diff mbox series

[v9,4/4] gpio: update Intel LJCA USB GPIO driver

Message ID 1692225111-19216-5-git-send-email-wentong.wu@intel.com (mailing list archive)
State Superseded
Headers show
Series Add Intel LJCA device driver | expand

Commit Message

Wu, Wentong Aug. 16, 2023, 10:31 p.m. UTC 
This driver communicate with LJCA GPIO module with specific
protocol through interfaces exported by LJCA USB driver.
Update the driver according to LJCA USB driver's changes.

Signed-off-by: Wentong Wu <wentong.wu@intel.com>
Reviewed-by: Sakari Ailus <sakari.ailus@linux.intel.com>
---
 drivers/gpio/Kconfig     |   4 +-
 drivers/gpio/gpio-ljca.c | 242 +++++++++++++++++++++++++++--------------------
 2 files changed, 143 insertions(+), 103 deletions(-)

Comments

Linus Walleij Aug. 17, 2023, 7:03 a.m. UTC | #1 
On Thu, Aug 17, 2023 at 12:32 AM Wentong Wu <wentong.wu@intel.com> wrote:

> This driver communicate with LJCA GPIO module with specific
> protocol through interfaces exported by LJCA USB driver.
> Update the driver according to LJCA USB driver's changes.
>
> Signed-off-by: Wentong Wu <wentong.wu@intel.com>
> Reviewed-by: Sakari Ailus <sakari.ailus@linux.intel.com>

This patch does several things at the same time, consider the
"one technical step per patch" approach, for some definition
of a "technical step". The upside is that git bisect gets better
precision when something goes sidewise.

However it's no big deal for me as I'm not hung up on process
and I bet you have tested the result, so:
Acked-by: Linus Walleij <linus.walleij@linaro.org>

Yours,
Linus Walleij
Wu, Wentong Aug. 17, 2023, 7:07 a.m. UTC | #2 
> From: Linus Walleij <linus.walleij@linaro.org>
> 
> On Thu, Aug 17, 2023 at 12:32 AM Wentong Wu <wentong.wu@intel.com>
> wrote:
> 
> > This driver communicate with LJCA GPIO module with specific protocol
> > through interfaces exported by LJCA USB driver.
> > Update the driver according to LJCA USB driver's changes.
> >
> > Signed-off-by: Wentong Wu <wentong.wu@intel.com>
> > Reviewed-by: Sakari Ailus <sakari.ailus@linux.intel.com>
> 
> This patch does several things at the same time, consider the "one technical step
> per patch" approach, for some definition of a "technical step". The upside is that
> git bisect gets better precision when something goes sidewise.

Ack, thanks. I will follow this going forward.

> 
> However it's no big deal for me as I'm not hung up on process and
> I bet you have tested the result, so:

Definitely, I have tested this patch sets dozens of times.

> Acked-by: Linus Walleij <linus.walleij@linaro.org>

Thanks a lot

BR,
Wentong
> 
> Yours,
> Linus Walleij
Sakari Ailus Aug. 23, 2023, 7:01 p.m. UTC | #3 
Hi Wentong, Linus,

On Thu, Aug 17, 2023 at 07:07:54AM +0000, Wu, Wentong wrote:
> > From: Linus Walleij <linus.walleij@linaro.org>
> > 
> > On Thu, Aug 17, 2023 at 12:32 AM Wentong Wu <wentong.wu@intel.com>
> > wrote:
> > 
> > > This driver communicate with LJCA GPIO module with specific protocol
> > > through interfaces exported by LJCA USB driver.
> > > Update the driver according to LJCA USB driver's changes.
> > >
> > > Signed-off-by: Wentong Wu <wentong.wu@intel.com>
> > > Reviewed-by: Sakari Ailus <sakari.ailus@linux.intel.com>
> > 
> > This patch does several things at the same time, consider the "one technical step
> > per patch" approach, for some definition of a "technical step". The upside is that
> > git bisect gets better precision when something goes sidewise.
> 
> Ack, thanks. I will follow this going forward.

The old LJCA GPIO driver got added without the rest of the LJCA, including
the main driver (now 1st patch of this set). I might have just reverted the
patch that added the old one and put the new one on top.

The old driver was never usable AFAIU and there are many changes as Linus
noted. It would be easier to review as new driver.

I wonder what others think.
Wu, Wentong Aug. 24, 2023, 12:54 a.m. UTC | #4 
> From: sakari.ailus@linux.intel.com <sakari.ailus@linux.intel.com>
> 
> Hi Wentong, Linus,
> 
> On Thu, Aug 17, 2023 at 07:07:54AM +0000, Wu, Wentong wrote:
> > > From: Linus Walleij <linus.walleij@linaro.org>
> > >
> > > On Thu, Aug 17, 2023 at 12:32 AM Wentong Wu <wentong.wu@intel.com>
> > > wrote:
> > >
> > > > This driver communicate with LJCA GPIO module with specific
> > > > protocol through interfaces exported by LJCA USB driver.
> > > > Update the driver according to LJCA USB driver's changes.
> > > >
> > > > Signed-off-by: Wentong Wu <wentong.wu@intel.com>
> > > > Reviewed-by: Sakari Ailus <sakari.ailus@linux.intel.com>
> > >
> > > This patch does several things at the same time, consider the "one
> > > technical step per patch" approach, for some definition of a
> > > "technical step". The upside is that git bisect gets better precision when
> something goes sidewise.
> >
> > Ack, thanks. I will follow this going forward.
> 
> The old LJCA GPIO driver got added without the rest of the LJCA, including the
> main driver (now 1st patch of this set). I might have just reverted the patch that
> added the old one and put the new one on top.
> 
> The old driver was never usable AFAIU and there are many changes as Linus
> noted. It would be easier to review as new driver.
> 
> I wonder what others think.

Agree, Thanks

BR,
Wentong
> 
> --
> Regards,
> 
> Sakari Ailus
diff mbox series

Patch

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index e382dfe..c85843b 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -1294,9 +1294,9 @@  config GPIO_KEMPLD
 
 config GPIO_LJCA
 	tristate "INTEL La Jolla Cove Adapter GPIO support"
-	depends on MFD_LJCA
+	depends on USB_LJCA
 	select GPIOLIB_IRQCHIP
-	default MFD_LJCA
+	default USB_LJCA
 	help
 	  Select this option to enable GPIO driver for the INTEL
 	  La Jolla Cove Adapter (LJCA) board.
diff --git a/drivers/gpio/gpio-ljca.c b/drivers/gpio/gpio-ljca.c
index 87863f0..f603095 100644
--- a/drivers/gpio/gpio-ljca.c
+++ b/drivers/gpio/gpio-ljca.c
@@ -6,6 +6,7 @@ 
  */
 
 #include <linux/acpi.h>
+#include <linux/auxiliary_bus.h>
 #include <linux/bitfield.h>
 #include <linux/bitops.h>
 #include <linux/dev_printk.h>
@@ -13,19 +14,18 @@ 
 #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>
+#include <linux/usb/ljca.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_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)
@@ -36,45 +36,49 @@ 
 #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)
+#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)
+#define LJCA_GPIO_CONF_SET		BIT(3)
+#define LJCA_GPIO_CONF_CLR		BIT(4)
 
-struct gpio_op {
+#define LJCA_GPIO_BUF_SIZE		60u
+
+struct ljca_gpio_op {
 	u8 index;
 	u8 value;
 } __packed;
 
-struct gpio_packet {
+struct ljca_gpio_packet {
 	u8 num;
-	struct gpio_op item[];
+	struct ljca_gpio_op item[];
 } __packed;
 
-#define LJCA_GPIO_BUF_SIZE 60
 struct ljca_gpio_dev {
-	struct platform_device *pdev;
+	struct ljca_client *ljca;
 	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);
+	DECLARE_BITMAP(output_enabled, LJCA_MAX_GPIO_NUM);
 	u8 *connect_mode;
-	/* mutex to protect irq bus */
+	/* protect irq bus */
 	struct mutex irq_lock;
 	struct work_struct work;
-	/* lock to protect package transfer to Hardware */
+	/* 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)
+static int ljca_gpio_config(struct ljca_gpio_dev *ljca_gpio, u8 gpio_id,
+			    u8 config)
 {
-	struct gpio_packet *packet = (struct gpio_packet *)ljca_gpio->obuf;
+	struct ljca_gpio_packet *packet =
+				(struct ljca_gpio_packet *)ljca_gpio->obuf;
 	int ret;
 
 	mutex_lock(&ljca_gpio->trans_lock);
@@ -82,43 +86,43 @@  static int gpio_config(struct ljca_gpio_dev *ljca_gpio, u8 gpio_id, u8 config)
 	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);
+	ret = ljca_transfer(ljca_gpio->ljca, LJCA_GPIO_CONFIG, packet,
+			    struct_size(packet, item, packet->num), NULL, 0);
 	mutex_unlock(&ljca_gpio->trans_lock);
-	return ret;
+
+	return ret < 0 ? ret : 0;
 }
 
 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;
+	struct ljca_gpio_packet *ack_packet =
+				(struct ljca_gpio_packet *)ljca_gpio->ibuf;
+	struct ljca_gpio_packet *packet =
+				(struct ljca_gpio_packet *)ljca_gpio->obuf;
 	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;
+	ret = ljca_transfer(ljca_gpio->ljca, LJCA_GPIO_READ, packet,
+			    struct_size(packet, item, packet->num),
+			    ljca_gpio->ibuf, LJCA_GPIO_BUF_SIZE);
+
+	if (ret <= 0 || ack_packet->num != packet->num) {
+		dev_err(&ljca_gpio->ljca->auxdev.dev,
+			"read package error, gpio_id: %u num: %u ret: %d\n",
+			gpio_id, ack_packet->num, ret);
+		ret = ret < 0 ? ret : -EIO;
 	}
-
-out_unlock:
 	mutex_unlock(&ljca_gpio->trans_lock);
-	if (ret)
-		return ret;
-	return ack_packet->item[0].value > 0;
+
+	return ret < 0 ? ret : ack_packet->item[0].value > 0;
 }
 
-static int ljca_gpio_write(struct ljca_gpio_dev *ljca_gpio, u8 gpio_id,
-			   int value)
+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;
+	struct ljca_gpio_packet *packet =
+			(struct ljca_gpio_packet *)ljca_gpio->obuf;
 	int ret;
 
 	mutex_lock(&ljca_gpio->trans_lock);
@@ -126,10 +130,11 @@  static int ljca_gpio_write(struct ljca_gpio_dev *ljca_gpio, u8 gpio_id,
 	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);
+	ret = ljca_transfer(ljca_gpio->ljca, LJCA_GPIO_WRITE, packet,
+			    struct_size(packet, item, packet->num), NULL, 0);
 	mutex_unlock(&ljca_gpio->trans_lock);
-	return ret;
+
+	return ret < 0 ? ret : 0;
 }
 
 static int ljca_gpio_get_value(struct gpio_chip *chip, unsigned int offset)
@@ -147,16 +152,24 @@  static void ljca_gpio_set_value(struct gpio_chip *chip, unsigned int offset,
 
 	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);
+		dev_err(chip->parent,
+			"set value failed offset: %u val: %d ret: %d\n",
+			offset, val, ret);
 }
 
-static int ljca_gpio_direction_input(struct gpio_chip *chip,
-				     unsigned int offset)
+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;
+	int ret;
 
-	return gpio_config(ljca_gpio, offset, config);
+	ret = ljca_gpio_config(ljca_gpio, offset, config);
+	if (ret)
+		return ret;
+
+	clear_bit(offset, ljca_gpio->output_enabled);
+
+	return 0;
 }
 
 static int ljca_gpio_direction_output(struct gpio_chip *chip,
@@ -166,14 +179,26 @@  static int ljca_gpio_direction_output(struct gpio_chip *chip,
 	u8 config = LJCA_GPIO_CONF_OUTPUT | LJCA_GPIO_CONF_CLR;
 	int ret;
 
-	ret = gpio_config(ljca_gpio, offset, config);
+	ret = ljca_gpio_config(ljca_gpio, offset, config);
 	if (ret)
 		return ret;
 
 	ljca_gpio_set_value(chip, offset, val);
+	set_bit(offset, ljca_gpio->output_enabled);
+
 	return 0;
 }
 
+static int ljca_gpio_get_direction(struct gpio_chip *chip, unsigned int offset)
+{
+	struct ljca_gpio_dev *ljca_gpio = gpiochip_get_data(chip);
+
+	if (test_bit(offset, ljca_gpio->output_enabled))
+		return GPIO_LINE_DIRECTION_OUT;
+
+	return GPIO_LINE_DIRECTION_IN;
+}
+
 static int ljca_gpio_set_config(struct gpio_chip *chip, unsigned int offset,
 				unsigned long config)
 {
@@ -197,7 +222,8 @@  static int ljca_gpio_set_config(struct gpio_chip *chip, unsigned int offset,
 	return 0;
 }
 
-static int ljca_gpio_init_valid_mask(struct gpio_chip *chip, unsigned long *valid_mask,
+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);
@@ -208,15 +234,18 @@  static int ljca_gpio_init_valid_mask(struct gpio_chip *chip, unsigned long *vali
 	return 0;
 }
 
-static void ljca_gpio_irq_init_valid_mask(struct gpio_chip *chip, unsigned long *valid_mask,
+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)
+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;
+	struct ljca_gpio_packet *packet =
+			(struct ljca_gpio_packet *)ljca_gpio->obuf;
 	int ret;
 
 	mutex_lock(&ljca_gpio->trans_lock);
@@ -224,18 +253,20 @@  static int ljca_enable_irq(struct ljca_gpio_dev *ljca_gpio, int gpio_id, bool en
 	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);
+	ret = ljca_transfer(ljca_gpio->ljca,
+			    enable ? LJCA_GPIO_INT_UNMASK : LJCA_GPIO_INT_MASK,
+			    packet, struct_size(packet, item, packet->num),
+			    NULL, 0);
 	mutex_unlock(&ljca_gpio->trans_lock);
-	return ret;
+
+	return ret < 0 ? ret : 0;
 }
 
 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;
+	struct ljca_gpio_dev *ljca_gpio =
+			container_of(work, struct ljca_gpio_dev, work);
+	int gpio_id, unmasked;
 
 	for_each_set_bit(gpio_id, ljca_gpio->reenable_irqs, ljca_gpio->gc.ngpio) {
 		clear_bit(gpio_id, ljca_gpio->reenable_irqs);
@@ -245,20 +276,22 @@  static void ljca_gpio_async(struct work_struct *work)
 	}
 }
 
-static void ljca_gpio_event_cb(void *context, u8 cmd, const void *evt_data, int len)
+static void ljca_gpio_event_cb(void *context, u8 cmd, const void *evt_data,
+			       int len)
 {
-	const struct gpio_packet *packet = evt_data;
+	const struct ljca_gpio_packet *packet = evt_data;
 	struct ljca_gpio_dev *ljca_gpio = context;
-	int i;
-	int irq;
+	int i, 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);
+		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",
+			dev_err(ljca_gpio->gc.parent,
+				"gpio_id %u does not mapped to IRQ yet\n",
 				packet->item[i].index);
 			return;
 		}
@@ -299,18 +332,22 @@  static int ljca_irq_set_type(struct irq_data *irqd, unsigned int type)
 	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);
+		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);
+		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);
+		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);
+		ljca_gpio->connect_mode[gpio_id] |=
+			(LJCA_GPIO_CONF_EDGE | LJCA_GPIO_CONF_PULLDOWN);
 		break;
 	default:
 		return -EINVAL;
@@ -332,15 +369,14 @@  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;
+	int enabled, 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_gpio_config(ljca_gpio, gpio_id, 0);
 			ljca_enable_irq(ljca_gpio, gpio_id, true);
 			set_bit(gpio_id, ljca_gpio->enabled_irqs);
 		} else {
@@ -363,43 +399,48 @@  static const struct irq_chip ljca_gpio_irqchip = {
 	GPIOCHIP_IRQ_RESOURCE_HELPERS,
 };
 
-static int ljca_gpio_probe(struct platform_device *pdev)
+static int ljca_gpio_probe(struct auxiliary_device *auxdev,
+			   const struct auxiliary_device_id *aux_dev_id)
 {
+	struct ljca_client *ljca = auxiliary_dev_to_ljca_client(auxdev);
 	struct ljca_gpio_dev *ljca_gpio;
 	struct gpio_irq_chip *girq;
 	int ret;
 
-	ljca_gpio = devm_kzalloc(&pdev->dev, sizeof(*ljca_gpio), GFP_KERNEL);
+	ljca_gpio = devm_kzalloc(&auxdev->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);
+	ljca_gpio->ljca = ljca;
+	ljca_gpio->gpio_info = dev_get_platdata(&auxdev->dev);
+	ljca_gpio->connect_mode = devm_kcalloc(&auxdev->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_direction = ljca_gpio_get_direction;
 	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.parent = &auxdev->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.label = ACPI_COMPANION(&auxdev->dev) ?
+			      acpi_dev_name(ACPI_COMPANION(&auxdev->dev)) :
+			      dev_name(&auxdev->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);
+	auxiliary_set_drvdata(auxdev, ljca_gpio);
+	ljca_register_event_cb(ljca, ljca_gpio_event_cb, ljca_gpio);
 
 	girq = &ljca_gpio->gc.irq;
 	gpio_irq_chip_set_chip(girq, &ljca_gpio_irqchip);
@@ -413,7 +454,7 @@  static int ljca_gpio_probe(struct platform_device *pdev)
 	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);
+		ljca_unregister_event_cb(ljca);
 		mutex_destroy(&ljca_gpio->irq_lock);
 		mutex_destroy(&ljca_gpio->trans_lock);
 	}
@@ -421,32 +462,31 @@  static int ljca_gpio_probe(struct platform_device *pdev)
 	return ret;
 }
 
-static int ljca_gpio_remove(struct platform_device *pdev)
+static void ljca_gpio_remove(struct auxiliary_device *auxdev)
 {
-	struct ljca_gpio_dev *ljca_gpio = platform_get_drvdata(pdev);
+	struct ljca_gpio_dev *ljca_gpio = auxiliary_get_drvdata(auxdev);
 
 	gpiochip_remove(&ljca_gpio->gc);
-	ljca_unregister_event_cb(ljca_gpio->gpio_info->ljca);
+	ljca_unregister_event_cb(ljca_gpio->ljca);
+	cancel_work_sync(&ljca_gpio->work);
 	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 */ }
+static const struct auxiliary_device_id ljca_gpio_id_table[] = {
+	{ "usb_ljca.ljca-gpio", 0 },
+	{ /* sentinel */ },
 };
-MODULE_DEVICE_TABLE(platform, ljca_gpio_id);
+MODULE_DEVICE_TABLE(auxiliary, ljca_gpio_id_table);
 
-static struct platform_driver ljca_gpio_driver = {
-	.driver.name = LJCA_GPIO_DRV_NAME,
+static struct auxiliary_driver ljca_gpio_driver = {
 	.probe = ljca_gpio_probe,
 	.remove = ljca_gpio_remove,
+	.id_table = ljca_gpio_id_table,
 };
-module_platform_driver(ljca_gpio_driver);
+module_auxiliary_driver(ljca_gpio_driver);
 
-MODULE_AUTHOR("Ye Xiang <xiang.ye@intel.com>");
+MODULE_AUTHOR("Wu Wentong <wentong.wu@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");