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Linux/drivers/regulator/wm831x-isink.c

  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>
 22 #include <linux/slab.h>
 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 int wm831x_isink_probe(struct platform_device *pdev)
152 {
153         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
154         struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
155         struct wm831x_isink *isink;
156         int id = pdev->id % ARRAY_SIZE(pdata->isink);
157         struct regulator_config config = { };
158         struct resource *res;
159         int ret, irq;
160 
161         dev_dbg(&pdev->dev, "Probing ISINK%d\n", id + 1);
162 
163         if (pdata == NULL || pdata->isink[id] == NULL)
164                 return -ENODEV;
165 
166         isink = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_isink),
167                              GFP_KERNEL);
168         if (!isink)
169                 return -ENOMEM;
170 
171         isink->wm831x = wm831x;
172 
173         res = platform_get_resource(pdev, IORESOURCE_REG, 0);
174         if (res == NULL) {
175                 dev_err(&pdev->dev, "No REG 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         config.dev = pdev->dev.parent;
192         config.init_data = pdata->isink[id];
193         config.driver_data = isink;
194 
195         isink->regulator = devm_regulator_register(&pdev->dev, &isink->desc,
196                                                    &config);
197         if (IS_ERR(isink->regulator)) {
198                 ret = PTR_ERR(isink->regulator);
199                 dev_err(wm831x->dev, "Failed to register ISINK%d: %d\n",
200                         id + 1, ret);
201                 goto err;
202         }
203 
204         irq = wm831x_irq(wm831x, platform_get_irq(pdev, 0));
205         ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
206                                         wm831x_isink_irq,
207                                         IRQF_TRIGGER_RISING, isink->name,
208                                         isink);
209         if (ret != 0) {
210                 dev_err(&pdev->dev, "Failed to request ISINK IRQ %d: %d\n",
211                         irq, ret);
212                 goto err;
213         }
214 
215         platform_set_drvdata(pdev, isink);
216 
217         return 0;
218 
219 err:
220         return ret;
221 }
222 
223 static struct platform_driver wm831x_isink_driver = {
224         .probe = wm831x_isink_probe,
225         .driver         = {
226                 .name   = "wm831x-isink",
227                 .owner  = THIS_MODULE,
228         },
229 };
230 
231 static int __init wm831x_isink_init(void)
232 {
233         int ret;
234         ret = platform_driver_register(&wm831x_isink_driver);
235         if (ret != 0)
236                 pr_err("Failed to register WM831x ISINK driver: %d\n", ret);
237 
238         return ret;
239 }
240 subsys_initcall(wm831x_isink_init);
241 
242 static void __exit wm831x_isink_exit(void)
243 {
244         platform_driver_unregister(&wm831x_isink_driver);
245 }
246 module_exit(wm831x_isink_exit);
247 
248 /* Module information */
249 MODULE_AUTHOR("Mark Brown");
250 MODULE_DESCRIPTION("WM831x current sink driver");
251 MODULE_LICENSE("GPL");
252 MODULE_ALIAS("platform:wm831x-isink");
253 

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