From 39100ceea79ff2efeb2fb094baf120c73d5ccf47 Mon Sep 17 00:00:00 2001
From: Boris Brezillon <boris.brezillon@free-electrons.com>
Date: Thu, 14 Apr 2016 21:17:43 +0200
Subject: [PATCH] pwm: Switch to the atomic API

Replace legacy pwm_get/set_xxx() and pwm_config/enable/disable() calls
by pwm_get/apply_state().

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
---
 drivers/pwm/core.c  |  5 ++++-
 drivers/pwm/sysfs.c | 48 ++++++++++++++++++++++++++++++++++-----------
 2 files changed, 41 insertions(+), 12 deletions(-)

diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c
index 729d457861fd..b0b87b3b52a6 100644
--- a/drivers/pwm/core.c
+++ b/drivers/pwm/core.c
@@ -948,13 +948,16 @@ static void pwm_dbg_show(struct pwm_chip *chip, struct seq_file *s)
 
 	for (i = 0; i < chip->npwm; i++) {
 		struct pwm_device *pwm = &chip->pwms[i];
+		struct pwm_state state;
+
+		pwm_get_state(pwm, &state);
 
 		seq_printf(s, " pwm-%-3d (%-20.20s):", i, pwm->label);
 
 		if (test_bit(PWMF_REQUESTED, &pwm->flags))
 			seq_puts(s, " requested");
 
-		if (pwm_is_enabled(pwm))
+		if (state.enabled)
 			seq_puts(s, " enabled");
 
 		seq_puts(s, "\n");
diff --git a/drivers/pwm/sysfs.c b/drivers/pwm/sysfs.c
index 187ca0875cf6..d98599249a05 100644
--- a/drivers/pwm/sysfs.c
+++ b/drivers/pwm/sysfs.c
@@ -46,8 +46,11 @@ static ssize_t period_show(struct device *child,
 			   char *buf)
 {
 	const struct pwm_device *pwm = child_to_pwm_device(child);
+	struct pwm_state state;
 
-	return sprintf(buf, "%u\n", pwm_get_period(pwm));
+	pwm_get_state(pwm, &state);
+
+	return sprintf(buf, "%u\n", state.period);
 }
 
 static ssize_t period_store(struct device *child,
@@ -56,6 +59,7 @@ static ssize_t period_store(struct device *child,
 {
 	struct pwm_export *export = child_to_pwm_export(child);
 	struct pwm_device *pwm = export->pwm;
+	struct pwm_state state;
 	unsigned int val;
 	int ret;
 
@@ -64,7 +68,9 @@ static ssize_t period_store(struct device *child,
 		return ret;
 
 	mutex_lock(&export->lock);
-	ret = pwm_config(pwm, pwm_get_duty_cycle(pwm), val);
+	pwm_get_state(pwm, &state);
+	state.period = val;
+	ret = pwm_apply_state(pwm, &state);
 	mutex_unlock(&export->lock);
 
 	return ret ? : size;
@@ -75,8 +81,11 @@ static ssize_t duty_cycle_show(struct device *child,
 			       char *buf)
 {
 	const struct pwm_device *pwm = child_to_pwm_device(child);
+	struct pwm_state state;
+
+	pwm_get_state(pwm, &state);
 
-	return sprintf(buf, "%u\n", pwm_get_duty_cycle(pwm));
+	return sprintf(buf, "%u\n", state.duty_cycle);
 }
 
 static ssize_t duty_cycle_store(struct device *child,
@@ -85,6 +94,7 @@ static ssize_t duty_cycle_store(struct device *child,
 {
 	struct pwm_export *export = child_to_pwm_export(child);
 	struct pwm_device *pwm = export->pwm;
+	struct pwm_state state;
 	unsigned int val;
 	int ret;
 
@@ -93,7 +103,9 @@ static ssize_t duty_cycle_store(struct device *child,
 		return ret;
 
 	mutex_lock(&export->lock);
-	ret = pwm_config(pwm, val, pwm_get_period(pwm));
+	pwm_get_state(pwm, &state);
+	state.duty_cycle = val;
+	ret = pwm_apply_state(pwm, &state);
 	mutex_unlock(&export->lock);
 
 	return ret ? : size;
@@ -104,8 +116,11 @@ static ssize_t enable_show(struct device *child,
 			   char *buf)
 {
 	const struct pwm_device *pwm = child_to_pwm_device(child);
+	struct pwm_state state;
 
-	return sprintf(buf, "%d\n", pwm_is_enabled(pwm));
+	pwm_get_state(pwm, &state);
+
+	return sprintf(buf, "%d\n", state.enabled);
 }
 
 static ssize_t enable_store(struct device *child,
@@ -114,6 +129,7 @@ static ssize_t enable_store(struct device *child,
 {
 	struct pwm_export *export = child_to_pwm_export(child);
 	struct pwm_device *pwm = export->pwm;
+	struct pwm_state state;
 	int val, ret;
 
 	ret = kstrtoint(buf, 0, &val);
@@ -122,20 +138,24 @@ static ssize_t enable_store(struct device *child,
 
 	mutex_lock(&export->lock);
 
+	pwm_get_state(pwm, &state);
+
 	switch (val) {
 	case 0:
-		pwm_disable(pwm);
+		state.enabled = false;
 		break;
 	case 1:
-		ret = pwm_enable(pwm);
+		state.enabled = true;
 		break;
 	default:
 		ret = -EINVAL;
-		break;
+		goto unlock;
 	}
 
-	mutex_unlock(&export->lock);
+	pwm_apply_state(pwm, &state);
 
+unlock:
+	mutex_unlock(&export->lock);
 	return ret ? : size;
 }
 
@@ -145,8 +165,11 @@ static ssize_t polarity_show(struct device *child,
 {
 	const struct pwm_device *pwm = child_to_pwm_device(child);
 	const char *polarity = "unknown";
+	struct pwm_state state;
+
+	pwm_get_state(pwm, &state);
 
-	switch (pwm_get_polarity(pwm)) {
+	switch (state.polarity) {
 	case PWM_POLARITY_NORMAL:
 		polarity = "normal";
 		break;
@@ -166,6 +189,7 @@ static ssize_t polarity_store(struct device *child,
 	struct pwm_export *export = child_to_pwm_export(child);
 	struct pwm_device *pwm = export->pwm;
 	enum pwm_polarity polarity;
+	struct pwm_state state;
 	int ret;
 
 	if (sysfs_streq(buf, "normal"))
@@ -176,7 +200,9 @@ static ssize_t polarity_store(struct device *child,
 		return -EINVAL;
 
 	mutex_lock(&export->lock);
-	ret = pwm_set_polarity(pwm, polarity);
+	pwm_get_state(pwm, &state);
+	state.polarity = polarity;
+	ret = pwm_apply_state(pwm, &state);
 	mutex_unlock(&export->lock);
 
 	return ret ? : size;
-- 
2.39.5