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/* Copyright (c) 2017, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/of_gpio.h>
#include <linux/of_platform.h>
#include <linux/interrupt.h>
#include <linux/regulator/consumer.h>
#include <linux/usb/class-dual-role.h>
#include <linux/usb.h>
#include <linux/usb/msm_hsusb.h>
#define USB_HUB_I2C_NAME "usb2533-flex-hub"
static u8 write_connect_cfg[] = {0x00, 0x00, 0x05, 0x00, 0x02,
0x31, 0x8E, 0x83};
static u8 conf_access[] = {0x99, 0x37, 0x00};
static u8 read_connect_cfg[] = {0x00, 0x00, 0x04, 0x01, 0x01, 0x31, 0x8E};
static u8 read_cmd[] = {0x00, 0x04};
static u8 usb_attach[] = {0xAA, 0x55, 0x00};
struct flex_hub {
struct i2c_client *client;
struct device *dev;
struct regulator *vbus_det;
struct notifier_block usbdev_nb;
int hub_reset_gpio;
int usbeth_reset_gpio;
};
static struct flex_hub *usb_hub;
static int hub_read_regdata(struct i2c_client *i2c)
{
int rc;
u8 data[3];
struct i2c_msg msgs[] = {
{
.addr = i2c->addr,
.flags = I2C_M_RD,
.len = 3,
.buf = data,
}
};
rc = i2c_transfer(i2c->adapter, msgs, 1);
if (rc < 0) {
dev_dbg(&i2c->dev, "i2c read from 0x%x failed %d\n",
i2c->addr, rc);
return -ENXIO;
}
return rc;
}
static int hub_i2c_write(struct flex_hub *usb_hub, u8 *data, int len)
{
int ret;
struct i2c_msg msgs[] = {
{
.addr = usb_hub->client->addr,
.flags = 0,
.len = len,
.buf = data,
}
};
ret = i2c_transfer(usb_hub->client->adapter, msgs, 1);
if (ret != 1) {
pr_err("i2c write to [%x] failed %d\n",
usb_hub->client->addr, ret);
return -EIO;
}
return 0;
}
int i2c_hub_attach(void)
{
if (hub_i2c_write(usb_hub, usb_attach, sizeof(usb_attach))) {
pr_err("%s usb_attach failed\n", __func__);
return -EIO;
}
return 0;
}
EXPORT_SYMBOL(i2c_hub_attach);
int i2c_hub_flex_enable(struct flex_hub *usb_hub)
{
int ret;
if (hub_i2c_write(usb_hub, write_connect_cfg,
sizeof(write_connect_cfg))) {
pr_err("%s write_connect_cfg cmd failed\n", __func__);
return -EIO;
}
if (hub_i2c_write(usb_hub, conf_access, sizeof(conf_access))) {
pr_err("%s conf_access cmd failed\n", __func__);
return -EIO;
}
if (hub_i2c_write(usb_hub, read_connect_cfg,
sizeof(read_connect_cfg))) {
pr_err("%s read_connect cmd failed\n", __func__);
return -EIO;
}
if (hub_i2c_write(usb_hub, conf_access, sizeof(conf_access))) {
pr_err("%s conf_access cmd failed\n", __func__);
return -EIO;
}
if (hub_i2c_write(usb_hub, read_cmd, sizeof(read_cmd))) {
pr_err("%s read_cmd failed\n", __func__);
return -EIO;
}
ret = hub_read_regdata(usb_hub->client);
if (ret < 0) {
pr_err("read_regdata failed\n");
return -EIO;
}
/*
* After the read/write of USB2533 HUB's configuration register,
* We need to wait for 300ms before doing USB_ATTACH(special command).
*/
msleep(300);
if (hub_i2c_write(usb_hub, usb_attach, sizeof(usb_attach))) {
pr_err("%s usb_attach cmd failed\n", __func__);
return -EIO;
}
return 0;
}
EXPORT_SYMBOL(i2c_hub_flex_enable);
static int flex_hub_usbdev_notify(struct notifier_block *self,
unsigned long action, void *priv)
{
static bool flex_enabled;
pr_debug("%s: action:%lu flex:%d\n", __func__, action, flex_enabled);
if (action != USB_BUS_ADD && action != USB_BUS_REMOVE)
return 0;
switch (action) {
case USB_BUS_ADD:
if (flex_enabled) {
pr_debug("%s: already flexconnect enabled\n", __func__);
break;
}
if (gpio_is_valid(usb_hub->hub_reset_gpio)) {
gpio_direction_output(
usb_hub->hub_reset_gpio, 0);
/* 5 microsecs reset signaling to hub */
usleep_range(5, 10);
gpio_direction_output(
usb_hub->hub_reset_gpio, 1);
}
/*
* After HUB reset, 300ms delay is required in
* SOC config stage before doing any i2c access.
*/
msleep(300);
if (gpio_is_valid(usb_hub->usbeth_reset_gpio)) {
gpio_direction_output(
usb_hub->usbeth_reset_gpio, 0);
/* 100 microsecs reset signaling to LAN7500 */
usleep_range(100, 110);
gpio_direction_output(
usb_hub->usbeth_reset_gpio, 1);
}
i2c_hub_flex_enable(usb_hub);
flex_enabled = true;
break;
case USB_BUS_REMOVE:
if (!flex_enabled) {
pr_debug("%s: already flexconnect disabled\n",
__func__);
break;
}
if (gpio_is_valid(usb_hub->hub_reset_gpio)) {
gpio_direction_output(
usb_hub->hub_reset_gpio, 0);
/* 5 microsecs reset signaling to usb hub */
usleep_range(5, 10);
gpio_direction_output(
usb_hub->hub_reset_gpio, 1);
}
msleep(300);
i2c_hub_attach();
flex_enabled = false;
break;
default:
break;
}
return 0;
}
static int usb2533_probe(struct i2c_client *i2c,
const struct i2c_device_id *id)
{
int ret = 0;
struct device_node *node = i2c->dev.of_node;
usb_hub = devm_kzalloc(&i2c->dev, sizeof(struct flex_hub),
GFP_KERNEL);
if (!usb_hub)
return -ENOMEM;
i2c_set_clientdata(i2c, usb_hub);
usb_hub->client = i2c;
usb_hub->dev = &usb_hub->client->dev;
usb_hub->vbus_det = devm_regulator_get(usb_hub->dev, "vbus");
if (IS_ERR(usb_hub->vbus_det)) {
dev_err(usb_hub->dev, "Failed to get regulator: %ld\n",
PTR_ERR(usb_hub->vbus_det));
return PTR_ERR(usb_hub->vbus_det);
}
ret = regulator_enable(usb_hub->vbus_det);
if (ret) {
pr_err("unable to enable vbus_det\n");
return ret;
}
usb_hub->hub_reset_gpio = of_get_named_gpio(
node, "qcom,hub-reset-gpio", 0);
if (usb_hub->hub_reset_gpio < 0)
pr_debug("hub_reset_gpio is not available\n");
usb_hub->usbeth_reset_gpio = of_get_named_gpio(
node, "qcom,usbeth-reset-gpio", 0);
if (usb_hub->usbeth_reset_gpio < 0)
pr_debug("usbeth_reset_gpio is not available\n");
if (gpio_is_valid(usb_hub->hub_reset_gpio)) {
ret = devm_gpio_request(usb_hub->dev,
usb_hub->hub_reset_gpio, "HUB_RESET");
if (ret < 0) {
dev_err(usb_hub->dev, "gpio req failed for hub_reset\n");
return ret;
}
}
if (gpio_is_valid(usb_hub->usbeth_reset_gpio)) {
ret = devm_gpio_request(usb_hub->dev,
usb_hub->usbeth_reset_gpio, "ETH_RESET");
if (ret < 0) {
dev_err(usb_hub->dev, "gpio req failed for usbeth_reset\n");
return ret;
}
}
usb_hub->usbdev_nb.notifier_call = flex_hub_usbdev_notify;
usb_register_notify(&usb_hub->usbdev_nb);
return 0;
}
static int usb2533_remove(struct i2c_client *i2c)
{
struct flex_hub *usb_hub = i2c_get_clientdata(i2c);
usb_unregister_notify(&usb_hub->usbdev_nb);
devm_kfree(&i2c->dev, usb_hub);
return 0;
}
static const struct i2c_device_id usb2533_flex_hub_id[] = {
{ USB_HUB_I2C_NAME, 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, flex_hub_id);
static const struct of_device_id flex_hub_of_match[] = {
{ .compatible = "qcom,usb2533-flex-hub", },
{},
};
MODULE_DEVICE_TABLE(of, flex_hub_of_match);
static struct i2c_driver flex_hub_driver = {
.probe = usb2533_probe,
.remove = usb2533_remove,
.id_table = usb2533_flex_hub_id,
.driver = {
.name = USB_HUB_I2C_NAME,
.of_match_table = flex_hub_of_match,
},
};
module_i2c_driver(flex_hub_driver);
MODULE_DESCRIPTION("Microchip USB2533 Flex Hub driver");
MODULE_LICENSE("GPL v2");
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