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/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 */ 86