platform/msm_shared/include/i2c_qup.h

/* Copyright (c) 2010, Code Aurora Forum. All rights reserved.
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#ifndef  __I2C_QUP__
#define  __I2C_QUP__

/**
 * 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).
 */
struct i2c_msg {
	unsigned short addr;	/* slave address */
	unsigned short flags;
#define I2C_M_TEN           0x0010	/* this is a ten bit chip address */
#define I2C_M_WR            0x0000	/* write data, from master to slave */
#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 */
	unsigned short len;	/* msg length */
	unsigned char *buf;	/* pointer to msg data */
};

struct qup_i2c_dev {
	unsigned int gsbi_base;
	unsigned int qup_base;
	unsigned int gsbi_number;
	int qup_irq;
	int num_irqs;
	struct i2c_msg *msg;
	int pos;
	int cnt;
	int err;
	int mode;
	int clk_ctl;
	int clk_freq;
	int src_clk_freq;
	int one_bit_t;
	int out_fifo_sz;
	int in_fifo_sz;
	int out_blk_sz;
	int in_blk_sz;
	int wr_sz;
	int suspended;
	int clk_state;
};

/* Function Definitions */
struct qup_i2c_dev *qup_i2c_init(uint8_t gsbi_id,
				 unsigned clk_freq, unsigned src_clk_freq);
int qup_i2c_deinit(struct qup_i2c_dev *dev);
int qup_i2c_xfer(struct qup_i2c_dev *dev, struct i2c_msg msgs[], int num);

struct device {
	struct device *parent;
	const char *init_name;	/* initial name of the device */
	void (*release) (struct device * dev);
};

/**
 * enum irqreturn
 * @IRQ_NONE        interrupt was not from this device
 * @IRQ_HANDLED     interrupt was handled by this device
 * @IRQ_WAKE_THREAD handler requests to wake the handler thread
 */
enum irqreturn {
	IRQ_NONE,
	IRQ_HANDLED,
	IRQ_WAKE_THREAD,
	IRQ_FAIL,
};

typedef enum irqreturn irqreturn_t;

#define I2C_SMBUS_BLOCK_MAX 32
union i2c_smbus_data {
	unsigned char byte;
	unsigned short word;
	unsigned char block[I2C_SMBUS_BLOCK_MAX + 2];
};

/*
 * 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;
	unsigned int id;
	unsigned int class;	/* classes to allow probing for */
	const struct i2c_algorithm *algo;	/* the algorithm to access the bus */
	void *algo_data;
	/* data fields that are valid for all devices */
	unsigned int level;	/* nesting level for lockdep */
	int timeout;		/* in jiffies */
	int retries;
	struct device dev;	/* the adapter device */
	int nr;
	char name[48];
};

/*
 * 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 {
	/* If an adapter algorithm can't do I2C-level access, set master_xfer to
	   NULL. If an adapter algorithm can do SMBus access, set smbus_xfer. If
	   set to NULL, the SMBus protocol is simulated using common I2C messages */
	/* master_xfer should return the number of messages successfully processed,
	   or a negative value on error */
	int (*master_xfer) (struct i2c_adapter * adap, struct i2c_msg * msgs,
			    int num);
	int (*smbus_xfer) (struct i2c_adapter * adap, unsigned short addr,
			   unsigned short flags, char read_write,
			   unsigned char command, int size,
			   union i2c_smbus_data * data);

	/* To determine what the adapter supports */
	unsigned int (*functionality) (struct i2c_adapter *);
};

#define EIO         5
#define ENOMEM      12
#define EBUSY       16
#define ENODEV      19
#define ENOSYS      38
#define EPROTONOSUPPORT 93
#define ETIMEDOUT   110

#define FALSE  0
#define TRUE   1

#define USEC_PER_SEC   1000000L

#define IRQF_TRIGGER_NONE   0x00000000
#define IRQF_TRIGGER_RISING 0x00000001
#define IRQF_TRIGGER_FALLING    0x00000002
#define IRQF_TRIGGER_HIGH   0x00000004
#define IRQF_TRIGGER_LOW    0x00000008
#define IRQF_TRIGGER_MASK   (IRQF_TRIGGER_HIGH | IRQF_TRIGGER_LOW | \
        IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING)
#define IRQF_TRIGGER_PROBE  0x00000010

/* To determine what functionality is present */

#define I2C_FUNC_I2C            0x00000001
#define I2C_FUNC_10BIT_ADDR     0x00000002
#define I2C_FUNC_PROTOCOL_MANGLING  0x00000004	/* I2C_M_NOSTART etc. */
#define I2C_FUNC_SMBUS_PEC      0x00000008
#define I2C_FUNC_SMBUS_BLOCK_PROC_CALL  0x00008000	/* SMBus 2.0 */
#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
#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. */

#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)

#endif				/* __I2C_QUP__ */