diff mbox series

[v3,11/15] pwm: crc: Implement get_state() method

Message ID 20200620121758.14836-12-hdegoede@redhat.com
State New
Headers show
Series acpi/pwm/i915: Convert pwm-crc and i915 driver's PWM code to use the atomic PWM API | expand

Commit Message

Hans de Goede June 20, 2020, 12:17 p.m. UTC
Implement the pwm_ops.get_state() method to complete the support for the
new atomic PWM API.

Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
Changes in v3:
- Add Andy's Reviewed-by tag
- Remove extra whitespace to align some code after assignments (requested by
  Uwe Kleine-König)
---
 drivers/pwm/pwm-crc.c | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

Comments

Uwe Kleine-König June 22, 2020, 7:57 a.m. UTC | #1
On Sat, Jun 20, 2020 at 02:17:54PM +0200, Hans de Goede wrote:
> Implement the pwm_ops.get_state() method to complete the support for the
> new atomic PWM API.
> 
> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> Signed-off-by: Hans de Goede <hdegoede@redhat.com>
> ---
> Changes in v3:
> - Add Andy's Reviewed-by tag
> - Remove extra whitespace to align some code after assignments (requested by
>   Uwe Kleine-König)
> ---
>  drivers/pwm/pwm-crc.c | 29 +++++++++++++++++++++++++++++
>  1 file changed, 29 insertions(+)
> 
> diff --git a/drivers/pwm/pwm-crc.c b/drivers/pwm/pwm-crc.c
> index 8a7f4707279c..b311354d40a3 100644
> --- a/drivers/pwm/pwm-crc.c
> +++ b/drivers/pwm/pwm-crc.c
> @@ -119,8 +119,37 @@ static int crc_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
>  	return 0;
>  }
>  
> +static void crc_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm,
> +			       struct pwm_state *state)
> +{
> +	struct crystalcove_pwm *crc_pwm = to_crc_pwm(chip);
> +	struct device *dev = crc_pwm->chip.dev;
> +	unsigned int clk_div, clk_div_reg, duty_cycle_reg;
> +	int error;
> +
> +	error = regmap_read(crc_pwm->regmap, PWM0_CLK_DIV, &clk_div_reg);
> +	if (error) {
> +		dev_err(dev, "Error reading PWM0_CLK_DIV %d\n", error);
> +		return;
> +	}
> +
> +	error = regmap_read(crc_pwm->regmap, PWM0_DUTY_CYCLE, &duty_cycle_reg);
> +	if (error) {
> +		dev_err(dev, "Error reading PWM0_DUTY_CYCLE %d\n", error);
> +		return;
> +	}
> +
> +	clk_div = (clk_div_reg & ~PWM_OUTPUT_ENABLE) + 1;
> +
> +	state->period = clk_div * NSEC_PER_USEC * 256 / PWM_BASE_CLK_MHZ;
> +	state->duty_cycle = duty_cycle_reg * state->period / PWM_MAX_LEVEL;

Please round up here.

> +	state->polarity = PWM_POLARITY_NORMAL;
> +	state->enabled = !!(clk_div_reg & PWM_OUTPUT_ENABLE);
> +}
> +

Best regards
Uwe
diff mbox series

Patch

diff --git a/drivers/pwm/pwm-crc.c b/drivers/pwm/pwm-crc.c
index 8a7f4707279c..b311354d40a3 100644
--- a/drivers/pwm/pwm-crc.c
+++ b/drivers/pwm/pwm-crc.c
@@ -119,8 +119,37 @@  static int crc_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 	return 0;
 }
 
+static void crc_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm,
+			       struct pwm_state *state)
+{
+	struct crystalcove_pwm *crc_pwm = to_crc_pwm(chip);
+	struct device *dev = crc_pwm->chip.dev;
+	unsigned int clk_div, clk_div_reg, duty_cycle_reg;
+	int error;
+
+	error = regmap_read(crc_pwm->regmap, PWM0_CLK_DIV, &clk_div_reg);
+	if (error) {
+		dev_err(dev, "Error reading PWM0_CLK_DIV %d\n", error);
+		return;
+	}
+
+	error = regmap_read(crc_pwm->regmap, PWM0_DUTY_CYCLE, &duty_cycle_reg);
+	if (error) {
+		dev_err(dev, "Error reading PWM0_DUTY_CYCLE %d\n", error);
+		return;
+	}
+
+	clk_div = (clk_div_reg & ~PWM_OUTPUT_ENABLE) + 1;
+
+	state->period = clk_div * NSEC_PER_USEC * 256 / PWM_BASE_CLK_MHZ;
+	state->duty_cycle = duty_cycle_reg * state->period / PWM_MAX_LEVEL;
+	state->polarity = PWM_POLARITY_NORMAL;
+	state->enabled = !!(clk_div_reg & PWM_OUTPUT_ENABLE);
+}
+
 static const struct pwm_ops crc_pwm_ops = {
 	.apply = crc_pwm_apply,
+	.get_state = crc_pwm_get_state,
 };
 
 static int crystalcove_pwm_probe(struct platform_device *pdev)