/*
- * LEDs driver for Freescale MC13783/MC13892
+ * LEDs driver for Freescale MC13783/MC13892/MC34708
*
* Copyright (C) 2010 Philippe Rétornaz
*
#include <linux/module.h>
#include <linux/kernel.h>
-#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/leds.h>
+#include <linux/of.h>
#include <linux/workqueue.h>
#include <linux/mfd/mc13xxx.h>
-#define MC13XXX_REG_LED_CONTROL(x) (51 + (x))
-
struct mc13xxx_led_devtype {
int led_min;
int led_max;
int num_regs;
+ u32 ledctrl_base;
};
struct mc13xxx_led {
struct led_classdev cdev;
struct work_struct work;
- struct mc13xxx *master;
enum led_brightness new_brightness;
int id;
+ struct mc13xxx_leds *leds;
};
struct mc13xxx_leds {
+ struct mc13xxx *master;
struct mc13xxx_led_devtype *devtype;
int num_leds;
- struct mc13xxx_led led[0];
+ struct mc13xxx_led *led;
};
+static unsigned int mc13xxx_max_brightness(int id)
+{
+ if (id >= MC13783_LED_MD && id <= MC13783_LED_KP)
+ return 0x0f;
+ else if (id >= MC13783_LED_R1 && id <= MC13783_LED_B3)
+ return 0x1f;
+
+ return 0x3f;
+}
+
static void mc13xxx_led_work(struct work_struct *work)
{
struct mc13xxx_led *led = container_of(work, struct mc13xxx_led, work);
- int reg, mask, value, bank, off, shift;
+ struct mc13xxx_leds *leds = led->leds;
+ unsigned int reg, bank, off, shift;
switch (led->id) {
case MC13783_LED_MD:
- reg = MC13XXX_REG_LED_CONTROL(2);
- shift = 9;
- mask = 0x0f;
- value = led->new_brightness >> 4;
- break;
case MC13783_LED_AD:
- reg = MC13XXX_REG_LED_CONTROL(2);
- shift = 13;
- mask = 0x0f;
- value = led->new_brightness >> 4;
- break;
case MC13783_LED_KP:
- reg = MC13XXX_REG_LED_CONTROL(2);
- shift = 17;
- mask = 0x0f;
- value = led->new_brightness >> 4;
+ reg = 2;
+ shift = 9 + (led->id - MC13783_LED_MD) * 4;
break;
case MC13783_LED_R1:
case MC13783_LED_G1:
case MC13783_LED_B3:
off = led->id - MC13783_LED_R1;
bank = off / 3;
- reg = MC13XXX_REG_LED_CONTROL(3) + bank;
+ reg = 3 + bank;
shift = (off - bank * 3) * 5 + 6;
- value = led->new_brightness >> 3;
- mask = 0x1f;
break;
case MC13892_LED_MD:
- reg = MC13XXX_REG_LED_CONTROL(0);
- shift = 3;
- mask = 0x3f;
- value = led->new_brightness >> 2;
- break;
case MC13892_LED_AD:
- reg = MC13XXX_REG_LED_CONTROL(0);
- shift = 15;
- mask = 0x3f;
- value = led->new_brightness >> 2;
- break;
case MC13892_LED_KP:
- reg = MC13XXX_REG_LED_CONTROL(1);
- shift = 3;
- mask = 0x3f;
- value = led->new_brightness >> 2;
+ reg = (led->id - MC13892_LED_MD) / 2;
+ shift = 3 + (led->id - MC13892_LED_MD) * 12;
break;
case MC13892_LED_R:
case MC13892_LED_G:
case MC13892_LED_B:
off = led->id - MC13892_LED_R;
bank = off / 2;
- reg = MC13XXX_REG_LED_CONTROL(2) + bank;
+ reg = 2 + bank;
shift = (off - bank * 2) * 12 + 3;
- value = led->new_brightness >> 2;
- mask = 0x3f;
+ break;
+ case MC34708_LED_R:
+ case MC34708_LED_G:
+ reg = 0;
+ shift = 3 + (led->id - MC34708_LED_R) * 12;
break;
default:
BUG();
}
- mc13xxx_reg_rmw(led->master, reg, mask << shift, value << shift);
+ mc13xxx_reg_rmw(leds->master, leds->devtype->ledctrl_base + reg,
+ mc13xxx_max_brightness(led->id) << shift,
+ led->new_brightness << shift);
}
static void mc13xxx_led_set(struct led_classdev *led_cdev,
schedule_work(&led->work);
}
-static int __init mc13xxx_led_probe(struct platform_device *pdev)
+#ifdef CONFIG_OF
+static struct mc13xxx_leds_platform_data __init *mc13xxx_led_probe_dt(
+ struct platform_device *pdev)
{
- struct mc13xxx_leds_platform_data *pdata = dev_get_platdata(&pdev->dev);
- struct mc13xxx *mcdev = dev_get_drvdata(pdev->dev.parent);
- struct mc13xxx_led_devtype *devtype =
- (struct mc13xxx_led_devtype *)pdev->id_entry->driver_data;
- struct mc13xxx_leds *leds;
- int i, id, num_leds, ret = -ENODATA;
- u32 reg, init_led = 0;
+ struct mc13xxx_leds *leds = platform_get_drvdata(pdev);
+ struct mc13xxx_leds_platform_data *pdata;
+ struct device_node *parent, *child;
+ struct device *dev = &pdev->dev;
+ int i = 0, ret = -ENODATA;
+
+ pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+ if (!pdata)
+ return ERR_PTR(-ENOMEM);
+
+ of_node_get(dev->parent->of_node);
+
+ parent = of_find_node_by_name(dev->parent->of_node, "leds");
+ if (!parent)
+ goto out_node_put;
- if (!pdata) {
- dev_err(&pdev->dev, "Missing platform data\n");
- return -ENODEV;
+ ret = of_property_read_u32_array(parent, "led-control",
+ pdata->led_control,
+ leds->devtype->num_regs);
+ if (ret)
+ goto out_node_put;
+
+ pdata->num_leds = of_get_child_count(parent);
+
+ pdata->led = devm_kzalloc(dev, pdata->num_leds * sizeof(*pdata->led),
+ GFP_KERNEL);
+ if (!pdata->led) {
+ ret = -ENOMEM;
+ goto out_node_put;
}
- num_leds = pdata->num_leds;
+ for_each_child_of_node(parent, child) {
+ const char *str;
+ u32 tmp;
- if ((num_leds < 1) ||
- (num_leds > (devtype->led_max - devtype->led_min + 1))) {
- dev_err(&pdev->dev, "Invalid LED count %d\n", num_leds);
- return -EINVAL;
+ if (of_property_read_u32(child, "reg", &tmp))
+ continue;
+ pdata->led[i].id = leds->devtype->led_min + tmp;
+
+ if (!of_property_read_string(child, "label", &str))
+ pdata->led[i].name = str;
+ if (!of_property_read_string(child, "linux,default-trigger",
+ &str))
+ pdata->led[i].default_trigger = str;
+
+ i++;
}
- leds = devm_kzalloc(&pdev->dev, num_leds * sizeof(struct mc13xxx_led) +
- sizeof(struct mc13xxx_leds), GFP_KERNEL);
+ pdata->num_leds = i;
+ ret = i > 0 ? 0 : -ENODATA;
+
+out_node_put:
+ of_node_put(parent);
+
+ return ret ? ERR_PTR(ret) : pdata;
+}
+#else
+static inline struct mc13xxx_leds_platform_data __init *mc13xxx_led_probe_dt(
+ struct platform_device *pdev)
+{
+ return ERR_PTR(-ENOSYS);
+}
+#endif
+
+static int __init mc13xxx_led_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct mc13xxx_leds_platform_data *pdata = dev_get_platdata(dev);
+ struct mc13xxx *mcdev = dev_get_drvdata(dev->parent);
+ struct mc13xxx_led_devtype *devtype =
+ (struct mc13xxx_led_devtype *)pdev->id_entry->driver_data;
+ struct mc13xxx_leds *leds;
+ int i, id, ret = -ENODATA;
+ u32 init_led = 0;
+
+ leds = devm_kzalloc(dev, sizeof(*leds), GFP_KERNEL);
if (!leds)
return -ENOMEM;
leds->devtype = devtype;
- leds->num_leds = num_leds;
+ leds->master = mcdev;
platform_set_drvdata(pdev, leds);
+ if (dev->parent->of_node) {
+ pdata = mc13xxx_led_probe_dt(pdev);
+ if (IS_ERR(pdata))
+ return PTR_ERR(pdata);
+ } else if (!pdata)
+ return -ENODATA;
+
+ leds->num_leds = pdata->num_leds;
+
+ if ((leds->num_leds < 1) ||
+ (leds->num_leds > (devtype->led_max - devtype->led_min + 1))) {
+ dev_err(dev, "Invalid LED count %d\n", leds->num_leds);
+ return -EINVAL;
+ }
+
+ leds->led = devm_kzalloc(dev, leds->num_leds * sizeof(*leds->led),
+ GFP_KERNEL);
+ if (!leds->led)
+ return -ENOMEM;
+
for (i = 0; i < devtype->num_regs; i++) {
- reg = pdata->led_control[i];
- WARN_ON(reg >= (1 << 24));
- ret = mc13xxx_reg_write(mcdev, MC13XXX_REG_LED_CONTROL(i), reg);
+ ret = mc13xxx_reg_write(mcdev, leds->devtype->ledctrl_base + i,
+ pdata->led_control[i]);
if (ret)
return ret;
}
- for (i = 0; i < num_leds; i++) {
+ for (i = 0; i < leds->num_leds; i++) {
const char *name, *trig;
ret = -EINVAL;
trig = pdata->led[i].default_trigger;
if ((id > devtype->led_max) || (id < devtype->led_min)) {
- dev_err(&pdev->dev, "Invalid ID %i\n", id);
+ dev_err(dev, "Invalid ID %i\n", id);
break;
}
if (init_led & (1 << id)) {
- dev_warn(&pdev->dev,
- "LED %i already initialized\n", id);
+ dev_warn(dev, "LED %i already initialized\n", id);
break;
}
init_led |= 1 << id;
leds->led[i].id = id;
- leds->led[i].master = mcdev;
+ leds->led[i].leds = leds;
leds->led[i].cdev.name = name;
leds->led[i].cdev.default_trigger = trig;
+ leds->led[i].cdev.flags = LED_CORE_SUSPENDRESUME;
leds->led[i].cdev.brightness_set = mc13xxx_led_set;
- leds->led[i].cdev.brightness = LED_OFF;
+ leds->led[i].cdev.max_brightness = mc13xxx_max_brightness(id);
INIT_WORK(&leds->led[i].work, mc13xxx_led_work);
- ret = led_classdev_register(pdev->dev.parent,
- &leds->led[i].cdev);
+ ret = led_classdev_register(dev->parent, &leds->led[i].cdev);
if (ret) {
- dev_err(&pdev->dev, "Failed to register LED %i\n", id);
+ dev_err(dev, "Failed to register LED %i\n", id);
break;
}
}
static int mc13xxx_led_remove(struct platform_device *pdev)
{
- struct mc13xxx *mcdev = dev_get_drvdata(pdev->dev.parent);
struct mc13xxx_leds *leds = platform_get_drvdata(pdev);
int i;
cancel_work_sync(&leds->led[i].work);
}
- for (i = 0; i < leds->devtype->num_regs; i++)
- mc13xxx_reg_write(mcdev, MC13XXX_REG_LED_CONTROL(i), 0);
-
return 0;
}
.led_min = MC13783_LED_MD,
.led_max = MC13783_LED_B3,
.num_regs = 6,
+ .ledctrl_base = 51,
};
static const struct mc13xxx_led_devtype mc13892_led_devtype = {
.led_min = MC13892_LED_MD,
.led_max = MC13892_LED_B,
.num_regs = 4,
+ .ledctrl_base = 51,
+};
+
+static const struct mc13xxx_led_devtype mc34708_led_devtype = {
+ .led_min = MC34708_LED_R,
+ .led_max = MC34708_LED_G,
+ .num_regs = 1,
+ .ledctrl_base = 54,
};
static const struct platform_device_id mc13xxx_led_id_table[] = {
{ "mc13783-led", (kernel_ulong_t)&mc13783_led_devtype, },
{ "mc13892-led", (kernel_ulong_t)&mc13892_led_devtype, },
+ { "mc34708-led", (kernel_ulong_t)&mc34708_led_devtype, },
{ }
};
MODULE_DEVICE_TABLE(platform, mc13xxx_led_id_table);
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