1 files changed, 523 insertions, 0 deletions
diff --git a/drivers/leds/leds-lp55xx-common.c b/drivers/leds/leds-lp55xx-common.c
new file mode 100644
index 0000000..d9eb841
--- /dev/null
+++ b/drivers/leds/leds-lp55xx-common.c
@@ -0,0 +1,523 @@
+/*
+ * LP5521/LP5523/LP55231 Common Driver
+ *
+ * Copyright 2012 Texas Instruments
+ *
+ * Author: Milo(Woogyom) Kim <milo.kim@ti.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.
+ *
+ * Derived from leds-lp5521.c, leds-lp5523.c
+ */
+
+#include <linux/delay.h>
+#include <linux/firmware.h>
+#include <linux/i2c.h>
+#include <linux/leds.h>
+#include <linux/module.h>
+#include <linux/platform_data/leds-lp55xx.h>
+
+#include "leds-lp55xx-common.h"
+
+static struct lp55xx_led *cdev_to_lp55xx_led(struct led_classdev *cdev)
+{
+	return container_of(cdev, struct lp55xx_led, cdev);
+}
+
+static struct lp55xx_led *dev_to_lp55xx_led(struct device *dev)
+{
+	return cdev_to_lp55xx_led(dev_get_drvdata(dev));
+}
+
+static void lp55xx_reset_device(struct lp55xx_chip *chip)
+{
+	struct lp55xx_device_config *cfg = chip->cfg;
+	u8 addr = cfg->reset.addr;
+	u8 val  = cfg->reset.val;
+
+	/* no error checking here because no ACK from the device after reset */
+	lp55xx_write(chip, addr, val);
+}
+
+static int lp55xx_detect_device(struct lp55xx_chip *chip)
+{
+	struct lp55xx_device_config *cfg = chip->cfg;
+	u8 addr = cfg->enable.addr;
+	u8 val  = cfg->enable.val;
+	int ret;
+
+	ret = lp55xx_write(chip, addr, val);
+	if (ret)
+		return ret;
+
+	usleep_range(1000, 2000);
+
+	ret = lp55xx_read(chip, addr, &val);
+	if (ret)
+		return ret;
+
+	if (val != cfg->enable.val)
+		return -ENODEV;
+
+	return 0;
+}
+
+static int lp55xx_post_init_device(struct lp55xx_chip *chip)
+{
+	struct lp55xx_device_config *cfg = chip->cfg;
+
+	if (!cfg->post_init_device)
+		return 0;
+
+	return cfg->post_init_device(chip);
+}
+
+static ssize_t lp55xx_show_current(struct device *dev,
+			    struct device_attribute *attr,
+			    char *buf)
+{
+	struct lp55xx_led *led = dev_to_lp55xx_led(dev);
+
+	return sprintf(buf, "%d\n", led->led_current);
+}
+
+static ssize_t lp55xx_store_current(struct device *dev,
+			     struct device_attribute *attr,
+			     const char *buf, size_t len)
+{
+	struct lp55xx_led *led = dev_to_lp55xx_led(dev);
+	struct lp55xx_chip *chip = led->chip;
+	unsigned long curr;
+
+	if (kstrtoul(buf, 0, &curr))
+		return -EINVAL;
+
+	if (curr > led->max_current)
+		return -EINVAL;
+
+	if (!chip->cfg->set_led_current)
+		return len;
+
+	mutex_lock(&chip->lock);
+	chip->cfg->set_led_current(led, (u8)curr);
+	mutex_unlock(&chip->lock);
+
+	return len;
+}
+
+static ssize_t lp55xx_show_max_current(struct device *dev,
+			    struct device_attribute *attr,
+			    char *buf)
+{
+	struct lp55xx_led *led = dev_to_lp55xx_led(dev);
+
+	return sprintf(buf, "%d\n", led->max_current);
+}
+
+static DEVICE_ATTR(led_current, S_IRUGO | S_IWUSR, lp55xx_show_current,
+		lp55xx_store_current);
+static DEVICE_ATTR(max_current, S_IRUGO , lp55xx_show_max_current, NULL);
+
+static struct attribute *lp55xx_led_attributes[] = {
+	&dev_attr_led_current.attr,
+	&dev_attr_max_current.attr,
+	NULL,
+};
+
+static struct attribute_group lp55xx_led_attr_group = {
+	.attrs = lp55xx_led_attributes
+};
+
+static void lp55xx_set_brightness(struct led_classdev *cdev,
+			     enum led_brightness brightness)
+{
+	struct lp55xx_led *led = cdev_to_lp55xx_led(cdev);
+
+	led->brightness = (u8)brightness;
+	schedule_work(&led->brightness_work);
+}
+
+static int lp55xx_init_led(struct lp55xx_led *led,
+			struct lp55xx_chip *chip, int chan)
+{
+	struct lp55xx_platform_data *pdata = chip->pdata;
+	struct lp55xx_device_config *cfg = chip->cfg;
+	struct device *dev = &chip->cl->dev;
+	char name[32];
+	int ret;
+	int max_channel = cfg->max_channel;
+
+	if (chan >= max_channel) {
+		dev_err(dev, "invalid channel: %d / %d\n", chan, max_channel);
+		return -EINVAL;
+	}
+
+	if (pdata->led_config[chan].led_current == 0)
+		return 0;
+
+	led->led_current = pdata->led_config[chan].led_current;
+	led->max_current = pdata->led_config[chan].max_current;
+	led->chan_nr = pdata->led_config[chan].chan_nr;
+
+	if (led->chan_nr >= max_channel) {
+		dev_err(dev, "Use channel numbers between 0 and %d\n",
+			max_channel - 1);
+		return -EINVAL;
+	}
+
+	led->cdev.brightness_set = lp55xx_set_brightness;
+
+	if (pdata->led_config[chan].name) {
+		led->cdev.name = pdata->led_config[chan].name;
+	} else {
+		snprintf(name, sizeof(name), "%s:channel%d",
+			pdata->label ? : chip->cl->name, chan);
+		led->cdev.name = name;
+	}
+
+	/*
+	 * register led class device for each channel and
+	 * add device attributes
+	 */
+
+	ret = led_classdev_register(dev, &led->cdev);
+	if (ret) {
+		dev_err(dev, "led register err: %d\n", ret);
+		return ret;
+	}
+
+	ret = sysfs_create_group(&led->cdev.dev->kobj, &lp55xx_led_attr_group);
+	if (ret) {
+		dev_err(dev, "led sysfs err: %d\n", ret);
+		led_classdev_unregister(&led->cdev);
+		return ret;
+	}
+
+	return 0;
+}
+
+static void lp55xx_firmware_loaded(const struct firmware *fw, void *context)
+{
+	struct lp55xx_chip *chip = context;
+	struct device *dev = &chip->cl->dev;
+
+	if (!fw) {
+		dev_err(dev, "firmware request failed\n");
+		goto out;
+	}
+
+	/* handling firmware data is chip dependent */
+	mutex_lock(&chip->lock);
+
+	chip->fw = fw;
+	if (chip->cfg->firmware_cb)
+		chip->cfg->firmware_cb(chip);
+
+	mutex_unlock(&chip->lock);
+
+out:
+	/* firmware should be released for other channel use */
+	release_firmware(chip->fw);
+}
+
+static int lp55xx_request_firmware(struct lp55xx_chip *chip)
+{
+	const char *name = chip->cl->name;
+	struct device *dev = &chip->cl->dev;
+
+	return request_firmware_nowait(THIS_MODULE, true, name, dev,
+				GFP_KERNEL, chip, lp55xx_firmware_loaded);
+}
+
+static ssize_t lp55xx_show_engine_select(struct device *dev,
+			    struct device_attribute *attr,
+			    char *buf)
+{
+	struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
+	struct lp55xx_chip *chip = led->chip;
+
+	return sprintf(buf, "%d\n", chip->engine_idx);
+}
+
+static ssize_t lp55xx_store_engine_select(struct device *dev,
+			     struct device_attribute *attr,
+			     const char *buf, size_t len)
+{
+	struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
+	struct lp55xx_chip *chip = led->chip;
+	unsigned long val;
+	int ret;
+
+	if (kstrtoul(buf, 0, &val))
+		return -EINVAL;
+
+	/* select the engine to be run */
+
+	switch (val) {
+	case LP55XX_ENGINE_1:
+	case LP55XX_ENGINE_2:
+	case LP55XX_ENGINE_3:
+		mutex_lock(&chip->lock);
+		chip->engine_idx = val;
+		ret = lp55xx_request_firmware(chip);
+		mutex_unlock(&chip->lock);
+		break;
+	default:
+		dev_err(dev, "%lu: invalid engine index. (1, 2, 3)\n", val);
+		return -EINVAL;
+	}
+
+	if (ret) {
+		dev_err(dev, "request firmware err: %d\n", ret);
+		return ret;
+	}
+
+	return len;
+}
+
+static inline void lp55xx_run_engine(struct lp55xx_chip *chip, bool start)
+{
+	if (chip->cfg->run_engine)
+		chip->cfg->run_engine(chip, start);
+}
+
+static ssize_t lp55xx_store_engine_run(struct device *dev,
+			     struct device_attribute *attr,
+			     const char *buf, size_t len)
+{
+	struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
+	struct lp55xx_chip *chip = led->chip;
+	unsigned long val;
+
+	if (kstrtoul(buf, 0, &val))
+		return -EINVAL;
+
+	/* run or stop the selected engine */
+
+	if (val <= 0) {
+		lp55xx_run_engine(chip, false);
+		return len;
+	}
+
+	mutex_lock(&chip->lock);
+	lp55xx_run_engine(chip, true);
+	mutex_unlock(&chip->lock);
+
+	return len;
+}
+
+static DEVICE_ATTR(select_engine, S_IRUGO | S_IWUSR,
+		   lp55xx_show_engine_select, lp55xx_store_engine_select);
+static DEVICE_ATTR(run_engine, S_IWUSR, NULL, lp55xx_store_engine_run);
+
+static struct attribute *lp55xx_engine_attributes[] = {
+	&dev_attr_select_engine.attr,
+	&dev_attr_run_engine.attr,
+	NULL,
+};
+
+static const struct attribute_group lp55xx_engine_attr_group = {
+	.attrs = lp55xx_engine_attributes,
+};
+
+int lp55xx_write(struct lp55xx_chip *chip, u8 reg, u8 val)
+{
+	return i2c_smbus_write_byte_data(chip->cl, reg, val);
+}
+EXPORT_SYMBOL_GPL(lp55xx_write);
+
+int lp55xx_read(struct lp55xx_chip *chip, u8 reg, u8 *val)
+{
+	s32 ret;
+
+	ret = i2c_smbus_read_byte_data(chip->cl, reg);
+	if (ret < 0)
+		return ret;
+
+	*val = ret;
+	return 0;
+}
+EXPORT_SYMBOL_GPL(lp55xx_read);
+
+int lp55xx_update_bits(struct lp55xx_chip *chip, u8 reg, u8 mask, u8 val)
+{
+	int ret;
+	u8 tmp;
+
+	ret = lp55xx_read(chip, reg, &tmp);
+	if (ret)
+		return ret;
+
+	tmp &= ~mask;
+	tmp |= val & mask;
+
+	return lp55xx_write(chip, reg, tmp);
+}
+EXPORT_SYMBOL_GPL(lp55xx_update_bits);
+
+int lp55xx_init_device(struct lp55xx_chip *chip)
+{
+	struct lp55xx_platform_data *pdata;
+	struct lp55xx_device_config *cfg;
+	struct device *dev = &chip->cl->dev;
+	int ret = 0;
+
+	WARN_ON(!chip);
+
+	pdata = chip->pdata;
+	cfg = chip->cfg;
+
+	if (!pdata || !cfg)
+		return -EINVAL;
+
+	if (pdata->setup_resources) {
+		ret = pdata->setup_resources();
+		if (ret < 0) {
+			dev_err(dev, "setup resoure err: %d\n", ret);
+			goto err;
+		}
+	}
+
+	if (pdata->enable) {
+		pdata->enable(0);
+		usleep_range(1000, 2000); /* Keep enable down at least 1ms */
+		pdata->enable(1);
+		usleep_range(1000, 2000); /* 500us abs min. */
+	}
+
+	lp55xx_reset_device(chip);
+
+	/*
+	 * Exact value is not available. 10 - 20ms
+	 * appears to be enough for reset.
+	 */
+	usleep_range(10000, 20000);
+
+	ret = lp55xx_detect_device(chip);
+	if (ret) {
+		dev_err(dev, "device detection err: %d\n", ret);
+		goto err;
+	}
+
+	/* chip specific initialization */
+	ret = lp55xx_post_init_device(chip);
+	if (ret) {
+		dev_err(dev, "post init device err: %d\n", ret);
+		goto err_post_init;
+	}
+
+	return 0;
+
+err_post_init:
+	lp55xx_deinit_device(chip);
+err:
+	return ret;
+}
+EXPORT_SYMBOL_GPL(lp55xx_init_device);
+
+void lp55xx_deinit_device(struct lp55xx_chip *chip)
+{
+	struct lp55xx_platform_data *pdata = chip->pdata;
+
+	if (pdata->enable)
+		pdata->enable(0);
+
+	if (pdata->release_resources)
+		pdata->release_resources();
+}
+EXPORT_SYMBOL_GPL(lp55xx_deinit_device);
+
+int lp55xx_register_leds(struct lp55xx_led *led, struct lp55xx_chip *chip)
+{
+	struct lp55xx_platform_data *pdata = chip->pdata;
+	struct lp55xx_device_config *cfg = chip->cfg;
+	int num_channels = pdata->num_channels;
+	struct lp55xx_led *each;
+	u8 led_current;
+	int ret;
+	int i;
+
+	if (!cfg->brightness_work_fn) {
+		dev_err(&chip->cl->dev, "empty brightness configuration\n");
+		return -EINVAL;
+	}
+
+	for (i = 0; i < num_channels; i++) {
+
+		/* do not initialize channels that are not connected */
+		if (pdata->led_config[i].led_current == 0)
+			continue;
+
+		led_current = pdata->led_config[i].led_current;
+		each = led + i;
+		ret = lp55xx_init_led(each, chip, i);
+		if (ret)
+			goto err_init_led;
+
+		INIT_WORK(&each->brightness_work, cfg->brightness_work_fn);
+
+		chip->num_leds++;
+		each->chip = chip;
+
+		/* setting led current at each channel */
+		if (cfg->set_led_current)
+			cfg->set_led_current(each, led_current);
+	}
+
+	return 0;
+
+err_init_led:
+	lp55xx_unregister_leds(led, chip);
+	return ret;
+}
+EXPORT_SYMBOL_GPL(lp55xx_register_leds);
+
+void lp55xx_unregister_leds(struct lp55xx_led *led, struct lp55xx_chip *chip)
+{
+	int i;
+	struct lp55xx_led *each;
+
+	for (i = 0; i < chip->num_leds; i++) {
+		each = led + i;
+		led_classdev_unregister(&each->cdev);
+		flush_work(&each->brightness_work);
+	}
+}
+EXPORT_SYMBOL_GPL(lp55xx_unregister_leds);
+
+int lp55xx_register_sysfs(struct lp55xx_chip *chip)
+{
+	struct device *dev = &chip->cl->dev;
+	struct lp55xx_device_config *cfg = chip->cfg;
+	int ret;
+
+	if (!cfg->run_engine || !cfg->firmware_cb)
+		goto dev_specific_attrs;
+
+	ret = sysfs_create_group(&dev->kobj, &lp55xx_engine_attr_group);
+	if (ret)
+		return ret;
+
+dev_specific_attrs:
+	return cfg->dev_attr_group ?
+		sysfs_create_group(&dev->kobj, cfg->dev_attr_group) : 0;
+}
+EXPORT_SYMBOL_GPL(lp55xx_register_sysfs);
+
+void lp55xx_unregister_sysfs(struct lp55xx_chip *chip)
+{
+	struct device *dev = &chip->cl->dev;
+	struct lp55xx_device_config *cfg = chip->cfg;
+
+	if (cfg->dev_attr_group)
+		sysfs_remove_group(&dev->kobj, cfg->dev_attr_group);
+
+	sysfs_remove_group(&dev->kobj, &lp55xx_engine_attr_group);
+}
+EXPORT_SYMBOL_GPL(lp55xx_unregister_sysfs);
+
+MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>");
+MODULE_DESCRIPTION("LP55xx Common Driver");
+MODULE_LICENSE("GPL");