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[media] saa7115: move the autodetection code out of the probe function

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As we're now seeing other variants from chinese clones, like
gm1113c, we'll need to add more bits at the detection code.
So, move it into a separate function.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Tested-by: Jon Arne Jørgensen <jonarne@jonarne.no>
Tested-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Mauro Carvalho Chehab 2013-04-26 10:22:47 -03:00
parent 5255e4d9df
commit e090901e48
1 changed files with 83 additions and 50 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

133
drivers/media/i2c/saa7115.c
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@ -1573,46 +1573,103 @@ static const struct v4l2_subdev_ops saa711x_ops = {
/* ----------------------------------------------------------------------- */
/**
* saa711x_detect_chip - Detects the saa711x (or clone) variant
* @client: I2C client structure.
* @id: I2C device ID structure.
* @name: Name of the device to be filled.
* @size: Size of the name var.
*
* Detects the Philips/NXP saa711x chip, or some clone of it.
* if 'id' is NULL or id->driver_data is equal to 1, it auto-probes
* the analog demod.
* If the tuner is not found, it returns -ENODEV.
* If auto-detection is disabled and the tuner doesn't match what it was
* requred, it returns -EINVAL and fills 'name'.
* If the chip is found, it returns the chip ID and fills 'name'.
*/
static int saa711x_detect_chip(struct i2c_client *client,
const struct i2c_device_id *id,
char *name, unsigned size)
{
char chip_ver[size - 1];
char chip_id;
int i;
int autodetect;
autodetect = !id || id->driver_data == 1;
/* Read the chip version register */
for (i = 0; i < size - 1; i++) {
i2c_smbus_write_byte_data(client, 0, i);
chip_ver[i] = i2c_smbus_read_byte_data(client, 0);
name[i] = (chip_ver[i] & 0x0f) + '0';
if (name[i] > '9')
name[i] += 'a' - '9' - 1;
}
name[i] = '\0';
/* Check if it is a Philips/NXP chip */
if (!memcmp(name + 1, "f711", 4)) {
chip_id = name[5];
snprintf(name, size, "saa711%c", chip_id);
if (!autodetect && strcmp(name, id->name))
return -EINVAL;
switch (chip_id) {
case '1':
if (chip_ver[0] & 0xf0) {
snprintf(name, size, "saa711%ca", chip_id);
v4l_info(client, "saa7111a variant found\n");
return V4L2_IDENT_SAA7111A;
}
return V4L2_IDENT_SAA7111;
case '3':
return V4L2_IDENT_SAA7113;
case '4':
return V4L2_IDENT_SAA7114;
case '5':
return V4L2_IDENT_SAA7115;
case '8':
return V4L2_IDENT_SAA7118;
default:
v4l2_info(client,
"WARNING: Philips/NXP chip unknown - Falling back to saa7111\n");
return V4L2_IDENT_SAA7111;
}
}
/* Chip was not discovered. Return its ID and don't bind */
v4l_dbg(1, debug, client, "chip %*ph @ 0x%x is unknown.\n",
16, chip_ver, client->addr << 1);
return -ENODEV;
}
static int saa711x_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct saa711x_state *state;
struct v4l2_subdev *sd;
struct v4l2_ctrl_handler *hdl;
int i;
int ident;
char name[17];
char chip_id;
int autodetect = !id || id->driver_data == 1;
/* Check if the adapter supports the needed features */
if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
return -EIO;
for (i = 0; i < 0x0f; i++) {
i2c_smbus_write_byte_data(client, 0, i);
name[i] = (i2c_smbus_read_byte_data(client, 0) & 0x0f) + '0';
if (name[i] > '9')
name[i] += 'a' - '9' - 1;
}
name[i] = '\0';
chip_id = name[5];
/* Check whether this chip is part of the saa711x series */
if (memcmp(name + 1, "f711", 4)) {
v4l_dbg(1, debug, client, "chip found @ 0x%x (ID %s) does not match a known saa711x chip.\n",
client->addr << 1, name);
ident = saa711x_detect_chip(client, id, name, sizeof(name));
if (ident == -EINVAL) {
/* Chip exists, but doesn't match */
v4l_warn(client, "found %s while %s was expected\n",
name, id->name);
return -ENODEV;
}
if (ident < 0)
return ident;
/* Safety check */
if (!autodetect && id->name[6] != chip_id) {
v4l_warn(client, "found saa711%c while %s was expected\n",
chip_id, id->name);
}
snprintf(client->name, sizeof(client->name), "saa711%c", chip_id);
v4l_info(client, "saa711%c found (%s) @ 0x%x (%s)\n", chip_id, name,
client->addr << 1, client->adapter->name);
strlcpy(client->name, name, sizeof(client->name));
state = devm_kzalloc(&client->dev, sizeof(*state), GFP_KERNEL);
if (state == NULL)
@ -1648,31 +1705,7 @@ static int saa711x_probe(struct i2c_client *client,
state->output = SAA7115_IPORT_ON;
state->enable = 1;
state->radio = 0;
switch (chip_id) {
case '1':
state->ident = V4L2_IDENT_SAA7111;
if (saa711x_read(sd, R_00_CHIP_VERSION) & 0xf0) {
v4l_info(client, "saa7111a variant found\n");
state->ident = V4L2_IDENT_SAA7111A;
}
break;
case '3':
state->ident = V4L2_IDENT_SAA7113;
break;
case '4':
state->ident = V4L2_IDENT_SAA7114;
break;
case '5':
state->ident = V4L2_IDENT_SAA7115;
break;
case '8':
state->ident = V4L2_IDENT_SAA7118;
break;
default:
state->ident = V4L2_IDENT_SAA7111;
v4l2_info(sd, "WARNING: Chip is not known - Falling back to saa7111\n");
break;
}
state->ident = ident;
state->audclk_freq = 48000;