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authorAntti Palosaari <crope@iki.fi>2014-12-23 13:14:36 -0300
committerMauro Carvalho Chehab <mchehab@osg.samsung.com>2015-02-03 16:25:24 -0200
commitd0f232e823af54a2554e371b5c96189facb1434b (patch)
treea9b8c944463defbda2233a1b191a9856cc01e0ba /drivers/media
parentc56222a6b25c24f211ecefd6ecc1003a7cb075d4 (diff)
[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/media')
-rw-r--r--drivers/media/usb/dvb-usb-v2/rtl28xxu.c31
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,