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