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hwmon: add generic GPIO fan driver

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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>
This commit is contained in:
Simon Guinot
2010-10-22 00:44:19 +02:00
committed by Guenter Roeck
parent 3247800676
commit d6fe1360f4
4 changed files with 604 additions and 0 deletions
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36
include/linux/gpio-fan.h Normal file
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/*
* 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 */