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