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V4L/DVB (13419): gspca - pac7302: Add debug register write interface.

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Add debug register write interface to pac7302 to be able to set
for example the edge detect mode (bit 2 register 0x55) or the
test pattern (bit 0..3, register 0x72) and test overlay (bit 4,
register 0x72) from the user space. Only write of register
page 0 is supported by this patch.

Signed-off-by: Márton Németh <nm127@freemail.hu>
Signed-off-by: Jean-Francois Moine <moinejf@free.fr>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Márton Németh 2009-11-09 07:10:46 -03:00 committed by Mauro Carvalho Chehab
parent 4d0fc03a76
commit 6763cc0e54
1 changed files with 54 additions and 0 deletions
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54
drivers/media/video/gspca/pac7302.c
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@ -68,6 +68,7 @@
#define MODULE_NAME "pac7302"
#include <media/v4l2-chip-ident.h>
#include "gspca.h"
MODULE_AUTHOR("Thomas Kaiser thomas@kaiser-linux.li");
@ -1143,6 +1144,55 @@ static int sd_getvflip(struct gspca_dev *gspca_dev, __s32 *val)
return 0;
}
#ifdef CONFIG_VIDEO_ADV_DEBUG
static int sd_dbg_s_register(struct gspca_dev *gspca_dev,
struct v4l2_dbg_register *reg)
{
int ret = -EINVAL;
__u8 index;
__u8 value;
/* reg->reg: bit0..15: reserved for register index (wIndex is 16bit
long on the USB bus)
*/
if (reg->match.type == V4L2_CHIP_MATCH_HOST &&
reg->match.addr == 0 &&
(reg->reg < 0x000000ff) &&
(reg->val <= 0x000000ff)
) {
/* Currently writing to page 0 is only supported. */
/* reg_w() only supports 8bit index */
index = reg->reg & 0x000000ff;
value = reg->val & 0x000000ff;
/* Note that there shall be no access to other page
by any other function between the page swith and
the actual register write */
ret = reg_w(gspca_dev, 0xff, 0x00); /* page 0 */
if (0 <= ret)
ret = reg_w(gspca_dev, index, value);
if (0 <= ret)
ret = reg_w(gspca_dev, 0xdc, 0x01);
}
return ret;
}
static int sd_chip_ident(struct gspca_dev *gspca_dev,
struct v4l2_dbg_chip_ident *chip)
{
int ret = -EINVAL;
if (chip->match.type == V4L2_CHIP_MATCH_HOST &&
chip->match.addr == 0) {
chip->revision = 0;
chip->ident = V4L2_IDENT_UNKNOWN;
ret = 0;
}
return ret;
}
#endif
/* sub-driver description for pac7302 */
static struct sd_desc sd_desc = {
.name = MODULE_NAME,
@ -1155,6 +1205,10 @@ static struct sd_desc sd_desc = {
.stop0 = sd_stop0,
.pkt_scan = sd_pkt_scan,
.dq_callback = do_autogain,
#ifdef CONFIG_VIDEO_ADV_DEBUG
.set_register = sd_dbg_s_register,
.get_chip_ident = sd_chip_ident,
#endif
};
/* -- module initialisation -- */