The Fintek F81534A series contains 3 GPIOs per UART and The max GPIOs
is 12x3 = 36 GPIOs.
Signed-off-by: Ji-Ze Hong (Peter Hong) <hpeter+linux_kernel@xxxxxxxxx>
---
drivers/usb/serial/f81232.c | 210 ++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 210 insertions(+)
diff --git a/drivers/usb/serial/f81232.c b/drivers/usb/serial/f81232.c
index 708d85c7d822..a53240bc164a 100644
--- a/drivers/usb/serial/f81232.c
+++ b/drivers/usb/serial/f81232.c
@@ -18,6 +18,7 @@
#include <linux/moduleparam.h>
#include <linux/mutex.h>
#include <linux/uaccess.h>
+#include <linux/gpio.h>
#include <linux/usb.h>
#include <linux/usb/serial.h>
#include <linux/serial_reg.h>
@@ -132,6 +133,7 @@ struct f81232_private {
struct f81534a_ctrl_private {
struct usb_interface *intf;
+ struct gpio_chip chip;
struct mutex lock;
int device_idx;
};
@@ -1007,6 +1009,204 @@ static int f81534a_ctrl_set_register(struct usb_device *dev, u16 reg, u16 size,
return status;
}
+static int f81534a_ctrl_set_mask_register(struct usb_device *dev, u16 reg,
+ u8 mask, u8 val)
+{
+ int status;
+ u8 tmp;
+
+ status = f81534a_ctrl_get_register(dev, reg, 1, &tmp);
+ if (status)
+ return status;
+
+
+ tmp = (tmp & ~mask) | (val & mask);
+
+ status = f81534a_ctrl_set_register(dev, reg, 1, &tmp);
+ if (status)
+ return status;
+
+ return 0;
+}
+
+#ifdef CONFIG_GPIOLIB
+static int f81534a_gpio_get(struct gpio_chip *chip, unsigned int gpio_num)
+{
+ struct f81534a_ctrl_private *priv = gpiochip_get_data(chip);
+ struct usb_interface *intf = priv->intf;
+ struct usb_device *dev = interface_to_usbdev(intf);
+ int status;
+ u8 tmp[2];
+ int set;
+ int idx;
+
+ set = gpio_num / F81534A_CTRL_GPIO_MAX_PIN;
+ idx = gpio_num % F81534A_CTRL_GPIO_MAX_PIN;
+
+ status = mutex_lock_interruptible(&priv->lock);
+ if (status)
+ return -EINTR;
+
+ status = f81534a_ctrl_get_register(dev, F81534A_CTRL_GPIO_REG + set,
+ sizeof(tmp), tmp);
+ if (status) {
+ mutex_unlock(&priv->lock);
+ return status;
+ }
+
+ mutex_unlock(&priv->lock);
+
+ return !!(tmp[1] & BIT(idx));
+}
+
+static int f81534a_gpio_direction_in(struct gpio_chip *chip,
+ unsigned int gpio_num)
+{
+ struct f81534a_ctrl_private *priv = gpiochip_get_data(chip);
+ struct usb_interface *intf = priv->intf;
+ struct usb_device *dev = interface_to_usbdev(intf);
+ int status;
+ int set;
+ int idx;
+ u8 mask;
+
+ set = gpio_num / F81534A_CTRL_GPIO_MAX_PIN;
+ idx = gpio_num % F81534A_CTRL_GPIO_MAX_PIN;
+ mask = F81534A_GPIO_MODE0_DIR << idx;
+
+ status = mutex_lock_interruptible(&priv->lock);
+ if (status)
+ return -EINTR;
+
+ status = f81534a_ctrl_set_mask_register(dev, F81534A_CTRL_GPIO_REG +
+ set, mask, mask);
+ if (status) {
+ mutex_unlock(&priv->lock);
+ return status;
+ }
+
+ mutex_unlock(&priv->lock);
+
+ return 0;
+}
+
+static int f81534a_gpio_direction_out(struct gpio_chip *chip,
+ unsigned int gpio_num, int val)
+{
+ struct f81534a_ctrl_private *priv = gpiochip_get_data(chip);
+ struct usb_interface *intf = priv->intf;
+ struct usb_device *dev = interface_to_usbdev(intf);
+ int status;
+ int set;
+ int idx;
+ u8 mask;
+ u8 data;
+
+ set = gpio_num / F81534A_CTRL_GPIO_MAX_PIN;
+ idx = gpio_num % F81534A_CTRL_GPIO_MAX_PIN;
+ mask = (F81534A_GPIO_MODE0_DIR << idx) | BIT(idx);
+ data = val ? BIT(idx) : 0;
+
+ status = mutex_lock_interruptible(&priv->lock);
+ if (status)
+ return -EINTR;
+
+ status = f81534a_ctrl_set_mask_register(dev, F81534A_CTRL_GPIO_REG +
+ set, mask, data);
+ if (status) {
+ mutex_unlock(&priv->lock);
+ return status;
+ }
+
+ mutex_unlock(&priv->lock);
+
+ return 0;
+}
+
+static void f81534a_gpio_set(struct gpio_chip *chip, unsigned int gpio_num,
+ int val)
+{
+ f81534a_gpio_direction_out(chip, gpio_num, val);
+}
+
+static int f81534a_gpio_get_direction(struct gpio_chip *chip,
+ unsigned int gpio_num)
+{
+ struct f81534a_ctrl_private *priv = gpiochip_get_data(chip);
+ struct usb_interface *intf = priv->intf;
+ struct usb_device *dev = interface_to_usbdev(intf);
+ int status;
+ u8 tmp[2];
+ int set;
+ int idx;
+ u8 mask;
+
+ set = gpio_num / F81534A_CTRL_GPIO_MAX_PIN;
+ idx = gpio_num % F81534A_CTRL_GPIO_MAX_PIN;
+ mask = F81534A_GPIO_MODE0_DIR << idx;
+
+ status = mutex_lock_interruptible(&priv->lock);
+ if (status)
+ return -EINTR;
+
+ status = f81534a_ctrl_get_register(dev, F81534A_CTRL_GPIO_REG + set,
+ sizeof(tmp), tmp);
+ if (status) {
+ mutex_unlock(&priv->lock);
+ return status;
+ }
+
+ mutex_unlock(&priv->lock);
+
+ if (tmp[0] & mask)
+ return GPIOF_DIR_IN;
+
+ return GPIOF_DIR_OUT;
+}
+
+static int f81534a_prepare_gpio(struct usb_interface *intf)
+{
+ struct f81534a_ctrl_private *priv = usb_get_intfdata(intf);
+ int status;
+
+ priv->chip.parent = &intf->dev;
+ priv->chip.owner = THIS_MODULE;
+ priv->chip.get_direction = f81534a_gpio_get_direction,
+ priv->chip.get = f81534a_gpio_get;
+ priv->chip.direction_input = f81534a_gpio_direction_in;
+ priv->chip.set = f81534a_gpio_set;
+ priv->chip.direction_output = f81534a_gpio_direction_out;
+ priv->chip.label = "f81534a";
+ /* M0(SD)/M1/M2 */
+ priv->chip.ngpio = F81534A_CTRL_GPIO_MAX_PIN * F81534A_MAX_PORT;
+ priv->chip.base = -1;
+
+ priv->intf = intf;
+ mutex_init(&priv->lock);
+
+ status = devm_gpiochip_add_data(&intf->dev, &priv->chip, priv);
+ if (status) {
+ dev_err(&intf->dev, "%s: failed: %d\n", __func__, status);
+ return status;
+ }
+
+ return 0;
+}
+#else
+static int f81534a_prepare_gpio(struct usb_interface *intf)
+{
+ dev_warn(&intf->dev, "CONFIG_GPIOLIB is not enabled\n");
+ dev_warn(&intf->dev, "The GPIOLIB interface will not register\n");
+
+ return 0;
+}
+#endif
+
+static int f81534a_release_gpio(struct usb_interface *intf)
+{
+ return 0;
+}
+
static int f81534a_ctrl_generate_ports(struct usb_interface *intf,
struct f81534a_device *device)
{
@@ -1118,6 +1318,7 @@ static int f81534a_ctrl_probe(struct usb_interface *intf,
struct usb_device *dev = interface_to_usbdev(intf);
struct f81534a_ctrl_private *priv;
struct f81534a_device *device;
+ int status;
priv = devm_kzalloc(&intf->dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
@@ -1130,6 +1331,10 @@ static int f81534a_ctrl_probe(struct usb_interface *intf,
mutex_init(&priv->lock);
usb_set_intfdata(intf, priv);
+ status = f81534a_prepare_gpio(intf);
+ if (status)
+ return status;
+
INIT_LIST_HEAD(&device->list);
device->intf = intf;
@@ -1158,6 +1363,11 @@ static void f81534a_ctrl_disconnect(struct usb_interface *intf)
priv = usb_get_intfdata(intf);
dev = interface_to_usbdev(intf);
+
+ mutex_lock(&priv->lock);
+ f81534a_release_gpio(intf);
+ mutex_unlock(&priv->lock);
+
usb_put_dev(dev);
break;
}
--
2.7.4
