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Commit d0f232e8 authored by Antti Palosaari's avatar Antti Palosaari Committed by Mauro Carvalho Chehab
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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: default avatarAntti Palosaari <crope@iki.fi>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@osg.samsung.com>
parent c56222a6

drivers/media/usb/dvb-usb-v2/rtl28xxu.c

+31 −0
Original line number Diff line number Diff line
@@ -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,