1 /* 2 * arizona-micsupp.c -- Microphone supply for Arizona devices 3 * 4 * Copyright 2012 Wolfson Microelectronics PLC. 5 * 6 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> 7 * 8 * This program is free software; you can redistribute it and/or modify it 9 * under the terms of the GNU General Public License as published by the 10 * Free Software Foundation; either version 2 of the License, or (at your 11 * option) any later version. 12 */ 13 14 #include <linux/module.h> 15 #include <linux/moduleparam.h> 16 #include <linux/init.h> 17 #include <linux/bitops.h> 18 #include <linux/err.h> 19 #include <linux/platform_device.h> 20 #include <linux/regulator/driver.h> 21 #include <linux/regulator/machine.h> 22 #include <linux/gpio.h> 23 #include <linux/slab.h> 24 #include <linux/workqueue.h> 25 #include <sound/soc.h> 26 27 #include <linux/mfd/arizona/core.h> 28 #include <linux/mfd/arizona/pdata.h> 29 #include <linux/mfd/arizona/registers.h> 30 31 struct arizona_micsupp { 32 struct regulator_dev *regulator; 33 struct arizona *arizona; 34 35 struct regulator_consumer_supply supply; 36 struct regulator_init_data init_data; 37 38 struct work_struct check_cp_work; 39 }; 40 41 static void arizona_micsupp_check_cp(struct work_struct *work) 42 { 43 struct arizona_micsupp *micsupp = 44 container_of(work, struct arizona_micsupp, check_cp_work); 45 struct snd_soc_dapm_context *dapm = micsupp->arizona->dapm; 46 struct arizona *arizona = micsupp->arizona; 47 struct regmap *regmap = arizona->regmap; 48 unsigned int reg; 49 int ret; 50 51 ret = regmap_read(regmap, ARIZONA_MIC_CHARGE_PUMP_1, ®); 52 if (ret != 0) { 53 dev_err(arizona->dev, "Failed to read CP state: %d\n", ret); 54 return; 55 } 56 57 if (dapm) { 58 if ((reg & (ARIZONA_CPMIC_ENA | ARIZONA_CPMIC_BYPASS)) == 59 ARIZONA_CPMIC_ENA) 60 snd_soc_dapm_force_enable_pin(dapm, "MICSUPP"); 61 else 62 snd_soc_dapm_disable_pin(dapm, "MICSUPP"); 63 64 snd_soc_dapm_sync(dapm); 65 } 66 } 67 68 static int arizona_micsupp_enable(struct regulator_dev *rdev) 69 { 70 struct arizona_micsupp *micsupp = rdev_get_drvdata(rdev); 71 int ret; 72 73 ret = regulator_enable_regmap(rdev); 74 75 if (ret == 0) 76 schedule_work(&micsupp->check_cp_work); 77 78 return ret; 79 } 80 81 static int arizona_micsupp_disable(struct regulator_dev *rdev) 82 { 83 struct arizona_micsupp *micsupp = rdev_get_drvdata(rdev); 84 int ret; 85 86 ret = regulator_disable_regmap(rdev); 87 if (ret == 0) 88 schedule_work(&micsupp->check_cp_work); 89 90 return ret; 91 } 92 93 static int arizona_micsupp_set_bypass(struct regulator_dev *rdev, bool ena) 94 { 95 struct arizona_micsupp *micsupp = rdev_get_drvdata(rdev); 96 int ret; 97 98 ret = regulator_set_bypass_regmap(rdev, ena); 99 if (ret == 0) 100 schedule_work(&micsupp->check_cp_work); 101 102 return ret; 103 } 104 105 static struct regulator_ops arizona_micsupp_ops = { 106 .enable = arizona_micsupp_enable, 107 .disable = arizona_micsupp_disable, 108 .is_enabled = regulator_is_enabled_regmap, 109 110 .list_voltage = regulator_list_voltage_linear_range, 111 .map_voltage = regulator_map_voltage_linear_range, 112 113 .get_voltage_sel = regulator_get_voltage_sel_regmap, 114 .set_voltage_sel = regulator_set_voltage_sel_regmap, 115 116 .get_bypass = regulator_get_bypass_regmap, 117 .set_bypass = arizona_micsupp_set_bypass, 118 }; 119 120 static const struct regulator_linear_range arizona_micsupp_ranges[] = { 121 REGULATOR_LINEAR_RANGE(1700000, 0, 0x1e, 50000), 122 REGULATOR_LINEAR_RANGE(3300000, 0x1f, 0x1f, 0), 123 }; 124 125 static const struct regulator_desc arizona_micsupp = { 126 .name = "MICVDD", 127 .supply_name = "CPVDD", 128 .type = REGULATOR_VOLTAGE, 129 .n_voltages = 32, 130 .ops = &arizona_micsupp_ops, 131 132 .vsel_reg = ARIZONA_LDO2_CONTROL_1, 133 .vsel_mask = ARIZONA_LDO2_VSEL_MASK, 134 .enable_reg = ARIZONA_MIC_CHARGE_PUMP_1, 135 .enable_mask = ARIZONA_CPMIC_ENA, 136 .bypass_reg = ARIZONA_MIC_CHARGE_PUMP_1, 137 .bypass_mask = ARIZONA_CPMIC_BYPASS, 138 139 .linear_ranges = arizona_micsupp_ranges, 140 .n_linear_ranges = ARRAY_SIZE(arizona_micsupp_ranges), 141 142 .enable_time = 3000, 143 144 .owner = THIS_MODULE, 145 }; 146 147 static const struct regulator_linear_range arizona_micsupp_ext_ranges[] = { 148 REGULATOR_LINEAR_RANGE(900000, 0, 0x14, 25000), 149 REGULATOR_LINEAR_RANGE(1500000, 0x15, 0x27, 100000), 150 }; 151 152 static const struct regulator_desc arizona_micsupp_ext = { 153 .name = "MICVDD", 154 .supply_name = "CPVDD", 155 .type = REGULATOR_VOLTAGE, 156 .n_voltages = 40, 157 .ops = &arizona_micsupp_ops, 158 159 .vsel_reg = ARIZONA_LDO2_CONTROL_1, 160 .vsel_mask = ARIZONA_LDO2_VSEL_MASK, 161 .enable_reg = ARIZONA_MIC_CHARGE_PUMP_1, 162 .enable_mask = ARIZONA_CPMIC_ENA, 163 .bypass_reg = ARIZONA_MIC_CHARGE_PUMP_1, 164 .bypass_mask = ARIZONA_CPMIC_BYPASS, 165 166 .linear_ranges = arizona_micsupp_ext_ranges, 167 .n_linear_ranges = ARRAY_SIZE(arizona_micsupp_ext_ranges), 168 169 .enable_time = 3000, 170 171 .owner = THIS_MODULE, 172 }; 173 174 static const struct regulator_init_data arizona_micsupp_default = { 175 .constraints = { 176 .valid_ops_mask = REGULATOR_CHANGE_STATUS | 177 REGULATOR_CHANGE_VOLTAGE | 178 REGULATOR_CHANGE_BYPASS, 179 .min_uV = 1700000, 180 .max_uV = 3300000, 181 }, 182 183 .num_consumer_supplies = 1, 184 }; 185 186 static const struct regulator_init_data arizona_micsupp_ext_default = { 187 .constraints = { 188 .valid_ops_mask = REGULATOR_CHANGE_STATUS | 189 REGULATOR_CHANGE_VOLTAGE | 190 REGULATOR_CHANGE_BYPASS, 191 .min_uV = 900000, 192 .max_uV = 3300000, 193 }, 194 195 .num_consumer_supplies = 1, 196 }; 197 198 static int arizona_micsupp_probe(struct platform_device *pdev) 199 { 200 struct arizona *arizona = dev_get_drvdata(pdev->dev.parent); 201 const struct regulator_desc *desc; 202 struct regulator_config config = { }; 203 struct arizona_micsupp *micsupp; 204 int ret; 205 206 micsupp = devm_kzalloc(&pdev->dev, sizeof(*micsupp), GFP_KERNEL); 207 if (!micsupp) 208 return -ENOMEM; 209 210 micsupp->arizona = arizona; 211 INIT_WORK(&micsupp->check_cp_work, arizona_micsupp_check_cp); 212 213 /* 214 * Since the chip usually supplies itself we provide some 215 * default init_data for it. This will be overridden with 216 * platform data if provided. 217 */ 218 switch (arizona->type) { 219 case WM5110: 220 desc = &arizona_micsupp_ext; 221 micsupp->init_data = arizona_micsupp_ext_default; 222 break; 223 default: 224 desc = &arizona_micsupp; 225 micsupp->init_data = arizona_micsupp_default; 226 break; 227 } 228 229 micsupp->init_data.consumer_supplies = &micsupp->supply; 230 micsupp->supply.supply = "MICVDD"; 231 micsupp->supply.dev_name = dev_name(arizona->dev); 232 233 config.dev = arizona->dev; 234 config.driver_data = micsupp; 235 config.regmap = arizona->regmap; 236 237 if (arizona->pdata.micvdd) 238 config.init_data = arizona->pdata.micvdd; 239 else 240 config.init_data = &micsupp->init_data; 241 242 /* Default to regulated mode until the API supports bypass */ 243 regmap_update_bits(arizona->regmap, ARIZONA_MIC_CHARGE_PUMP_1, 244 ARIZONA_CPMIC_BYPASS, 0); 245 246 micsupp->regulator = devm_regulator_register(&pdev->dev, 247 desc, 248 &config); 249 if (IS_ERR(micsupp->regulator)) { 250 ret = PTR_ERR(micsupp->regulator); 251 dev_err(arizona->dev, "Failed to register mic supply: %d\n", 252 ret); 253 return ret; 254 } 255 256 platform_set_drvdata(pdev, micsupp); 257 258 return 0; 259 } 260 261 static struct platform_driver arizona_micsupp_driver = { 262 .probe = arizona_micsupp_probe, 263 .driver = { 264 .name = "arizona-micsupp", 265 .owner = THIS_MODULE, 266 }, 267 }; 268 269 module_platform_driver(arizona_micsupp_driver); 270 271 /* Module information */ 272 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); 273 MODULE_DESCRIPTION("Arizona microphone supply driver"); 274 MODULE_LICENSE("GPL"); 275 MODULE_ALIAS("platform:arizona-micsupp"); 276