mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-07 19:14:21 +08:00
2e62c4988b
- Add SPDX identifier - Remove boiler plate license text - If MODULE_LICENSE and boiler plate does not match, go for boiler plate license Signed-off-by: Marcus Folkesson <marcus.folkesson@gmail.com> Acked-by: Adam Thomson <Adam.Thomson.Opensource@diasemi.com> Acked-by: Baruch Siach <baruch@tkos.co.il> Acked-by: Charles Keepax <ckeepax@opensource.cirrus.com> Acked-by: Keiji Hayashibara <hayashibara.keiji@socionext.com> Acked-by: Johannes Thumshirn <jth@kernel.org> Acked-by: Florian Fainelli <f.fainelli@gmail.com> Acked-by: Mans Rullgard <mans@mansr.com> Acked-by: Matthias Brugger <matthias.bgg@gmail.com> Acked-by: Michal Simek <michal.simek@xilinx.com> Acked-by: Neil Armstrong <narmstrong@baylibre.com> Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com> Acked-by: Thierry Reding <treding@nvidia.com> Acked-by: Tomas Winkler <tomas.winkler@intel.com> Acked-by: Patrice Chotard <patrice.chotard@st.com> Acked-by: William Breathitt Gray <vilhelm.gray@gmail.com> Reviewed-by: Eric Anholt <eric@anholt.net> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
179 lines
4.0 KiB
C
179 lines
4.0 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* Watchdog driver for the wm8350
|
|
*
|
|
* Copyright (C) 2007, 2008 Wolfson Microelectronics <linux@wolfsonmicro.com>
|
|
*/
|
|
|
|
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/moduleparam.h>
|
|
#include <linux/types.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/watchdog.h>
|
|
#include <linux/uaccess.h>
|
|
#include <linux/mfd/wm8350/core.h>
|
|
|
|
static bool nowayout = WATCHDOG_NOWAYOUT;
|
|
module_param(nowayout, bool, 0);
|
|
MODULE_PARM_DESC(nowayout,
|
|
"Watchdog cannot be stopped once started (default="
|
|
__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
|
|
|
|
static DEFINE_MUTEX(wdt_mutex);
|
|
|
|
static struct {
|
|
unsigned int time; /* Seconds */
|
|
u16 val; /* To be set in WM8350_SYSTEM_CONTROL_2 */
|
|
} wm8350_wdt_cfgs[] = {
|
|
{ 1, 0x02 },
|
|
{ 2, 0x04 },
|
|
{ 4, 0x05 },
|
|
};
|
|
|
|
static int wm8350_wdt_set_timeout(struct watchdog_device *wdt_dev,
|
|
unsigned int timeout)
|
|
{
|
|
struct wm8350 *wm8350 = watchdog_get_drvdata(wdt_dev);
|
|
int ret, i;
|
|
u16 reg;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(wm8350_wdt_cfgs); i++)
|
|
if (wm8350_wdt_cfgs[i].time == timeout)
|
|
break;
|
|
if (i == ARRAY_SIZE(wm8350_wdt_cfgs))
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&wdt_mutex);
|
|
wm8350_reg_unlock(wm8350);
|
|
|
|
reg = wm8350_reg_read(wm8350, WM8350_SYSTEM_CONTROL_2);
|
|
reg &= ~WM8350_WDOG_TO_MASK;
|
|
reg |= wm8350_wdt_cfgs[i].val;
|
|
ret = wm8350_reg_write(wm8350, WM8350_SYSTEM_CONTROL_2, reg);
|
|
|
|
wm8350_reg_lock(wm8350);
|
|
mutex_unlock(&wdt_mutex);
|
|
|
|
wdt_dev->timeout = timeout;
|
|
return ret;
|
|
}
|
|
|
|
static int wm8350_wdt_start(struct watchdog_device *wdt_dev)
|
|
{
|
|
struct wm8350 *wm8350 = watchdog_get_drvdata(wdt_dev);
|
|
int ret;
|
|
u16 reg;
|
|
|
|
mutex_lock(&wdt_mutex);
|
|
wm8350_reg_unlock(wm8350);
|
|
|
|
reg = wm8350_reg_read(wm8350, WM8350_SYSTEM_CONTROL_2);
|
|
reg &= ~WM8350_WDOG_MODE_MASK;
|
|
reg |= 0x20;
|
|
ret = wm8350_reg_write(wm8350, WM8350_SYSTEM_CONTROL_2, reg);
|
|
|
|
wm8350_reg_lock(wm8350);
|
|
mutex_unlock(&wdt_mutex);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int wm8350_wdt_stop(struct watchdog_device *wdt_dev)
|
|
{
|
|
struct wm8350 *wm8350 = watchdog_get_drvdata(wdt_dev);
|
|
int ret;
|
|
u16 reg;
|
|
|
|
mutex_lock(&wdt_mutex);
|
|
wm8350_reg_unlock(wm8350);
|
|
|
|
reg = wm8350_reg_read(wm8350, WM8350_SYSTEM_CONTROL_2);
|
|
reg &= ~WM8350_WDOG_MODE_MASK;
|
|
ret = wm8350_reg_write(wm8350, WM8350_SYSTEM_CONTROL_2, reg);
|
|
|
|
wm8350_reg_lock(wm8350);
|
|
mutex_unlock(&wdt_mutex);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int wm8350_wdt_ping(struct watchdog_device *wdt_dev)
|
|
{
|
|
struct wm8350 *wm8350 = watchdog_get_drvdata(wdt_dev);
|
|
int ret;
|
|
u16 reg;
|
|
|
|
mutex_lock(&wdt_mutex);
|
|
|
|
reg = wm8350_reg_read(wm8350, WM8350_SYSTEM_CONTROL_2);
|
|
ret = wm8350_reg_write(wm8350, WM8350_SYSTEM_CONTROL_2, reg);
|
|
|
|
mutex_unlock(&wdt_mutex);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static const struct watchdog_info wm8350_wdt_info = {
|
|
.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
|
|
.identity = "WM8350 Watchdog",
|
|
};
|
|
|
|
static const struct watchdog_ops wm8350_wdt_ops = {
|
|
.owner = THIS_MODULE,
|
|
.start = wm8350_wdt_start,
|
|
.stop = wm8350_wdt_stop,
|
|
.ping = wm8350_wdt_ping,
|
|
.set_timeout = wm8350_wdt_set_timeout,
|
|
};
|
|
|
|
static struct watchdog_device wm8350_wdt = {
|
|
.info = &wm8350_wdt_info,
|
|
.ops = &wm8350_wdt_ops,
|
|
.timeout = 4,
|
|
.min_timeout = 1,
|
|
.max_timeout = 4,
|
|
};
|
|
|
|
static int wm8350_wdt_probe(struct platform_device *pdev)
|
|
{
|
|
struct wm8350 *wm8350 = platform_get_drvdata(pdev);
|
|
|
|
if (!wm8350) {
|
|
pr_err("No driver data supplied\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
watchdog_set_nowayout(&wm8350_wdt, nowayout);
|
|
watchdog_set_drvdata(&wm8350_wdt, wm8350);
|
|
wm8350_wdt.parent = &pdev->dev;
|
|
|
|
/* Default to 4s timeout */
|
|
wm8350_wdt_set_timeout(&wm8350_wdt, 4);
|
|
|
|
return watchdog_register_device(&wm8350_wdt);
|
|
}
|
|
|
|
static int wm8350_wdt_remove(struct platform_device *pdev)
|
|
{
|
|
watchdog_unregister_device(&wm8350_wdt);
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver wm8350_wdt_driver = {
|
|
.probe = wm8350_wdt_probe,
|
|
.remove = wm8350_wdt_remove,
|
|
.driver = {
|
|
.name = "wm8350-wdt",
|
|
},
|
|
};
|
|
|
|
module_platform_driver(wm8350_wdt_driver);
|
|
|
|
MODULE_AUTHOR("Mark Brown");
|
|
MODULE_DESCRIPTION("WM8350 Watchdog");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("platform:wm8350-wdt");
|