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Date: Mon, 26 Nov 2012 18:38:47 +0900
From: Jingoo Han <jg1.han@...sung.com>
To: 'Laurent Pinchart' <laurent.pinchart+renesas@...asonboard.com>
Cc: 'Andrew Morton' <akpm@...ux-foundation.org>,
'LKML' <linux-kernel@...r.kernel.org>, linux-sh@...r.kernel.org,
linux-fbdev@...r.kernel.org, 'Paul Mundt' <lethal@...ux-sh.org>,
'Magnus Damm' <magnus.damm@...il.com>,
'Richard Purdie' <rpurdie@...ys.net>,
'Kuninori Morimoto' <kuninori.morimoto.gx@...esas.com>,
'Jingoo Han' <jg1.han@...sung.com>
Subject: Re: [PATCH 2/5] backlight: Add Sanyo LV5207LP backlight driver
On Saturday, November 24, 2012 1:35 AM, Laurent Pinchart wrote
>
> Signed-off-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
CC'ed Andrew Morton
Acked-by: Jingoo Han <jg1.han@...sung.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@...asonboard.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@...asonboard.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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