From e090901e48ba75508caaa1b98fdbb65591c1163f Mon Sep 17 00:00:00 2001 From: Mauro Carvalho Chehab Date: Fri, 26 Apr 2013 10:22:47 -0300 Subject: [PATCH] [media] saa7115: move the autodetection code out of the probe function MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit 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 Tested-by: Jon Arne Jørgensen Tested-by: Ezequiel Garcia Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab --- drivers/media/i2c/saa7115.c | 133 ++++++++++++++++++++++-------------- 1 file changed, 83 insertions(+), 50 deletions(-) diff --git a/drivers/media/i2c/saa7115.c b/drivers/media/i2c/saa7115.c index eecb92df5d96..289f460801db 100644 --- a/drivers/media/i2c/saa7115.c +++ b/drivers/media/i2c/saa7115.c @@ -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; -- 2.30.2