drivers/sbus/char/bbc_i2c.h

   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 */