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    Subject[PATCH 6/9] hwmon: thermal: Read PWM FAN configuration from device tree
    Date
    Code for reading PWM FAN configuration data via device tree has been added.

    Signed-off-by: Lukasz Majewski <l.majewski@samsung.com>
    ---
    drivers/hwmon/pwm-fan.c | 51 ++++++++++++++++++++++++++++++++++++++++++++++++-
    1 file changed, 50 insertions(+), 1 deletion(-)

    diff --git a/drivers/hwmon/pwm-fan.c b/drivers/hwmon/pwm-fan.c
    index 870e100..5854bb3 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_states;
    };

    static int __set_pwm(struct pwm_fan_ctx *ctx, unsigned long pwm)
    @@ -100,6 +103,49 @@ 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;
    + struct property *pp;
    + int len, num, i;
    +
    + pp = of_find_property(np, "cooling-pwm-values", &len);
    + if (!pp) {
    + dev_err(dev, "Property: 'cooling-pwm-values' not found\n");
    + return -EINVAL;
    + }
    +
    + if (len == 0) {
    + dev_err(dev, "Length wrong value!\n");
    + return -EINVAL;
    + }
    +
    + ctx->pwm_fan_cooling_states = devm_kzalloc(dev, len, GFP_KERNEL);
    + if (!ctx->pwm_fan_cooling_states) {
    + dev_err(dev, "Allocation failed for pwm dan cooling states\n");
    + return -ENOMEM;
    + }
    +
    + num = len / sizeof(u32);
    + if (of_property_read_u32_array(np, pp->name,
    + ctx->pwm_fan_cooling_states, num)) {
    + dev_err(dev, "Property: %s cannot be read!\n", pp->name);
    + return -EINVAL;
    + }
    +
    + for (i = 0; i < num; i++) {
    + if (ctx->pwm_fan_cooling_states[i] > MAX_PWM) {
    + dev_err(dev, "PWM fan state[%d]:%d > %d\n", i,
    + ctx->pwm_fan_cooling_states[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;
    @@ -120,6 +166,9 @@ static int pwm_fan_probe(struct platform_device *pdev)
    }

    platform_set_drvdata(pdev, ctx);
    + ret = pwm_fan_of_get_cooling_data(&pdev->dev, ctx);
    + if (ret)
    + return ret;

    /* Set duty cycle to maximum allowed */
    duty_cycle = ctx->pwm->period - 1;
    --
    2.0.0.rc2


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