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/platform_device.h>
21 #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;
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);
124 static struct mc13xxx_leds_platform_data __init *mc13xxx_led_probe_dt(
125 struct platform_device *pdev)
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;
133 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
135 return ERR_PTR(-ENOMEM);
137 parent = of_get_child_by_name(dev->parent->of_node, "leds");
141 ret = of_property_read_u32_array(parent, "led-control",
143 leds->devtype->num_regs);
147 pdata->num_leds = of_get_child_count(parent);
149 pdata->led = devm_kzalloc(dev, pdata->num_leds * sizeof(*pdata->led),
156 for_each_child_of_node(parent, child) {
160 if (of_property_read_u32(child, "reg", &tmp))
162 pdata->led[i].id = leds->devtype->led_min + tmp;
164 if (!of_property_read_string(child, "label", &str))
165 pdata->led[i].name = str;
166 if (!of_property_read_string(child, "linux,default-trigger",
168 pdata->led[i].default_trigger = str;
174 ret = i > 0 ? 0 : -ENODATA;
179 return ret ? ERR_PTR(ret) : pdata;
182 static inline struct mc13xxx_leds_platform_data __init *mc13xxx_led_probe_dt(
183 struct platform_device *pdev)
185 return ERR_PTR(-ENOSYS);
189 static int __init mc13xxx_led_probe(struct platform_device *pdev)
191 struct device *dev = &pdev->dev;
192 struct mc13xxx_leds_platform_data *pdata = dev_get_platdata(dev);
193 struct mc13xxx *mcdev = dev_get_drvdata(dev->parent);
194 struct mc13xxx_led_devtype *devtype =
195 (struct mc13xxx_led_devtype *)pdev->id_entry->driver_data;
196 struct mc13xxx_leds *leds;
197 int i, id, ret = -ENODATA;
200 leds = devm_kzalloc(dev, sizeof(*leds), GFP_KERNEL);
204 leds->devtype = devtype;
205 leds->master = mcdev;
206 platform_set_drvdata(pdev, leds);
208 if (dev->parent->of_node) {
209 pdata = mc13xxx_led_probe_dt(pdev);
211 return PTR_ERR(pdata);
215 leds->num_leds = pdata->num_leds;
217 if ((leds->num_leds < 1) ||
218 (leds->num_leds > (devtype->led_max - devtype->led_min + 1))) {
219 dev_err(dev, "Invalid LED count %d\n", leds->num_leds);
223 leds->led = devm_kzalloc(dev, leds->num_leds * sizeof(*leds->led),
228 for (i = 0; i < devtype->num_regs; i++) {
229 ret = mc13xxx_reg_write(mcdev, leds->devtype->ledctrl_base + i,
230 pdata->led_control[i]);
235 for (i = 0; i < leds->num_leds; i++) {
236 const char *name, *trig;
240 id = pdata->led[i].id;
241 name = pdata->led[i].name;
242 trig = pdata->led[i].default_trigger;
244 if ((id > devtype->led_max) || (id < devtype->led_min)) {
245 dev_err(dev, "Invalid ID %i\n", id);
249 if (init_led & (1 << id)) {
250 dev_warn(dev, "LED %i already initialized\n", id);
255 leds->led[i].id = id;
256 leds->led[i].leds = leds;
257 leds->led[i].cdev.name = name;
258 leds->led[i].cdev.default_trigger = trig;
259 leds->led[i].cdev.flags = LED_CORE_SUSPENDRESUME;
260 leds->led[i].cdev.brightness_set = mc13xxx_led_set;
261 leds->led[i].cdev.max_brightness = mc13xxx_max_brightness(id);
263 INIT_WORK(&leds->led[i].work, mc13xxx_led_work);
265 ret = led_classdev_register(dev->parent, &leds->led[i].cdev);
267 dev_err(dev, "Failed to register LED %i\n", id);
274 led_classdev_unregister(&leds->led[i].cdev);
275 cancel_work_sync(&leds->led[i].work);
281 static int mc13xxx_led_remove(struct platform_device *pdev)
283 struct mc13xxx_leds *leds = platform_get_drvdata(pdev);
286 for (i = 0; i < leds->num_leds; i++) {
287 led_classdev_unregister(&leds->led[i].cdev);
288 cancel_work_sync(&leds->led[i].work);
294 static const struct mc13xxx_led_devtype mc13783_led_devtype = {
295 .led_min = MC13783_LED_MD,
296 .led_max = MC13783_LED_B3,
301 static const struct mc13xxx_led_devtype mc13892_led_devtype = {
302 .led_min = MC13892_LED_MD,
303 .led_max = MC13892_LED_B,
308 static const struct mc13xxx_led_devtype mc34708_led_devtype = {
309 .led_min = MC34708_LED_R,
310 .led_max = MC34708_LED_G,
315 static const struct platform_device_id mc13xxx_led_id_table[] = {
316 { "mc13783-led", (kernel_ulong_t)&mc13783_led_devtype, },
317 { "mc13892-led", (kernel_ulong_t)&mc13892_led_devtype, },
318 { "mc34708-led", (kernel_ulong_t)&mc34708_led_devtype, },
321 MODULE_DEVICE_TABLE(platform, mc13xxx_led_id_table);
323 static struct platform_driver mc13xxx_led_driver = {
325 .name = "mc13xxx-led",
327 .remove = mc13xxx_led_remove,
328 .id_table = mc13xxx_led_id_table,
330 module_platform_driver_probe(mc13xxx_led_driver, mc13xxx_led_probe);
332 MODULE_DESCRIPTION("LEDs driver for Freescale MC13XXX PMIC");
333 MODULE_AUTHOR("Philippe Retornaz <philippe.retornaz@epfl.ch>");
334 MODULE_LICENSE("GPL");