1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2 | #ifndef _LINUX_I2C_ALGO_PCA_H |
3 | #define _LINUX_I2C_ALGO_PCA_H |
4 | |
5 | /* Chips known to the pca algo */ |
6 | #define I2C_PCA_CHIP_9564 0x00 |
7 | #define I2C_PCA_CHIP_9665 0x01 |
8 | |
9 | /* Internal period for PCA9665 oscilator */ |
10 | #define I2C_PCA_OSC_PER 3 /* e10-8s */ |
11 | |
12 | /* Clock speeds for the bus for PCA9564*/ |
13 | #define I2C_PCA_CON_330kHz 0x00 |
14 | #define I2C_PCA_CON_288kHz 0x01 |
15 | #define I2C_PCA_CON_217kHz 0x02 |
16 | #define I2C_PCA_CON_146kHz 0x03 |
17 | #define I2C_PCA_CON_88kHz 0x04 |
18 | #define I2C_PCA_CON_59kHz 0x05 |
19 | #define I2C_PCA_CON_44kHz 0x06 |
20 | #define I2C_PCA_CON_36kHz 0x07 |
21 | |
22 | /* PCA9564 registers */ |
23 | #define I2C_PCA_STA 0x00 /* STATUS Read Only */ |
24 | #define I2C_PCA_TO 0x00 /* TIMEOUT Write Only */ |
25 | #define I2C_PCA_DAT 0x01 /* DATA Read/Write */ |
26 | #define I2C_PCA_ADR 0x02 /* OWN ADR Read/Write */ |
27 | #define I2C_PCA_CON 0x03 /* CONTROL Read/Write */ |
28 | |
29 | /* PCA9665 registers */ |
30 | #define I2C_PCA_INDPTR 0x00 /* INDIRECT Pointer Write Only */ |
31 | #define I2C_PCA_IND 0x02 /* INDIRECT Read/Write */ |
32 | |
33 | /* PCA9665 indirect registers */ |
34 | #define I2C_PCA_ICOUNT 0x00 /* Byte Count for buffered mode */ |
35 | #define I2C_PCA_IADR 0x01 /* OWN ADR */ |
36 | #define I2C_PCA_ISCLL 0x02 /* SCL LOW period */ |
37 | #define I2C_PCA_ISCLH 0x03 /* SCL HIGH period */ |
38 | #define I2C_PCA_ITO 0x04 /* TIMEOUT */ |
39 | #define I2C_PCA_IPRESET 0x05 /* Parallel bus reset */ |
40 | #define I2C_PCA_IMODE 0x06 /* I2C Bus mode */ |
41 | |
42 | /* PCA9665 I2C bus mode */ |
43 | #define I2C_PCA_MODE_STD 0x00 /* Standard mode */ |
44 | #define I2C_PCA_MODE_FAST 0x01 /* Fast mode */ |
45 | #define I2C_PCA_MODE_FASTP 0x02 /* Fast Plus mode */ |
46 | #define I2C_PCA_MODE_TURBO 0x03 /* Turbo mode */ |
47 | |
48 | |
49 | #define I2C_PCA_CON_AA 0x80 /* Assert Acknowledge */ |
50 | #define I2C_PCA_CON_ENSIO 0x40 /* Enable */ |
51 | #define I2C_PCA_CON_STA 0x20 /* Start */ |
52 | #define I2C_PCA_CON_STO 0x10 /* Stop */ |
53 | #define I2C_PCA_CON_SI 0x08 /* Serial Interrupt */ |
54 | #define I2C_PCA_CON_CR 0x07 /* Clock Rate (MASK) */ |
55 | |
56 | /** |
57 | * struct pca_i2c_bus_settings - The configured PCA i2c bus settings |
58 | * @mode: Configured i2c bus mode |
59 | * @tlow: Configured SCL LOW period |
60 | * @thi: Configured SCL HIGH period |
61 | * @clock_freq: The configured clock frequency |
62 | */ |
63 | struct pca_i2c_bus_settings { |
64 | int mode; |
65 | int tlow; |
66 | int thi; |
67 | int clock_freq; |
68 | }; |
69 | |
70 | struct i2c_algo_pca_data { |
71 | void *data; /* private low level data */ |
72 | void (*write_byte) (void *data, int reg, int val); |
73 | int (*read_byte) (void *data, int reg); |
74 | int (*wait_for_completion) (void *data); |
75 | void (*reset_chip) (void *data); |
76 | /* For PCA9564, use one of the predefined frequencies: |
77 | * 330000, 288000, 217000, 146000, 88000, 59000, 44000, 36000 |
78 | * For PCA9665, use the frequency you want here. */ |
79 | unsigned int i2c_clock; |
80 | unsigned int chip; |
81 | struct pca_i2c_bus_settings bus_settings; |
82 | }; |
83 | |
84 | int i2c_pca_add_bus(struct i2c_adapter *); |
85 | int i2c_pca_add_numbered_bus(struct i2c_adapter *); |
86 | |
87 | #endif /* _LINUX_I2C_ALGO_PCA_H */ |
88 | |