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
rl6347a_hw_write(void * context,unsigned int reg,unsigned int value)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(client, RL6347A_COEF_INDEX, 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, data, 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
rl6347a_hw_read(void * context,unsigned int reg,unsigned int * value)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(client->adapter, xfer, 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