linux-kernel - [PATCH v2] staging: greybus: introduce pwm

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Message-Id: <1644580947-8529-1-git-send-email-chensong_2000@189.cn>
Date:   Fri, 11 Feb 2022 20:02:27 +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 v2] 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>

---
V2:
1, define duty_cycle and period as u64 in gb_pwm_config_operation.
2, define duty and period as u64 in gb_pwm_config_request.
3, disable before configuring duty and period if the eventual goal
   is a disabled state.
---
 drivers/staging/greybus/pwm.c             | 61 ++++++++++++-----------
 include/linux/greybus/greybus_protocols.h |  4 +-
 2 files changed, 34 insertions(+), 31 deletions(-)

diff --git a/drivers/staging/greybus/pwm.c b/drivers/staging/greybus/pwm.c
index 891a6a672378..03c69db5b9be 100644
--- a/drivers/staging/greybus/pwm.c
+++ b/drivers/staging/greybus/pwm.c
@@ -89,7 +89,7 @@ static int gb_pwm_deactivate_operation(struct gb_pwm_chip *pwmc,
 }
 
 static int gb_pwm_config_operation(struct gb_pwm_chip *pwmc,
-				   u8 which, u32 duty, u32 period)
+				   u8 which, u64 duty, u64 period)
 {
 	struct gb_pwm_config_request request;
 	struct gbphy_device *gbphy_dev;
@@ -99,8 +99,8 @@ static int gb_pwm_config_operation(struct gb_pwm_chip *pwmc,
 		return -EINVAL;
 
 	request.which = which;
-	request.duty = cpu_to_le32(duty);
-	request.period = cpu_to_le32(period);
+	request.duty = duty;
+	request.period = period;
 
 	gbphy_dev = to_gbphy_dev(pwmc->chip.dev);
 	ret = gbphy_runtime_get_sync(gbphy_dev);
@@ -204,43 +204,46 @@ 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)
+static int gb_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
+			const struct pwm_state *state)
 {
+	int err;
+	bool enabled = pwm->state.enabled;
 	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)
-{
-	struct gb_pwm_chip *pwmc = pwm_chip_to_gb_pwm_chip(chip);
-
-	return gb_pwm_set_polarity_operation(pwmc, pwm->hwpwm, polarity);
-};
+	/* set polarity */
+	if (state->polarity != pwm->state.polarity) {
+		if (enabled) {
+			gb_pwm_disable_operation(pwmc, pwm->hwpwm);
+			enabled = false;
+		}
+		err = gb_pwm_set_polarity_operation(pwmc, pwm->hwpwm, state->polarity);
+		if (err)
+			return err;
+	}
 
-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);
+	if (!state->enabled) {
+		if (enabled)
+			gb_pwm_disable_operation(pwmc, pwm->hwpwm);
+		return 0;
+	}
 
-	return gb_pwm_enable_operation(pwmc, pwm->hwpwm);
-};
+	/* set period and duty cycle*/
+	err = gb_pwm_config_operation(pwmc, pwm->hwpwm, state->duty_cycle, state->period);
+	if (err)
+		return err;
 
-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 (!enabled)
+		return gb_pwm_enable_operation(pwmc, pwm->hwpwm);
 
-	gb_pwm_disable_operation(pwmc, pwm->hwpwm);
-};
+	return 0;
+}
 
 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,
 };
 
diff --git a/include/linux/greybus/greybus_protocols.h b/include/linux/greybus/greybus_protocols.h
index aeb8f9243545..81a6f16de098 100644
--- a/include/linux/greybus/greybus_protocols.h
+++ b/include/linux/greybus/greybus_protocols.h
@@ -812,8 +812,8 @@ struct gb_pwm_deactivate_request {
 
 struct gb_pwm_config_request {
 	__u8	which;
-	__le32	duty;
-	__le32	period;
+	__u64	duty;
+	__u64	period;
 } __packed;
 
 struct gb_pwm_polarity_request {
-- 
2.25.1