tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1#ifndef __I2C_KEYWEST_H__
2#define __I2C_KEYWEST_H__
3
4/* The Tumbler audio equalizer can be really slow sometimes */
5#define POLL_TIMEOUT (2*HZ)
6
7/* Register indices */
8typedef enum {
9 reg_mode = 0,
10 reg_control,
11 reg_status,
12 reg_isr,
13 reg_ier,
14 reg_addr,
15 reg_subaddr,
16 reg_data
17} reg_t;
18
19
20/* Mode register */
21#define KW_I2C_MODE_100KHZ 0x00
22#define KW_I2C_MODE_50KHZ 0x01
23#define KW_I2C_MODE_25KHZ 0x02
24#define KW_I2C_MODE_DUMB 0x00
25#define KW_I2C_MODE_STANDARD 0x04
26#define KW_I2C_MODE_STANDARDSUB 0x08
27#define KW_I2C_MODE_COMBINED 0x0C
28#define KW_I2C_MODE_MODE_MASK 0x0C
29#define KW_I2C_MODE_CHAN_MASK 0xF0
30
31/* Control register */
32#define KW_I2C_CTL_AAK 0x01
33#define KW_I2C_CTL_XADDR 0x02
34#define KW_I2C_CTL_STOP 0x04
35#define KW_I2C_CTL_START 0x08
36
37/* Status register */
38#define KW_I2C_STAT_BUSY 0x01
39#define KW_I2C_STAT_LAST_AAK 0x02
40#define KW_I2C_STAT_LAST_RW 0x04
41#define KW_I2C_STAT_SDA 0x08
42#define KW_I2C_STAT_SCL 0x10
43
44/* IER & ISR registers */
45#define KW_I2C_IRQ_DATA 0x01
46#define KW_I2C_IRQ_ADDR 0x02
47#define KW_I2C_IRQ_STOP 0x04
48#define KW_I2C_IRQ_START 0x08
49#define KW_I2C_IRQ_MASK 0x0F
50
51/* Physical interface */
52struct keywest_iface
53{
54 struct device_node *node;
55 void __iomem * base;
56 unsigned bsteps;
57 int irq;
58 spinlock_t lock;
59 struct keywest_chan *channels;
60 unsigned chan_count;
61 u8 cur_mode;
62 char read_write;
63 u8 *data;
64 unsigned datalen;
65 int state;
66 int result;
67 struct timer_list timeout_timer;
68 struct completion complete;
69};
70
71enum {
72 state_idle,
73 state_addr,
74 state_read,
75 state_write,
76 state_stop,
77 state_dead
78};
79
80/* Channel on an interface */
81struct keywest_chan
82{
83 struct i2c_adapter adapter;
84 struct keywest_iface* iface;
85 unsigned chan_no;
86};
87
88/* Register access */
89
90static inline u8 __read_reg(struct keywest_iface *iface, reg_t reg)
91{
92 return in_8(iface->base
93 + (((unsigned)reg) << iface->bsteps));
94}
95
96static inline void __write_reg(struct keywest_iface *iface, reg_t reg, u8 val)
97{
98 out_8(iface->base
99 + (((unsigned)reg) << iface->bsteps), val);
100 (void)__read_reg(iface, reg_subaddr);
101}
102
103#define write_reg(reg, val) __write_reg(iface, reg, val)
104#define read_reg(reg) __read_reg(iface, reg)
105
106
107
108#endif /* __I2C_KEYWEST_H__ */