1 // SPDX-License-Identifier: GPL-2.0 2 // 3 // Register map access API - AC'97 support 4 // 5 // Copyright 2013 Linaro Ltd. All rights reserved. 6 7 #include <linux/clk.h> 8 #include <linux/err.h> 9 #include <linux/init.h> 10 #include <linux/io.h> 11 #include <linux/module.h> 12 #include <linux/regmap.h> 13 #include <linux/slab.h> 14 15 #include <sound/ac97_codec.h> 16 17 bool regmap_ac97_default_volatile(struct device *dev, unsigned int reg) 18 { 19 switch (reg) { 20 case AC97_RESET: 21 case AC97_POWERDOWN: 22 case AC97_INT_PAGING: 23 case AC97_EXTENDED_ID: 24 case AC97_EXTENDED_STATUS: 25 case AC97_EXTENDED_MID: 26 case AC97_EXTENDED_MSTATUS: 27 case AC97_GPIO_STATUS: 28 case AC97_MISC_AFE: 29 case AC97_VENDOR_ID1: 30 case AC97_VENDOR_ID2: 31 case AC97_CODEC_CLASS_REV: 32 case AC97_PCI_SVID: 33 case AC97_PCI_SID: 34 case AC97_FUNC_SELECT: 35 case AC97_FUNC_INFO: 36 case AC97_SENSE_INFO: 37 return true; 38 default: 39 return false; 40 } 41 } 42 EXPORT_SYMBOL_GPL(regmap_ac97_default_volatile); 43 44 static int regmap_ac97_reg_read(void *context, unsigned int reg, 45 unsigned int *val) 46 { 47 struct snd_ac97 *ac97 = context; 48 49 *val = ac97->bus->ops->read(ac97, reg); 50 51 return 0; 52 } 53 54 static int regmap_ac97_reg_write(void *context, unsigned int reg, 55 unsigned int val) 56 { 57 struct snd_ac97 *ac97 = context; 58 59 ac97->bus->ops->write(ac97, reg, val); 60 61 return 0; 62 } 63 64 static const struct regmap_bus ac97_regmap_bus = { 65 .reg_write = regmap_ac97_reg_write, 66 .reg_read = regmap_ac97_reg_read, 67 }; 68 69 struct regmap *__regmap_init_ac97(struct snd_ac97 *ac97, 70 const struct regmap_config *config, 71 struct lock_class_key *lock_key, 72 const char *lock_name) 73 { 74 return __regmap_init(&ac97->dev, &ac97_regmap_bus, ac97, config, 75 lock_key, lock_name); 76 } 77 EXPORT_SYMBOL_GPL(__regmap_init_ac97); 78 79 struct regmap *__devm_regmap_init_ac97(struct snd_ac97 *ac97, 80 const struct regmap_config *config, 81 struct lock_class_key *lock_key, 82 const char *lock_name) 83 { 84 return __devm_regmap_init(&ac97->dev, &ac97_regmap_bus, ac97, config, 85 lock_key, lock_name); 86 } 87 EXPORT_SYMBOL_GPL(__devm_regmap_init_ac97); 88 89 MODULE_DESCRIPTION("Register map access API - AC'97 support"); 90 MODULE_LICENSE("GPL v2"); 91