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 
9 struct bbc_i2c_client {
10 	struct bbc_i2c_bus		*bp;
11 	struct platform_device		*op;
12 	int				bus;
13 	int				address;
14 };
15 
16 enum fan_action { FAN_SLOWER, FAN_SAME, FAN_FASTER, FAN_FULLBLAST, FAN_STATE_MAX };
17 
18 struct 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 
40 struct 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 
54 struct 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. */
76 extern struct platform_device *bbc_i2c_getdev(struct bbc_i2c_bus *, int);
77 extern struct bbc_i2c_client *bbc_i2c_attach(struct bbc_i2c_bus *bp, struct platform_device *);
78 extern void bbc_i2c_detach(struct bbc_i2c_client *);
79 
80 /* Register read/write.  NOTE: Blocking! */
81 extern int bbc_i2c_writeb(struct bbc_i2c_client *, unsigned char val, int off);
82 extern int bbc_i2c_readb(struct bbc_i2c_client *, unsigned char *byte, int off);
83 extern int bbc_i2c_write_buf(struct bbc_i2c_client *, char *buf, int len, int off);
84 extern int bbc_i2c_read_buf(struct bbc_i2c_client *, char *buf, int len, int off);
85 
86 #endif /* _BBC_I2C_H */
87