drivers/sbus/char/bbc_i2c.h

   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 of_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 of_device                *op;
  68         struct {
  69                 struct of_device        *device;
  70                 int                     client_claimed;
  71         } devs[NUM_CHILDREN];
  72 };
  73
  74 /* Probing and attachment. */
  75 extern struct of_device *bbc_i2c_getdev(struct bbc_i2c_bus *, int);
  76 extern struct bbc_i2c_client *bbc_i2c_attach(struct bbc_i2c_bus *bp, struct of_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 */