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    SubjectRe: [PATCH 05/07] Watchdog: DA9052/53 watchdog support v1
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    Any update on below patch?
    On Mon, 2012-02-06 at 18:18 +0530, Ashish Jangam wrote:
    > This driver adds support for the watchdog functionality provided by the
    > Dialog Semiconductor DA9052/53 PMIC chip.
    >
    > This patch is functionally tested on Samsung SMDKV6410.
    >
    > Signed-off-by: David Dajun Chen <dchen@diasemi.com>
    > Signed-off-by: Ashish Jangam <ashish.jangam@kpitcummins.com>
    > ---
    > Documentation/watchdog/watchdog-parameters.txt | 5 +
    > drivers/watchdog/Kconfig | 6 +
    > drivers/watchdog/Makefile | 1 +
    > drivers/watchdog/da9052_wdt.c | 333 ++++++++++++++++++++++++
    > 4 files changed, 345 insertions(+), 0 deletions(-)
    > create mode 100644 drivers/watchdog/da9052_wdt.c
    > diff --git a/Documentation/watchdog/watchdog-parameters.txt b/Documentation/watchdog/watchdog-parameters.txt
    > index 17ddd82..04fddba 100644
    > --- a/Documentation/watchdog/watchdog-parameters.txt
    > +++ b/Documentation/watchdog/watchdog-parameters.txt
    > @@ -78,6 +78,11 @@ wd0_timeout: Default watchdog0 timeout in 1/10secs
    > wd1_timeout: Default watchdog1 timeout in 1/10secs
    > wd2_timeout: Default watchdog2 timeout in 1/10secs
    > -------------------------------------------------
    > +da9052wdt:
    > +timeout: Watchdog timeout in seconds. 2<= timeout <=131, default=2.048s
    > +nowayout: Watchdog cannot be stopped once started
    > + (default=kernel config parameter)
    > +-------------------------------------------------
    > davinci_wdt:
    > heartbeat: Watchdog heartbeat period in seconds from 1 to 600, default 60
    > -------------------------------------------------
    > diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
    > index 877b107..3fb9633 100644
    > --- a/drivers/watchdog/Kconfig
    > +++ b/drivers/watchdog/Kconfig
    > @@ -63,6 +63,12 @@ config SOFT_WATCHDOG
    > To compile this driver as a module, choose M here: the
    > module will be called softdog.
    >
    > +config DA9052_WATCHDOG
    > + tristate "Dialog DA9052/DA9053 Watchdog"
    > + depends on PMIC_DA9052
    > + help
    > + Support for the watchdog in the DA9052-BC and DA9053-AA/Bx PMICs.
    > +
    > config WM831X_WATCHDOG
    > tristate "WM831x watchdog"
    > depends on MFD_WM831X
    > diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
    > index e8f479a..0ecbe5a 100644
    > --- a/drivers/watchdog/Makefile
    > +++ b/drivers/watchdog/Makefile
    > @@ -166,4 +166,5 @@ obj-$(CONFIG_XEN_WDT) += xen_wdt.o
    > obj-$(CONFIG_WM831X_WATCHDOG) += wm831x_wdt.o
    > obj-$(CONFIG_WM8350_WATCHDOG) += wm8350_wdt.o
    > obj-$(CONFIG_MAX63XX_WATCHDOG) += max63xx_wdt.o
    > +obj-$(CONFIG_DA9052_WATCHDOG) += da9052_wdt.o
    > obj-$(CONFIG_SOFT_WATCHDOG) += softdog.o
    > diff --git a/drivers/watchdog/da9052_wdt.c b/drivers/watchdog/da9052_wdt.c
    > new file mode 100644
    > index 0000000..b08091e
    > --- /dev/null
    > +++ b/drivers/watchdog/da9052_wdt.c
    > @@ -0,0 +1,333 @@
    > +/*
    > + * System monitoring driver for DA9052 PMICs.
    > + *
    > + * Copyright(c) 2012 Dialog Semiconductor Ltd.
    > + *
    > + * Author: Dajun Chen <dchen@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/miscdevice.h>
    > +#include <linux/module.h>
    > +#include <linux/delay.h>
    > +#include <linux/fs.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/mfd/da9052/reg.h>
    > +#include <linux/mfd/da9052/da9052.h>
    > +
    > +static int nowayout = WATCHDOG_NOWAYOUT;
    > +static int wdt_state = WDIOS_DISABLECARD;
    > +static struct miscdevice da9052_wdt_miscdev;
    > +static unsigned long da9052_wdt_users;
    > +static int da9052_wdt_expect_close;
    > +struct da9052 *da9052;
    > +static DEFINE_MUTEX(wdt_mutex);
    > +
    > +static 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 int da9052_wdt_set_timeout(struct da9052 *da9052, unsigned char timeout)
    > +{
    > + int ret;
    > +
    > + /* Disable the Watchdog timer for 150us before changing the
    > + * time out value
    > + */
    > + 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;
    > + }
    > +
    > + mutex_lock(&wdt_mutex);
    > + wdt_state = (timeout == 0) ? WDIOS_DISABLECARD : WDIOS_ENABLECARD;
    > + mutex_unlock(&wdt_mutex);
    > +
    > + if (timeout) {
    > + udelay(150);
    > +
    > + /* Set the desired timeout */
    > + ret = da9052_reg_update(da9052, DA9052_CONTROL_D_REG,
    > + DA9052_CONTROLD_TWDSCALE, timeout);
    > + if (ret < 0) {
    > + dev_err(da9052->dev,
    > + "Failed to update timescale bit, %d\n", ret);
    > + return ret;
    > + }
    > + }
    > +
    > + return 0;
    > +}
    > +
    > +static int da9052_wdt_start(struct da9052 *da9052)
    > +{
    > + int ret = 0;
    > +
    > +
    > + if (wdt_state == WDIOS_DISABLECARD) {
    > + /* Default 2.048s */
    > + ret = da9052_wdt_set_timeout(da9052, 1);
    > + if (ret <= 0)
    > + goto err;
    > +
    > + mutex_lock(&wdt_mutex);
    > + wdt_state = WDIOS_ENABLECARD;
    > + mutex_unlock(&wdt_mutex);
    > + }
    > +
    > +err:
    > + return ret;
    > +}
    > +
    > +static int da9052_wdt_stop(struct da9052 *da9052)
    > +{
    > + int ret = 0;
    > +
    > + mutex_lock(&wdt_mutex);
    > +
    > + if (wdt_state == WDIOS_ENABLECARD) {
    > + 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 strobe bit, %d\n",
    > + ret);
    > + goto err;
    > + }
    > +
    > + wdt_state = WDIOS_DISABLECARD;
    > + }
    > +
    > +err:
    > + mutex_unlock(&wdt_mutex);
    > + return ret;
    > +}
    > +
    > +static void da9052_wdt_strobe(struct da9052 *da9052)
    > +{
    > + int ret;
    > +
    > + if (wdt_state == WDIOS_ENABLECARD) {
    > + ret = da9052_reg_update(da9052, DA9052_CONTROL_D_REG,
    > + DA9052_CONTROLD_WATCHDOG, 1 << 7);
    > + if (ret < 0) {
    > + dev_err(da9052->dev,
    > + "Failed to update watchdog strobe bit, %d\n",
    > + ret);
    > + return;
    > + }
    > + }
    > +}
    > +
    > +static int da9052_wdt_open(struct inode *inode, struct file *file)
    > +{
    > + int ret;
    > +
    > + if (test_and_set_bit(0, &da9052_wdt_users))
    > + return -EBUSY;
    > +
    > + ret = da9052_wdt_start(da9052);
    > + if (ret < 0)
    > + return ret;
    > +
    > + return nonseekable_open(inode, file);
    > +}
    > +
    > +static int da9052_wdt_release(struct inode *inode, struct file *file)
    > +{
    > + int ret = 0;
    > +
    > + if (da9052_wdt_expect_close == 42)
    > + ret = da9052_wdt_stop(da9052);
    > + else
    > + da9052_wdt_strobe(da9052);
    > +
    > + da9052_wdt_expect_close = 0;
    > + clear_bit(0, &da9052_wdt_users);
    > +
    > + return ret;
    > +}
    > +
    > +static struct watchdog_info da9052_wdt_info = {
    > + .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
    > + .identity = "DA9052 Watchdog",
    > +};
    > +
    > +static long da9052_wdt_ioctl(struct file *file, uint cmd, unsigned long arg)
    > +{
    > + void __user *argp = (void __user *)arg;
    > + int ret = 0, timeout, i, __user *p = argp;
    > +
    > + switch (cmd) {
    > + case WDIOC_GETSUPPORT:
    > + ret = copy_to_user(argp, &da9052_wdt_info,
    > + sizeof(da9052_wdt_info)) ? -EFAULT : 0;
    > + break;
    > + case WDIOC_GETSTATUS:
    > + case WDIOC_GETBOOTSTATUS:
    > + ret = put_user(0, p);
    > + break;
    > + case WDIOC_SETOPTIONS:
    > + {
    > + int options;
    > + ret = get_user(options, p);
    > + if (ret)
    > + break;
    > +
    > + if (options == WDIOS_ENABLECARD)
    > + ret = da9052_wdt_start(da9052);
    > +
    > + if (options == WDIOS_DISABLECARD)
    > + ret = da9052_wdt_stop(da9052);
    > +
    > + break;
    > + }
    > + case WDIOC_KEEPALIVE:
    > + da9052_wdt_strobe(da9052);
    > + break;
    > + case WDIOC_SETTIMEOUT:
    > + ret = get_user(timeout, p);
    > + if (ret)
    > + break;
    > +
    > + 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_wdt_set_timeout(da9052,
    > + da9052_wdt_maps[i].reg_val);
    > +
    > + break;
    > + case WDIOC_GETTIMEOUT:
    > + ret = da9052_reg_read(da9052, DA9052_CONTROL_D_REG);
    > + if (ret < 0)
    > + break;
    > +
    > + ret &= DA9052_CONTROLD_TWDSCALE;
    > + for (i = 0; i < ARRAY_SIZE(da9052_wdt_maps); i++)
    > + if (da9052_wdt_maps[i].reg_val == ret)
    > + break;
    > + if (i == ARRAY_SIZE(da9052_wdt_maps))
    > + ret = -EINVAL;
    > + else
    > + ret = put_user(da9052_wdt_maps[i].time, p);
    > +
    > + break;
    > + default:
    > + return -ENOTTY;
    > + }
    > +
    > + return ret;
    > +}
    > +
    > +static ssize_t da9052_wdt_write(struct file *file,
    > + const char __user *data, size_t count,
    > + loff_t *ppos)
    > +{
    > + size_t i;
    > +
    > + /* Check the magic character 'V' and reload the timer */
    > + if (count) {
    > + if (!nowayout) {
    > + da9052_wdt_expect_close = 0;
    > +
    > + /* scan for magic character */
    > + for (i = 0; i != count; i++) {
    > + char c;
    > + if (get_user(c, data + i))
    > + return -EFAULT;
    > + if (c == 'V')
    > + da9052_wdt_expect_close = 42;
    > + }
    > + /* someone wrote to us, we should reload the timer */
    > + da9052_wdt_strobe(da9052);
    > + }
    > + }
    > + return count;
    > +}
    > +
    > +static const struct file_operations da9052_wdt_fops = {
    > + .owner = THIS_MODULE,
    > + .llseek = no_llseek,
    > + .unlocked_ioctl = da9052_wdt_ioctl,
    > + .write = da9052_wdt_write,
    > + .open = da9052_wdt_open,
    > + .release = da9052_wdt_release,
    > +};
    > +
    > +static struct miscdevice da9052_wdt_miscdev = {
    > + .minor = WATCHDOG_MINOR,
    > + .name = "da9052-wdt",
    > + .fops = &da9052_wdt_fops,
    > +};
    > +
    > +static int __devinit da9052_wdt_probe(struct platform_device *pdev)
    > +{
    > + int ret;
    > +
    > + da9052 = dev_get_drvdata(pdev->dev.parent);
    > +
    > + 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);
    > + return ret;
    > + }
    > +
    > + da9052_wdt_miscdev.parent = &pdev->dev;
    > +
    > + ret = misc_register(&da9052_wdt_miscdev);
    > +
    > + return ret;
    > +}
    > +
    > +static int __devexit da9052_wdt_remove(struct platform_device *dev)
    > +{
    > + misc_deregister(&da9052_wdt_miscdev);
    > +
    > + return 0;
    > +}
    > +
    > +static struct platform_driver da9052_wdt_driver = {
    > + .probe = da9052_wdt_probe,
    > + .remove = __devexit_p(da9052_wdt_remove),
    > + .driver = {
    > + .name = "da9052-watchdog",
    > + .owner = THIS_MODULE,
    > + },
    > +};
    > +
    > +module_platform_driver(da9052_wdt_driver);
    > +
    > +MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
    > +MODULE_DESCRIPTION("DA9052 SM Device Driver");
    > +MODULE_LICENSE("GPL");
    > +MODULE_ALIAS("platform:da9052-wdt");
    >
    >




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      Last update: 2012-03-13 13:39    [W:0.055 / U:89.912 seconds]
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