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media: add panel register access functions

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These functions provide write access to the internal LCD panel registers
which also control the sensor. They can be used to disable the
preprocessor, set the illumination brightness, and adjust gain/contrast
(which are stored together in one register internally called "vsvideo").

Signed-off-by: Florian Echtler <floe@butterbrot.org>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Florian Echtler 2018-02-08 03:43:05 -05:00 committed by Mauro Carvalho Chehab
parent 4e6c558148
commit bbc0c4eb6b
1 changed files with 75 additions and 0 deletions
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75
drivers/input/touchscreen/sur40.c
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@ -257,6 +257,81 @@ static int sur40_command(struct sur40_state *dev,
0x00, index, buffer, size, 1000);
}
/* poke a byte in the panel register space */
static int sur40_poke(struct sur40_state *dev, u8 offset, u8 value)
{
int result;
u8 index = 0x96; // 0xae for permanent write
result = usb_control_msg(dev->usbdev, usb_sndctrlpipe(dev->usbdev, 0),
SUR40_POKE, USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT,
0x32, index, NULL, 0, 1000);
if (result < 0)
goto error;
msleep(5);
result = usb_control_msg(dev->usbdev, usb_sndctrlpipe(dev->usbdev, 0),
SUR40_POKE, USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT,
0x72, offset, NULL, 0, 1000);
if (result < 0)
goto error;
msleep(5);
result = usb_control_msg(dev->usbdev, usb_sndctrlpipe(dev->usbdev, 0),
SUR40_POKE, USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT,
0xb2, value, NULL, 0, 1000);
if (result < 0)
goto error;
msleep(5);
error:
return result;
}
static int sur40_set_preprocessor(struct sur40_state *dev, u8 value)
{
u8 setting_07[2] = { 0x01, 0x00 };
u8 setting_17[2] = { 0x85, 0x80 };
int result;
if (value > 1)
return -ERANGE;
result = usb_control_msg(dev->usbdev, usb_sndctrlpipe(dev->usbdev, 0),
SUR40_POKE, USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT,
0x07, setting_07[value], NULL, 0, 1000);
if (result < 0)
goto error;
msleep(5);
result = usb_control_msg(dev->usbdev, usb_sndctrlpipe(dev->usbdev, 0),
SUR40_POKE, USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT,
0x17, setting_17[value], NULL, 0, 1000);
if (result < 0)
goto error;
msleep(5);
error:
return result;
}
static void sur40_set_vsvideo(struct sur40_state *handle, u8 value)
{
int i;
for (i = 0; i < 4; i++)
sur40_poke(handle, 0x1c+i, value);
handle->vsvideo = value;
}
static void sur40_set_irlevel(struct sur40_state *handle, u8 value)
{
int i;
for (i = 0; i < 8; i++)
sur40_poke(handle, 0x08+(2*i), value);
}
/* Initialization routine, called from sur40_open */
static int sur40_init(struct sur40_state *dev)
{