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bbc_i2c.h
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1 #ifndef _BBC_I2C_H
2 #define _BBC_I2C_H
3 
4 #include <linux/of.h>
5 #include <linux/of_device.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 */
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