13cad5fc8SAxel Lin // SPDX-License-Identifier: GPL-2.0+
23cad5fc8SAxel Lin //
33cad5fc8SAxel Lin // wm831x-isink.c -- Current sink driver for the WM831x series
43cad5fc8SAxel Lin //
53cad5fc8SAxel Lin // Copyright 2009 Wolfson Microelectronics PLC.
63cad5fc8SAxel Lin //
73cad5fc8SAxel Lin // Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
8d4d6b722SMark Brown
9d4d6b722SMark Brown #include <linux/module.h>
10d4d6b722SMark Brown #include <linux/moduleparam.h>
11d4d6b722SMark Brown #include <linux/init.h>
12d4d6b722SMark Brown #include <linux/bitops.h>
13d4d6b722SMark Brown #include <linux/err.h>
14d4d6b722SMark Brown #include <linux/i2c.h>
15d4d6b722SMark Brown #include <linux/platform_device.h>
16d4d6b722SMark Brown #include <linux/regulator/driver.h>
175a0e3ad6STejun Heo #include <linux/slab.h>
18d4d6b722SMark Brown
19d4d6b722SMark Brown #include <linux/mfd/wm831x/core.h>
20d4d6b722SMark Brown #include <linux/mfd/wm831x/regulator.h>
21d4d6b722SMark Brown #include <linux/mfd/wm831x/pdata.h>
22d4d6b722SMark Brown
23d4d6b722SMark Brown #define WM831X_ISINK_MAX_NAME 7
24d4d6b722SMark Brown
25d4d6b722SMark Brown struct wm831x_isink {
26d4d6b722SMark Brown char name[WM831X_ISINK_MAX_NAME];
27d4d6b722SMark Brown struct regulator_desc desc;
28d4d6b722SMark Brown int reg;
29d4d6b722SMark Brown struct wm831x *wm831x;
30d4d6b722SMark Brown struct regulator_dev *regulator;
31d4d6b722SMark Brown };
32d4d6b722SMark Brown
wm831x_isink_enable(struct regulator_dev * rdev)33d4d6b722SMark Brown static int wm831x_isink_enable(struct regulator_dev *rdev)
34d4d6b722SMark Brown {
35d4d6b722SMark Brown struct wm831x_isink *isink = rdev_get_drvdata(rdev);
36d4d6b722SMark Brown struct wm831x *wm831x = isink->wm831x;
37d4d6b722SMark Brown int ret;
38d4d6b722SMark Brown
39d4d6b722SMark Brown /* We have a two stage enable: first start the ISINK... */
40d4d6b722SMark Brown ret = wm831x_set_bits(wm831x, isink->reg, WM831X_CS1_ENA,
41d4d6b722SMark Brown WM831X_CS1_ENA);
42d4d6b722SMark Brown if (ret != 0)
43d4d6b722SMark Brown return ret;
44d4d6b722SMark Brown
45d4d6b722SMark Brown /* ...then enable drive */
46d4d6b722SMark Brown ret = wm831x_set_bits(wm831x, isink->reg, WM831X_CS1_DRIVE,
47d4d6b722SMark Brown WM831X_CS1_DRIVE);
48d4d6b722SMark Brown if (ret != 0)
49d4d6b722SMark Brown wm831x_set_bits(wm831x, isink->reg, WM831X_CS1_ENA, 0);
50d4d6b722SMark Brown
51d4d6b722SMark Brown return ret;
52d4d6b722SMark Brown
53d4d6b722SMark Brown }
54d4d6b722SMark Brown
wm831x_isink_disable(struct regulator_dev * rdev)55d4d6b722SMark Brown static int wm831x_isink_disable(struct regulator_dev *rdev)
56d4d6b722SMark Brown {
57d4d6b722SMark Brown struct wm831x_isink *isink = rdev_get_drvdata(rdev);
58d4d6b722SMark Brown struct wm831x *wm831x = isink->wm831x;
59d4d6b722SMark Brown int ret;
60d4d6b722SMark Brown
61d4d6b722SMark Brown ret = wm831x_set_bits(wm831x, isink->reg, WM831X_CS1_DRIVE, 0);
62d4d6b722SMark Brown if (ret < 0)
63d4d6b722SMark Brown return ret;
64d4d6b722SMark Brown
65d4d6b722SMark Brown ret = wm831x_set_bits(wm831x, isink->reg, WM831X_CS1_ENA, 0);
66d4d6b722SMark Brown if (ret < 0)
67d4d6b722SMark Brown return ret;
68d4d6b722SMark Brown
69d4d6b722SMark Brown return ret;
70d4d6b722SMark Brown
71d4d6b722SMark Brown }
72d4d6b722SMark Brown
wm831x_isink_is_enabled(struct regulator_dev * rdev)73d4d6b722SMark Brown static int wm831x_isink_is_enabled(struct regulator_dev *rdev)
74d4d6b722SMark Brown {
75d4d6b722SMark Brown struct wm831x_isink *isink = rdev_get_drvdata(rdev);
76d4d6b722SMark Brown struct wm831x *wm831x = isink->wm831x;
77d4d6b722SMark Brown int ret;
78d4d6b722SMark Brown
79d4d6b722SMark Brown ret = wm831x_reg_read(wm831x, isink->reg);
80d4d6b722SMark Brown if (ret < 0)
81d4d6b722SMark Brown return ret;
82d4d6b722SMark Brown
83d4d6b722SMark Brown if ((ret & (WM831X_CS1_ENA | WM831X_CS1_DRIVE)) ==
84d4d6b722SMark Brown (WM831X_CS1_ENA | WM831X_CS1_DRIVE))
85d4d6b722SMark Brown return 1;
86d4d6b722SMark Brown else
87d4d6b722SMark Brown return 0;
88d4d6b722SMark Brown }
89d4d6b722SMark Brown
90b0d6dd3bSJulia Lawall static const struct regulator_ops wm831x_isink_ops = {
91d4d6b722SMark Brown .is_enabled = wm831x_isink_is_enabled,
92d4d6b722SMark Brown .enable = wm831x_isink_enable,
93d4d6b722SMark Brown .disable = wm831x_isink_disable,
94d48acfd0SAxel Lin .set_current_limit = regulator_set_current_limit_regmap,
95d48acfd0SAxel Lin .get_current_limit = regulator_get_current_limit_regmap,
96d4d6b722SMark Brown };
97d4d6b722SMark Brown
wm831x_isink_irq(int irq,void * data)98d4d6b722SMark Brown static irqreturn_t wm831x_isink_irq(int irq, void *data)
99d4d6b722SMark Brown {
100d4d6b722SMark Brown struct wm831x_isink *isink = data;
101d4d6b722SMark Brown
102d4d6b722SMark Brown regulator_notifier_call_chain(isink->regulator,
103d4d6b722SMark Brown REGULATOR_EVENT_OVER_CURRENT,
104d4d6b722SMark Brown NULL);
105d4d6b722SMark Brown
106d4d6b722SMark Brown return IRQ_HANDLED;
107d4d6b722SMark Brown }
108d4d6b722SMark Brown
109d4d6b722SMark Brown
wm831x_isink_probe(struct platform_device * pdev)110a5023574SBill Pemberton static int wm831x_isink_probe(struct platform_device *pdev)
111d4d6b722SMark Brown {
112d4d6b722SMark Brown struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
113dff91d0bSJingoo Han struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
114d4d6b722SMark Brown struct wm831x_isink *isink;
115d4d6b722SMark Brown int id = pdev->id % ARRAY_SIZE(pdata->isink);
116c172708dSMark Brown struct regulator_config config = { };
117d4d6b722SMark Brown struct resource *res;
118d4d6b722SMark Brown int ret, irq;
119d4d6b722SMark Brown
120d4d6b722SMark Brown dev_dbg(&pdev->dev, "Probing ISINK%d\n", id + 1);
121d4d6b722SMark Brown
122d4d6b722SMark Brown if (pdata == NULL || pdata->isink[id] == NULL)
123d4d6b722SMark Brown return -ENODEV;
124d4d6b722SMark Brown
125fded2f4fSMark Brown isink = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_isink),
126fded2f4fSMark Brown GFP_KERNEL);
127d718debcSSachin Kamat if (!isink)
128d4d6b722SMark Brown return -ENOMEM;
129d4d6b722SMark Brown
130e8092da9SMark Brown isink->wm831x = wm831x;
131e8092da9SMark Brown
1325656098eSMark Brown res = platform_get_resource(pdev, IORESOURCE_REG, 0);
133d4d6b722SMark Brown if (res == NULL) {
1345656098eSMark Brown dev_err(&pdev->dev, "No REG resource\n");
135d4d6b722SMark Brown ret = -EINVAL;
136d4d6b722SMark Brown goto err;
137d4d6b722SMark Brown }
138d4d6b722SMark Brown isink->reg = res->start;
139d4d6b722SMark Brown
140d4d6b722SMark Brown /* For current parts this is correct; probably need to revisit
141d4d6b722SMark Brown * in future.
142d4d6b722SMark Brown */
143d4d6b722SMark Brown snprintf(isink->name, sizeof(isink->name), "ISINK%d", id + 1);
144d4d6b722SMark Brown isink->desc.name = isink->name;
145d4d6b722SMark Brown isink->desc.id = id;
146d4d6b722SMark Brown isink->desc.ops = &wm831x_isink_ops;
147d4d6b722SMark Brown isink->desc.type = REGULATOR_CURRENT;
148d4d6b722SMark Brown isink->desc.owner = THIS_MODULE;
149d48acfd0SAxel Lin isink->desc.curr_table = wm831x_isinkv_values,
150d48acfd0SAxel Lin isink->desc.n_current_limits = ARRAY_SIZE(wm831x_isinkv_values),
151d48acfd0SAxel Lin isink->desc.csel_reg = isink->reg,
152d48acfd0SAxel Lin isink->desc.csel_mask = WM831X_CS1_ISEL_MASK,
153d4d6b722SMark Brown
154c172708dSMark Brown config.dev = pdev->dev.parent;
155c172708dSMark Brown config.init_data = pdata->isink[id];
156c172708dSMark Brown config.driver_data = isink;
157d48acfd0SAxel Lin config.regmap = wm831x->regmap;
158c172708dSMark Brown
159af151dedSMark Brown isink->regulator = devm_regulator_register(&pdev->dev, &isink->desc,
160af151dedSMark Brown &config);
161d4d6b722SMark Brown if (IS_ERR(isink->regulator)) {
162d4d6b722SMark Brown ret = PTR_ERR(isink->regulator);
163d4d6b722SMark Brown dev_err(wm831x->dev, "Failed to register ISINK%d: %d\n",
164d4d6b722SMark Brown id + 1, ret);
165d4d6b722SMark Brown goto err;
166d4d6b722SMark Brown }
167d4d6b722SMark Brown
168cd99758bSMark Brown irq = wm831x_irq(wm831x, platform_get_irq(pdev, 0));
16963fb3149SMark Brown ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
17063fb3149SMark Brown wm831x_isink_irq,
17129454738SFabio Estevam IRQF_TRIGGER_RISING | IRQF_ONESHOT,
17229454738SFabio Estevam isink->name,
17363fb3149SMark Brown isink);
174d4d6b722SMark Brown if (ret != 0) {
175d4d6b722SMark Brown dev_err(&pdev->dev, "Failed to request ISINK IRQ %d: %d\n",
176d4d6b722SMark Brown irq, ret);
177af151dedSMark Brown goto err;
178d4d6b722SMark Brown }
179d4d6b722SMark Brown
180d4d6b722SMark Brown platform_set_drvdata(pdev, isink);
181d4d6b722SMark Brown
182d4d6b722SMark Brown return 0;
183d4d6b722SMark Brown
184d4d6b722SMark Brown err:
185d4d6b722SMark Brown return ret;
186d4d6b722SMark Brown }
187d4d6b722SMark Brown
188d4d6b722SMark Brown static struct platform_driver wm831x_isink_driver = {
189d4d6b722SMark Brown .probe = wm831x_isink_probe,
190d4d6b722SMark Brown .driver = {
191d4d6b722SMark Brown .name = "wm831x-isink",
192*259b93b2SDouglas Anderson .probe_type = PROBE_PREFER_ASYNCHRONOUS,
193d4d6b722SMark Brown },
194d4d6b722SMark Brown };
195d4d6b722SMark Brown
wm831x_isink_init(void)196d4d6b722SMark Brown static int __init wm831x_isink_init(void)
197d4d6b722SMark Brown {
198d4d6b722SMark Brown int ret;
199d4d6b722SMark Brown ret = platform_driver_register(&wm831x_isink_driver);
200d4d6b722SMark Brown if (ret != 0)
201d4d6b722SMark Brown pr_err("Failed to register WM831x ISINK driver: %d\n", ret);
202d4d6b722SMark Brown
203d4d6b722SMark Brown return ret;
204d4d6b722SMark Brown }
205d4d6b722SMark Brown subsys_initcall(wm831x_isink_init);
206d4d6b722SMark Brown
wm831x_isink_exit(void)207d4d6b722SMark Brown static void __exit wm831x_isink_exit(void)
208d4d6b722SMark Brown {
209d4d6b722SMark Brown platform_driver_unregister(&wm831x_isink_driver);
210d4d6b722SMark Brown }
211d4d6b722SMark Brown module_exit(wm831x_isink_exit);
212d4d6b722SMark Brown
213d4d6b722SMark Brown /* Module information */
214d4d6b722SMark Brown MODULE_AUTHOR("Mark Brown");
215d4d6b722SMark Brown MODULE_DESCRIPTION("WM831x current sink driver");
216d4d6b722SMark Brown MODULE_LICENSE("GPL");
217d4d6b722SMark Brown MODULE_ALIAS("platform:wm831x-isink");
218