1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * LEDs driver for Freescale MC13783/MC13892/MC34708
4 *
5 * Copyright (C) 2010 Philippe R��tornaz
6 *
7 * Based on leds-da903x:
8 * Copyright (C) 2008 Compulab, Ltd.
9 *      Mike Rapoport <mike@compulab.co.il>
10 *
11 * Copyright (C) 2006-2008 Marvell International Ltd.
12 *      Eric Miao <eric.miao@marvell.com>
13 */
14
15#include <linux/module.h>
16#include <linux/kernel.h>
17#include <linux/platform_device.h>
18#include <linux/leds.h>
19#include <linux/of.h>
20#include <linux/mfd/mc13xxx.h>
21
22struct mc13xxx_led_devtype {
23	int	led_min;
24	int	led_max;
25	int	num_regs;
26	u32	ledctrl_base;
27};
28
29struct mc13xxx_led {
30	struct led_classdev	cdev;
31	int			id;
32	struct mc13xxx_leds	*leds;
33};
34
35struct mc13xxx_leds {
36	struct mc13xxx			*master;
37	struct mc13xxx_led_devtype	*devtype;
38	int				num_leds;
39	struct mc13xxx_led		*led;
40};
41
42static unsigned int mc13xxx_max_brightness(int id)
43{
44	if (id >= MC13783_LED_MD && id <= MC13783_LED_KP)
45		return 0x0f;
46	else if (id >= MC13783_LED_R1 && id <= MC13783_LED_B3)
47		return 0x1f;
48
49	return 0x3f;
50}
51
52static int mc13xxx_led_set(struct led_classdev *led_cdev,
53			    enum led_brightness value)
54{
55	struct mc13xxx_led *led =
56		container_of(led_cdev, struct mc13xxx_led, cdev);
57	struct mc13xxx_leds *leds = led->leds;
58	unsigned int reg, bank, off, shift;
59
60	switch (led->id) {
61	case MC13783_LED_MD:
62	case MC13783_LED_AD:
63	case MC13783_LED_KP:
64		reg = 2;
65		shift = 9 + (led->id - MC13783_LED_MD) * 4;
66		break;
67	case MC13783_LED_R1:
68	case MC13783_LED_G1:
69	case MC13783_LED_B1:
70	case MC13783_LED_R2:
71	case MC13783_LED_G2:
72	case MC13783_LED_B2:
73	case MC13783_LED_R3:
74	case MC13783_LED_G3:
75	case MC13783_LED_B3:
76		off = led->id - MC13783_LED_R1;
77		bank = off / 3;
78		reg = 3 + bank;
79		shift = (off - bank * 3) * 5 + 6;
80		break;
81	case MC13892_LED_MD:
82	case MC13892_LED_AD:
83	case MC13892_LED_KP:
84		off = led->id - MC13892_LED_MD;
85		reg = off / 2;
86		shift = 3 + (off - reg * 2) * 12;
87		break;
88	case MC13892_LED_R:
89	case MC13892_LED_G:
90	case MC13892_LED_B:
91		off = led->id - MC13892_LED_R;
92		bank = off / 2;
93		reg = 2 + bank;
94		shift = (off - bank * 2) * 12 + 3;
95		break;
96	case MC34708_LED_R:
97	case MC34708_LED_G:
98		reg = 0;
99		shift = 3 + (led->id - MC34708_LED_R) * 12;
100		break;
101	default:
102		BUG();
103	}
104
105	return mc13xxx_reg_rmw(leds->master, leds->devtype->ledctrl_base + reg,
106			mc13xxx_max_brightness(led->id) << shift,
107			value << shift);
108}
109
110#ifdef CONFIG_OF
111static struct mc13xxx_leds_platform_data __init *mc13xxx_led_probe_dt(
112	struct platform_device *pdev)
113{
114	struct mc13xxx_leds *leds = platform_get_drvdata(pdev);
115	struct mc13xxx_leds_platform_data *pdata;
116	struct device_node *parent, *child;
117	struct device *dev = &pdev->dev;
118	int i = 0, ret = -ENODATA;
119
120	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
121	if (!pdata)
122		return ERR_PTR(-ENOMEM);
123
124	parent = of_get_child_by_name(dev_of_node(dev->parent), "leds");
125	if (!parent)
126		goto out_node_put;
127
128	ret = of_property_read_u32_array(parent, "led-control",
129					 pdata->led_control,
130					 leds->devtype->num_regs);
131	if (ret)
132		goto out_node_put;
133
134	pdata->num_leds = of_get_available_child_count(parent);
135
136	pdata->led = devm_kcalloc(dev, pdata->num_leds, sizeof(*pdata->led),
137				  GFP_KERNEL);
138	if (!pdata->led) {
139		ret = -ENOMEM;
140		goto out_node_put;
141	}
142
143	for_each_available_child_of_node(parent, child) {
144		const char *str;
145		u32 tmp;
146
147		if (of_property_read_u32(child, "reg", &tmp))
148			continue;
149		pdata->led[i].id = leds->devtype->led_min + tmp;
150
151		if (!of_property_read_string(child, "label", &str))
152			pdata->led[i].name = str;
153		if (!of_property_read_string(child, "linux,default-trigger",
154					     &str))
155			pdata->led[i].default_trigger = str;
156
157		i++;
158	}
159
160	pdata->num_leds = i;
161	ret = i > 0 ? 0 : -ENODATA;
162
163out_node_put:
164	of_node_put(parent);
165
166	return ret ? ERR_PTR(ret) : pdata;
167}
168#else
169static inline struct mc13xxx_leds_platform_data __init *mc13xxx_led_probe_dt(
170	struct platform_device *pdev)
171{
172	return ERR_PTR(-ENOSYS);
173}
174#endif
175
176static int __init mc13xxx_led_probe(struct platform_device *pdev)
177{
178	struct device *dev = &pdev->dev;
179	struct mc13xxx_leds_platform_data *pdata = dev_get_platdata(dev);
180	struct mc13xxx *mcdev = dev_get_drvdata(dev->parent);
181	struct mc13xxx_led_devtype *devtype =
182		(struct mc13xxx_led_devtype *)pdev->id_entry->driver_data;
183	struct mc13xxx_leds *leds;
184	int i, id, ret = -ENODATA;
185	u32 init_led = 0;
186
187	leds = devm_kzalloc(dev, sizeof(*leds), GFP_KERNEL);
188	if (!leds)
189		return -ENOMEM;
190
191	leds->devtype = devtype;
192	leds->master = mcdev;
193	platform_set_drvdata(pdev, leds);
194
195	if (dev_of_node(dev->parent)) {
196		pdata = mc13xxx_led_probe_dt(pdev);
197		if (IS_ERR(pdata))
198			return PTR_ERR(pdata);
199	} else if (!pdata)
200		return -ENODATA;
201
202	leds->num_leds = pdata->num_leds;
203
204	if ((leds->num_leds < 1) ||
205	    (leds->num_leds > (devtype->led_max - devtype->led_min + 1))) {
206		dev_err(dev, "Invalid LED count %d\n", leds->num_leds);
207		return -EINVAL;
208	}
209
210	leds->led = devm_kcalloc(dev, leds->num_leds, sizeof(*leds->led),
211				 GFP_KERNEL);
212	if (!leds->led)
213		return -ENOMEM;
214
215	for (i = 0; i < devtype->num_regs; i++) {
216		ret = mc13xxx_reg_write(mcdev, leds->devtype->ledctrl_base + i,
217					pdata->led_control[i]);
218		if (ret)
219			return ret;
220	}
221
222	for (i = 0; i < leds->num_leds; i++) {
223		const char *name, *trig;
224
225		ret = -EINVAL;
226
227		id = pdata->led[i].id;
228		name = pdata->led[i].name;
229		trig = pdata->led[i].default_trigger;
230
231		if ((id > devtype->led_max) || (id < devtype->led_min)) {
232			dev_err(dev, "Invalid ID %i\n", id);
233			break;
234		}
235
236		if (init_led & (1 << id)) {
237			dev_warn(dev, "LED %i already initialized\n", id);
238			break;
239		}
240
241		init_led |= 1 << id;
242		leds->led[i].id = id;
243		leds->led[i].leds = leds;
244		leds->led[i].cdev.name = name;
245		leds->led[i].cdev.default_trigger = trig;
246		leds->led[i].cdev.flags = LED_CORE_SUSPENDRESUME;
247		leds->led[i].cdev.brightness_set_blocking = mc13xxx_led_set;
248		leds->led[i].cdev.max_brightness = mc13xxx_max_brightness(id);
249
250		ret = led_classdev_register(dev->parent, &leds->led[i].cdev);
251		if (ret) {
252			dev_err(dev, "Failed to register LED %i\n", id);
253			break;
254		}
255	}
256
257	if (ret)
258		while (--i >= 0)
259			led_classdev_unregister(&leds->led[i].cdev);
260
261	return ret;
262}
263
264static void mc13xxx_led_remove(struct platform_device *pdev)
265{
266	struct mc13xxx_leds *leds = platform_get_drvdata(pdev);
267	int i;
268
269	for (i = 0; i < leds->num_leds; i++)
270		led_classdev_unregister(&leds->led[i].cdev);
271}
272
273static const struct mc13xxx_led_devtype mc13783_led_devtype = {
274	.led_min	= MC13783_LED_MD,
275	.led_max	= MC13783_LED_B3,
276	.num_regs	= 6,
277	.ledctrl_base	= 51,
278};
279
280static const struct mc13xxx_led_devtype mc13892_led_devtype = {
281	.led_min	= MC13892_LED_MD,
282	.led_max	= MC13892_LED_B,
283	.num_regs	= 4,
284	.ledctrl_base	= 51,
285};
286
287static const struct mc13xxx_led_devtype mc34708_led_devtype = {
288	.led_min	= MC34708_LED_R,
289	.led_max	= MC34708_LED_G,
290	.num_regs	= 1,
291	.ledctrl_base	= 54,
292};
293
294static const struct platform_device_id mc13xxx_led_id_table[] = {
295	{ "mc13783-led", (kernel_ulong_t)&mc13783_led_devtype, },
296	{ "mc13892-led", (kernel_ulong_t)&mc13892_led_devtype, },
297	{ "mc34708-led", (kernel_ulong_t)&mc34708_led_devtype, },
298	{ }
299};
300MODULE_DEVICE_TABLE(platform, mc13xxx_led_id_table);
301
302static struct platform_driver mc13xxx_led_driver = {
303	.driver	= {
304		.name	= "mc13xxx-led",
305	},
306	.remove_new	= mc13xxx_led_remove,
307	.id_table	= mc13xxx_led_id_table,
308};
309module_platform_driver_probe(mc13xxx_led_driver, mc13xxx_led_probe);
310
311MODULE_DESCRIPTION("LEDs driver for Freescale MC13XXX PMIC");
312MODULE_AUTHOR("Philippe Retornaz <philippe.retornaz@epfl.ch>");
313MODULE_LICENSE("GPL");
314