LXR linux/drivers/sbus/char/bbc

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