diff mbox

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

Message ID 1353688515-30458-3-git-send-email-laurent.pinchart+renesas@ideasonboard.com (mailing list archive)
State New, archived
Headers show

Commit Message

Laurent Pinchart Nov. 23, 2012, 4:35 p.m. UTC 
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

Comments

Jingoo Han Nov. 26, 2012, 9:38 a.m. UTC | #1 
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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diff mbox

Patch

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
+