mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 10:49:33 +00:00
![Jingoo Han](/assets/img/avatar_default.png)
Use the wrapper functions for getting and setting the driver data using platform_device instead of using dev_{get,set}_drvdata() with &pdev->dev, so we can directly pass a struct platform_device. Signed-off-by: Jingoo Han <jg1.han@samsung.com> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
246 lines
5.8 KiB
C
246 lines
5.8 KiB
C
/*
|
|
* System monitoring driver for DA9052 PMICs.
|
|
*
|
|
* Copyright(c) 2012 Dialog Semiconductor Ltd.
|
|
*
|
|
* Author: Anthony Olech <Anthony.Olech@diasemi.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/uaccess.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/time.h>
|
|
#include <linux/watchdog.h>
|
|
#include <linux/types.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/jiffies.h>
|
|
|
|
#include <linux/mfd/da9052/reg.h>
|
|
#include <linux/mfd/da9052/da9052.h>
|
|
|
|
#define DA9052_DEF_TIMEOUT 4
|
|
#define DA9052_TWDMIN 256
|
|
|
|
struct da9052_wdt_data {
|
|
struct watchdog_device wdt;
|
|
struct da9052 *da9052;
|
|
struct kref kref;
|
|
unsigned long jpast;
|
|
};
|
|
|
|
static const struct {
|
|
u8 reg_val;
|
|
int time; /* Seconds */
|
|
} da9052_wdt_maps[] = {
|
|
{ 1, 2 },
|
|
{ 2, 4 },
|
|
{ 3, 8 },
|
|
{ 4, 16 },
|
|
{ 5, 32 },
|
|
{ 5, 33 }, /* Actual time 32.768s so included both 32s and 33s */
|
|
{ 6, 65 },
|
|
{ 6, 66 }, /* Actual time 65.536s so include both, 65s and 66s */
|
|
{ 7, 131 },
|
|
};
|
|
|
|
|
|
static void da9052_wdt_release_resources(struct kref *r)
|
|
{
|
|
}
|
|
|
|
static int da9052_wdt_set_timeout(struct watchdog_device *wdt_dev,
|
|
unsigned int timeout)
|
|
{
|
|
struct da9052_wdt_data *driver_data = watchdog_get_drvdata(wdt_dev);
|
|
struct da9052 *da9052 = driver_data->da9052;
|
|
int ret, i;
|
|
|
|
/*
|
|
* Disable the Watchdog timer before setting
|
|
* new time out.
|
|
*/
|
|
ret = da9052_reg_update(da9052, DA9052_CONTROL_D_REG,
|
|
DA9052_CONTROLD_TWDSCALE, 0);
|
|
if (ret < 0) {
|
|
dev_err(da9052->dev, "Failed to disable watchdog bit, %d\n",
|
|
ret);
|
|
return ret;
|
|
}
|
|
if (timeout) {
|
|
/*
|
|
* To change the timeout, da9052 needs to
|
|
* be disabled for at least 150 us.
|
|
*/
|
|
udelay(150);
|
|
|
|
/* Set the desired timeout */
|
|
for (i = 0; i < ARRAY_SIZE(da9052_wdt_maps); i++)
|
|
if (da9052_wdt_maps[i].time == timeout)
|
|
break;
|
|
|
|
if (i == ARRAY_SIZE(da9052_wdt_maps))
|
|
ret = -EINVAL;
|
|
else
|
|
ret = da9052_reg_update(da9052, DA9052_CONTROL_D_REG,
|
|
DA9052_CONTROLD_TWDSCALE,
|
|
da9052_wdt_maps[i].reg_val);
|
|
if (ret < 0) {
|
|
dev_err(da9052->dev,
|
|
"Failed to update timescale bit, %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
wdt_dev->timeout = timeout;
|
|
driver_data->jpast = jiffies;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void da9052_wdt_ref(struct watchdog_device *wdt_dev)
|
|
{
|
|
struct da9052_wdt_data *driver_data = watchdog_get_drvdata(wdt_dev);
|
|
|
|
kref_get(&driver_data->kref);
|
|
}
|
|
|
|
static void da9052_wdt_unref(struct watchdog_device *wdt_dev)
|
|
{
|
|
struct da9052_wdt_data *driver_data = watchdog_get_drvdata(wdt_dev);
|
|
|
|
kref_put(&driver_data->kref, da9052_wdt_release_resources);
|
|
}
|
|
|
|
static int da9052_wdt_start(struct watchdog_device *wdt_dev)
|
|
{
|
|
return da9052_wdt_set_timeout(wdt_dev, wdt_dev->timeout);
|
|
}
|
|
|
|
static int da9052_wdt_stop(struct watchdog_device *wdt_dev)
|
|
{
|
|
return da9052_wdt_set_timeout(wdt_dev, 0);
|
|
}
|
|
|
|
static int da9052_wdt_ping(struct watchdog_device *wdt_dev)
|
|
{
|
|
struct da9052_wdt_data *driver_data = watchdog_get_drvdata(wdt_dev);
|
|
struct da9052 *da9052 = driver_data->da9052;
|
|
unsigned long msec, jnow = jiffies;
|
|
int ret;
|
|
|
|
/*
|
|
* We have a minimum time for watchdog window called TWDMIN. A write
|
|
* to the watchdog before this elapsed time should cause an error.
|
|
*/
|
|
msec = (jnow - driver_data->jpast) * 1000/HZ;
|
|
if (msec < DA9052_TWDMIN)
|
|
mdelay(msec);
|
|
|
|
/* Reset the watchdog timer */
|
|
ret = da9052_reg_update(da9052, DA9052_CONTROL_D_REG,
|
|
DA9052_CONTROLD_WATCHDOG, 1 << 7);
|
|
if (ret < 0)
|
|
goto err_strobe;
|
|
|
|
/*
|
|
* FIXME: Reset the watchdog core, in general PMIC
|
|
* is supposed to do this
|
|
*/
|
|
ret = da9052_reg_update(da9052, DA9052_CONTROL_D_REG,
|
|
DA9052_CONTROLD_WATCHDOG, 0 << 7);
|
|
err_strobe:
|
|
return ret;
|
|
}
|
|
|
|
static struct watchdog_info da9052_wdt_info = {
|
|
.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
|
|
.identity = "DA9052 Watchdog",
|
|
};
|
|
|
|
static const struct watchdog_ops da9052_wdt_ops = {
|
|
.owner = THIS_MODULE,
|
|
.start = da9052_wdt_start,
|
|
.stop = da9052_wdt_stop,
|
|
.ping = da9052_wdt_ping,
|
|
.set_timeout = da9052_wdt_set_timeout,
|
|
.ref = da9052_wdt_ref,
|
|
.unref = da9052_wdt_unref,
|
|
};
|
|
|
|
|
|
static int da9052_wdt_probe(struct platform_device *pdev)
|
|
{
|
|
struct da9052 *da9052 = dev_get_drvdata(pdev->dev.parent);
|
|
struct da9052_wdt_data *driver_data;
|
|
struct watchdog_device *da9052_wdt;
|
|
int ret;
|
|
|
|
driver_data = devm_kzalloc(&pdev->dev, sizeof(*driver_data),
|
|
GFP_KERNEL);
|
|
if (!driver_data) {
|
|
dev_err(da9052->dev, "Unable to alloacate watchdog device\n");
|
|
ret = -ENOMEM;
|
|
goto err;
|
|
}
|
|
driver_data->da9052 = da9052;
|
|
|
|
da9052_wdt = &driver_data->wdt;
|
|
|
|
da9052_wdt->timeout = DA9052_DEF_TIMEOUT;
|
|
da9052_wdt->info = &da9052_wdt_info;
|
|
da9052_wdt->ops = &da9052_wdt_ops;
|
|
watchdog_set_drvdata(da9052_wdt, driver_data);
|
|
|
|
kref_init(&driver_data->kref);
|
|
|
|
ret = da9052_reg_update(da9052, DA9052_CONTROL_D_REG,
|
|
DA9052_CONTROLD_TWDSCALE, 0);
|
|
if (ret < 0) {
|
|
dev_err(&pdev->dev, "Failed to disable watchdog bits, %d\n",
|
|
ret);
|
|
goto err;
|
|
}
|
|
|
|
ret = watchdog_register_device(&driver_data->wdt);
|
|
if (ret != 0) {
|
|
dev_err(da9052->dev, "watchdog_register_device() failed: %d\n",
|
|
ret);
|
|
goto err;
|
|
}
|
|
|
|
platform_set_drvdata(pdev, driver_data);
|
|
err:
|
|
return ret;
|
|
}
|
|
|
|
static int da9052_wdt_remove(struct platform_device *pdev)
|
|
{
|
|
struct da9052_wdt_data *driver_data = platform_get_drvdata(pdev);
|
|
|
|
watchdog_unregister_device(&driver_data->wdt);
|
|
kref_put(&driver_data->kref, da9052_wdt_release_resources);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver da9052_wdt_driver = {
|
|
.probe = da9052_wdt_probe,
|
|
.remove = da9052_wdt_remove,
|
|
.driver = {
|
|
.name = "da9052-watchdog",
|
|
},
|
|
};
|
|
|
|
module_platform_driver(da9052_wdt_driver);
|
|
|
|
MODULE_AUTHOR("Anthony Olech <Anthony.Olech@diasemi.com>");
|
|
MODULE_DESCRIPTION("DA9052 SM Device Driver");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("platform:da9052-watchdog");
|