diff options
| author | Simon Guinot <sguinot@lacie.com> | 2010-10-22 00:44:19 +0200 |
|---|---|---|
| committer | Guenter Roeck <guenter.roeck@ericsson.com> | 2010-10-25 14:11:37 -0700 |
| commit | d6fe1360f42e86262153927986dea6502daff703 (patch) | |
| tree | adaf8f6da75353dacc4d1d05ff4a042d6c9c0b11 /include/linux/gpio-fan.h | |
| parent | 3247800676c4a04352cde72b9935b57ffc72ce15 (diff) | |
| download | lwn-d6fe1360f42e86262153927986dea6502daff703.tar.gz lwn-d6fe1360f42e86262153927986dea6502daff703.zip | |
hwmon: add generic GPIO fan driver
This patch adds hwmon support for fans connected to GPIO lines.
Platform specific information such as GPIO pinout and speed conversion array
(rpm from/to GPIO value) are passed to the driver via platform_data.
Signed-off-by: Simon Guinot <sguinot@lacie.com>
Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
Diffstat (limited to 'include/linux/gpio-fan.h')
| -rw-r--r-- | include/linux/gpio-fan.h | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/include/linux/gpio-fan.h b/include/linux/gpio-fan.h new file mode 100644 index 000000000000..096659169215 --- /dev/null +++ b/include/linux/gpio-fan.h @@ -0,0 +1,36 @@ +/* + * include/linux/gpio-fan.h + * + * Platform data structure for GPIO fan driver + * + * This file is licensed under the terms of the GNU General Public + * License version 2. This program is licensed "as is" without any + * warranty of any kind, whether express or implied. + */ + +#ifndef __LINUX_GPIO_FAN_H +#define __LINUX_GPIO_FAN_H + +struct gpio_fan_alarm { + unsigned gpio; + unsigned active_low; +}; + +struct gpio_fan_speed { + int rpm; + int ctrl_val; +}; + +struct gpio_fan_platform_data { + int num_ctrl; + unsigned *ctrl; /* fan control GPIOs. */ + struct gpio_fan_alarm *alarm; /* fan alarm GPIO. */ + /* + * Speed conversion array: rpm from/to GPIO bit field. + * This array _must_ be sorted in ascending rpm order. + */ + int num_speed; + struct gpio_fan_speed *speed; +}; + +#endif /* __LINUX_GPIO_FAN_H */ |