode && ljca_spi->speed == div)
+ return 0;
+
+ w_packet.mode = FIELD_PREP(LJCA_SPI_CLK_MODE_POLARITY,
+ (mode & SPI_CPOL) ? LJCA_SPI_CLOCK_HIGH_POLARITY :
+ LJCA_SPI_CLOCK_LOW_POLARITY) |
+ FIELD_PREP(LJCA_SPI_CLK_MODE_PHASE,
+ (mode & SPI_CPHA) ? LJCA_SPI_CLOCK_SECOND_PHASE :
+ LJCA_SPI_CLOCK_FIRST_PHASE);
+
+ w_packet.index = ljca_spi->spi_info->id;
+ w_packet.speed = div;
+ ret = ljca_transfer(ljca_spi->spi_info->ljca, LJCA_SPI_INIT, &w_packet,
+ sizeof(w_packet), NULL, NULL);
+ if (ret)
+ return ret;
+
+ ljca_spi->mode = mode;
+ ljca_spi->speed = div;
+ return 0;
+}
+
+static int ljca_spi_deinit(struct ljca_spi_dev *ljca_spi)
+{
+ struct spi_init_packet w_packet = {};
+
+ w_packet.index = ljca_spi->spi_info->id;
+ return ljca_transfer(ljca_spi->spi_info->ljca, LJCA_SPI_DEINIT, &w_packet, sizeof(w_packet),
+ NULL, NULL);
+}
+
+static int ljca_spi_transfer(struct ljca_spi_dev *ljca_spi, const u8 *tx_data,
+ u8 *rx_data, u16 len)
+{
+ int ret;
+ int remaining = len;
+ int offset = 0;
+ int cur_len;
+ int complete;
+ int i;
+ int cmd;
+
+ if (tx_data && rx_data)
+ cmd = LJCA_SPI_WRITEREAD;
+ else if (tx_data)
+ cmd = LJCA_SPI_WRITE;
+ else if (rx_data)
+ cmd = LJCA_SPI_READ;
+ else
+ return -EINVAL;
+
+ for (i = 0; remaining > 0; i++) {
+ cur_len = min_t(unsigned int, remaining, LJCA_SPI_MAX_XFER_SIZE);
+ complete = (cur_len == remaining);
+
+ ret = ljca_spi_read_write(ljca_spi,
+ tx_data ? tx_data + offset : NULL,
+ rx_data ? rx_data + offset : NULL,
+ cur_len, i, complete, cmd);
+ if (ret)
+ return ret;
+
+ offset += cur_len;
+ remaining -= cur_len;
+ }
+
+ return 0;
+}
+
+static int ljca_spi_transfer_one(struct spi_controller *controller, struct spi_device *spi,
+ struct spi_transfer *xfer)
+{
+ struct ljca_spi_dev *ljca_spi = spi_controller_get_devdata(controller);
+ int ret;
+ u8 div;
+
+ div = min_t(u8, LJCA_SPI_BUS_SPEED_MIN,
+ DIV_ROUND_UP(controller->max_speed_hz, xfer->speed_hz) / 2 - 1);
+ ret = ljca_spi_init(ljca_spi, div, spi->mode);
+ if (ret) {
+ dev_err(&ljca_spi->pdev->dev, "cannot initialize transfer ret %d\n", ret);
+ return ret;
+ }
+
+ ret = ljca_spi_transfer(ljca_spi, xfer->tx_buf, xfer->rx_buf, xfer->len);
+ if (ret)
+ dev_err(&ljca_spi->pdev->dev, "ljca spi transfer failed!\n");
+
+ return ret;
+}
+
+static int ljca_spi_probe(struct platform_device *pdev)
+{
+ struct spi_controller *controller;
+ struct ljca_spi_dev *ljca_spi;
+ int ret;
+
+ controller = devm_spi_alloc_master(&pdev->dev, sizeof(*ljca_spi));
+ if (!controller)
+ return -ENOMEM;
+
+ platform_set_drvdata(pdev, controller);
+ ljca_spi = spi_controller_get_devdata(controller);
+
+ ljca_spi->spi_info = dev_get_platdata(&pdev->dev);
+ ljca_spi->controller = controller;
+ ljca_spi->pdev = pdev;
+ device_set_node(&ljca_spi->controller->dev, dev_fwnode(&pdev->dev));
+
+ controller->bus_num = -1;
+ controller->mode_bits = SPI_CPHA | SPI_CPOL;
+ controller->transfer_one = ljca_spi_transfer_one;
+ controller->auto_runtime_pm = false;
+ controller->max_speed_hz = LJCA_SPI_BUS_MAX_HZ;
+
+ ret = spi_register_controller(controller);
+ if (ret)
+ dev_err(&pdev->dev, "Failed to register controller\n");
+
+ return ret;
+}
+
+static int ljca_spi_dev_remove(struct platform_device *pdev)
+{
+ struct spi_controller *controller = platform_get_drvdata(pdev);
+ struct ljca_spi_dev *ljca_spi = spi_controller_get_devdata(controller);
+
+ spi_unregister_controller(controller);
+ ljca_spi_deinit(ljca_spi);
+ return 0;
+}
+
+static int ljca_spi_dev_suspend(struct device *dev)
+{
+ struct spi_controller *controller = dev_get_drvdata(dev);
+
+ return spi_controller_suspend(controller);
+}
+
+static int ljca_spi_dev_resume(struct device *dev)
+{
+ struct spi_controller *controller = dev_get_drvdata(dev);
+
+ return spi_controller_resume(controller);
+}
+
+static const struct dev_pm_ops ljca_spi_pm = {
+ SYSTEM_SLEEP_PM_OPS(ljca_spi_dev_suspend, ljca_spi_dev_resume)
+};
+
+#define LJCA_SPI_DRV_NAME "ljca-spi"
+static const struct platform_device_id ljca_spi_id[] = {
+ { LJCA_SPI_DRV_NAME, 0 },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(platform, ljca_spi_id);
+
+static struct platform_driver spi_ljca_driver = {
+ .driver = {
+ .name = LJCA_SPI_DRV_NAME,
+ .pm = &ljca_spi_pm,
+ },
+ .probe = ljca_spi_probe,
+ .remove = ljca_spi_dev_remove,
+};
+
+module_platform_driver(spi_ljca_driver);
+
+MODULE_AUTHOR("Ye Xiang <xiang.ye@intel.com>");
+MODULE_AUTHOR("Wang Zhifeng <zhifeng.wang@intel.com>");
+MODULE_AUTHOR("Zhang Lixu <lixu.zhang@intel.com>");
+MODULE_DESCRIPTION("Intel La Jolla Cove Adapter USB-SPI driver");
+MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS(LJCA);
--
2.34.1
^ permalink raw reply related [flat|nested] 9+ messages in thread
* [PATCH v2 5/5] Documentation: Add ABI doc for attributes of LJCA device
2023-02-25 14:01 [PATCH v2 0/5] Add Intel LJCA device driver Ye Xiang
` (3 preceding siblings ...)
2023-02-25 14:01 ` [PATCH v2 4/5] spi: Add support for Intel LJCA USB SPI driver Ye Xiang
@ 2023-02-25 14:01 ` Ye Xiang
4 siblings, 0 replies; 9+ messages in thread
From: Ye Xiang @ 2023-02-25 14:01 UTC (permalink / raw
To: Lee Jones, Wolfram Sang, Tyrone Ting, Mark Brown, Linus Walleij,
Bartosz Golaszewski, linux-i2c, linux-kernel, linux-spi,
linux-gpio
Cc: srinivas.pandruvada, heikki.krogerus, andriy.shevchenko,
sakari.ailus, zhifeng.wang, wentong.wu, lixu.zhang, Ye Xiang
Add sysfs attributes Documentation entries for LJCA device
Signed-off-by: Ye Xiang <xiang.ye@intel.com>
---
.../ABI/testing/sysfs-bus-usb-devices-ljca | 22 +++++++++++++++++++
1 file changed, 22 insertions(+)
create mode 100644 Documentation/ABI/testing/sysfs-bus-usb-devices-ljca
diff --git a/Documentation/ABI/testing/sysfs-bus-usb-devices-ljca b/Documentation/ABI/testing/sysfs-bus-usb-devices-ljca
new file mode 100644
index 000000000000..43b95effdefc
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-bus-usb-devices-ljca
@@ -0,0 +1,22 @@
+What: /sys/bus/usb/.../version
+Date: July 2023
+KernelVersion: 6.4
+Contact: Ye Xiang <xiang.ye@intel.com>
+Description:
+ Provides the current firmware version of LJCA device.
+ The format is Major.Minor.Patch.Build, where
+ Major, Minor, Patch, and Build are decimal numbers.
+ For example: 1.0.0.256
+
+What: /sys/bus/usb/.../cmd
+Date: July 2023
+KernelVersion: 6.4
+Contact: Ye Xiang <xiang.ye@intel.com>
+Description:
+ Commands supported by LJCA device.
+ When read, it will return valid commands.
+ When write with a command, it will execute the command.
+ Valid commands are [dfu, debug]
+ dfu: Echo dfu to this file so as to put the device into
+ DFU mode so the firmware can be updated.
+ debug: Enable debug logging.
--
2.34.1
^ permalink raw reply related [flat|nested] 9+ messages in thread
* Re: [PATCH v2 4/5] spi: Add support for Intel LJCA USB SPI driver
2023-02-25 14:01 ` [PATCH v2 4/5] spi: Add support for Intel LJCA USB SPI driver Ye Xiang
@ 2023-02-27 17:23 ` Mark Brown
2023-02-28 6:41 ` Ye, Xiang
0 siblings, 1 reply; 9+ messages in thread
From: Mark Brown @ 2023-02-27 17:23 UTC (permalink / raw
To: Ye Xiang
Cc: Lee Jones, Wolfram Sang, Tyrone Ting, Linus Walleij,
Bartosz Golaszewski, linux-i2c, linux-kernel, linux-spi,
linux-gpio, srinivas.pandruvada, heikki.krogerus,
andriy.shevchenko, sakari.ailus, zhifeng.wang, wentong.wu,
lixu.zhang
[-- Attachment #1: Type: text/plain, Size: 1110 bytes --]
On Sat, Feb 25, 2023 at 10:01:17PM +0800, Ye Xiang wrote:
> +struct spi_xfer_packet {
> + u8 indicator;
> + s8 len;
> + u8 data[];
> +} __packed;
> +static int ljca_spi_read_write(struct ljca_spi_dev *ljca_spi, const u8 *w_data, u8 *r_data, int len,
> + int id, int complete, int cmd)
> +{
> + struct spi_xfer_packet *w_packet = (struct spi_xfer_packet *)ljca_spi->obuf;
> + struct spi_xfer_packet *r_packet = (struct spi_xfer_packet *)ljca_spi->ibuf;
> + unsigned int ibuf_len = LJCA_SPI_BUF_SIZE;
> + int ret;
> +
> + w_packet->indicator = FIELD_PREP(LJCA_SPI_XFER_INDICATOR_ID, id) |
> + FIELD_PREP(LJCA_SPI_XFER_INDICATOR_CMPL, complete) |
> + FIELD_PREP(LJCA_SPI_XFER_INDICATOR_INDEX,
> + ljca_spi->spi_info->id);
> +
> + if (cmd == LJCA_SPI_READ) {
> + w_packet->len = sizeof(u16);
> + *(u16 *)&w_packet->data[0] = len;
Are there no endianness considerations here?
> +static int ljca_spi_transfer(struct ljca_spi_dev *ljca_spi, const u8 *tx_data,
> + u8 *rx_data, u16 len)
> +{
This function has one caller with barely anything in it - perhaps just
inline it?
[-- Attachment #2: signature.asc --]
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^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: [PATCH v2 4/5] spi: Add support for Intel LJCA USB SPI driver
2023-02-27 17:23 ` Mark Brown
@ 2023-02-28 6:41 ` Ye, Xiang
0 siblings, 0 replies; 9+ messages in thread
From: Ye, Xiang @ 2023-02-28 6:41 UTC (permalink / raw
To: Mark Brown
Cc: Lee Jones, Wolfram Sang, Tyrone Ting, Linus Walleij,
Bartosz Golaszewski, linux-i2c@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-spi@vger.kernel.org,
linux-gpio@vger.kernel.org, Pandruvada, Srinivas,
heikki.krogerus@linux.intel.com,
andriy.shevchenko@linux.intel.com, sakari.ailus@linux.intel.com,
Wang, Zhifeng, Wu, Wentong, Zhang, Lixu
Hi Mark,
Thanks for the review.
On Tue, Feb 28, 2023 at 01:23:09AM +0800, Mark Brown wrote:
> On Sat, Feb 25, 2023 at 10:01:17PM +0800, Ye Xiang wrote:
>
> > +struct spi_xfer_packet {
> > + u8 indicator;
> > + s8 len;
> > + u8 data[];
> > +} __packed;
>
> > +static int ljca_spi_read_write(struct ljca_spi_dev *ljca_spi, const u8 *w_data, u8 *r_data, int len,
> > + int id, int complete, int cmd)
> > +{
> > + struct spi_xfer_packet *w_packet = (struct spi_xfer_packet *)ljca_spi->obuf;
> > + struct spi_xfer_packet *r_packet = (struct spi_xfer_packet *)ljca_spi->ibuf;
> > + unsigned int ibuf_len = LJCA_SPI_BUF_SIZE;
> > + int ret;
> > +
> > + w_packet->indicator = FIELD_PREP(LJCA_SPI_XFER_INDICATOR_ID, id) |
> > + FIELD_PREP(LJCA_SPI_XFER_INDICATOR_CMPL, complete) |
> > + FIELD_PREP(LJCA_SPI_XFER_INDICATOR_INDEX,
> > + ljca_spi->spi_info->id);
> > +
> > + if (cmd == LJCA_SPI_READ) {
> > + w_packet->len = sizeof(u16);
> > + *(u16 *)&w_packet->data[0] = len;
>
> Are there no endianness considerations here?
Yes, it should be little endian. Will address this.
>
> > +static int ljca_spi_transfer(struct ljca_spi_dev *ljca_spi, const u8 *tx_data,
> > + u8 *rx_data, u16 len)
> > +{
>
> This function has one caller with barely anything in it - perhaps just
> inline it?
Agree. Will make this function inline.
--
Thanks
Ye Xiang
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: [PATCH v2 2/5] gpio: Add support for Intel LJCA USB GPIO driver
2023-02-25 14:01 ` [PATCH v2 2/5] gpio: Add support for Intel LJCA USB GPIO driver Ye Xiang
@ 2023-03-06 14:02 ` Linus Walleij
0 siblings, 0 replies; 9+ messages in thread
From: Linus Walleij @ 2023-03-06 14:02 UTC (permalink / raw
To: Ye Xiang, Andy Shevchenko
Cc: Lee Jones, Wolfram Sang, Tyrone Ting, Mark Brown,
Bartosz Golaszewski, linux-i2c, linux-kernel, linux-spi,
linux-gpio, srinivas.pandruvada, heikki.krogerus, sakari.ailus,
zhifeng.wang, wentong.wu, lixu.zhang
On Sat, Feb 25, 2023 at 3:01 PM Ye Xiang <xiang.ye@intel.com> wrote:
> This patch implements the GPIO function of Intel USB-I2C/GPIO/SPI adapter
> device named "La Jolla Cove Adapter" (LJCA). It communicate with LJCA
> GPIO module with specific protocol through interfaces exported by LJCA USB
> driver.
>
> Signed-off-by: Ye Xiang <xiang.ye@intel.com>
Looks good to me, also looks like a really helpful adapter.
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
I would appreciate if Andy could ACK it too, as Intel engineer.
Yours,
Linus Walleij
^ permalink raw reply [flat|nested] 9+ messages in thread
end of thread, other threads:[~2023-03-06 14:03 UTC | newest]
Thread overview: 9+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2023-02-25 14:01 [PATCH v2 0/5] Add Intel LJCA device driver Ye Xiang
2023-02-25 14:01 ` [PATCH v2 1/5] mfd: Add support for Intel LJCA device Ye Xiang
2023-02-25 14:01 ` [PATCH v2 2/5] gpio: Add support for Intel LJCA USB GPIO driver Ye Xiang
2023-03-06 14:02 ` Linus Walleij
2023-02-25 14:01 ` [PATCH v2 3/5] i2c: Add support for Intel LJCA USB I2C driver Ye Xiang
2023-02-25 14:01 ` [PATCH v2 4/5] spi: Add support for Intel LJCA USB SPI driver Ye Xiang
2023-02-27 17:23 ` Mark Brown
2023-02-28 6:41 ` Ye, Xiang
2023-02-25 14:01 ` [PATCH v2 5/5] Documentation: Add ABI doc for attributes of LJCA device Ye Xiang
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