Initial import

1 files changed, 334 insertions, 0 deletions

diff --git a/drivers/leds/leds-mc13783.c b/drivers/leds/leds-mc13783.c
new file mode 100644
index 000000000..e2b847fe2
--- /dev/null
+++ b/drivers/leds/leds-mc13783.c
@@ -0,0 +1,334 @@
+/*
+ * LEDs driver for Freescale MC13783/MC13892/MC34708
+ *
+ * Copyright (C) 2010 Philippe Rétornaz
+ *
+ * Based on leds-da903x:
+ * Copyright (C) 2008 Compulab, Ltd.
+ *      Mike Rapoport <mike@compulab.co.il>
+ *
+ * Copyright (C) 2006-2008 Marvell International Ltd.
+ *      Eric Miao <eric.miao@marvell.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/leds.h>
+#include <linux/of.h>
+#include <linux/workqueue.h>
+#include <linux/mfd/mc13xxx.h>
+
+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;
+	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;
+};
+
+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);
+	struct mc13xxx_leds *leds = led->leds;
+	unsigned int reg, bank, off, shift;
+
+	switch (led->id) {
+	case MC13783_LED_MD:
+	case MC13783_LED_AD:
+	case MC13783_LED_KP:
+		reg = 2;
+		shift = 9 + (led->id - MC13783_LED_MD) * 4;
+		break;
+	case MC13783_LED_R1:
+	case MC13783_LED_G1:
+	case MC13783_LED_B1:
+	case MC13783_LED_R2:
+	case MC13783_LED_G2:
+	case MC13783_LED_B2:
+	case MC13783_LED_R3:
+	case MC13783_LED_G3:
+	case MC13783_LED_B3:
+		off = led->id - MC13783_LED_R1;
+		bank = off / 3;
+		reg = 3 + bank;
+		shift = (off - bank * 3) * 5 + 6;
+		break;
+	case MC13892_LED_MD:
+	case MC13892_LED_AD:
+	case MC13892_LED_KP:
+		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 = 2 + bank;
+		shift = (off - bank * 2) * 12 + 3;
+		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(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,
+			    enum led_brightness value)
+{
+	struct mc13xxx_led *led =
+		container_of(led_cdev, struct mc13xxx_led, cdev);
+
+	led->new_brightness = value;
+	schedule_work(&led->work);
+}
+
+#ifdef CONFIG_OF
+static struct mc13xxx_leds_platform_data __init *mc13xxx_led_probe_dt(
+	struct platform_device *pdev)
+{
+	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);
+
+	parent = of_get_child_by_name(dev->parent->of_node, "leds");
+	if (!parent)
+		goto out_node_put;
+
+	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;
+	}
+
+	for_each_child_of_node(parent, child) {
+		const char *str;
+		u32 tmp;
+
+		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++;
+	}
+
+	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->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++) {
+		ret = mc13xxx_reg_write(mcdev, leds->devtype->ledctrl_base + i,
+					pdata->led_control[i]);
+		if (ret)
+			return ret;
+	}
+
+	for (i = 0; i < leds->num_leds; i++) {
+		const char *name, *trig;
+
+		ret = -EINVAL;
+
+		id = pdata->led[i].id;
+		name = pdata->led[i].name;
+		trig = pdata->led[i].default_trigger;
+
+		if ((id > devtype->led_max) || (id < devtype->led_min)) {
+			dev_err(dev, "Invalid ID %i\n", id);
+			break;
+		}
+
+		if (init_led & (1 << id)) {
+			dev_warn(dev, "LED %i already initialized\n", id);
+			break;
+		}
+
+		init_led |= 1 << id;
+		leds->led[i].id = id;
+		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.max_brightness = mc13xxx_max_brightness(id);
+
+		INIT_WORK(&leds->led[i].work, mc13xxx_led_work);
+
+		ret = led_classdev_register(dev->parent, &leds->led[i].cdev);
+		if (ret) {
+			dev_err(dev, "Failed to register LED %i\n", id);
+			break;
+		}
+	}
+
+	if (ret)
+		while (--i >= 0) {
+			led_classdev_unregister(&leds->led[i].cdev);
+			cancel_work_sync(&leds->led[i].work);
+		}
+
+	return ret;
+}
+
+static int mc13xxx_led_remove(struct platform_device *pdev)
+{
+	struct mc13xxx_leds *leds = platform_get_drvdata(pdev);
+	int i;
+
+	for (i = 0; i < leds->num_leds; i++) {
+		led_classdev_unregister(&leds->led[i].cdev);
+		cancel_work_sync(&leds->led[i].work);
+	}
+
+	return 0;
+}
+
+static const struct mc13xxx_led_devtype mc13783_led_devtype = {
+	.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);
+
+static struct platform_driver mc13xxx_led_driver = {
+	.driver	= {
+		.name	= "mc13xxx-led",
+	},
+	.remove		= mc13xxx_led_remove,
+	.id_table	= mc13xxx_led_id_table,
+};
+module_platform_driver_probe(mc13xxx_led_driver, mc13xxx_led_probe);
+
+MODULE_DESCRIPTION("LEDs driver for Freescale MC13XXX PMIC");
+MODULE_AUTHOR("Philippe Retornaz <philippe.retornaz@epfl.ch>");
+MODULE_LICENSE("GPL");