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kernel add
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#ifndef _BBC_I2C_H
#define _BBC_I2C_H
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/list.h>
struct bbc_i2c_client {
struct bbc_i2c_bus *bp;
struct platform_device *op;
int bus;
int address;
};
enum fan_action { FAN_SLOWER, FAN_SAME, FAN_FASTER, FAN_FULLBLAST, FAN_STATE_MAX };
struct bbc_cpu_temperature {
struct list_head bp_list;
struct list_head glob_list;
struct bbc_i2c_client *client;
int index;
/* Current readings, and history. */
s8 curr_cpu_temp;
s8 curr_amb_temp;
s8 prev_cpu_temp;
s8 prev_amb_temp;
s8 avg_cpu_temp;
s8 avg_amb_temp;
int sample_tick;
enum fan_action fan_todo[2];
#define FAN_AMBIENT 0
#define FAN_CPU 1
};
struct bbc_fan_control {
struct list_head bp_list;
struct list_head glob_list;
struct bbc_i2c_client *client;
int index;
int psupply_fan_on;
int cpu_fan_speed;
int system_fan_speed;
};
#define NUM_CHILDREN 8
struct bbc_i2c_bus {
struct bbc_i2c_bus *next;
int index;
spinlock_t lock;
void __iomem *i2c_bussel_reg;
void __iomem *i2c_control_regs;
unsigned char own, clock;
wait_queue_head_t wq;
volatile int waiting;
struct list_head temps;
struct list_head fans;
struct platform_device *op;
struct {
struct platform_device *device;
int client_claimed;
} devs[NUM_CHILDREN];
};
/* Probing and attachment. */
extern struct platform_device *bbc_i2c_getdev(struct bbc_i2c_bus *, int);
extern struct bbc_i2c_client *bbc_i2c_attach(struct bbc_i2c_bus *bp, struct platform_device *);
extern void bbc_i2c_detach(struct bbc_i2c_client *);
/* Register read/write. NOTE: Blocking! */
extern int bbc_i2c_writeb(struct bbc_i2c_client *, unsigned char val, int off);
extern int bbc_i2c_readb(struct bbc_i2c_client *, unsigned char *byte, int off);
extern int bbc_i2c_write_buf(struct bbc_i2c_client *, char *buf, int len, int off);
extern int bbc_i2c_read_buf(struct bbc_i2c_client *, char *buf, int len, int off);
#endif /* _BBC_I2C_H */
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