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hwmon: (ftsteutates) Add i2c detect functionality 

Signed-off-by: Thilo Cestonaro <thilo@cestona.ro>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Thilo Cestonaro 2016-08-16 13:07:53 +02:00 committed by Guenter Roeck
parent ed42cfa881
commit 2d5aee433d
1 changed files with 45 additions and 0 deletions
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45
drivers/hwmon/ftsteutates.c
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@ -36,6 +36,10 @@
#define FTS_EVENT_STATUS_REG 0x0006
#define FTS_GLOBAL_CONTROL_REG 0x0007
#define FTS_DEVICE_DETECT_REG_1 0x0C
#define FTS_DEVICE_DETECT_REG_2 0x0D
#define FTS_DEVICE_DETECT_REG_3 0x0E
#define FTS_SENSOR_EVENT_REG 0x0010
#define FTS_FAN_EVENT_REG 0x0014
@ -54,6 +58,8 @@
#define FTS_NO_TEMP_SENSORS 0x10
#define FTS_NO_VOLT_SENSORS 0x04
static const unsigned short normal_i2c[] = { 0x73, I2C_CLIENT_END };
static struct i2c_device_id fts_id[] = {
{ "ftsteutates", 0 },
{ }
@ -734,6 +740,42 @@ static const struct attribute_group *fts_attr_groups[] = {
/*****************************************************************************/
/* Module initialization / remove functions */
/*****************************************************************************/
static int fts_detect(struct i2c_client *client,
struct i2c_board_info *info)
{
int val;
/* detection works with revsion greater or equal to 0x2b */
val = i2c_smbus_read_byte_data(client, FTS_DEVICE_REVISION_REG);
if (val < 0x2b)
return -ENODEV;
/* Device Detect Regs must have 0x17 0x34 and 0x54 */
val = i2c_smbus_read_byte_data(client, FTS_DEVICE_DETECT_REG_1);
if (val != 0x17)
return -ENODEV;
val = i2c_smbus_read_byte_data(client, FTS_DEVICE_DETECT_REG_2);
if (val != 0x34)
return -ENODEV;
val = i2c_smbus_read_byte_data(client, FTS_DEVICE_DETECT_REG_3);
if (val != 0x54)
return -ENODEV;
/*
* 0x10 == Baseboard Management Controller, 0x01 == Teutates
* Device ID Reg needs to be 0x11
*/
val = i2c_smbus_read_byte_data(client, FTS_DEVICE_ID_REG);
if (val != 0x11)
return -ENODEV;
strlcpy(info->type, fts_id[0].name, I2C_NAME_SIZE);
info->flags = 0;
return 0;
}
static int fts_remove(struct i2c_client *client)
{
struct fts_data *data = dev_get_drvdata(&client->dev);
@ -804,12 +846,15 @@ static int fts_probe(struct i2c_client *client, const struct i2c_device_id *id)
/* Module Details */
/*****************************************************************************/
static struct i2c_driver fts_driver = {
.class = I2C_CLASS_HWMON,
.driver = {
.name = "ftsteutates",
},
.id_table = fts_id,
.probe = fts_probe,
.remove = fts_remove,
.detect = fts_detect,
.address_list = normal_i2c,
};
module_i2c_driver(fts_driver);