| Mark Brown | 2285322 | 2014-11-18 19:45:51 +0100 | [diff] [blame^] | 1 | /* |
| 2 | * Register map access API - AC'97 support |
| 3 | * |
| 4 | * Copyright 2013 Linaro Ltd. All rights reserved. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify it |
| 7 | * under the terms and conditions of the GNU General Public License, |
| 8 | * version 2, as published by the Free Software Foundation. |
| 9 | * |
| 10 | * This program is distributed in the hope it will be useful, but WITHOUT |
| 11 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 12 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 13 | * more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 17 | */ |
| 18 | |
| 19 | #include <linux/clk.h> |
| 20 | #include <linux/err.h> |
| 21 | #include <linux/init.h> |
| 22 | #include <linux/io.h> |
| 23 | #include <linux/module.h> |
| 24 | #include <linux/regmap.h> |
| 25 | #include <linux/slab.h> |
| 26 | |
| 27 | #include <sound/ac97_codec.h> |
| 28 | |
| 29 | bool regmap_ac97_default_volatile(struct device *dev, unsigned int reg) |
| 30 | { |
| 31 | switch (reg) { |
| 32 | case AC97_RESET: |
| 33 | case AC97_POWERDOWN: |
| 34 | case AC97_INT_PAGING: |
| 35 | case AC97_EXTENDED_ID: |
| 36 | case AC97_EXTENDED_STATUS: |
| 37 | case AC97_EXTENDED_MID: |
| 38 | case AC97_EXTENDED_MSTATUS: |
| 39 | case AC97_GPIO_STATUS: |
| 40 | case AC97_MISC_AFE: |
| 41 | case AC97_VENDOR_ID1: |
| 42 | case AC97_VENDOR_ID2: |
| 43 | case AC97_CODEC_CLASS_REV: |
| 44 | case AC97_PCI_SVID: |
| 45 | case AC97_PCI_SID: |
| 46 | case AC97_FUNC_SELECT: |
| 47 | case AC97_FUNC_INFO: |
| 48 | case AC97_SENSE_INFO: |
| 49 | return true; |
| 50 | default: |
| 51 | return false; |
| 52 | } |
| 53 | } |
| 54 | EXPORT_SYMBOL_GPL(regmap_ac97_default_volatile); |
| 55 | |
| 56 | static int regmap_ac97_reg_read(void *context, unsigned int reg, |
| 57 | unsigned int *val) |
| 58 | { |
| 59 | struct snd_ac97 *ac97 = context; |
| 60 | |
| 61 | *val = ac97->bus->ops->read(ac97, reg); |
| 62 | |
| 63 | return 0; |
| 64 | } |
| 65 | |
| 66 | static int regmap_ac97_reg_write(void *context, unsigned int reg, |
| 67 | unsigned int val) |
| 68 | { |
| 69 | struct snd_ac97 *ac97 = context; |
| 70 | |
| 71 | ac97->bus->ops->write(ac97, reg, val); |
| 72 | |
| 73 | return 0; |
| 74 | } |
| 75 | |
| 76 | static const struct regmap_bus ac97_regmap_bus = { |
| 77 | .reg_write = regmap_ac97_reg_write, |
| 78 | .reg_read = regmap_ac97_reg_read, |
| 79 | }; |
| 80 | |
| 81 | /** |
| 82 | * regmap_init_ac97(): Initialise AC'97 register map |
| 83 | * |
| 84 | * @ac97: Device that will be interacted with |
| 85 | * @config: Configuration for register map |
| 86 | * |
| 87 | * The return value will be an ERR_PTR() on error or a valid pointer to |
| 88 | * a struct regmap. |
| 89 | */ |
| 90 | struct regmap *regmap_init_ac97(struct snd_ac97 *ac97, |
| 91 | const struct regmap_config *config) |
| 92 | { |
| 93 | return regmap_init(&ac97->dev, &ac97_regmap_bus, ac97, config); |
| 94 | } |
| 95 | EXPORT_SYMBOL_GPL(regmap_init_ac97); |
| 96 | |
| 97 | /** |
| 98 | * devm_regmap_init_ac97(): Initialise AC'97 register map |
| 99 | * |
| 100 | * @ac97: Device that will be interacted with |
| 101 | * @config: Configuration for register map |
| 102 | * |
| 103 | * The return value will be an ERR_PTR() on error or a valid pointer |
| 104 | * to a struct regmap. The regmap will be automatically freed by the |
| 105 | * device management code. |
| 106 | */ |
| 107 | struct regmap *devm_regmap_init_ac97(struct snd_ac97 *ac97, |
| 108 | const struct regmap_config *config) |
| 109 | { |
| 110 | return devm_regmap_init(&ac97->dev, &ac97_regmap_bus, ac97, config); |
| 111 | } |
| 112 | EXPORT_SYMBOL_GPL(devm_regmap_init_ac97); |
| 113 | |
| 114 | MODULE_LICENSE("GPL v2"); |