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710 lines
16 KiB
710 lines
16 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* LP5521/LP5523/LP55231/LP5562 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 <[email protected]> |
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* |
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* Derived from leds-lp5521.c, leds-lp5523.c |
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*/ |
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|
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#include <linux/clk.h> |
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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 <linux/slab.h> |
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#include <linux/gpio/consumer.h> |
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#include "leds-lp55xx-common.h" |
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/* External clock rate */ |
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#define LP55XX_CLK_32K 32768 |
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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 struct lp55xx_led *mcled_cdev_to_led(struct led_classdev_mc *mc_cdev) |
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{ |
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return container_of(mc_cdev, struct lp55xx_led, mc_cdev); |
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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 led_current_show(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 scnprintf(buf, PAGE_SIZE, "%d\n", led->led_current); |
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} |
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static ssize_t led_current_store(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 max_current_show(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 scnprintf(buf, PAGE_SIZE, "%d\n", led->max_current); |
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} |
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static DEVICE_ATTR_RW(led_current); |
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static DEVICE_ATTR_RO(max_current); |
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static struct attribute *lp55xx_led_attrs[] = { |
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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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ATTRIBUTE_GROUPS(lp55xx_led); |
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static int lp55xx_set_mc_brightness(struct led_classdev *cdev, |
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enum led_brightness brightness) |
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{ |
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struct led_classdev_mc *mc_dev = lcdev_to_mccdev(cdev); |
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struct lp55xx_led *led = mcled_cdev_to_led(mc_dev); |
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struct lp55xx_device_config *cfg = led->chip->cfg; |
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led_mc_calc_color_components(&led->mc_cdev, brightness); |
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return cfg->multicolor_brightness_fn(led); |
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} |
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static int 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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struct lp55xx_device_config *cfg = led->chip->cfg; |
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led->brightness = (u8)brightness; |
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return cfg->brightness_fn(led); |
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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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int max_channel = cfg->max_channel; |
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struct mc_subled *mc_led_info; |
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struct led_classdev *led_cdev; |
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char name[32]; |
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int i, j = 0; |
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int ret; |
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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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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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if (pdata->led_config[chan].num_colors > 1) { |
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mc_led_info = devm_kcalloc(dev, |
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pdata->led_config[chan].num_colors, |
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sizeof(*mc_led_info), GFP_KERNEL); |
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if (!mc_led_info) |
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return -ENOMEM; |
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led_cdev = &led->mc_cdev.led_cdev; |
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led_cdev->name = led->cdev.name; |
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led_cdev->brightness_set_blocking = lp55xx_set_mc_brightness; |
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led->mc_cdev.num_colors = pdata->led_config[chan].num_colors; |
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for (i = 0; i < led->mc_cdev.num_colors; i++) { |
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mc_led_info[i].color_index = |
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pdata->led_config[chan].color_id[i]; |
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mc_led_info[i].channel = |
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pdata->led_config[chan].output_num[i]; |
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j++; |
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} |
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led->mc_cdev.subled_info = mc_led_info; |
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} else { |
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led->cdev.brightness_set_blocking = lp55xx_set_brightness; |
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} |
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led->cdev.groups = lp55xx_led_groups; |
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led->cdev.default_trigger = pdata->led_config[chan].default_trigger; |
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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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if (pdata->led_config[chan].num_colors > 1) |
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ret = devm_led_classdev_multicolor_register(dev, &led->mc_cdev); |
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else |
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ret = devm_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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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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enum lp55xx_engine_index idx = chip->engine_idx; |
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if (!fw) { |
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dev_err(dev, "firmware request failed\n"); |
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return; |
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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->engines[idx - 1].mode = LP55XX_ENGINE_LOAD; |
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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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/* firmware should be released for other channel use */ |
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release_firmware(chip->fw); |
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chip->fw = NULL; |
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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, false, name, dev, |
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GFP_KERNEL, chip, lp55xx_firmware_loaded); |
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} |
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static ssize_t select_engine_show(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 select_engine_store(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 run_engine_store(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_RW(select_engine); |
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static DEVICE_ATTR_WO(run_engine); |
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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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bool lp55xx_is_extclk_used(struct lp55xx_chip *chip) |
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{ |
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struct clk *clk; |
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int err; |
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clk = devm_clk_get(&chip->cl->dev, "32k_clk"); |
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if (IS_ERR(clk)) |
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goto use_internal_clk; |
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err = clk_prepare_enable(clk); |
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if (err) |
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goto use_internal_clk; |
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if (clk_get_rate(clk) != LP55XX_CLK_32K) { |
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clk_disable_unprepare(clk); |
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goto use_internal_clk; |
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} |
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dev_info(&chip->cl->dev, "%dHz external clock used\n", LP55XX_CLK_32K); |
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chip->clk = clk; |
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return true; |
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use_internal_clk: |
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dev_info(&chip->cl->dev, "internal clock used\n"); |
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return false; |
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} |
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EXPORT_SYMBOL_GPL(lp55xx_is_extclk_used); |
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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->enable_gpiod) { |
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gpiod_set_consumer_name(pdata->enable_gpiod, "LP55xx enable"); |
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gpiod_set_value(pdata->enable_gpiod, 0); |
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usleep_range(1000, 2000); /* Keep enable down at least 1ms */ |
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gpiod_set_value(pdata->enable_gpiod, 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 (chip->clk) |
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clk_disable_unprepare(chip->clk); |
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if (pdata->enable_gpiod) |
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gpiod_set_value(pdata->enable_gpiod, 0); |
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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_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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|
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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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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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return ret; |
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} |
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EXPORT_SYMBOL_GPL(lp55xx_register_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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static int lp55xx_parse_common_child(struct device_node *np, |
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struct lp55xx_led_config *cfg, |
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int led_number, int *chan_nr) |
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{ |
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int ret; |
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of_property_read_string(np, "chan-name", |
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&cfg[led_number].name); |
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of_property_read_u8(np, "led-cur", |
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&cfg[led_number].led_current); |
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of_property_read_u8(np, "max-cur", |
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&cfg[led_number].max_current); |
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|
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ret = of_property_read_u32(np, "reg", chan_nr); |
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if (ret) |
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return ret; |
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|
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if (*chan_nr < 0 || *chan_nr > cfg->max_channel) |
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return -EINVAL; |
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|
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return 0; |
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} |
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|
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static int lp55xx_parse_multi_led_child(struct device_node *child, |
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struct lp55xx_led_config *cfg, |
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int child_number, int color_number) |
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{ |
|
int chan_nr, color_id, ret; |
|
|
|
ret = lp55xx_parse_common_child(child, cfg, child_number, &chan_nr); |
|
if (ret) |
|
return ret; |
|
|
|
ret = of_property_read_u32(child, "color", &color_id); |
|
if (ret) |
|
return ret; |
|
|
|
cfg[child_number].color_id[color_number] = color_id; |
|
cfg[child_number].output_num[color_number] = chan_nr; |
|
|
|
return 0; |
|
} |
|
|
|
static int lp55xx_parse_multi_led(struct device_node *np, |
|
struct lp55xx_led_config *cfg, |
|
int child_number) |
|
{ |
|
struct device_node *child; |
|
int num_colors = 0, ret; |
|
|
|
for_each_available_child_of_node(np, child) { |
|
ret = lp55xx_parse_multi_led_child(child, cfg, child_number, |
|
num_colors); |
|
if (ret) { |
|
of_node_put(child); |
|
return ret; |
|
} |
|
num_colors++; |
|
} |
|
|
|
cfg[child_number].num_colors = num_colors; |
|
|
|
return 0; |
|
} |
|
|
|
static int lp55xx_parse_logical_led(struct device_node *np, |
|
struct lp55xx_led_config *cfg, |
|
int child_number) |
|
{ |
|
int led_color, ret; |
|
int chan_nr = 0; |
|
|
|
cfg[child_number].default_trigger = |
|
of_get_property(np, "linux,default-trigger", NULL); |
|
|
|
ret = of_property_read_u32(np, "color", &led_color); |
|
if (ret) |
|
return ret; |
|
|
|
if (led_color == LED_COLOR_ID_RGB) |
|
return lp55xx_parse_multi_led(np, cfg, child_number); |
|
|
|
ret = lp55xx_parse_common_child(np, cfg, child_number, &chan_nr); |
|
if (ret < 0) |
|
return ret; |
|
|
|
cfg[child_number].chan_nr = chan_nr; |
|
|
|
return ret; |
|
} |
|
|
|
struct lp55xx_platform_data *lp55xx_of_populate_pdata(struct device *dev, |
|
struct device_node *np, |
|
struct lp55xx_chip *chip) |
|
{ |
|
struct device_node *child; |
|
struct lp55xx_platform_data *pdata; |
|
struct lp55xx_led_config *cfg; |
|
int num_channels; |
|
int i = 0; |
|
int ret; |
|
|
|
pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); |
|
if (!pdata) |
|
return ERR_PTR(-ENOMEM); |
|
|
|
num_channels = of_get_available_child_count(np); |
|
if (num_channels == 0) { |
|
dev_err(dev, "no LED channels\n"); |
|
return ERR_PTR(-EINVAL); |
|
} |
|
|
|
cfg = devm_kcalloc(dev, num_channels, sizeof(*cfg), GFP_KERNEL); |
|
if (!cfg) |
|
return ERR_PTR(-ENOMEM); |
|
|
|
pdata->led_config = &cfg[0]; |
|
pdata->num_channels = num_channels; |
|
cfg->max_channel = chip->cfg->max_channel; |
|
|
|
for_each_available_child_of_node(np, child) { |
|
ret = lp55xx_parse_logical_led(child, cfg, i); |
|
if (ret) { |
|
of_node_put(child); |
|
return ERR_PTR(-EINVAL); |
|
} |
|
i++; |
|
} |
|
|
|
of_property_read_string(np, "label", &pdata->label); |
|
of_property_read_u8(np, "clock-mode", &pdata->clock_mode); |
|
|
|
pdata->enable_gpiod = devm_gpiod_get_optional(dev, "enable", |
|
GPIOD_ASIS); |
|
if (IS_ERR(pdata->enable_gpiod)) |
|
return ERR_CAST(pdata->enable_gpiod); |
|
|
|
/* LP8501 specific */ |
|
of_property_read_u8(np, "pwr-sel", (u8 *)&pdata->pwr_sel); |
|
|
|
return pdata; |
|
} |
|
EXPORT_SYMBOL_GPL(lp55xx_of_populate_pdata); |
|
|
|
MODULE_AUTHOR("Milo Kim <[email protected]>"); |
|
MODULE_DESCRIPTION("LP55xx Common Driver"); |
|
MODULE_LICENSE("GPL");
|
|
|