1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * rl6347a.c - RL6347A class device shared support |
4 | * |
5 | * Copyright 2015 Realtek Semiconductor Corp. |
6 | * |
7 | * Author: Oder Chiou <oder_chiou@realtek.com> |
8 | */ |
9 | |
10 | #include <linux/module.h> |
11 | #include <linux/i2c.h> |
12 | #include <linux/regmap.h> |
13 | |
14 | #include "rl6347a.h" |
15 | |
16 | int rl6347a_hw_write(void *context, unsigned int reg, unsigned int value) |
17 | { |
18 | struct i2c_client *client = context; |
19 | struct rl6347a_priv *rl6347a = i2c_get_clientdata(client); |
20 | u8 data[4]; |
21 | int ret, i; |
22 | |
23 | /* handle index registers */ |
24 | if (reg <= 0xff) { |
25 | rl6347a_hw_write(context: client, RL6347A_COEF_INDEX, value: reg); |
26 | for (i = 0; i < rl6347a->index_cache_size; i++) { |
27 | if (reg == rl6347a->index_cache[i].reg) { |
28 | rl6347a->index_cache[i].def = value; |
29 | break; |
30 | } |
31 | |
32 | } |
33 | reg = RL6347A_PROC_COEF; |
34 | } |
35 | |
36 | data[0] = (reg >> 24) & 0xff; |
37 | data[1] = (reg >> 16) & 0xff; |
38 | /* |
39 | * 4 bit VID: reg should be 0 |
40 | * 12 bit VID: value should be 0 |
41 | * So we use an OR operator to handle it rather than use if condition. |
42 | */ |
43 | data[2] = ((reg >> 8) & 0xff) | ((value >> 8) & 0xff); |
44 | data[3] = value & 0xff; |
45 | |
46 | ret = i2c_master_send(client, buf: data, count: 4); |
47 | |
48 | if (ret == 4) |
49 | return 0; |
50 | else |
51 | dev_err(&client->dev, "I2C error %d\n" , ret); |
52 | if (ret < 0) |
53 | return ret; |
54 | else |
55 | return -EIO; |
56 | } |
57 | EXPORT_SYMBOL_GPL(rl6347a_hw_write); |
58 | |
59 | int rl6347a_hw_read(void *context, unsigned int reg, unsigned int *value) |
60 | { |
61 | struct i2c_client *client = context; |
62 | struct i2c_msg xfer[2]; |
63 | int ret; |
64 | __be32 be_reg, buf = 0x0; |
65 | unsigned int index, vid; |
66 | |
67 | /* handle index registers */ |
68 | if (reg <= 0xff) { |
69 | rl6347a_hw_write(client, RL6347A_COEF_INDEX, reg); |
70 | reg = RL6347A_PROC_COEF; |
71 | } |
72 | |
73 | reg = reg | 0x80000; |
74 | vid = (reg >> 8) & 0xfff; |
75 | |
76 | if (AC_VERB_GET_AMP_GAIN_MUTE == (vid & 0xf00)) { |
77 | index = (reg >> 8) & 0xf; |
78 | reg = (reg & ~0xf0f) | index; |
79 | } |
80 | be_reg = cpu_to_be32(reg); |
81 | |
82 | /* Write register */ |
83 | xfer[0].addr = client->addr; |
84 | xfer[0].flags = 0; |
85 | xfer[0].len = 4; |
86 | xfer[0].buf = (u8 *)&be_reg; |
87 | |
88 | /* Read data */ |
89 | xfer[1].addr = client->addr; |
90 | xfer[1].flags = I2C_M_RD; |
91 | xfer[1].len = 4; |
92 | xfer[1].buf = (u8 *)&buf; |
93 | |
94 | ret = i2c_transfer(adap: client->adapter, msgs: xfer, num: 2); |
95 | if (ret < 0) |
96 | return ret; |
97 | else if (ret != 2) |
98 | return -EIO; |
99 | |
100 | *value = be32_to_cpu(buf); |
101 | |
102 | return 0; |
103 | } |
104 | EXPORT_SYMBOL_GPL(rl6347a_hw_read); |
105 | |
106 | MODULE_DESCRIPTION("RL6347A class device shared support" ); |
107 | MODULE_AUTHOR("Oder Chiou <oder_chiou@realtek.com>" ); |
108 | MODULE_LICENSE("GPL v2" ); |
109 | |