Merge tag 'for-linus-5.10b-rc1b-tag' of git://git.kernel.org/pub/scm/linux/kernel...
[linux-2.6-microblaze.git] / drivers / regulator / wm831x-isink.c
1 // SPDX-License-Identifier: GPL-2.0+
2 //
3 // wm831x-isink.c  --  Current sink driver for the WM831x series
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/i2c.h>
15 #include <linux/platform_device.h>
16 #include <linux/regulator/driver.h>
17 #include <linux/slab.h>
18
19 #include <linux/mfd/wm831x/core.h>
20 #include <linux/mfd/wm831x/regulator.h>
21 #include <linux/mfd/wm831x/pdata.h>
22
23 #define WM831X_ISINK_MAX_NAME 7
24
25 struct wm831x_isink {
26         char name[WM831X_ISINK_MAX_NAME];
27         struct regulator_desc desc;
28         int reg;
29         struct wm831x *wm831x;
30         struct regulator_dev *regulator;
31 };
32
33 static int wm831x_isink_enable(struct regulator_dev *rdev)
34 {
35         struct wm831x_isink *isink = rdev_get_drvdata(rdev);
36         struct wm831x *wm831x = isink->wm831x;
37         int ret;
38
39         /* We have a two stage enable: first start the ISINK... */
40         ret = wm831x_set_bits(wm831x, isink->reg, WM831X_CS1_ENA,
41                               WM831X_CS1_ENA);
42         if (ret != 0)
43                 return ret;
44
45         /* ...then enable drive */
46         ret = wm831x_set_bits(wm831x, isink->reg, WM831X_CS1_DRIVE,
47                               WM831X_CS1_DRIVE);
48         if (ret != 0)
49                 wm831x_set_bits(wm831x, isink->reg, WM831X_CS1_ENA, 0);
50
51         return ret;
52
53 }
54
55 static int wm831x_isink_disable(struct regulator_dev *rdev)
56 {
57         struct wm831x_isink *isink = rdev_get_drvdata(rdev);
58         struct wm831x *wm831x = isink->wm831x;
59         int ret;
60
61         ret = wm831x_set_bits(wm831x, isink->reg, WM831X_CS1_DRIVE, 0);
62         if (ret < 0)
63                 return ret;
64
65         ret = wm831x_set_bits(wm831x, isink->reg, WM831X_CS1_ENA, 0);
66         if (ret < 0)
67                 return ret;
68
69         return ret;
70
71 }
72
73 static int wm831x_isink_is_enabled(struct regulator_dev *rdev)
74 {
75         struct wm831x_isink *isink = rdev_get_drvdata(rdev);
76         struct wm831x *wm831x = isink->wm831x;
77         int ret;
78
79         ret = wm831x_reg_read(wm831x, isink->reg);
80         if (ret < 0)
81                 return ret;
82
83         if ((ret & (WM831X_CS1_ENA | WM831X_CS1_DRIVE)) ==
84             (WM831X_CS1_ENA | WM831X_CS1_DRIVE))
85                 return 1;
86         else
87                 return 0;
88 }
89
90 static const struct regulator_ops wm831x_isink_ops = {
91         .is_enabled = wm831x_isink_is_enabled,
92         .enable = wm831x_isink_enable,
93         .disable = wm831x_isink_disable,
94         .set_current_limit = regulator_set_current_limit_regmap,
95         .get_current_limit = regulator_get_current_limit_regmap,
96 };
97
98 static irqreturn_t wm831x_isink_irq(int irq, void *data)
99 {
100         struct wm831x_isink *isink = data;
101
102         regulator_notifier_call_chain(isink->regulator,
103                                       REGULATOR_EVENT_OVER_CURRENT,
104                                       NULL);
105
106         return IRQ_HANDLED;
107 }
108
109
110 static int wm831x_isink_probe(struct platform_device *pdev)
111 {
112         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
113         struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
114         struct wm831x_isink *isink;
115         int id = pdev->id % ARRAY_SIZE(pdata->isink);
116         struct regulator_config config = { };
117         struct resource *res;
118         int ret, irq;
119
120         dev_dbg(&pdev->dev, "Probing ISINK%d\n", id + 1);
121
122         if (pdata == NULL || pdata->isink[id] == NULL)
123                 return -ENODEV;
124
125         isink = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_isink),
126                              GFP_KERNEL);
127         if (!isink)
128                 return -ENOMEM;
129
130         isink->wm831x = wm831x;
131
132         res = platform_get_resource(pdev, IORESOURCE_REG, 0);
133         if (res == NULL) {
134                 dev_err(&pdev->dev, "No REG resource\n");
135                 ret = -EINVAL;
136                 goto err;
137         }
138         isink->reg = res->start;
139
140         /* For current parts this is correct; probably need to revisit
141          * in future.
142          */
143         snprintf(isink->name, sizeof(isink->name), "ISINK%d", id + 1);
144         isink->desc.name = isink->name;
145         isink->desc.id = id;
146         isink->desc.ops = &wm831x_isink_ops;
147         isink->desc.type = REGULATOR_CURRENT;
148         isink->desc.owner = THIS_MODULE;
149         isink->desc.curr_table = wm831x_isinkv_values,
150         isink->desc.n_current_limits = ARRAY_SIZE(wm831x_isinkv_values),
151         isink->desc.csel_reg = isink->reg,
152         isink->desc.csel_mask = WM831X_CS1_ISEL_MASK,
153
154         config.dev = pdev->dev.parent;
155         config.init_data = pdata->isink[id];
156         config.driver_data = isink;
157         config.regmap = wm831x->regmap;
158
159         isink->regulator = devm_regulator_register(&pdev->dev, &isink->desc,
160                                                    &config);
161         if (IS_ERR(isink->regulator)) {
162                 ret = PTR_ERR(isink->regulator);
163                 dev_err(wm831x->dev, "Failed to register ISINK%d: %d\n",
164                         id + 1, ret);
165                 goto err;
166         }
167
168         irq = wm831x_irq(wm831x, platform_get_irq(pdev, 0));
169         ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
170                                         wm831x_isink_irq,
171                                         IRQF_TRIGGER_RISING | IRQF_ONESHOT,
172                                         isink->name,
173                                         isink);
174         if (ret != 0) {
175                 dev_err(&pdev->dev, "Failed to request ISINK IRQ %d: %d\n",
176                         irq, ret);
177                 goto err;
178         }
179
180         platform_set_drvdata(pdev, isink);
181
182         return 0;
183
184 err:
185         return ret;
186 }
187
188 static struct platform_driver wm831x_isink_driver = {
189         .probe = wm831x_isink_probe,
190         .driver         = {
191                 .name   = "wm831x-isink",
192         },
193 };
194
195 static int __init wm831x_isink_init(void)
196 {
197         int ret;
198         ret = platform_driver_register(&wm831x_isink_driver);
199         if (ret != 0)
200                 pr_err("Failed to register WM831x ISINK driver: %d\n", ret);
201
202         return ret;
203 }
204 subsys_initcall(wm831x_isink_init);
205
206 static void __exit wm831x_isink_exit(void)
207 {
208         platform_driver_unregister(&wm831x_isink_driver);
209 }
210 module_exit(wm831x_isink_exit);
211
212 /* Module information */
213 MODULE_AUTHOR("Mark Brown");
214 MODULE_DESCRIPTION("WM831x current sink driver");
215 MODULE_LICENSE("GPL");
216 MODULE_ALIAS("platform:wm831x-isink");