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include/linux/i2c.h
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/* ------------------------------------------------------------------------- */ |
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/* */ |
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/* i2c.h - definitions for the i2c-bus interface */ |
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/* */ |
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/* ------------------------------------------------------------------------- */ /* Copyright (C) 1995-2000 Simon G. Vogl This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ /* ------------------------------------------------------------------------- */ |
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/* With some changes from Kyösti Mälkki <kmalkki@cc.hut.fi> and |
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Frodo Looijaard <frodol@dds.nl> */ |
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#ifndef _LINUX_I2C_H #define _LINUX_I2C_H |
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#include <linux/types.h> |
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#ifdef __KERNEL__ |
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#include <linux/module.h> |
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#include <linux/i2c-id.h> |
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#include <linux/mod_devicetable.h> |
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#include <linux/device.h> /* for struct device */ |
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#include <linux/sched.h> /* for completion */ |
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#include <linux/mutex.h> |
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#include <linux/of.h> /* for struct device_node */ |
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extern struct bus_type i2c_bus_type; |
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extern struct device_type i2c_adapter_type; |
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/* --- General options ------------------------------------------------ */ struct i2c_msg; struct i2c_algorithm; struct i2c_adapter; struct i2c_client; struct i2c_driver; |
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union i2c_smbus_data; |
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struct i2c_board_info; |
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#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) |
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/* * The master routines are the ones normally used to transmit data to devices |
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* on a bus (or read from them). Apart from two basic transfer functions to * transmit one message at a time, a more complex version can be used to |
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* transmit an arbitrary number of messages without interruption. |
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* @count must be be less than 64k since msg.len is u16. |
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*/ |
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extern int i2c_master_send(const struct i2c_client *client, const char *buf, int count); extern int i2c_master_recv(const struct i2c_client *client, char *buf, |
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int count); |
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/* Transfer num messages. */ |
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extern int i2c_transfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num); |
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/* This is the very generalized SMBus access routine. You probably do not want to use this, though; one of the functions below may be much easier, |
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and probably just as fast. |
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Note that we use i2c_adapter here, because you do not need a specific smbus adapter to call this function. */ |
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extern s32 i2c_smbus_xfer(struct i2c_adapter *adapter, u16 addr, unsigned short flags, char read_write, u8 command, int size, union i2c_smbus_data *data); |
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/* Now follow the 'nice' access routines. These also document the calling |
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conventions of i2c_smbus_xfer. */ |
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extern s32 i2c_smbus_read_byte(const struct i2c_client *client); extern s32 i2c_smbus_write_byte(const struct i2c_client *client, u8 value); extern s32 i2c_smbus_read_byte_data(const struct i2c_client *client, u8 command); extern s32 i2c_smbus_write_byte_data(const struct i2c_client *client, |
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u8 command, u8 value); |
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extern s32 i2c_smbus_read_word_data(const struct i2c_client *client, u8 command); extern s32 i2c_smbus_write_word_data(const struct i2c_client *client, |
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u8 command, u16 value); |
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/* Returns the number of read bytes */ |
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extern s32 i2c_smbus_read_block_data(const struct i2c_client *client, |
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u8 command, u8 *values); |
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extern s32 i2c_smbus_write_block_data(const struct i2c_client *client, |
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u8 command, u8 length, const u8 *values); |
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/* Returns the number of read bytes */ |
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extern s32 i2c_smbus_read_i2c_block_data(const struct i2c_client *client, |
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u8 command, u8 length, u8 *values); |
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extern s32 i2c_smbus_write_i2c_block_data(const struct i2c_client *client, |
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u8 command, u8 length, |
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const u8 *values); |
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#endif /* I2C */ |
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/** * struct i2c_driver - represent an I2C device driver * @class: What kind of i2c device we instantiate (for detect) |
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* @attach_adapter: Callback for bus addition (for legacy drivers) * @detach_adapter: Callback for bus removal (for legacy drivers) |
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* @probe: Callback for device binding * @remove: Callback for device unbinding |
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* @shutdown: Callback for device shutdown * @suspend: Callback for device suspend * @resume: Callback for device resume |
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* @alert: Alert callback, for example for the SMBus alert protocol |
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* @command: Callback for bus-wide signaling (optional) * @driver: Device driver model driver * @id_table: List of I2C devices supported by this driver |
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* @detect: Callback for device detection |
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* @address_list: The I2C addresses to probe (for detect) |
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* @clients: List of detected clients we created (for i2c-core use only) |
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* * The driver.owner field should be set to the module owner of this driver. * The driver.name field should be set to the name of this driver. |
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* * For automatic device detection, both @detect and @address_data must * be defined. @class should also be set, otherwise only devices forced * with module parameters will be created. The detect function must * fill at least the name field of the i2c_board_info structure it is * handed upon successful detection, and possibly also the flags field. * * If @detect is missing, the driver will still work fine for enumerated * devices. Detected devices simply won't be supported. This is expected * for the many I2C/SMBus devices which can't be detected reliably, and * the ones which can always be enumerated in practice. * * The i2c_client structure which is handed to the @detect callback is * not a real i2c_client. It is initialized just enough so that you can * call i2c_smbus_read_byte_data and friends on it. Don't do anything * else with it. In particular, calling dev_dbg and friends on it is * not allowed. |
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*/ |
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struct i2c_driver { |
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unsigned int class; |
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|
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/* Notifies the driver that a new bus has appeared or is about to be * removed. You should avoid using this if you can, it will probably * be removed in a near future. |
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*/ int (*attach_adapter)(struct i2c_adapter *); int (*detach_adapter)(struct i2c_adapter *); |
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/* Standard driver model interfaces */ |
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int (*probe)(struct i2c_client *, const struct i2c_device_id *); |
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int (*remove)(struct i2c_client *); |
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/* driver model interfaces that don't relate to enumeration */ void (*shutdown)(struct i2c_client *); int (*suspend)(struct i2c_client *, pm_message_t mesg); int (*resume)(struct i2c_client *); |
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/* Alert callback, for example for the SMBus alert protocol. * The format and meaning of the data value depends on the protocol. * For the SMBus alert protocol, there is a single bit of data passed * as the alert response's low bit ("event flag"). */ void (*alert)(struct i2c_client *, unsigned int data); |
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/* a ioctl like command that can be used to perform specific functions * with the device. */ |
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int (*command)(struct i2c_client *client, unsigned int cmd, void *arg); |
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struct device_driver driver; |
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const struct i2c_device_id *id_table; |
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/* Device detection callback for automatic device creation */ |
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int (*detect)(struct i2c_client *, struct i2c_board_info *); |
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const unsigned short *address_list; |
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struct list_head clients; |
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}; #define to_i2c_driver(d) container_of(d, struct i2c_driver, driver) |
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/** * struct i2c_client - represent an I2C slave device |
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* @flags: I2C_CLIENT_TEN indicates the device uses a ten bit chip address; * I2C_CLIENT_PEC indicates it uses SMBus Packet Error Checking |
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* @addr: Address used on the I2C bus connected to the parent adapter. * @name: Indicates the type of the device, usually a chip name that's * generic enough to hide second-sourcing and compatible revisions. |
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* @adapter: manages the bus segment hosting this I2C device |
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* @driver: device's driver, hence pointer to access routines |
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* @dev: Driver model device node for the slave. |
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* @irq: indicates the IRQ generated by this device (if any) |
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* @detected: member of an i2c_driver.clients list or i2c-core's * userspace_devices list |
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* * An i2c_client identifies a single device (i.e. chip) connected to an |
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* i2c bus. The behaviour exposed to Linux is defined by the driver * managing the device. |
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*/ struct i2c_client { |
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unsigned short flags; /* div., see below */ |
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unsigned short addr; /* chip address - NOTE: 7bit */ |
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/* addresses are stored in the */ |
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/* _LOWER_ 7 bits */ |
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char name[I2C_NAME_SIZE]; |
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struct i2c_adapter *adapter; /* the adapter we sit on */ struct i2c_driver *driver; /* and our access routines */ |
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struct device dev; /* the device structure */ |
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int irq; /* irq issued by device */ |
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struct list_head detected; |
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}; #define to_i2c_client(d) container_of(d, struct i2c_client, dev) |
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extern struct i2c_client *i2c_verify_client(struct device *dev); |
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static inline struct i2c_client *kobj_to_i2c_client(struct kobject *kobj) { |
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struct device * const dev = container_of(kobj, struct device, kobj); return to_i2c_client(dev); |
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} |
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static inline void *i2c_get_clientdata(const struct i2c_client *dev) |
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{ |
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return dev_get_drvdata(&dev->dev); |
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} |
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static inline void i2c_set_clientdata(struct i2c_client *dev, void *data) |
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{ |
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dev_set_drvdata(&dev->dev, data); |
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} |
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/** * struct i2c_board_info - template for device creation |
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* @type: chip type, to initialize i2c_client.name |
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* @flags: to initialize i2c_client.flags * @addr: stored in i2c_client.addr * @platform_data: stored in i2c_client.dev.platform_data |
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* @archdata: copied into i2c_client.dev.archdata |
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* @of_node: pointer to OpenFirmware device node |
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* @irq: stored in i2c_client.irq |
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* |
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* I2C doesn't actually support hardware probing, although controllers and * devices may be able to use I2C_SMBUS_QUICK to tell whether or not there's * a device at a given address. Drivers commonly need more information than * that, such as chip type, configuration, associated IRQ, and so on. * * i2c_board_info is used to build tables of information listing I2C devices |
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* that are present. This information is used to grow the driver model tree. * For mainboards this is done statically using i2c_register_board_info(); * bus numbers identify adapters that aren't yet available. For add-on boards, * i2c_new_device() does this dynamically with the adapter already known. |
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*/ struct i2c_board_info { |
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char type[I2C_NAME_SIZE]; unsigned short flags; unsigned short addr; void *platform_data; |
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struct dev_archdata *archdata; |
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#ifdef CONFIG_OF struct device_node *of_node; #endif |
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int irq; }; /** |
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* I2C_BOARD_INFO - macro used to list an i2c device and its address * @dev_type: identifies the device type |
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* @dev_addr: the device's address on the bus. * * This macro initializes essential fields of a struct i2c_board_info, * declaring what has been provided on a particular board. Optional |
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* fields (such as associated irq, or device-specific platform_data) * are provided using conventional syntax. |
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*/ |
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#define I2C_BOARD_INFO(dev_type, dev_addr) \ |
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.type = dev_type, .addr = (dev_addr) |
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#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) |
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/* Add-on boards should register/unregister their devices; e.g. a board * with integrated I2C, a config eeprom, sensors, and a codec that's * used in conjunction with the primary hardware. */ extern struct i2c_client * i2c_new_device(struct i2c_adapter *adap, struct i2c_board_info const *info); |
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/* If you don't know the exact address of an I2C device, use this variant * instead, which can probe for device presence in a list of possible |
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* addresses. The "probe" callback function is optional. If it is provided, * it must return 1 on successful probe, 0 otherwise. If it is not provided, * a default probing method is used. |
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*/ extern struct i2c_client * i2c_new_probed_device(struct i2c_adapter *adap, struct i2c_board_info *info, |
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unsigned short const *addr_list, int (*probe)(struct i2c_adapter *, unsigned short addr)); |
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/* Common custom probe functions */ extern int i2c_probe_func_quick_read(struct i2c_adapter *, unsigned short addr); |
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/* For devices that use several addresses, use i2c_new_dummy() to make * client handles for the extra addresses. */ extern struct i2c_client * |
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i2c_new_dummy(struct i2c_adapter *adap, u16 address); |
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extern void i2c_unregister_device(struct i2c_client *); |
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#endif /* I2C */ |
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/* Mainboard arch_initcall() code should register all its I2C devices. * This is done at arch_initcall time, before declaring any i2c adapters. * Modules for add-on boards must use other calls. */ |
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#ifdef CONFIG_I2C_BOARDINFO |
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extern int |
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i2c_register_board_info(int busnum, struct i2c_board_info const *info, unsigned n); |
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#else static inline int |
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i2c_register_board_info(int busnum, struct i2c_board_info const *info, unsigned n) |
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{ return 0; } |
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#endif /* I2C_BOARDINFO */ |
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/* * The following structs are for those who like to implement new bus drivers: * i2c_algorithm is the interface to a class of hardware solutions which can * be addressed using the same bus algorithms - i.e. bit-banging or the PCF8584 * to name two of the most common. */ struct i2c_algorithm { |
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/* If an adapter algorithm can't do I2C-level access, set master_xfer |
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to NULL. If an adapter algorithm can do SMBus access, set |
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smbus_xfer. If set to NULL, the SMBus protocol is simulated using common I2C messages */ |
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/* master_xfer should return the number of messages successfully processed, or a negative value on error */ |
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int (*master_xfer)(struct i2c_adapter *adap, struct i2c_msg *msgs, int num); |
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int (*smbus_xfer) (struct i2c_adapter *adap, u16 addr, |
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unsigned short flags, char read_write, u8 command, int size, union i2c_smbus_data *data); |
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/* To determine what the adapter supports */ u32 (*functionality) (struct i2c_adapter *); }; /* * i2c_adapter is the structure used to identify a physical i2c bus along * with the access algorithms necessary to access it. */ struct i2c_adapter { struct module *owner; |
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unsigned int id __deprecated; |
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unsigned int class; /* classes to allow probing for */ |
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const struct i2c_algorithm *algo; /* the algorithm to access the bus */ |
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void *algo_data; |
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/* data fields that are valid for all devices */ |
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struct rt_mutex bus_lock; |
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int timeout; /* in jiffies */ |
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int retries; struct device dev; /* the adapter device */ |
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int nr; |
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char name[48]; |
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struct completion dev_released; |
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struct mutex userspace_clients_lock; |
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struct list_head userspace_clients; |
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}; |
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#define to_i2c_adapter(d) container_of(d, struct i2c_adapter, dev) |
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static inline void *i2c_get_adapdata(const struct i2c_adapter *dev) |
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{ |
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return dev_get_drvdata(&dev->dev); |
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} |
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static inline void i2c_set_adapdata(struct i2c_adapter *dev, void *data) |
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{ |
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dev_set_drvdata(&dev->dev, data); |
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} |
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static inline struct i2c_adapter * i2c_parent_is_i2c_adapter(const struct i2c_adapter *adapter) |
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{ |
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struct device *parent = adapter->dev.parent; if (parent != NULL && parent->type == &i2c_adapter_type) return to_i2c_adapter(parent); else return NULL; |
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} |
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/* Adapter locking functions, exported for shared pin cases */ void i2c_lock_adapter(struct i2c_adapter *); void i2c_unlock_adapter(struct i2c_adapter *); |
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/*flags for the client struct: */ |
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#define I2C_CLIENT_PEC 0x04 /* Use Packet Error Checking */ #define I2C_CLIENT_TEN 0x10 /* we have a ten bit chip address */ /* Must equal I2C_M_TEN below */ #define I2C_CLIENT_WAKE 0x80 /* for board_info; true iff can wake */ |
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/* i2c adapter classes (bitmask) */ #define I2C_CLASS_HWMON (1<<0) /* lm_sensors, ... */ |
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#define I2C_CLASS_DDC (1<<3) /* DDC bus on graphics adapters */ |
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#define I2C_CLASS_SPD (1<<7) /* SPD EEPROMs and similar */ |
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/* Internal numbers to terminate lists */ #define I2C_CLIENT_END 0xfffeU |
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/* The numbers to use to set I2C bus address */ #define ANY_I2C_BUS 0xffff |
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/* Construct an I2C_CLIENT_END-terminated array of i2c addresses */ #define I2C_ADDRS(addr, addrs...) \ ((const unsigned short []){ addr, ## addrs, I2C_CLIENT_END }) |
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/* ----- functions exported by i2c.o */ /* administration... */ |
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#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) |
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extern int i2c_add_adapter(struct i2c_adapter *); extern int i2c_del_adapter(struct i2c_adapter *); |
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extern int i2c_add_numbered_adapter(struct i2c_adapter *); |
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extern int i2c_register_driver(struct module *, struct i2c_driver *); |
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extern void i2c_del_driver(struct i2c_driver *); |
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static inline int i2c_add_driver(struct i2c_driver *driver) { return i2c_register_driver(THIS_MODULE, driver); } |
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extern struct i2c_client *i2c_use_client(struct i2c_client *client); extern void i2c_release_client(struct i2c_client *client); |
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/* call the i2c_client->command() of all attached clients with * the given arguments */ extern void i2c_clients_command(struct i2c_adapter *adap, unsigned int cmd, void *arg); |
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extern struct i2c_adapter *i2c_get_adapter(int id); |
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extern void i2c_put_adapter(struct i2c_adapter *adap); /* Return the functionality mask */ static inline u32 i2c_get_functionality(struct i2c_adapter *adap) { return adap->algo->functionality(adap); } /* Return 1 if adapter supports everything we need, 0 if not. */ static inline int i2c_check_functionality(struct i2c_adapter *adap, u32 func) { return (func & i2c_get_functionality(adap)) == func; } |
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/* Return the adapter number for a specific adapter */ |
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static inline int i2c_adapter_id(struct i2c_adapter *adap) { return adap->nr; } |
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#endif /* I2C */ |
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#endif /* __KERNEL__ */ |
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/** * struct i2c_msg - an I2C transaction segment beginning with START * @addr: Slave address, either seven or ten bits. When this is a ten * bit address, I2C_M_TEN must be set in @flags and the adapter * must support I2C_FUNC_10BIT_ADDR. * @flags: I2C_M_RD is handled by all adapters. No other flags may be * provided unless the adapter exported the relevant I2C_FUNC_* * flags through i2c_check_functionality(). * @len: Number of data bytes in @buf being read from or written to the * I2C slave address. For read transactions where I2C_M_RECV_LEN * is set, the caller guarantees that this buffer can hold up to * 32 bytes in addition to the initial length byte sent by the * slave (plus, if used, the SMBus PEC); and this value will be * incremented by the number of block data bytes received. * @buf: The buffer into which data is read, or from which it's written. * * An i2c_msg is the low level representation of one segment of an I2C * transaction. It is visible to drivers in the @i2c_transfer() procedure, * to userspace from i2c-dev, and to I2C adapter drivers through the * @i2c_adapter.@master_xfer() method. * * Except when I2C "protocol mangling" is used, all I2C adapters implement * the standard rules for I2C transactions. Each transaction begins with a * START. That is followed by the slave address, and a bit encoding read * versus write. Then follow all the data bytes, possibly including a byte * with SMBus PEC. The transfer terminates with a NAK, or when all those * bytes have been transferred and ACKed. If this is the last message in a * group, it is followed by a STOP. Otherwise it is followed by the next * @i2c_msg transaction segment, beginning with a (repeated) START. * * Alternatively, when the adapter supports I2C_FUNC_PROTOCOL_MANGLING then * passing certain @flags may have changed those standard protocol behaviors. * Those flags are only for use with broken/nonconforming slaves, and with * adapters which are known to support the specific mangling options they * need (one or more of IGNORE_NAK, NO_RD_ACK, NOSTART, and REV_DIR_ADDR). |
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*/ struct i2c_msg { __u16 addr; /* slave address */ |
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__u16 flags; |
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#define I2C_M_TEN 0x0010 /* this is a ten bit chip address */ #define I2C_M_RD 0x0001 /* read data, from slave to master */ #define I2C_M_NOSTART 0x4000 /* if I2C_FUNC_PROTOCOL_MANGLING */ #define I2C_M_REV_DIR_ADDR 0x2000 /* if I2C_FUNC_PROTOCOL_MANGLING */ #define I2C_M_IGNORE_NAK 0x1000 /* if I2C_FUNC_PROTOCOL_MANGLING */ #define I2C_M_NO_RD_ACK 0x0800 /* if I2C_FUNC_PROTOCOL_MANGLING */ #define I2C_M_RECV_LEN 0x0400 /* length will be first received byte */ |
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__u16 len; /* msg length */ __u8 *buf; /* pointer to msg data */ |
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}; /* To determine what functionality is present */ #define I2C_FUNC_I2C 0x00000001 #define I2C_FUNC_10BIT_ADDR 0x00000002 |
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#define I2C_FUNC_PROTOCOL_MANGLING 0x00000004 /* I2C_M_NOSTART etc. */ |
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#define I2C_FUNC_SMBUS_PEC 0x00000008 |
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#define I2C_FUNC_SMBUS_BLOCK_PROC_CALL 0x00008000 /* SMBus 2.0 */ |
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#define I2C_FUNC_SMBUS_QUICK 0x00010000 #define I2C_FUNC_SMBUS_READ_BYTE 0x00020000 #define I2C_FUNC_SMBUS_WRITE_BYTE 0x00040000 #define I2C_FUNC_SMBUS_READ_BYTE_DATA 0x00080000 #define I2C_FUNC_SMBUS_WRITE_BYTE_DATA 0x00100000 #define I2C_FUNC_SMBUS_READ_WORD_DATA 0x00200000 #define I2C_FUNC_SMBUS_WRITE_WORD_DATA 0x00400000 #define I2C_FUNC_SMBUS_PROC_CALL 0x00800000 #define I2C_FUNC_SMBUS_READ_BLOCK_DATA 0x01000000 #define I2C_FUNC_SMBUS_WRITE_BLOCK_DATA 0x02000000 |
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#define I2C_FUNC_SMBUS_READ_I2C_BLOCK 0x04000000 /* I2C-like block xfer */ #define I2C_FUNC_SMBUS_WRITE_I2C_BLOCK 0x08000000 /* w/ 1-byte reg. addr. */ |
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#define I2C_FUNC_SMBUS_BYTE (I2C_FUNC_SMBUS_READ_BYTE | \ I2C_FUNC_SMBUS_WRITE_BYTE) #define I2C_FUNC_SMBUS_BYTE_DATA (I2C_FUNC_SMBUS_READ_BYTE_DATA | \ I2C_FUNC_SMBUS_WRITE_BYTE_DATA) #define I2C_FUNC_SMBUS_WORD_DATA (I2C_FUNC_SMBUS_READ_WORD_DATA | \ I2C_FUNC_SMBUS_WRITE_WORD_DATA) #define I2C_FUNC_SMBUS_BLOCK_DATA (I2C_FUNC_SMBUS_READ_BLOCK_DATA | \ I2C_FUNC_SMBUS_WRITE_BLOCK_DATA) #define I2C_FUNC_SMBUS_I2C_BLOCK (I2C_FUNC_SMBUS_READ_I2C_BLOCK | \ I2C_FUNC_SMBUS_WRITE_I2C_BLOCK) #define I2C_FUNC_SMBUS_EMUL (I2C_FUNC_SMBUS_QUICK | \ I2C_FUNC_SMBUS_BYTE | \ I2C_FUNC_SMBUS_BYTE_DATA | \ I2C_FUNC_SMBUS_WORD_DATA | \ I2C_FUNC_SMBUS_PROC_CALL | \ I2C_FUNC_SMBUS_WRITE_BLOCK_DATA | \ I2C_FUNC_SMBUS_I2C_BLOCK | \ I2C_FUNC_SMBUS_PEC) |
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/* * Data for SMBus Messages |
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*/ |
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#define I2C_SMBUS_BLOCK_MAX 32 /* As specified in SMBus standard */ |
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union i2c_smbus_data { __u8 byte; __u16 word; |
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__u8 block[I2C_SMBUS_BLOCK_MAX + 2]; /* block[0] is used for length */ |
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/* and one more for user-space compatibility */ |
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}; |
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/* i2c_smbus_xfer read or write markers */ |
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#define I2C_SMBUS_READ 1 #define I2C_SMBUS_WRITE 0 |
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/* SMBus transaction types (size parameter in the above functions) |
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Note: these no longer correspond to the (arbitrary) PIIX4 internal codes! */ #define I2C_SMBUS_QUICK 0 #define I2C_SMBUS_BYTE 1 |
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#define I2C_SMBUS_BYTE_DATA 2 |
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#define I2C_SMBUS_WORD_DATA 3 #define I2C_SMBUS_PROC_CALL 4 #define I2C_SMBUS_BLOCK_DATA 5 |
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#define I2C_SMBUS_I2C_BLOCK_BROKEN 6 |
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#define I2C_SMBUS_BLOCK_PROC_CALL 7 /* SMBus 2.0 */ |
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#define I2C_SMBUS_I2C_BLOCK_DATA 8 |
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#endif /* _LINUX_I2C_H */ |