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 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 dev_err(&client->dev, "I2C error %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"); 112