2 * LEDs driver for Freescale MC13783/MC13892/MC34708
4 * Copyright (C) 2010 Philippe Rétornaz
6 * Based on leds-da903x:
7 * Copyright (C) 2008 Compulab, Ltd.
8 * Mike Rapoport <mike@compulab.co.il>
10 * Copyright (C) 2006-2008 Marvell International Ltd.
11 * Eric Miao <eric.miao@marvell.com>
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.
18 #include <linux/module.h>
19 #include <linux/kernel.h>
20 #include <linux/init.h>
21 #include <linux/platform_device.h>
22 #include <linux/leds.h>
23 #include <linux/workqueue.h>
24 #include <linux/mfd/mc13xxx.h>
26 struct mc13xxx_led_devtype {
34 struct led_classdev cdev;
35 struct work_struct work;
36 enum led_brightness new_brightness;
38 struct mc13xxx_leds *leds;
42 struct mc13xxx *master;
43 struct mc13xxx_led_devtype *devtype;
45 struct mc13xxx_led led[0];
48 static unsigned int mc13xxx_max_brightness(int id)
50 if (id >= MC13783_LED_MD && id <= MC13783_LED_KP)
52 else if (id >= MC13783_LED_R1 && id <= MC13783_LED_B3)
58 static void mc13xxx_led_work(struct work_struct *work)
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;
69 shift = 9 + (led->id - MC13783_LED_MD) * 4;
80 off = led->id - MC13783_LED_R1;
83 shift = (off - bank * 3) * 5 + 6;
88 reg = (led->id - MC13892_LED_MD) / 2;
89 shift = 3 + (led->id - MC13892_LED_MD) * 12;
94 off = led->id - MC13892_LED_R;
97 shift = (off - bank * 2) * 12 + 3;
102 shift = 3 + (led->id - MC34708_LED_R) * 12;
108 mc13xxx_reg_rmw(leds->master, leds->devtype->ledctrl_base + reg,
109 mc13xxx_max_brightness(led->id) << shift,
110 led->new_brightness << shift);
113 static void mc13xxx_led_set(struct led_classdev *led_cdev,
114 enum led_brightness value)
116 struct mc13xxx_led *led =
117 container_of(led_cdev, struct mc13xxx_led, cdev);
119 led->new_brightness = value;
120 schedule_work(&led->work);
123 static int __init mc13xxx_led_probe(struct platform_device *pdev)
125 struct device *dev = &pdev->dev;
126 struct mc13xxx_leds_platform_data *pdata = dev_get_platdata(dev);
127 struct mc13xxx *mcdev = dev_get_drvdata(dev->parent);
128 struct mc13xxx_led_devtype *devtype =
129 (struct mc13xxx_led_devtype *)pdev->id_entry->driver_data;
130 struct mc13xxx_leds *leds;
131 int i, id, num_leds, ret = -ENODATA;
135 dev_err(dev, "Missing platform data\n");
139 num_leds = pdata->num_leds;
141 if ((num_leds < 1) ||
142 (num_leds > (devtype->led_max - devtype->led_min + 1))) {
143 dev_err(dev, "Invalid LED count %d\n", num_leds);
147 leds = devm_kzalloc(dev, num_leds * sizeof(struct mc13xxx_led) +
148 sizeof(struct mc13xxx_leds), GFP_KERNEL);
152 leds->devtype = devtype;
153 leds->num_leds = num_leds;
154 leds->master = mcdev;
155 platform_set_drvdata(pdev, leds);
157 for (i = 0; i < devtype->num_regs; i++) {
158 ret = mc13xxx_reg_write(mcdev, leds->devtype->ledctrl_base + i,
159 pdata->led_control[i]);
164 for (i = 0; i < num_leds; i++) {
165 const char *name, *trig;
169 id = pdata->led[i].id;
170 name = pdata->led[i].name;
171 trig = pdata->led[i].default_trigger;
173 if ((id > devtype->led_max) || (id < devtype->led_min)) {
174 dev_err(dev, "Invalid ID %i\n", id);
178 if (init_led & (1 << id)) {
179 dev_warn(dev, "LED %i already initialized\n", id);
184 leds->led[i].id = id;
185 leds->led[i].leds = leds;
186 leds->led[i].cdev.name = name;
187 leds->led[i].cdev.default_trigger = trig;
188 leds->led[i].cdev.flags = LED_CORE_SUSPENDRESUME;
189 leds->led[i].cdev.brightness_set = mc13xxx_led_set;
190 leds->led[i].cdev.max_brightness = mc13xxx_max_brightness(id);
192 INIT_WORK(&leds->led[i].work, mc13xxx_led_work);
194 ret = led_classdev_register(dev->parent, &leds->led[i].cdev);
196 dev_err(dev, "Failed to register LED %i\n", id);
203 led_classdev_unregister(&leds->led[i].cdev);
204 cancel_work_sync(&leds->led[i].work);
210 static int mc13xxx_led_remove(struct platform_device *pdev)
212 struct mc13xxx_leds *leds = platform_get_drvdata(pdev);
215 for (i = 0; i < leds->num_leds; i++) {
216 led_classdev_unregister(&leds->led[i].cdev);
217 cancel_work_sync(&leds->led[i].work);
223 static const struct mc13xxx_led_devtype mc13783_led_devtype = {
224 .led_min = MC13783_LED_MD,
225 .led_max = MC13783_LED_B3,
230 static const struct mc13xxx_led_devtype mc13892_led_devtype = {
231 .led_min = MC13892_LED_MD,
232 .led_max = MC13892_LED_B,
237 static const struct mc13xxx_led_devtype mc34708_led_devtype = {
238 .led_min = MC34708_LED_R,
239 .led_max = MC34708_LED_G,
244 static const struct platform_device_id mc13xxx_led_id_table[] = {
245 { "mc13783-led", (kernel_ulong_t)&mc13783_led_devtype, },
246 { "mc13892-led", (kernel_ulong_t)&mc13892_led_devtype, },
247 { "mc34708-led", (kernel_ulong_t)&mc34708_led_devtype, },
250 MODULE_DEVICE_TABLE(platform, mc13xxx_led_id_table);
252 static struct platform_driver mc13xxx_led_driver = {
254 .name = "mc13xxx-led",
255 .owner = THIS_MODULE,
257 .remove = mc13xxx_led_remove,
258 .id_table = mc13xxx_led_id_table,
260 module_platform_driver_probe(mc13xxx_led_driver, mc13xxx_led_probe);
262 MODULE_DESCRIPTION("LEDs driver for Freescale MC13XXX PMIC");
263 MODULE_AUTHOR("Philippe Retornaz <philippe.retornaz@epfl.ch>");
264 MODULE_LICENSE("GPL");