forked from Minki/linux
hwmon: (fschmd) Add watchdog support
This patch adds support for the watchdog part found in _all_ supported FSC sensor chips. Signed-off-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Jean Delvare <khali@linux-fr.org>
This commit is contained in:
Hans de Goede
Jean Delvare
parent
453e308d77
commit
97950c3d42
@ -329,10 +329,11 @@ config SENSORS_FSCHMD
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depends on X86 && I2C && EXPERIMENTAL
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help
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If you say yes here you get support for various Fujitsu Siemens
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Computers sensor chips.
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Computers sensor chips, including support for the integrated
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watchdog.
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This is a new merged driver for FSC sensor chips which is intended
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as a replacment for the fscpos, fscscy and fscher drivers and adds
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as a replacement for the fscpos, fscscy and fscher drivers and adds
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support for several other FCS sensor chips.
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This driver can also be built as a module. If so, the module
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@ -42,11 +42,20 @@
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#include <linux/mutex.h>
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#include <linux/sysfs.h>
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#include <linux/dmi.h>
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#include <linux/fs.h>
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#include <linux/watchdog.h>
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#include <linux/miscdevice.h>
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#include <linux/uaccess.h>
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#include <linux/kref.h>
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/* Addresses to scan */
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static const unsigned short normal_i2c[] = { 0x73, I2C_CLIENT_END };
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/* Insmod parameters */
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static int nowayout = WATCHDOG_NOWAYOUT;
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module_param(nowayout, int, 0);
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MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
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__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
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I2C_CLIENT_INSMOD_5(fscpos, fscher, fscscy, fschrc, fschmd);
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/*
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@ -65,11 +74,18 @@ I2C_CLIENT_INSMOD_5(fscpos, fscher, fscscy, fschrc, fschmd);
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#define FSCHMD_CONTROL_ALERT_LED 0x01
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/* watchdog (support to be implemented) */
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/* watchdog */
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#define FSCHMD_REG_WDOG_PRESET 0x28
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#define FSCHMD_REG_WDOG_STATE 0x23
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#define FSCHMD_REG_WDOG_CONTROL 0x21
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#define FSCHMD_WDOG_CONTROL_TRIGGER 0x10
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#define FSCHMD_WDOG_CONTROL_STARTED 0x10 /* the same as trigger */
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#define FSCHMD_WDOG_CONTROL_STOP 0x20
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#define FSCHMD_WDOG_CONTROL_RESOLUTION 0x40
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#define FSCHMD_WDOG_STATE_CARDRESET 0x02
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/* voltages, weird order is to keep the same order as the old drivers */
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static const u8 FSCHMD_REG_VOLT[3] = { 0x45, 0x42, 0x48 };
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@ -206,14 +222,26 @@ static struct i2c_driver fschmd_driver = {
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*/
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struct fschmd_data {
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struct i2c_client *client;
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struct device *hwmon_dev;
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struct mutex update_lock;
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struct mutex watchdog_lock;
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struct list_head list; /* member of the watchdog_data_list */
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struct kref kref;
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struct miscdevice watchdog_miscdev;
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int kind;
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unsigned long watchdog_is_open;
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char watchdog_expect_close;
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char watchdog_name[10]; /* must be unique to avoid sysfs conflict */
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char valid; /* zero until following fields are valid */
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unsigned long last_updated; /* in jiffies */
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/* register values */
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u8 revision; /* chip revision */
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u8 global_control; /* global control register */
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u8 watchdog_control; /* watchdog control register */
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u8 watchdog_state; /* watchdog status register */
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u8 watchdog_preset; /* watchdog counter preset on trigger val */
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u8 volt[3]; /* 12, 5, battery voltage */
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u8 temp_act[5]; /* temperature */
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u8 temp_status[5]; /* status of sensor */
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@ -225,11 +253,28 @@ struct fschmd_data {
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};
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/* Global variables to hold information read from special DMI tables, which are
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available on FSC machines with an fscher or later chip. */
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available on FSC machines with an fscher or later chip. There is no need to
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protect these with a lock as they are only modified from our attach function
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which always gets called with the i2c-core lock held and never accessed
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before the attach function is done with them. */
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static int dmi_mult[3] = { 490, 200, 100 };
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static int dmi_offset[3] = { 0, 0, 0 };
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static int dmi_vref = -1;
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/* Somewhat ugly :( global data pointer list with all fschmd devices, so that
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we can find our device data as when using misc_register there is no other
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method to get to ones device data from the open fop. */
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static LIST_HEAD(watchdog_data_list);
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/* Note this lock not only protect list access, but also data.kref access */
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static DEFINE_MUTEX(watchdog_data_mutex);
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/* Release our data struct when we're detached from the i2c client *and* all
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references to our watchdog device are released */
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static void fschmd_release_resources(struct kref *ref)
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{
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struct fschmd_data *data = container_of(ref, struct fschmd_data, kref);
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kfree(data);
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}
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/*
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* Sysfs attr show / store functions
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@ -548,7 +593,265 @@ static struct sensor_device_attribute fschmd_fan_attr[] = {
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/*
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* Real code
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* Watchdog routines
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*/
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static int watchdog_set_timeout(struct fschmd_data *data, int timeout)
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{
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int ret, resolution;
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int kind = data->kind + 1; /* 0-x array index -> 1-x module param */
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/* 2 second or 60 second resolution? */
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if (timeout <= 510 || kind == fscpos || kind == fscscy)
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resolution = 2;
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else
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resolution = 60;
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if (timeout < resolution || timeout > (resolution * 255))
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return -EINVAL;
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mutex_lock(&data->watchdog_lock);
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if (!data->client) {
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ret = -ENODEV;
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goto leave;
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}
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if (resolution == 2)
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data->watchdog_control &= ~FSCHMD_WDOG_CONTROL_RESOLUTION;
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else
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data->watchdog_control |= FSCHMD_WDOG_CONTROL_RESOLUTION;
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data->watchdog_preset = DIV_ROUND_UP(timeout, resolution);
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/* Write new timeout value */
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i2c_smbus_write_byte_data(data->client, FSCHMD_REG_WDOG_PRESET,
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data->watchdog_preset);
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/* Write new control register, do not trigger! */
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i2c_smbus_write_byte_data(data->client, FSCHMD_REG_WDOG_CONTROL,
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data->watchdog_control & ~FSCHMD_WDOG_CONTROL_TRIGGER);
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ret = data->watchdog_preset * resolution;
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leave:
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mutex_unlock(&data->watchdog_lock);
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return ret;
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}
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static int watchdog_get_timeout(struct fschmd_data *data)
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{
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int timeout;
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mutex_lock(&data->watchdog_lock);
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if (data->watchdog_control & FSCHMD_WDOG_CONTROL_RESOLUTION)
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timeout = data->watchdog_preset * 60;
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else
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timeout = data->watchdog_preset * 2;
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mutex_unlock(&data->watchdog_lock);
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return timeout;
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}
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static int watchdog_trigger(struct fschmd_data *data)
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{
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int ret = 0;
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mutex_lock(&data->watchdog_lock);
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if (!data->client) {
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ret = -ENODEV;
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goto leave;
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}
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data->watchdog_control |= FSCHMD_WDOG_CONTROL_TRIGGER;
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i2c_smbus_write_byte_data(data->client, FSCHMD_REG_WDOG_CONTROL,
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data->watchdog_control);
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leave:
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mutex_unlock(&data->watchdog_lock);
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return ret;
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}
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static int watchdog_stop(struct fschmd_data *data)
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{
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int ret = 0;
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mutex_lock(&data->watchdog_lock);
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if (!data->client) {
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ret = -ENODEV;
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goto leave;
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}
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data->watchdog_control &= ~FSCHMD_WDOG_CONTROL_STARTED;
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/* Don't store the stop flag in our watchdog control register copy, as
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its a write only bit (read always returns 0) */
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i2c_smbus_write_byte_data(data->client, FSCHMD_REG_WDOG_CONTROL,
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data->watchdog_control | FSCHMD_WDOG_CONTROL_STOP);
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leave:
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mutex_unlock(&data->watchdog_lock);
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return ret;
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}
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static int watchdog_open(struct inode *inode, struct file *filp)
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{
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struct fschmd_data *pos, *data = NULL;
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/* We get called from drivers/char/misc.c with misc_mtx hold, and we
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call misc_register() from fschmd_probe() with watchdog_data_mutex
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hold, as misc_register() takes the misc_mtx lock, this is a possible
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deadlock, so we use mutex_trylock here. */
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if (!mutex_trylock(&watchdog_data_mutex))
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return -ERESTARTSYS;
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list_for_each_entry(pos, &watchdog_data_list, list) {
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if (pos->watchdog_miscdev.minor == iminor(inode)) {
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data = pos;
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break;
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}
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}
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/* Note we can never not have found data, so we don't check for this */
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kref_get(&data->kref);
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mutex_unlock(&watchdog_data_mutex);
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if (test_and_set_bit(0, &data->watchdog_is_open))
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return -EBUSY;
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/* Start the watchdog */
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watchdog_trigger(data);
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filp->private_data = data;
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return nonseekable_open(inode, filp);
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}
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static int watchdog_release(struct inode *inode, struct file *filp)
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{
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struct fschmd_data *data = filp->private_data;
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if (data->watchdog_expect_close) {
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watchdog_stop(data);
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data->watchdog_expect_close = 0;
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} else {
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watchdog_trigger(data);
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dev_crit(&data->client->dev,
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"unexpected close, not stopping watchdog!\n");
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}
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clear_bit(0, &data->watchdog_is_open);
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mutex_lock(&watchdog_data_mutex);
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kref_put(&data->kref, fschmd_release_resources);
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mutex_unlock(&watchdog_data_mutex);
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return 0;
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}
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static ssize_t watchdog_write(struct file *filp, const char __user *buf,
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size_t count, loff_t *offset)
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{
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size_t ret;
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struct fschmd_data *data = filp->private_data;
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if (count) {
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if (!nowayout) {
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size_t i;
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/* Clear it in case it was set with a previous write */
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data->watchdog_expect_close = 0;
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for (i = 0; i != count; i++) {
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char c;
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if (get_user(c, buf + i))
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return -EFAULT;
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if (c == 'V')
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data->watchdog_expect_close = 1;
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}
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}
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ret = watchdog_trigger(data);
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if (ret < 0)
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return ret;
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}
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return count;
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}
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static int watchdog_ioctl(struct inode *inode, struct file *filp,
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unsigned int cmd, unsigned long arg)
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{
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static struct watchdog_info ident = {
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.options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT |
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WDIOF_CARDRESET,
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.identity = "FSC watchdog"
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};
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int i, ret = 0;
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struct fschmd_data *data = filp->private_data;
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switch (cmd) {
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case WDIOC_GETSUPPORT:
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ident.firmware_version = data->revision;
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if (!nowayout)
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ident.options |= WDIOF_MAGICCLOSE;
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if (copy_to_user((void __user *)arg, &ident, sizeof(ident)))
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ret = -EFAULT;
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break;
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case WDIOC_GETSTATUS:
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ret = put_user(0, (int __user *)arg);
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break;
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case WDIOC_GETBOOTSTATUS:
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if (data->watchdog_state & FSCHMD_WDOG_STATE_CARDRESET)
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ret = put_user(WDIOF_CARDRESET, (int __user *)arg);
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else
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ret = put_user(0, (int __user *)arg);
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break;
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case WDIOC_KEEPALIVE:
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ret = watchdog_trigger(data);
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break;
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case WDIOC_GETTIMEOUT:
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i = watchdog_get_timeout(data);
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ret = put_user(i, (int __user *)arg);
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break;
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case WDIOC_SETTIMEOUT:
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if (get_user(i, (int __user *)arg)) {
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ret = -EFAULT;
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break;
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}
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ret = watchdog_set_timeout(data, i);
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if (ret > 0)
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ret = put_user(ret, (int __user *)arg);
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break;
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case WDIOC_SETOPTIONS:
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if (get_user(i, (int __user *)arg)) {
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ret = -EFAULT;
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break;
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}
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if (i & WDIOS_DISABLECARD)
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ret = watchdog_stop(data);
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else if (i & WDIOS_ENABLECARD)
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ret = watchdog_trigger(data);
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else
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ret = -EINVAL;
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break;
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default:
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ret = -ENOTTY;
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}
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return ret;
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}
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static struct file_operations watchdog_fops = {
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.owner = THIS_MODULE,
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.llseek = no_llseek,
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.open = watchdog_open,
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.release = watchdog_release,
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.write = watchdog_write,
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.ioctl = watchdog_ioctl,
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};
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/*
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* Detect, register, unregister and update device functions
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*/
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/* DMI decode routine to read voltage scaling factors from special DMI tables,
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@ -658,9 +961,9 @@ static int fschmd_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct fschmd_data *data;
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u8 revision;
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const char * const names[5] = { "Poseidon", "Hermes", "Scylla",
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"Heracles", "Heimdall" };
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const int watchdog_minors[] = { WATCHDOG_MINOR, 212, 213, 214, 215 };
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int i, err;
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enum chips kind = id->driver_data;
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@ -670,6 +973,13 @@ static int fschmd_probe(struct i2c_client *client,
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i2c_set_clientdata(client, data);
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mutex_init(&data->update_lock);
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mutex_init(&data->watchdog_lock);
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INIT_LIST_HEAD(&data->list);
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kref_init(&data->kref);
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/* Store client pointer in our data struct for watchdog usage
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(where the client is found through a data ptr instead of the
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otherway around) */
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data->client = client;
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if (kind == fscpos) {
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/* The Poseidon has hardwired temp limits, fill these
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@ -690,6 +1000,17 @@ static int fschmd_probe(struct i2c_client *client,
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}
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}
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/* Read in some never changing registers */
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data->revision = i2c_smbus_read_byte_data(client, FSCHMD_REG_REVISION);
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data->global_control = i2c_smbus_read_byte_data(client,
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FSCHMD_REG_CONTROL);
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data->watchdog_control = i2c_smbus_read_byte_data(client,
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FSCHMD_REG_WDOG_CONTROL);
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data->watchdog_state = i2c_smbus_read_byte_data(client,
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FSCHMD_REG_WDOG_STATE);
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data->watchdog_preset = i2c_smbus_read_byte_data(client,
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FSCHMD_REG_WDOG_PRESET);
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/* i2c kind goes from 1-5, we want from 0-4 to address arrays */
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data->kind = kind - 1;
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@ -732,9 +1053,43 @@ static int fschmd_probe(struct i2c_client *client,
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goto exit_detach;
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}
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revision = i2c_smbus_read_byte_data(client, FSCHMD_REG_REVISION);
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/* We take the data_mutex lock early so that watchdog_open() cannot
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run when misc_register() has completed, but we've not yet added
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our data to the watchdog_data_list (and set the default timeout) */
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mutex_lock(&watchdog_data_mutex);
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for (i = 0; i < ARRAY_SIZE(watchdog_minors); i++) {
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/* Register our watchdog part */
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snprintf(data->watchdog_name, sizeof(data->watchdog_name),
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"watchdog%c", (i == 0) ? '\0' : ('0' + i));
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data->watchdog_miscdev.name = data->watchdog_name;
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data->watchdog_miscdev.fops = &watchdog_fops;
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data->watchdog_miscdev.minor = watchdog_minors[i];
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err = misc_register(&data->watchdog_miscdev);
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if (err == -EBUSY)
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continue;
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if (err) {
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data->watchdog_miscdev.minor = 0;
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dev_err(&client->dev,
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"Registering watchdog chardev: %d\n", err);
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break;
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}
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list_add(&data->list, &watchdog_data_list);
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watchdog_set_timeout(data, 60);
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dev_info(&client->dev,
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"Registered watchdog chardev major 10, minor: %d\n",
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watchdog_minors[i]);
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break;
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}
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if (i == ARRAY_SIZE(watchdog_minors)) {
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data->watchdog_miscdev.minor = 0;
|
||||
dev_warn(&client->dev, "Couldn't register watchdog chardev "
|
||||
"(due to no free minor)\n");
|
||||
}
|
||||
mutex_unlock(&watchdog_data_mutex);
|
||||
|
||||
dev_info(&client->dev, "Detected FSC %s chip, revision: %d\n",
|
||||
names[data->kind], (int) revision);
|
||||
names[data->kind], (int) data->revision);
|
||||
|
||||
return 0;
|
||||
|
||||
@ -748,6 +1103,24 @@ static int fschmd_remove(struct i2c_client *client)
|
||||
struct fschmd_data *data = i2c_get_clientdata(client);
|
||||
int i;
|
||||
|
||||
/* Unregister the watchdog (if registered) */
|
||||
if (data->watchdog_miscdev.minor) {
|
||||
misc_deregister(&data->watchdog_miscdev);
|
||||
if (data->watchdog_is_open) {
|
||||
dev_warn(&client->dev,
|
||||
"i2c client detached with watchdog open! "
|
||||
"Stopping watchdog.\n");
|
||||
watchdog_stop(data);
|
||||
}
|
||||
mutex_lock(&watchdog_data_mutex);
|
||||
list_del(&data->list);
|
||||
mutex_unlock(&watchdog_data_mutex);
|
||||
/* Tell the watchdog code the client is gone */
|
||||
mutex_lock(&data->watchdog_lock);
|
||||
data->client = NULL;
|
||||
mutex_unlock(&data->watchdog_lock);
|
||||
}
|
||||
|
||||
/* Check if registered in case we're called from fschmd_detect
|
||||
to cleanup after an error */
|
||||
if (data->hwmon_dev)
|
||||
@ -762,7 +1135,10 @@ static int fschmd_remove(struct i2c_client *client)
|
||||
device_remove_file(&client->dev,
|
||||
&fschmd_fan_attr[i].dev_attr);
|
||||
|
||||
kfree(data);
|
||||
mutex_lock(&watchdog_data_mutex);
|
||||
kref_put(&data->kref, fschmd_release_resources);
|
||||
mutex_unlock(&watchdog_data_mutex);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
@ -824,17 +1200,6 @@ static struct fschmd_data *fschmd_update_device(struct device *dev)
|
||||
data->volt[i] = i2c_smbus_read_byte_data(client,
|
||||
FSCHMD_REG_VOLT[i]);
|
||||
|
||||
data->global_control = i2c_smbus_read_byte_data(client,
|
||||
FSCHMD_REG_CONTROL);
|
||||
|
||||
/* To be implemented in the future
|
||||
data->watchdog[0] = i2c_smbus_read_byte_data(client,
|
||||
FSCHMD_REG_WDOG_PRESET);
|
||||
data->watchdog[1] = i2c_smbus_read_byte_data(client,
|
||||
FSCHMD_REG_WDOG_STATE);
|
||||
data->watchdog[2] = i2c_smbus_read_byte_data(client,
|
||||
FSCHMD_REG_WDOG_CONTROL); */
|
||||
|
||||
data->last_updated = jiffies;
|
||||
data->valid = 1;
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user