linux-stable/include/linux/gpio-fan.h
Simon Guinot d6fe1360f4 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>
2010-10-25 14:11:37 -07:00

36 lines
802 B
C

/*
* 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 */