2 * LEDs driver for Freescale MC13783/MC13892
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 #define MC13XXX_REG_LED_CONTROL(x) (51 + (x))
28 struct mc13xxx_led_devtype {
35 struct led_classdev cdev;
36 struct work_struct work;
37 struct mc13xxx *master;
38 enum led_brightness new_brightness;
43 struct mc13xxx_led_devtype *devtype;
45 struct mc13xxx_led led[0];
48 static void mc13xxx_led_work(struct work_struct *work)
50 struct mc13xxx_led *led = container_of(work, struct mc13xxx_led, work);
51 int reg, mask, value, bank, off, shift;
55 reg = MC13XXX_REG_LED_CONTROL(2);
58 value = led->new_brightness >> 4;
61 reg = MC13XXX_REG_LED_CONTROL(2);
64 value = led->new_brightness >> 4;
67 reg = MC13XXX_REG_LED_CONTROL(2);
70 value = led->new_brightness >> 4;
81 off = led->id - MC13783_LED_R1;
83 reg = MC13XXX_REG_LED_CONTROL(3) + bank;
84 shift = (off - bank * 3) * 5 + 6;
85 value = led->new_brightness >> 3;
89 reg = MC13XXX_REG_LED_CONTROL(0);
92 value = led->new_brightness >> 2;
95 reg = MC13XXX_REG_LED_CONTROL(0);
98 value = led->new_brightness >> 2;
101 reg = MC13XXX_REG_LED_CONTROL(1);
104 value = led->new_brightness >> 2;
109 off = led->id - MC13892_LED_R;
111 reg = MC13XXX_REG_LED_CONTROL(2) + bank;
112 shift = (off - bank * 2) * 12 + 3;
113 value = led->new_brightness >> 2;
120 mc13xxx_lock(led->master);
121 mc13xxx_reg_rmw(led->master, reg, mask << shift, value << shift);
122 mc13xxx_unlock(led->master);
125 static void mc13xxx_led_set(struct led_classdev *led_cdev,
126 enum led_brightness value)
128 struct mc13xxx_led *led =
129 container_of(led_cdev, struct mc13xxx_led, cdev);
131 led->new_brightness = value;
132 schedule_work(&led->work);
135 static int __init mc13xxx_led_setup(struct mc13xxx_led *led, int max_current)
137 int shift, mask, reg, ret, bank;
141 reg = MC13XXX_REG_LED_CONTROL(2);
146 reg = MC13XXX_REG_LED_CONTROL(2);
151 reg = MC13XXX_REG_LED_CONTROL(2);
164 bank = (led->id - MC13783_LED_R1) / 3;
165 reg = MC13XXX_REG_LED_CONTROL(3) + bank;
166 shift = ((led->id - MC13783_LED_R1) - bank * 3) * 2;
170 reg = MC13XXX_REG_LED_CONTROL(0);
175 reg = MC13XXX_REG_LED_CONTROL(0);
180 reg = MC13XXX_REG_LED_CONTROL(1);
187 bank = (led->id - MC13892_LED_R) / 2;
188 reg = MC13XXX_REG_LED_CONTROL(2) + bank;
189 shift = ((led->id - MC13892_LED_R) - bank * 2) * 12 + 9;
196 mc13xxx_lock(led->master);
197 ret = mc13xxx_reg_rmw(led->master, reg, mask << shift,
198 max_current << shift);
199 mc13xxx_unlock(led->master);
204 static int __init mc13xxx_led_probe(struct platform_device *pdev)
206 struct mc13xxx_leds_platform_data *pdata = dev_get_platdata(&pdev->dev);
207 struct mc13xxx *mcdev = dev_get_drvdata(pdev->dev.parent);
208 struct mc13xxx_led_devtype *devtype =
209 (struct mc13xxx_led_devtype *)pdev->id_entry->driver_data;
210 struct mc13xxx_leds *leds;
211 int i, id, num_leds, ret = -ENODATA;
212 u32 reg, init_led = 0;
215 dev_err(&pdev->dev, "Missing platform data\n");
219 num_leds = pdata->num_leds;
221 if ((num_leds < 1) ||
222 (num_leds > (devtype->led_max - devtype->led_min + 1))) {
223 dev_err(&pdev->dev, "Invalid LED count %d\n", num_leds);
227 leds = devm_kzalloc(&pdev->dev, num_leds * sizeof(struct mc13xxx_led) +
228 sizeof(struct mc13xxx_leds), GFP_KERNEL);
232 leds->devtype = devtype;
233 leds->num_leds = num_leds;
234 platform_set_drvdata(pdev, leds);
237 for (i = 0; i < devtype->num_regs; i++) {
238 reg = pdata->led_control[i];
239 WARN_ON(reg >= (1 << 24));
240 ret = mc13xxx_reg_write(mcdev, MC13XXX_REG_LED_CONTROL(i), reg);
244 mc13xxx_unlock(mcdev);
247 dev_err(&pdev->dev, "Unable to init LED driver\n");
251 for (i = 0; i < num_leds; i++) {
252 const char *name, *trig;
257 id = pdata->led[i].id;
258 name = pdata->led[i].name;
259 trig = pdata->led[i].default_trigger;
260 max_current = pdata->led[i].max_current;
262 if ((id > devtype->led_max) || (id < devtype->led_min)) {
263 dev_err(&pdev->dev, "Invalid ID %i\n", id);
267 if (init_led & (1 << id)) {
269 "LED %i already initialized\n", id);
274 leds->led[i].id = id;
275 leds->led[i].master = mcdev;
276 leds->led[i].cdev.name = name;
277 leds->led[i].cdev.default_trigger = trig;
278 leds->led[i].cdev.brightness_set = mc13xxx_led_set;
279 leds->led[i].cdev.brightness = LED_OFF;
281 INIT_WORK(&leds->led[i].work, mc13xxx_led_work);
283 ret = mc13xxx_led_setup(&leds->led[i], max_current);
285 dev_err(&pdev->dev, "Unable to setup LED %i\n", id);
288 ret = led_classdev_register(pdev->dev.parent,
291 dev_err(&pdev->dev, "Failed to register LED %i\n", id);
298 led_classdev_unregister(&leds->led[i].cdev);
299 cancel_work_sync(&leds->led[i].work);
305 static int mc13xxx_led_remove(struct platform_device *pdev)
307 struct mc13xxx *mcdev = dev_get_drvdata(pdev->dev.parent);
308 struct mc13xxx_leds *leds = platform_get_drvdata(pdev);
311 for (i = 0; i < leds->num_leds; i++) {
312 led_classdev_unregister(&leds->led[i].cdev);
313 cancel_work_sync(&leds->led[i].work);
317 for (i = 0; i < leds->devtype->num_regs; i++)
318 mc13xxx_reg_write(mcdev, MC13XXX_REG_LED_CONTROL(i), 0);
319 mc13xxx_unlock(mcdev);
324 static const struct mc13xxx_led_devtype mc13783_led_devtype = {
325 .led_min = MC13783_LED_MD,
326 .led_max = MC13783_LED_B3,
330 static const struct mc13xxx_led_devtype mc13892_led_devtype = {
331 .led_min = MC13892_LED_MD,
332 .led_max = MC13892_LED_B,
336 static const struct platform_device_id mc13xxx_led_id_table[] = {
337 { "mc13783-led", (kernel_ulong_t)&mc13783_led_devtype, },
338 { "mc13892-led", (kernel_ulong_t)&mc13892_led_devtype, },
341 MODULE_DEVICE_TABLE(platform, mc13xxx_led_id_table);
343 static struct platform_driver mc13xxx_led_driver = {
345 .name = "mc13xxx-led",
346 .owner = THIS_MODULE,
348 .remove = mc13xxx_led_remove,
349 .id_table = mc13xxx_led_id_table,
351 module_platform_driver_probe(mc13xxx_led_driver, mc13xxx_led_probe);
353 MODULE_DESCRIPTION("LEDs driver for Freescale MC13XXX PMIC");
354 MODULE_AUTHOR("Philippe Retornaz <philippe.retornaz@epfl.ch>");
355 MODULE_LICENSE("GPL");