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authorLukasz Majewski <l.majewski@samsung.com>2015-02-26 14:59:36 +0100
committerGuenter Roeck <linux@roeck-us.net>2015-03-09 09:59:36 -0700
commit2e5219c77183be47eb9ae4b1a4195e008d196c73 (patch)
treee4401ed00f312bb3a6ee8ce188c89b1b46b5bfd5 /drivers/hwmon
parentcb85ca332f4d72ca68464c55f63af0387f6bbdb1 (diff)
hwmon: (pwm-fan) Read PWM FAN configuration from device tree
This patch provides code for reading PWM FAN configuration data via device tree. The pwm-fan can work with full speed when configuration is not provided. However, errors are propagated when wrong DT bindings are found. Additionally the struct pwm_fan_ctx has been extended. Signed-off-by: Lukasz Majewski <l.majewski@samsung.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Diffstat (limited to 'drivers/hwmon')
-rw-r--r--drivers/hwmon/pwm-fan.c50
1 files changed, 49 insertions, 1 deletions
diff --git a/drivers/hwmon/pwm-fan.c b/drivers/hwmon/pwm-fan.c
index bd42d3996a86..e6ed3532deac 100644
--- a/drivers/hwmon/pwm-fan.c
+++ b/drivers/hwmon/pwm-fan.c
@@ -30,7 +30,10 @@
struct pwm_fan_ctx {
struct mutex lock;
struct pwm_device *pwm;
- unsigned char pwm_value;
+ unsigned int pwm_value;
+ unsigned int pwm_fan_state;
+ unsigned int pwm_fan_max_state;
+ unsigned int *pwm_fan_cooling_levels;
};
static int __set_pwm(struct pwm_fan_ctx *ctx, unsigned long pwm)
@@ -100,6 +103,46 @@ static struct attribute *pwm_fan_attrs[] = {
ATTRIBUTE_GROUPS(pwm_fan);
+int pwm_fan_of_get_cooling_data(struct device *dev, struct pwm_fan_ctx *ctx)
+{
+ struct device_node *np = dev->of_node;
+ int num, i, ret;
+
+ if (!of_find_property(np, "cooling-levels", NULL))
+ return 0;
+
+ ret = of_property_count_u32_elems(np, "cooling-levels");
+ if (ret <= 0) {
+ dev_err(dev, "Wrong data!\n");
+ return ret ? : -EINVAL;
+ }
+
+ num = ret;
+ ctx->pwm_fan_cooling_levels = devm_kzalloc(dev, num * sizeof(u32),
+ GFP_KERNEL);
+ if (!ctx->pwm_fan_cooling_levels)
+ return -ENOMEM;
+
+ ret = of_property_read_u32_array(np, "cooling-levels",
+ ctx->pwm_fan_cooling_levels, num);
+ if (ret) {
+ dev_err(dev, "Property 'cooling-levels' cannot be read!\n");
+ return ret;
+ }
+
+ for (i = 0; i < num; i++) {
+ if (ctx->pwm_fan_cooling_levels[i] > MAX_PWM) {
+ dev_err(dev, "PWM fan state[%d]:%d > %d\n", i,
+ ctx->pwm_fan_cooling_levels[i], MAX_PWM);
+ return -EINVAL;
+ }
+ }
+
+ ctx->pwm_fan_max_state = num - 1;
+
+ return 0;
+}
+
static int pwm_fan_probe(struct platform_device *pdev)
{
struct device *hwmon;
@@ -145,6 +188,11 @@ static int pwm_fan_probe(struct platform_device *pdev)
pwm_disable(ctx->pwm);
return PTR_ERR(hwmon);
}
+
+ ret = pwm_fan_of_get_cooling_data(&pdev->dev, ctx);
+ if (ret)
+ return ret;
+
return 0;
}