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[media] em28xx: improve em2710/em2820 distinction 

Chip id 18 is used by the em2710 and em2820.
The current code assumes that if the device is a camera, the chip is an em2710
and an em2820 otherwise.
But it turned out that the em2820 is also used in camera devices.
"Silvercrest 1.3 MPix" webcams for example are available with both chips.
Fortunately both variants are using different generic USD IDs which give us a
hint about the used chip.

Signed-off-by: Frank Schäfer <fschaefer.oss@googlemail.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Frank Schaefer 2013-04-11 15:56:47 -03:00 committed by Mauro Carvalho Chehab
parent 2b64cbd1da
commit 61ff5d69dc
1 changed files with 8 additions and 8 deletions
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16
drivers/media/usb/em28xx/em28xx-cards.c
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@ -2909,6 +2909,14 @@ static int em28xx_init_dev(struct em28xx *dev, struct usb_device *udev,
break;
case CHIP_ID_EM2820:
chip_name = "em2710/2820";
if (dev->udev->descriptor.idVendor == 0xeb1a) {
__le16 idProd = dev->udev->descriptor.idProduct;
if (le16_to_cpu(idProd) == 0x2710)
chip_name = "em2710";
else if (le16_to_cpu(idProd) == 0x2820)
chip_name = "em2820";
}
/* NOTE: the em2820 is used in webcams, too ! */
break;
case CHIP_ID_EM2840:
chip_name = "em2840";
@ -2974,14 +2982,6 @@ static int em28xx_init_dev(struct em28xx *dev, struct usb_device *udev,
em28xx_pre_card_setup(dev);
if (dev->chip_id == CHIP_ID_EM2820) {
if (dev->board.is_webcam)
chip_name = "em2710";
else
chip_name = "em2820";
snprintf(dev->name, sizeof(dev->name), "%s #%d", chip_name, dev->devno);
}
if (!dev->board.is_em2800) {
/* Resets I2C speed */
retval = em28xx_write_reg(dev, EM28XX_R06_I2C_CLK, dev->board.i2c_speed);