Merge tag 'iio-fixes-for-4.14a' of git://git.kernel.org/pub/scm/linux/kernel/git...
[muen/linux.git] / drivers / iio / trigger / stm32-timer-trigger.c
index a30ba6e1dfec5f0a262345ccbdceabc2768eb378..eb212f8c88793b2c1029f087b40733039b5d9f96 100644 (file)
@@ -403,34 +403,32 @@ static int stm32_counter_read_raw(struct iio_dev *indio_dev,
                                  int *val, int *val2, long mask)
 {
        struct stm32_timer_trigger *priv = iio_priv(indio_dev);
+       u32 dat;
 
        switch (mask) {
        case IIO_CHAN_INFO_RAW:
-       {
-               u32 cnt;
-
-               regmap_read(priv->regmap, TIM_CNT, &cnt);
-               *val = cnt;
+               regmap_read(priv->regmap, TIM_CNT, &dat);
+               *val = dat;
+               return IIO_VAL_INT;
 
+       case IIO_CHAN_INFO_ENABLE:
+               regmap_read(priv->regmap, TIM_CR1, &dat);
+               *val = (dat & TIM_CR1_CEN) ? 1 : 0;
                return IIO_VAL_INT;
-       }
-       case IIO_CHAN_INFO_SCALE:
-       {
-               u32 smcr;
 
-               regmap_read(priv->regmap, TIM_SMCR, &smcr);
-               smcr &= TIM_SMCR_SMS;
+       case IIO_CHAN_INFO_SCALE:
+               regmap_read(priv->regmap, TIM_SMCR, &dat);
+               dat &= TIM_SMCR_SMS;
 
                *val = 1;
                *val2 = 0;
 
                /* in quadrature case scale = 0.25 */
-               if (smcr == 3)
+               if (dat == 3)
                        *val2 = 2;
 
                return IIO_VAL_FRACTIONAL_LOG2;
        }
-       }
 
        return -EINVAL;
 }
@@ -440,15 +438,31 @@ static int stm32_counter_write_raw(struct iio_dev *indio_dev,
                                   int val, int val2, long mask)
 {
        struct stm32_timer_trigger *priv = iio_priv(indio_dev);
+       u32 dat;
 
        switch (mask) {
        case IIO_CHAN_INFO_RAW:
-               regmap_write(priv->regmap, TIM_CNT, val);
+               return regmap_write(priv->regmap, TIM_CNT, val);
 
-               return IIO_VAL_INT;
        case IIO_CHAN_INFO_SCALE:
                /* fixed scale */
                return -EINVAL;
+
+       case IIO_CHAN_INFO_ENABLE:
+               if (val) {
+                       regmap_read(priv->regmap, TIM_CR1, &dat);
+                       if (!(dat & TIM_CR1_CEN))
+                               clk_enable(priv->clk);
+                       regmap_update_bits(priv->regmap, TIM_CR1, TIM_CR1_CEN,
+                                          TIM_CR1_CEN);
+               } else {
+                       regmap_read(priv->regmap, TIM_CR1, &dat);
+                       regmap_update_bits(priv->regmap, TIM_CR1, TIM_CR1_CEN,
+                                          0);
+                       if (dat & TIM_CR1_CEN)
+                               clk_disable(priv->clk);
+               }
+               return 0;
        }
 
        return -EINVAL;
@@ -508,7 +522,7 @@ static int stm32_get_trigger_mode(struct iio_dev *indio_dev,
 
        regmap_read(priv->regmap, TIM_SMCR, &smcr);
 
-       return smcr == TIM_SMCR_SMS ? 0 : -EINVAL;
+       return (smcr & TIM_SMCR_SMS) == TIM_SMCR_SMS ? 0 : -EINVAL;
 }
 
 static const struct iio_enum stm32_trigger_mode_enum = {
@@ -544,9 +558,19 @@ static int stm32_set_enable_mode(struct iio_dev *indio_dev,
 {
        struct stm32_timer_trigger *priv = iio_priv(indio_dev);
        int sms = stm32_enable_mode2sms(mode);
+       u32 val;
 
        if (sms < 0)
                return sms;
+       /*
+        * Triggered mode sets CEN bit automatically by hardware. So, first
+        * enable counter clock, so it can use it. Keeps it in sync with CEN.
+        */
+       if (sms == 6) {
+               regmap_read(priv->regmap, TIM_CR1, &val);
+               if (!(val & TIM_CR1_CEN))
+                       clk_enable(priv->clk);
+       }
 
        regmap_update_bits(priv->regmap, TIM_SMCR, TIM_SMCR_SMS, sms);
 
@@ -608,11 +632,14 @@ static int stm32_get_quadrature_mode(struct iio_dev *indio_dev,
 {
        struct stm32_timer_trigger *priv = iio_priv(indio_dev);
        u32 smcr;
+       int mode;
 
        regmap_read(priv->regmap, TIM_SMCR, &smcr);
-       smcr &= TIM_SMCR_SMS;
+       mode = (smcr & TIM_SMCR_SMS) - 1;
+       if ((mode < 0) || (mode > ARRAY_SIZE(stm32_quadrature_modes)))
+               return -EINVAL;
 
-       return smcr - 1;
+       return mode;
 }
 
 static const struct iio_enum stm32_quadrature_mode_enum = {
@@ -629,13 +656,20 @@ static const char *const stm32_count_direction_states[] = {
 
 static int stm32_set_count_direction(struct iio_dev *indio_dev,
                                     const struct iio_chan_spec *chan,
-                                    unsigned int mode)
+                                    unsigned int dir)
 {
        struct stm32_timer_trigger *priv = iio_priv(indio_dev);
+       u32 val;
+       int mode;
 
-       regmap_update_bits(priv->regmap, TIM_CR1, TIM_CR1_DIR, mode);
+       /* In encoder mode, direction is RO (given by TI1/TI2 signals) */
+       regmap_read(priv->regmap, TIM_SMCR, &val);
+       mode = (val & TIM_SMCR_SMS) - 1;
+       if ((mode >= 0) || (mode < ARRAY_SIZE(stm32_quadrature_modes)))
+               return -EBUSY;
 
-       return 0;
+       return regmap_update_bits(priv->regmap, TIM_CR1, TIM_CR1_DIR,
+                                 dir ? TIM_CR1_DIR : 0);
 }
 
 static int stm32_get_count_direction(struct iio_dev *indio_dev,
@@ -646,7 +680,7 @@ static int stm32_get_count_direction(struct iio_dev *indio_dev,
 
        regmap_read(priv->regmap, TIM_CR1, &cr1);
 
-       return (cr1 & TIM_CR1_DIR);
+       return ((cr1 & TIM_CR1_DIR) ? 1 : 0);
 }
 
 static const struct iio_enum stm32_count_direction_enum = {
@@ -710,7 +744,9 @@ static const struct iio_chan_spec_ext_info stm32_trigger_count_info[] = {
 static const struct iio_chan_spec stm32_trigger_channel = {
        .type = IIO_COUNT,
        .channel = 0,
-       .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
+       .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+                             BIT(IIO_CHAN_INFO_ENABLE) |
+                             BIT(IIO_CHAN_INFO_SCALE),
        .ext_info = stm32_trigger_count_info,
        .indexed = 1
 };