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.
10 * Copyright (C) 2006-2008 Marvell International Ltd.
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/mfd/mc13xxx.h>
25 struct mc13xxx_led_devtype {
33 struct led_classdev cdev;
35 struct mc13xxx_leds *leds;
39 struct mc13xxx *master;
40 struct mc13xxx_led_devtype *devtype;
42 struct mc13xxx_led *led;
45 static unsigned int mc13xxx_max_brightness(int id)
47 if (id >= MC13783_LED_MD && id <= MC13783_LED_KP)
49 else if (id >= MC13783_LED_R1 && id <= MC13783_LED_B3)
55 static int mc13xxx_led_set(struct led_classdev *led_cdev,
56 enum led_brightness value)
58 struct mc13xxx_led *led =
59 container_of(led_cdev, struct mc13xxx_led, cdev);
60 struct mc13xxx_leds *leds = led->leds;
61 unsigned int reg, bank, off, shift;
68 shift = 9 + (led->id - MC13783_LED_MD) * 4;
79 off = led->id - MC13783_LED_R1;
82 shift = (off - bank * 3) * 5 + 6;
87 reg = (led->id - MC13892_LED_MD) / 2;
88 shift = 3 + (led->id - MC13892_LED_MD) * 12;
93 off = led->id - MC13892_LED_R;
96 shift = (off - bank * 2) * 12 + 3;
101 shift = 3 + (led->id - MC34708_LED_R) * 12;
107 return mc13xxx_reg_rmw(leds->master, leds->devtype->ledctrl_base + reg,
108 mc13xxx_max_brightness(led->id) << shift,
113 static struct mc13xxx_leds_platform_data __init *mc13xxx_led_probe_dt(
114 struct platform_device *pdev)
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;
122 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
124 return ERR_PTR(-ENOMEM);
126 parent = of_get_child_by_name(dev->parent->of_node, "leds");
130 ret = of_property_read_u32_array(parent, "led-control",
132 leds->devtype->num_regs);
136 pdata->num_leds = of_get_child_count(parent);
138 pdata->led = devm_kzalloc(dev, pdata->num_leds * sizeof(*pdata->led),
145 for_each_child_of_node(parent, child) {
149 if (of_property_read_u32(child, "reg", &tmp))
151 pdata->led[i].id = leds->devtype->led_min + tmp;
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",
157 pdata->led[i].default_trigger = str;
163 ret = i > 0 ? 0 : -ENODATA;
168 return ret ? ERR_PTR(ret) : pdata;
171 static inline struct mc13xxx_leds_platform_data __init *mc13xxx_led_probe_dt(
172 struct platform_device *pdev)
174 return ERR_PTR(-ENOSYS);
178 static int __init mc13xxx_led_probe(struct platform_device *pdev)
180 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);
183 struct mc13xxx_led_devtype *devtype =
184 (struct mc13xxx_led_devtype *)pdev->id_entry->driver_data;
185 struct mc13xxx_leds *leds;
186 int i, id, ret = -ENODATA;
189 leds = devm_kzalloc(dev, sizeof(*leds), GFP_KERNEL);
193 leds->devtype = devtype;
194 leds->master = mcdev;
195 platform_set_drvdata(pdev, leds);
197 if (dev->parent->of_node) {
198 pdata = mc13xxx_led_probe_dt(pdev);
200 return PTR_ERR(pdata);
204 leds->num_leds = pdata->num_leds;
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);
212 leds->led = devm_kzalloc(dev, leds->num_leds * sizeof(*leds->led),
217 for (i = 0; i < devtype->num_regs; i++) {
218 ret = mc13xxx_reg_write(mcdev, leds->devtype->ledctrl_base + i,
219 pdata->led_control[i]);
224 for (i = 0; i < leds->num_leds; i++) {
225 const char *name, *trig;
229 id = pdata->led[i].id;
230 name = pdata->led[i].name;
231 trig = pdata->led[i].default_trigger;
233 if ((id > devtype->led_max) || (id < devtype->led_min)) {
234 dev_err(dev, "Invalid ID %i\n", id);
238 if (init_led & (1 << id)) {
239 dev_warn(dev, "LED %i already initialized\n", id);
244 leds->led[i].id = id;
245 leds->led[i].leds = leds;
246 leds->led[i].cdev.name = name;
247 leds->led[i].cdev.default_trigger = trig;
248 leds->led[i].cdev.flags = LED_CORE_SUSPENDRESUME;
249 leds->led[i].cdev.brightness_set_blocking = mc13xxx_led_set;
250 leds->led[i].cdev.max_brightness = mc13xxx_max_brightness(id);
252 ret = led_classdev_register(dev->parent, &leds->led[i].cdev);
254 dev_err(dev, "Failed to register LED %i\n", id);
261 led_classdev_unregister(&leds->led[i].cdev);
266 static int mc13xxx_led_remove(struct platform_device *pdev)
268 struct mc13xxx_leds *leds = platform_get_drvdata(pdev);
271 for (i = 0; i < leds->num_leds; i++)
272 led_classdev_unregister(&leds->led[i].cdev);
277 static const struct mc13xxx_led_devtype mc13783_led_devtype = {
278 .led_min = MC13783_LED_MD,
279 .led_max = MC13783_LED_B3,
284 static const struct mc13xxx_led_devtype mc13892_led_devtype = {
285 .led_min = MC13892_LED_MD,
286 .led_max = MC13892_LED_B,
291 static const struct mc13xxx_led_devtype mc34708_led_devtype = {
292 .led_min = MC34708_LED_R,
293 .led_max = MC34708_LED_G,
298 static const struct platform_device_id mc13xxx_led_id_table[] = {
299 { "mc13783-led", (kernel_ulong_t)&mc13783_led_devtype, },
300 { "mc13892-led", (kernel_ulong_t)&mc13892_led_devtype, },
301 { "mc34708-led", (kernel_ulong_t)&mc34708_led_devtype, },
304 MODULE_DEVICE_TABLE(platform, mc13xxx_led_id_table);
306 static struct platform_driver mc13xxx_led_driver = {
308 .name = "mc13xxx-led",
310 .remove = mc13xxx_led_remove,
311 .id_table = mc13xxx_led_id_table,
313 module_platform_driver_probe(mc13xxx_led_driver, mc13xxx_led_probe);
315 MODULE_DESCRIPTION("LEDs driver for Freescale MC13XXX PMIC");
317 MODULE_LICENSE("GPL");