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/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 
22 struct mc13xxx_led_devtype {
23 	int	led_min;
24 	int	led_max;
25 	int	num_regs;
26 	u32	ledctrl_base;
27 };
28 
29 struct mc13xxx_led {
30 	struct led_classdev	cdev;
31 	int			id;
32 	struct mc13xxx_leds	*leds;
33 };
34 
35 struct mc13xxx_leds {
36 	struct mc13xxx			*master;
37 	struct mc13xxx_led_devtype	*devtype;
38 	int				num_leds;
39 	struct mc13xxx_led		*led;
40 };
41 
mc13xxx_max_brightness(int id)42 static 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 
mc13xxx_led_set(struct led_classdev * led_cdev,enum led_brightness value)52 static 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
mc13xxx_led_probe_dt(struct platform_device * pdev)111 static 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 
163 out_node_put:
164 	of_node_put(parent);
165 
166 	return ret ? ERR_PTR(ret) : pdata;
167 }
168 #else
mc13xxx_led_probe_dt(struct platform_device * pdev)169 static 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 
mc13xxx_led_probe(struct platform_device * pdev)176 static 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 
mc13xxx_led_remove(struct platform_device * pdev)264 static int 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 	return 0;
273 }
274 
275 static const struct mc13xxx_led_devtype mc13783_led_devtype = {
276 	.led_min	= MC13783_LED_MD,
277 	.led_max	= MC13783_LED_B3,
278 	.num_regs	= 6,
279 	.ledctrl_base	= 51,
280 };
281 
282 static const struct mc13xxx_led_devtype mc13892_led_devtype = {
283 	.led_min	= MC13892_LED_MD,
284 	.led_max	= MC13892_LED_B,
285 	.num_regs	= 4,
286 	.ledctrl_base	= 51,
287 };
288 
289 static const struct mc13xxx_led_devtype mc34708_led_devtype = {
290 	.led_min	= MC34708_LED_R,
291 	.led_max	= MC34708_LED_G,
292 	.num_regs	= 1,
293 	.ledctrl_base	= 54,
294 };
295 
296 static const struct platform_device_id mc13xxx_led_id_table[] = {
297 	{ "mc13783-led", (kernel_ulong_t)&mc13783_led_devtype, },
298 	{ "mc13892-led", (kernel_ulong_t)&mc13892_led_devtype, },
299 	{ "mc34708-led", (kernel_ulong_t)&mc34708_led_devtype, },
300 	{ }
301 };
302 MODULE_DEVICE_TABLE(platform, mc13xxx_led_id_table);
303 
304 static struct platform_driver mc13xxx_led_driver = {
305 	.driver	= {
306 		.name	= "mc13xxx-led",
307 	},
308 	.remove		= mc13xxx_led_remove,
309 	.id_table	= mc13xxx_led_id_table,
310 };
311 module_platform_driver_probe(mc13xxx_led_driver, mc13xxx_led_probe);
312 
313 MODULE_DESCRIPTION("LEDs driver for Freescale MC13XXX PMIC");
314 MODULE_AUTHOR("Philippe Retornaz <philippe.retornaz@epfl.ch>");
315 MODULE_LICENSE("GPL");
316