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| 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 | |
| 25 | #include <linux/mfd/arizona/core.h> |
| 26 | #include <linux/mfd/arizona/pdata.h> |
| 27 | #include <linux/mfd/arizona/registers.h> |
| 28 | |
| 29 | #define ARIZONA_MICSUPP_MAX_SELECTOR 0x1f |
| 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 | |
| 39 | static int arizona_micsupp_list_voltage(struct regulator_dev *rdev, |
| 40 | unsigned int selector) |
| 41 | { |
| 42 | if (selector > ARIZONA_MICSUPP_MAX_SELECTOR) |
| 43 | return -EINVAL; |
| 44 | |
| 45 | if (selector == ARIZONA_MICSUPP_MAX_SELECTOR) |
| 46 | return 3300000; |
| 47 | else |
| 48 | return (selector * 50000) + 1700000; |
| 49 | } |
| 50 | |
| 51 | static int arizona_micsupp_map_voltage(struct regulator_dev *rdev, |
| 52 | int min_uV, int max_uV) |
| 53 | { |
| 54 | unsigned int voltage; |
| 55 | int selector; |
| 56 | |
| 57 | if (min_uV < 1700000) |
| 58 | min_uV = 1700000; |
| 59 | |
| 60 | if (min_uV > 3200000) |
| 61 | selector = ARIZONA_MICSUPP_MAX_SELECTOR; |
| 62 | else |
| 63 | selector = DIV_ROUND_UP(min_uV - 1700000, 50000); |
| 64 | |
| 65 | if (selector < 0) |
| 66 | return -EINVAL; |
| 67 | |
| 68 | voltage = arizona_micsupp_list_voltage(rdev, selector); |
| 69 | if (voltage < min_uV || voltage > max_uV) |
| 70 | return -EINVAL; |
| 71 | |
| 72 | return selector; |
| 73 | } |
| 74 | |
| 75 | static struct regulator_ops arizona_micsupp_ops = { |
| 76 | .enable = regulator_enable_regmap, |
| 77 | .disable = regulator_disable_regmap, |
| 78 | .is_enabled = regulator_is_enabled_regmap, |
| 79 | |
| 80 | .list_voltage = arizona_micsupp_list_voltage, |
| 81 | .map_voltage = arizona_micsupp_map_voltage, |
| 82 | |
| 83 | .get_voltage_sel = regulator_get_voltage_sel_regmap, |
| 84 | .set_voltage_sel = regulator_set_voltage_sel_regmap, |
| 85 | }; |
| 86 | |
| 87 | static const struct regulator_desc arizona_micsupp = { |
| 88 | .name = "MICVDD", |
| 89 | .supply_name = "CPVDD", |
| 90 | .type = REGULATOR_VOLTAGE, |
| 91 | .n_voltages = ARIZONA_MICSUPP_MAX_SELECTOR + 1, |
| 92 | .ops = &arizona_micsupp_ops, |
| 93 | |
| 94 | .vsel_reg = ARIZONA_LDO2_CONTROL_1, |
| 95 | .vsel_mask = ARIZONA_LDO2_VSEL_MASK, |
| 96 | .enable_reg = ARIZONA_MIC_CHARGE_PUMP_1, |
| 97 | .enable_mask = ARIZONA_CPMIC_ENA, |
| 98 | |
| 99 | .owner = THIS_MODULE, |
| 100 | }; |
| 101 | |
| 102 | static const struct regulator_init_data arizona_micsupp_default = { |
| 103 | .constraints = { |
| 104 | .valid_ops_mask = REGULATOR_CHANGE_STATUS | |
| 105 | REGULATOR_CHANGE_VOLTAGE, |
| 106 | .min_uV = 1700000, |
| 107 | .max_uV = 3300000, |
| 108 | }, |
| 109 | |
| 110 | .num_consumer_supplies = 1, |
| 111 | }; |
| 112 | |
| 113 | static __devinit int arizona_micsupp_probe(struct platform_device *pdev) |
| 114 | { |
| 115 | struct arizona *arizona = dev_get_drvdata(pdev->dev.parent); |
| 116 | struct regulator_config config = { }; |
| 117 | struct arizona_micsupp *micsupp; |
| 118 | int ret; |
| 119 | |
| 120 | micsupp = devm_kzalloc(&pdev->dev, sizeof(*micsupp), GFP_KERNEL); |
| 121 | if (micsupp == NULL) { |
| 122 | dev_err(&pdev->dev, "Unable to allocate private data\n"); |
| 123 | return -ENOMEM; |
| 124 | } |
| 125 | |
| 126 | micsupp->arizona = arizona; |
| 127 | |
| 128 | /* |
| 129 | * Since the chip usually supplies itself we provide some |
| 130 | * default init_data for it. This will be overridden with |
| 131 | * platform data if provided. |
| 132 | */ |
| 133 | micsupp->init_data = arizona_micsupp_default; |
| 134 | micsupp->init_data.consumer_supplies = &micsupp->supply; |
| 135 | micsupp->supply.supply = "MICVDD"; |
| 136 | micsupp->supply.dev_name = dev_name(arizona->dev); |
| 137 | |
| 138 | config.dev = arizona->dev; |
| 139 | config.driver_data = micsupp; |
| 140 | config.regmap = arizona->regmap; |
| 141 | |
| 142 | if (arizona->pdata.micvdd) |
| 143 | config.init_data = arizona->pdata.micvdd; |
| 144 | else |
| 145 | config.init_data = &micsupp->init_data; |
| 146 | |
| 147 | /* Default to regulated mode until the API supports bypass */ |
| 148 | regmap_update_bits(arizona->regmap, ARIZONA_MIC_CHARGE_PUMP_1, |
| 149 | ARIZONA_CPMIC_BYPASS, 0); |
| 150 | |
| 151 | micsupp->regulator = regulator_register(&arizona_micsupp, &config); |
| 152 | if (IS_ERR(micsupp->regulator)) { |
| 153 | ret = PTR_ERR(micsupp->regulator); |
| 154 | dev_err(arizona->dev, "Failed to register mic supply: %d\n", |
| 155 | ret); |
| 156 | return ret; |
| 157 | } |
| 158 | |
| 159 | platform_set_drvdata(pdev, micsupp); |
| 160 | |
| 161 | return 0; |
| 162 | } |
| 163 | |
| 164 | static __devexit int arizona_micsupp_remove(struct platform_device *pdev) |
| 165 | { |
| 166 | struct arizona_micsupp *micsupp = platform_get_drvdata(pdev); |
| 167 | |
| 168 | regulator_unregister(micsupp->regulator); |
| 169 | |
| 170 | return 0; |
| 171 | } |
| 172 | |
| 173 | static struct platform_driver arizona_micsupp_driver = { |
| 174 | .probe = arizona_micsupp_probe, |
| 175 | .remove = __devexit_p(arizona_micsupp_remove), |
| 176 | .driver = { |
| 177 | .name = "arizona-micsupp", |
| 178 | .owner = THIS_MODULE, |
| 179 | }, |
| 180 | }; |
| 181 | |
| 182 | module_platform_driver(arizona_micsupp_driver); |
| 183 | |
| 184 | /* Module information */ |
| 185 | MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); |
| 186 | MODULE_DESCRIPTION("Arizona microphone supply driver"); |
| 187 | MODULE_LICENSE("GPL"); |
| 188 | MODULE_ALIAS("platform:arizona-micsupp"); |
| 189 |
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Tags:
od-2011-09-04
od-2011-09-18
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