[PATCH] gpio:gpio-pl2303: add gpio driver for GPIOs on PL2303
From: Wang YanQing
Date: Sat Jul 19 2014 - 20:02:40 EST
PL2303HX has two GPIOs, this patch add driver for it.
Signed-off-by: Wang YanQing <udknight@xxxxxxxxx>
---
MAINTAINERS | 5 +
drivers/gpio/Kconfig | 7 ++
drivers/gpio/Makefile | 1 +
drivers/gpio/gpio-pl2303.c | 238 ++++++++++++++++++++++++++++++++++++++++++++
drivers/usb/serial/pl2303.c | 19 ++++
5 files changed, 270 insertions(+)
create mode 100644 drivers/gpio/gpio-pl2303.c
diff --git a/MAINTAINERS b/MAINTAINERS
index 53feaaf..4a9d764 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -6903,6 +6903,11 @@ F: drivers/i2c/busses/i2c-puv3.c
F: drivers/video/fb-puv3.c
F: drivers/rtc/rtc-puv3.c
+PL2303 GPIO DRIVER
+M: Wang YanQing <udknight@xxxxxxxxx>
+S: Maintained
+F: drivers/gpio/gpio-pl2303.c
+
PMBUS HARDWARE MONITORING DRIVERS
M: Guenter Roeck <linux@xxxxxxxxxxxx>
L: lm-sensors@xxxxxxxxxxxxxx
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 4a1b511..0f90950 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -110,6 +110,13 @@ config GPIO_DA9055
config GPIO_MAX730X
tristate
+config GPIO_PL2303
+ tristate "USB Prolific 2303 gpio support"
+ depends on USB_SERIAL_PL2303
+ help
+ Enable support for GPIOs on USB Prolific 2303
+ It support two GPIOs on PL2303HX currently.
+
comment "Memory mapped GPIO drivers:"
config GPIO_CLPS711X
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index d10f6a9..4ff59f6 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -101,3 +101,4 @@ obj-$(CONFIG_GPIO_WM8994) += gpio-wm8994.o
obj-$(CONFIG_GPIO_XILINX) += gpio-xilinx.o
obj-$(CONFIG_GPIO_XTENSA) += gpio-xtensa.o
obj-$(CONFIG_GPIO_ZEVIO) += gpio-zevio.o
+obj-$(CONFIG_GPIO_PL2303) += gpio-pl2303.o
diff --git a/drivers/gpio/gpio-pl2303.c b/drivers/gpio/gpio-pl2303.c
new file mode 100644
index 0000000..a703440
--- /dev/null
+++ b/drivers/gpio/gpio-pl2303.c
@@ -0,0 +1,238 @@
+/*
+ * PL2303 GPIO driver
+ *
+ * Copyright (C) 2014 Wang YanQing <udknight@xxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * Check pl2303.c for further details.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/usb.h>
+#include <linux/gpio.h>
+
+#define VENDOR_READ_REQUEST_TYPE 0xc0
+#define VENDOR_READ_REQUEST 0x01
+
+#define VENDOR_WRITE_REQUEST_TYPE 0x40
+#define VENDOR_WRITE_REQUEST 0x01
+
+struct pl2303_gpio_data {
+ struct usb_device *pl2303;
+ /*
+ * 0..3: unknown (zero)
+ * 4: gp0 output enable (1: gp0 pin is output, 0: gp0 pin is input)
+ * 5: gp1 output enable (1: gp1 pin is output, 0: gp1 pin is input)
+ * 6: gp0 pin value
+ * 7: gp1 pin value
+ */
+ u8 index;
+ struct gpio_chip gpio_chip;
+};
+
+static inline struct pl2303_gpio_data *to_pl2303_gpio(struct gpio_chip *chip)
+{
+ return container_of(chip, struct pl2303_gpio_data, gpio_chip);
+}
+
+static int pl2303_gpio_read(struct gpio_chip *chip, unsigned char buf[1])
+{
+ struct pl2303_gpio_data *pl2303_gpio = to_pl2303_gpio(chip);
+ struct usb_device *pl2303 = pl2303_gpio->pl2303;
+ struct device *dev = chip->dev;
+ int res;
+
+ res = usb_control_msg(pl2303, usb_rcvctrlpipe(pl2303, 0),
+ VENDOR_READ_REQUEST, VENDOR_READ_REQUEST_TYPE,
+ 0x0081, 0, buf, 1, 100);
+ if (res != 1) {
+ dev_err(dev, "%s - failed to read [%04x]: %d\n", __func__,
+ 0x0081, res);
+ if (res >= 0)
+ res = -EIO;
+
+ return res;
+ }
+
+ dev_dbg(dev, "%s - [%04x] = %02x\n", __func__, 0x0081, buf[0]);
+
+ return 0;
+}
+
+static int pl2303_gpio_write(struct gpio_chip *chip)
+{
+ struct pl2303_gpio_data *pl2303_gpio = to_pl2303_gpio(chip);
+ struct usb_device *pl2303 = pl2303_gpio->pl2303;
+ struct device *dev = chip->dev;
+ int res;
+
+ dev_dbg(dev, "%s - [%04x] = %02x\n", __func__, 1, pl2303_gpio->index);
+
+ res = usb_control_msg(pl2303, usb_sndctrlpipe(pl2303, 0),
+ VENDOR_WRITE_REQUEST, VENDOR_WRITE_REQUEST_TYPE,
+ 1, pl2303_gpio->index, NULL, 0, 100);
+ if (res) {
+ dev_err(dev, "%s - failed to write [%04x] = %02x: %d\n", __func__,
+ 1, pl2303_gpio->index, res);
+ return res;
+ }
+
+ return 0;
+}
+
+static int pl2303_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
+{
+ struct pl2303_gpio_data *pl2303_gpio = to_pl2303_gpio(chip);
+
+ if (offset == 0)
+ pl2303_gpio->index &= ~0x10;
+ else if (offset == 1)
+ pl2303_gpio->index &= ~0x20;
+ else
+ return -EINVAL;
+
+ pl2303_gpio_write(chip);
+ return 0;
+}
+
+static int pl2303_gpio_direction_out(struct gpio_chip *chip, unsigned offset, int value)
+{
+ struct pl2303_gpio_data *pl2303_gpio = to_pl2303_gpio(chip);
+
+ if (offset == 0) {
+ pl2303_gpio->index |= 0x10;
+ if (value)
+ pl2303_gpio->index |= 0x40;
+ else
+ pl2303_gpio->index &= ~0x40;
+ } else if (offset == 1) {
+ pl2303_gpio->index |= 0x20;
+ if (value)
+ pl2303_gpio->index |= 0x80;
+ else
+ pl2303_gpio->index &= ~0x80;
+ } else {
+ return -EINVAL;
+ }
+
+ pl2303_gpio_write(chip);
+ return 0;
+}
+
+static void pl2303_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
+{
+ struct pl2303_gpio_data *pl2303_gpio = to_pl2303_gpio(chip);
+
+ if (offset == 0) {
+ if (value)
+ pl2303_gpio->index |= 0x40;
+ else
+ pl2303_gpio->index &= ~0x40;
+ } else if (offset == 1) {
+ if (value)
+ pl2303_gpio->index |= 0x80;
+ else
+ pl2303_gpio->index &= ~0x80;
+ } else {
+ return;
+ }
+
+ pl2303_gpio_write(chip);
+}
+
+static int pl2303_gpio_get(struct gpio_chip *chip, unsigned offset)
+{
+ unsigned char buf[1];
+ int value = 0;
+
+ if(pl2303_gpio_read(chip, buf) < 1)
+ return -EIO;
+ if (offset == 0)
+ value = buf[0] & 0x40;
+ else if (offset == 1)
+ value = buf[0] & 0x80;
+ else
+ return -EINVAL;
+ return value;
+}
+
+static struct gpio_chip template_chip = {
+ .label = "pl2303-gpio",
+ .owner = THIS_MODULE,
+ .direction_input = pl2303_gpio_direction_in,
+ .get = pl2303_gpio_get,
+ .direction_output = pl2303_gpio_direction_out,
+ .set = pl2303_gpio_set,
+ .can_sleep = 1,
+};
+
+static int pl2303_gpio_probe(struct platform_device *pdev)
+{
+ struct usb_device *pl2303 = platform_get_drvdata(pdev);
+ struct pl2303_gpio_data *pl2303_gpio;
+ int ret;
+
+ pl2303_gpio = kzalloc(sizeof(*pl2303_gpio), GFP_KERNEL);
+ if (pl2303_gpio == NULL)
+ return -ENOMEM;
+
+ /* initialize gpio0,gpio1 for input as default*/
+ pl2303_gpio->index = 0x00;
+ pl2303_gpio->pl2303 = pl2303;
+ pl2303_gpio->gpio_chip = template_chip;
+ pl2303_gpio->gpio_chip.ngpio = 2;
+ pl2303_gpio->gpio_chip.base = -1;
+ pl2303_gpio->gpio_chip.dev = &pdev->dev;
+ pl2303_gpio_write(&pl2303_gpio->gpio_chip);
+
+ ret = gpiochip_add(&pl2303_gpio->gpio_chip);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
+ return ret;
+ }
+ platform_set_drvdata(pdev, pl2303_gpio);
+
+ return ret;
+}
+
+static int pl2303_gpio_remove(struct platform_device *pdev)
+{
+ struct pl2303_gpio_data *pl2303_gpio = platform_get_drvdata(pdev);
+
+ if (gpiochip_remove(&pl2303_gpio->gpio_chip))
+ dev_err(&pdev->dev, "unable to remove gpio_chip?\n");
+ platform_set_drvdata(pdev, NULL);
+ kfree(pl2303_gpio);
+ return 0;
+}
+
+static struct platform_driver pl2303_gpio_driver = {
+ .driver.name = "pl2303-gpio",
+ .driver.owner = THIS_MODULE,
+ .probe = pl2303_gpio_probe,
+ .remove = pl2303_gpio_remove,
+};
+
+static int __init pl2303_gpio_init(void)
+{
+ return platform_driver_register(&pl2303_gpio_driver);
+}
+module_init(pl2303_gpio_init);
+
+static void __exit pl2303_gpio_exit(void)
+{
+ platform_driver_unregister(&pl2303_gpio_driver);
+}
+module_exit(pl2303_gpio_exit);
+
+MODULE_AUTHOR("Wang YanQing <udknight@xxxxxxxxx>");
+MODULE_DESCRIPTION("GPIO driver for PL2303");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("platform:pl2303-gpio");
diff --git a/drivers/usb/serial/pl2303.c b/drivers/usb/serial/pl2303.c
index b3d5a35..1bb8928 100644
--- a/drivers/usb/serial/pl2303.c
+++ b/drivers/usb/serial/pl2303.c
@@ -28,6 +28,7 @@
#include <linux/usb.h>
#include <linux/usb/serial.h>
#include <asm/unaligned.h>
+#include <linux/platform_device.h>
#include "pl2303.h"
@@ -146,6 +147,7 @@ struct pl2303_type_data {
struct pl2303_serial_private {
const struct pl2303_type_data *type;
unsigned long quirks;
+ struct platform_device *pdev;
};
struct pl2303_private {
@@ -261,7 +263,22 @@ static int pl2303_startup(struct usb_serial *serial)
pl2303_vendor_write(serial, 2, 0x44);
kfree(buf);
+ if (type != TYPE_HX)
+ return 0;
+ spriv->pdev = platform_device_alloc("pl2303-gpio", PLATFORM_DEVID_AUTO);
+ if (spriv->pdev == NULL) {
+ dev_err(&serial->interface->dev, "Failed to allocate %s\n", "pl2303-gpio");
+ } else {
+ spriv->pdev->dev.parent = &serial->interface->dev;
+ platform_set_drvdata(spriv->pdev, serial->dev);
+ platform_device_add(spriv->pdev);
+ if (platform_device_add(spriv->pdev) != 0) {
+ dev_err(&serial->interface->dev, "Failed to register %s\n", "pl2303-gpio");
+ platform_device_put(spriv->pdev);
+ spriv->pdev = NULL;
+ }
+ }
return 0;
}
@@ -269,6 +286,8 @@ static void pl2303_release(struct usb_serial *serial)
{
struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
+ if (spriv && spriv->pdev)
+ platform_device_unregister(spriv->pdev);
kfree(spriv);
}
--
1.8.5.5.dirty
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