diff mbox series

[v12,4/4] gpio: update Intel LJCA USB GPIO driver

Message ID 1693546577-17824-5-git-send-email-wentong.wu@intel.com
State Superseded
Headers show
Series Add Intel LJCA device driver | expand

Commit Message

Wu, Wentong Sept. 1, 2023, 5:36 a.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>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
---
 drivers/gpio/Kconfig     |   4 +-
 drivers/gpio/gpio-ljca.c | 246 +++++++++++++++++++++++++++--------------------
 2 files changed, 145 insertions(+), 105 deletions(-)

Comments

Andi Shyti Sept. 1, 2023, 3:18 p.m. UTC | #1 
Hi Wentong,

On Fri, Sep 01, 2023 at 01:36:17PM +0800, Wentong Wu 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>
> Acked-by: Linus Walleij <linus.walleij@linaro.org>
> Acked-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

I am not understanding this patch... Looks like a collection of
random to relevant changes you did in gpio-ljca.c.

I'm not able to review this, can you please split it in minor
changes?

Meanwhile the previous patches should be able to work without
this one, right?

Andi
Wu, Wentong Sept. 2, 2023, 5:29 p.m. UTC | #2 
Hi Andi,

Thanks for your review

> From: Andi Shyti <andi.shyti@linux.intel.com>
> 
> Hi Wentong,
> 
> On Fri, Sep 01, 2023 at 01:36:17PM +0800, Wentong Wu 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>
> > Acked-by: Linus Walleij <linus.walleij@linaro.org>
> > Acked-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
> 
> I am not understanding this patch... Looks like a collection of random to
> relevant changes you did in gpio-ljca.c.

This patch is following the changes of usb-ljca, from platform_device to
auxiliary_device, and ljca_transfer API's change. And others are mainly
coding style's change. 

> 
> I'm not able to review this, can you please split it in minor changes?
> 
> Meanwhile the previous patches should be able to work without this one, right?

I don't think it can work without usb-ljca

BR,
Wentong

> 
> Andi
Andi Shyti Sept. 2, 2023, 6:14 p.m. UTC | #3 
Hi Wentong,

> > On Fri, Sep 01, 2023 at 01:36:17PM +0800, Wentong Wu 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>
> > > Acked-by: Linus Walleij <linus.walleij@linaro.org>
> > > Acked-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
> > 
> > I am not understanding this patch... Looks like a collection of random to
> > relevant changes you did in gpio-ljca.c.
> 
> This patch is following the changes of usb-ljca, from platform_device to
> auxiliary_device, and ljca_transfer API's change. And others are mainly
> coding style's change. 

then please divide this into smaller commits. Cosmetic changes
should be in separate patches, and functional changes in
different commits. They should not be mixed together.

> > I'm not able to review this, can you please split it in minor changes?
> > 
> > Meanwhile the previous patches should be able to work without this one, right?
> 
> I don't think it can work without usb-ljca

I am actually asking about the reverse. Are we confident that
patches 1, 2, and 3 function correctly without this one? I didn't
notice any dependencies.

If that's the case, I would suggest removing this patch from the
series, merging patches 1, 2, and 3, and then addressing this
patch separately. It can be properly divided and expanded into a
more comprehensive series.

Andi
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..8965677 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);
 	}
@@ -421,34 +462,33 @@  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("Wang Zhifeng <zhifeng.wang@intel.com>");
-MODULE_AUTHOR("Zhang Lixu <lixu.zhang@intel.com>");
+MODULE_AUTHOR("Wentong Wu <wentong.wu@intel.com>");
+MODULE_AUTHOR("Zhifeng Wang <zhifeng.wang@intel.com>");
+MODULE_AUTHOR("Lixu Zhang <lixu.zhang@intel.com>");
 MODULE_DESCRIPTION("Intel La Jolla Cove Adapter USB-GPIO driver");
 MODULE_LICENSE("GPL");
 MODULE_IMPORT_NS(LJCA);