Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 6763cc0e authored by Márton Németh's avatar Márton Németh Committed by Mauro Carvalho Chehab
Browse files

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



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: default avatarMárton Németh <nm127@freemail.hu>
Signed-off-by: default avatarJean-Francois Moine <moinejf@free.fr>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@redhat.com>
parent 4d0fc03a

drivers/media/video/gspca/pac7302.c

+54 −0
Original line number Diff line number Diff line
@@ -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 -- */