> -----Original Message-----
> From: Hiremath, Vaibhav
> Sent: Monday, March 22, 2010 6:42 PM
> To: linux-omap@xxxxxxxxxxxxxxx
> Cc: tomi.valkeinen@xxxxxxxxx; Hiremath, Vaibhav
> Subject: [PATCH] OMAP: LCD LS037V7DW01: Add Backlight driver support
>
> From: Vaibhav Hiremath <hvaibhav@xxxxxx>
>
> Tested on OMAP3EVM for OMAP3530 and AM/DM 3730.
>
[Hiremath, Vaibhav] Tomi,
This patch is also pending, can you please review the same and provide your comments (if any) or merge it to your tree.
Thanks,
Vaibhav
> Signed-off-by: Vaibhav Hiremath <hvaibhav@xxxxxx>
> ---
> arch/arm/mach-omap2/board-omap3evm.c | 32 ++++++++
> .../video/omap2/displays/panel-sharp-ls037v7dw01.c | 75
> ++++++++++++++++++++
> 2 files changed, 107 insertions(+), 0 deletions(-)
>
> diff --git a/arch/arm/mach-omap2/board-omap3evm.c b/arch/arm/mach-
> omap2/board-omap3evm.c
> index f2a52c3..ad74340 100644
> --- a/arch/arm/mach-omap2/board-omap3evm.c
> +++ b/arch/arm/mach-omap2/board-omap3evm.c
> @@ -253,6 +253,36 @@ static void omap3_evm_disable_lcd(struct
> omap_dss_device *dssdev)
> lcd_enabled = 0;
> }
>
> +/*
> + * PWMA/B register offsets (TWL4030_MODULE_PWMA)
> + */
> +#define TWL_LED_EN 0x0
> +#define TWL_LED_PWMON 0x0
> +#define TWL_LED_PWMOFF 0x1
> +
> +static void omap3evm_set_bl_intensity(struct omap_dss_device *dssdev, int
> level)
> +{
> + unsigned char c;
> +
> + if (level > 100)
> + return;
> + /*
> + * Enable LEDA for backlight
> + */
> + twl_i2c_write_u8(TWL4030_MODULE_LED, 0x11, TWL_LED_EN);
> +
> + c = ((125 * (100 - level)) / 100);
> + if (get_omap3_evm_rev() >= OMAP3EVM_BOARD_GEN_2) {
> + c += 1;
> + twl_i2c_write_u8(TWL4030_MODULE_PWMA, 0x7F, TWL_LED_PWMOFF);
> + twl_i2c_write_u8(TWL4030_MODULE_PWMA, c, TWL_LED_PWMON);
> + } else {
> + c += 2;
> + twl_i2c_write_u8(TWL4030_MODULE_PWMA, 0x1, TWL_LED_PWMON);
> + twl_i2c_write_u8(TWL4030_MODULE_PWMA, c, TWL_LED_PWMOFF);
> + }
> +}
> +
> static struct omap_dss_device omap3_evm_lcd_device = {
> .name = "lcd",
> .driver_name = "sharp_ls_panel",
> @@ -260,6 +290,8 @@ static struct omap_dss_device omap3_evm_lcd_device = {
> .phy.dpi.data_lines = 18,
> .platform_enable = omap3_evm_enable_lcd,
> .platform_disable = omap3_evm_disable_lcd,
> + .max_backlight_level = 100,
> + .set_backlight = omap3evm_set_bl_intensity,
> };
>
> static int omap3_evm_enable_tv(struct omap_dss_device *dssdev)
> diff --git a/drivers/video/omap2/displays/panel-sharp-ls037v7dw01.c
> b/drivers/video/omap2/displays/panel-sharp-ls037v7dw01.c
> index 8d51a5e..d4fcd69 100644
> --- a/drivers/video/omap2/displays/panel-sharp-ls037v7dw01.c
> +++ b/drivers/video/omap2/displays/panel-sharp-ls037v7dw01.c
> @@ -20,10 +20,16 @@
> #include <linux/module.h>
> #include <linux/delay.h>
> #include <linux/device.h>
> +#include <linux/backlight.h>
> +#include <linux/fb.h>
> #include <linux/err.h>
>
> #include <plat/display.h>
>
> +struct sharp_data {
> + struct backlight_device *bl;
> +};
> +
> static struct omap_video_timings sharp_ls_timings = {
> .x_res = 480,
> .y_res = 640,
> @@ -39,18 +45,87 @@ static struct omap_video_timings sharp_ls_timings = {
> .vbp = 1,
> };
>
> +static int sharp_ls_bl_update_status(struct backlight_device *bl)
> +{
> + struct omap_dss_device *dssdev = dev_get_drvdata(&bl->dev);
> + int level;
> +
> + if (!dssdev->set_backlight)
> + return -EINVAL;
> +
> + if (bl->props.fb_blank == FB_BLANK_UNBLANK &&
> + bl->props.power == FB_BLANK_UNBLANK)
> + level = bl->props.brightness;
> + else
> + level = 0;
> +
> + return dssdev->set_backlight(dssdev, level);
> +}
> +
> +static int sharp_ls_bl_get_brightness(struct backlight_device *bl)
> +{
> + if (bl->props.fb_blank == FB_BLANK_UNBLANK &&
> + bl->props.power == FB_BLANK_UNBLANK)
> + return bl->props.brightness;
> +
> + return 0;
> +}
> +
> +static const struct backlight_ops sharp_ls_bl_ops = {
> + .get_brightness = sharp_ls_bl_get_brightness,
> + .update_status = sharp_ls_bl_update_status,
> +};
> +
> +
> +
> static int sharp_ls_panel_probe(struct omap_dss_device *dssdev)
> {
> + struct backlight_device *bl;
> + struct sharp_data *sd;
> + int r;
> +
> dssdev->panel.config = OMAP_DSS_LCD_TFT | OMAP_DSS_LCD_IVS |
> OMAP_DSS_LCD_IHS;
> dssdev->panel.acb = 0x28;
> dssdev->panel.timings = sharp_ls_timings;
>
> + sd = kzalloc(sizeof(*sd), GFP_KERNEL);
> + if (!sd)
> + return -ENOMEM;
> +
> + dev_set_drvdata(&dssdev->dev, sd);
> +
> + bl = backlight_device_register("sharp-ls", &dssdev->dev, dssdev,
> + &sharp_ls_bl_ops);
> + if (IS_ERR(bl)) {
> + r = PTR_ERR(bl);
> + kfree(sd);
> + return r;
> + }
> + sd->bl = bl;
> +
> + bl->props.fb_blank = FB_BLANK_UNBLANK;
> + bl->props.power = FB_BLANK_UNBLANK;
> + bl->props.max_brightness = dssdev->max_backlight_level;
> + bl->props.brightness = dssdev->max_backlight_level;
> +
> + r = sharp_ls_bl_update_status(bl);
> + if (r < 0)
> + dev_err(&dssdev->dev, "failed to set lcd brightness\n");
> +
> return 0;
> }
>
> static void sharp_ls_panel_remove(struct omap_dss_device *dssdev)
> {
> + struct sharp_data *sd = dev_get_drvdata(&dssdev->dev);
> + struct backlight_device *bl = sd->bl;
> +
> + bl->props.power = FB_BLANK_POWERDOWN;
> + sharp_ls_bl_update_status(bl);
> + backlight_device_unregister(bl);
> +
> + kfree(sd);
> }
>
> static int sharp_ls_power_on(struct omap_dss_device *dssdev)
> --
> 1.6.2.4
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