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5d62afbe95
Now that the SPDX tag is in all USB files, that identifies the license in a specific and legally-defined manner. So the extra GPL text wording can be removed as it is no longer needed at all. This is done on a quest to remove the 700+ different ways that files in the kernel describe the GPL license text. And there's unneeded stuff like the address (sometimes incorrect) for the FSF which is never needed. No copyright headers or other non-license-description text was removed. Cc: Keith Packard <keithp@keithp.com> Cc: Juergen Stuber <starblue@users.sourceforge.net> Cc: Cesar Miquel <miquel@df.uba.ar> Cc: Richard Leitner <richard.leitner@skidata.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
167 lines
3.4 KiB
C
167 lines
3.4 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Driver for SMSC USB4604 USB HSIC 4-port 2.0 hub controller driver
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* Based on usb3503 driver
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*
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* Copyright (c) 2012-2013 Dongjin Kim (tobetter@gmail.com)
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* Copyright (c) 2016 Linaro Ltd.
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*/
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#include <linux/i2c.h>
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#include <linux/delay.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/gpio/consumer.h>
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enum usb4604_mode {
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USB4604_MODE_UNKNOWN,
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USB4604_MODE_HUB,
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USB4604_MODE_STANDBY,
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};
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struct usb4604 {
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enum usb4604_mode mode;
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struct device *dev;
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struct gpio_desc *gpio_reset;
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};
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static void usb4604_reset(struct usb4604 *hub, int state)
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{
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gpiod_set_value_cansleep(hub->gpio_reset, state);
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/* Wait for i2c logic to come up */
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if (state)
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msleep(250);
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}
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static int usb4604_connect(struct usb4604 *hub)
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{
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struct device *dev = hub->dev;
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struct i2c_client *client = to_i2c_client(dev);
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int err;
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u8 connect_cmd[] = { 0xaa, 0x55, 0x00 };
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usb4604_reset(hub, 1);
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err = i2c_master_send(client, connect_cmd, ARRAY_SIZE(connect_cmd));
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if (err < 0) {
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usb4604_reset(hub, 0);
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return err;
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}
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hub->mode = USB4604_MODE_HUB;
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dev_dbg(dev, "switched to HUB mode\n");
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return 0;
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}
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static int usb4604_switch_mode(struct usb4604 *hub, enum usb4604_mode mode)
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{
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struct device *dev = hub->dev;
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int err = 0;
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switch (mode) {
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case USB4604_MODE_HUB:
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err = usb4604_connect(hub);
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break;
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case USB4604_MODE_STANDBY:
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usb4604_reset(hub, 0);
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dev_dbg(dev, "switched to STANDBY mode\n");
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break;
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default:
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dev_err(dev, "unknown mode is requested\n");
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err = -EINVAL;
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break;
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}
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return err;
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}
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static int usb4604_probe(struct usb4604 *hub)
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{
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struct device *dev = hub->dev;
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struct device_node *np = dev->of_node;
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struct gpio_desc *gpio;
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u32 mode = USB4604_MODE_HUB;
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gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
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if (IS_ERR(gpio))
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return PTR_ERR(gpio);
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hub->gpio_reset = gpio;
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if (of_property_read_u32(np, "initial-mode", &hub->mode))
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hub->mode = mode;
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return usb4604_switch_mode(hub, hub->mode);
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}
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static int usb4604_i2c_probe(struct i2c_client *i2c,
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const struct i2c_device_id *id)
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{
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struct usb4604 *hub;
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hub = devm_kzalloc(&i2c->dev, sizeof(*hub), GFP_KERNEL);
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if (!hub)
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return -ENOMEM;
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i2c_set_clientdata(i2c, hub);
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hub->dev = &i2c->dev;
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return usb4604_probe(hub);
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}
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#ifdef CONFIG_PM_SLEEP
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static int usb4604_i2c_suspend(struct device *dev)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct usb4604 *hub = i2c_get_clientdata(client);
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usb4604_switch_mode(hub, USB4604_MODE_STANDBY);
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return 0;
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}
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static int usb4604_i2c_resume(struct device *dev)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct usb4604 *hub = i2c_get_clientdata(client);
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usb4604_switch_mode(hub, hub->mode);
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return 0;
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}
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#endif
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static SIMPLE_DEV_PM_OPS(usb4604_i2c_pm_ops, usb4604_i2c_suspend,
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usb4604_i2c_resume);
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static const struct i2c_device_id usb4604_id[] = {
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{ "usb4604", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, usb4604_id);
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#ifdef CONFIG_OF
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static const struct of_device_id usb4604_of_match[] = {
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{ .compatible = "smsc,usb4604" },
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{}
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};
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MODULE_DEVICE_TABLE(of, usb4604_of_match);
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#endif
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static struct i2c_driver usb4604_i2c_driver = {
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.driver = {
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.name = "usb4604",
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.pm = &usb4604_i2c_pm_ops,
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.of_match_table = of_match_ptr(usb4604_of_match),
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},
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.probe = usb4604_i2c_probe,
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.id_table = usb4604_id,
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};
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module_i2c_driver(usb4604_i2c_driver);
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MODULE_DESCRIPTION("USB4604 USB HUB driver");
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MODULE_LICENSE("GPL v2");
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