| 1 | // SPDX-License-Identifier: GPL-2.0+ |
| 2 | // |
| 3 | // wm8994-regulator.c -- Regulator driver for the WM8994 |
| 4 | // |
| 5 | // Copyright 2009 Wolfson Microelectronics PLC. |
| 6 | // |
| 7 | // Author: Mark Brown <broonie@opensource.wolfsonmicro.com> |
| 8 | |
| 9 | #include <linux/module.h> |
| 10 | #include <linux/moduleparam.h> |
| 11 | #include <linux/init.h> |
| 12 | #include <linux/bitops.h> |
| 13 | #include <linux/err.h> |
| 14 | #include <linux/platform_device.h> |
| 15 | #include <linux/regulator/driver.h> |
| 16 | #include <linux/regulator/machine.h> |
| 17 | #include <linux/gpio/consumer.h> |
| 18 | #include <linux/slab.h> |
| 19 | |
| 20 | #include <linux/mfd/wm8994/core.h> |
| 21 | #include <linux/mfd/wm8994/registers.h> |
| 22 | #include <linux/mfd/wm8994/pdata.h> |
| 23 | |
| 24 | struct wm8994_ldo { |
| 25 | struct regulator_dev *regulator; |
| 26 | struct wm8994 *wm8994; |
| 27 | struct regulator_consumer_supply supply; |
| 28 | struct regulator_init_data init_data; |
| 29 | }; |
| 30 | |
| 31 | #define WM8994_LDO1_MAX_SELECTOR 0x7 |
| 32 | #define WM8994_LDO2_MAX_SELECTOR 0x3 |
| 33 | |
| 34 | static const struct regulator_ops wm8994_ldo1_ops = { |
| 35 | .list_voltage = regulator_list_voltage_linear, |
| 36 | .map_voltage = regulator_map_voltage_linear, |
| 37 | .get_voltage_sel = regulator_get_voltage_sel_regmap, |
| 38 | .set_voltage_sel = regulator_set_voltage_sel_regmap, |
| 39 | }; |
| 40 | |
| 41 | static int wm8994_ldo2_list_voltage(struct regulator_dev *rdev, |
| 42 | unsigned int selector) |
| 43 | { |
| 44 | struct wm8994_ldo *ldo = rdev_get_drvdata(rdev); |
| 45 | |
| 46 | if (selector > WM8994_LDO2_MAX_SELECTOR) |
| 47 | return -EINVAL; |
| 48 | |
| 49 | switch (ldo->wm8994->type) { |
| 50 | case WM8994: |
| 51 | return (selector * 100000) + 900000; |
| 52 | case WM8958: |
| 53 | return (selector * 100000) + 1000000; |
| 54 | case WM1811: |
| 55 | switch (selector) { |
| 56 | case 0: |
| 57 | return -EINVAL; |
| 58 | default: |
| 59 | return (selector * 100000) + 950000; |
| 60 | } |
| 61 | break; |
| 62 | default: |
| 63 | return -EINVAL; |
| 64 | } |
| 65 | } |
| 66 | |
| 67 | static const struct regulator_ops wm8994_ldo2_ops = { |
| 68 | .list_voltage = wm8994_ldo2_list_voltage, |
| 69 | .get_voltage_sel = regulator_get_voltage_sel_regmap, |
| 70 | .set_voltage_sel = regulator_set_voltage_sel_regmap, |
| 71 | }; |
| 72 | |
| 73 | static const struct regulator_desc wm8994_ldo_desc[] = { |
| 74 | { |
| 75 | .name = "LDO1", |
| 76 | .id = 1, |
| 77 | .type = REGULATOR_VOLTAGE, |
| 78 | .n_voltages = WM8994_LDO1_MAX_SELECTOR + 1, |
| 79 | .vsel_reg = WM8994_LDO_1, |
| 80 | .vsel_mask = WM8994_LDO1_VSEL_MASK, |
| 81 | .ops = &wm8994_ldo1_ops, |
| 82 | .min_uV = 2400000, |
| 83 | .uV_step = 100000, |
| 84 | .enable_time = 3000, |
| 85 | .off_on_delay = 36000, |
| 86 | .owner = THIS_MODULE, |
| 87 | }, |
| 88 | { |
| 89 | .name = "LDO2", |
| 90 | .id = 2, |
| 91 | .type = REGULATOR_VOLTAGE, |
| 92 | .n_voltages = WM8994_LDO2_MAX_SELECTOR + 1, |
| 93 | .vsel_reg = WM8994_LDO_2, |
| 94 | .vsel_mask = WM8994_LDO2_VSEL_MASK, |
| 95 | .ops = &wm8994_ldo2_ops, |
| 96 | .enable_time = 3000, |
| 97 | .off_on_delay = 36000, |
| 98 | .owner = THIS_MODULE, |
| 99 | }, |
| 100 | }; |
| 101 | |
| 102 | static const struct regulator_desc wm8958_ldo_desc[] = { |
| 103 | { |
| 104 | .name = "LDO1", |
| 105 | .id = 1, |
| 106 | .type = REGULATOR_VOLTAGE, |
| 107 | .n_voltages = WM8994_LDO1_MAX_SELECTOR + 1, |
| 108 | .vsel_reg = WM8994_LDO_1, |
| 109 | .vsel_mask = WM8994_LDO1_VSEL_MASK, |
| 110 | .ops = &wm8994_ldo1_ops, |
| 111 | .min_uV = 2400000, |
| 112 | .uV_step = 100000, |
| 113 | .enable_time = 3000, |
| 114 | .owner = THIS_MODULE, |
| 115 | }, |
| 116 | { |
| 117 | .name = "LDO2", |
| 118 | .id = 2, |
| 119 | .type = REGULATOR_VOLTAGE, |
| 120 | .n_voltages = WM8994_LDO2_MAX_SELECTOR + 1, |
| 121 | .vsel_reg = WM8994_LDO_2, |
| 122 | .vsel_mask = WM8994_LDO2_VSEL_MASK, |
| 123 | .ops = &wm8994_ldo2_ops, |
| 124 | .enable_time = 3000, |
| 125 | .owner = THIS_MODULE, |
| 126 | }, |
| 127 | }; |
| 128 | |
| 129 | static const struct regulator_consumer_supply wm8994_ldo_consumer[] = { |
| 130 | { .supply = "AVDD1" }, |
| 131 | { .supply = "DCVDD" }, |
| 132 | }; |
| 133 | |
| 134 | static const struct regulator_init_data wm8994_ldo_default[] = { |
| 135 | { |
| 136 | .constraints = { |
| 137 | .valid_ops_mask = REGULATOR_CHANGE_STATUS, |
| 138 | }, |
| 139 | .num_consumer_supplies = 1, |
| 140 | }, |
| 141 | { |
| 142 | .constraints = { |
| 143 | .valid_ops_mask = REGULATOR_CHANGE_STATUS, |
| 144 | }, |
| 145 | .num_consumer_supplies = 1, |
| 146 | }, |
| 147 | }; |
| 148 | |
| 149 | static int wm8994_ldo_probe(struct platform_device *pdev) |
| 150 | { |
| 151 | struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent); |
| 152 | struct wm8994_pdata *pdata = dev_get_platdata(wm8994->dev); |
| 153 | int id = pdev->id % ARRAY_SIZE(pdata->ldo); |
| 154 | struct regulator_config config = { }; |
| 155 | struct wm8994_ldo *ldo; |
| 156 | struct gpio_desc *gpiod; |
| 157 | int ret; |
| 158 | |
| 159 | dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1); |
| 160 | |
| 161 | ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm8994_ldo), GFP_KERNEL); |
| 162 | if (!ldo) |
| 163 | return -ENOMEM; |
| 164 | |
| 165 | ldo->wm8994 = wm8994; |
| 166 | ldo->supply = wm8994_ldo_consumer[id]; |
| 167 | ldo->supply.dev_name = dev_name(wm8994->dev); |
| 168 | |
| 169 | config.dev = wm8994->dev; |
| 170 | config.driver_data = ldo; |
| 171 | config.regmap = wm8994->regmap; |
| 172 | config.init_data = &ldo->init_data; |
| 173 | |
| 174 | /* |
| 175 | * Look up LDO enable GPIO from the parent device node, we don't |
| 176 | * use devm because the regulator core will free the GPIO |
| 177 | */ |
| 178 | gpiod = gpiod_get_optional(pdev->dev.parent, |
| 179 | id ? "wlf,ldo2ena" : "wlf,ldo1ena", |
| 180 | GPIOD_OUT_LOW | |
| 181 | GPIOD_FLAGS_BIT_NONEXCLUSIVE); |
| 182 | if (IS_ERR(gpiod)) |
| 183 | return PTR_ERR(gpiod); |
| 184 | config.ena_gpiod = gpiod; |
| 185 | |
| 186 | /* Use default constraints if none set up */ |
| 187 | if (!pdata || !pdata->ldo[id].init_data || wm8994->dev->of_node) { |
| 188 | dev_dbg(wm8994->dev, "Using default init data, supply %s %s\n", |
| 189 | ldo->supply.dev_name, ldo->supply.supply); |
| 190 | |
| 191 | ldo->init_data = wm8994_ldo_default[id]; |
| 192 | ldo->init_data.consumer_supplies = &ldo->supply; |
| 193 | if (!gpiod) |
| 194 | ldo->init_data.constraints.valid_ops_mask = 0; |
| 195 | } else { |
| 196 | ldo->init_data = *pdata->ldo[id].init_data; |
| 197 | } |
| 198 | |
| 199 | /* |
| 200 | * At this point the GPIO descriptor is handled over to the |
| 201 | * regulator core and we need not worry about it on the |
| 202 | * error path. |
| 203 | */ |
| 204 | if (ldo->wm8994->type == WM8994) { |
| 205 | ldo->regulator = devm_regulator_register(&pdev->dev, |
| 206 | &wm8994_ldo_desc[id], |
| 207 | &config); |
| 208 | } else { |
| 209 | ldo->regulator = devm_regulator_register(&pdev->dev, |
| 210 | &wm8958_ldo_desc[id], |
| 211 | &config); |
| 212 | } |
| 213 | |
| 214 | if (IS_ERR(ldo->regulator)) { |
| 215 | ret = PTR_ERR(ldo->regulator); |
| 216 | dev_err(wm8994->dev, "Failed to register LDO%d: %d\n", |
| 217 | id + 1, ret); |
| 218 | return ret; |
| 219 | } |
| 220 | |
| 221 | platform_set_drvdata(pdev, ldo); |
| 222 | |
| 223 | return 0; |
| 224 | } |
| 225 | |
| 226 | static struct platform_driver wm8994_ldo_driver = { |
| 227 | .probe = wm8994_ldo_probe, |
| 228 | .driver = { |
| 229 | .name = "wm8994-ldo", |
| 230 | .probe_type = PROBE_FORCE_SYNCHRONOUS, |
| 231 | }, |
| 232 | }; |
| 233 | |
| 234 | module_platform_driver(wm8994_ldo_driver); |
| 235 | |
| 236 | /* Module information */ |
| 237 | MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); |
| 238 | MODULE_DESCRIPTION("WM8994 LDO driver"); |
| 239 | MODULE_LICENSE("GPL"); |
| 240 | MODULE_ALIAS("platform:wm8994-ldo"); |