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/* Copyright (c) 2013-2014, 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/module.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/gpio.h>
#include <linux/interrupt.h>
#include <linux/notifier.h>
#include <linux/platform_device.h>
#include <linux/pm_wakeup.h>
#include <linux/workqueue.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/of_gpio.h>
#include <soc/qcom/liquid_dock.h>
static int docked;
static BLOCKING_NOTIFIER_HEAD(dock_notifier_list);
/**
* register_liquid_dock_notify - register dock notifier callback
* @nb: pointer to the notifier block for the callback events.
*
* Calls the notifier callback to when dock is inserted or removed, indicated
* by a boolean passed to the callback's action parameter.
*/
void register_liquid_dock_notify(struct notifier_block *nb)
{
if (!nb)
return;
/* inform new client of current state */
if (nb->notifier_call)
nb->notifier_call(nb, docked, NULL);
blocking_notifier_chain_register(&dock_notifier_list, nb);
}
EXPORT_SYMBOL(register_liquid_dock_notify);
/**
* unregister_liquid_dock_notify - unregister a notifier callback
* @nb: pointer to the notifier block for the callback events.
*
* register_liquid_dock_notify() must have been previously called for this
* function to work properly.
*/
void unregister_liquid_dock_notify(struct notifier_block *nb)
{
blocking_notifier_chain_unregister(&dock_notifier_list, nb);
}
EXPORT_SYMBOL(unregister_liquid_dock_notify);
struct liquid_dock {
struct device *dev;
struct work_struct dock_work;
int dock_detect;
int dock_hub_reset;
int dock_eth_reset;
int dock_enable;
struct platform_device *usb3_pdev;
};
static void dock_detected_work(struct work_struct *w)
{
struct liquid_dock *dock = container_of(w, struct liquid_dock,
dock_work);
docked = gpio_get_value(dock->dock_detect);
if (dock->dock_enable)
gpio_direction_output(dock->dock_enable, 0);
if (docked) {
/* assert RESETs before turning on power */
if (dock->dock_hub_reset >= 0)
gpio_direction_output(dock->dock_hub_reset, 1);
if (dock->dock_eth_reset >= 0)
gpio_direction_output(dock->dock_eth_reset, 1);
if (device_attach(&dock->usb3_pdev->dev) != 1) {
dev_err(dock->dev, "Could not add USB driver 0x%p\n",
dock->usb3_pdev);
return;
}
if (dock->dock_enable)
gpio_direction_output(dock->dock_enable, 1);
msleep(20); /* short delay before de-asserting RESETs */
if (dock->dock_hub_reset >= 0)
gpio_direction_output(dock->dock_hub_reset, 0);
if (dock->dock_eth_reset >= 0)
gpio_direction_output(dock->dock_eth_reset, 0);
} else {
device_release_driver(&dock->usb3_pdev->dev);
}
blocking_notifier_call_chain(&dock_notifier_list, docked, NULL);
/* Allow system suspend */
pm_relax(dock->dev);
}
static irqreturn_t dock_detected(int irq, void *data)
{
struct liquid_dock *dock = data;
/* Ensure suspend can't happen until after work function commpletes */
pm_stay_awake(dock->dev);
schedule_work(&dock->dock_work);
return IRQ_HANDLED;
}
static int liquid_dock_probe(struct platform_device *pdev)
{
struct device_node *node = pdev->dev.of_node;
struct device_node *usb3_node;
struct liquid_dock *dock;
int ret;
dock = devm_kzalloc(&pdev->dev, sizeof(*dock), GFP_KERNEL);
if (!dock)
return -ENOMEM;
dock->dev = &pdev->dev;
platform_set_drvdata(pdev, dock);
INIT_WORK(&dock->dock_work, dock_detected_work);
dock->dock_detect = of_get_named_gpio(node, "qcom,dock-detect-gpio", 0);
if (dock->dock_detect < 0) {
dev_err(dock->dev, "unable to get dock-detect-gpio\n");
return dock->dock_detect;
}
ret = devm_gpio_request(dock->dev, dock->dock_detect, "dock_detect");
if (ret)
return ret;
ret = devm_request_irq(&pdev->dev, gpio_to_irq(dock->dock_detect),
dock_detected, IRQF_TRIGGER_RISING |
IRQF_TRIGGER_FALLING | IRQF_SHARED,
"dock_detect_irq", dock);
if (ret)
return ret;
dock->dock_hub_reset = of_get_named_gpio(node,
"qcom,dock-hub-reset-gpio", 0);
if (dock->dock_hub_reset < 0) {
dev_err(dock->dev, "unable to get dock-hub-reset-gpio\n");
} else {
ret = devm_gpio_request(dock->dev, dock->dock_hub_reset,
"dock_hub_reset");
if (ret)
return ret;
}
dock->dock_eth_reset = of_get_named_gpio(node,
"qcom,dock-eth-reset-gpio", 0);
if (dock->dock_eth_reset < 0) {
dev_err(dock->dev, "unable to get dock-eth-reset-gpio\n");
} else {
ret = devm_gpio_request(dock->dev, dock->dock_eth_reset,
"dock_eth_reset");
if (ret)
return ret;
}
dock->dock_enable = of_get_named_gpio(node, "qcom,dock-enable-gpio", 0);
if (dock->dock_enable < 0) { /* optional */
dock->dock_enable = 0;
} else {
ret = devm_gpio_request(dock->dev, dock->dock_enable,
"dock_enable");
if (ret)
return ret;
}
usb3_node = of_parse_phandle(node, "qcom,usb-host", 0);
if (!usb3_node) {
dev_err(dock->dev, "unable to get usb-host\n");
return -ENODEV;
}
dock->usb3_pdev = of_find_device_by_node(usb3_node);
if (!dock->usb3_pdev || !dock->usb3_pdev->dev.driver) {
dev_dbg(dock->dev, "usb pdev not ready\n");
of_node_put(usb3_node);
return -EPROBE_DEFER;
}
of_node_put(usb3_node);
schedule_work(&dock->dock_work);
device_init_wakeup(dock->dev, true);
enable_irq_wake(gpio_to_irq(dock->dock_detect));
return 0;
}
static int liquid_dock_remove(struct platform_device *pdev)
{
struct liquid_dock *dock = platform_get_drvdata(pdev);
disable_irq_wake(gpio_to_irq(dock->dock_detect));
cancel_work_sync(&dock->dock_work);
platform_device_put(dock->usb3_pdev);
return 0;
}
static struct of_device_id of_match_table[] = {
{ .compatible = "qcom,liquid-dock", },
{ .compatible = "qcom,apq8084-dock", },
{ },
};
static struct platform_driver liquid_dock_driver = {
.driver = {
.name = "liquid-dock-driver",
.of_match_table = of_match_table,
},
.probe = liquid_dock_probe,
.remove = liquid_dock_remove,
};
module_platform_driver(liquid_dock_driver);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("QTI LiQUID Docking Station driver");
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