i2c: add i2c_get_device_id() to get the standard i2c device id (dde67eb1) · Commits · 戴 / test

drivers/i2c/i2c-core-base.c

+33 −0

Original line number	Diff line number	Diff line
		@@ -58,6 +58,8 @@
		#define I2C_ADDR_7BITS_MAX 0x77
		#define I2C_ADDR_7BITS_COUNT (I2C_ADDR_7BITS_MAX + 1)

		#define I2C_ADDR_DEVICE_ID 0x7c

		/*
		* core_lock protects i2c_adapter_idr, and guarantees that device detection,
		* deletion of detected devices, and attach_adapter calls are serialized
		@@ -1968,6 +1970,37 @@ int i2c_transfer_buffer_flags(const struct i2c_client client, char buf,
		}
		EXPORT_SYMBOL(i2c_transfer_buffer_flags);

		/**
		* i2c_get_device_id - get manufacturer, part id and die revision of a device
		* @client: The device to query
		* @id: The queried information
		*
		* Returns negative errno on error, zero on success.
		*/
		int i2c_get_device_id(const struct i2c_client *client,
		struct i2c_device_identity *id)
		{
		struct i2c_adapter *adap = client->adapter;
		union i2c_smbus_data raw_id;
		int ret;

		if (!i2c_check_functionality(adap, I2C_FUNC_SMBUS_READ_I2C_BLOCK))
		return -EOPNOTSUPP;

		raw_id.block[0] = 3;
		ret = i2c_smbus_xfer(adap, I2C_ADDR_DEVICE_ID, 0,
		I2C_SMBUS_READ, client->addr << 1,
		I2C_SMBUS_I2C_BLOCK_DATA, &raw_id);
		if (ret)
		return ret;

		id->manufacturer_id = (raw_id.block[1] << 4) \| (raw_id.block[2] >> 4);
		id->part_id = ((raw_id.block[2] & 0xf) << 5) \| (raw_id.block[3] >> 3);
		id->die_revision = raw_id.block[3] & 0x7;
		return 0;
		}
		EXPORT_SYMBOL_GPL(i2c_get_device_id);

		/* ----------------------------------------------------
		* the i2c address scanning function
		* Will not work for 10-bit addresses!

include/linux/i2c.h

+30 −0

Original line number	Diff line number	Diff line
		@@ -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,

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