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![Pratyush Anand](/assets/img/avatar_default.png)
/sys/class/watchdog/watchdogn/device/modalias can help to identify the driver/module for a given watchdog node. However, many wdt devices do not set their parent and so, we do not see an entry for device in sysfs for such devices. This patch fixes parent of watchdog_device so that /sys/class/watchdog/watchdogn/device is populated. Exceptions: booke, diag288, octeon, softdog and w83627hf -- They do not have any parent. Not sure, how we can identify driver for these devices. Signed-off-by: Pratyush Anand <panand@redhat.com> Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de> Acked-by: Guenter Roeck <linux@roeck-us.net> Acked-by: H Hartley Sweeten <hsweeten@visionengravers.com> Acked-by: Lee Jones <lee.jones@linaro.org> Acked-by: Lubomir Rintel <lkundrak@v3.sk> Acked-by: Maxime Coquelin <maxime.coquelin@st.com> Acked-by: Thierry Reding <treding@nvidia.com> Acked-by: Viresh Kumar <viresh.kumar@linaro.org> Acked-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
246 lines
5.8 KiB
C
246 lines
5.8 KiB
C
/*
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* System monitoring driver for DA9052 PMICs.
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*
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* Copyright(c) 2012 Dialog Semiconductor Ltd.
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*
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* Author: Anthony Olech <Anthony.Olech@diasemi.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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*/
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#include <linux/module.h>
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#include <linux/delay.h>
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#include <linux/uaccess.h>
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#include <linux/platform_device.h>
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#include <linux/time.h>
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#include <linux/watchdog.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/jiffies.h>
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#include <linux/mfd/da9052/reg.h>
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#include <linux/mfd/da9052/da9052.h>
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#define DA9052_DEF_TIMEOUT 4
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#define DA9052_TWDMIN 256
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struct da9052_wdt_data {
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struct watchdog_device wdt;
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struct da9052 *da9052;
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struct kref kref;
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unsigned long jpast;
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};
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static const struct {
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u8 reg_val;
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int time; /* Seconds */
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} da9052_wdt_maps[] = {
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{ 1, 2 },
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{ 2, 4 },
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{ 3, 8 },
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{ 4, 16 },
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{ 5, 32 },
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{ 5, 33 }, /* Actual time 32.768s so included both 32s and 33s */
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{ 6, 65 },
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{ 6, 66 }, /* Actual time 65.536s so include both, 65s and 66s */
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{ 7, 131 },
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};
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static void da9052_wdt_release_resources(struct kref *r)
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{
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}
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static int da9052_wdt_set_timeout(struct watchdog_device *wdt_dev,
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unsigned int timeout)
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{
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struct da9052_wdt_data *driver_data = watchdog_get_drvdata(wdt_dev);
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struct da9052 *da9052 = driver_data->da9052;
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int ret, i;
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/*
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* Disable the Watchdog timer before setting
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* new time out.
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*/
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ret = da9052_reg_update(da9052, DA9052_CONTROL_D_REG,
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DA9052_CONTROLD_TWDSCALE, 0);
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if (ret < 0) {
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dev_err(da9052->dev, "Failed to disable watchdog bit, %d\n",
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ret);
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return ret;
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}
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if (timeout) {
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/*
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* To change the timeout, da9052 needs to
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* be disabled for at least 150 us.
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*/
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udelay(150);
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/* Set the desired timeout */
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for (i = 0; i < ARRAY_SIZE(da9052_wdt_maps); i++)
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if (da9052_wdt_maps[i].time == timeout)
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break;
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if (i == ARRAY_SIZE(da9052_wdt_maps))
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ret = -EINVAL;
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else
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ret = da9052_reg_update(da9052, DA9052_CONTROL_D_REG,
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DA9052_CONTROLD_TWDSCALE,
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da9052_wdt_maps[i].reg_val);
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if (ret < 0) {
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dev_err(da9052->dev,
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"Failed to update timescale bit, %d\n", ret);
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return ret;
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}
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wdt_dev->timeout = timeout;
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driver_data->jpast = jiffies;
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}
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return 0;
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}
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static void da9052_wdt_ref(struct watchdog_device *wdt_dev)
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{
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struct da9052_wdt_data *driver_data = watchdog_get_drvdata(wdt_dev);
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kref_get(&driver_data->kref);
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}
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static void da9052_wdt_unref(struct watchdog_device *wdt_dev)
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{
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struct da9052_wdt_data *driver_data = watchdog_get_drvdata(wdt_dev);
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kref_put(&driver_data->kref, da9052_wdt_release_resources);
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}
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static int da9052_wdt_start(struct watchdog_device *wdt_dev)
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{
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return da9052_wdt_set_timeout(wdt_dev, wdt_dev->timeout);
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}
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static int da9052_wdt_stop(struct watchdog_device *wdt_dev)
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{
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return da9052_wdt_set_timeout(wdt_dev, 0);
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}
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static int da9052_wdt_ping(struct watchdog_device *wdt_dev)
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{
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struct da9052_wdt_data *driver_data = watchdog_get_drvdata(wdt_dev);
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struct da9052 *da9052 = driver_data->da9052;
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unsigned long msec, jnow = jiffies;
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int ret;
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/*
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* We have a minimum time for watchdog window called TWDMIN. A write
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* to the watchdog before this elapsed time should cause an error.
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*/
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msec = (jnow - driver_data->jpast) * 1000/HZ;
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if (msec < DA9052_TWDMIN)
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mdelay(msec);
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/* Reset the watchdog timer */
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ret = da9052_reg_update(da9052, DA9052_CONTROL_D_REG,
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DA9052_CONTROLD_WATCHDOG, 1 << 7);
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if (ret < 0)
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goto err_strobe;
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/*
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* FIXME: Reset the watchdog core, in general PMIC
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* is supposed to do this
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*/
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ret = da9052_reg_update(da9052, DA9052_CONTROL_D_REG,
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DA9052_CONTROLD_WATCHDOG, 0 << 7);
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err_strobe:
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return ret;
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}
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static struct watchdog_info da9052_wdt_info = {
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.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
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.identity = "DA9052 Watchdog",
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};
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static const struct watchdog_ops da9052_wdt_ops = {
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.owner = THIS_MODULE,
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.start = da9052_wdt_start,
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.stop = da9052_wdt_stop,
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.ping = da9052_wdt_ping,
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.set_timeout = da9052_wdt_set_timeout,
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.ref = da9052_wdt_ref,
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.unref = da9052_wdt_unref,
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};
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static int da9052_wdt_probe(struct platform_device *pdev)
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{
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struct da9052 *da9052 = dev_get_drvdata(pdev->dev.parent);
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struct da9052_wdt_data *driver_data;
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struct watchdog_device *da9052_wdt;
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int ret;
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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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driver_data->da9052 = da9052;
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da9052_wdt = &driver_data->wdt;
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da9052_wdt->timeout = DA9052_DEF_TIMEOUT;
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da9052_wdt->info = &da9052_wdt_info;
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da9052_wdt->ops = &da9052_wdt_ops;
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da9052_wdt->parent = &pdev->dev;
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watchdog_set_drvdata(da9052_wdt, driver_data);
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kref_init(&driver_data->kref);
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ret = da9052_reg_update(da9052, DA9052_CONTROL_D_REG,
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DA9052_CONTROLD_TWDSCALE, 0);
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if (ret < 0) {
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dev_err(&pdev->dev, "Failed to disable watchdog bits, %d\n",
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ret);
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goto err;
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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(da9052->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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err:
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return ret;
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}
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static int da9052_wdt_remove(struct platform_device *pdev)
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{
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struct da9052_wdt_data *driver_data = platform_get_drvdata(pdev);
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watchdog_unregister_device(&driver_data->wdt);
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kref_put(&driver_data->kref, da9052_wdt_release_resources);
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return 0;
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}
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static struct platform_driver da9052_wdt_driver = {
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.probe = da9052_wdt_probe,
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.remove = da9052_wdt_remove,
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.driver = {
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.name = "da9052-watchdog",
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},
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};
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module_platform_driver(da9052_wdt_driver);
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MODULE_AUTHOR("Anthony Olech <Anthony.Olech@diasemi.com>");
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MODULE_DESCRIPTION("DA9052 SM Device Driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:da9052-watchdog");
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