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Philippe Rétornaz7fdcef82010-05-19 09:24:31 +02001/*
Alexander Shiyana59ce652014-01-31 22:36:28 -08002 * LEDs driver for Freescale MC13783/MC13892/MC34708
Philippe Rétornaz7fdcef82010-05-19 09:24:31 +02003 *
4 * Copyright (C) 2010 Philippe Rétornaz
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>
Philippe Rétornaz7fdcef82010-05-19 09:24:31 +020020#include <linux/platform_device.h>
21#include <linux/leds.h>
Alexander Shiyan25c65792014-01-31 22:37:23 -080022#include <linux/of.h>
Philippe Rétornaz7fdcef82010-05-19 09:24:31 +020023#include <linux/workqueue.h>
David Janderf3ca0782011-08-24 15:28:20 +020024#include <linux/mfd/mc13xxx.h>
Philippe Rétornaz7fdcef82010-05-19 09:24:31 +020025
Alexander Shiyan9d2638132013-06-10 09:59:30 -070026struct mc13xxx_led_devtype {
27 int led_min;
28 int led_max;
29 int num_regs;
Alexander Shiyana59ce652014-01-31 22:36:28 -080030 u32 ledctrl_base;
Alexander Shiyan9d2638132013-06-10 09:59:30 -070031};
32
33struct mc13xxx_led {
Philippe Rétornaz7fdcef82010-05-19 09:24:31 +020034 struct led_classdev cdev;
35 struct work_struct work;
Philippe Rétornaz7fdcef82010-05-19 09:24:31 +020036 enum led_brightness new_brightness;
37 int id;
Alexander Shiyana59ce652014-01-31 22:36:28 -080038 struct mc13xxx_leds *leds;
Philippe Rétornaz7fdcef82010-05-19 09:24:31 +020039};
40
Alexander Shiyan9d2638132013-06-10 09:59:30 -070041struct mc13xxx_leds {
Alexander Shiyana59ce652014-01-31 22:36:28 -080042 struct mc13xxx *master;
Alexander Shiyan9d2638132013-06-10 09:59:30 -070043 struct mc13xxx_led_devtype *devtype;
44 int num_leds;
Alexander Shiyan25c65792014-01-31 22:37:23 -080045 struct mc13xxx_led *led;
Alexander Shiyan9d2638132013-06-10 09:59:30 -070046};
Philippe Rétornaz7fdcef82010-05-19 09:24:31 +020047
Alexander Shiyan677d13f2014-01-31 22:36:30 -080048static 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
Alexander Shiyan9d2638132013-06-10 09:59:30 -070058static void mc13xxx_led_work(struct work_struct *work)
Philippe Rétornaz7fdcef82010-05-19 09:24:31 +020059{
Alexander Shiyan9d2638132013-06-10 09:59:30 -070060 struct mc13xxx_led *led = container_of(work, struct mc13xxx_led, work);
Alexander Shiyana59ce652014-01-31 22:36:28 -080061 struct mc13xxx_leds *leds = led->leds;
Alexander Shiyan677d13f2014-01-31 22:36:30 -080062 unsigned int reg, bank, off, shift;
Philippe Rétornaz7fdcef82010-05-19 09:24:31 +020063
64 switch (led->id) {
65 case MC13783_LED_MD:
Philippe Rétornaz7fdcef82010-05-19 09:24:31 +020066 case MC13783_LED_AD:
Philippe Rétornaz7fdcef82010-05-19 09:24:31 +020067 case MC13783_LED_KP:
Alexander Shiyana59ce652014-01-31 22:36:28 -080068 reg = 2;
69 shift = 9 + (led->id - MC13783_LED_MD) * 4;
Philippe Rétornaz7fdcef82010-05-19 09:24:31 +020070 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;
Alexander Shiyan9d2638132013-06-10 09:59:30 -070081 bank = off / 3;
Alexander Shiyana59ce652014-01-31 22:36:28 -080082 reg = 3 + bank;
Alexander Shiyan9d2638132013-06-10 09:59:30 -070083 shift = (off - bank * 3) * 5 + 6;
Philippe Rétornaz7fdcef82010-05-19 09:24:31 +020084 break;
Alexander Shiyanae6cdb02013-06-10 09:59:31 -070085 case MC13892_LED_MD:
Alexander Shiyanae6cdb02013-06-10 09:59:31 -070086 case MC13892_LED_AD:
Alexander Shiyanae6cdb02013-06-10 09:59:31 -070087 case MC13892_LED_KP:
Alexander Shiyana59ce652014-01-31 22:36:28 -080088 reg = (led->id - MC13892_LED_MD) / 2;
89 shift = 3 + (led->id - MC13892_LED_MD) * 12;
Alexander Shiyanae6cdb02013-06-10 09:59:31 -070090 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;
Alexander Shiyana59ce652014-01-31 22:36:28 -080096 reg = 2 + bank;
Alexander Shiyanae6cdb02013-06-10 09:59:31 -070097 shift = (off - bank * 2) * 12 + 3;
Alexander Shiyanae6cdb02013-06-10 09:59:31 -070098 break;
Alexander Shiyana59ce652014-01-31 22:36:28 -080099 case MC34708_LED_R:
100 case MC34708_LED_G:
101 reg = 0;
102 shift = 3 + (led->id - MC34708_LED_R) * 12;
Alexander Shiyana59ce652014-01-31 22:36:28 -0800103 break;
Alexander Shiyan9d2638132013-06-10 09:59:30 -0700104 default:
105 BUG();
Philippe Rétornaz7fdcef82010-05-19 09:24:31 +0200106 }
107
Alexander Shiyana59ce652014-01-31 22:36:28 -0800108 mc13xxx_reg_rmw(leds->master, leds->devtype->ledctrl_base + reg,
Alexander Shiyan677d13f2014-01-31 22:36:30 -0800109 mc13xxx_max_brightness(led->id) << shift,
110 led->new_brightness << shift);
Philippe Rétornaz7fdcef82010-05-19 09:24:31 +0200111}
112
Alexander Shiyan9d2638132013-06-10 09:59:30 -0700113static void mc13xxx_led_set(struct led_classdev *led_cdev,
114 enum led_brightness value)
Philippe Rétornaz7fdcef82010-05-19 09:24:31 +0200115{
Alexander Shiyan9d2638132013-06-10 09:59:30 -0700116 struct mc13xxx_led *led =
117 container_of(led_cdev, struct mc13xxx_led, cdev);
Philippe Rétornaz7fdcef82010-05-19 09:24:31 +0200118
Philippe Rétornaz7fdcef82010-05-19 09:24:31 +0200119 led->new_brightness = value;
120 schedule_work(&led->work);
121}
122
Alexander Shiyan25c65792014-01-31 22:37:23 -0800123#ifdef CONFIG_OF
124static 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
178out_node_put:
179 of_node_put(parent);
180
181 return ret ? ERR_PTR(ret) : pdata;
182}
183#else
184static 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
Alexander Shiyan9d2638132013-06-10 09:59:30 -0700191static int __init mc13xxx_led_probe(struct platform_device *pdev)
Philippe Rétornaz7fdcef82010-05-19 09:24:31 +0200192{
Alexander Shiyana59ce652014-01-31 22:36:28 -0800193 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);
Alexander Shiyan9d2638132013-06-10 09:59:30 -0700196 struct mc13xxx_led_devtype *devtype =
197 (struct mc13xxx_led_devtype *)pdev->id_entry->driver_data;
198 struct mc13xxx_leds *leds;
Alexander Shiyan25c65792014-01-31 22:37:23 -0800199 int i, id, ret = -ENODATA;
Alexander Shiyana59ce652014-01-31 22:36:28 -0800200 u32 init_led = 0;
Philippe Rétornaz7fdcef82010-05-19 09:24:31 +0200201
Alexander Shiyan25c65792014-01-31 22:37:23 -0800202 leds = devm_kzalloc(dev, sizeof(*leds), GFP_KERNEL);
Alexander Shiyan9d2638132013-06-10 09:59:30 -0700203 if (!leds)
Philippe Rétornaz7fdcef82010-05-19 09:24:31 +0200204 return -ENOMEM;
Philippe Rétornaz7fdcef82010-05-19 09:24:31 +0200205
Alexander Shiyan9d2638132013-06-10 09:59:30 -0700206 leds->devtype = devtype;
Alexander Shiyana59ce652014-01-31 22:36:28 -0800207 leds->master = mcdev;
Alexander Shiyan9d2638132013-06-10 09:59:30 -0700208 platform_set_drvdata(pdev, leds);
209
Alexander Shiyan25c65792014-01-31 22:37:23 -0800210 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
Alexander Shiyan9d2638132013-06-10 09:59:30 -0700230 for (i = 0; i < devtype->num_regs; i++) {
Alexander Shiyana59ce652014-01-31 22:36:28 -0800231 ret = mc13xxx_reg_write(mcdev, leds->devtype->ledctrl_base + i,
232 pdata->led_control[i]);
Alexander Shiyan9d2638132013-06-10 09:59:30 -0700233 if (ret)
Alexander Shiyan3df22c02013-12-06 22:22:19 -0800234 return ret;
Philippe Rétornaz7fdcef82010-05-19 09:24:31 +0200235 }
236
Alexander Shiyan25c65792014-01-31 22:37:23 -0800237 for (i = 0; i < leds->num_leds; i++) {
Alexander Shiyan9d2638132013-06-10 09:59:30 -0700238 const char *name, *trig;
Philippe Rétornaz7fdcef82010-05-19 09:24:31 +0200239
Alexander Shiyan9d2638132013-06-10 09:59:30 -0700240 ret = -EINVAL;
241
242 id = pdata->led[i].id;
243 name = pdata->led[i].name;
244 trig = pdata->led[i].default_trigger;
Alexander Shiyan9d2638132013-06-10 09:59:30 -0700245
246 if ((id > devtype->led_max) || (id < devtype->led_min)) {
Alexander Shiyana59ce652014-01-31 22:36:28 -0800247 dev_err(dev, "Invalid ID %i\n", id);
Alexander Shiyan9d2638132013-06-10 09:59:30 -0700248 break;
Philippe Rétornaz7fdcef82010-05-19 09:24:31 +0200249 }
250
Alexander Shiyan9d2638132013-06-10 09:59:30 -0700251 if (init_led & (1 << id)) {
Alexander Shiyana59ce652014-01-31 22:36:28 -0800252 dev_warn(dev, "LED %i already initialized\n", id);
Alexander Shiyan9d2638132013-06-10 09:59:30 -0700253 break;
Philippe Rétornaz7fdcef82010-05-19 09:24:31 +0200254 }
255
Alexander Shiyan9d2638132013-06-10 09:59:30 -0700256 init_led |= 1 << id;
257 leds->led[i].id = id;
Alexander Shiyana59ce652014-01-31 22:36:28 -0800258 leds->led[i].leds = leds;
Alexander Shiyan9d2638132013-06-10 09:59:30 -0700259 leds->led[i].cdev.name = name;
260 leds->led[i].cdev.default_trigger = trig;
Alexander Shiyan02e9e112014-01-31 22:36:29 -0800261 leds->led[i].cdev.flags = LED_CORE_SUSPENDRESUME;
Alexander Shiyan9d2638132013-06-10 09:59:30 -0700262 leds->led[i].cdev.brightness_set = mc13xxx_led_set;
Alexander Shiyan677d13f2014-01-31 22:36:30 -0800263 leds->led[i].cdev.max_brightness = mc13xxx_max_brightness(id);
Philippe Rétornaz7fdcef82010-05-19 09:24:31 +0200264
Alexander Shiyan9d2638132013-06-10 09:59:30 -0700265 INIT_WORK(&leds->led[i].work, mc13xxx_led_work);
Philippe Rétornaz7fdcef82010-05-19 09:24:31 +0200266
Alexander Shiyana59ce652014-01-31 22:36:28 -0800267 ret = led_classdev_register(dev->parent, &leds->led[i].cdev);
Philippe Rétornaz7fdcef82010-05-19 09:24:31 +0200268 if (ret) {
Alexander Shiyana59ce652014-01-31 22:36:28 -0800269 dev_err(dev, "Failed to register LED %i\n", id);
Alexander Shiyan9d2638132013-06-10 09:59:30 -0700270 break;
Philippe Rétornaz7fdcef82010-05-19 09:24:31 +0200271 }
272 }
273
Alexander Shiyan9d2638132013-06-10 09:59:30 -0700274 if (ret)
275 while (--i >= 0) {
276 led_classdev_unregister(&leds->led[i].cdev);
277 cancel_work_sync(&leds->led[i].work);
278 }
Philippe Rétornaz7fdcef82010-05-19 09:24:31 +0200279
Philippe Rétornaz7fdcef82010-05-19 09:24:31 +0200280 return ret;
281}
282
Alexander Shiyan9d2638132013-06-10 09:59:30 -0700283static int mc13xxx_led_remove(struct platform_device *pdev)
Philippe Rétornaz7fdcef82010-05-19 09:24:31 +0200284{
Alexander Shiyan9d2638132013-06-10 09:59:30 -0700285 struct mc13xxx_leds *leds = platform_get_drvdata(pdev);
Philippe Rétornaz7fdcef82010-05-19 09:24:31 +0200286 int i;
287
Alexander Shiyan9d2638132013-06-10 09:59:30 -0700288 for (i = 0; i < leds->num_leds; i++) {
289 led_classdev_unregister(&leds->led[i].cdev);
290 cancel_work_sync(&leds->led[i].work);
Philippe Rétornaz7fdcef82010-05-19 09:24:31 +0200291 }
292
Philippe Rétornaz7fdcef82010-05-19 09:24:31 +0200293 return 0;
294}
295
Alexander Shiyan9d2638132013-06-10 09:59:30 -0700296static const struct mc13xxx_led_devtype mc13783_led_devtype = {
297 .led_min = MC13783_LED_MD,
298 .led_max = MC13783_LED_B3,
299 .num_regs = 6,
Alexander Shiyana59ce652014-01-31 22:36:28 -0800300 .ledctrl_base = 51,
Philippe Rétornaz7fdcef82010-05-19 09:24:31 +0200301};
302
Alexander Shiyanae6cdb02013-06-10 09:59:31 -0700303static const struct mc13xxx_led_devtype mc13892_led_devtype = {
304 .led_min = MC13892_LED_MD,
305 .led_max = MC13892_LED_B,
306 .num_regs = 4,
Alexander Shiyana59ce652014-01-31 22:36:28 -0800307 .ledctrl_base = 51,
308};
309
310static 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,
Alexander Shiyanae6cdb02013-06-10 09:59:31 -0700315};
316
Alexander Shiyan9d2638132013-06-10 09:59:30 -0700317static const struct platform_device_id mc13xxx_led_id_table[] = {
318 { "mc13783-led", (kernel_ulong_t)&mc13783_led_devtype, },
Alexander Shiyanae6cdb02013-06-10 09:59:31 -0700319 { "mc13892-led", (kernel_ulong_t)&mc13892_led_devtype, },
Alexander Shiyana59ce652014-01-31 22:36:28 -0800320 { "mc34708-led", (kernel_ulong_t)&mc34708_led_devtype, },
Alexander Shiyan9d2638132013-06-10 09:59:30 -0700321 { }
322};
323MODULE_DEVICE_TABLE(platform, mc13xxx_led_id_table);
Philippe Rétornaz7fdcef82010-05-19 09:24:31 +0200324
Alexander Shiyan9d2638132013-06-10 09:59:30 -0700325static 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};
333module_platform_driver_probe(mc13xxx_led_driver, mc13xxx_led_probe);
334
335MODULE_DESCRIPTION("LEDs driver for Freescale MC13XXX PMIC");
Philippe Rétornaz7fdcef82010-05-19 09:24:31 +0200336MODULE_AUTHOR("Philippe Retornaz <philippe.retornaz@epfl.ch>");
337MODULE_LICENSE("GPL");