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| 1 | /* |
| 2 | * arizona-ldo1.c -- LDO1 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 | struct arizona_ldo1 { |
| 30 | struct regulator_dev *regulator; |
| 31 | struct arizona *arizona; |
| 32 | |
| 33 | struct regulator_consumer_supply supply; |
| 34 | struct regulator_init_data init_data; |
| 35 | }; |
| 36 | |
| 37 | static struct regulator_ops arizona_ldo1_ops = { |
| 38 | .list_voltage = regulator_list_voltage_linear, |
| 39 | .map_voltage = regulator_map_voltage_linear, |
| 40 | .get_voltage_sel = regulator_get_voltage_sel_regmap, |
| 41 | .set_voltage_sel = regulator_set_voltage_sel_regmap, |
| 42 | }; |
| 43 | |
| 44 | static const struct regulator_desc arizona_ldo1 = { |
| 45 | .name = "LDO1", |
| 46 | .supply_name = "LDOVDD", |
| 47 | .type = REGULATOR_VOLTAGE, |
| 48 | .ops = &arizona_ldo1_ops, |
| 49 | |
| 50 | .vsel_reg = ARIZONA_LDO1_CONTROL_1, |
| 51 | .vsel_mask = ARIZONA_LDO1_VSEL_MASK, |
| 52 | .min_uV = 900000, |
| 53 | .uV_step = 50000, |
| 54 | .n_voltages = 7, |
| 55 | |
| 56 | .owner = THIS_MODULE, |
| 57 | }; |
| 58 | |
| 59 | static const struct regulator_init_data arizona_ldo1_default = { |
| 60 | .constraints = { |
| 61 | .valid_ops_mask = REGULATOR_CHANGE_STATUS, |
| 62 | }, |
| 63 | .num_consumer_supplies = 1, |
| 64 | }; |
| 65 | |
| 66 | static __devinit int arizona_ldo1_probe(struct platform_device *pdev) |
| 67 | { |
| 68 | struct arizona *arizona = dev_get_drvdata(pdev->dev.parent); |
| 69 | struct regulator_config config = { }; |
| 70 | struct arizona_ldo1 *ldo1; |
| 71 | int ret; |
| 72 | |
| 73 | ldo1 = devm_kzalloc(&pdev->dev, sizeof(*ldo1), GFP_KERNEL); |
| 74 | if (ldo1 == NULL) { |
| 75 | dev_err(&pdev->dev, "Unable to allocate private data\n"); |
| 76 | return -ENOMEM; |
| 77 | } |
| 78 | |
| 79 | ldo1->arizona = arizona; |
| 80 | |
| 81 | /* |
| 82 | * Since the chip usually supplies itself we provide some |
| 83 | * default init_data for it. This will be overridden with |
| 84 | * platform data if provided. |
| 85 | */ |
| 86 | ldo1->init_data = arizona_ldo1_default; |
| 87 | ldo1->init_data.consumer_supplies = &ldo1->supply; |
| 88 | ldo1->supply.supply = "DCVDD"; |
| 89 | ldo1->supply.dev_name = dev_name(arizona->dev); |
| 90 | |
| 91 | config.dev = arizona->dev; |
| 92 | config.driver_data = ldo1; |
| 93 | config.regmap = arizona->regmap; |
| 94 | config.ena_gpio = arizona->pdata.ldoena; |
| 95 | |
| 96 | if (arizona->pdata.ldo1) |
| 97 | config.init_data = arizona->pdata.ldo1; |
| 98 | else |
| 99 | config.init_data = &ldo1->init_data; |
| 100 | |
| 101 | ldo1->regulator = regulator_register(&arizona_ldo1, &config); |
| 102 | if (IS_ERR(ldo1->regulator)) { |
| 103 | ret = PTR_ERR(ldo1->regulator); |
| 104 | dev_err(arizona->dev, "Failed to register LDO1 supply: %d\n", |
| 105 | ret); |
| 106 | return ret; |
| 107 | } |
| 108 | |
| 109 | platform_set_drvdata(pdev, ldo1); |
| 110 | |
| 111 | return 0; |
| 112 | } |
| 113 | |
| 114 | static __devexit int arizona_ldo1_remove(struct platform_device *pdev) |
| 115 | { |
| 116 | struct arizona_ldo1 *ldo1 = platform_get_drvdata(pdev); |
| 117 | |
| 118 | regulator_unregister(ldo1->regulator); |
| 119 | |
| 120 | return 0; |
| 121 | } |
| 122 | |
| 123 | static struct platform_driver arizona_ldo1_driver = { |
| 124 | .probe = arizona_ldo1_probe, |
| 125 | .remove = __devexit_p(arizona_ldo1_remove), |
| 126 | .driver = { |
| 127 | .name = "arizona-ldo1", |
| 128 | .owner = THIS_MODULE, |
| 129 | }, |
| 130 | }; |
| 131 | |
| 132 | module_platform_driver(arizona_ldo1_driver); |
| 133 | |
| 134 | /* Module information */ |
| 135 | MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); |
| 136 | MODULE_DESCRIPTION("Arizona LDO1 driver"); |
| 137 | MODULE_LICENSE("GPL"); |
| 138 | MODULE_ALIAS("platform:arizona-ldo1"); |
| 139 |
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