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[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>
This commit is contained in:
Antti Palosaari 2014-12-23 13:14:36 -03:00 committed by Mauro Carvalho Chehab
parent c56222a6b2
commit d0f232e823
1 changed files with 31 additions and 0 deletions
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31
drivers/media/usb/dvb-usb-v2/rtl28xxu.c
View File

@ -523,6 +523,35 @@ static int rtl2832u_read_config(struct dvb_usb_device *d)
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,