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 <cr...@iki.fi>
---
drivers/media/usb/dvb-usb-v2/rtl28xxu.c | 31 +++++++++++++++++++++++++++++++
1 file changed, 31 insertions(+)
diff --git a/drivers/media/usb/dvb-usb-v2/rtl28xxu.c
b/drivers/media/usb/dvb-usb-v2/rtl28xxu.c
index b0d2467..5bc7774 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,
--
http://palosaari.fi/
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