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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                 reg = (led->id - MC13892_LED_MD) / 2;
 88                 shift = 3 + (led->id - MC13892_LED_MD) * 12;
 89                 break;
 90         case MC13892_LED_R:
 91         case MC13892_LED_G:
 92         case MC13892_LED_B:
 93                 off = led->id - MC13892_LED_R;
 94                 bank = off / 2;
 95                 reg = 2 + bank;
 96                 shift = (off - bank * 2) * 12 + 3;
 97                 break;
 98         case MC34708_LED_R:
 99         case MC34708_LED_G:
100                 reg = 0;
101                 shift = 3 + (led->id - MC34708_LED_R) * 12;
102                 break;
103         default:
104                 BUG();
105         }
106 
107         return mc13xxx_reg_rmw(leds->master, leds->devtype->ledctrl_base + reg,
108                         mc13xxx_max_brightness(led->id) << shift,
109                         value << shift);
110 }
111 
112 #ifdef CONFIG_OF
113 static struct mc13xxx_leds_platform_data __init *mc13xxx_led_probe_dt(
114         struct platform_device *pdev)
115 {
116         struct mc13xxx_leds *leds = platform_get_drvdata(pdev);
117         struct mc13xxx_leds_platform_data *pdata;
118         struct device_node *parent, *child;
119         struct device *dev = &pdev->dev;
120         int i = 0, ret = -ENODATA;
121 
122         pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
123         if (!pdata)
124                 return ERR_PTR(-ENOMEM);
125 
126         parent = of_get_child_by_name(dev->parent->of_node, "leds");
127         if (!parent)
128                 goto out_node_put;
129 
130         ret = of_property_read_u32_array(parent, "led-control",
131                                          pdata->led_control,
132                                          leds->devtype->num_regs);
133         if (ret)
134                 goto out_node_put;
135 
136         pdata->num_leds = of_get_child_count(parent);
137 
138         pdata->led = devm_kzalloc(dev, pdata->num_leds * sizeof(*pdata->led),
139                                   GFP_KERNEL);
140         if (!pdata->led) {
141                 ret = -ENOMEM;
142                 goto out_node_put;
143         }
144 
145         for_each_child_of_node(parent, child) {
146                 const char *str;
147                 u32 tmp;
148 
149                 if (of_property_read_u32(child, "reg", &tmp))
150                         continue;
151                 pdata->led[i].id = leds->devtype->led_min + tmp;
152 
153                 if (!of_property_read_string(child, "label", &str))
154                         pdata->led[i].name = str;
155                 if (!of_property_read_string(child, "linux,default-trigger",
156                                              &str))
157                         pdata->led[i].default_trigger = str;
158 
159                 i++;
160         }
161 
162         pdata->num_leds = i;
163         ret = i > 0 ? 0 : -ENODATA;
164 
165 out_node_put:
166         of_node_put(parent);
167 
168         return ret ? ERR_PTR(ret) : pdata;
169 }
170 #else
171 static inline struct mc13xxx_leds_platform_data __init *mc13xxx_led_probe_dt(
172         struct platform_device *pdev)
173 {
174         return ERR_PTR(-ENOSYS);
175 }
176 #endif
177 
178 static int __init mc13xxx_led_probe(struct platform_device *pdev)
179 {
180         struct device *dev = &pdev->dev;
181         struct mc13xxx_leds_platform_data *pdata = dev_get_platdata(dev);
182         struct mc13xxx *mcdev = dev_get_drvdata(dev->parent);
183         struct mc13xxx_led_devtype *devtype =
184                 (struct mc13xxx_led_devtype *)pdev->id_entry->driver_data;
185         struct mc13xxx_leds *leds;
186         int i, id, ret = -ENODATA;
187         u32 init_led = 0;
188 
189         leds = devm_kzalloc(dev, sizeof(*leds), GFP_KERNEL);
190         if (!leds)
191                 return -ENOMEM;
192 
193         leds->devtype = devtype;
194         leds->master = mcdev;
195         platform_set_drvdata(pdev, leds);
196 
197         if (dev->parent->of_node) {
198                 pdata = mc13xxx_led_probe_dt(pdev);
199                 if (IS_ERR(pdata))
200                         return PTR_ERR(pdata);
201         } else if (!pdata)
202                 return -ENODATA;
203 
204         leds->num_leds = pdata->num_leds;
205 
206         if ((leds->num_leds < 1) ||
207             (leds->num_leds > (devtype->led_max - devtype->led_min + 1))) {
208                 dev_err(dev, "Invalid LED count %d\n", leds->num_leds);
209                 return -EINVAL;
210         }
211 
212         leds->led = devm_kzalloc(dev, leds->num_leds * sizeof(*leds->led),
213                                  GFP_KERNEL);
214         if (!leds->led)
215                 return -ENOMEM;
216 
217         for (i = 0; i < devtype->num_regs; i++) {
218                 ret = mc13xxx_reg_write(mcdev, leds->devtype->ledctrl_base + i,
219                                         pdata->led_control[i]);
220                 if (ret)
221                         return ret;
222         }
223 
224         for (i = 0; i < leds->num_leds; i++) {
225                 const char *name, *trig;
226 
227                 ret = -EINVAL;
228 
229                 id = pdata->led[i].id;
230                 name = pdata->led[i].name;
231                 trig = pdata->led[i].default_trigger;
232 
233                 if ((id > devtype->led_max) || (id < devtype->led_min)) {
234                         dev_err(dev, "Invalid ID %i\n", id);
235                         break;
236                 }
237 
238                 if (init_led & (1 << id)) {
239                         dev_warn(dev, "LED %i already initialized\n", id);
240                         break;
241                 }
242 
243                 init_led |= 1 << id;
244                 leds->led[i].id = id;
245                 leds->led[i].leds = leds;
246                 leds->led[i].cdev.name = name;
247                 leds->led[i].cdev.default_trigger = trig;
248                 leds->led[i].cdev.flags = LED_CORE_SUSPENDRESUME;
249                 leds->led[i].cdev.brightness_set_blocking = mc13xxx_led_set;
250                 leds->led[i].cdev.max_brightness = mc13xxx_max_brightness(id);
251 
252                 ret = led_classdev_register(dev->parent, &leds->led[i].cdev);
253                 if (ret) {
254                         dev_err(dev, "Failed to register LED %i\n", id);
255                         break;
256                 }
257         }
258 
259         if (ret)
260                 while (--i >= 0)
261                         led_classdev_unregister(&leds->led[i].cdev);
262 
263         return ret;
264 }
265 
266 static int mc13xxx_led_remove(struct platform_device *pdev)
267 {
268         struct mc13xxx_leds *leds = platform_get_drvdata(pdev);
269         int i;
270 
271         for (i = 0; i < leds->num_leds; i++)
272                 led_classdev_unregister(&leds->led[i].cdev);
273 
274         return 0;
275 }
276 
277 static const struct mc13xxx_led_devtype mc13783_led_devtype = {
278         .led_min        = MC13783_LED_MD,
279         .led_max        = MC13783_LED_B3,
280         .num_regs       = 6,
281         .ledctrl_base   = 51,
282 };
283 
284 static const struct mc13xxx_led_devtype mc13892_led_devtype = {
285         .led_min        = MC13892_LED_MD,
286         .led_max        = MC13892_LED_B,
287         .num_regs       = 4,
288         .ledctrl_base   = 51,
289 };
290 
291 static const struct mc13xxx_led_devtype mc34708_led_devtype = {
292         .led_min        = MC34708_LED_R,
293         .led_max        = MC34708_LED_G,
294         .num_regs       = 1,
295         .ledctrl_base   = 54,
296 };
297 
298 static const struct platform_device_id mc13xxx_led_id_table[] = {
299         { "mc13783-led", (kernel_ulong_t)&mc13783_led_devtype, },
300         { "mc13892-led", (kernel_ulong_t)&mc13892_led_devtype, },
301         { "mc34708-led", (kernel_ulong_t)&mc34708_led_devtype, },
302         { }
303 };
304 MODULE_DEVICE_TABLE(platform, mc13xxx_led_id_table);
305 
306 static struct platform_driver mc13xxx_led_driver = {
307         .driver = {
308                 .name   = "mc13xxx-led",
309         },
310         .remove         = mc13xxx_led_remove,
311         .id_table       = mc13xxx_led_id_table,
312 };
313 module_platform_driver_probe(mc13xxx_led_driver, mc13xxx_led_probe);
314 
315 MODULE_DESCRIPTION("LEDs driver for Freescale MC13XXX PMIC");
316 MODULE_AUTHOR("Philippe Retornaz <philippe.retornaz@epfl.ch>");
317 MODULE_LICENSE("GPL");
318 

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