| Message ID | 20241024085922.133071-6-tmyu0@nuvoton.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | Add Nuvoton NCT6694 MFD devices | expand |
On 10/24/24 01:59, Ming Yu wrote: > This driver supports Watchdog timer functionality for NCT6694 MFD > device based on USB interface. > > Signed-off-by: Ming Yu <tmyu0@nuvoton.com> > --- > MAINTAINERS | 1 + > drivers/watchdog/Kconfig | 11 ++ > drivers/watchdog/Makefile | 1 + > drivers/watchdog/nct6694_wdt.c | 329 +++++++++++++++++++++++++++++++++ > 4 files changed, 342 insertions(+) > create mode 100644 drivers/watchdog/nct6694_wdt.c > > diff --git a/MAINTAINERS b/MAINTAINERS > index eccd5e795daa..63387c0d4ab6 100644 > --- a/MAINTAINERS > +++ b/MAINTAINERS > @@ -16442,6 +16442,7 @@ F: drivers/gpio/gpio-nct6694.c > F: drivers/i2c/busses/i2c-nct6694.c > F: drivers/mfd/nct6694.c > F: drivers/net/can/nct6694_canfd.c > +F: drivers/watchdog/nct6694_wdt.c > F: include/linux/mfd/nct6694.h > > NVIDIA (rivafb and nvidiafb) FRAMEBUFFER DRIVER > diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig > index 684b9fe84fff..bc9d63d69204 100644 > --- a/drivers/watchdog/Kconfig > +++ b/drivers/watchdog/Kconfig > @@ -739,6 +739,17 @@ config MAX77620_WATCHDOG > MAX77620 chips. To compile this driver as a module, > choose M here: the module will be called max77620_wdt. > > +config NCT6694_WATCHDOG > + tristate "Nuvoton NCT6694 watchdog support" > + depends on MFD_NCT6694 > + select WATCHDOG_CORE > + help > + If you say yes to this option, support will be included for Nuvoton > + NCT6694, a USB device to watchdog timer. > + > + This driver can also be built as a module. If so, the module > + will be called nct6694_wdt. > + > config IMX2_WDT > tristate "IMX2+ Watchdog" > depends on ARCH_MXC || ARCH_LAYERSCAPE || COMPILE_TEST > diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile > index ab6f2b41e38e..453ceacd43ab 100644 > --- a/drivers/watchdog/Makefile > +++ b/drivers/watchdog/Makefile > @@ -231,6 +231,7 @@ obj-$(CONFIG_WM831X_WATCHDOG) += wm831x_wdt.o > obj-$(CONFIG_WM8350_WATCHDOG) += wm8350_wdt.o > obj-$(CONFIG_MAX63XX_WATCHDOG) += max63xx_wdt.o > obj-$(CONFIG_MAX77620_WATCHDOG) += max77620_wdt.o > +obj-$(CONFIG_NCT6694_WATCHDOG) += nct6694_wdt.o > obj-$(CONFIG_ZIIRAVE_WATCHDOG) += ziirave_wdt.o > obj-$(CONFIG_SOFT_WATCHDOG) += softdog.o > obj-$(CONFIG_MENF21BMC_WATCHDOG) += menf21bmc_wdt.o > diff --git a/drivers/watchdog/nct6694_wdt.c b/drivers/watchdog/nct6694_wdt.c > new file mode 100644 > index 000000000000..68e2926ec504 > --- /dev/null > +++ b/drivers/watchdog/nct6694_wdt.c > @@ -0,0 +1,329 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/* > + * Nuvoton NCT6694 WDT driver based on USB interface. > + * > + * Copyright (C) 2024 Nuvoton Technology Corp. > + */ > + > +#include <linux/watchdog.h> > +#include <linux/slab.h> > +#include <linux/kernel.h> > +#include <linux/module.h> > +#include <linux/mfd/core.h> > +#include <linux/platform_device.h> > +#include <linux/mfd/nct6694.h> > + > +#define DRVNAME "nct6694-wdt" > + > +#define WATCHDOG_TIMEOUT 10 > +#define WATCHDOG_PRETIMEOUT 0 > + > +/* Host interface */ > +#define REQUEST_WDT_MOD 0x07 > + > +/* Message Channel*/ > +/* Command 00h */ > +#define REQUEST_WDT_CMD0_LEN 0x0F > +#define REQUEST_WDT_CMD0_OFFSET(idx) (idx ? 0x0100 : 0x0000) /* OFFSET = SEL|CMD */ > +#define WDT_PRETIMEOUT_IDX 0x00 > +#define WDT_PRETIMEOUT_LEN 0x04 /* PRETIMEOUT(3byte) | ACT(1byte) */ > +#define WDT_TIMEOUT_IDX 0x04 > +#define WDT_TIMEOUT_LEN 0x04 /* TIMEOUT(3byte) | ACT(1byte) */ > +#define WDT_COUNTDOWN_IDX 0x0C > +#define WDT_COUNTDOWN_LEN 0x03 > + > +#define WDT_PRETIMEOUT_ACT BIT(1) > +#define WDT_TIMEOUT_ACT BIT(1) > + > +/* Command 01h */ > +#define REQUEST_WDT_CMD1_LEN 0x04 > +#define REQUEST_WDT_CMD1_OFFSET(idx) (idx ? 0x0101 : 0x0001) /* OFFSET = SEL|CMD */ > +#define WDT_CMD_IDX 0x00 > +#define WDT_CMD_LEN 0x04 > + > +static unsigned int timeout; > +module_param(timeout, int, 0); > +MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds"); > + > +static unsigned int pretimeout; > +module_param(pretimeout, int, 0); > +MODULE_PARM_DESC(pretimeout, "Watchdog pre-timeout in seconds"); > + > +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) ")"); > + > +struct nct6694_wdt_data { > + struct nct6694 *nct6694; > + struct watchdog_device wdev; > + unsigned int wdev_idx; > +}; > + > +static inline void set_buf32(void *buf, u32 u32_val) > +{ > + u8 *p = (u8 *)buf; > + > + p[0] = u32_val & 0xFF; > + p[1] = (u32_val >> 8) & 0xFF; > + p[2] = (u32_val >> 16) & 0xFF; > + p[3] = (u32_val >> 24) & 0xFF; > +} > + > +static int nct6694_wdt_start(struct watchdog_device *wdev) > +{ > + struct nct6694_wdt_data *data = watchdog_get_drvdata(wdev); > + > + pr_debug("%s: WDT(%d) Start\n", __func__, data->wdev_idx); > + > + return 0; > +} > + > +static int nct6694_wdt_stop(struct watchdog_device *wdev) > +{ > + struct nct6694_wdt_data *data = watchdog_get_drvdata(wdev); > + struct nct6694 *nct6694 = data->nct6694; > + unsigned char buf[REQUEST_WDT_CMD1_LEN] = {'W', 'D', 'T', 'C'}; > + int ret; > + > + pr_debug("%s: WDT(%d) Close\n", __func__, data->wdev_idx); > + ret = nct6694_write_msg(nct6694, REQUEST_WDT_MOD, > + REQUEST_WDT_CMD1_OFFSET(data->wdev_idx), > + REQUEST_WDT_CMD1_LEN, buf); > + if (ret) > + pr_err("%s: Failed to start WDT device!\n", __func__); Please refrain from logging noise. Besides, the message is wrong: the watchdog is stopped here, not started. Also, all messages should use dev_, not pr_ functions. > + > + return ret; > +} > + > +static int nct6694_wdt_ping(struct watchdog_device *wdev) > +{ > + struct nct6694_wdt_data *data = watchdog_get_drvdata(wdev); > + struct nct6694 *nct6694 = data->nct6694; > + unsigned char buf[REQUEST_WDT_CMD1_LEN] = {'W', 'D', 'T', 'S'}; > + int ret; > + > + pr_debug("%s: WDT(%d) Ping\n", __func__, data->wdev_idx); > + ret = nct6694_write_msg(nct6694, REQUEST_WDT_MOD, > + REQUEST_WDT_CMD1_OFFSET(data->wdev_idx), > + REQUEST_WDT_CMD1_LEN, buf); > + if (ret) > + pr_err("%s: Failed to ping WDT device!\n", __func__); Same as above and everywhere else. > + > + return ret; > +} > + > +static int nct6694_wdt_set_timeout(struct watchdog_device *wdev, > + unsigned int timeout) > +{ > + struct nct6694_wdt_data *data = watchdog_get_drvdata(wdev); > + struct nct6694 *nct6694 = data->nct6694; > + unsigned int timeout_fmt, pretimeout_fmt; > + unsigned char buf[REQUEST_WDT_CMD0_LEN]; > + int ret; > + > + if (timeout < wdev->pretimeout) { > + pr_err("%s: 'timeout' must be greater than 'pre timeout'!\n", > + __func__); > + return -EINVAL; the driver is supposed to adjust pretimeout in this case. And please, again, refrain from logging noise. > + } > + > + timeout_fmt = timeout * 1000 | (WDT_TIMEOUT_ACT << 24); > + pretimeout_fmt = wdev->pretimeout * 1000 | (WDT_PRETIMEOUT_ACT << 24); > + set_buf32(&buf[WDT_TIMEOUT_IDX], le32_to_cpu(timeout_fmt)); > + set_buf32(&buf[WDT_PRETIMEOUT_IDX], le32_to_cpu(pretimeout_fmt)); > + > + ret = nct6694_write_msg(nct6694, REQUEST_WDT_MOD, > + REQUEST_WDT_CMD0_OFFSET(data->wdev_idx), > + REQUEST_WDT_CMD0_LEN, buf); > + if (ret) { > + pr_err("%s: Don't write the setup command in Start stage!\n", > + __func__); > + return ret; > + } > + > + wdev->timeout = timeout; > + > + return 0; > +} > + > +static int nct6694_wdt_set_pretimeout(struct watchdog_device *wdev, > + unsigned int pretimeout) > +{ > + struct nct6694_wdt_data *data = watchdog_get_drvdata(wdev); > + struct nct6694 *nct6694 = data->nct6694; > + unsigned int timeout_fmt, pretimeout_fmt; > + unsigned char buf[REQUEST_WDT_CMD0_LEN]; > + int ret; > + > + if (pretimeout > wdev->timeout) { > + pr_err("%s: 'pre timeout' must be less than 'timeout'!\n", > + __func__); > + return -EINVAL; Already checked by the watchdog core. > + } > + timeout_fmt = wdev->timeout * 1000 | (WDT_TIMEOUT_ACT << 24); > + pretimeout_fmt = pretimeout * 1000 | (WDT_PRETIMEOUT_ACT << 24); > + set_buf32(&buf[WDT_TIMEOUT_IDX], le32_to_cpu(timeout_fmt)); > + set_buf32(&buf[WDT_PRETIMEOUT_IDX], le32_to_cpu(pretimeout_fmt)); > + > + ret = nct6694_write_msg(nct6694, REQUEST_WDT_MOD, > + REQUEST_WDT_CMD0_OFFSET(data->wdev_idx), > + REQUEST_WDT_CMD0_LEN, buf); > + if (ret) { > + pr_err("%s: Don't write the setup command in Start stage!\n", __func__); Besides it being noise, I don't even understand what this message is supposed to mean, and neither would anyone else. > + return ret; > + } > + > + wdev->pretimeout = pretimeout; > + return 0; > +} > + > +static unsigned int nct6694_wdt_get_time(struct watchdog_device *wdev) > +{ > + struct nct6694_wdt_data *data = watchdog_get_drvdata(wdev); > + struct nct6694 *nct6694 = data->nct6694; > + unsigned char buf[WDT_COUNTDOWN_LEN]; > + unsigned int timeleft_ms; > + int ret; > + > + ret = nct6694_read_msg(nct6694, REQUEST_WDT_MOD, > + REQUEST_WDT_CMD0_OFFSET(data->wdev_idx), > + REQUEST_WDT_CMD0_LEN, WDT_COUNTDOWN_IDX, > + WDT_COUNTDOWN_LEN, buf); > + if (ret) > + pr_err("%s: Failed to get WDT device!\n", __func__); > + > + timeleft_ms = ((buf[2] << 16) | (buf[1] << 8) | buf[0]) & 0xFFFFFF; If the above command failed this will be a random number. > + > + return timeleft_ms / 1000; > +} > + > +static int nct6694_wdt_setup(struct watchdog_device *wdev) > +{ > + struct nct6694_wdt_data *data = watchdog_get_drvdata(wdev); > + struct nct6694 *nct6694 = data->nct6694; > + unsigned char buf[REQUEST_WDT_CMD0_LEN] = {0}; > + unsigned int timeout_fmt, pretimeout_fmt; > + int ret; > + > + if (timeout) > + wdev->timeout = timeout; > + Already set. > + if (pretimeout) { > + wdev->pretimeout = pretimeout; Pretimeout is already set in the probe function. Do it completely there. > + pretimeout_fmt = wdev->pretimeout * 1000 | (WDT_PRETIMEOUT_ACT << 24); > + } else { > + pretimeout_fmt = 0; > + } > + > + timeout_fmt = wdev->timeout * 1000 | (WDT_TIMEOUT_ACT << 24); > + set_buf32(&buf[WDT_TIMEOUT_IDX], le32_to_cpu(timeout_fmt)); > + set_buf32(&buf[WDT_PRETIMEOUT_IDX], le32_to_cpu(pretimeout_fmt)); > + > + ret = nct6694_write_msg(nct6694, REQUEST_WDT_MOD, > + REQUEST_WDT_CMD0_OFFSET(data->wdev_idx), > + REQUEST_WDT_CMD0_LEN, buf); This seems pretty pointless at this time. Why not do it in the watchdog start function ? > + if (ret) > + return ret; > + > + pr_info("Setting WDT(%d): timeout = %d, pretimeout = %d\n", > + data->wdev_idx, wdev->timeout, wdev->pretimeout); > + > + return 0; > +} > + > +static const struct watchdog_info nct6694_wdt_info = { > + .options = WDIOF_SETTIMEOUT | > + WDIOF_KEEPALIVEPING | > + WDIOF_MAGICCLOSE | > + WDIOF_PRETIMEOUT, > + .identity = DRVNAME, > +}; > + > +static const struct watchdog_ops nct6694_wdt_ops = { > + .owner = THIS_MODULE, > + .start = nct6694_wdt_start, > + .stop = nct6694_wdt_stop, > + .set_timeout = nct6694_wdt_set_timeout, > + .set_pretimeout = nct6694_wdt_set_pretimeout, > + .get_timeleft = nct6694_wdt_get_time, > + .ping = nct6694_wdt_ping, > +}; > + > +static int nct6694_wdt_probe(struct platform_device *pdev) > +{ > + const struct mfd_cell *cell = mfd_get_cell(pdev); > + struct nct6694 *nct6694 = dev_get_drvdata(pdev->dev.parent); > + struct nct6694_wdt_data *data; > + struct watchdog_device *wdev; > + int ret; > + > + data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); > + if (!data) > + return -ENOMEM; > + > + data->nct6694 = nct6694; > + data->wdev_idx = cell->id; > + > + wdev = &data->wdev; > + wdev->info = &nct6694_wdt_info; > + wdev->ops = &nct6694_wdt_ops; > + wdev->timeout = WATCHDOG_TIMEOUT; > + wdev->pretimeout = WATCHDOG_PRETIMEOUT; > + wdev->min_timeout = 1; > + wdev->max_timeout = 255; > + > + platform_set_drvdata(pdev, data); > + > + /* Register watchdog timer device to WDT framework */ > + watchdog_set_drvdata(&data->wdev, data); > + watchdog_init_timeout(&data->wdev, timeout, &pdev->dev); > + watchdog_set_nowayout(&data->wdev, nowayout); > + watchdog_stop_on_reboot(&data->wdev); > + > + ret = devm_watchdog_register_device(&pdev->dev, &data->wdev); > + if (ret) { > + dev_err(&pdev->dev, "%s: Failed to register watchdog device: %d\n", > + __func__, ret); > + return ret; > + } > + > + ret = nct6694_wdt_setup(&data->wdev); This is too late. It needs to be done before registering the watchdog. > + if (ret) { > + dev_err(&pdev->dev, "Failed to setup WDT device!\n"); > + return ret; > + } > + > + return 0; > +} > + > +static struct platform_driver nct6694_wdt_driver = { > + .driver = { > + .name = DRVNAME, > + }, > + .probe = nct6694_wdt_probe, > +}; > + > +static int __init nct6694_init(void) > +{ > + int err; > + > + err = platform_driver_register(&nct6694_wdt_driver); > + if (!err) { > + if (err) > + platform_driver_unregister(&nct6694_wdt_driver); > + } > + > + return err; > +} > +subsys_initcall(nct6694_init); > + > +static void __exit nct6694_exit(void) > +{ > + platform_driver_unregister(&nct6694_wdt_driver); > +} > +module_exit(nct6694_exit); > + > +MODULE_DESCRIPTION("USB-WDT driver for NCT6694"); > +MODULE_AUTHOR("Ming Yu <tmyu0@nuvoton.com>"); > +MODULE_LICENSE("GPL");
On 10/24/24 01:59, Ming Yu wrote: > This driver supports Watchdog timer functionality for NCT6694 MFD > device based on USB interface. > > Signed-off-by: Ming Yu <tmyu0@nuvoton.com> > --- [ ... ] > + > +static int nct6694_wdt_start(struct watchdog_device *wdev) > +{ > + struct nct6694_wdt_data *data = watchdog_get_drvdata(wdev); > + > + pr_debug("%s: WDT(%d) Start\n", __func__, data->wdev_idx); > + > + return 0; > +} > + That doesn't make sense. How is the watchdog started if not here ? Something is conceptually wrong. Guenter
diff --git a/MAINTAINERS b/MAINTAINERS index eccd5e795daa..63387c0d4ab6 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -16442,6 +16442,7 @@ F: drivers/gpio/gpio-nct6694.c F: drivers/i2c/busses/i2c-nct6694.c F: drivers/mfd/nct6694.c F: drivers/net/can/nct6694_canfd.c +F: drivers/watchdog/nct6694_wdt.c F: include/linux/mfd/nct6694.h NVIDIA (rivafb and nvidiafb) FRAMEBUFFER DRIVER diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig index 684b9fe84fff..bc9d63d69204 100644 --- a/drivers/watchdog/Kconfig +++ b/drivers/watchdog/Kconfig @@ -739,6 +739,17 @@ config MAX77620_WATCHDOG MAX77620 chips. To compile this driver as a module, choose M here: the module will be called max77620_wdt. +config NCT6694_WATCHDOG + tristate "Nuvoton NCT6694 watchdog support" + depends on MFD_NCT6694 + select WATCHDOG_CORE + help + If you say yes to this option, support will be included for Nuvoton + NCT6694, a USB device to watchdog timer. + + This driver can also be built as a module. If so, the module + will be called nct6694_wdt. + config IMX2_WDT tristate "IMX2+ Watchdog" depends on ARCH_MXC || ARCH_LAYERSCAPE || COMPILE_TEST diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile index ab6f2b41e38e..453ceacd43ab 100644 --- a/drivers/watchdog/Makefile +++ b/drivers/watchdog/Makefile @@ -231,6 +231,7 @@ obj-$(CONFIG_WM831X_WATCHDOG) += wm831x_wdt.o obj-$(CONFIG_WM8350_WATCHDOG) += wm8350_wdt.o obj-$(CONFIG_MAX63XX_WATCHDOG) += max63xx_wdt.o obj-$(CONFIG_MAX77620_WATCHDOG) += max77620_wdt.o +obj-$(CONFIG_NCT6694_WATCHDOG) += nct6694_wdt.o obj-$(CONFIG_ZIIRAVE_WATCHDOG) += ziirave_wdt.o obj-$(CONFIG_SOFT_WATCHDOG) += softdog.o obj-$(CONFIG_MENF21BMC_WATCHDOG) += menf21bmc_wdt.o diff --git a/drivers/watchdog/nct6694_wdt.c b/drivers/watchdog/nct6694_wdt.c new file mode 100644 index 000000000000..68e2926ec504 --- /dev/null +++ b/drivers/watchdog/nct6694_wdt.c @@ -0,0 +1,329 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Nuvoton NCT6694 WDT driver based on USB interface. + * + * Copyright (C) 2024 Nuvoton Technology Corp. + */ + +#include <linux/watchdog.h> +#include <linux/slab.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/mfd/core.h> +#include <linux/platform_device.h> +#include <linux/mfd/nct6694.h> + +#define DRVNAME "nct6694-wdt" + +#define WATCHDOG_TIMEOUT 10 +#define WATCHDOG_PRETIMEOUT 0 + +/* Host interface */ +#define REQUEST_WDT_MOD 0x07 + +/* Message Channel*/ +/* Command 00h */ +#define REQUEST_WDT_CMD0_LEN 0x0F +#define REQUEST_WDT_CMD0_OFFSET(idx) (idx ? 0x0100 : 0x0000) /* OFFSET = SEL|CMD */ +#define WDT_PRETIMEOUT_IDX 0x00 +#define WDT_PRETIMEOUT_LEN 0x04 /* PRETIMEOUT(3byte) | ACT(1byte) */ +#define WDT_TIMEOUT_IDX 0x04 +#define WDT_TIMEOUT_LEN 0x04 /* TIMEOUT(3byte) | ACT(1byte) */ +#define WDT_COUNTDOWN_IDX 0x0C +#define WDT_COUNTDOWN_LEN 0x03 + +#define WDT_PRETIMEOUT_ACT BIT(1) +#define WDT_TIMEOUT_ACT BIT(1) + +/* Command 01h */ +#define REQUEST_WDT_CMD1_LEN 0x04 +#define REQUEST_WDT_CMD1_OFFSET(idx) (idx ? 0x0101 : 0x0001) /* OFFSET = SEL|CMD */ +#define WDT_CMD_IDX 0x00 +#define WDT_CMD_LEN 0x04 + +static unsigned int timeout; +module_param(timeout, int, 0); +MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds"); + +static unsigned int pretimeout; +module_param(pretimeout, int, 0); +MODULE_PARM_DESC(pretimeout, "Watchdog pre-timeout in seconds"); + +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) ")"); + +struct nct6694_wdt_data { + struct nct6694 *nct6694; + struct watchdog_device wdev; + unsigned int wdev_idx; +}; + +static inline void set_buf32(void *buf, u32 u32_val) +{ + u8 *p = (u8 *)buf; + + p[0] = u32_val & 0xFF; + p[1] = (u32_val >> 8) & 0xFF; + p[2] = (u32_val >> 16) & 0xFF; + p[3] = (u32_val >> 24) & 0xFF; +} + +static int nct6694_wdt_start(struct watchdog_device *wdev) +{ + struct nct6694_wdt_data *data = watchdog_get_drvdata(wdev); + + pr_debug("%s: WDT(%d) Start\n", __func__, data->wdev_idx); + + return 0; +} + +static int nct6694_wdt_stop(struct watchdog_device *wdev) +{ + struct nct6694_wdt_data *data = watchdog_get_drvdata(wdev); + struct nct6694 *nct6694 = data->nct6694; + unsigned char buf[REQUEST_WDT_CMD1_LEN] = {'W', 'D', 'T', 'C'}; + int ret; + + pr_debug("%s: WDT(%d) Close\n", __func__, data->wdev_idx); + ret = nct6694_write_msg(nct6694, REQUEST_WDT_MOD, + REQUEST_WDT_CMD1_OFFSET(data->wdev_idx), + REQUEST_WDT_CMD1_LEN, buf); + if (ret) + pr_err("%s: Failed to start WDT device!\n", __func__); + + return ret; +} + +static int nct6694_wdt_ping(struct watchdog_device *wdev) +{ + struct nct6694_wdt_data *data = watchdog_get_drvdata(wdev); + struct nct6694 *nct6694 = data->nct6694; + unsigned char buf[REQUEST_WDT_CMD1_LEN] = {'W', 'D', 'T', 'S'}; + int ret; + + pr_debug("%s: WDT(%d) Ping\n", __func__, data->wdev_idx); + ret = nct6694_write_msg(nct6694, REQUEST_WDT_MOD, + REQUEST_WDT_CMD1_OFFSET(data->wdev_idx), + REQUEST_WDT_CMD1_LEN, buf); + if (ret) + pr_err("%s: Failed to ping WDT device!\n", __func__); + + return ret; +} + +static int nct6694_wdt_set_timeout(struct watchdog_device *wdev, + unsigned int timeout) +{ + struct nct6694_wdt_data *data = watchdog_get_drvdata(wdev); + struct nct6694 *nct6694 = data->nct6694; + unsigned int timeout_fmt, pretimeout_fmt; + unsigned char buf[REQUEST_WDT_CMD0_LEN]; + int ret; + + if (timeout < wdev->pretimeout) { + pr_err("%s: 'timeout' must be greater than 'pre timeout'!\n", + __func__); + return -EINVAL; + } + + timeout_fmt = timeout * 1000 | (WDT_TIMEOUT_ACT << 24); + pretimeout_fmt = wdev->pretimeout * 1000 | (WDT_PRETIMEOUT_ACT << 24); + set_buf32(&buf[WDT_TIMEOUT_IDX], le32_to_cpu(timeout_fmt)); + set_buf32(&buf[WDT_PRETIMEOUT_IDX], le32_to_cpu(pretimeout_fmt)); + + ret = nct6694_write_msg(nct6694, REQUEST_WDT_MOD, + REQUEST_WDT_CMD0_OFFSET(data->wdev_idx), + REQUEST_WDT_CMD0_LEN, buf); + if (ret) { + pr_err("%s: Don't write the setup command in Start stage!\n", + __func__); + return ret; + } + + wdev->timeout = timeout; + + return 0; +} + +static int nct6694_wdt_set_pretimeout(struct watchdog_device *wdev, + unsigned int pretimeout) +{ + struct nct6694_wdt_data *data = watchdog_get_drvdata(wdev); + struct nct6694 *nct6694 = data->nct6694; + unsigned int timeout_fmt, pretimeout_fmt; + unsigned char buf[REQUEST_WDT_CMD0_LEN]; + int ret; + + if (pretimeout > wdev->timeout) { + pr_err("%s: 'pre timeout' must be less than 'timeout'!\n", + __func__); + return -EINVAL; + } + timeout_fmt = wdev->timeout * 1000 | (WDT_TIMEOUT_ACT << 24); + pretimeout_fmt = pretimeout * 1000 | (WDT_PRETIMEOUT_ACT << 24); + set_buf32(&buf[WDT_TIMEOUT_IDX], le32_to_cpu(timeout_fmt)); + set_buf32(&buf[WDT_PRETIMEOUT_IDX], le32_to_cpu(pretimeout_fmt)); + + ret = nct6694_write_msg(nct6694, REQUEST_WDT_MOD, + REQUEST_WDT_CMD0_OFFSET(data->wdev_idx), + REQUEST_WDT_CMD0_LEN, buf); + if (ret) { + pr_err("%s: Don't write the setup command in Start stage!\n", __func__); + return ret; + } + + wdev->pretimeout = pretimeout; + return 0; +} + +static unsigned int nct6694_wdt_get_time(struct watchdog_device *wdev) +{ + struct nct6694_wdt_data *data = watchdog_get_drvdata(wdev); + struct nct6694 *nct6694 = data->nct6694; + unsigned char buf[WDT_COUNTDOWN_LEN]; + unsigned int timeleft_ms; + int ret; + + ret = nct6694_read_msg(nct6694, REQUEST_WDT_MOD, + REQUEST_WDT_CMD0_OFFSET(data->wdev_idx), + REQUEST_WDT_CMD0_LEN, WDT_COUNTDOWN_IDX, + WDT_COUNTDOWN_LEN, buf); + if (ret) + pr_err("%s: Failed to get WDT device!\n", __func__); + + timeleft_ms = ((buf[2] << 16) | (buf[1] << 8) | buf[0]) & 0xFFFFFF; + + return timeleft_ms / 1000; +} + +static int nct6694_wdt_setup(struct watchdog_device *wdev) +{ + struct nct6694_wdt_data *data = watchdog_get_drvdata(wdev); + struct nct6694 *nct6694 = data->nct6694; + unsigned char buf[REQUEST_WDT_CMD0_LEN] = {0}; + unsigned int timeout_fmt, pretimeout_fmt; + int ret; + + if (timeout) + wdev->timeout = timeout; + + if (pretimeout) { + wdev->pretimeout = pretimeout; + pretimeout_fmt = wdev->pretimeout * 1000 | (WDT_PRETIMEOUT_ACT << 24); + } else { + pretimeout_fmt = 0; + } + + timeout_fmt = wdev->timeout * 1000 | (WDT_TIMEOUT_ACT << 24); + set_buf32(&buf[WDT_TIMEOUT_IDX], le32_to_cpu(timeout_fmt)); + set_buf32(&buf[WDT_PRETIMEOUT_IDX], le32_to_cpu(pretimeout_fmt)); + + ret = nct6694_write_msg(nct6694, REQUEST_WDT_MOD, + REQUEST_WDT_CMD0_OFFSET(data->wdev_idx), + REQUEST_WDT_CMD0_LEN, buf); + if (ret) + return ret; + + pr_info("Setting WDT(%d): timeout = %d, pretimeout = %d\n", + data->wdev_idx, wdev->timeout, wdev->pretimeout); + + return 0; +} + +static const struct watchdog_info nct6694_wdt_info = { + .options = WDIOF_SETTIMEOUT | + WDIOF_KEEPALIVEPING | + WDIOF_MAGICCLOSE | + WDIOF_PRETIMEOUT, + .identity = DRVNAME, +}; + +static const struct watchdog_ops nct6694_wdt_ops = { + .owner = THIS_MODULE, + .start = nct6694_wdt_start, + .stop = nct6694_wdt_stop, + .set_timeout = nct6694_wdt_set_timeout, + .set_pretimeout = nct6694_wdt_set_pretimeout, + .get_timeleft = nct6694_wdt_get_time, + .ping = nct6694_wdt_ping, +}; + +static int nct6694_wdt_probe(struct platform_device *pdev) +{ + const struct mfd_cell *cell = mfd_get_cell(pdev); + struct nct6694 *nct6694 = dev_get_drvdata(pdev->dev.parent); + struct nct6694_wdt_data *data; + struct watchdog_device *wdev; + int ret; + + data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + data->nct6694 = nct6694; + data->wdev_idx = cell->id; + + wdev = &data->wdev; + wdev->info = &nct6694_wdt_info; + wdev->ops = &nct6694_wdt_ops; + wdev->timeout = WATCHDOG_TIMEOUT; + wdev->pretimeout = WATCHDOG_PRETIMEOUT; + wdev->min_timeout = 1; + wdev->max_timeout = 255; + + platform_set_drvdata(pdev, data); + + /* Register watchdog timer device to WDT framework */ + watchdog_set_drvdata(&data->wdev, data); + watchdog_init_timeout(&data->wdev, timeout, &pdev->dev); + watchdog_set_nowayout(&data->wdev, nowayout); + watchdog_stop_on_reboot(&data->wdev); + + ret = devm_watchdog_register_device(&pdev->dev, &data->wdev); + if (ret) { + dev_err(&pdev->dev, "%s: Failed to register watchdog device: %d\n", + __func__, ret); + return ret; + } + + ret = nct6694_wdt_setup(&data->wdev); + if (ret) { + dev_err(&pdev->dev, "Failed to setup WDT device!\n"); + return ret; + } + + return 0; +} + +static struct platform_driver nct6694_wdt_driver = { + .driver = { + .name = DRVNAME, + }, + .probe = nct6694_wdt_probe, +}; + +static int __init nct6694_init(void) +{ + int err; + + err = platform_driver_register(&nct6694_wdt_driver); + if (!err) { + if (err) + platform_driver_unregister(&nct6694_wdt_driver); + } + + return err; +} +subsys_initcall(nct6694_init); + +static void __exit nct6694_exit(void) +{ + platform_driver_unregister(&nct6694_wdt_driver); +} +module_exit(nct6694_exit); + +MODULE_DESCRIPTION("USB-WDT driver for NCT6694"); +MODULE_AUTHOR("Ming Yu <tmyu0@nuvoton.com>"); +MODULE_LICENSE("GPL");
This driver supports Watchdog timer functionality for NCT6694 MFD device based on USB interface. Signed-off-by: Ming Yu <tmyu0@nuvoton.com> --- MAINTAINERS | 1 + drivers/watchdog/Kconfig | 11 ++ drivers/watchdog/Makefile | 1 + drivers/watchdog/nct6694_wdt.c | 329 +++++++++++++++++++++++++++++++++ 4 files changed, 342 insertions(+) create mode 100644 drivers/watchdog/nct6694_wdt.c