Mark Brown | d4d6b72 | 2009-07-28 15:23:46 +0100 | [diff] [blame] | 1 | /* |
| 2 | * wm831x-isink.c -- Current sink driver for the WM831x series |
| 3 | * |
| 4 | * Copyright 2009 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/i2c.h> |
| 20 | #include <linux/platform_device.h> |
| 21 | #include <linux/regulator/driver.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 22 | #include <linux/slab.h> |
Mark Brown | d4d6b72 | 2009-07-28 15:23:46 +0100 | [diff] [blame] | 23 | |
| 24 | #include <linux/mfd/wm831x/core.h> |
| 25 | #include <linux/mfd/wm831x/regulator.h> |
| 26 | #include <linux/mfd/wm831x/pdata.h> |
| 27 | |
| 28 | #define WM831X_ISINK_MAX_NAME 7 |
| 29 | |
| 30 | struct wm831x_isink { |
| 31 | char name[WM831X_ISINK_MAX_NAME]; |
| 32 | struct regulator_desc desc; |
| 33 | int reg; |
| 34 | struct wm831x *wm831x; |
| 35 | struct regulator_dev *regulator; |
| 36 | }; |
| 37 | |
| 38 | static int wm831x_isink_enable(struct regulator_dev *rdev) |
| 39 | { |
| 40 | struct wm831x_isink *isink = rdev_get_drvdata(rdev); |
| 41 | struct wm831x *wm831x = isink->wm831x; |
| 42 | int ret; |
| 43 | |
| 44 | /* We have a two stage enable: first start the ISINK... */ |
| 45 | ret = wm831x_set_bits(wm831x, isink->reg, WM831X_CS1_ENA, |
| 46 | WM831X_CS1_ENA); |
| 47 | if (ret != 0) |
| 48 | return ret; |
| 49 | |
| 50 | /* ...then enable drive */ |
| 51 | ret = wm831x_set_bits(wm831x, isink->reg, WM831X_CS1_DRIVE, |
| 52 | WM831X_CS1_DRIVE); |
| 53 | if (ret != 0) |
| 54 | wm831x_set_bits(wm831x, isink->reg, WM831X_CS1_ENA, 0); |
| 55 | |
| 56 | return ret; |
| 57 | |
| 58 | } |
| 59 | |
| 60 | static int wm831x_isink_disable(struct regulator_dev *rdev) |
| 61 | { |
| 62 | struct wm831x_isink *isink = rdev_get_drvdata(rdev); |
| 63 | struct wm831x *wm831x = isink->wm831x; |
| 64 | int ret; |
| 65 | |
| 66 | ret = wm831x_set_bits(wm831x, isink->reg, WM831X_CS1_DRIVE, 0); |
| 67 | if (ret < 0) |
| 68 | return ret; |
| 69 | |
| 70 | ret = wm831x_set_bits(wm831x, isink->reg, WM831X_CS1_ENA, 0); |
| 71 | if (ret < 0) |
| 72 | return ret; |
| 73 | |
| 74 | return ret; |
| 75 | |
| 76 | } |
| 77 | |
| 78 | static int wm831x_isink_is_enabled(struct regulator_dev *rdev) |
| 79 | { |
| 80 | struct wm831x_isink *isink = rdev_get_drvdata(rdev); |
| 81 | struct wm831x *wm831x = isink->wm831x; |
| 82 | int ret; |
| 83 | |
| 84 | ret = wm831x_reg_read(wm831x, isink->reg); |
| 85 | if (ret < 0) |
| 86 | return ret; |
| 87 | |
| 88 | if ((ret & (WM831X_CS1_ENA | WM831X_CS1_DRIVE)) == |
| 89 | (WM831X_CS1_ENA | WM831X_CS1_DRIVE)) |
| 90 | return 1; |
| 91 | else |
| 92 | return 0; |
| 93 | } |
| 94 | |
| 95 | static int wm831x_isink_set_current(struct regulator_dev *rdev, |
| 96 | int min_uA, int max_uA) |
| 97 | { |
| 98 | struct wm831x_isink *isink = rdev_get_drvdata(rdev); |
| 99 | struct wm831x *wm831x = isink->wm831x; |
| 100 | int ret, i; |
| 101 | |
| 102 | for (i = 0; i < ARRAY_SIZE(wm831x_isinkv_values); i++) { |
| 103 | int val = wm831x_isinkv_values[i]; |
| 104 | if (min_uA >= val && val <= max_uA) { |
| 105 | ret = wm831x_set_bits(wm831x, isink->reg, |
| 106 | WM831X_CS1_ISEL_MASK, i); |
| 107 | return ret; |
| 108 | } |
| 109 | } |
| 110 | |
| 111 | return -EINVAL; |
| 112 | } |
| 113 | |
| 114 | static int wm831x_isink_get_current(struct regulator_dev *rdev) |
| 115 | { |
| 116 | struct wm831x_isink *isink = rdev_get_drvdata(rdev); |
| 117 | struct wm831x *wm831x = isink->wm831x; |
| 118 | int ret; |
| 119 | |
| 120 | ret = wm831x_reg_read(wm831x, isink->reg); |
| 121 | if (ret < 0) |
| 122 | return ret; |
| 123 | |
| 124 | ret &= WM831X_CS1_ISEL_MASK; |
| 125 | if (ret > WM831X_ISINK_MAX_ISEL) |
| 126 | ret = WM831X_ISINK_MAX_ISEL; |
| 127 | |
| 128 | return wm831x_isinkv_values[ret]; |
| 129 | } |
| 130 | |
| 131 | static struct regulator_ops wm831x_isink_ops = { |
| 132 | .is_enabled = wm831x_isink_is_enabled, |
| 133 | .enable = wm831x_isink_enable, |
| 134 | .disable = wm831x_isink_disable, |
| 135 | .set_current_limit = wm831x_isink_set_current, |
| 136 | .get_current_limit = wm831x_isink_get_current, |
| 137 | }; |
| 138 | |
| 139 | static irqreturn_t wm831x_isink_irq(int irq, void *data) |
| 140 | { |
| 141 | struct wm831x_isink *isink = data; |
| 142 | |
| 143 | regulator_notifier_call_chain(isink->regulator, |
| 144 | REGULATOR_EVENT_OVER_CURRENT, |
| 145 | NULL); |
| 146 | |
| 147 | return IRQ_HANDLED; |
| 148 | } |
| 149 | |
| 150 | |
| 151 | static __devinit int wm831x_isink_probe(struct platform_device *pdev) |
| 152 | { |
| 153 | struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); |
| 154 | struct wm831x_pdata *pdata = wm831x->dev->platform_data; |
| 155 | struct wm831x_isink *isink; |
| 156 | int id = pdev->id % ARRAY_SIZE(pdata->isink); |
| 157 | struct resource *res; |
| 158 | int ret, irq; |
| 159 | |
| 160 | dev_dbg(&pdev->dev, "Probing ISINK%d\n", id + 1); |
| 161 | |
| 162 | if (pdata == NULL || pdata->isink[id] == NULL) |
| 163 | return -ENODEV; |
| 164 | |
| 165 | isink = kzalloc(sizeof(struct wm831x_isink), GFP_KERNEL); |
| 166 | if (isink == NULL) { |
| 167 | dev_err(&pdev->dev, "Unable to allocate private data\n"); |
| 168 | return -ENOMEM; |
| 169 | } |
| 170 | |
Mark Brown | e8092da | 2009-11-30 14:01:56 +0000 | [diff] [blame] | 171 | isink->wm831x = wm831x; |
| 172 | |
Mark Brown | d4d6b72 | 2009-07-28 15:23:46 +0100 | [diff] [blame] | 173 | res = platform_get_resource(pdev, IORESOURCE_IO, 0); |
| 174 | if (res == NULL) { |
| 175 | dev_err(&pdev->dev, "No I/O resource\n"); |
| 176 | ret = -EINVAL; |
| 177 | goto err; |
| 178 | } |
| 179 | isink->reg = res->start; |
| 180 | |
| 181 | /* For current parts this is correct; probably need to revisit |
| 182 | * in future. |
| 183 | */ |
| 184 | snprintf(isink->name, sizeof(isink->name), "ISINK%d", id + 1); |
| 185 | isink->desc.name = isink->name; |
| 186 | isink->desc.id = id; |
| 187 | isink->desc.ops = &wm831x_isink_ops; |
| 188 | isink->desc.type = REGULATOR_CURRENT; |
| 189 | isink->desc.owner = THIS_MODULE; |
| 190 | |
| 191 | isink->regulator = regulator_register(&isink->desc, &pdev->dev, |
| 192 | pdata->isink[id], isink); |
| 193 | if (IS_ERR(isink->regulator)) { |
| 194 | ret = PTR_ERR(isink->regulator); |
| 195 | dev_err(wm831x->dev, "Failed to register ISINK%d: %d\n", |
| 196 | id + 1, ret); |
| 197 | goto err; |
| 198 | } |
| 199 | |
| 200 | irq = platform_get_irq(pdev, 0); |
| 201 | ret = wm831x_request_irq(wm831x, irq, wm831x_isink_irq, |
| 202 | IRQF_TRIGGER_RISING, isink->name, |
| 203 | isink); |
| 204 | if (ret != 0) { |
| 205 | dev_err(&pdev->dev, "Failed to request ISINK IRQ %d: %d\n", |
| 206 | irq, ret); |
| 207 | goto err_regulator; |
| 208 | } |
| 209 | |
| 210 | platform_set_drvdata(pdev, isink); |
| 211 | |
| 212 | return 0; |
| 213 | |
| 214 | err_regulator: |
| 215 | regulator_unregister(isink->regulator); |
| 216 | err: |
| 217 | kfree(isink); |
| 218 | return ret; |
| 219 | } |
| 220 | |
| 221 | static __devexit int wm831x_isink_remove(struct platform_device *pdev) |
| 222 | { |
| 223 | struct wm831x_isink *isink = platform_get_drvdata(pdev); |
| 224 | struct wm831x *wm831x = isink->wm831x; |
| 225 | |
Dmitry Torokhov | eb66d56 | 2010-02-23 23:38:39 -0800 | [diff] [blame] | 226 | platform_set_drvdata(pdev, NULL); |
| 227 | |
Mark Brown | d4d6b72 | 2009-07-28 15:23:46 +0100 | [diff] [blame] | 228 | wm831x_free_irq(wm831x, platform_get_irq(pdev, 0), isink); |
| 229 | |
| 230 | regulator_unregister(isink->regulator); |
| 231 | kfree(isink); |
| 232 | |
| 233 | return 0; |
| 234 | } |
| 235 | |
| 236 | static struct platform_driver wm831x_isink_driver = { |
| 237 | .probe = wm831x_isink_probe, |
| 238 | .remove = __devexit_p(wm831x_isink_remove), |
| 239 | .driver = { |
| 240 | .name = "wm831x-isink", |
Dmitry Torokhov | eb66d56 | 2010-02-23 23:38:39 -0800 | [diff] [blame] | 241 | .owner = THIS_MODULE, |
Mark Brown | d4d6b72 | 2009-07-28 15:23:46 +0100 | [diff] [blame] | 242 | }, |
| 243 | }; |
| 244 | |
| 245 | static int __init wm831x_isink_init(void) |
| 246 | { |
| 247 | int ret; |
| 248 | ret = platform_driver_register(&wm831x_isink_driver); |
| 249 | if (ret != 0) |
| 250 | pr_err("Failed to register WM831x ISINK driver: %d\n", ret); |
| 251 | |
| 252 | return ret; |
| 253 | } |
| 254 | subsys_initcall(wm831x_isink_init); |
| 255 | |
| 256 | static void __exit wm831x_isink_exit(void) |
| 257 | { |
| 258 | platform_driver_unregister(&wm831x_isink_driver); |
| 259 | } |
| 260 | module_exit(wm831x_isink_exit); |
| 261 | |
| 262 | /* Module information */ |
| 263 | MODULE_AUTHOR("Mark Brown"); |
| 264 | MODULE_DESCRIPTION("WM831x current sink driver"); |
| 265 | MODULE_LICENSE("GPL"); |
| 266 | MODULE_ALIAS("platform:wm831x-isink"); |