[PATCH v8 2/3] pwm_backlight: use power sequences

[Alexandre Courbot <acourbot@nvidia.com>]

Make use of the power sequences specified in the device tree or platform
data to control how the backlight is powered on and off.

Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Reviewed-by: Stephen Warren <swarren@wwwdotorg.org>
---
 .../bindings/video/backlight/pwm-backlight.txt     |  63 +++++++-
 drivers/video/backlight/Kconfig                    |   1 +
 drivers/video/backlight/pwm_bl.c                   | 160 ++++++++++++++++-----
 include/linux/pwm_backlight.h                      |  18 ++-
 4 files changed, 202 insertions(+), 40 deletions(-)

diff --git a/Documentation/devicetree/bindings/video/backlight/pwm-backlight.txt b/Documentation/devicetree/bindings/video/backlight/pwm-backlight.txt
index 1e4fc72..b20e98e 100644
--- a/Documentation/devicetree/bindings/video/backlight/pwm-backlight.txt
+++ b/Documentation/devicetree/bindings/video/backlight/pwm-backlight.txt
@@ -13,16 +13,73 @@ Required properties:
 
 Optional properties:
   - pwm-names: a list of names for the PWM devices specified in the
-               "pwms" property (see PWM binding[0])
+      "pwms" property (see PWM binding[0]).
+  - power-sequences: Power sequences (see Power sequences[1]) used to bring the
+      backlight on and off. If this property is present, then two power
+      sequences named "power-on" and "power-off" must be defined to control how
+      the backlight is to be powered on and off. These sequences must reference
+      the PWM specified in the pwms property by its name, and can also reference
+      other resources supported by the power sequences mechanism
 
 [0]: Documentation/devicetree/bindings/pwm/pwm.txt
+[1]: Documentation/devicetree/bindings/power/power_seq.txt
 
 Example:
 
 	backlight {
 		compatible = "pwm-backlight";
-		pwms = <&pwm 0 5000000>;
-
 		brightness-levels = <0 4 8 16 32 64 128 255>;
 		default-brightness-level = <6>;
+		low-threshold-brightness = <50>;
+
+		/* resources used by the power sequences */
+		pwms = <&pwm 0 5000000>;
+		pwm-names = "backlight";
+		power-supply = <&backlight_reg>;
+
+		power-sequences {
+			power-on {
+				step0 {
+					type = "regulator";
+					id = "power";
+					enable;
+				};
+				step1 {
+					type = "delay";
+					delay = <10000>;
+				};
+				step2 {
+					type = "pwm";
+					id = "backlight";
+					enable;
+				};
+				step3 {
+					type = "gpio";
+					gpio = <&gpio 28 0>;
+					value = <1>;
+				};
+			};
+
+			power-off {
+				step0 {
+					type = "gpio";
+					gpio = <&gpio 28 0>;
+					value = <0>;
+				};
+				step1 {
+					type = "pwm";
+					id = "backlight";
+					disable;
+				};
+				step2 {
+					type = "delay";
+					delay = <10000>;
+				};
+				step3 {
+					type = "regulator";
+					id = "power";
+					disable;
+				};
+			};
+		};
 	};
diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
index 765a945..a6b0640 100644
--- a/drivers/video/backlight/Kconfig
+++ b/drivers/video/backlight/Kconfig
@@ -240,6 +240,7 @@ config BACKLIGHT_CARILLO_RANCH
 config BACKLIGHT_PWM
 	tristate "Generic PWM based Backlight Driver"
 	depends on PWM
+	select POWER_SEQ
 	help
 	  If you have a LCD backlight adjustable by PWM, say Y to enable
 	  this driver.
diff --git a/drivers/video/backlight/pwm_bl.c b/drivers/video/backlight/pwm_bl.c
index 069983c..cfc0780 100644
--- a/drivers/video/backlight/pwm_bl.c
+++ b/drivers/video/backlight/pwm_bl.c
@@ -27,6 +27,12 @@ struct pwm_bl_data {
 	unsigned int		period;
 	unsigned int		lth_brightness;
 	unsigned int		*levels;
+	bool			enabled;
+	struct power_seq_set	power_seqs;
+	struct power_seq	*power_on_seq;
+	struct power_seq	*power_off_seq;
+
+	/* Legacy callbacks */
 	int			(*notify)(struct device *,
 					  int brightness);
 	void			(*notify_after)(struct device *,
@@ -35,6 +41,51 @@ struct pwm_bl_data {
 	void			(*exit)(struct device *);
 };
 
+static void pwm_backlight_on(struct backlight_device *bl)
+{
+	struct pwm_bl_data *pb = dev_get_drvdata(&bl->dev);
+	int ret;
+
+	if (pb->enabled)
+		return;
+
+	if (pb->power_on_seq) {
+		ret = power_seq_run(pb->power_on_seq);
+		if (ret < 0) {
+			dev_err(&bl->dev, "cannot run power on sequence\n");
+			return;
+		}
+	} else {
+		/* legacy framework */
+		pwm_enable(pb->pwm);
+	}
+
+	pb->enabled = true;
+}
+
+static void pwm_backlight_off(struct backlight_device *bl)
+{
+	struct pwm_bl_data *pb = dev_get_drvdata(&bl->dev);
+	int ret;
+
+	if (!pb->enabled)
+		return;
+
+	if (pb->power_off_seq) {
+		ret = power_seq_run(pb->power_off_seq);
+		if (ret < 0) {
+			dev_err(&bl->dev, "cannot run power off sequence\n");
+			return;
+		}
+	} else {
+		/* legacy framework */
+		pwm_config(pb->pwm, 0, pb->period);
+		pwm_disable(pb->pwm);
+	}
+
+	pb->enabled = false;
+}
+
 static int pwm_backlight_update_status(struct backlight_device *bl)
 {
 	struct pwm_bl_data *pb = dev_get_drvdata(&bl->dev);
@@ -51,8 +102,7 @@ static int pwm_backlight_update_status(struct backlight_device *bl)
 		brightness = pb->notify(pb->dev, brightness);
 
 	if (brightness = 0) {
-		pwm_config(pb->pwm, 0, pb->period);
-		pwm_disable(pb->pwm);
+		pwm_backlight_off(bl);
 	} else {
 		int duty_cycle;
 
@@ -66,7 +116,7 @@ static int pwm_backlight_update_status(struct backlight_device *bl)
 		duty_cycle = pb->lth_brightness +
 		     (duty_cycle * (pb->period - pb->lth_brightness) / max);
 		pwm_config(pb->pwm, duty_cycle, pb->period);
-		pwm_enable(pb->pwm);
+		pwm_backlight_on(bl);
 	}
 
 	if (pb->notify_after)
@@ -145,11 +195,10 @@ static int pwm_backlight_parse_dt(struct device *dev,
 		data->max_brightness--;
 	}
 
-	/*
-	 * TODO: Most users of this driver use a number of GPIOs to control
-	 *       backlight power. Support for specifying these needs to be
-	 *       added.
-	 */
+	/* read power sequences */
+	data->power_seqs = devm_of_parse_power_seq_set(dev);
+	if (IS_ERR(data->power_seqs))
+		return PTR_ERR(data->power_seqs);
 
 	return 0;
 }
@@ -172,6 +221,7 @@ static int pwm_backlight_probe(struct platform_device *pdev)
 {
 	struct platform_pwm_backlight_data *data = pdev->dev.platform_data;
 	struct platform_pwm_backlight_data defdata;
+	struct power_seq_resource *res;
 	struct backlight_properties props;
 	struct backlight_device *bl;
 	struct pwm_bl_data *pb;
@@ -180,7 +230,9 @@ static int pwm_backlight_probe(struct platform_device *pdev)
 
 	if (!data) {
 		ret = pwm_backlight_parse_dt(&pdev->dev, &defdata);
-		if (ret < 0) {
+		if (ret = -EPROBE_DEFER) {
+			return ret;
+		} else if (ret < 0) {
 			dev_err(&pdev->dev, "failed to find platform data\n");
 			return ret;
 		}
@@ -201,6 +253,68 @@ static int pwm_backlight_probe(struct platform_device *pdev)
 		goto err_alloc;
 	}
 
+	if (data->power_seqs) {
+		/* use power sequences */
+		struct power_seq_set *seqs = &pb->power_seqs;
+
+		power_seq_set_init(seqs, &pdev->dev);
+		power_seq_set_add_sequences(seqs, data->power_seqs);
+
+		/* Check that the required sequences are here */
+		pb->power_on_seq = power_seq_lookup(seqs, "power-on");
+		if (!pb->power_on_seq) {
+			dev_err(&pdev->dev, "missing power-on sequence\n");
+			return -EINVAL;
+		}
+		pb->power_off_seq = power_seq_lookup(seqs, "power-off");
+		if (!pb->power_off_seq) {
+			dev_err(&pdev->dev, "missing power-off sequence\n");
+			return -EINVAL;
+		}
+
+		/* we must have exactly one PWM resource for this driver */
+		power_seq_for_each_resource(res, seqs) {
+			if (res->type != POWER_SEQ_PWM)
+				continue;
+			if (pb->pwm) {
+				dev_err(&pdev->dev, "more than one PWM used\n");
+				return -EINVAL;
+			}
+			/* keep the pwm at hand */
+			pb->pwm = res->pwm.pwm;
+		}
+		/* from here we should have a PWM */
+		if (!pb->pwm) {
+			dev_err(&pdev->dev, "no PWM defined!\n");
+			return -EINVAL;
+		}
+	} else {
+		/* use legacy interface */
+		pb->pwm = devm_pwm_get(&pdev->dev, NULL);
+		if (IS_ERR(pb->pwm)) {
+			dev_err(&pdev->dev,
+				"unable to request PWM, trying legacy API\n");
+
+			pb->pwm = pwm_request(data->pwm_id, "pwm-backlight");
+			if (IS_ERR(pb->pwm)) {
+				dev_err(&pdev->dev,
+					"unable to request legacy PWM\n");
+				ret = PTR_ERR(pb->pwm);
+				goto err_alloc;
+			}
+		}
+
+		dev_dbg(&pdev->dev, "got pwm for backlight\n");
+
+		/*
+		* The DT case will set the pwm_period_ns field to 0 and store
+		* the period, parsed from the DT, in the PWM device. For the
+		* non-DT case, set the period from platform data.
+		*/
+		if (data->pwm_period_ns > 0)
+			pwm_set_period(pb->pwm, data->pwm_period_ns);
+	}
+
 	if (data->levels) {
 		max = data->levels[data->max_brightness];
 		pb->levels = data->levels;
@@ -213,28 +327,6 @@ static int pwm_backlight_probe(struct platform_device *pdev)
 	pb->exit = data->exit;
 	pb->dev = &pdev->dev;
 
-	pb->pwm = devm_pwm_get(&pdev->dev, NULL);
-	if (IS_ERR(pb->pwm)) {
-		dev_err(&pdev->dev, "unable to request PWM, trying legacy API\n");
-
-		pb->pwm = pwm_request(data->pwm_id, "pwm-backlight");
-		if (IS_ERR(pb->pwm)) {
-			dev_err(&pdev->dev, "unable to request legacy PWM\n");
-			ret = PTR_ERR(pb->pwm);
-			goto err_alloc;
-		}
-	}
-
-	dev_dbg(&pdev->dev, "got pwm for backlight\n");
-
-	/*
-	 * The DT case will set the pwm_period_ns field to 0 and store the
-	 * period, parsed from the DT, in the PWM device. For the non-DT case,
-	 * set the period from platform data.
-	 */
-	if (data->pwm_period_ns > 0)
-		pwm_set_period(pb->pwm, data->pwm_period_ns);
-
 	pb->period = pwm_get_period(pb->pwm);
 	pb->lth_brightness = data->lth_brightness * (pb->period / max);
 
@@ -267,8 +359,7 @@ static int pwm_backlight_remove(struct platform_device *pdev)
 	struct pwm_bl_data *pb = dev_get_drvdata(&bl->dev);
 
 	backlight_device_unregister(bl);
-	pwm_config(pb->pwm, 0, pb->period);
-	pwm_disable(pb->pwm);
+	pwm_backlight_off(bl);
 	if (pb->exit)
 		pb->exit(&pdev->dev);
 	return 0;
@@ -282,8 +373,7 @@ static int pwm_backlight_suspend(struct device *dev)
 
 	if (pb->notify)
 		pb->notify(pb->dev, 0);
-	pwm_config(pb->pwm, 0, pb->period);
-	pwm_disable(pb->pwm);
+	pwm_backlight_off(bl);
 	if (pb->notify_after)
 		pb->notify_after(pb->dev, 0);
 	return 0;
diff --git a/include/linux/pwm_backlight.h b/include/linux/pwm_backlight.h
index 56f4a86..0dcec1d 100644
--- a/include/linux/pwm_backlight.h
+++ b/include/linux/pwm_backlight.h
@@ -5,14 +5,28 @@
 #define __LINUX_PWM_BACKLIGHT_H
 
 #include <linux/backlight.h>
+#include <linux/power_seq.h>
 
 struct platform_pwm_backlight_data {
-	int pwm_id;
 	unsigned int max_brightness;
 	unsigned int dft_brightness;
 	unsigned int lth_brightness;
-	unsigned int pwm_period_ns;
 	unsigned int *levels;
+	/*
+	 * New interface using power sequences. Must include exactly
+	 * two power sequences named 'power-on' and 'power-off'. If NULL,
+	 * the legacy interface is used.
+	 */
+	struct platform_power_seq_set *power_seqs;
+
+	/*
+	 * Legacy interface - use power sequences instead!
+	 *
+	 * pwm_id and pwm_period_ns need only be specified
+	 * if get_pwm(dev, NULL) would return NULL.
+	 */
+	int pwm_id;
+	unsigned int pwm_period_ns;
 	int (*init)(struct device *dev);
 	int (*notify)(struct device *dev, int brightness);
 	void (*notify_after)(struct device *dev, int brightness);
-- 
1.8.0