leds-mc13783.c

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