* [v1,1/1] hwmon: (nct7904) Add watchdog function
@ 2020-03-24 1:46 yuechao.zhao
2020-03-24 16:49 ` kbuild test robot
0 siblings, 1 reply; 2+ messages in thread
From: yuechao.zhao @ 2020-03-24 1:46 UTC (permalink / raw)
To: 345351830
Cc: Jean Delvare, Guenter Roeck, linux-hwmon, linux-kernel, amy.shih,
oakley.ding, jia.sui, shengkui.leng, Yuechao Zhao
From: Yuechao Zhao <yuechao.zhao@advantech.com.cn>
implement watchdong functionality into the "hwmon/nct7904.c"
Signed-off-by: Yuechao Zhao <yuechao.zhao@advantech.com.cn>
---
drivers/hwmon/nct7904.c | 157 +++++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 156 insertions(+), 1 deletion(-)
diff --git a/drivers/hwmon/nct7904.c b/drivers/hwmon/nct7904.c
index 1f5743d..137199c 100644
--- a/drivers/hwmon/nct7904.c
+++ b/drivers/hwmon/nct7904.c
@@ -8,6 +8,9 @@
* Copyright (c) 2019 Advantech
* Author: Amy.Shih <amy.shih@advantech.com.tw>
*
+ * Copyright (c) 2020 Advantech
+ * Author: Yuechao Zhao <yuechao.zhao@advantech.com.cn>
+ *
* Supports the following chips:
*
* Chip #vin #fan #pwm #temp #dts chip ID
@@ -20,6 +23,7 @@
#include <linux/i2c.h>
#include <linux/mutex.h>
#include <linux/hwmon.h>
+#include <linux/watchdog.h>
#define VENDOR_ID_REG 0x7A /* Any bank */
#define NUVOTON_ID 0x50
@@ -87,18 +91,39 @@
#define FANCTL1_FMR_REG 0x00 /* Bank 3; 1 reg per channel */
#define FANCTL1_OUT_REG 0x10 /* Bank 3; 1 reg per channel */
+#define WDT_LOCK_REG 0xE0 /* W/O Lock Watchdog Register */
+#define WDT_EN_REG 0xE1 /* R/O Watchdog Enable Register */
+#define WDT_STS_REG 0xE2 /* R/O Watchdog Status Register */
+#define WDT_TIMER_REG 0xE3 /* R/W Watchdog Timer Register */
+#define WDT_SOFT_EN 0x55 /* Enable soft watchdog timer */
+#define WDT_SOFT_DIS 0xAA /* Disable soft watchdog timer */
+
#define VOLT_MONITOR_MODE 0x0
#define THERMAL_DIODE_MODE 0x1
#define THERMISTOR_MODE 0x3
#define ENABLE_TSI BIT(1)
+#define WATCHDOG_TIMEOUT 1 /* 1 minute default timeout */
+static int ping_timeout = WATCHDOG_TIMEOUT; /* default feeding timeout */
+
+static int timeout = WATCHDOG_TIMEOUT;
+module_param(timeout, int, 0);
+MODULE_PARM_DESC(timeout, "Watchdog timeout in minutes. 1 <= timeout <= 255, default="
+ __MODULE_STRING(WATCHODOG_TIMEOUT) ".");
+
+static bool nowayout = WATCHDOG_NOWAYOUT;
+module_param(nowayout, bool, 0);
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started once started (default="
+ __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
+
static const unsigned short normal_i2c[] = {
0x2d, 0x2e, I2C_CLIENT_END
};
struct nct7904_data {
struct i2c_client *client;
+ struct watchdog_device wdt;
struct mutex bank_lock;
int bank_sel;
u32 fanin_mask;
@@ -889,6 +914,91 @@ static int nct7904_detect(struct i2c_client *client,
.info = nct7904_info,
};
+/*
+ * Wathcdog Function
+ */
+static int nct7904_wdt_start(struct watchdog_device *wdt)
+{
+ int ret;
+ struct nct7904_data *data = watchdog_get_drvdata(wdt);
+
+ /* Disable soft watchdog timer first */
+ ret = nct7904_write_reg(data, BANK_0, WDT_LOCK_REG, WDT_SOFT_DIS);
+ if (ret < 0)
+ return ret;
+
+ /* Enable soft watchdog timer */
+ ret = nct7904_write_reg(data, BANK_0, WDT_LOCK_REG, WDT_SOFT_EN);
+ return ret;
+}
+
+static int nct7904_wdt_stop(struct watchdog_device *wdt)
+{
+ struct nct7904_data *data = watchdog_get_drvdata(wdt);
+ int ret;
+
+ ret = nct7904_write_reg(data, BANK_0, WDT_LOCK_REG, WDT_SOFT_DIS);
+
+ return ret;
+}
+
+static int nct7904_wdt_set_timeout(struct watchdog_device *wdt,
+ unsigned int timeout)
+{
+ struct nct7904_data *data = watchdog_get_drvdata(wdt);
+
+ ping_timeout = timeout / 60;
+
+ return nct7904_write_reg(data, BANK_0, WDT_TIMER_REG, ping_timeout);
+}
+
+static int nct7904_wdt_ping(struct watchdog_device *wdt)
+{
+ /*
+ * Note:
+ * NCT7904 is not supported refresh WDT_TIMER_REG register when the
+ * watchdog is actiove. Please disable watchdog before fedding the
+ * watchdog and enable it again.
+ */
+ struct nct7904_data *data = watchdog_get_drvdata(wdt);
+ int ret;
+
+ /* Disable soft watchdog timer */
+ ret = nct7904_write_reg(data, BANK_0, WDT_LOCK_REG, WDT_SOFT_DIS);
+ if (ret < 0)
+ goto ping_err;
+
+ /* feed watchdog */
+ ret = nct7904_write_reg(data, BANK_0, WDT_TIMER_REG, ping_timeout);
+ if (ret < 0)
+ goto ping_err;
+
+ /* Enable soft watchdog timer */
+ ret = nct7904_write_reg(data, BANK_0, WDT_TIMER_REG, WDT_SOFT_EN);
+ if (ret < 0)
+ goto ping_err;
+
+ return 0;
+
+ping_err:
+ pr_err("nct7904 ping error\n");
+ return ret;
+}
+
+static const struct watchdog_info nct7904_wdt_info = {
+ .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING |
+ WDIOF_MAGICCLOSE,
+ .identity = "nct7904 watchdog",
+};
+
+static const struct watchdog_ops nct7904_wdt_ops = {
+ .owner = THIS_MODULE,
+ .start = nct7904_wdt_start,
+ .stop = nct7904_wdt_stop,
+ .ping = nct7904_wdt_ping,
+ .set_timeout = nct7904_wdt_set_timeout,
+};
+
static int nct7904_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
@@ -1012,7 +1122,51 @@ static int nct7904_probe(struct i2c_client *client,
hwmon_dev =
devm_hwmon_device_register_with_info(dev, client->name, data,
&nct7904_chip_info, NULL);
- return PTR_ERR_OR_ZERO(hwmon_dev);
+ ret = PTR_ERR_OR_ZERO(hwmon_dev);
+ if (ret)
+ return ret;
+
+ /* Watchdog initialization */
+ data->wdt.ops = &nct7904_wdt_ops;
+ data->wdt.info = &nct7904_wdt_info;
+
+ data->wdt.timeout = timeout * 60; /* in seconds */
+ data->wdt.min_timeout = 1;
+ data->wdt.max_timeout = 15300;
+ data->wdt.parent = &client->dev;
+
+ watchdog_init_timeout(&data->wdt, timeout, &client->dev);
+ watchdog_set_nowayout(&data->wdt, nowayout);
+ watchdog_set_drvdata(&data->wdt, data);
+
+ i2c_set_clientdata(client, data);
+
+ ret = watchdog_register_device(&data->wdt);
+ if (ret)
+ return ret;
+
+ dev_info(&client->dev, "NCT7904 HWMON and Watchdog device probed\n");
+
+ return ret;
+}
+
+static int nct7904_remove(struct i2c_client *client)
+{
+ /*
+ * HWMON use devm_hwmon_device_register_with_info() register. So, do
+ * not need unregister it manually.
+ */
+ struct nct7904_data *data = i2c_get_clientdata(client);
+
+ /* disable watchdog */
+ if (!nowayout)
+ nct7904_write_reg(data, BANK_0, WDT_LOCK_REG, WDT_SOFT_DIS);
+
+ watchdog_unregister_device(&data->wdt);
+
+ dev_info(&client->dev, "NCT7904 driver removed\n");
+
+ return 0;
}
static const struct i2c_device_id nct7904_id[] = {
@@ -1030,6 +1184,7 @@ static int nct7904_probe(struct i2c_client *client,
.id_table = nct7904_id,
.detect = nct7904_detect,
.address_list = normal_i2c,
+ .remove = nct7904_remove,
};
module_i2c_driver(nct7904_driver);
--
1.8.3.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [v1,1/1] hwmon: (nct7904) Add watchdog function
2020-03-24 1:46 [v1,1/1] hwmon: (nct7904) Add watchdog function yuechao.zhao
@ 2020-03-24 16:49 ` kbuild test robot
0 siblings, 0 replies; 2+ messages in thread
From: kbuild test robot @ 2020-03-24 16:49 UTC (permalink / raw)
To: yuechao.zhao
Cc: kbuild-all, 345351830@qq.com, Jean Delvare, Guenter Roeck,
linux-hwmon, linux-kernel, amy.shih, oakley.ding, jia.sui,
shengkui.leng, Yuechao Zhao
[-- Attachment #1: Type: text/plain, Size: 1646 bytes --]
Hi,
Thank you for the patch! Yet something to improve:
[auto build test ERROR on hwmon/hwmon-next]
[also build test ERROR on next-20200324]
[cannot apply to v5.6-rc7]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see https://stackoverflow.com/a/37406982]
url: https://github.com/0day-ci/linux/commits/yuechao-zhao-advantech-com-cn/hwmon-nct7904-Add-watchdog-function/20200324-095738
base: https://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging.git hwmon-next
config: h8300-randconfig-a001-20200324 (attached as .config)
compiler: h8300-linux-gcc (GCC) 9.2.0
reproduce:
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# save the attached .config to linux build tree
GCC_VERSION=9.2.0 make.cross ARCH=h8300
If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@intel.com>
All errors (new ones prefixed by >>):
h8300-linux-ld: drivers/hwmon/nct7904.o: in function `nct7904_remove':
drivers/hwmon/nct7904.c:1165: undefined reference to `watchdog_unregister_device'
h8300-linux-ld: drivers/hwmon/nct7904.o: in function `nct7904_probe':
drivers/hwmon/nct7904.c:1138: undefined reference to `watchdog_init_timeout'
>> h8300-linux-ld: drivers/hwmon/nct7904.c:1144: undefined reference to `watchdog_register_device'
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
[-- Attachment #2: .config.gz --]
[-- Type: application/gzip, Size: 26148 bytes --]
^ permalink raw reply [flat|nested] 2+ messages in thread
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