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drm/dsi: Implement DCS set/get display brightness 

Provide a small convenience wrapper that set/get the display brightness.

Cc: John Stultz <john.stultz@linaro.org>
Cc: Sumit Semwal <sumit.semwal@linaro.org>
Cc: Archit Taneja <archit.taneja@gmail.com>
Cc: Rob Clark <robdclark@gmail.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: Emil Velikov <emil.l.velikov@gmail.com>
Signed-off-by: Vinay Simha BN <simhavcs@gmail.com>
Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Vinay Simha BN 2016-07-31 20:45:22 +05:30 committed by Thierry Reding
parent bbdcf516a6
commit 1a9d759331
2 changed files with 53 additions and 0 deletions
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49
drivers/gpu/drm/drm_mipi_dsi.c
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@ -1041,6 +1041,55 @@ int mipi_dsi_dcs_set_tear_scanline(struct mipi_dsi_device *dsi, u16 scanline)
}
EXPORT_SYMBOL(mipi_dsi_dcs_set_tear_scanline);
/**
* mipi_dsi_dcs_set_display_brightness() - sets the brightness value of the
* display
* @dsi: DSI peripheral device
* @brightness: brightness value
*
* Return: 0 on success or a negative error code on failure.
*/
int mipi_dsi_dcs_set_display_brightness(struct mipi_dsi_device *dsi,
u16 brightness)
{
u8 payload[2] = { brightness & 0xff, brightness >> 8 };
ssize_t err;
err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_DISPLAY_BRIGHTNESS,
payload, sizeof(payload));
if (err < 0)
return err;
return 0;
}
EXPORT_SYMBOL(mipi_dsi_dcs_set_display_brightness);
/**
* mipi_dsi_dcs_get_display_brightness() - gets the current brightness value
* of the display
* @dsi: DSI peripheral device
* @brightness: brightness value
*
* Return: 0 on success or a negative error code on failure.
*/
int mipi_dsi_dcs_get_display_brightness(struct mipi_dsi_device *dsi,
u16 *brightness)
{
ssize_t err;
err = mipi_dsi_dcs_read(dsi, MIPI_DCS_GET_DISPLAY_BRIGHTNESS,
brightness, sizeof(*brightness));
if (err <= 0) {
if (err == 0)
err = -ENODATA;
return err;
}
return 0;
}
EXPORT_SYMBOL(mipi_dsi_dcs_get_display_brightness);
static int mipi_dsi_drv_probe(struct device *dev)
{
struct mipi_dsi_driver *drv = to_mipi_dsi_driver(dev->driver);

4
include/drm/drm_mipi_dsi.h
View File

@ -270,6 +270,10 @@ int mipi_dsi_dcs_set_tear_on(struct mipi_dsi_device *dsi,
enum mipi_dsi_dcs_tear_mode mode);
int mipi_dsi_dcs_set_pixel_format(struct mipi_dsi_device *dsi, u8 format);
int mipi_dsi_dcs_set_tear_scanline(struct mipi_dsi_device *dsi, u16 scanline);
int mipi_dsi_dcs_set_display_brightness(struct mipi_dsi_device *dsi,
u16 brightness);
int mipi_dsi_dcs_get_display_brightness(struct mipi_dsi_device *dsi,
u16 *brightness);
/**
* struct mipi_dsi_driver - DSI driver