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[media] si2157: detect if firmware is running

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Detect if firmware is running run-time and download / start it only
when needed. Detection is done by reading IF frequency value.
Garbage value is returned by firmware when it is not running,
otherwise correct value is returned.

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 2016-02-08 09:51:16 -02:00 committed by Mauro Carvalho Chehab
parent 8a73faab0a
commit 78bab93026
2 changed files with 13 additions and 7 deletions
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19
drivers/media/tuners/si2157.c
View file

@ -84,11 +84,22 @@ static int si2157_init(struct dvb_frontend *fe)
struct si2157_cmd cmd;
const struct firmware *fw;
const char *fw_name;
unsigned int chip_id;
unsigned int uitmp, chip_id;
dev_dbg(&client->dev, "\n");
if (dev->fw_loaded)
/* Returned IF frequency is garbage when firmware is not running */
memcpy(cmd.args, "\x15\x00\x06\x07", 4);
cmd.wlen = 4;
cmd.rlen = 4;
ret = si2157_cmd_execute(client, &cmd);
if (ret)
goto err;
uitmp = cmd.args[2] << 0 | cmd.args[3] << 8;
dev_dbg(&client->dev, "if_frequency kHz=%u\n", uitmp);
if (uitmp == dev->if_frequency / 1000)
goto warm;
/* power up */
@ -203,9 +214,6 @@ static int si2157_init(struct dvb_frontend *fe)
dev_info(&client->dev, "firmware version: %c.%c.%d\n",
cmd.args[6], cmd.args[7], cmd.args[8]);
dev->fw_loaded = true;
warm:
/* init statistics in order signal app which are supported */
c->strength.len = 1;
@ -422,7 +430,6 @@ static int si2157_probe(struct i2c_client *client,
dev->fe = cfg->fe;
dev->inversion = cfg->inversion;
dev->if_port = cfg->if_port;
dev->fw_loaded = false;
dev->chiptype = (u8)id->driver_data;
dev->if_frequency = 5000000; /* default value of property 0x0706 */
mutex_init(&dev->i2c_mutex);

1
drivers/media/tuners/si2157_priv.h
View file

@ -26,7 +26,6 @@ struct si2157_dev {
struct mutex i2c_mutex;
struct dvb_frontend *fe;
bool active;
bool fw_loaded;
bool inversion;
u8 chiptype;
u8 if_port;