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>
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@ -30,7 +30,10 @@
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struct pwm_fan_ctx {
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struct mutex lock;
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struct pwm_device *pwm;
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unsigned char pwm_value;
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unsigned int pwm_value;
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unsigned int pwm_fan_state;
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unsigned int pwm_fan_max_state;
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unsigned int *pwm_fan_cooling_levels;
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};
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static int __set_pwm(struct pwm_fan_ctx *ctx, unsigned long pwm)
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@ -100,6 +103,46 @@ static struct attribute *pwm_fan_attrs[] = {
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ATTRIBUTE_GROUPS(pwm_fan);
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int pwm_fan_of_get_cooling_data(struct device *dev, struct pwm_fan_ctx *ctx)
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{
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struct device_node *np = dev->of_node;
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int num, i, ret;
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if (!of_find_property(np, "cooling-levels", NULL))
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return 0;
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ret = of_property_count_u32_elems(np, "cooling-levels");
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if (ret <= 0) {
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dev_err(dev, "Wrong data!\n");
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return ret ? : -EINVAL;
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}
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num = ret;
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ctx->pwm_fan_cooling_levels = devm_kzalloc(dev, num * sizeof(u32),
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GFP_KERNEL);
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if (!ctx->pwm_fan_cooling_levels)
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return -ENOMEM;
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ret = of_property_read_u32_array(np, "cooling-levels",
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ctx->pwm_fan_cooling_levels, num);
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if (ret) {
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dev_err(dev, "Property 'cooling-levels' cannot be read!\n");
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return ret;
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}
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for (i = 0; i < num; i++) {
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if (ctx->pwm_fan_cooling_levels[i] > MAX_PWM) {
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dev_err(dev, "PWM fan state[%d]:%d > %d\n", i,
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ctx->pwm_fan_cooling_levels[i], MAX_PWM);
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return -EINVAL;
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}
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}
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ctx->pwm_fan_max_state = num - 1;
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return 0;
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}
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static int pwm_fan_probe(struct platform_device *pdev)
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{
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struct device *hwmon;
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@ -145,6 +188,11 @@ static int pwm_fan_probe(struct platform_device *pdev)
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pwm_disable(ctx->pwm);
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return PTR_ERR(hwmon);
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}
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ret = pwm_fan_of_get_cooling_data(&pdev->dev, ctx);
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if (ret)
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return ret;
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return 0;
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}
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