mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2026-08-09 06:14:34 +02:00
Uwe Kleine-König (The Capable Hub)andGreg Kroah-Hartman
555f100cb8
While being less compact, using named initializers allows to more easily see which members of the structs are assigned which value without having to lookup the declaration of the struct. And it's also more robust against changes to the struct definition. While touching all these arrays, unify usage of whitespace in the list terminator. This patch doesn't modify the compiled arrays, only their representation in source form benefits. The former was confirmed with x86 and arm64 builds. Signed-off-by: Uwe Kleine-König (The Capable Hub) <u.kleine-koenig@baylibre.com> Reviewed-by: Richard Leitner <richard.leitner@linux.dev> Link: https://patch.msgid.link/20260518135536.781168-2-u.kleine-koenig@baylibre.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
164 lines
3.4 KiB
C
164 lines
3.4 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* Driver for SMSC USB4604 USB HSIC 4-port 2.0 hub controller driver
|
|
* Based on usb3503 driver
|
|
*
|
|
* Copyright (c) 2012-2013 Dongjin Kim (tobetter@gmail.com)
|
|
* Copyright (c) 2016 Linaro Ltd.
|
|
*/
|
|
|
|
#include <linux/i2c.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/module.h>
|
|
#include <linux/gpio/consumer.h>
|
|
|
|
enum usb4604_mode {
|
|
USB4604_MODE_UNKNOWN,
|
|
USB4604_MODE_HUB,
|
|
USB4604_MODE_STANDBY,
|
|
};
|
|
|
|
struct usb4604 {
|
|
enum usb4604_mode mode;
|
|
struct device *dev;
|
|
struct gpio_desc *gpio_reset;
|
|
};
|
|
|
|
static void usb4604_reset(struct usb4604 *hub, int state)
|
|
{
|
|
gpiod_set_value_cansleep(hub->gpio_reset, state);
|
|
|
|
/* Wait for i2c logic to come up */
|
|
if (state)
|
|
msleep(250);
|
|
}
|
|
|
|
static int usb4604_connect(struct usb4604 *hub)
|
|
{
|
|
struct device *dev = hub->dev;
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
int err;
|
|
u8 connect_cmd[] = { 0xaa, 0x55, 0x00 };
|
|
|
|
usb4604_reset(hub, 1);
|
|
|
|
err = i2c_master_send(client, connect_cmd, ARRAY_SIZE(connect_cmd));
|
|
if (err < 0) {
|
|
usb4604_reset(hub, 0);
|
|
return err;
|
|
}
|
|
|
|
hub->mode = USB4604_MODE_HUB;
|
|
dev_dbg(dev, "switched to HUB mode\n");
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int usb4604_switch_mode(struct usb4604 *hub, enum usb4604_mode mode)
|
|
{
|
|
struct device *dev = hub->dev;
|
|
int err = 0;
|
|
|
|
switch (mode) {
|
|
case USB4604_MODE_HUB:
|
|
err = usb4604_connect(hub);
|
|
break;
|
|
|
|
case USB4604_MODE_STANDBY:
|
|
usb4604_reset(hub, 0);
|
|
dev_dbg(dev, "switched to STANDBY mode\n");
|
|
break;
|
|
|
|
default:
|
|
dev_err(dev, "unknown mode is requested\n");
|
|
err = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static int usb4604_probe(struct usb4604 *hub)
|
|
{
|
|
struct device *dev = hub->dev;
|
|
struct device_node *np = dev->of_node;
|
|
struct gpio_desc *gpio;
|
|
u32 mode = USB4604_MODE_HUB;
|
|
|
|
gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
|
|
if (IS_ERR(gpio))
|
|
return PTR_ERR(gpio);
|
|
hub->gpio_reset = gpio;
|
|
|
|
if (of_property_read_u32(np, "initial-mode", &hub->mode))
|
|
hub->mode = mode;
|
|
|
|
return usb4604_switch_mode(hub, hub->mode);
|
|
}
|
|
|
|
static int usb4604_i2c_probe(struct i2c_client *i2c)
|
|
{
|
|
struct usb4604 *hub;
|
|
|
|
hub = devm_kzalloc(&i2c->dev, sizeof(*hub), GFP_KERNEL);
|
|
if (!hub)
|
|
return -ENOMEM;
|
|
|
|
i2c_set_clientdata(i2c, hub);
|
|
hub->dev = &i2c->dev;
|
|
|
|
return usb4604_probe(hub);
|
|
}
|
|
|
|
static int __maybe_unused usb4604_i2c_suspend(struct device *dev)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
struct usb4604 *hub = i2c_get_clientdata(client);
|
|
|
|
usb4604_switch_mode(hub, USB4604_MODE_STANDBY);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __maybe_unused usb4604_i2c_resume(struct device *dev)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
struct usb4604 *hub = i2c_get_clientdata(client);
|
|
|
|
usb4604_switch_mode(hub, hub->mode);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static SIMPLE_DEV_PM_OPS(usb4604_i2c_pm_ops, usb4604_i2c_suspend,
|
|
usb4604_i2c_resume);
|
|
|
|
static const struct i2c_device_id usb4604_id[] = {
|
|
{ .name = "usb4604" },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, usb4604_id);
|
|
|
|
#ifdef CONFIG_OF
|
|
static const struct of_device_id usb4604_of_match[] = {
|
|
{ .compatible = "smsc,usb4604" },
|
|
{}
|
|
};
|
|
MODULE_DEVICE_TABLE(of, usb4604_of_match);
|
|
#endif
|
|
|
|
static struct i2c_driver usb4604_i2c_driver = {
|
|
.driver = {
|
|
.name = "usb4604",
|
|
.pm = pm_ptr(&usb4604_i2c_pm_ops),
|
|
.of_match_table = of_match_ptr(usb4604_of_match),
|
|
},
|
|
.probe = usb4604_i2c_probe,
|
|
.id_table = usb4604_id,
|
|
};
|
|
module_i2c_driver(usb4604_i2c_driver);
|
|
|
|
MODULE_DESCRIPTION("USB4604 USB HUB driver");
|
|
MODULE_LICENSE("GPL v2");
|