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1 | /* |
2 | * rl6347a.c - RL6347A class device shared support | |
3 | * | |
4 | * Copyright 2015 Realtek Semiconductor Corp. | |
5 | * | |
6 | * Author: Oder Chiou <oder_chiou@realtek.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | */ | |
12 | ||
13 | #include <linux/module.h> | |
bc08f96b | 14 | #include <linux/i2c.h> |
0f7e1774 | 15 | #include <linux/regmap.h> |
bc08f96b OC |
16 | |
17 | #include "rl6347a.h" | |
18 | ||
19 | int rl6347a_hw_write(void *context, unsigned int reg, unsigned int value) | |
20 | { | |
21 | struct i2c_client *client = context; | |
22 | struct rl6347a_priv *rl6347a = i2c_get_clientdata(client); | |
23 | u8 data[4]; | |
24 | int ret, i; | |
25 | ||
26 | /* handle index registers */ | |
27 | if (reg <= 0xff) { | |
28 | rl6347a_hw_write(client, RL6347A_COEF_INDEX, reg); | |
29 | for (i = 0; i < rl6347a->index_cache_size; i++) { | |
30 | if (reg == rl6347a->index_cache[i].reg) { | |
31 | rl6347a->index_cache[i].def = value; | |
32 | break; | |
33 | } | |
34 | ||
35 | } | |
36 | reg = RL6347A_PROC_COEF; | |
37 | } | |
38 | ||
39 | data[0] = (reg >> 24) & 0xff; | |
40 | data[1] = (reg >> 16) & 0xff; | |
41 | /* | |
42 | * 4 bit VID: reg should be 0 | |
43 | * 12 bit VID: value should be 0 | |
44 | * So we use an OR operator to handle it rather than use if condition. | |
45 | */ | |
46 | data[2] = ((reg >> 8) & 0xff) | ((value >> 8) & 0xff); | |
47 | data[3] = value & 0xff; | |
48 | ||
49 | ret = i2c_master_send(client, data, 4); | |
50 | ||
51 | if (ret == 4) | |
52 | return 0; | |
53 | else | |
54 | pr_err("ret=%d\n", ret); | |
55 | if (ret < 0) | |
56 | return ret; | |
57 | else | |
58 | return -EIO; | |
59 | } | |
60 | EXPORT_SYMBOL_GPL(rl6347a_hw_write); | |
61 | ||
62 | int rl6347a_hw_read(void *context, unsigned int reg, unsigned int *value) | |
63 | { | |
64 | struct i2c_client *client = context; | |
65 | struct i2c_msg xfer[2]; | |
66 | int ret; | |
67 | __be32 be_reg; | |
68 | unsigned int index, vid, buf = 0x0; | |
69 | ||
70 | /* handle index registers */ | |
71 | if (reg <= 0xff) { | |
72 | rl6347a_hw_write(client, RL6347A_COEF_INDEX, reg); | |
73 | reg = RL6347A_PROC_COEF; | |
74 | } | |
75 | ||
76 | reg = reg | 0x80000; | |
77 | vid = (reg >> 8) & 0xfff; | |
78 | ||
79 | if (AC_VERB_GET_AMP_GAIN_MUTE == (vid & 0xf00)) { | |
80 | index = (reg >> 8) & 0xf; | |
81 | reg = (reg & ~0xf0f) | index; | |
82 | } | |
83 | be_reg = cpu_to_be32(reg); | |
84 | ||
85 | /* Write register */ | |
86 | xfer[0].addr = client->addr; | |
87 | xfer[0].flags = 0; | |
88 | xfer[0].len = 4; | |
89 | xfer[0].buf = (u8 *)&be_reg; | |
90 | ||
91 | /* Read data */ | |
92 | xfer[1].addr = client->addr; | |
93 | xfer[1].flags = I2C_M_RD; | |
94 | xfer[1].len = 4; | |
95 | xfer[1].buf = (u8 *)&buf; | |
96 | ||
97 | ret = i2c_transfer(client->adapter, xfer, 2); | |
98 | if (ret < 0) | |
99 | return ret; | |
100 | else if (ret != 2) | |
101 | return -EIO; | |
102 | ||
103 | *value = be32_to_cpu(buf); | |
104 | ||
105 | return 0; | |
106 | } | |
107 | EXPORT_SYMBOL_GPL(rl6347a_hw_read); | |
108 | ||
109 | MODULE_DESCRIPTION("RL6347A class device shared support"); | |
110 | MODULE_AUTHOR("Oder Chiou <oder_chiou@realtek.com>"); | |
111 | MODULE_LICENSE("GPL v2"); |