diff options
| author | Antti Palosaari <crope@iki.fi> | 2014-12-23 19:14:36 +0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@osg.samsung.com> | 2015-02-03 21:25:24 +0300 |
| commit | d0f232e823af54a2554e371b5c96189facb1434b (patch) | |
| tree | a9b8c944463defbda2233a1b191a9856cc01e0ba /drivers | |
| parent | c56222a6b25c24f211ecefd6ecc1003a7cb075d4 (diff) | |
| download | linux-d0f232e823af54a2554e371b5c96189facb1434b.tar.xz | |
[media] rtl28xxu: add heuristic to detect chip type
Detect automatically whether chip is old RTL2831U or newer
RTL2832U/RTL2832P. Detection is based I2C command that is found only
from newer RTL2832U models.
Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/media/usb/dvb-usb-v2/rtl28xxu.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/drivers/media/usb/dvb-usb-v2/rtl28xxu.c b/drivers/media/usb/dvb-usb-v2/rtl28xxu.c index b0d2467398f2..5bc77745b737 100644 --- a/drivers/media/usb/dvb-usb-v2/rtl28xxu.c +++ b/drivers/media/usb/dvb-usb-v2/rtl28xxu.c @@ -523,6 +523,35 @@ err: return ret; } +static int rtl28xxu_identify_state(struct dvb_usb_device *d, const char **name) +{ + struct rtl28xxu_dev *dev = d_to_priv(d); + int ret; + struct rtl28xxu_req req_demod_i2c = {0x0020, CMD_I2C_DA_RD, 0, NULL}; + + dev_dbg(&d->intf->dev, "\n"); + + /* + * Detect chip type using I2C command that is not supported + * by old RTL2831U. + */ + ret = rtl28xxu_ctrl_msg(d, &req_demod_i2c); + if (ret == -EPIPE) { + dev->chip_id = CHIP_ID_RTL2831U; + } else if (ret == 0) { + dev->chip_id = CHIP_ID_RTL2832U; + } else { + dev_err(&d->intf->dev, "chip type detection failed %d\n", ret); + goto err; + } + dev_dbg(&d->intf->dev, "chip_id=%u\n", dev->chip_id); + + return WARM; +err: + dev_dbg(&d->intf->dev, "failed=%d\n", ret); + return ret; +} + static const struct rtl2830_platform_data rtl2830_mt2060_platform_data = { .clk = 28800000, .spec_inv = 1, @@ -1590,6 +1619,7 @@ static const struct dvb_usb_device_properties rtl2831u_props = { .adapter_nr = adapter_nr, .size_of_priv = sizeof(struct rtl28xxu_dev), + .identify_state = rtl28xxu_identify_state, .power_ctrl = rtl2831u_power_ctrl, .i2c_algo = &rtl28xxu_i2c_algo, .read_config = rtl2831u_read_config, @@ -1620,6 +1650,7 @@ static const struct dvb_usb_device_properties rtl2832u_props = { .adapter_nr = adapter_nr, .size_of_priv = sizeof(struct rtl28xxu_dev), + .identify_state = rtl28xxu_identify_state, .power_ctrl = rtl2832u_power_ctrl, .frontend_ctrl = rtl2832u_frontend_ctrl, .i2c_algo = &rtl28xxu_i2c_algo, |