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#ifndef __I2C_KEYWEST_H__
#define __I2C_KEYWEST_H__

/* The Tumbler audio equalizer can be really slow sometimes */
#define POLL_TIMEOUT            (2*HZ)

/* Register indices */
typedef enum {
        reg_mode = 0,
        reg_control,
        reg_status,
        reg_isr,
        reg_ier,
        reg_addr,
        reg_subaddr,
        reg_data
} reg_t;


/* Mode register */
#define KW_I2C_MODE_100KHZ      0x00
#define KW_I2C_MODE_50KHZ       0x01
#define KW_I2C_MODE_25KHZ       0x02
#define KW_I2C_MODE_DUMB        0x00
#define KW_I2C_MODE_STANDARD    0x04
#define KW_I2C_MODE_STANDARDSUB 0x08
#define KW_I2C_MODE_COMBINED    0x0C
#define KW_I2C_MODE_MODE_MASK   0x0C
#define KW_I2C_MODE_CHAN_MASK   0xF0

/* Control register */
#define KW_I2C_CTL_AAK          0x01
#define KW_I2C_CTL_XADDR        0x02
#define KW_I2C_CTL_STOP         0x04
#define KW_I2C_CTL_START        0x08

/* Status register */
#define KW_I2C_STAT_BUSY        0x01
#define KW_I2C_STAT_LAST_AAK    0x02
#define KW_I2C_STAT_LAST_RW     0x04
#define KW_I2C_STAT_SDA         0x08
#define KW_I2C_STAT_SCL         0x10

/* IER & ISR registers */
#define KW_I2C_IRQ_DATA         0x01
#define KW_I2C_IRQ_ADDR         0x02
#define KW_I2C_IRQ_STOP         0x04
#define KW_I2C_IRQ_START        0x08
#define KW_I2C_IRQ_MASK         0x0F

/* Physical interface */
struct keywest_iface
{
        unsigned long           base;
        unsigned                bsteps;
        int                     irq;
        struct semaphore        sem;
        spinlock_t              lock;
        struct keywest_chan*    channels;
        unsigned                chan_count;
        u8                      cur_mode;
        char                    read_write;
        u8*                     data;
        unsigned                datalen;
        int                     state;
        int                     result;
        int                     stopretry;
        struct timer_list       timeout_timer;
        struct completion       complete;
};

enum {
        state_idle,
        state_addr,
        state_read,
        state_write,
        state_stop,
        state_dead
};

/* Channel on an interface */
struct keywest_chan
{
        struct i2c_adapter      adapter;
        struct keywest_iface*   iface;
        unsigned                chan_no;
};

/* Register access */

static inline u8 __read_reg(struct keywest_iface *iface, reg_t reg)
{
        return in_8(((volatile u8 *)iface->base)
                + (((unsigned)reg) << iface->bsteps));
}

static inline void __write_reg(struct keywest_iface *iface, reg_t reg, u8 val)
{
        out_8(((volatile u8 *)iface->base)
                + (((unsigned)reg) << iface->bsteps), val);
        (void)__read_reg(iface, reg);
        udelay(10);
}

#define write_reg(reg, val)     __write_reg(iface, reg, val)
#define read_reg(reg)           __read_reg(iface, reg)



#endif /* __I2C_KEYWEST_H__ */