Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / watchdog / twl4030_wdt.c

diff --git a/kernel/drivers/watchdog/twl4030_wdt.c b/kernel/drivers/watchdog/twl4030_wdt.c
new file mode 100644 (file)
index 0000000..2c1db6f
--- /dev/null
+++ b/kernel/drivers/watchdog/twl4030_wdt.c
@@ -0,0 +1,153 @@
+/*
+ * Copyright (C) Nokia Corporation
+ *
+ * Written by Timo Kokkonen <timo.t.kokkonen at nokia.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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/kernel.h>
+#include <linux/watchdog.h>
+#include <linux/platform_device.h>
+#include <linux/i2c/twl.h>
+
+#define TWL4030_WATCHDOG_CFG_REG_OFFS  0x3
+
+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 int twl4030_wdt_write(unsigned char val)
+{
+       return twl_i2c_write_u8(TWL_MODULE_PM_RECEIVER, val,
+                                       TWL4030_WATCHDOG_CFG_REG_OFFS);
+}
+
+static int twl4030_wdt_start(struct watchdog_device *wdt)
+{
+       return twl4030_wdt_write(wdt->timeout + 1);
+}
+
+static int twl4030_wdt_stop(struct watchdog_device *wdt)
+{
+       return twl4030_wdt_write(0);
+}
+
+static int twl4030_wdt_set_timeout(struct watchdog_device *wdt,
+                                  unsigned int timeout)
+{
+       wdt->timeout = timeout;
+       return 0;
+}
+
+static const struct watchdog_info twl4030_wdt_info = {
+       .options = WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING,
+       .identity = "TWL4030 Watchdog",
+};
+
+static const struct watchdog_ops twl4030_wdt_ops = {
+       .owner          = THIS_MODULE,
+       .start          = twl4030_wdt_start,
+       .stop           = twl4030_wdt_stop,
+       .set_timeout    = twl4030_wdt_set_timeout,
+};
+
+static int twl4030_wdt_probe(struct platform_device *pdev)
+{
+       int ret = 0;
+       struct watchdog_device *wdt;
+
+       wdt = devm_kzalloc(&pdev->dev, sizeof(*wdt), GFP_KERNEL);
+       if (!wdt)
+               return -ENOMEM;
+
+       wdt->info               = &twl4030_wdt_info;
+       wdt->ops                = &twl4030_wdt_ops;
+       wdt->status             = 0;
+       wdt->timeout            = 30;
+       wdt->min_timeout        = 1;
+       wdt->max_timeout        = 30;
+
+       watchdog_set_nowayout(wdt, nowayout);
+       platform_set_drvdata(pdev, wdt);
+
+       twl4030_wdt_stop(wdt);
+
+       ret = watchdog_register_device(wdt);
+       if (ret)
+               return ret;
+
+       return 0;
+}
+
+static int twl4030_wdt_remove(struct platform_device *pdev)
+{
+       struct watchdog_device *wdt = platform_get_drvdata(pdev);
+
+       watchdog_unregister_device(wdt);
+
+       return 0;
+}
+
+#ifdef CONFIG_PM
+static int twl4030_wdt_suspend(struct platform_device *pdev, pm_message_t state)
+{
+       struct watchdog_device *wdt = platform_get_drvdata(pdev);
+       if (watchdog_active(wdt))
+               return twl4030_wdt_stop(wdt);
+
+       return 0;
+}
+
+static int twl4030_wdt_resume(struct platform_device *pdev)
+{
+       struct watchdog_device *wdt = platform_get_drvdata(pdev);
+       if (watchdog_active(wdt))
+               return twl4030_wdt_start(wdt);
+
+       return 0;
+}
+#else
+#define twl4030_wdt_suspend        NULL
+#define twl4030_wdt_resume         NULL
+#endif
+
+static const struct of_device_id twl_wdt_of_match[] = {
+       { .compatible = "ti,twl4030-wdt", },
+       { },
+};
+MODULE_DEVICE_TABLE(of, twl_wdt_of_match);
+
+static struct platform_driver twl4030_wdt_driver = {
+       .probe          = twl4030_wdt_probe,
+       .remove         = twl4030_wdt_remove,
+       .suspend        = twl4030_wdt_suspend,
+       .resume         = twl4030_wdt_resume,
+       .driver         = {
+               .name           = "twl4030_wdt",
+               .of_match_table = twl_wdt_of_match,
+       },
+};
+
+module_platform_driver(twl4030_wdt_driver);
+
+MODULE_AUTHOR("Nokia Corporation");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:twl4030_wdt");
+