[media] em28xx: add support for EM28174 chip

EM28174 is very similar as already supported EM2874.
I am not sure what are differences, but it could be analog support.

Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

4 files changed, 12 insertions, 2 deletions

diff --git a/drivers/media/video/em28xx/em28xx-cards.c b/drivers/media/video/em28xx/em28xx-cards.c
index bdd8618dad36..9a5ac562ee33 100644
--- a/drivers/media/video/em28xx/em28xx-cards.c
+++ b/drivers/media/video/em28xx/em28xx-cards.c
@@ -2810,6 +2810,11 @@ static int em28xx_init_dev(struct em28xx **devhandle, struct usb_device *udev,
                         dev->reg_gpio_num = EM2874_R80_GPIO;
                         dev->wait_after_write = 0;
                         break;
+                case CHIP_ID_EM28174:
+                        em28xx_info("chip ID is em28174\n");
+                        dev->reg_gpio_num = EM2874_R80_GPIO;
+                        dev->wait_after_write = 0;
+                        break;
                 case CHIP_ID_EM2883:
                         em28xx_info("chip ID is em2882/em2883\n");
                         dev->wait_after_write = 0;
diff --git a/drivers/media/video/em28xx/em28xx-core.c b/drivers/media/video/em28xx/em28xx-core.c
index 44c63cbd6dda..92b6dd84f1f6 100644
--- a/drivers/media/video/em28xx/em28xx-core.c
+++ b/drivers/media/video/em28xx/em28xx-core.c
@@ -614,7 +614,7 @@ int em28xx_capture_start(struct em28xx *dev, int start)
 {
         int rc;
 
-        if (dev->chip_id == CHIP_ID_EM2874) {
+        if (dev->chip_id == CHIP_ID_EM2874 || dev->chip_id == CHIP_ID_EM28174) {
                 /* The Transport Stream Enable Register moved in em2874 */
                 if (!start) {
                         rc = em28xx_write_reg_bits(dev, EM2874_R5F_TS_ENABLE,
@@ -1111,6 +1111,10 @@ int em28xx_isoc_dvb_max_packetsize(struct em28xx *dev)
                 /* FIXME - for now assume 564 like it was before, but the
                    em2874 code should be added to return the proper value... */
                 packet_size = 564;
+        } else if (dev->chip_id == CHIP_ID_EM28174) {
+                /* FIXME same as em2874. 564 was enough for 22 Mbit DVB-T
+                   but too much for 44 Mbit DVB-C. */
+                packet_size = 752;
         } else {
                 /* TS max packet size stored in bits 1-0 of R01 */
                 chip_cfg2 = em28xx_read_reg(dev, EM28XX_R01_CHIPCFG2);
diff --git a/drivers/media/video/em28xx/em28xx-i2c.c b/drivers/media/video/em28xx/em28xx-i2c.c
index 71474d31e155..4739fc7e6eb3 100644
--- a/drivers/media/video/em28xx/em28xx-i2c.c
+++ b/drivers/media/video/em28xx/em28xx-i2c.c
@@ -332,7 +332,7 @@ static int em28xx_i2c_eeprom(struct em28xx *dev, unsigned char *eedata, int len)
         struct em28xx_eeprom *em_eeprom = (void *)eedata;
         int i, err, size = len, block;
 
-        if (dev->chip_id == CHIP_ID_EM2874) {
+        if (dev->chip_id == CHIP_ID_EM2874 || dev->chip_id == CHIP_ID_EM28174) {
                 /* Empia switched to a 16-bit addressable eeprom in newer
                    devices.  While we could certainly write a routine to read
                    the eeprom, there is nothing of use in there that cannot be
diff --git a/drivers/media/video/em28xx/em28xx-reg.h b/drivers/media/video/em28xx/em28xx-reg.h
index 91e90559642b..e92a28ede434 100644
--- a/drivers/media/video/em28xx/em28xx-reg.h
+++ b/drivers/media/video/em28xx/em28xx-reg.h
@@ -201,6 +201,7 @@ enum em28xx_chip_id {
         CHIP_ID_EM2870 = 35,
         CHIP_ID_EM2883 = 36,
         CHIP_ID_EM2874 = 65,
+        CHIP_ID_EM28174 = 113,
 };
 
 /*