1d2912cb1SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only
2c746b551SMark Brown /*
3c746b551SMark Brown * LED driver for WM831x status LEDs
4c746b551SMark Brown *
5c746b551SMark Brown * Copyright(C) 2009 Wolfson Microelectronics PLC.
6c746b551SMark Brown */
7c746b551SMark Brown
8c746b551SMark Brown #include <linux/kernel.h>
9c746b551SMark Brown #include <linux/platform_device.h>
105a0e3ad6STejun Heo #include <linux/slab.h>
11c746b551SMark Brown #include <linux/leds.h>
12c746b551SMark Brown #include <linux/err.h>
13c746b551SMark Brown #include <linux/mfd/wm831x/core.h>
14c746b551SMark Brown #include <linux/mfd/wm831x/pdata.h>
15c746b551SMark Brown #include <linux/mfd/wm831x/status.h>
1654f4dedbSPaul Gortmaker #include <linux/module.h>
17c746b551SMark Brown
18c746b551SMark Brown
19c746b551SMark Brown struct wm831x_status {
20c746b551SMark Brown struct led_classdev cdev;
21c746b551SMark Brown struct wm831x *wm831x;
22c746b551SMark Brown struct mutex mutex;
23c746b551SMark Brown
24c746b551SMark Brown spinlock_t value_lock;
25c746b551SMark Brown int reg; /* Control register */
26c746b551SMark Brown int reg_val; /* Control register value */
27c746b551SMark Brown
28c746b551SMark Brown int blink;
29c746b551SMark Brown int blink_time;
30c746b551SMark Brown int blink_cyc;
31c746b551SMark Brown int src;
32c746b551SMark Brown enum led_brightness brightness;
33c746b551SMark Brown };
34c746b551SMark Brown
35c746b551SMark Brown #define to_wm831x_status(led_cdev) \
36c746b551SMark Brown container_of(led_cdev, struct wm831x_status, cdev)
37c746b551SMark Brown
wm831x_status_set(struct wm831x_status * led)38f633a512SAndrew Lunn static void wm831x_status_set(struct wm831x_status *led)
39c746b551SMark Brown {
40c746b551SMark Brown unsigned long flags;
41c746b551SMark Brown
42c746b551SMark Brown mutex_lock(&led->mutex);
43c746b551SMark Brown
44c746b551SMark Brown led->reg_val &= ~(WM831X_LED_SRC_MASK | WM831X_LED_MODE_MASK |
45c746b551SMark Brown WM831X_LED_DUTY_CYC_MASK | WM831X_LED_DUR_MASK);
46c746b551SMark Brown
47c746b551SMark Brown spin_lock_irqsave(&led->value_lock, flags);
48c746b551SMark Brown
49c746b551SMark Brown led->reg_val |= led->src << WM831X_LED_SRC_SHIFT;
50c746b551SMark Brown if (led->blink) {
51c746b551SMark Brown led->reg_val |= 2 << WM831X_LED_MODE_SHIFT;
52c746b551SMark Brown led->reg_val |= led->blink_time << WM831X_LED_DUR_SHIFT;
53c746b551SMark Brown led->reg_val |= led->blink_cyc;
54c746b551SMark Brown } else {
55c746b551SMark Brown if (led->brightness != LED_OFF)
56c746b551SMark Brown led->reg_val |= 1 << WM831X_LED_MODE_SHIFT;
57c746b551SMark Brown }
58c746b551SMark Brown
59c746b551SMark Brown spin_unlock_irqrestore(&led->value_lock, flags);
60c746b551SMark Brown
61c746b551SMark Brown wm831x_reg_write(led->wm831x, led->reg, led->reg_val);
62c746b551SMark Brown
63c746b551SMark Brown mutex_unlock(&led->mutex);
64c746b551SMark Brown }
65c746b551SMark Brown
wm831x_status_brightness_set(struct led_classdev * led_cdev,enum led_brightness value)66f633a512SAndrew Lunn static int wm831x_status_brightness_set(struct led_classdev *led_cdev,
67c746b551SMark Brown enum led_brightness value)
68c746b551SMark Brown {
69c746b551SMark Brown struct wm831x_status *led = to_wm831x_status(led_cdev);
70c746b551SMark Brown unsigned long flags;
71c746b551SMark Brown
72c746b551SMark Brown spin_lock_irqsave(&led->value_lock, flags);
73c746b551SMark Brown led->brightness = value;
74c746b551SMark Brown if (value == LED_OFF)
75c746b551SMark Brown led->blink = 0;
76c746b551SMark Brown spin_unlock_irqrestore(&led->value_lock, flags);
77f633a512SAndrew Lunn wm831x_status_set(led);
78f633a512SAndrew Lunn
79f633a512SAndrew Lunn return 0;
80c746b551SMark Brown }
81c746b551SMark Brown
wm831x_status_blink_set(struct led_classdev * led_cdev,unsigned long * delay_on,unsigned long * delay_off)82c746b551SMark Brown static int wm831x_status_blink_set(struct led_classdev *led_cdev,
83c746b551SMark Brown unsigned long *delay_on,
84c746b551SMark Brown unsigned long *delay_off)
85c746b551SMark Brown {
86c746b551SMark Brown struct wm831x_status *led = to_wm831x_status(led_cdev);
87c746b551SMark Brown unsigned long flags;
88c746b551SMark Brown int ret = 0;
89c746b551SMark Brown
90c746b551SMark Brown /* Pick some defaults if we've not been given times */
91c746b551SMark Brown if (*delay_on == 0 && *delay_off == 0) {
92c746b551SMark Brown *delay_on = 250;
93c746b551SMark Brown *delay_off = 250;
94c746b551SMark Brown }
95c746b551SMark Brown
96c746b551SMark Brown spin_lock_irqsave(&led->value_lock, flags);
97c746b551SMark Brown
98c746b551SMark Brown /* We only have a limited selection of settings, see if we can
99c746b551SMark Brown * support the configuration we're being given */
100c746b551SMark Brown switch (*delay_on) {
101c746b551SMark Brown case 1000:
102c746b551SMark Brown led->blink_time = 0;
103c746b551SMark Brown break;
104c746b551SMark Brown case 250:
105c746b551SMark Brown led->blink_time = 1;
106c746b551SMark Brown break;
107c746b551SMark Brown case 125:
108c746b551SMark Brown led->blink_time = 2;
109c746b551SMark Brown break;
110c746b551SMark Brown case 62:
111c746b551SMark Brown case 63:
112c746b551SMark Brown /* Actually 62.5ms */
113c746b551SMark Brown led->blink_time = 3;
114c746b551SMark Brown break;
115c746b551SMark Brown default:
116c746b551SMark Brown ret = -EINVAL;
117c746b551SMark Brown break;
118c746b551SMark Brown }
119c746b551SMark Brown
120c746b551SMark Brown if (ret == 0) {
121c746b551SMark Brown switch (*delay_off / *delay_on) {
122c746b551SMark Brown case 1:
123c746b551SMark Brown led->blink_cyc = 0;
124c746b551SMark Brown break;
125c746b551SMark Brown case 3:
126c746b551SMark Brown led->blink_cyc = 1;
127c746b551SMark Brown break;
128c746b551SMark Brown case 4:
129c746b551SMark Brown led->blink_cyc = 2;
130c746b551SMark Brown break;
131c746b551SMark Brown case 8:
132c746b551SMark Brown led->blink_cyc = 3;
133c746b551SMark Brown break;
134c746b551SMark Brown default:
135c746b551SMark Brown ret = -EINVAL;
136c746b551SMark Brown break;
137c746b551SMark Brown }
138c746b551SMark Brown }
139c746b551SMark Brown
140c746b551SMark Brown if (ret == 0)
141c746b551SMark Brown led->blink = 1;
142c746b551SMark Brown else
143c746b551SMark Brown led->blink = 0;
144c746b551SMark Brown
145c746b551SMark Brown spin_unlock_irqrestore(&led->value_lock, flags);
146f633a512SAndrew Lunn wm831x_status_set(led);
147c746b551SMark Brown
148c746b551SMark Brown return ret;
149c746b551SMark Brown }
150c746b551SMark Brown
1518a4529a3SJingoo Han static const char * const led_src_texts[] = {
152c746b551SMark Brown "otp",
153c746b551SMark Brown "power",
154c746b551SMark Brown "charger",
155c746b551SMark Brown "soft",
156c746b551SMark Brown };
157c746b551SMark Brown
src_show(struct device * dev,struct device_attribute * attr,char * buf)158*5ccfa39dSDwaipayan Ray static ssize_t src_show(struct device *dev,
159c746b551SMark Brown struct device_attribute *attr, char *buf)
160c746b551SMark Brown {
161c746b551SMark Brown struct led_classdev *led_cdev = dev_get_drvdata(dev);
162c746b551SMark Brown struct wm831x_status *led = to_wm831x_status(led_cdev);
163c746b551SMark Brown int i;
164c746b551SMark Brown ssize_t ret = 0;
165c746b551SMark Brown
166c746b551SMark Brown mutex_lock(&led->mutex);
167c746b551SMark Brown
168c746b551SMark Brown for (i = 0; i < ARRAY_SIZE(led_src_texts); i++)
169c746b551SMark Brown if (i == led->src)
170c746b551SMark Brown ret += sprintf(&buf[ret], "[%s] ", led_src_texts[i]);
171c746b551SMark Brown else
172c746b551SMark Brown ret += sprintf(&buf[ret], "%s ", led_src_texts[i]);
173c746b551SMark Brown
174c746b551SMark Brown mutex_unlock(&led->mutex);
175c746b551SMark Brown
176c746b551SMark Brown ret += sprintf(&buf[ret], "\n");
177c746b551SMark Brown
178c746b551SMark Brown return ret;
179c746b551SMark Brown }
180c746b551SMark Brown
src_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t size)181*5ccfa39dSDwaipayan Ray static ssize_t src_store(struct device *dev,
182c746b551SMark Brown struct device_attribute *attr,
183c746b551SMark Brown const char *buf, size_t size)
184c746b551SMark Brown {
185c746b551SMark Brown struct led_classdev *led_cdev = dev_get_drvdata(dev);
186c746b551SMark Brown struct wm831x_status *led = to_wm831x_status(led_cdev);
187c746b551SMark Brown int i;
188c746b551SMark Brown
189d54e5b52SAndy Shevchenko i = sysfs_match_string(led_src_texts, buf);
190d54e5b52SAndy Shevchenko if (i >= 0) {
191c746b551SMark Brown mutex_lock(&led->mutex);
192c746b551SMark Brown led->src = i;
193c746b551SMark Brown mutex_unlock(&led->mutex);
194f633a512SAndrew Lunn wm831x_status_set(led);
195c746b551SMark Brown }
196c746b551SMark Brown
197c746b551SMark Brown return size;
198c746b551SMark Brown }
199c746b551SMark Brown
200*5ccfa39dSDwaipayan Ray static DEVICE_ATTR_RW(src);
201c746b551SMark Brown
202b2015ed5SJohan Hovold static struct attribute *wm831x_status_attrs[] = {
203b2015ed5SJohan Hovold &dev_attr_src.attr,
204b2015ed5SJohan Hovold NULL
205b2015ed5SJohan Hovold };
206b2015ed5SJohan Hovold ATTRIBUTE_GROUPS(wm831x_status);
207b2015ed5SJohan Hovold
wm831x_status_probe(struct platform_device * pdev)208c746b551SMark Brown static int wm831x_status_probe(struct platform_device *pdev)
209c746b551SMark Brown {
210c746b551SMark Brown struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
211c746b551SMark Brown struct wm831x_pdata *chip_pdata;
212c746b551SMark Brown struct wm831x_status_pdata pdata;
213c746b551SMark Brown struct wm831x_status *drvdata;
214c746b551SMark Brown struct resource *res;
215c746b551SMark Brown int id = pdev->id % ARRAY_SIZE(chip_pdata->status);
216c746b551SMark Brown int ret;
217c746b551SMark Brown
21861abeba5SMark Brown res = platform_get_resource(pdev, IORESOURCE_REG, 0);
219c746b551SMark Brown if (res == NULL) {
22061abeba5SMark Brown dev_err(&pdev->dev, "No register resource\n");
221b2015ed5SJohan Hovold return -EINVAL;
222c746b551SMark Brown }
223c746b551SMark Brown
2241713cb9dSMark Brown drvdata = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_status),
2251713cb9dSMark Brown GFP_KERNEL);
226c746b551SMark Brown if (!drvdata)
227c746b551SMark Brown return -ENOMEM;
228c746b551SMark Brown
229c746b551SMark Brown drvdata->wm831x = wm831x;
230c746b551SMark Brown drvdata->reg = res->start;
231c746b551SMark Brown
23287aae1eaSJingoo Han if (dev_get_platdata(wm831x->dev))
23387aae1eaSJingoo Han chip_pdata = dev_get_platdata(wm831x->dev);
234c746b551SMark Brown else
235c746b551SMark Brown chip_pdata = NULL;
236c746b551SMark Brown
237c746b551SMark Brown memset(&pdata, 0, sizeof(pdata));
238c746b551SMark Brown if (chip_pdata && chip_pdata->status[id])
239c746b551SMark Brown memcpy(&pdata, chip_pdata->status[id], sizeof(pdata));
240c746b551SMark Brown else
241c746b551SMark Brown pdata.name = dev_name(&pdev->dev);
242c746b551SMark Brown
243c746b551SMark Brown mutex_init(&drvdata->mutex);
244c746b551SMark Brown spin_lock_init(&drvdata->value_lock);
245c746b551SMark Brown
246c746b551SMark Brown /* We cache the configuration register and read startup values
247c746b551SMark Brown * from it. */
248c746b551SMark Brown drvdata->reg_val = wm831x_reg_read(wm831x, drvdata->reg);
249c746b551SMark Brown
250c746b551SMark Brown if (drvdata->reg_val & WM831X_LED_MODE_MASK)
251c746b551SMark Brown drvdata->brightness = LED_FULL;
252c746b551SMark Brown else
253c746b551SMark Brown drvdata->brightness = LED_OFF;
254c746b551SMark Brown
255c746b551SMark Brown /* Set a default source if configured, otherwise leave the
256c746b551SMark Brown * current hardware setting.
257c746b551SMark Brown */
258c746b551SMark Brown if (pdata.default_src == WM831X_STATUS_PRESERVE) {
259c746b551SMark Brown drvdata->src = drvdata->reg_val;
260c746b551SMark Brown drvdata->src &= WM831X_LED_SRC_MASK;
261c746b551SMark Brown drvdata->src >>= WM831X_LED_SRC_SHIFT;
262c746b551SMark Brown } else {
263c746b551SMark Brown drvdata->src = pdata.default_src - 1;
264c746b551SMark Brown }
265c746b551SMark Brown
266c746b551SMark Brown drvdata->cdev.name = pdata.name;
267c746b551SMark Brown drvdata->cdev.default_trigger = pdata.default_trigger;
268f633a512SAndrew Lunn drvdata->cdev.brightness_set_blocking = wm831x_status_brightness_set;
269c746b551SMark Brown drvdata->cdev.blink_set = wm831x_status_blink_set;
270b2015ed5SJohan Hovold drvdata->cdev.groups = wm831x_status_groups;
271c746b551SMark Brown
27247a459ecSJohan Hovold ret = led_classdev_register(wm831x->dev, &drvdata->cdev);
273c746b551SMark Brown if (ret < 0) {
274c746b551SMark Brown dev_err(&pdev->dev, "Failed to register LED: %d\n", ret);
275b2015ed5SJohan Hovold return ret;
276c746b551SMark Brown }
277c746b551SMark Brown
27847a459ecSJohan Hovold platform_set_drvdata(pdev, drvdata);
27947a459ecSJohan Hovold
28047a459ecSJohan Hovold return 0;
28147a459ecSJohan Hovold }
28247a459ecSJohan Hovold
wm831x_status_remove(struct platform_device * pdev)28347a459ecSJohan Hovold static int wm831x_status_remove(struct platform_device *pdev)
28447a459ecSJohan Hovold {
28547a459ecSJohan Hovold struct wm831x_status *drvdata = platform_get_drvdata(pdev);
28647a459ecSJohan Hovold
28747a459ecSJohan Hovold led_classdev_unregister(&drvdata->cdev);
28847a459ecSJohan Hovold
289c746b551SMark Brown return 0;
290c746b551SMark Brown }
291c746b551SMark Brown
292c746b551SMark Brown static struct platform_driver wm831x_status_driver = {
293c746b551SMark Brown .driver = {
294c746b551SMark Brown .name = "wm831x-status",
295c746b551SMark Brown },
296c746b551SMark Brown .probe = wm831x_status_probe,
29747a459ecSJohan Hovold .remove = wm831x_status_remove,
298c746b551SMark Brown };
299c746b551SMark Brown
300892a8843SAxel Lin module_platform_driver(wm831x_status_driver);
301c746b551SMark Brown
302c746b551SMark Brown MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
303c746b551SMark Brown MODULE_DESCRIPTION("WM831x status LED driver");
304c746b551SMark Brown MODULE_LICENSE("GPL");
305c746b551SMark Brown MODULE_ALIAS("platform:wm831x-status");
306