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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>
David Janderf3ca0782011-08-24 15:28:20 +020023#include <linux/mfd/mc13xxx.h>
Philippe Rétornaz7fdcef82010-05-19 09:24:31 +020024
Alexander Shiyan9d2638132013-06-10 09:59:30 -070025struct mc13xxx_led_devtype {
26 int led_min;
27 int led_max;
28 int num_regs;
Alexander Shiyana59ce652014-01-31 22:36:28 -080029 u32 ledctrl_base;
Alexander Shiyan9d2638132013-06-10 09:59:30 -070030};
31
32struct mc13xxx_led {
Philippe Rétornaz7fdcef82010-05-19 09:24:31 +020033 struct led_classdev cdev;
Philippe Rétornaz7fdcef82010-05-19 09:24:31 +020034 int id;
Alexander Shiyana59ce652014-01-31 22:36:28 -080035 struct mc13xxx_leds *leds;
Philippe Rétornaz7fdcef82010-05-19 09:24:31 +020036};
37
Alexander Shiyan9d2638132013-06-10 09:59:30 -070038struct mc13xxx_leds {
Alexander Shiyana59ce652014-01-31 22:36:28 -080039 struct mc13xxx *master;
Alexander Shiyan9d2638132013-06-10 09:59:30 -070040 struct mc13xxx_led_devtype *devtype;
41 int num_leds;
Alexander Shiyan25c65792014-01-31 22:37:23 -080042 struct mc13xxx_led *led;
Alexander Shiyan9d2638132013-06-10 09:59:30 -070043};
Philippe Rétornaz7fdcef82010-05-19 09:24:31 +020044
Alexander Shiyan677d13f2014-01-31 22:36:30 -080045static 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
Andrew Lunn4330f2f2015-08-20 12:52:08 +020055static int mc13xxx_led_set(struct led_classdev *led_cdev,
56 enum led_brightness value)
Philippe Rétornaz7fdcef82010-05-19 09:24:31 +020057{
Andrew Lunn4330f2f2015-08-20 12:52:08 +020058 struct mc13xxx_led *led =
59 container_of(led_cdev, struct mc13xxx_led, cdev);
Alexander Shiyana59ce652014-01-31 22:36:28 -080060 struct mc13xxx_leds *leds = led->leds;
Alexander Shiyan677d13f2014-01-31 22:36:30 -080061 unsigned int reg, bank, off, shift;
Philippe Rétornaz7fdcef82010-05-19 09:24:31 +020062
63 switch (led->id) {
64 case MC13783_LED_MD:
Philippe Rétornaz7fdcef82010-05-19 09:24:31 +020065 case MC13783_LED_AD:
Philippe Rétornaz7fdcef82010-05-19 09:24:31 +020066 case MC13783_LED_KP:
Alexander Shiyana59ce652014-01-31 22:36:28 -080067 reg = 2;
68 shift = 9 + (led->id - MC13783_LED_MD) * 4;
Philippe Rétornaz7fdcef82010-05-19 09:24:31 +020069 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;
Alexander Shiyan9d2638132013-06-10 09:59:30 -070080 bank = off / 3;
Alexander Shiyana59ce652014-01-31 22:36:28 -080081 reg = 3 + bank;
Alexander Shiyan9d2638132013-06-10 09:59:30 -070082 shift = (off - bank * 3) * 5 + 6;
Philippe Rétornaz7fdcef82010-05-19 09:24:31 +020083 break;
Alexander Shiyanae6cdb02013-06-10 09:59:31 -070084 case MC13892_LED_MD:
Alexander Shiyanae6cdb02013-06-10 09:59:31 -070085 case MC13892_LED_AD:
Alexander Shiyanae6cdb02013-06-10 09:59:31 -070086 case MC13892_LED_KP:
Alexander Shiyana59ce652014-01-31 22:36:28 -080087 reg = (led->id - MC13892_LED_MD) / 2;
88 shift = 3 + (led->id - MC13892_LED_MD) * 12;
Alexander Shiyanae6cdb02013-06-10 09:59:31 -070089 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;
Alexander Shiyana59ce652014-01-31 22:36:28 -080095 reg = 2 + bank;
Alexander Shiyanae6cdb02013-06-10 09:59:31 -070096 shift = (off - bank * 2) * 12 + 3;
Alexander Shiyanae6cdb02013-06-10 09:59:31 -070097 break;
Alexander Shiyana59ce652014-01-31 22:36:28 -080098 case MC34708_LED_R:
99 case MC34708_LED_G:
100 reg = 0;
101 shift = 3 + (led->id - MC34708_LED_R) * 12;
Alexander Shiyana59ce652014-01-31 22:36:28 -0800102 break;
Alexander Shiyan9d2638132013-06-10 09:59:30 -0700103 default:
104 BUG();
Philippe Rétornaz7fdcef82010-05-19 09:24:31 +0200105 }
106
Andrew Lunn4330f2f2015-08-20 12:52:08 +0200107 return mc13xxx_reg_rmw(leds->master, leds->devtype->ledctrl_base + reg,
Alexander Shiyan677d13f2014-01-31 22:36:30 -0800108 mc13xxx_max_brightness(led->id) << shift,
Andrew Lunn4330f2f2015-08-20 12:52:08 +0200109 value << shift);
Philippe Rétornaz7fdcef82010-05-19 09:24:31 +0200110}
111
Alexander Shiyan25c65792014-01-31 22:37:23 -0800112#ifdef CONFIG_OF
113static 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
Geert Uytterhoeven452bc142015-01-14 05:51:58 -0800126 parent = of_get_child_by_name(dev->parent->of_node, "leds");
Alexander Shiyan25c65792014-01-31 22:37:23 -0800127 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
165out_node_put:
166 of_node_put(parent);
167
168 return ret ? ERR_PTR(ret) : pdata;
169}
170#else
171static 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
Alexander Shiyan9d2638132013-06-10 09:59:30 -0700178static int __init mc13xxx_led_probe(struct platform_device *pdev)
Philippe Rétornaz7fdcef82010-05-19 09:24:31 +0200179{
Alexander Shiyana59ce652014-01-31 22:36:28 -0800180 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);
Alexander Shiyan9d2638132013-06-10 09:59:30 -0700183 struct mc13xxx_led_devtype *devtype =
184 (struct mc13xxx_led_devtype *)pdev->id_entry->driver_data;
185 struct mc13xxx_leds *leds;
Alexander Shiyan25c65792014-01-31 22:37:23 -0800186 int i, id, ret = -ENODATA;
Alexander Shiyana59ce652014-01-31 22:36:28 -0800187 u32 init_led = 0;
Philippe Rétornaz7fdcef82010-05-19 09:24:31 +0200188
Alexander Shiyan25c65792014-01-31 22:37:23 -0800189 leds = devm_kzalloc(dev, sizeof(*leds), GFP_KERNEL);
Alexander Shiyan9d2638132013-06-10 09:59:30 -0700190 if (!leds)
Philippe Rétornaz7fdcef82010-05-19 09:24:31 +0200191 return -ENOMEM;
Philippe Rétornaz7fdcef82010-05-19 09:24:31 +0200192
Alexander Shiyan9d2638132013-06-10 09:59:30 -0700193 leds->devtype = devtype;
Alexander Shiyana59ce652014-01-31 22:36:28 -0800194 leds->master = mcdev;
Alexander Shiyan9d2638132013-06-10 09:59:30 -0700195 platform_set_drvdata(pdev, leds);
196
Alexander Shiyan25c65792014-01-31 22:37:23 -0800197 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
Alexander Shiyan9d2638132013-06-10 09:59:30 -0700217 for (i = 0; i < devtype->num_regs; i++) {
Alexander Shiyana59ce652014-01-31 22:36:28 -0800218 ret = mc13xxx_reg_write(mcdev, leds->devtype->ledctrl_base + i,
219 pdata->led_control[i]);
Alexander Shiyan9d2638132013-06-10 09:59:30 -0700220 if (ret)
Alexander Shiyan3df22c02013-12-06 22:22:19 -0800221 return ret;
Philippe Rétornaz7fdcef82010-05-19 09:24:31 +0200222 }
223
Alexander Shiyan25c65792014-01-31 22:37:23 -0800224 for (i = 0; i < leds->num_leds; i++) {
Alexander Shiyan9d2638132013-06-10 09:59:30 -0700225 const char *name, *trig;
Philippe Rétornaz7fdcef82010-05-19 09:24:31 +0200226
Alexander Shiyan9d2638132013-06-10 09:59:30 -0700227 ret = -EINVAL;
228
229 id = pdata->led[i].id;
230 name = pdata->led[i].name;
231 trig = pdata->led[i].default_trigger;
Alexander Shiyan9d2638132013-06-10 09:59:30 -0700232
233 if ((id > devtype->led_max) || (id < devtype->led_min)) {
Alexander Shiyana59ce652014-01-31 22:36:28 -0800234 dev_err(dev, "Invalid ID %i\n", id);
Alexander Shiyan9d2638132013-06-10 09:59:30 -0700235 break;
Philippe Rétornaz7fdcef82010-05-19 09:24:31 +0200236 }
237
Alexander Shiyan9d2638132013-06-10 09:59:30 -0700238 if (init_led & (1 << id)) {
Alexander Shiyana59ce652014-01-31 22:36:28 -0800239 dev_warn(dev, "LED %i already initialized\n", id);
Alexander Shiyan9d2638132013-06-10 09:59:30 -0700240 break;
Philippe Rétornaz7fdcef82010-05-19 09:24:31 +0200241 }
242
Alexander Shiyan9d2638132013-06-10 09:59:30 -0700243 init_led |= 1 << id;
244 leds->led[i].id = id;
Alexander Shiyana59ce652014-01-31 22:36:28 -0800245 leds->led[i].leds = leds;
Alexander Shiyan9d2638132013-06-10 09:59:30 -0700246 leds->led[i].cdev.name = name;
247 leds->led[i].cdev.default_trigger = trig;
Alexander Shiyan02e9e112014-01-31 22:36:29 -0800248 leds->led[i].cdev.flags = LED_CORE_SUSPENDRESUME;
Andrew Lunn4330f2f2015-08-20 12:52:08 +0200249 leds->led[i].cdev.brightness_set_blocking = mc13xxx_led_set;
Alexander Shiyan677d13f2014-01-31 22:36:30 -0800250 leds->led[i].cdev.max_brightness = mc13xxx_max_brightness(id);
Philippe Rétornaz7fdcef82010-05-19 09:24:31 +0200251
Alexander Shiyana59ce652014-01-31 22:36:28 -0800252 ret = led_classdev_register(dev->parent, &leds->led[i].cdev);
Philippe Rétornaz7fdcef82010-05-19 09:24:31 +0200253 if (ret) {
Alexander Shiyana59ce652014-01-31 22:36:28 -0800254 dev_err(dev, "Failed to register LED %i\n", id);
Alexander Shiyan9d2638132013-06-10 09:59:30 -0700255 break;
Philippe Rétornaz7fdcef82010-05-19 09:24:31 +0200256 }
257 }
258
Alexander Shiyan9d2638132013-06-10 09:59:30 -0700259 if (ret)
Andrew Lunn4330f2f2015-08-20 12:52:08 +0200260 while (--i >= 0)
Alexander Shiyan9d2638132013-06-10 09:59:30 -0700261 led_classdev_unregister(&leds->led[i].cdev);
Philippe Rétornaz7fdcef82010-05-19 09:24:31 +0200262
Philippe Rétornaz7fdcef82010-05-19 09:24:31 +0200263 return ret;
264}
265
Alexander Shiyan9d2638132013-06-10 09:59:30 -0700266static int mc13xxx_led_remove(struct platform_device *pdev)
Philippe Rétornaz7fdcef82010-05-19 09:24:31 +0200267{
Alexander Shiyan9d2638132013-06-10 09:59:30 -0700268 struct mc13xxx_leds *leds = platform_get_drvdata(pdev);
Philippe Rétornaz7fdcef82010-05-19 09:24:31 +0200269 int i;
270
Andrew Lunn4330f2f2015-08-20 12:52:08 +0200271 for (i = 0; i < leds->num_leds; i++)
Alexander Shiyan9d2638132013-06-10 09:59:30 -0700272 led_classdev_unregister(&leds->led[i].cdev);
Philippe Rétornaz7fdcef82010-05-19 09:24:31 +0200273
Philippe Rétornaz7fdcef82010-05-19 09:24:31 +0200274 return 0;
275}
276
Alexander Shiyan9d2638132013-06-10 09:59:30 -0700277static const struct mc13xxx_led_devtype mc13783_led_devtype = {
278 .led_min = MC13783_LED_MD,
279 .led_max = MC13783_LED_B3,
280 .num_regs = 6,
Alexander Shiyana59ce652014-01-31 22:36:28 -0800281 .ledctrl_base = 51,
Philippe Rétornaz7fdcef82010-05-19 09:24:31 +0200282};
283
Alexander Shiyanae6cdb02013-06-10 09:59:31 -0700284static const struct mc13xxx_led_devtype mc13892_led_devtype = {
285 .led_min = MC13892_LED_MD,
286 .led_max = MC13892_LED_B,
287 .num_regs = 4,
Alexander Shiyana59ce652014-01-31 22:36:28 -0800288 .ledctrl_base = 51,
289};
290
291static 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,
Alexander Shiyanae6cdb02013-06-10 09:59:31 -0700296};
297
Alexander Shiyan9d2638132013-06-10 09:59:30 -0700298static const struct platform_device_id mc13xxx_led_id_table[] = {
299 { "mc13783-led", (kernel_ulong_t)&mc13783_led_devtype, },
Alexander Shiyanae6cdb02013-06-10 09:59:31 -0700300 { "mc13892-led", (kernel_ulong_t)&mc13892_led_devtype, },
Alexander Shiyana59ce652014-01-31 22:36:28 -0800301 { "mc34708-led", (kernel_ulong_t)&mc34708_led_devtype, },
Alexander Shiyan9d2638132013-06-10 09:59:30 -0700302 { }
303};
304MODULE_DEVICE_TABLE(platform, mc13xxx_led_id_table);
Philippe Rétornaz7fdcef82010-05-19 09:24:31 +0200305
Alexander Shiyan9d2638132013-06-10 09:59:30 -0700306static struct platform_driver mc13xxx_led_driver = {
307 .driver = {
308 .name = "mc13xxx-led",
Alexander Shiyan9d2638132013-06-10 09:59:30 -0700309 },
310 .remove = mc13xxx_led_remove,
311 .id_table = mc13xxx_led_id_table,
312};
313module_platform_driver_probe(mc13xxx_led_driver, mc13xxx_led_probe);
314
315MODULE_DESCRIPTION("LEDs driver for Freescale MC13XXX PMIC");
Philippe Rétornaz7fdcef82010-05-19 09:24:31 +0200316MODULE_AUTHOR("Philippe Retornaz <philippe.retornaz@epfl.ch>");
317MODULE_LICENSE("GPL");