mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-24 09:50:04 +00:00
![Kees Cook](/assets/img/avatar_default.png)
The devm_kzalloc() function has a 2-factor argument form, devm_kcalloc(). This patch replaces cases of: devm_kzalloc(handle, a * b, gfp) with: devm_kcalloc(handle, a * b, gfp) as well as handling cases of: devm_kzalloc(handle, a * b * c, gfp) with: devm_kzalloc(handle, array3_size(a, b, c), gfp) as it's slightly less ugly than: devm_kcalloc(handle, array_size(a, b), c, gfp) This does, however, attempt to ignore constant size factors like: devm_kzalloc(handle, 4 * 1024, gfp) though any constants defined via macros get caught up in the conversion. Any factors with a sizeof() of "unsigned char", "char", and "u8" were dropped, since they're redundant. Some manual whitespace fixes were needed in this patch, as Coccinelle really liked to write "=devm_kcalloc..." instead of "= devm_kcalloc...". The Coccinelle script used for this was: // Fix redundant parens around sizeof(). @@ expression HANDLE; type TYPE; expression THING, E; @@ ( devm_kzalloc(HANDLE, - (sizeof(TYPE)) * E + sizeof(TYPE) * E , ...) | devm_kzalloc(HANDLE, - (sizeof(THING)) * E + sizeof(THING) * E , ...) ) // Drop single-byte sizes and redundant parens. @@ expression HANDLE; expression COUNT; typedef u8; typedef __u8; @@ ( devm_kzalloc(HANDLE, - sizeof(u8) * (COUNT) + COUNT , ...) | devm_kzalloc(HANDLE, - sizeof(__u8) * (COUNT) + COUNT , ...) | devm_kzalloc(HANDLE, - sizeof(char) * (COUNT) + COUNT , ...) | devm_kzalloc(HANDLE, - sizeof(unsigned char) * (COUNT) + COUNT , ...) | devm_kzalloc(HANDLE, - sizeof(u8) * COUNT + COUNT , ...) | devm_kzalloc(HANDLE, - sizeof(__u8) * COUNT + COUNT , ...) | devm_kzalloc(HANDLE, - sizeof(char) * COUNT + COUNT , ...) | devm_kzalloc(HANDLE, - sizeof(unsigned char) * COUNT + COUNT , ...) ) // 2-factor product with sizeof(type/expression) and identifier or constant. @@ expression HANDLE; type TYPE; expression THING; identifier COUNT_ID; constant COUNT_CONST; @@ ( - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(TYPE) * (COUNT_ID) + COUNT_ID, sizeof(TYPE) , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(TYPE) * COUNT_ID + COUNT_ID, sizeof(TYPE) , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(TYPE) * (COUNT_CONST) + COUNT_CONST, sizeof(TYPE) , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(TYPE) * COUNT_CONST + COUNT_CONST, sizeof(TYPE) , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(THING) * (COUNT_ID) + COUNT_ID, sizeof(THING) , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(THING) * COUNT_ID + COUNT_ID, sizeof(THING) , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(THING) * (COUNT_CONST) + COUNT_CONST, sizeof(THING) , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(THING) * COUNT_CONST + COUNT_CONST, sizeof(THING) , ...) ) // 2-factor product, only identifiers. @@ expression HANDLE; identifier SIZE, COUNT; @@ - devm_kzalloc + devm_kcalloc (HANDLE, - SIZE * COUNT + COUNT, SIZE , ...) // 3-factor product with 1 sizeof(type) or sizeof(expression), with // redundant parens removed. @@ expression HANDLE; expression THING; identifier STRIDE, COUNT; type TYPE; @@ ( devm_kzalloc(HANDLE, - sizeof(TYPE) * (COUNT) * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | devm_kzalloc(HANDLE, - sizeof(TYPE) * (COUNT) * STRIDE + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | devm_kzalloc(HANDLE, - sizeof(TYPE) * COUNT * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | devm_kzalloc(HANDLE, - sizeof(TYPE) * COUNT * STRIDE + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | devm_kzalloc(HANDLE, - sizeof(THING) * (COUNT) * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) | devm_kzalloc(HANDLE, - sizeof(THING) * (COUNT) * STRIDE + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) | devm_kzalloc(HANDLE, - sizeof(THING) * COUNT * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) | devm_kzalloc(HANDLE, - sizeof(THING) * COUNT * STRIDE + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) ) // 3-factor product with 2 sizeof(variable), with redundant parens removed. @@ expression HANDLE; expression THING1, THING2; identifier COUNT; type TYPE1, TYPE2; @@ ( devm_kzalloc(HANDLE, - sizeof(TYPE1) * sizeof(TYPE2) * COUNT + array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2)) , ...) | devm_kzalloc(HANDLE, - sizeof(TYPE1) * sizeof(THING2) * (COUNT) + array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2)) , ...) | devm_kzalloc(HANDLE, - sizeof(THING1) * sizeof(THING2) * COUNT + array3_size(COUNT, sizeof(THING1), sizeof(THING2)) , ...) | devm_kzalloc(HANDLE, - sizeof(THING1) * sizeof(THING2) * (COUNT) + array3_size(COUNT, sizeof(THING1), sizeof(THING2)) , ...) | devm_kzalloc(HANDLE, - sizeof(TYPE1) * sizeof(THING2) * COUNT + array3_size(COUNT, sizeof(TYPE1), sizeof(THING2)) , ...) | devm_kzalloc(HANDLE, - sizeof(TYPE1) * sizeof(THING2) * (COUNT) + array3_size(COUNT, sizeof(TYPE1), sizeof(THING2)) , ...) ) // 3-factor product, only identifiers, with redundant parens removed. @@ expression HANDLE; identifier STRIDE, SIZE, COUNT; @@ ( devm_kzalloc(HANDLE, - (COUNT) * STRIDE * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) | devm_kzalloc(HANDLE, - COUNT * (STRIDE) * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) | devm_kzalloc(HANDLE, - COUNT * STRIDE * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | devm_kzalloc(HANDLE, - (COUNT) * (STRIDE) * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) | devm_kzalloc(HANDLE, - COUNT * (STRIDE) * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | devm_kzalloc(HANDLE, - (COUNT) * STRIDE * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | devm_kzalloc(HANDLE, - (COUNT) * (STRIDE) * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | devm_kzalloc(HANDLE, - COUNT * STRIDE * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) ) // Any remaining multi-factor products, first at least 3-factor products, // when they're not all constants... @@ expression HANDLE; expression E1, E2, E3; constant C1, C2, C3; @@ ( devm_kzalloc(HANDLE, C1 * C2 * C3, ...) | devm_kzalloc(HANDLE, - (E1) * E2 * E3 + array3_size(E1, E2, E3) , ...) | devm_kzalloc(HANDLE, - (E1) * (E2) * E3 + array3_size(E1, E2, E3) , ...) | devm_kzalloc(HANDLE, - (E1) * (E2) * (E3) + array3_size(E1, E2, E3) , ...) | devm_kzalloc(HANDLE, - E1 * E2 * E3 + array3_size(E1, E2, E3) , ...) ) // And then all remaining 2 factors products when they're not all constants, // keeping sizeof() as the second factor argument. @@ expression HANDLE; expression THING, E1, E2; type TYPE; constant C1, C2, C3; @@ ( devm_kzalloc(HANDLE, sizeof(THING) * C2, ...) | devm_kzalloc(HANDLE, sizeof(TYPE) * C2, ...) | devm_kzalloc(HANDLE, C1 * C2 * C3, ...) | devm_kzalloc(HANDLE, C1 * C2, ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(TYPE) * (E2) + E2, sizeof(TYPE) , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(TYPE) * E2 + E2, sizeof(TYPE) , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(THING) * (E2) + E2, sizeof(THING) , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(THING) * E2 + E2, sizeof(THING) , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - (E1) * E2 + E1, E2 , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - (E1) * (E2) + E1, E2 , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - E1 * E2 + E1, E2 , ...) ) Signed-off-by: Kees Cook <keescook@chromium.org>
619 lines
15 KiB
C
619 lines
15 KiB
C
/*
|
|
* gpio-fan.c - Hwmon driver for fans connected to GPIO lines.
|
|
*
|
|
* Copyright (C) 2010 LaCie
|
|
*
|
|
* Author: Simon Guinot <sguinot@lacie.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/irq.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/err.h>
|
|
#include <linux/mutex.h>
|
|
#include <linux/hwmon.h>
|
|
#include <linux/gpio/consumer.h>
|
|
#include <linux/of.h>
|
|
#include <linux/of_platform.h>
|
|
#include <linux/thermal.h>
|
|
|
|
struct gpio_fan_speed {
|
|
int rpm;
|
|
int ctrl_val;
|
|
};
|
|
|
|
struct gpio_fan_data {
|
|
struct device *dev;
|
|
struct device *hwmon_dev;
|
|
/* Cooling device if any */
|
|
struct thermal_cooling_device *cdev;
|
|
struct mutex lock; /* lock GPIOs operations. */
|
|
int num_gpios;
|
|
struct gpio_desc **gpios;
|
|
int num_speed;
|
|
struct gpio_fan_speed *speed;
|
|
int speed_index;
|
|
#ifdef CONFIG_PM_SLEEP
|
|
int resume_speed;
|
|
#endif
|
|
bool pwm_enable;
|
|
struct gpio_desc *alarm_gpio;
|
|
struct work_struct alarm_work;
|
|
};
|
|
|
|
/*
|
|
* Alarm GPIO.
|
|
*/
|
|
|
|
static void fan_alarm_notify(struct work_struct *ws)
|
|
{
|
|
struct gpio_fan_data *fan_data =
|
|
container_of(ws, struct gpio_fan_data, alarm_work);
|
|
|
|
sysfs_notify(&fan_data->dev->kobj, NULL, "fan1_alarm");
|
|
kobject_uevent(&fan_data->dev->kobj, KOBJ_CHANGE);
|
|
}
|
|
|
|
static irqreturn_t fan_alarm_irq_handler(int irq, void *dev_id)
|
|
{
|
|
struct gpio_fan_data *fan_data = dev_id;
|
|
|
|
schedule_work(&fan_data->alarm_work);
|
|
|
|
return IRQ_NONE;
|
|
}
|
|
|
|
static ssize_t fan1_alarm_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
|
|
|
|
return sprintf(buf, "%d\n",
|
|
gpiod_get_value_cansleep(fan_data->alarm_gpio));
|
|
}
|
|
|
|
static DEVICE_ATTR_RO(fan1_alarm);
|
|
|
|
static int fan_alarm_init(struct gpio_fan_data *fan_data)
|
|
{
|
|
int alarm_irq;
|
|
struct device *dev = fan_data->dev;
|
|
|
|
/*
|
|
* If the alarm GPIO don't support interrupts, just leave
|
|
* without initializing the fail notification support.
|
|
*/
|
|
alarm_irq = gpiod_to_irq(fan_data->alarm_gpio);
|
|
if (alarm_irq <= 0)
|
|
return 0;
|
|
|
|
INIT_WORK(&fan_data->alarm_work, fan_alarm_notify);
|
|
irq_set_irq_type(alarm_irq, IRQ_TYPE_EDGE_BOTH);
|
|
return devm_request_irq(dev, alarm_irq, fan_alarm_irq_handler,
|
|
IRQF_SHARED, "GPIO fan alarm", fan_data);
|
|
}
|
|
|
|
/*
|
|
* Control GPIOs.
|
|
*/
|
|
|
|
/* Must be called with fan_data->lock held, except during initialization. */
|
|
static void __set_fan_ctrl(struct gpio_fan_data *fan_data, int ctrl_val)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < fan_data->num_gpios; i++)
|
|
gpiod_set_value_cansleep(fan_data->gpios[i],
|
|
(ctrl_val >> i) & 1);
|
|
}
|
|
|
|
static int __get_fan_ctrl(struct gpio_fan_data *fan_data)
|
|
{
|
|
int i;
|
|
int ctrl_val = 0;
|
|
|
|
for (i = 0; i < fan_data->num_gpios; i++) {
|
|
int value;
|
|
|
|
value = gpiod_get_value_cansleep(fan_data->gpios[i]);
|
|
ctrl_val |= (value << i);
|
|
}
|
|
return ctrl_val;
|
|
}
|
|
|
|
/* Must be called with fan_data->lock held, except during initialization. */
|
|
static void set_fan_speed(struct gpio_fan_data *fan_data, int speed_index)
|
|
{
|
|
if (fan_data->speed_index == speed_index)
|
|
return;
|
|
|
|
__set_fan_ctrl(fan_data, fan_data->speed[speed_index].ctrl_val);
|
|
fan_data->speed_index = speed_index;
|
|
}
|
|
|
|
static int get_fan_speed_index(struct gpio_fan_data *fan_data)
|
|
{
|
|
int ctrl_val = __get_fan_ctrl(fan_data);
|
|
int i;
|
|
|
|
for (i = 0; i < fan_data->num_speed; i++)
|
|
if (fan_data->speed[i].ctrl_val == ctrl_val)
|
|
return i;
|
|
|
|
dev_warn(fan_data->dev,
|
|
"missing speed array entry for GPIO value 0x%x\n", ctrl_val);
|
|
|
|
return -ENODEV;
|
|
}
|
|
|
|
static int rpm_to_speed_index(struct gpio_fan_data *fan_data, unsigned long rpm)
|
|
{
|
|
struct gpio_fan_speed *speed = fan_data->speed;
|
|
int i;
|
|
|
|
for (i = 0; i < fan_data->num_speed; i++)
|
|
if (speed[i].rpm >= rpm)
|
|
return i;
|
|
|
|
return fan_data->num_speed - 1;
|
|
}
|
|
|
|
static ssize_t pwm1_show(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
|
|
u8 pwm = fan_data->speed_index * 255 / (fan_data->num_speed - 1);
|
|
|
|
return sprintf(buf, "%d\n", pwm);
|
|
}
|
|
|
|
static ssize_t pwm1_store(struct device *dev, struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
|
|
unsigned long pwm;
|
|
int speed_index;
|
|
int ret = count;
|
|
|
|
if (kstrtoul(buf, 10, &pwm) || pwm > 255)
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&fan_data->lock);
|
|
|
|
if (!fan_data->pwm_enable) {
|
|
ret = -EPERM;
|
|
goto exit_unlock;
|
|
}
|
|
|
|
speed_index = DIV_ROUND_UP(pwm * (fan_data->num_speed - 1), 255);
|
|
set_fan_speed(fan_data, speed_index);
|
|
|
|
exit_unlock:
|
|
mutex_unlock(&fan_data->lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t pwm1_enable_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
|
|
|
|
return sprintf(buf, "%d\n", fan_data->pwm_enable);
|
|
}
|
|
|
|
static ssize_t pwm1_enable_store(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
|
|
unsigned long val;
|
|
|
|
if (kstrtoul(buf, 10, &val) || val > 1)
|
|
return -EINVAL;
|
|
|
|
if (fan_data->pwm_enable == val)
|
|
return count;
|
|
|
|
mutex_lock(&fan_data->lock);
|
|
|
|
fan_data->pwm_enable = val;
|
|
|
|
/* Disable manual control mode: set fan at full speed. */
|
|
if (val == 0)
|
|
set_fan_speed(fan_data, fan_data->num_speed - 1);
|
|
|
|
mutex_unlock(&fan_data->lock);
|
|
|
|
return count;
|
|
}
|
|
|
|
static ssize_t pwm1_mode_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
return sprintf(buf, "0\n");
|
|
}
|
|
|
|
static ssize_t fan1_min_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
|
|
|
|
return sprintf(buf, "%d\n", fan_data->speed[0].rpm);
|
|
}
|
|
|
|
static ssize_t fan1_max_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
|
|
|
|
return sprintf(buf, "%d\n",
|
|
fan_data->speed[fan_data->num_speed - 1].rpm);
|
|
}
|
|
|
|
static ssize_t fan1_input_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
|
|
|
|
return sprintf(buf, "%d\n", fan_data->speed[fan_data->speed_index].rpm);
|
|
}
|
|
|
|
static ssize_t set_rpm(struct device *dev, struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
|
|
unsigned long rpm;
|
|
int ret = count;
|
|
|
|
if (kstrtoul(buf, 10, &rpm))
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&fan_data->lock);
|
|
|
|
if (!fan_data->pwm_enable) {
|
|
ret = -EPERM;
|
|
goto exit_unlock;
|
|
}
|
|
|
|
set_fan_speed(fan_data, rpm_to_speed_index(fan_data, rpm));
|
|
|
|
exit_unlock:
|
|
mutex_unlock(&fan_data->lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static DEVICE_ATTR_RW(pwm1);
|
|
static DEVICE_ATTR_RW(pwm1_enable);
|
|
static DEVICE_ATTR_RO(pwm1_mode);
|
|
static DEVICE_ATTR_RO(fan1_min);
|
|
static DEVICE_ATTR_RO(fan1_max);
|
|
static DEVICE_ATTR_RO(fan1_input);
|
|
static DEVICE_ATTR(fan1_target, S_IRUGO | S_IWUSR, fan1_input_show, set_rpm);
|
|
|
|
static umode_t gpio_fan_is_visible(struct kobject *kobj,
|
|
struct attribute *attr, int index)
|
|
{
|
|
struct device *dev = container_of(kobj, struct device, kobj);
|
|
struct gpio_fan_data *data = dev_get_drvdata(dev);
|
|
|
|
if (index == 0 && !data->alarm_gpio)
|
|
return 0;
|
|
if (index > 0 && !data->gpios)
|
|
return 0;
|
|
|
|
return attr->mode;
|
|
}
|
|
|
|
static struct attribute *gpio_fan_attributes[] = {
|
|
&dev_attr_fan1_alarm.attr, /* 0 */
|
|
&dev_attr_pwm1.attr, /* 1 */
|
|
&dev_attr_pwm1_enable.attr,
|
|
&dev_attr_pwm1_mode.attr,
|
|
&dev_attr_fan1_input.attr,
|
|
&dev_attr_fan1_target.attr,
|
|
&dev_attr_fan1_min.attr,
|
|
&dev_attr_fan1_max.attr,
|
|
NULL
|
|
};
|
|
|
|
static const struct attribute_group gpio_fan_group = {
|
|
.attrs = gpio_fan_attributes,
|
|
.is_visible = gpio_fan_is_visible,
|
|
};
|
|
|
|
static const struct attribute_group *gpio_fan_groups[] = {
|
|
&gpio_fan_group,
|
|
NULL
|
|
};
|
|
|
|
static int fan_ctrl_init(struct gpio_fan_data *fan_data)
|
|
{
|
|
int num_gpios = fan_data->num_gpios;
|
|
struct gpio_desc **gpios = fan_data->gpios;
|
|
int i, err;
|
|
|
|
for (i = 0; i < num_gpios; i++) {
|
|
/*
|
|
* The GPIO descriptors were retrieved with GPIOD_ASIS so here
|
|
* we set the GPIO into output mode, carefully preserving the
|
|
* current value by setting it to whatever it is already set
|
|
* (no surprise changes in default fan speed).
|
|
*/
|
|
err = gpiod_direction_output(gpios[i],
|
|
gpiod_get_value_cansleep(gpios[i]));
|
|
if (err)
|
|
return err;
|
|
}
|
|
|
|
fan_data->pwm_enable = true; /* Enable manual fan speed control. */
|
|
fan_data->speed_index = get_fan_speed_index(fan_data);
|
|
if (fan_data->speed_index < 0)
|
|
return fan_data->speed_index;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int gpio_fan_get_max_state(struct thermal_cooling_device *cdev,
|
|
unsigned long *state)
|
|
{
|
|
struct gpio_fan_data *fan_data = cdev->devdata;
|
|
|
|
if (!fan_data)
|
|
return -EINVAL;
|
|
|
|
*state = fan_data->num_speed - 1;
|
|
return 0;
|
|
}
|
|
|
|
static int gpio_fan_get_cur_state(struct thermal_cooling_device *cdev,
|
|
unsigned long *state)
|
|
{
|
|
struct gpio_fan_data *fan_data = cdev->devdata;
|
|
|
|
if (!fan_data)
|
|
return -EINVAL;
|
|
|
|
*state = fan_data->speed_index;
|
|
return 0;
|
|
}
|
|
|
|
static int gpio_fan_set_cur_state(struct thermal_cooling_device *cdev,
|
|
unsigned long state)
|
|
{
|
|
struct gpio_fan_data *fan_data = cdev->devdata;
|
|
|
|
if (!fan_data)
|
|
return -EINVAL;
|
|
|
|
set_fan_speed(fan_data, state);
|
|
return 0;
|
|
}
|
|
|
|
static const struct thermal_cooling_device_ops gpio_fan_cool_ops = {
|
|
.get_max_state = gpio_fan_get_max_state,
|
|
.get_cur_state = gpio_fan_get_cur_state,
|
|
.set_cur_state = gpio_fan_set_cur_state,
|
|
};
|
|
|
|
/*
|
|
* Translate OpenFirmware node properties into platform_data
|
|
*/
|
|
static int gpio_fan_get_of_data(struct gpio_fan_data *fan_data)
|
|
{
|
|
struct gpio_fan_speed *speed;
|
|
struct device *dev = fan_data->dev;
|
|
struct device_node *np = dev->of_node;
|
|
struct gpio_desc **gpios;
|
|
unsigned i;
|
|
u32 u;
|
|
struct property *prop;
|
|
const __be32 *p;
|
|
|
|
/* Alarm GPIO if one exists */
|
|
fan_data->alarm_gpio = devm_gpiod_get_optional(dev, "alarm", GPIOD_IN);
|
|
if (IS_ERR(fan_data->alarm_gpio))
|
|
return PTR_ERR(fan_data->alarm_gpio);
|
|
|
|
/* Fill GPIO pin array */
|
|
fan_data->num_gpios = gpiod_count(dev, NULL);
|
|
if (fan_data->num_gpios <= 0) {
|
|
if (fan_data->alarm_gpio)
|
|
return 0;
|
|
dev_err(dev, "DT properties empty / missing");
|
|
return -ENODEV;
|
|
}
|
|
gpios = devm_kcalloc(dev,
|
|
fan_data->num_gpios, sizeof(struct gpio_desc *),
|
|
GFP_KERNEL);
|
|
if (!gpios)
|
|
return -ENOMEM;
|
|
for (i = 0; i < fan_data->num_gpios; i++) {
|
|
gpios[i] = devm_gpiod_get_index(dev, NULL, i, GPIOD_ASIS);
|
|
if (IS_ERR(gpios[i]))
|
|
return PTR_ERR(gpios[i]);
|
|
}
|
|
fan_data->gpios = gpios;
|
|
|
|
/* Get number of RPM/ctrl_val pairs in speed map */
|
|
prop = of_find_property(np, "gpio-fan,speed-map", &i);
|
|
if (!prop) {
|
|
dev_err(dev, "gpio-fan,speed-map DT property missing");
|
|
return -ENODEV;
|
|
}
|
|
i = i / sizeof(u32);
|
|
if (i == 0 || i & 1) {
|
|
dev_err(dev, "gpio-fan,speed-map contains zero/odd number of entries");
|
|
return -ENODEV;
|
|
}
|
|
fan_data->num_speed = i / 2;
|
|
|
|
/*
|
|
* Populate speed map
|
|
* Speed map is in the form <RPM ctrl_val RPM ctrl_val ...>
|
|
* this needs splitting into pairs to create gpio_fan_speed structs
|
|
*/
|
|
speed = devm_kcalloc(dev,
|
|
fan_data->num_speed, sizeof(struct gpio_fan_speed),
|
|
GFP_KERNEL);
|
|
if (!speed)
|
|
return -ENOMEM;
|
|
p = NULL;
|
|
for (i = 0; i < fan_data->num_speed; i++) {
|
|
p = of_prop_next_u32(prop, p, &u);
|
|
if (!p)
|
|
return -ENODEV;
|
|
speed[i].rpm = u;
|
|
p = of_prop_next_u32(prop, p, &u);
|
|
if (!p)
|
|
return -ENODEV;
|
|
speed[i].ctrl_val = u;
|
|
}
|
|
fan_data->speed = speed;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id of_gpio_fan_match[] = {
|
|
{ .compatible = "gpio-fan", },
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(of, of_gpio_fan_match);
|
|
|
|
static int gpio_fan_probe(struct platform_device *pdev)
|
|
{
|
|
int err;
|
|
struct gpio_fan_data *fan_data;
|
|
struct device *dev = &pdev->dev;
|
|
struct device_node *np = dev->of_node;
|
|
|
|
fan_data = devm_kzalloc(dev, sizeof(struct gpio_fan_data),
|
|
GFP_KERNEL);
|
|
if (!fan_data)
|
|
return -ENOMEM;
|
|
|
|
fan_data->dev = dev;
|
|
err = gpio_fan_get_of_data(fan_data);
|
|
if (err)
|
|
return err;
|
|
|
|
platform_set_drvdata(pdev, fan_data);
|
|
mutex_init(&fan_data->lock);
|
|
|
|
/* Configure alarm GPIO if available. */
|
|
if (fan_data->alarm_gpio) {
|
|
err = fan_alarm_init(fan_data);
|
|
if (err)
|
|
return err;
|
|
}
|
|
|
|
/* Configure control GPIOs if available. */
|
|
if (fan_data->gpios && fan_data->num_gpios > 0) {
|
|
if (!fan_data->speed || fan_data->num_speed <= 1)
|
|
return -EINVAL;
|
|
err = fan_ctrl_init(fan_data);
|
|
if (err)
|
|
return err;
|
|
}
|
|
|
|
/* Make this driver part of hwmon class. */
|
|
fan_data->hwmon_dev =
|
|
devm_hwmon_device_register_with_groups(dev,
|
|
"gpio_fan", fan_data,
|
|
gpio_fan_groups);
|
|
if (IS_ERR(fan_data->hwmon_dev))
|
|
return PTR_ERR(fan_data->hwmon_dev);
|
|
|
|
/* Optional cooling device register for Device tree platforms */
|
|
fan_data->cdev = thermal_of_cooling_device_register(np,
|
|
"gpio-fan",
|
|
fan_data,
|
|
&gpio_fan_cool_ops);
|
|
|
|
dev_info(dev, "GPIO fan initialized\n");
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int gpio_fan_remove(struct platform_device *pdev)
|
|
{
|
|
struct gpio_fan_data *fan_data = platform_get_drvdata(pdev);
|
|
|
|
if (!IS_ERR(fan_data->cdev))
|
|
thermal_cooling_device_unregister(fan_data->cdev);
|
|
|
|
if (fan_data->gpios)
|
|
set_fan_speed(fan_data, 0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void gpio_fan_shutdown(struct platform_device *pdev)
|
|
{
|
|
gpio_fan_remove(pdev);
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static int gpio_fan_suspend(struct device *dev)
|
|
{
|
|
struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
|
|
|
|
if (fan_data->gpios) {
|
|
fan_data->resume_speed = fan_data->speed_index;
|
|
set_fan_speed(fan_data, 0);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int gpio_fan_resume(struct device *dev)
|
|
{
|
|
struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
|
|
|
|
if (fan_data->gpios)
|
|
set_fan_speed(fan_data, fan_data->resume_speed);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static SIMPLE_DEV_PM_OPS(gpio_fan_pm, gpio_fan_suspend, gpio_fan_resume);
|
|
#define GPIO_FAN_PM (&gpio_fan_pm)
|
|
#else
|
|
#define GPIO_FAN_PM NULL
|
|
#endif
|
|
|
|
static struct platform_driver gpio_fan_driver = {
|
|
.probe = gpio_fan_probe,
|
|
.remove = gpio_fan_remove,
|
|
.shutdown = gpio_fan_shutdown,
|
|
.driver = {
|
|
.name = "gpio-fan",
|
|
.pm = GPIO_FAN_PM,
|
|
.of_match_table = of_match_ptr(of_gpio_fan_match),
|
|
},
|
|
};
|
|
|
|
module_platform_driver(gpio_fan_driver);
|
|
|
|
MODULE_AUTHOR("Simon Guinot <sguinot@lacie.com>");
|
|
MODULE_DESCRIPTION("GPIO FAN driver");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("platform:gpio-fan");
|