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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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drivers/hwmon/Kconfig
+9
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@@ -399,6 +399,15 @@ config SENSORS_GL520SM
This driver can also be built as a module. If so, the module
will be called gl520sm.
config SENSORS_GPIO_FAN
tristate "GPIO fan"
depends on GENERIC_GPIO
help
If you say yes here you get support for fans connected to GPIO lines.
This driver can also be built as a module. If so, the module
will be called gpio-fan.
config SENSORS_CORETEMP
tristate "Intel Core/Core2/Atom temperature sensor"
depends on X86 && PCI && EXPERIMENTAL
drivers/hwmon/Makefile
+1
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@@ -51,6 +51,7 @@ obj-$(CONFIG_SENSORS_FSCHMD) += fschmd.o
obj-$(CONFIG_SENSORS_G760A) += g760a.o
obj-$(CONFIG_SENSORS_GL518SM) += gl518sm.o
obj-$(CONFIG_SENSORS_GL520SM) += gl520sm.o
obj-$(CONFIG_SENSORS_GPIO_FAN) += gpio-fan.o
obj-$(CONFIG_SENSORS_ULTRA45) += ultra45_env.o
obj-$(CONFIG_SENSORS_I5K_AMB) += i5k_amb.o
obj-$(CONFIG_SENSORS_IBMAEM) += ibmaem.o
drivers/hwmon/gpio-fan.c
+558
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File diff suppressed because it is too large Load Diff
include/linux/gpio-fan.h
+36
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@@ -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 */