1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _BBC_I2C_H
3#define _BBC_I2C_H
4
5#include <linux/of.h>
6#include <linux/list.h>
7
8struct bbc_i2c_client {
9	struct bbc_i2c_bus		*bp;
10	struct platform_device		*op;
11	int				bus;
12	int				address;
13};
14
15enum fan_action { FAN_SLOWER, FAN_SAME, FAN_FASTER, FAN_FULLBLAST, FAN_STATE_MAX };
16
17struct bbc_cpu_temperature {
18	struct list_head		bp_list;
19	struct list_head		glob_list;
20
21	struct bbc_i2c_client		*client;
22	int				index;
23
24	/* Current readings, and history. */
25	s8				curr_cpu_temp;
26	s8				curr_amb_temp;
27	s8				prev_cpu_temp;
28	s8				prev_amb_temp;
29	s8				avg_cpu_temp;
30	s8				avg_amb_temp;
31
32	int				sample_tick;
33
34	enum fan_action			fan_todo[2];
35#define FAN_AMBIENT	0
36#define FAN_CPU		1
37};
38
39struct bbc_fan_control {
40	struct list_head		bp_list;
41	struct list_head		glob_list;
42
43	struct bbc_i2c_client 		*client;
44	int 				index;
45
46	int				psupply_fan_on;
47	int				cpu_fan_speed;
48	int				system_fan_speed;
49};
50
51#define NUM_CHILDREN	8
52
53struct bbc_i2c_bus {
54	struct bbc_i2c_bus		*next;
55	int				index;
56	spinlock_t			lock;
57	void				__iomem *i2c_bussel_reg;
58	void				__iomem *i2c_control_regs;
59	unsigned char			own, clock;
60
61	wait_queue_head_t		wq;
62	volatile int			waiting;
63
64	struct list_head		temps;
65	struct list_head		fans;
66
67	struct platform_device		*op;
68	struct {
69		struct platform_device	*device;
70		int			client_claimed;
71	} devs[NUM_CHILDREN];
72};
73
74/* Probing and attachment. */
75extern struct platform_device *bbc_i2c_getdev(struct bbc_i2c_bus *, int);
76extern struct bbc_i2c_client *bbc_i2c_attach(struct bbc_i2c_bus *bp, struct platform_device *);
77extern void bbc_i2c_detach(struct bbc_i2c_client *);
78
79/* Register read/write.  NOTE: Blocking! */
80extern int bbc_i2c_writeb(struct bbc_i2c_client *, unsigned char val, int off);
81extern int bbc_i2c_readb(struct bbc_i2c_client *, unsigned char *byte, int off);
82extern int bbc_i2c_write_buf(struct bbc_i2c_client *, char *buf, int len, int off);
83extern int bbc_i2c_read_buf(struct bbc_i2c_client *, char *buf, int len, int off);
84
85extern int bbc_envctrl_init(struct bbc_i2c_bus *bp);
86extern void bbc_envctrl_cleanup(struct bbc_i2c_bus *bp);
87
88#endif /* _BBC_I2C_H */
89