1 // SPDX-License-Identifier: GPL-2.0-only
3 * LEDs driver for Freescale MC13783/MC13892/MC34708
5 * Copyright (C) 2010 Philippe Rétornaz
7 * Based on leds-da903x:
8 * Copyright (C) 2008 Compulab, Ltd.
9 * Mike Rapoport <mike@compulab.co.il>
11 * Copyright (C) 2006-2008 Marvell International Ltd.
12 * Eric Miao <eric.miao@marvell.com>
15 #include <linux/cleanup.h>
16 #include <linux/module.h>
17 #include <linux/kernel.h>
18 #include <linux/platform_device.h>
19 #include <linux/leds.h>
21 #include <linux/mfd/mc13xxx.h>
23 struct mc13xxx_led_devtype {
31 struct led_classdev cdev;
33 struct mc13xxx_leds *leds;
37 struct mc13xxx *master;
38 struct mc13xxx_led_devtype *devtype;
40 struct mc13xxx_led *led;
43 static unsigned int mc13xxx_max_brightness(int id)
45 if (id >= MC13783_LED_MD && id <= MC13783_LED_KP)
47 else if (id >= MC13783_LED_R1 && id <= MC13783_LED_B3)
53 static int mc13xxx_led_set(struct led_classdev *led_cdev,
54 enum led_brightness value)
56 struct mc13xxx_led *led =
57 container_of(led_cdev, struct mc13xxx_led, cdev);
58 struct mc13xxx_leds *leds = led->leds;
59 unsigned int reg, bank, off, shift;
66 shift = 9 + (led->id - MC13783_LED_MD) * 4;
77 off = led->id - MC13783_LED_R1;
80 shift = (off - bank * 3) * 5 + 6;
85 off = led->id - MC13892_LED_MD;
87 shift = 3 + (off - reg * 2) * 12;
92 off = led->id - MC13892_LED_R;
95 shift = (off - bank * 2) * 12 + 3;
100 shift = 3 + (led->id - MC34708_LED_R) * 12;
106 return mc13xxx_reg_rmw(leds->master, leds->devtype->ledctrl_base + reg,
107 mc13xxx_max_brightness(led->id) << shift,
112 static struct mc13xxx_leds_platform_data __init *mc13xxx_led_probe_dt(
113 struct platform_device *pdev)
115 struct mc13xxx_leds *leds = platform_get_drvdata(pdev);
116 struct mc13xxx_leds_platform_data *pdata;
117 struct device_node *child;
118 struct device *dev = &pdev->dev;
119 int i = 0, ret = -ENODATA;
121 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
123 return ERR_PTR(-ENOMEM);
125 struct device_node *parent __free(device_node) =
126 of_get_child_by_name(dev_of_node(dev->parent), "leds");
128 return ERR_PTR(-ENODATA);
130 ret = of_property_read_u32_array(parent, "led-control",
132 leds->devtype->num_regs);
136 pdata->num_leds = of_get_available_child_count(parent);
138 pdata->led = devm_kcalloc(dev, pdata->num_leds, sizeof(*pdata->led),
141 return ERR_PTR(-ENOMEM);
143 for_each_available_child_of_node(parent, child) {
147 if (of_property_read_u32(child, "reg", &tmp))
149 pdata->led[i].id = leds->devtype->led_min + tmp;
151 if (!of_property_read_string(child, "label", &str))
152 pdata->led[i].name = str;
153 if (!of_property_read_string(child, "linux,default-trigger",
155 pdata->led[i].default_trigger = str;
162 return ERR_PTR(-ENODATA);
167 static inline struct mc13xxx_leds_platform_data __init *mc13xxx_led_probe_dt(
168 struct platform_device *pdev)
170 return ERR_PTR(-ENOSYS);
174 static int __init mc13xxx_led_probe(struct platform_device *pdev)
176 struct device *dev = &pdev->dev;
177 struct mc13xxx_leds_platform_data *pdata = dev_get_platdata(dev);
178 struct mc13xxx *mcdev = dev_get_drvdata(dev->parent);
179 struct mc13xxx_led_devtype *devtype =
180 (struct mc13xxx_led_devtype *)pdev->id_entry->driver_data;
181 struct mc13xxx_leds *leds;
182 int i, id, ret = -ENODATA;
185 leds = devm_kzalloc(dev, sizeof(*leds), GFP_KERNEL);
189 leds->devtype = devtype;
190 leds->master = mcdev;
191 platform_set_drvdata(pdev, leds);
193 if (dev_of_node(dev->parent)) {
194 pdata = mc13xxx_led_probe_dt(pdev);
196 return PTR_ERR(pdata);
200 leds->num_leds = pdata->num_leds;
202 if ((leds->num_leds < 1) ||
203 (leds->num_leds > (devtype->led_max - devtype->led_min + 1))) {
204 dev_err(dev, "Invalid LED count %d\n", leds->num_leds);
208 leds->led = devm_kcalloc(dev, leds->num_leds, sizeof(*leds->led),
213 for (i = 0; i < devtype->num_regs; i++) {
214 ret = mc13xxx_reg_write(mcdev, leds->devtype->ledctrl_base + i,
215 pdata->led_control[i]);
220 for (i = 0; i < leds->num_leds; i++) {
221 const char *name, *trig;
225 id = pdata->led[i].id;
226 name = pdata->led[i].name;
227 trig = pdata->led[i].default_trigger;
229 if ((id > devtype->led_max) || (id < devtype->led_min)) {
230 dev_err(dev, "Invalid ID %i\n", id);
234 if (init_led & (1 << id)) {
235 dev_warn(dev, "LED %i already initialized\n", id);
240 leds->led[i].id = id;
241 leds->led[i].leds = leds;
242 leds->led[i].cdev.name = name;
243 leds->led[i].cdev.default_trigger = trig;
244 leds->led[i].cdev.flags = LED_CORE_SUSPENDRESUME;
245 leds->led[i].cdev.brightness_set_blocking = mc13xxx_led_set;
246 leds->led[i].cdev.max_brightness = mc13xxx_max_brightness(id);
248 ret = led_classdev_register(dev->parent, &leds->led[i].cdev);
250 dev_err(dev, "Failed to register LED %i\n", id);
257 led_classdev_unregister(&leds->led[i].cdev);
262 static void mc13xxx_led_remove(struct platform_device *pdev)
264 struct mc13xxx_leds *leds = platform_get_drvdata(pdev);
267 for (i = 0; i < leds->num_leds; i++)
268 led_classdev_unregister(&leds->led[i].cdev);
271 static const struct mc13xxx_led_devtype mc13783_led_devtype = {
272 .led_min = MC13783_LED_MD,
273 .led_max = MC13783_LED_B3,
278 static const struct mc13xxx_led_devtype mc13892_led_devtype = {
279 .led_min = MC13892_LED_MD,
280 .led_max = MC13892_LED_B,
285 static const struct mc13xxx_led_devtype mc34708_led_devtype = {
286 .led_min = MC34708_LED_R,
287 .led_max = MC34708_LED_G,
292 static const struct platform_device_id mc13xxx_led_id_table[] = {
293 { "mc13783-led", (kernel_ulong_t)&mc13783_led_devtype, },
294 { "mc13892-led", (kernel_ulong_t)&mc13892_led_devtype, },
295 { "mc34708-led", (kernel_ulong_t)&mc34708_led_devtype, },
298 MODULE_DEVICE_TABLE(platform, mc13xxx_led_id_table);
300 static struct platform_driver mc13xxx_led_driver = {
302 .name = "mc13xxx-led",
304 .remove_new = mc13xxx_led_remove,
305 .id_table = mc13xxx_led_id_table,
307 module_platform_driver_probe(mc13xxx_led_driver, mc13xxx_led_probe);
309 MODULE_DESCRIPTION("LEDs driver for Freescale MC13XXX PMIC");
310 MODULE_AUTHOR("Philippe Retornaz <philippe.retornaz@epfl.ch>");
311 MODULE_LICENSE("GPL");