Commit 69a0c69a authored by Serge Semin's avatar Serge Semin Committed by Greg Kroah-Hartman
Browse files

usb: usb251xb: Use GPIO descriptor consumer interface 



The driver used to be developed with legacy GPIO API support. It's
better to use descriptor-based interface for several reasons. First
of all the legacy API doesn't support the ACTIVE_LOW/HIGH flag of dts
nodes, which is essential since different hardware may have different
GPIOs connectivity including the logical value inversion. Secondly,
by requesting the reset GPIO descriptor the driver prevent the other
applications from changing its value. And last but not least the
legacy GPIO interface should be avoided in the new code due to it
obsolescence.

Signed-off-by: default avatarSerge Semin <fancer.lancer@gmail.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 4ed466ae

drivers/usb/misc/usb251xb.c

+13 −20
Original line number Diff line number Diff line
@@ -20,12 +20,11 @@ 
 */



#include <linux/delay.h>

#include <linux/gpio.h>

#include <linux/gpio/consumer.h>

#include <linux/i2c.h>

#include <linux/module.h>

#include <linux/nls.h>

#include <linux/of_device.h>

#include <linux/of_gpio.h>

#include <linux/slab.h>



/* Internal Register Set Addresses & Default Values acc. to DS00001692C */
@@ -126,7 +125,7 @@ struct usb251xb { 
	struct device *dev;

	struct i2c_client *i2c;

	u8 skip_config;

	int gpio_reset;

	struct gpio_desc *gpio_reset;

	u16 vendor_id;

	u16 product_id;

	u16 device_id;
@@ -234,13 +233,13 @@ static const struct usb251xb_data usb2517i_data = { 


static void usb251xb_reset(struct usb251xb *hub, int state)

{

	if (!gpio_is_valid(hub->gpio_reset))

	if (!hub->gpio_reset)

		return;



	gpio_set_value_cansleep(hub->gpio_reset, state);

	gpiod_set_value_cansleep(hub->gpio_reset, state);



	/* wait for hub recovery/stabilization */

	if (state)

	if (!state)

		usleep_range(500, 750);	/* >=500us at power on */

	else

		usleep_range(1, 10);	/* >=1us at power down */
@@ -259,7 +258,7 @@ static int usb251xb_connect(struct usb251xb *hub) 
		i2c_wb[0] = 0x01;

		i2c_wb[1] = USB251XB_STATUS_COMMAND_ATTACH;



		usb251xb_reset(hub, 1);

		usb251xb_reset(hub, 0);



		err = i2c_smbus_write_i2c_block_data(hub->i2c,

				USB251XB_ADDR_STATUS_COMMAND, 2, i2c_wb);
@@ -309,7 +308,7 @@ static int usb251xb_connect(struct usb251xb *hub) 
	i2c_wb[USB251XB_ADDR_PORT_MAP_7]        = hub->port_map7;

	i2c_wb[USB251XB_ADDR_STATUS_COMMAND] = USB251XB_STATUS_COMMAND_ATTACH;



	usb251xb_reset(hub, 1);

	usb251xb_reset(hub, 0);



	/* write registers */

	for (i = 0; i < (USB251XB_I2C_REG_SZ / USB251XB_I2C_WRITE_SZ); i++) {
@@ -362,20 +361,14 @@ static int usb251xb_get_ofdata(struct usb251xb *hub, 
	else

		hub->skip_config = 0;



	hub->gpio_reset = of_get_named_gpio(np, "reset-gpios", 0);

	if (hub->gpio_reset == -EPROBE_DEFER)

	hub->gpio_reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);

	if (PTR_ERR(hub->gpio_reset) == -EPROBE_DEFER) {

		return -EPROBE_DEFER;

	if (gpio_is_valid(hub->gpio_reset)) {

		err = devm_gpio_request_one(dev, hub->gpio_reset,

					    GPIOF_OUT_INIT_LOW,

					    "usb251xb reset");

		if (err) {

			dev_err(dev,

				"unable to request GPIO %d as reset pin (%d)\n",

				hub->gpio_reset, err);

	} else if (IS_ERR(hub->gpio_reset)) {

		err = PTR_ERR(hub->gpio_reset);

		dev_err(dev, "unable to request GPIO reset pin (%d)\n", err);

		return err;

	}

	}



	if (of_property_read_u16_array(np, "vendor-id", &hub->vendor_id, 1))

		hub->vendor_id = USB251XB_DEF_VENDOR_ID;

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