xref: /openbmc/linux/drivers/sbus/char/bbc_i2c.h (revision 878f2774)
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 
8 struct bbc_i2c_client {
9 	struct bbc_i2c_bus		*bp;
10 	struct platform_device		*op;
11 	int				bus;
12 	int				address;
13 };
14 
15 enum fan_action { FAN_SLOWER, FAN_SAME, FAN_FASTER, FAN_FULLBLAST, FAN_STATE_MAX };
16 
17 struct 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 
39 struct 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 
53 struct 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. */
75 extern struct platform_device *bbc_i2c_getdev(struct bbc_i2c_bus *, int);
76 extern struct bbc_i2c_client *bbc_i2c_attach(struct bbc_i2c_bus *bp, struct platform_device *);
77 extern void bbc_i2c_detach(struct bbc_i2c_client *);
78 
79 /* Register read/write.  NOTE: Blocking! */
80 extern int bbc_i2c_writeb(struct bbc_i2c_client *, unsigned char val, int off);
81 extern int bbc_i2c_readb(struct bbc_i2c_client *, unsigned char *byte, int off);
82 extern int bbc_i2c_write_buf(struct bbc_i2c_client *, char *buf, int len, int off);
83 extern int bbc_i2c_read_buf(struct bbc_i2c_client *, char *buf, int len, int off);
84 
85 #endif /* _BBC_I2C_H */
86