/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _BBC_I2C_H
#define _BBC_I2C_H

#include <linux/of.h>
#include <linux/list.h>

struct bbc_i2c_client {
        struct bbc_i2c_bus              *bp;
        struct platform_device          *op;
        int                             bus;
        int                             address;
};

enum fan_action { FAN_SLOWER, FAN_SAME, FAN_FASTER, FAN_FULLBLAST, FAN_STATE_MAX };

struct bbc_cpu_temperature {
        struct list_head                bp_list;
        struct list_head                glob_list;

        struct bbc_i2c_client           *client;
        int                             index;

        /* Current readings, and history. */
        s8                              curr_cpu_temp;
        s8                              curr_amb_temp;
        s8                              prev_cpu_temp;
        s8                              prev_amb_temp;
        s8                              avg_cpu_temp;
        s8                              avg_amb_temp;

        int                             sample_tick;

        enum fan_action                 fan_todo[2];
#define FAN_AMBIENT     0
#define FAN_CPU         1
};

struct bbc_fan_control {
        struct list_head                bp_list;
        struct list_head                glob_list;

        struct bbc_i2c_client           *client;
        int                             index;

        int                             psupply_fan_on;
        int                             cpu_fan_speed;
        int                             system_fan_speed;
};

#define NUM_CHILDREN    8

struct bbc_i2c_bus {
        struct bbc_i2c_bus              *next;
        int                             index;
        spinlock_t                      lock;
        void                            __iomem *i2c_bussel_reg;
        void                            __iomem *i2c_control_regs;
        unsigned char                   own, clock;

        wait_queue_head_t               wq;
        volatile int                    waiting;

        struct list_head                temps;
        struct list_head                fans;

        struct platform_device          *op;
        struct {
                struct platform_device  *device;
                int                     client_claimed;
        } devs[NUM_CHILDREN];
};

/* Probing and attachment. */
extern struct platform_device *bbc_i2c_getdev(struct bbc_i2c_bus *, int);
extern struct bbc_i2c_client *bbc_i2c_attach(struct bbc_i2c_bus *bp, struct platform_device *);
extern void bbc_i2c_detach(struct bbc_i2c_client *);

/* Register read/write.  NOTE: Blocking! */
extern int bbc_i2c_writeb(struct bbc_i2c_client *, unsigned char val, int off);
extern int bbc_i2c_readb(struct bbc_i2c_client *, unsigned char *byte, int off);
extern int bbc_i2c_write_buf(struct bbc_i2c_client *, char *buf, int len, int off);
extern int bbc_i2c_read_buf(struct bbc_i2c_client *, char *buf, int len, int off);

extern int bbc_envctrl_init(struct bbc_i2c_bus *bp);
extern void bbc_envctrl_cleanup(struct bbc_i2c_bus *bp);

#endif /* _BBC_I2C_H */