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 000000000000..d9eb84157423
--- /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");