bbc_i2c.h (2056B)
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 */