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>
14 #include <linux/i2c.h>
15 #include <linux/regmap.h>
16
17 #include "rl6347a.h"
18
rl6347a_hw_write(void * context,unsigned int reg,unsigned int value)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
rl6347a_hw_read(void * context,unsigned int reg,unsigned int * value)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");
112