linux-kernel - [PATCH] staging: greybus: introduce pwm

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Date:   Thu, 10 Feb 2022 17:05:02 +0800
From:   Song Chen <chensong_2000@....cn>
To:     johan@...nel.org, elder@...nel.org, gregkh@...uxfoundation.org,
        thierry.reding@...il.com, u.kleine-koenig@...gutronix.de,
        lee.jones@...aro.org, greybus-dev@...ts.linaro.org,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org,
        linux-pwm@...r.kernel.org
Cc:     Song Chen <chensong_2000@....cn>
Subject: [PATCH] staging: greybus: introduce pwm_ops::apply

Introduce apply in pwm_ops to replace legacy operations,
like enable, disable, config and set_polarity.

Signed-off-by: Song Chen <chensong_2000@....cn>
---
 drivers/staging/greybus/pwm.c | 46 +++++++++++++++--------------------
 1 file changed, 19 insertions(+), 27 deletions(-)

diff --git a/drivers/staging/greybus/pwm.c b/drivers/staging/greybus/pwm.c
index 891a6a672378..e1889cf979b2 100644
--- a/drivers/staging/greybus/pwm.c
+++ b/drivers/staging/greybus/pwm.c
@@ -204,43 +204,35 @@ static void gb_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
 	gb_pwm_deactivate_operation(pwmc, pwm->hwpwm);
 }
 
-static int gb_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
-			 int duty_ns, int period_ns)
-{
-	struct gb_pwm_chip *pwmc = pwm_chip_to_gb_pwm_chip(chip);
-
-	return gb_pwm_config_operation(pwmc, pwm->hwpwm, duty_ns, period_ns);
-};
-
-static int gb_pwm_set_polarity(struct pwm_chip *chip, struct pwm_device *pwm,
-			       enum pwm_polarity polarity)
+static int gb_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
+			const struct pwm_state *state)
 {
+	int ret;
 	struct gb_pwm_chip *pwmc = pwm_chip_to_gb_pwm_chip(chip);
 
-	return gb_pwm_set_polarity_operation(pwmc, pwm->hwpwm, polarity);
-};
-
-static int gb_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
-{
-	struct gb_pwm_chip *pwmc = pwm_chip_to_gb_pwm_chip(chip);
+	/* set period and duty cycle*/
+	ret = gb_pwm_config_operation(pwmc, pwm->hwpwm, state->duty_cycle, state->period);
+	if (ret)
+		return ret;
 
-	return gb_pwm_enable_operation(pwmc, pwm->hwpwm);
-};
+	/* set polarity */
+	ret = gb_pwm_set_polarity_operation(pwmc, pwm->hwpwm, state->polarity);
+	if (ret)
+		return ret;
 
-static void gb_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
-{
-	struct gb_pwm_chip *pwmc = pwm_chip_to_gb_pwm_chip(chip);
+	/* enable/disable */
+	if (state->enabled)
+		ret = gb_pwm_enable_operation(pwmc, pwm->hwpwm);
+	else
+		ret = gb_pwm_disable_operation(pwmc, pwm->hwpwm);
 
-	gb_pwm_disable_operation(pwmc, pwm->hwpwm);
-};
+	return ret;
+}
 
 static const struct pwm_ops gb_pwm_ops = {
 	.request = gb_pwm_request,
 	.free = gb_pwm_free,
-	.config = gb_pwm_config,
-	.set_polarity = gb_pwm_set_polarity,
-	.enable = gb_pwm_enable,
-	.disable = gb_pwm_disable,
+	.apply = gb_pwm_apply,
 	.owner = THIS_MODULE,
 };
 
-- 
2.25.1