[PATCH 0/5] Backlight drivers for SH and ARM SH-Mobile boards

[PATCH 0/5] Backlight drivers for SH and ARM SH-Mobile boards

[Laurent Pinchart]

Hello,

Here are two backlight drivers used by SH and ARM SH-Mobile boards.

The first driver supports simple GPIO-controlled backlights that are turned on
or off by a single GPIO (either active high or active low).

The second driver supports the Sanyo LV5207LP LED driver
(http://www.onsemi.com/pub_link/Collateral/ENA0943-D.PDF) and exposes the main
LED only as a backlight device, as that's all the board I need to driver for
uses.

The last three patches port the ARM SH-Mobile Mackerel, SH Ecovec24 and SH
KFR2R09 boards to use the new backlight drivers. The code has been compile
tested on all three platforms and runtime tested on Mackerel only as I don't
have access to the SH boards.

Laurent Pinchart (5):
  backlight: Add GPIO-based backlight driver
  backlight: Add Sanyo LV5207LP backlight driver
  ARM: mach-shmobile: mackerel: Use gpio-backlight
  sh: ecovec24: Use gpio-backlight
  sh: kfr2r09: Use lv5207lp backlight

 arch/arm/mach-shmobile/board-mackerel.c     |   34 +++---
 arch/sh/boards/mach-ecovec24/setup.c        |   37 +++---
 arch/sh/boards/mach-kfr2r09/lcd_wqvga.c     |   48 --------
 arch/sh/boards/mach-kfr2r09/setup.c         |   19 ++-
 arch/sh/include/mach-kfr2r09/mach/kfr2r09.h |    2 -
 drivers/video/backlight/Kconfig             |   13 ++
 drivers/video/backlight/Makefile            |    2 +
 drivers/video/backlight/gpio_backlight.c    |  158 +++++++++++++++++++++++++
 drivers/video/backlight/lv5207lp.c          |  171 +++++++++++++++++++++++++++
 include/linux/platform_data/lv5207lp.h      |   20 +++
 include/video/gpio_backlight.h              |   21 ++++
 11 files changed, 436 insertions(+), 89 deletions(-)
 create mode 100644 drivers/video/backlight/gpio_backlight.c
 create mode 100644 drivers/video/backlight/lv5207lp.c
 create mode 100644 include/linux/platform_data/lv5207lp.h
 create mode 100644 include/video/gpio_backlight.h

-- 
Regards,

Laurent Pinchart

[PATCH 2/5] backlight: Add Sanyo LV5207LP backlight driver

[Laurent Pinchart]

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
---
 drivers/video/backlight/Kconfig        |    6 +
 drivers/video/backlight/Makefile       |    1 +
 drivers/video/backlight/lv5207lp.c     |  171 ++++++++++++++++++++++++++++++++
 include/linux/platform_data/lv5207lp.h |   20 ++++
 4 files changed, 198 insertions(+), 0 deletions(-)
 create mode 100644 drivers/video/backlight/lv5207lp.c
 create mode 100644 include/linux/platform_data/lv5207lp.h

diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
index 259442d..92ce5aa 100644
--- a/drivers/video/backlight/Kconfig
+++ b/drivers/video/backlight/Kconfig
@@ -397,6 +397,12 @@ config BACKLIGHT_GPIO
 	  If you have a LCD backlight adjustable by GPIO, say Y to enable
 	  this driver.
 
+config BACKLIGHT_LV5207LP
+	tristate "Sanyo LV5207LP Backlight"
+	depends on I2C
+	help
+	  If you have a Sanyo LV5207LP say Y to enable the backlight driver.
+
 endif # BACKLIGHT_CLASS_DEVICE
 
 endif # BACKLIGHT_LCD_SUPPORT
diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile
index ec91c4a..125b8ad 100644
--- a/drivers/video/backlight/Makefile
+++ b/drivers/video/backlight/Makefile
@@ -46,3 +46,4 @@ obj-$(CONFIG_BACKLIGHT_AAT2870) += aat2870_bl.o
 obj-$(CONFIG_BACKLIGHT_OT200) += ot200_bl.o
 obj-$(CONFIG_BACKLIGHT_TPS65217) += tps65217_bl.o
 obj-$(CONFIG_BACKLIGHT_GPIO)	+= gpio_backlight.o
+obj-$(CONFIG_BACKLIGHT_LV5207LP)	+= lv5207lp.o
diff --git a/drivers/video/backlight/lv5207lp.c b/drivers/video/backlight/lv5207lp.c
new file mode 100644
index 0000000..b06f35c
--- /dev/null
+++ b/drivers/video/backlight/lv5207lp.c
@@ -0,0 +1,171 @@
+/*
+ * Sanyo LV5207LP LED Driver
+ *
+ * Copyright (C) 2012 Ideas on board SPRL
+ *
+ * Contact: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/backlight.h>
+#include <linux/err.h>
+#include <linux/fb.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/platform_data/lv5207lp.h>
+
+#define LV5207LP_CTRL1			0x00
+#define LV5207LP_CPSW			(1 << 7)
+#define LV5207LP_SCTEN			(1 << 6)
+#define LV5207LP_C10			(1 << 5)
+#define LV5207LP_CKSW			(1 << 4)
+#define LV5207LP_RSW			(1 << 3)
+#define LV5207LP_GSW			(1 << 2)
+#define LV5207LP_BSW			(1 << 1)
+#define LV5207LP_CTRL2			0x01
+#define LV5207LP_MSW			(1 << 7)
+#define LV5207LP_MLED4			(1 << 6)
+#define LV5207LP_RED			0x02
+#define LV5207LP_GREEN			0x03
+#define LV5207LP_BLUE			0x04
+
+#define LV5207LP_MAX_BRIGHTNESS		32
+
+struct lv5207lp {
+	struct i2c_client *client;
+	struct backlight_device *backlight;
+	struct lv5207lp_platform_data *pdata;
+};
+
+static int lv5207lp_write(struct lv5207lp *lv, u8 reg, u8 data)
+{
+	return i2c_smbus_write_byte_data(lv->client, reg, data);
+}
+
+static int lv5207lp_backlight_update_status(struct backlight_device *backlight)
+{
+	struct lv5207lp *lv = bl_get_data(backlight);
+	int brightness = backlight->props.brightness;
+
+	if (backlight->props.power != FB_BLANK_UNBLANK ||
+	    backlight->props.fb_blank != FB_BLANK_UNBLANK ||
+	    backlight->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK))
+		brightness = 0;
+
+	if (brightness) {
+		lv5207lp_write(lv, LV5207LP_CTRL1,
+			       LV5207LP_CPSW | LV5207LP_C10 | LV5207LP_CKSW);
+		lv5207lp_write(lv, LV5207LP_CTRL2,
+			       LV5207LP_MSW | LV5207LP_MLED4 |
+			       (brightness - 1));
+	} else {
+		lv5207lp_write(lv, LV5207LP_CTRL1, 0);
+		lv5207lp_write(lv, LV5207LP_CTRL2, 0);
+	}
+
+	return 0;
+}
+
+static int lv5207lp_backlight_get_brightness(struct backlight_device *backlight)
+{
+	return backlight->props.brightness;
+}
+
+static int lv5207lp_backlight_check_fb(struct backlight_device *backlight,
+				       struct fb_info *info)
+{
+	struct lv5207lp *lv = bl_get_data(backlight);
+
+	return lv->pdata->fbdev = info->dev;
+}
+
+static const struct backlight_ops lv5207lp_backlight_ops = {
+	.options	= BL_CORE_SUSPENDRESUME,
+	.update_status	= lv5207lp_backlight_update_status,
+	.get_brightness	= lv5207lp_backlight_get_brightness,
+	.check_fb	= lv5207lp_backlight_check_fb,
+};
+
+static int lv5207lp_probe(struct i2c_client *client,
+			  const struct i2c_device_id *id)
+{
+	struct lv5207lp_platform_data *pdata = client->dev.platform_data;
+	struct backlight_device *backlight;
+	struct backlight_properties props;
+	struct lv5207lp *lv;
+
+	if (pdata = NULL) {
+		dev_err(&client->dev, "No platform data supplied\n");
+		return -EINVAL;
+	}
+
+	if (!i2c_check_functionality(client->adapter,
+				     I2C_FUNC_SMBUS_BYTE_DATA)) {
+		dev_warn(&client->dev,
+			 "I2C adapter doesn't support I2C_FUNC_SMBUS_BYTE\n");
+		return -EIO;
+	}
+
+	lv = devm_kzalloc(&client->dev, sizeof(*lv), GFP_KERNEL);
+	if (!lv)
+		return -ENOMEM;
+
+	lv->client = client;
+	lv->pdata = pdata;
+
+	memset(&props, 0, sizeof(props));
+	props.type = BACKLIGHT_RAW;
+	props.max_brightness = min_t(unsigned int, pdata->max_value,
+				     LV5207LP_MAX_BRIGHTNESS);
+	props.brightness = clamp_t(unsigned int, pdata->def_value, 0,
+				   props.max_brightness);
+
+	backlight = backlight_device_register(dev_name(&client->dev),
+					      &lv->client->dev, lv,
+					      &lv5207lp_backlight_ops, &props);
+	if (IS_ERR(backlight)) {
+		dev_err(&client->dev, "failed to register backlight\n");
+		return PTR_ERR(backlight);
+	}
+
+	backlight_update_status(backlight);
+	i2c_set_clientdata(client, backlight);
+
+	return 0;
+}
+
+static int lv5207lp_remove(struct i2c_client *client)
+{
+	struct backlight_device *backlight = i2c_get_clientdata(client);
+
+	backlight->props.brightness = 0;
+	backlight_update_status(backlight);
+	backlight_device_unregister(backlight);
+
+	return 0;
+}
+
+static const struct i2c_device_id lv5207lp_ids[] = {
+	{ "lv5207lp", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, lv5207lp_ids);
+
+static struct i2c_driver lv5207lp_driver = {
+	.driver = {
+		.name = "lv5207lp",
+	},
+	.probe = lv5207lp_probe,
+	.remove = lv5207lp_remove,
+	.id_table = lv5207lp_ids,
+};
+
+module_i2c_driver(lv5207lp_driver);
+
+MODULE_DESCRIPTION("Sanyo LV5207LP Backlight Driver");
+MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/platform_data/lv5207lp.h b/include/linux/platform_data/lv5207lp.h
new file mode 100644
index 0000000..ac95cb1
--- /dev/null
+++ b/include/linux/platform_data/lv5207lp.h
@@ -0,0 +1,20 @@
+/*
+ * lv5207lp.h - Sanyo LV5207LP LEDs Driver
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#ifndef __LV5207LP_H__
+#define __LV5207LP_H__
+
+struct device;
+
+struct lv5207lp_platform_data {
+	struct device *fbdev;
+	unsigned int max_value;
+	unsigned int def_value;
+};
+
+#endif
+
-- 
1.7.8.6

Re: [PATCH 2/5] backlight: Add Sanyo LV5207LP backlight driver

[Jingoo Han]

On Saturday, November 24, 2012 1:35 AM, Laurent Pinchart wrote
> 
> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>


CC'ed Andrew Morton


Acked-by: Jingoo Han <jg1.han@samsung.com>


Best regards,
Jingoo Han

> ---
>  drivers/video/backlight/Kconfig        |    6 +
>  drivers/video/backlight/Makefile       |    1 +
>  drivers/video/backlight/lv5207lp.c     |  171 ++++++++++++++++++++++++++++++++
>  include/linux/platform_data/lv5207lp.h |   20 ++++
>  4 files changed, 198 insertions(+), 0 deletions(-)
>  create mode 100644 drivers/video/backlight/lv5207lp.c
>  create mode 100644 include/linux/platform_data/lv5207lp.h
> 
> diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
> index 259442d..92ce5aa 100644
> --- a/drivers/video/backlight/Kconfig
> +++ b/drivers/video/backlight/Kconfig
> @@ -397,6 +397,12 @@ config BACKLIGHT_GPIO
>  	  If you have a LCD backlight adjustable by GPIO, say Y to enable
>  	  this driver.
> 
> +config BACKLIGHT_LV5207LP
> +	tristate "Sanyo LV5207LP Backlight"
> +	depends on I2C
> +	help
> +	  If you have a Sanyo LV5207LP say Y to enable the backlight driver.
> +
>  endif # BACKLIGHT_CLASS_DEVICE
> 
>  endif # BACKLIGHT_LCD_SUPPORT
> diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile
> index ec91c4a..125b8ad 100644
> --- a/drivers/video/backlight/Makefile
> +++ b/drivers/video/backlight/Makefile
> @@ -46,3 +46,4 @@ obj-$(CONFIG_BACKLIGHT_AAT2870) += aat2870_bl.o
>  obj-$(CONFIG_BACKLIGHT_OT200) += ot200_bl.o
>  obj-$(CONFIG_BACKLIGHT_TPS65217) += tps65217_bl.o
>  obj-$(CONFIG_BACKLIGHT_GPIO)	+= gpio_backlight.o
> +obj-$(CONFIG_BACKLIGHT_LV5207LP)	+= lv5207lp.o
> diff --git a/drivers/video/backlight/lv5207lp.c b/drivers/video/backlight/lv5207lp.c
> new file mode 100644
> index 0000000..b06f35c
> --- /dev/null
> +++ b/drivers/video/backlight/lv5207lp.c
> @@ -0,0 +1,171 @@
> +/*
> + * Sanyo LV5207LP LED Driver
> + *
> + * Copyright (C) 2012 Ideas on board SPRL
> + *
> + * Contact: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + */
> +
> +#include <linux/backlight.h>
> +#include <linux/err.h>
> +#include <linux/fb.h>
> +#include <linux/i2c.h>
> +#include <linux/module.h>
> +#include <linux/slab.h>
> +#include <linux/platform_data/lv5207lp.h>
> +
> +#define LV5207LP_CTRL1			0x00
> +#define LV5207LP_CPSW			(1 << 7)
> +#define LV5207LP_SCTEN			(1 << 6)
> +#define LV5207LP_C10			(1 << 5)
> +#define LV5207LP_CKSW			(1 << 4)
> +#define LV5207LP_RSW			(1 << 3)
> +#define LV5207LP_GSW			(1 << 2)
> +#define LV5207LP_BSW			(1 << 1)
> +#define LV5207LP_CTRL2			0x01
> +#define LV5207LP_MSW			(1 << 7)
> +#define LV5207LP_MLED4			(1 << 6)
> +#define LV5207LP_RED			0x02
> +#define LV5207LP_GREEN			0x03
> +#define LV5207LP_BLUE			0x04
> +
> +#define LV5207LP_MAX_BRIGHTNESS		32
> +
> +struct lv5207lp {
> +	struct i2c_client *client;
> +	struct backlight_device *backlight;
> +	struct lv5207lp_platform_data *pdata;
> +};
> +
> +static int lv5207lp_write(struct lv5207lp *lv, u8 reg, u8 data)
> +{
> +	return i2c_smbus_write_byte_data(lv->client, reg, data);
> +}
> +
> +static int lv5207lp_backlight_update_status(struct backlight_device *backlight)
> +{
> +	struct lv5207lp *lv = bl_get_data(backlight);
> +	int brightness = backlight->props.brightness;
> +
> +	if (backlight->props.power != FB_BLANK_UNBLANK ||
> +	    backlight->props.fb_blank != FB_BLANK_UNBLANK ||
> +	    backlight->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK))
> +		brightness = 0;
> +
> +	if (brightness) {
> +		lv5207lp_write(lv, LV5207LP_CTRL1,
> +			       LV5207LP_CPSW | LV5207LP_C10 | LV5207LP_CKSW);
> +		lv5207lp_write(lv, LV5207LP_CTRL2,
> +			       LV5207LP_MSW | LV5207LP_MLED4 |
> +			       (brightness - 1));
> +	} else {
> +		lv5207lp_write(lv, LV5207LP_CTRL1, 0);
> +		lv5207lp_write(lv, LV5207LP_CTRL2, 0);
> +	}
> +
> +	return 0;
> +}
> +
> +static int lv5207lp_backlight_get_brightness(struct backlight_device *backlight)
> +{
> +	return backlight->props.brightness;
> +}
> +
> +static int lv5207lp_backlight_check_fb(struct backlight_device *backlight,
> +				       struct fb_info *info)
> +{
> +	struct lv5207lp *lv = bl_get_data(backlight);
> +
> +	return lv->pdata->fbdev = info->dev;
> +}
> +
> +static const struct backlight_ops lv5207lp_backlight_ops = {
> +	.options	= BL_CORE_SUSPENDRESUME,
> +	.update_status	= lv5207lp_backlight_update_status,
> +	.get_brightness	= lv5207lp_backlight_get_brightness,
> +	.check_fb	= lv5207lp_backlight_check_fb,
> +};
> +
> +static int lv5207lp_probe(struct i2c_client *client,
> +			  const struct i2c_device_id *id)
> +{
> +	struct lv5207lp_platform_data *pdata = client->dev.platform_data;
> +	struct backlight_device *backlight;
> +	struct backlight_properties props;
> +	struct lv5207lp *lv;
> +
> +	if (pdata = NULL) {
> +		dev_err(&client->dev, "No platform data supplied\n");
> +		return -EINVAL;
> +	}
> +
> +	if (!i2c_check_functionality(client->adapter,
> +				     I2C_FUNC_SMBUS_BYTE_DATA)) {
> +		dev_warn(&client->dev,
> +			 "I2C adapter doesn't support I2C_FUNC_SMBUS_BYTE\n");
> +		return -EIO;
> +	}
> +
> +	lv = devm_kzalloc(&client->dev, sizeof(*lv), GFP_KERNEL);
> +	if (!lv)
> +		return -ENOMEM;
> +
> +	lv->client = client;
> +	lv->pdata = pdata;
> +
> +	memset(&props, 0, sizeof(props));
> +	props.type = BACKLIGHT_RAW;
> +	props.max_brightness = min_t(unsigned int, pdata->max_value,
> +				     LV5207LP_MAX_BRIGHTNESS);
> +	props.brightness = clamp_t(unsigned int, pdata->def_value, 0,
> +				   props.max_brightness);
> +
> +	backlight = backlight_device_register(dev_name(&client->dev),
> +					      &lv->client->dev, lv,
> +					      &lv5207lp_backlight_ops, &props);
> +	if (IS_ERR(backlight)) {
> +		dev_err(&client->dev, "failed to register backlight\n");
> +		return PTR_ERR(backlight);
> +	}
> +
> +	backlight_update_status(backlight);
> +	i2c_set_clientdata(client, backlight);
> +
> +	return 0;
> +}
> +
> +static int lv5207lp_remove(struct i2c_client *client)
> +{
> +	struct backlight_device *backlight = i2c_get_clientdata(client);
> +
> +	backlight->props.brightness = 0;
> +	backlight_update_status(backlight);
> +	backlight_device_unregister(backlight);
> +
> +	return 0;
> +}
> +
> +static const struct i2c_device_id lv5207lp_ids[] = {
> +	{ "lv5207lp", 0 },
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(i2c, lv5207lp_ids);
> +
> +static struct i2c_driver lv5207lp_driver = {
> +	.driver = {
> +		.name = "lv5207lp",
> +	},
> +	.probe = lv5207lp_probe,
> +	.remove = lv5207lp_remove,
> +	.id_table = lv5207lp_ids,
> +};
> +
> +module_i2c_driver(lv5207lp_driver);
> +
> +MODULE_DESCRIPTION("Sanyo LV5207LP Backlight Driver");
> +MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
> +MODULE_LICENSE("GPL");
> diff --git a/include/linux/platform_data/lv5207lp.h b/include/linux/platform_data/lv5207lp.h
> new file mode 100644
> index 0000000..ac95cb1
> --- /dev/null
> +++ b/include/linux/platform_data/lv5207lp.h
> @@ -0,0 +1,20 @@
> +/*
> + * lv5207lp.h - Sanyo LV5207LP LEDs Driver
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + */
> +#ifndef __LV5207LP_H__
> +#define __LV5207LP_H__
> +
> +struct device;
> +
> +struct lv5207lp_platform_data {
> +	struct device *fbdev;
> +	unsigned int max_value;
> +	unsigned int def_value;
> +};
> +
> +#endif
> +
> --
> 1.7.8.6
> 
> --
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Re: [PATCH 2/5] backlight: Add Sanyo LV5207LP backlight driver

[Jingoo Han]

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