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i2c: add i2c_get_device_id() to get the standard i2c device id

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Can be used during probe to double check that the probed device is
what is expected.

Loosely based on code from Adrian Fiergolski <adrian.fiergolski@cern.ch>.

Tested-by: Adrian Fiergolski <adrian.fiergolski@cern.ch>
Reviewed-by: Wolfram Sang <wsa@the-dreams.de>
Signed-off-by: Peter Rosin <peda@axentia.se>
This commit is contained in:
Peter Rosin
2018-01-22 08:32:01 +01:00
parent 4a3928c6f8
commit dde67eb1be
2 changed files with 63 additions and 0 deletions
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30
include/linux/i2c.h
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@@ -47,6 +47,7 @@ struct i2c_algorithm;
struct i2c_adapter;
struct i2c_client;
struct i2c_driver;
struct i2c_device_identity;
union i2c_smbus_data;
struct i2c_board_info;
enum i2c_slave_event;
@@ -186,8 +187,37 @@ extern s32 i2c_smbus_write_i2c_block_data(const struct i2c_client *client,
extern s32
i2c_smbus_read_i2c_block_data_or_emulated(const struct i2c_client *client,
u8 command, u8 length, u8 *values);
int i2c_get_device_id(const struct i2c_client *client,
struct i2c_device_identity *id);
#endif /* I2C */
/**
* struct i2c_device_identity - i2c client device identification
* @manufacturer_id: 0 - 4095, database maintained by NXP
* @part_id: 0 - 511, according to manufacturer
* @die_revision: 0 - 7, according to manufacturer
*/
struct i2c_device_identity {
u16 manufacturer_id;
#define I2C_DEVICE_ID_NXP_SEMICONDUCTORS 0
#define I2C_DEVICE_ID_NXP_SEMICONDUCTORS_1 1
#define I2C_DEVICE_ID_NXP_SEMICONDUCTORS_2 2
#define I2C_DEVICE_ID_NXP_SEMICONDUCTORS_3 3
#define I2C_DEVICE_ID_RAMTRON_INTERNATIONAL 4
#define I2C_DEVICE_ID_ANALOG_DEVICES 5
#define I2C_DEVICE_ID_STMICROELECTRONICS 6
#define I2C_DEVICE_ID_ON_SEMICONDUCTOR 7
#define I2C_DEVICE_ID_SPRINTEK_CORPORATION 8
#define I2C_DEVICE_ID_ESPROS_PHOTONICS_AG 9
#define I2C_DEVICE_ID_FUJITSU_SEMICONDUCTOR 10
#define I2C_DEVICE_ID_FLIR 11
#define I2C_DEVICE_ID_O2MICRO 12
#define I2C_DEVICE_ID_ATMEL 13
#define I2C_DEVICE_ID_NONE 0xffff
u16 part_id;
u8 die_revision;
};
enum i2c_alert_protocol {
I2C_PROTOCOL_SMBUS_ALERT,
I2C_PROTOCOL_SMBUS_HOST_NOTIFY,