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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/mfd/mc13xxx.h>
 24 
 25 struct mc13xxx_led_devtype {
 26         int     led_min;
 27         int     led_max;
 28         int     num_regs;
 29         u32     ledctrl_base;
 30 };
 31 
 32 struct mc13xxx_led {
 33         struct led_classdev     cdev;
 34         int                     id;
 35         struct mc13xxx_leds     *leds;
 36 };
 37 
 38 struct mc13xxx_leds {
 39         struct mc13xxx                  *master;
 40         struct mc13xxx_led_devtype      *devtype;
 41         int                             num_leds;
 42         struct mc13xxx_led              *led;
 43 };
 44 
 45 static unsigned int mc13xxx_max_brightness(int id)
 46 {
 47         if (id >= MC13783_LED_MD && id <= MC13783_LED_KP)
 48                 return 0x0f;
 49         else if (id >= MC13783_LED_R1 && id <= MC13783_LED_B3)
 50                 return 0x1f;
 51 
 52         return 0x3f;
 53 }
 54 
 55 static int mc13xxx_led_set(struct led_classdev *led_cdev,
 56                             enum led_brightness value)
 57 {
 58         struct mc13xxx_led *led =
 59                 container_of(led_cdev, struct mc13xxx_led, cdev);
 60         struct mc13xxx_leds *leds = led->leds;
 61         unsigned int reg, bank, off, shift;
 62 
 63         switch (led->id) {
 64         case MC13783_LED_MD:
 65         case MC13783_LED_AD:
 66         case MC13783_LED_KP:
 67                 reg = 2;
 68                 shift = 9 + (led->id - MC13783_LED_MD) * 4;
 69                 break;
 70         case MC13783_LED_R1:
 71         case MC13783_LED_G1:
 72         case MC13783_LED_B1:
 73         case MC13783_LED_R2:
 74         case MC13783_LED_G2:
 75         case MC13783_LED_B2:
 76         case MC13783_LED_R3:
 77         case MC13783_LED_G3:
 78         case MC13783_LED_B3:
 79                 off = led->id - MC13783_LED_R1;
 80                 bank = off / 3;
 81                 reg = 3 + bank;
 82                 shift = (off - bank * 3) * 5 + 6;
 83                 break;
 84         case MC13892_LED_MD:
 85         case MC13892_LED_AD:
 86         case MC13892_LED_KP:
 87                 off = led->id - MC13892_LED_MD;
 88                 reg = off / 2;
 89                 shift = 3 + (off - reg * 2) * 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         return mc13xxx_reg_rmw(leds->master, leds->devtype->ledctrl_base + reg,
109                         mc13xxx_max_brightness(led->id) << shift,
110                         value << shift);
111 }
112 
113 #ifdef CONFIG_OF
114 static struct mc13xxx_leds_platform_data __init *mc13xxx_led_probe_dt(
115         struct platform_device *pdev)
116 {
117         struct mc13xxx_leds *leds = platform_get_drvdata(pdev);
118         struct mc13xxx_leds_platform_data *pdata;
119         struct device_node *parent, *child;
120         struct device *dev = &pdev->dev;
121         int i = 0, ret = -ENODATA;
122 
123         pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
124         if (!pdata)
125                 return ERR_PTR(-ENOMEM);
126 
127         parent = of_get_child_by_name(dev->parent->of_node, "leds");
128         if (!parent)
129                 goto out_node_put;
130 
131         ret = of_property_read_u32_array(parent, "led-control",
132                                          pdata->led_control,
133                                          leds->devtype->num_regs);
134         if (ret)
135                 goto out_node_put;
136 
137         pdata->num_leds = of_get_child_count(parent);
138 
139         pdata->led = devm_kzalloc(dev, pdata->num_leds * sizeof(*pdata->led),
140                                   GFP_KERNEL);
141         if (!pdata->led) {
142                 ret = -ENOMEM;
143                 goto out_node_put;
144         }
145 
146         for_each_child_of_node(parent, child) {
147                 const char *str;
148                 u32 tmp;
149 
150                 if (of_property_read_u32(child, "reg", &tmp))
151                         continue;
152                 pdata->led[i].id = leds->devtype->led_min + tmp;
153 
154                 if (!of_property_read_string(child, "label", &str))
155                         pdata->led[i].name = str;
156                 if (!of_property_read_string(child, "linux,default-trigger",
157                                              &str))
158                         pdata->led[i].default_trigger = str;
159 
160                 i++;
161         }
162 
163         pdata->num_leds = i;
164         ret = i > 0 ? 0 : -ENODATA;
165 
166 out_node_put:
167         of_node_put(parent);
168 
169         return ret ? ERR_PTR(ret) : pdata;
170 }
171 #else
172 static inline struct mc13xxx_leds_platform_data __init *mc13xxx_led_probe_dt(
173         struct platform_device *pdev)
174 {
175         return ERR_PTR(-ENOSYS);
176 }
177 #endif
178 
179 static int __init mc13xxx_led_probe(struct platform_device *pdev)
180 {
181         struct device *dev = &pdev->dev;
182         struct mc13xxx_leds_platform_data *pdata = dev_get_platdata(dev);
183         struct mc13xxx *mcdev = dev_get_drvdata(dev->parent);
184         struct mc13xxx_led_devtype *devtype =
185                 (struct mc13xxx_led_devtype *)pdev->id_entry->driver_data;
186         struct mc13xxx_leds *leds;
187         int i, id, ret = -ENODATA;
188         u32 init_led = 0;
189 
190         leds = devm_kzalloc(dev, sizeof(*leds), GFP_KERNEL);
191         if (!leds)
192                 return -ENOMEM;
193 
194         leds->devtype = devtype;
195         leds->master = mcdev;
196         platform_set_drvdata(pdev, leds);
197 
198         if (dev->parent->of_node) {
199                 pdata = mc13xxx_led_probe_dt(pdev);
200                 if (IS_ERR(pdata))
201                         return PTR_ERR(pdata);
202         } else if (!pdata)
203                 return -ENODATA;
204 
205         leds->num_leds = pdata->num_leds;
206 
207         if ((leds->num_leds < 1) ||
208             (leds->num_leds > (devtype->led_max - devtype->led_min + 1))) {
209                 dev_err(dev, "Invalid LED count %d\n", leds->num_leds);
210                 return -EINVAL;
211         }
212 
213         leds->led = devm_kzalloc(dev, leds->num_leds * sizeof(*leds->led),
214                                  GFP_KERNEL);
215         if (!leds->led)
216                 return -ENOMEM;
217 
218         for (i = 0; i < devtype->num_regs; i++) {
219                 ret = mc13xxx_reg_write(mcdev, leds->devtype->ledctrl_base + i,
220                                         pdata->led_control[i]);
221                 if (ret)
222                         return ret;
223         }
224 
225         for (i = 0; i < leds->num_leds; i++) {
226                 const char *name, *trig;
227 
228                 ret = -EINVAL;
229 
230                 id = pdata->led[i].id;
231                 name = pdata->led[i].name;
232                 trig = pdata->led[i].default_trigger;
233 
234                 if ((id > devtype->led_max) || (id < devtype->led_min)) {
235                         dev_err(dev, "Invalid ID %i\n", id);
236                         break;
237                 }
238 
239                 if (init_led & (1 << id)) {
240                         dev_warn(dev, "LED %i already initialized\n", id);
241                         break;
242                 }
243 
244                 init_led |= 1 << id;
245                 leds->led[i].id = id;
246                 leds->led[i].leds = leds;
247                 leds->led[i].cdev.name = name;
248                 leds->led[i].cdev.default_trigger = trig;
249                 leds->led[i].cdev.flags = LED_CORE_SUSPENDRESUME;
250                 leds->led[i].cdev.brightness_set_blocking = mc13xxx_led_set;
251                 leds->led[i].cdev.max_brightness = mc13xxx_max_brightness(id);
252 
253                 ret = led_classdev_register(dev->parent, &leds->led[i].cdev);
254                 if (ret) {
255                         dev_err(dev, "Failed to register LED %i\n", id);
256                         break;
257                 }
258         }
259 
260         if (ret)
261                 while (--i >= 0)
262                         led_classdev_unregister(&leds->led[i].cdev);
263 
264         return ret;
265 }
266 
267 static int mc13xxx_led_remove(struct platform_device *pdev)
268 {
269         struct mc13xxx_leds *leds = platform_get_drvdata(pdev);
270         int i;
271 
272         for (i = 0; i < leds->num_leds; i++)
273                 led_classdev_unregister(&leds->led[i].cdev);
274 
275         return 0;
276 }
277 
278 static const struct mc13xxx_led_devtype mc13783_led_devtype = {
279         .led_min        = MC13783_LED_MD,
280         .led_max        = MC13783_LED_B3,
281         .num_regs       = 6,
282         .ledctrl_base   = 51,
283 };
284 
285 static const struct mc13xxx_led_devtype mc13892_led_devtype = {
286         .led_min        = MC13892_LED_MD,
287         .led_max        = MC13892_LED_B,
288         .num_regs       = 4,
289         .ledctrl_base   = 51,
290 };
291 
292 static const struct mc13xxx_led_devtype mc34708_led_devtype = {
293         .led_min        = MC34708_LED_R,
294         .led_max        = MC34708_LED_G,
295         .num_regs       = 1,
296         .ledctrl_base   = 54,
297 };
298 
299 static const struct platform_device_id mc13xxx_led_id_table[] = {
300         { "mc13783-led", (kernel_ulong_t)&mc13783_led_devtype, },
301         { "mc13892-led", (kernel_ulong_t)&mc13892_led_devtype, },
302         { "mc34708-led", (kernel_ulong_t)&mc34708_led_devtype, },
303         { }
304 };
305 MODULE_DEVICE_TABLE(platform, mc13xxx_led_id_table);
306 
307 static struct platform_driver mc13xxx_led_driver = {
308         .driver = {
309                 .name   = "mc13xxx-led",
310         },
311         .remove         = mc13xxx_led_remove,
312         .id_table       = mc13xxx_led_id_table,
313 };
314 module_platform_driver_probe(mc13xxx_led_driver, mc13xxx_led_probe);
315 
316 MODULE_DESCRIPTION("LEDs driver for Freescale MC13XXX PMIC");
317 MODULE_AUTHOR("Philippe Retornaz <philippe.retornaz@epfl.ch>");
318 MODULE_LICENSE("GPL");
319 

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