mirror of
https://github.com/AetherDroid/android_kernel_samsung_on5xelte.git
synced 2025-09-07 16:58:04 -04:00
Fixed MTP to work with TWRP
This commit is contained in:
awab228
commit
f6dfaef42e
50820 changed files with 20846062 additions and 0 deletions
312
drivers/watchdog/wm831x_wdt.c
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312
drivers/watchdog/wm831x_wdt.c
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@ -0,0 +1,312 @@
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/*
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* Watchdog driver for the wm831x PMICs
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*
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* Copyright (C) 2009 Wolfson Microelectronics
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation
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*/
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/platform_device.h>
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#include <linux/watchdog.h>
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#include <linux/uaccess.h>
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#include <linux/gpio.h>
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#include <linux/mfd/wm831x/core.h>
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#include <linux/mfd/wm831x/pdata.h>
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#include <linux/mfd/wm831x/watchdog.h>
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static bool nowayout = WATCHDOG_NOWAYOUT;
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module_param(nowayout, bool, 0);
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MODULE_PARM_DESC(nowayout,
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"Watchdog cannot be stopped once started (default="
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__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
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struct wm831x_wdt_drvdata {
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struct watchdog_device wdt;
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struct wm831x *wm831x;
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struct mutex lock;
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int update_gpio;
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int update_state;
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};
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/* We can't use the sub-second values here but they're included
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* for completeness. */
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static struct {
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unsigned int time; /* Seconds */
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u16 val; /* WDOG_TO value */
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} wm831x_wdt_cfgs[] = {
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{ 1, 2 },
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{ 2, 3 },
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{ 4, 4 },
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{ 8, 5 },
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{ 16, 6 },
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{ 32, 7 },
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{ 33, 7 }, /* Actually 32.768s so include both, others round down */
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};
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static int wm831x_wdt_start(struct watchdog_device *wdt_dev)
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{
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struct wm831x_wdt_drvdata *driver_data = watchdog_get_drvdata(wdt_dev);
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struct wm831x *wm831x = driver_data->wm831x;
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int ret;
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mutex_lock(&driver_data->lock);
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ret = wm831x_reg_unlock(wm831x);
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if (ret == 0) {
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ret = wm831x_set_bits(wm831x, WM831X_WATCHDOG,
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WM831X_WDOG_ENA, WM831X_WDOG_ENA);
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wm831x_reg_lock(wm831x);
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} else {
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dev_err(wm831x->dev, "Failed to unlock security key: %d\n",
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ret);
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}
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mutex_unlock(&driver_data->lock);
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return ret;
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}
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static int wm831x_wdt_stop(struct watchdog_device *wdt_dev)
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{
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struct wm831x_wdt_drvdata *driver_data = watchdog_get_drvdata(wdt_dev);
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struct wm831x *wm831x = driver_data->wm831x;
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int ret;
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mutex_lock(&driver_data->lock);
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ret = wm831x_reg_unlock(wm831x);
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if (ret == 0) {
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ret = wm831x_set_bits(wm831x, WM831X_WATCHDOG,
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WM831X_WDOG_ENA, 0);
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wm831x_reg_lock(wm831x);
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} else {
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dev_err(wm831x->dev, "Failed to unlock security key: %d\n",
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ret);
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}
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mutex_unlock(&driver_data->lock);
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return ret;
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}
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static int wm831x_wdt_ping(struct watchdog_device *wdt_dev)
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{
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struct wm831x_wdt_drvdata *driver_data = watchdog_get_drvdata(wdt_dev);
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struct wm831x *wm831x = driver_data->wm831x;
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int ret;
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u16 reg;
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mutex_lock(&driver_data->lock);
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if (driver_data->update_gpio) {
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gpio_set_value_cansleep(driver_data->update_gpio,
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driver_data->update_state);
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driver_data->update_state = !driver_data->update_state;
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ret = 0;
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goto out;
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}
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reg = wm831x_reg_read(wm831x, WM831X_WATCHDOG);
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if (!(reg & WM831X_WDOG_RST_SRC)) {
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dev_err(wm831x->dev, "Hardware watchdog update unsupported\n");
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ret = -EINVAL;
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goto out;
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}
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reg |= WM831X_WDOG_RESET;
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ret = wm831x_reg_unlock(wm831x);
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if (ret == 0) {
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ret = wm831x_reg_write(wm831x, WM831X_WATCHDOG, reg);
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wm831x_reg_lock(wm831x);
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} else {
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dev_err(wm831x->dev, "Failed to unlock security key: %d\n",
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ret);
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}
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out:
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mutex_unlock(&driver_data->lock);
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return ret;
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}
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static int wm831x_wdt_set_timeout(struct watchdog_device *wdt_dev,
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unsigned int timeout)
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{
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struct wm831x_wdt_drvdata *driver_data = watchdog_get_drvdata(wdt_dev);
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struct wm831x *wm831x = driver_data->wm831x;
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int ret, i;
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for (i = 0; i < ARRAY_SIZE(wm831x_wdt_cfgs); i++)
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if (wm831x_wdt_cfgs[i].time == timeout)
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break;
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if (i == ARRAY_SIZE(wm831x_wdt_cfgs))
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return -EINVAL;
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ret = wm831x_reg_unlock(wm831x);
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if (ret == 0) {
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ret = wm831x_set_bits(wm831x, WM831X_WATCHDOG,
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WM831X_WDOG_TO_MASK,
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wm831x_wdt_cfgs[i].val);
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wm831x_reg_lock(wm831x);
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} else {
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dev_err(wm831x->dev, "Failed to unlock security key: %d\n",
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ret);
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}
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wdt_dev->timeout = timeout;
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return ret;
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}
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static const struct watchdog_info wm831x_wdt_info = {
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.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
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.identity = "WM831x Watchdog",
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};
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static const struct watchdog_ops wm831x_wdt_ops = {
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.owner = THIS_MODULE,
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.start = wm831x_wdt_start,
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.stop = wm831x_wdt_stop,
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.ping = wm831x_wdt_ping,
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.set_timeout = wm831x_wdt_set_timeout,
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};
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static int wm831x_wdt_probe(struct platform_device *pdev)
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{
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struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
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struct wm831x_pdata *chip_pdata = dev_get_platdata(pdev->dev.parent);
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struct wm831x_watchdog_pdata *pdata;
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struct wm831x_wdt_drvdata *driver_data;
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struct watchdog_device *wm831x_wdt;
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int reg, ret, i;
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ret = wm831x_reg_read(wm831x, WM831X_WATCHDOG);
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if (ret < 0) {
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dev_err(wm831x->dev, "Failed to read watchdog status: %d\n",
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ret);
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goto err;
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}
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reg = ret;
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if (reg & WM831X_WDOG_DEBUG)
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dev_warn(wm831x->dev, "Watchdog is paused\n");
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driver_data = devm_kzalloc(&pdev->dev, sizeof(*driver_data),
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GFP_KERNEL);
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if (!driver_data) {
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ret = -ENOMEM;
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goto err;
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}
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mutex_init(&driver_data->lock);
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driver_data->wm831x = wm831x;
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wm831x_wdt = &driver_data->wdt;
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wm831x_wdt->info = &wm831x_wdt_info;
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wm831x_wdt->ops = &wm831x_wdt_ops;
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watchdog_set_nowayout(wm831x_wdt, nowayout);
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watchdog_set_drvdata(wm831x_wdt, driver_data);
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reg = wm831x_reg_read(wm831x, WM831X_WATCHDOG);
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reg &= WM831X_WDOG_TO_MASK;
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for (i = 0; i < ARRAY_SIZE(wm831x_wdt_cfgs); i++)
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if (wm831x_wdt_cfgs[i].val == reg)
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break;
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if (i == ARRAY_SIZE(wm831x_wdt_cfgs))
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dev_warn(wm831x->dev,
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"Unknown watchdog timeout: %x\n", reg);
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else
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wm831x_wdt->timeout = wm831x_wdt_cfgs[i].time;
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/* Apply any configuration */
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if (chip_pdata)
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pdata = chip_pdata->watchdog;
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else
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pdata = NULL;
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if (pdata) {
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reg &= ~(WM831X_WDOG_SECACT_MASK | WM831X_WDOG_PRIMACT_MASK |
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WM831X_WDOG_RST_SRC);
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reg |= pdata->primary << WM831X_WDOG_PRIMACT_SHIFT;
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reg |= pdata->secondary << WM831X_WDOG_SECACT_SHIFT;
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reg |= pdata->software << WM831X_WDOG_RST_SRC_SHIFT;
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if (pdata->update_gpio) {
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ret = devm_gpio_request_one(&pdev->dev,
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pdata->update_gpio,
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GPIOF_OUT_INIT_LOW,
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"Watchdog update");
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if (ret < 0) {
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dev_err(wm831x->dev,
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"Failed to request update GPIO: %d\n",
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ret);
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goto err;
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}
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driver_data->update_gpio = pdata->update_gpio;
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/* Make sure the watchdog takes hardware updates */
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reg |= WM831X_WDOG_RST_SRC;
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}
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ret = wm831x_reg_unlock(wm831x);
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if (ret == 0) {
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ret = wm831x_reg_write(wm831x, WM831X_WATCHDOG, reg);
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wm831x_reg_lock(wm831x);
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} else {
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dev_err(wm831x->dev,
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"Failed to unlock security key: %d\n", ret);
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goto err;
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}
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}
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ret = watchdog_register_device(&driver_data->wdt);
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if (ret != 0) {
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dev_err(wm831x->dev, "watchdog_register_device() failed: %d\n",
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ret);
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goto err;
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}
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platform_set_drvdata(pdev, driver_data);
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return 0;
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err:
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return ret;
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}
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static int wm831x_wdt_remove(struct platform_device *pdev)
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{
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struct wm831x_wdt_drvdata *driver_data = platform_get_drvdata(pdev);
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watchdog_unregister_device(&driver_data->wdt);
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return 0;
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}
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static struct platform_driver wm831x_wdt_driver = {
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.probe = wm831x_wdt_probe,
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.remove = wm831x_wdt_remove,
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.driver = {
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.name = "wm831x-watchdog",
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},
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};
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module_platform_driver(wm831x_wdt_driver);
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MODULE_AUTHOR("Mark Brown");
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MODULE_DESCRIPTION("WM831x Watchdog");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:wm831x-watchdog");
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