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Linux/drivers/leds/leds-mc13783.c

  1 /*
  2  * LEDs driver for Freescale MC13783/MC13892/MC34708
  3  *
  4  * Copyright (C) 2010 Philippe R├ętornaz
  5  *
  6  * Based on leds-da903x:
  7  * Copyright (C) 2008 Compulab, Ltd.
  8  *      Mike Rapoport <mike@compulab.co.il>
  9  *
 10  * Copyright (C) 2006-2008 Marvell International Ltd.
 11  *      Eric Miao <eric.miao@marvell.com>
 12  *
 13  * This program is free software; you can redistribute it and/or modify
 14  * it under the terms of the GNU General Public License version 2 as
 15  * published by the Free Software Foundation.
 16  */
 17 
 18 #include <linux/module.h>
 19 #include <linux/kernel.h>
 20 #include <linux/platform_device.h>
 21 #include <linux/leds.h>
 22 #include <linux/of.h>
 23 #include <linux/workqueue.h>
 24 #include <linux/mfd/mc13xxx.h>
 25 
 26 struct mc13xxx_led_devtype {
 27         int     led_min;
 28         int     led_max;
 29         int     num_regs;
 30         u32     ledctrl_base;
 31 };
 32 
 33 struct mc13xxx_led {
 34         struct led_classdev     cdev;
 35         struct work_struct      work;
 36         enum led_brightness     new_brightness;
 37         int                     id;
 38         struct mc13xxx_leds     *leds;
 39 };
 40 
 41 struct mc13xxx_leds {
 42         struct mc13xxx                  *master;
 43         struct mc13xxx_led_devtype      *devtype;
 44         int                             num_leds;
 45         struct mc13xxx_led              *led;
 46 };
 47 
 48 static unsigned int mc13xxx_max_brightness(int id)
 49 {
 50         if (id >= MC13783_LED_MD && id <= MC13783_LED_KP)
 51                 return 0x0f;
 52         else if (id >= MC13783_LED_R1 && id <= MC13783_LED_B3)
 53                 return 0x1f;
 54 
 55         return 0x3f;
 56 }
 57 
 58 static void mc13xxx_led_work(struct work_struct *work)
 59 {
 60         struct mc13xxx_led *led = container_of(work, struct mc13xxx_led, work);
 61         struct mc13xxx_leds *leds = led->leds;
 62         unsigned int reg, bank, off, shift;
 63 
 64         switch (led->id) {
 65         case MC13783_LED_MD:
 66         case MC13783_LED_AD:
 67         case MC13783_LED_KP:
 68                 reg = 2;
 69                 shift = 9 + (led->id - MC13783_LED_MD) * 4;
 70                 break;
 71         case MC13783_LED_R1:
 72         case MC13783_LED_G1:
 73         case MC13783_LED_B1:
 74         case MC13783_LED_R2:
 75         case MC13783_LED_G2:
 76         case MC13783_LED_B2:
 77         case MC13783_LED_R3:
 78         case MC13783_LED_G3:
 79         case MC13783_LED_B3:
 80                 off = led->id - MC13783_LED_R1;
 81                 bank = off / 3;
 82                 reg = 3 + bank;
 83                 shift = (off - bank * 3) * 5 + 6;
 84                 break;
 85         case MC13892_LED_MD:
 86         case MC13892_LED_AD:
 87         case MC13892_LED_KP:
 88                 reg = (led->id - MC13892_LED_MD) / 2;
 89                 shift = 3 + (led->id - MC13892_LED_MD) * 12;
 90                 break;
 91         case MC13892_LED_R:
 92         case MC13892_LED_G:
 93         case MC13892_LED_B:
 94                 off = led->id - MC13892_LED_R;
 95                 bank = off / 2;
 96                 reg = 2 + bank;
 97                 shift = (off - bank * 2) * 12 + 3;
 98                 break;
 99         case MC34708_LED_R:
100         case MC34708_LED_G:
101                 reg = 0;
102                 shift = 3 + (led->id - MC34708_LED_R) * 12;
103                 break;
104         default:
105                 BUG();
106         }
107 
108         mc13xxx_reg_rmw(leds->master, leds->devtype->ledctrl_base + reg,
109                         mc13xxx_max_brightness(led->id) << shift,
110                         led->new_brightness << shift);
111 }
112 
113 static void mc13xxx_led_set(struct led_classdev *led_cdev,
114                             enum led_brightness value)
115 {
116         struct mc13xxx_led *led =
117                 container_of(led_cdev, struct mc13xxx_led, cdev);
118 
119         led->new_brightness = value;
120         schedule_work(&led->work);
121 }
122 
123 #ifdef CONFIG_OF
124 static struct mc13xxx_leds_platform_data __init *mc13xxx_led_probe_dt(
125         struct platform_device *pdev)
126 {
127         struct mc13xxx_leds *leds = platform_get_drvdata(pdev);
128         struct mc13xxx_leds_platform_data *pdata;
129         struct device_node *parent, *child;
130         struct device *dev = &pdev->dev;
131         int i = 0, ret = -ENODATA;
132 
133         pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
134         if (!pdata)
135                 return ERR_PTR(-ENOMEM);
136 
137         of_node_get(dev->parent->of_node);
138 
139         parent = of_find_node_by_name(dev->parent->of_node, "leds");
140         if (!parent)
141                 goto out_node_put;
142 
143         ret = of_property_read_u32_array(parent, "led-control",
144                                          pdata->led_control,
145                                          leds->devtype->num_regs);
146         if (ret)
147                 goto out_node_put;
148 
149         pdata->num_leds = of_get_child_count(parent);
150 
151         pdata->led = devm_kzalloc(dev, pdata->num_leds * sizeof(*pdata->led),
152                                   GFP_KERNEL);
153         if (!pdata->led) {
154                 ret = -ENOMEM;
155                 goto out_node_put;
156         }
157 
158         for_each_child_of_node(parent, child) {
159                 const char *str;
160                 u32 tmp;
161 
162                 if (of_property_read_u32(child, "reg", &tmp))
163                         continue;
164                 pdata->led[i].id = leds->devtype->led_min + tmp;
165 
166                 if (!of_property_read_string(child, "label", &str))
167                         pdata->led[i].name = str;
168                 if (!of_property_read_string(child, "linux,default-trigger",
169                                              &str))
170                         pdata->led[i].default_trigger = str;
171 
172                 i++;
173         }
174 
175         pdata->num_leds = i;
176         ret = i > 0 ? 0 : -ENODATA;
177 
178 out_node_put:
179         of_node_put(parent);
180 
181         return ret ? ERR_PTR(ret) : pdata;
182 }
183 #else
184 static inline struct mc13xxx_leds_platform_data __init *mc13xxx_led_probe_dt(
185         struct platform_device *pdev)
186 {
187         return ERR_PTR(-ENOSYS);
188 }
189 #endif
190 
191 static int __init mc13xxx_led_probe(struct platform_device *pdev)
192 {
193         struct device *dev = &pdev->dev;
194         struct mc13xxx_leds_platform_data *pdata = dev_get_platdata(dev);
195         struct mc13xxx *mcdev = dev_get_drvdata(dev->parent);
196         struct mc13xxx_led_devtype *devtype =
197                 (struct mc13xxx_led_devtype *)pdev->id_entry->driver_data;
198         struct mc13xxx_leds *leds;
199         int i, id, ret = -ENODATA;
200         u32 init_led = 0;
201 
202         leds = devm_kzalloc(dev, sizeof(*leds), GFP_KERNEL);
203         if (!leds)
204                 return -ENOMEM;
205 
206         leds->devtype = devtype;
207         leds->master = mcdev;
208         platform_set_drvdata(pdev, leds);
209 
210         if (dev->parent->of_node) {
211                 pdata = mc13xxx_led_probe_dt(pdev);
212                 if (IS_ERR(pdata))
213                         return PTR_ERR(pdata);
214         } else if (!pdata)
215                 return -ENODATA;
216 
217         leds->num_leds = pdata->num_leds;
218 
219         if ((leds->num_leds < 1) ||
220             (leds->num_leds > (devtype->led_max - devtype->led_min + 1))) {
221                 dev_err(dev, "Invalid LED count %d\n", leds->num_leds);
222                 return -EINVAL;
223         }
224 
225         leds->led = devm_kzalloc(dev, leds->num_leds * sizeof(*leds->led),
226                                  GFP_KERNEL);
227         if (!leds->led)
228                 return -ENOMEM;
229 
230         for (i = 0; i < devtype->num_regs; i++) {
231                 ret = mc13xxx_reg_write(mcdev, leds->devtype->ledctrl_base + i,
232                                         pdata->led_control[i]);
233                 if (ret)
234                         return ret;
235         }
236 
237         for (i = 0; i < leds->num_leds; i++) {
238                 const char *name, *trig;
239 
240                 ret = -EINVAL;
241 
242                 id = pdata->led[i].id;
243                 name = pdata->led[i].name;
244                 trig = pdata->led[i].default_trigger;
245 
246                 if ((id > devtype->led_max) || (id < devtype->led_min)) {
247                         dev_err(dev, "Invalid ID %i\n", id);
248                         break;
249                 }
250 
251                 if (init_led & (1 << id)) {
252                         dev_warn(dev, "LED %i already initialized\n", id);
253                         break;
254                 }
255 
256                 init_led |= 1 << id;
257                 leds->led[i].id = id;
258                 leds->led[i].leds = leds;
259                 leds->led[i].cdev.name = name;
260                 leds->led[i].cdev.default_trigger = trig;
261                 leds->led[i].cdev.flags = LED_CORE_SUSPENDRESUME;
262                 leds->led[i].cdev.brightness_set = mc13xxx_led_set;
263                 leds->led[i].cdev.max_brightness = mc13xxx_max_brightness(id);
264 
265                 INIT_WORK(&leds->led[i].work, mc13xxx_led_work);
266 
267                 ret = led_classdev_register(dev->parent, &leds->led[i].cdev);
268                 if (ret) {
269                         dev_err(dev, "Failed to register LED %i\n", id);
270                         break;
271                 }
272         }
273 
274         if (ret)
275                 while (--i >= 0) {
276                         led_classdev_unregister(&leds->led[i].cdev);
277                         cancel_work_sync(&leds->led[i].work);
278                 }
279 
280         return ret;
281 }
282 
283 static int mc13xxx_led_remove(struct platform_device *pdev)
284 {
285         struct mc13xxx_leds *leds = platform_get_drvdata(pdev);
286         int i;
287 
288         for (i = 0; i < leds->num_leds; i++) {
289                 led_classdev_unregister(&leds->led[i].cdev);
290                 cancel_work_sync(&leds->led[i].work);
291         }
292 
293         return 0;
294 }
295 
296 static const struct mc13xxx_led_devtype mc13783_led_devtype = {
297         .led_min        = MC13783_LED_MD,
298         .led_max        = MC13783_LED_B3,
299         .num_regs       = 6,
300         .ledctrl_base   = 51,
301 };
302 
303 static const struct mc13xxx_led_devtype mc13892_led_devtype = {
304         .led_min        = MC13892_LED_MD,
305         .led_max        = MC13892_LED_B,
306         .num_regs       = 4,
307         .ledctrl_base   = 51,
308 };
309 
310 static const struct mc13xxx_led_devtype mc34708_led_devtype = {
311         .led_min        = MC34708_LED_R,
312         .led_max        = MC34708_LED_G,
313         .num_regs       = 1,
314         .ledctrl_base   = 54,
315 };
316 
317 static const struct platform_device_id mc13xxx_led_id_table[] = {
318         { "mc13783-led", (kernel_ulong_t)&mc13783_led_devtype, },
319         { "mc13892-led", (kernel_ulong_t)&mc13892_led_devtype, },
320         { "mc34708-led", (kernel_ulong_t)&mc34708_led_devtype, },
321         { }
322 };
323 MODULE_DEVICE_TABLE(platform, mc13xxx_led_id_table);
324 
325 static struct platform_driver mc13xxx_led_driver = {
326         .driver = {
327                 .name   = "mc13xxx-led",
328                 .owner  = THIS_MODULE,
329         },
330         .remove         = mc13xxx_led_remove,
331         .id_table       = mc13xxx_led_id_table,
332 };
333 module_platform_driver_probe(mc13xxx_led_driver, mc13xxx_led_probe);
334 
335 MODULE_DESCRIPTION("LEDs driver for Freescale MC13XXX PMIC");
336 MODULE_AUTHOR("Philippe Retornaz <philippe.retornaz@epfl.ch>");
337 MODULE_LICENSE("GPL");
338 

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