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authorBrad Love <brad@nextdimension.cc>2020-02-02 00:48:26 +0300
committerMauro Carvalho Chehab <mchehab+huawei@kernel.org>2020-03-12 11:27:08 +0300
commit889968a4f76928ce08a607d576d6ffd7c3521925 (patch)
tree16772e75a83837a5ce95de3abbee6d5c560719cf /drivers/media
parent985b0edefa3146a59005832c2b271f9290635b31 (diff)
downloadlinux-889968a4f76928ce08a607d576d6ffd7c3521925.tar.xz
media: dw2102: probe for demodulator i2c address
This is required to support the Terratec S2 USB Box Revision 4, which reused usb vid:pid, but has a different demodulator (m88ds3103b) at i2c address 0x6a. [fixed checkpatch issues] Signed-off-by: Michael Bunk <micha@freedict.org> Signed-off-by: Brad Love <brad@nextdimension.cc> Signed-off-by: Sean Young <sean@mess.org> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Diffstat (limited to 'drivers/media')
-rw-r--r--drivers/media/usb/dvb-usb/dw2102.c45
1 files changed, 43 insertions, 2 deletions
diff --git a/drivers/media/usb/dvb-usb/dw2102.c b/drivers/media/usb/dvb-usb/dw2102.c
index 8b584507dd59..1007366a295b 100644
--- a/drivers/media/usb/dvb-usb/dw2102.c
+++ b/drivers/media/usb/dvb-usb/dw2102.c
@@ -1524,6 +1524,29 @@ static int m88rs2000_frontend_attach(struct dvb_usb_adapter *adap)
return -EIO;
}
+static int tt_s2_4600_frontend_attach_probe_demod(struct dvb_usb_device *d,
+ const int probe_addr)
+{
+ struct dw2102_state *state = d->priv;
+
+ state->data[0] = 0x9;
+ state->data[1] = 0x1;
+ state->data[2] = 0x1;
+ state->data[3] = probe_addr;
+ state->data[4] = 0x0;
+
+ if (dvb_usb_generic_rw(d, state->data, 5, state->data, 2, 0) < 0) {
+ err("i2c probe for address 0x%x failed.", probe_addr);
+ return 0;
+ }
+
+ if (state->data[0] != 8) /* fail(7) or error, no device at address */
+ return 0;
+
+ /* probing successful */
+ return 1;
+}
+
static int tt_s2_4600_frontend_attach(struct dvb_usb_adapter *adap)
{
struct dvb_usb_device *d = adap->dev;
@@ -1533,6 +1556,7 @@ static int tt_s2_4600_frontend_attach(struct dvb_usb_adapter *adap)
struct i2c_board_info board_info;
struct m88ds3103_platform_data m88ds3103_pdata = {};
struct ts2020_config ts2020_config = {};
+ int demod_addr;
mutex_lock(&d->data_mutex);
@@ -1570,8 +1594,22 @@ static int tt_s2_4600_frontend_attach(struct dvb_usb_adapter *adap)
if (dvb_usb_generic_rw(d, state->data, 1, state->data, 1, 0) < 0)
err("command 0x51 transfer failed.");
+ /* probe for demodulator i2c address */
+ demod_addr = -1;
+ if (tt_s2_4600_frontend_attach_probe_demod(d, 0x68))
+ demod_addr = 0x68;
+ else if (tt_s2_4600_frontend_attach_probe_demod(d, 0x69))
+ demod_addr = 0x69;
+ else if (tt_s2_4600_frontend_attach_probe_demod(d, 0x6a))
+ demod_addr = 0x6a;
+
mutex_unlock(&d->data_mutex);
+ if (demod_addr < 0) {
+ err("probing for demodulator failed. Is the external power switched on?");
+ return -ENODEV;
+ }
+
/* attach demod */
m88ds3103_pdata.clk = 27000000;
m88ds3103_pdata.i2c_wr_max = 33;
@@ -1586,8 +1624,11 @@ static int tt_s2_4600_frontend_attach(struct dvb_usb_adapter *adap)
m88ds3103_pdata.lnb_hv_pol = 1;
m88ds3103_pdata.lnb_en_pol = 0;
memset(&board_info, 0, sizeof(board_info));
- strscpy(board_info.type, "m88ds3103", I2C_NAME_SIZE);
- board_info.addr = 0x68;
+ if (demod_addr == 0x6a)
+ strscpy(board_info.type, "m88ds3103b", I2C_NAME_SIZE);
+ else
+ strscpy(board_info.type, "m88ds3103", I2C_NAME_SIZE);
+ board_info.addr = demod_addr;
board_info.platform_data = &m88ds3103_pdata;
request_module("m88ds3103");
client = i2c_new_client_device(&d->i2c_adap, &board_info);