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