Asish Bhattacharya | 8e2277f | 2017-07-20 18:31:55 +0530 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2015-2017, The Linux Foundation. All rights reserved. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License version 2 and |
| 6 | * only version 2 as published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 11 | * GNU General Public License for more details. |
| 12 | */ |
| 13 | |
| 14 | #include <linux/device.h> |
| 15 | #include <linux/slab.h> |
| 16 | #include <linux/mutex.h> |
| 17 | #include <linux/regmap.h> |
Asish Bhattacharya | 8e2277f | 2017-07-20 18:31:55 +0530 | [diff] [blame] | 18 | #include <linux/module.h> |
| 19 | #include <linux/init.h> |
Laxminath Kasam | 605b42f | 2017-08-01 22:02:15 +0530 | [diff] [blame] | 20 | #include <soc/soundwire.h> |
| 21 | #include <soc/internal.h> |
Asish Bhattacharya | 8e2277f | 2017-07-20 18:31:55 +0530 | [diff] [blame] | 22 | |
Asish Bhattacharya | 8e2277f | 2017-07-20 18:31:55 +0530 | [diff] [blame] | 23 | |
| 24 | static int regmap_swr_gather_write(void *context, |
| 25 | const void *reg, size_t reg_size, |
| 26 | const void *val, size_t val_len) |
| 27 | { |
| 28 | struct device *dev = context; |
| 29 | struct swr_device *swr = to_swr_device(dev); |
| 30 | struct regmap *map = dev_get_regmap(dev, NULL); |
| 31 | size_t addr_bytes; |
| 32 | size_t val_bytes; |
| 33 | int i, ret = 0; |
| 34 | u16 reg_addr = 0; |
| 35 | u8 *value; |
| 36 | |
| 37 | if (map == NULL) { |
| 38 | dev_err(dev, "%s: regmap is NULL\n", __func__); |
| 39 | return -EINVAL; |
| 40 | } |
| 41 | addr_bytes = map->format.reg_bytes; |
| 42 | if (swr == NULL) { |
| 43 | dev_err(dev, "%s: swr device is NULL\n", __func__); |
| 44 | return -EINVAL; |
| 45 | } |
| 46 | if (reg_size != addr_bytes) { |
| 47 | dev_err(dev, "%s: reg size %zd bytes not supported\n", |
| 48 | __func__, reg_size); |
| 49 | return -EINVAL; |
| 50 | } |
| 51 | reg_addr = *(u16 *)reg; |
| 52 | val_bytes = map->format.val_bytes; |
| 53 | /* val_len = val_bytes * val_count */ |
| 54 | for (i = 0; i < (val_len / val_bytes); i++) { |
| 55 | value = (u8 *)val + (val_bytes * i); |
| 56 | ret = swr_write(swr, swr->dev_num, (reg_addr + i), value); |
| 57 | if (ret < 0) { |
| 58 | dev_err(dev, "%s: write reg 0x%x failed, err %d\n", |
| 59 | __func__, (reg_addr + i), ret); |
| 60 | break; |
| 61 | } |
| 62 | } |
| 63 | return ret; |
| 64 | } |
| 65 | |
| 66 | static int regmap_swr_raw_multi_reg_write(void *context, const void *data, |
| 67 | size_t count) |
| 68 | { |
| 69 | struct device *dev = context; |
| 70 | struct swr_device *swr = to_swr_device(dev); |
| 71 | struct regmap *map = dev_get_regmap(dev, NULL); |
| 72 | size_t addr_bytes; |
| 73 | size_t val_bytes; |
| 74 | size_t pad_bytes; |
| 75 | size_t num_regs; |
| 76 | int i = 0; |
| 77 | int ret = 0; |
| 78 | u16 *reg; |
| 79 | u8 *val; |
| 80 | u8 *buf; |
| 81 | |
| 82 | if (swr == NULL) { |
| 83 | dev_err(dev, "%s: swr device is NULL\n", __func__); |
| 84 | return -EINVAL; |
| 85 | } |
| 86 | |
| 87 | if (map == NULL) { |
| 88 | dev_err(dev, "%s: regmap is NULL\n", __func__); |
| 89 | return -EINVAL; |
| 90 | } |
| 91 | |
| 92 | addr_bytes = map->format.reg_bytes; |
| 93 | val_bytes = map->format.val_bytes; |
| 94 | pad_bytes = map->format.pad_bytes; |
| 95 | |
| 96 | if (addr_bytes + val_bytes + pad_bytes == 0) { |
| 97 | dev_err(dev, "%s: sum of addr, value and pad is 0\n", __func__); |
| 98 | return -EINVAL; |
| 99 | } |
| 100 | num_regs = count / (addr_bytes + val_bytes + pad_bytes); |
| 101 | |
| 102 | reg = kcalloc(num_regs, sizeof(u16), GFP_KERNEL); |
| 103 | if (!reg) |
| 104 | return -ENOMEM; |
| 105 | |
| 106 | val = kcalloc(num_regs, sizeof(u8), GFP_KERNEL); |
| 107 | if (!val) { |
| 108 | ret = -ENOMEM; |
| 109 | goto mem_fail; |
| 110 | } |
| 111 | |
| 112 | buf = (u8 *)data; |
| 113 | for (i = 0; i < num_regs; i++) { |
| 114 | reg[i] = *(u16 *)buf; |
| 115 | buf += (map->format.reg_bytes + map->format.pad_bytes); |
| 116 | val[i] = *buf; |
| 117 | buf += map->format.val_bytes; |
| 118 | } |
| 119 | ret = swr_bulk_write(swr, swr->dev_num, reg, val, num_regs); |
| 120 | if (ret) |
| 121 | dev_err(dev, "%s: multi reg write failed\n", __func__); |
| 122 | |
| 123 | kfree(val); |
| 124 | mem_fail: |
| 125 | kfree(reg); |
| 126 | return ret; |
| 127 | } |
| 128 | |
| 129 | static int regmap_swr_write(void *context, const void *data, size_t count) |
| 130 | { |
| 131 | struct device *dev = context; |
| 132 | struct regmap *map = dev_get_regmap(dev, NULL); |
| 133 | size_t addr_bytes; |
| 134 | size_t val_bytes; |
| 135 | size_t pad_bytes; |
| 136 | |
| 137 | if (map == NULL) { |
| 138 | dev_err(dev, "%s: regmap is NULL\n", __func__); |
| 139 | return -EINVAL; |
| 140 | } |
| 141 | addr_bytes = map->format.reg_bytes; |
| 142 | val_bytes = map->format.val_bytes; |
| 143 | pad_bytes = map->format.pad_bytes; |
| 144 | |
| 145 | WARN_ON(count < addr_bytes); |
| 146 | |
| 147 | if (count > (addr_bytes + val_bytes + pad_bytes)) |
| 148 | return regmap_swr_raw_multi_reg_write(context, data, count); |
| 149 | else |
| 150 | return regmap_swr_gather_write(context, data, addr_bytes, |
| 151 | (data + addr_bytes), |
| 152 | (count - addr_bytes)); |
| 153 | } |
| 154 | |
| 155 | static int regmap_swr_read(void *context, |
| 156 | const void *reg, size_t reg_size, |
| 157 | void *val, size_t val_size) |
| 158 | { |
| 159 | struct device *dev = context; |
| 160 | struct swr_device *swr = to_swr_device(dev); |
| 161 | struct regmap *map = dev_get_regmap(dev, NULL); |
| 162 | size_t addr_bytes; |
| 163 | int ret = 0; |
| 164 | u16 reg_addr = 0; |
| 165 | |
| 166 | if (map == NULL) { |
| 167 | dev_err(dev, "%s: regmap is NULL\n", __func__); |
| 168 | return -EINVAL; |
| 169 | } |
| 170 | addr_bytes = map->format.reg_bytes; |
| 171 | if (swr == NULL) { |
| 172 | dev_err(dev, "%s: swr is NULL\n", __func__); |
| 173 | return -EINVAL; |
| 174 | } |
| 175 | if (reg_size != addr_bytes) { |
| 176 | dev_err(dev, "%s: register size %zd bytes not supported\n", |
| 177 | __func__, reg_size); |
| 178 | return -EINVAL; |
| 179 | } |
| 180 | reg_addr = *(u16 *)reg; |
| 181 | ret = swr_read(swr, swr->dev_num, reg_addr, val, val_size); |
| 182 | if (ret < 0) |
| 183 | dev_err(dev, "%s: codec reg 0x%x read failed %d\n", |
| 184 | __func__, reg_addr, ret); |
| 185 | return ret; |
| 186 | } |
| 187 | |
| 188 | static struct regmap_bus regmap_swr = { |
| 189 | .write = regmap_swr_write, |
| 190 | .gather_write = regmap_swr_gather_write, |
| 191 | .read = regmap_swr_read, |
| 192 | .reg_format_endian_default = REGMAP_ENDIAN_NATIVE, |
| 193 | .val_format_endian_default = REGMAP_ENDIAN_NATIVE, |
| 194 | }; |
| 195 | |
| 196 | struct regmap *__regmap_init_swr(struct swr_device *swr, |
| 197 | const struct regmap_config *config, |
| 198 | struct lock_class_key *lock_key, |
| 199 | const char *lock_name) |
| 200 | { |
| 201 | return __regmap_init(&swr->dev, ®map_swr, &swr->dev, config, |
| 202 | lock_key, lock_name); |
| 203 | } |
| 204 | EXPORT_SYMBOL(__regmap_init_swr); |
| 205 | |
| 206 | struct regmap *__devm_regmap_init_swr(struct swr_device *swr, |
| 207 | const struct regmap_config *config, |
| 208 | struct lock_class_key *lock_key, |
| 209 | const char *lock_name) |
| 210 | { |
| 211 | return __devm_regmap_init(&swr->dev, ®map_swr, &swr->dev, config, |
| 212 | lock_key, lock_name); |
| 213 | } |
| 214 | EXPORT_SYMBOL(__devm_regmap_init_swr); |
| 215 | |
| 216 | MODULE_LICENSE("GPL v2"); |