325 lines
8.5 KiB
C
325 lines
8.5 KiB
C
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/* Copyright (c) 2013-2014, The Linux Foundation. All rights reserved.
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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 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/leds.h>
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#include <linux/platform_device.h>
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#include <linux/of_gpio.h>
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#include <linux/gpio.h>
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#include <linux/of.h>
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#include <linux/printk.h>
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#include <linux/list.h>
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#include <linux/pinctrl/consumer.h>
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/* #define CONFIG_GPIO_FLASH_DEBUG */
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#undef CDBG
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#ifdef CONFIG_GPIO_FLASH_DEBUG
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#define CDBG(fmt, args...) pr_err(fmt, ##args)
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#else
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#define CDBG(fmt, args...) do { } while (0)
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#endif
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#define LED_GPIO_FLASH_DRIVER_NAME "qcom,leds-gpio-flash"
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#define LED_TRIGGER_DEFAULT "none"
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#define GPIO_OUT_LOW (0 << 1)
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#define GPIO_OUT_HIGH (1 << 1)
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enum msm_flash_seq_type_t {
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FLASH_EN,
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FLASH_NOW,
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};
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struct msm_flash_ctrl_seq {
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enum msm_flash_seq_type_t seq_type;
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uint8_t flash_on_val;
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uint8_t torch_on_val;
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uint8_t flash_off_val;
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};
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struct led_gpio_flash_data {
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int flash_en;
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int flash_now;
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int brightness;
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struct led_classdev cdev;
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struct pinctrl *pinctrl;
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struct pinctrl_state *gpio_state_default;
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struct msm_flash_ctrl_seq ctrl_seq[2];
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};
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static struct of_device_id led_gpio_flash_of_match[] = {
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{.compatible = LED_GPIO_FLASH_DRIVER_NAME,},
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{},
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};
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static void led_gpio_brightness_set(struct led_classdev *led_cdev,
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enum led_brightness value)
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{
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int rc = 0;
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struct led_gpio_flash_data *flash_led =
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container_of(led_cdev, struct led_gpio_flash_data, cdev);
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int brightness = value;
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int flash_en = 0, flash_now = 0;
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if (brightness > LED_HALF) {
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flash_en =
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flash_led->ctrl_seq[FLASH_EN].flash_on_val;
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flash_now =
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flash_led->ctrl_seq[FLASH_NOW].flash_on_val;
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} else if (brightness > LED_OFF) {
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flash_en =
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flash_led->ctrl_seq[FLASH_EN].torch_on_val;
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flash_now =
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flash_led->ctrl_seq[FLASH_NOW].torch_on_val;
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} else {
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flash_en = 0;
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flash_now = 0;
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}
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CDBG("%s:flash_en=%d, flash_now=%d\n", __func__, flash_en, flash_now);
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rc = gpio_direction_output(flash_led->flash_en, flash_en);
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if (rc) {
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pr_err("%s: Failed to set gpio %d\n", __func__,
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flash_led->flash_en);
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goto err;
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}
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rc = gpio_direction_output(flash_led->flash_now, flash_now);
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if (rc) {
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pr_err("%s: Failed to set gpio %d\n", __func__,
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flash_led->flash_now);
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goto err;
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}
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flash_led->brightness = brightness;
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err:
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return;
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}
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static enum led_brightness led_gpio_brightness_get(struct led_classdev
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*led_cdev)
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{
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struct led_gpio_flash_data *flash_led =
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container_of(led_cdev, struct led_gpio_flash_data, cdev);
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return flash_led->brightness;
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}
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int led_gpio_flash_probe(struct platform_device *pdev)
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{
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int rc = 0;
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const char *temp_str;
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struct led_gpio_flash_data *flash_led = NULL;
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struct device_node *node = pdev->dev.of_node;
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const char *seq_name = NULL;
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uint32_t array_flash_seq[2];
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uint32_t array_torch_seq[2];
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int i = 0;
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flash_led = devm_kzalloc(&pdev->dev, sizeof(struct led_gpio_flash_data),
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GFP_KERNEL);
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if (flash_led == NULL) {
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dev_err(&pdev->dev, "%s:%d Unable to allocate memory\n",
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__func__, __LINE__);
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return -ENOMEM;
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}
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flash_led->cdev.default_trigger = LED_TRIGGER_DEFAULT;
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rc = of_property_read_string(node, "linux,default-trigger", &temp_str);
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if (!rc)
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flash_led->cdev.default_trigger = temp_str;
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flash_led->pinctrl = devm_pinctrl_get(&pdev->dev);
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if (IS_ERR(flash_led->pinctrl)) {
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pr_err("%s:failed to get pinctrl\n", __func__);
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return PTR_ERR(flash_led->pinctrl);
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}
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flash_led->gpio_state_default = pinctrl_lookup_state(flash_led->pinctrl,
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"flash_default");
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if (IS_ERR(flash_led->gpio_state_default)) {
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pr_err("%s:can not get active pinstate\n", __func__);
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return -EINVAL;
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}
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rc = pinctrl_select_state(flash_led->pinctrl,
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flash_led->gpio_state_default);
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if (rc)
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pr_err("%s:set state failed!\n", __func__);
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flash_led->flash_en = of_get_named_gpio(node, "qcom,flash-en", 0);
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if (flash_led->flash_en < 0) {
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dev_err(&pdev->dev,
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"Looking up %s property in node %s failed. rc = %d\n",
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"flash-en", node->full_name, flash_led->flash_en);
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goto error;
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} else {
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rc = gpio_request(flash_led->flash_en, "FLASH_EN");
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if (rc) {
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dev_err(&pdev->dev,
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"%s: Failed to request gpio %d,rc = %d\n",
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__func__, flash_led->flash_en, rc);
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goto error;
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}
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}
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flash_led->flash_now = of_get_named_gpio(node, "qcom,flash-now", 0);
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if (flash_led->flash_now < 0) {
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dev_err(&pdev->dev,
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"Looking up %s property in node %s failed. rc = %d\n",
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"flash-now", node->full_name, flash_led->flash_now);
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goto error;
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} else {
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rc = gpio_request(flash_led->flash_now, "FLASH_NOW");
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if (rc) {
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dev_err(&pdev->dev,
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"%s: Failed to request gpio %d,rc = %d\n",
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__func__, flash_led->flash_now, rc);
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goto error;
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}
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}
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rc = of_property_read_string(node, "linux,name", &flash_led->cdev.name);
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if (rc) {
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dev_err(&pdev->dev, "%s: Failed to read linux name. rc = %d\n",
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__func__, rc);
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goto error;
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}
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rc = of_property_read_u32_array(node, "qcom,flash-seq-val",
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array_flash_seq, 2);
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if (rc < 0) {
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pr_err("%s get flash op seq failed %d\n",
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__func__, __LINE__);
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goto error;
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}
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rc = of_property_read_u32_array(node, "qcom,torch-seq-val",
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array_torch_seq, 2);
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if (rc < 0) {
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pr_err("%s get torch op seq failed %d\n",
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__func__, __LINE__);
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goto error;
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}
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for (i = 0; i < 2; i++) {
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rc = of_property_read_string_index(node,
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"qcom,op-seq", i,
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&seq_name);
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CDBG("%s seq_name[%d] = %s\n", __func__, i,
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seq_name);
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if (rc < 0)
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dev_err(&pdev->dev, "%s failed %d\n",
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__func__, __LINE__);
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if (!strcmp(seq_name, "flash_en")) {
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flash_led->ctrl_seq[FLASH_EN].seq_type =
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FLASH_EN;
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CDBG("%s:%d seq_type[%d] %d\n", __func__, __LINE__,
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i, flash_led->ctrl_seq[FLASH_EN].seq_type);
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if (array_flash_seq[i] == 0)
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flash_led->ctrl_seq[FLASH_EN].flash_on_val =
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GPIO_OUT_LOW;
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else
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flash_led->ctrl_seq[FLASH_EN].flash_on_val =
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GPIO_OUT_HIGH;
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if (array_torch_seq[i] == 0)
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flash_led->ctrl_seq[FLASH_EN].torch_on_val =
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GPIO_OUT_LOW;
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else
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flash_led->ctrl_seq[FLASH_EN].torch_on_val =
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GPIO_OUT_HIGH;
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} else if (!strcmp(seq_name, "flash_now")) {
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flash_led->ctrl_seq[FLASH_NOW].seq_type =
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FLASH_NOW;
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CDBG("%s:%d seq_type[%d] %d\n", __func__, __LINE__,
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i, flash_led->ctrl_seq[i].seq_type);
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if (array_flash_seq[i] == 0)
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flash_led->ctrl_seq[FLASH_NOW].flash_on_val =
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GPIO_OUT_LOW;
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else
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flash_led->ctrl_seq[FLASH_NOW].flash_on_val =
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GPIO_OUT_HIGH;
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if (array_torch_seq[i] == 0)
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flash_led->ctrl_seq[FLASH_NOW].torch_on_val =
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GPIO_OUT_LOW;
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else
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flash_led->ctrl_seq[FLASH_NOW].torch_on_val =
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GPIO_OUT_HIGH;
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}
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}
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platform_set_drvdata(pdev, flash_led);
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flash_led->cdev.max_brightness = LED_FULL;
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flash_led->cdev.brightness_set = led_gpio_brightness_set;
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flash_led->cdev.brightness_get = led_gpio_brightness_get;
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rc = led_classdev_register(&pdev->dev, &flash_led->cdev);
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if (rc) {
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dev_err(&pdev->dev, "%s: Failed to register led dev. rc = %d\n",
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__func__, rc);
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goto error;
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}
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pr_err("%s:probe successfully!\n", __func__);
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return 0;
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error:
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if (IS_ERR(flash_led->pinctrl))
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devm_pinctrl_put(flash_led->pinctrl);
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devm_kfree(&pdev->dev, flash_led);
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return rc;
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}
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int led_gpio_flash_remove(struct platform_device *pdev)
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{
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struct led_gpio_flash_data *flash_led =
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(struct led_gpio_flash_data *)platform_get_drvdata(pdev);
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if (IS_ERR(flash_led->pinctrl))
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devm_pinctrl_put(flash_led->pinctrl);
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led_classdev_unregister(&flash_led->cdev);
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devm_kfree(&pdev->dev, flash_led);
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return 0;
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}
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static struct platform_driver led_gpio_flash_driver = {
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.probe = led_gpio_flash_probe,
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.remove = led_gpio_flash_remove,
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.driver = {
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.name = LED_GPIO_FLASH_DRIVER_NAME,
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.owner = THIS_MODULE,
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.of_match_table = led_gpio_flash_of_match,
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}
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};
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static int __init led_gpio_flash_init(void)
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{
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return platform_driver_register(&led_gpio_flash_driver);
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}
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static void __exit led_gpio_flash_exit(void)
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{
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return platform_driver_unregister(&led_gpio_flash_driver);
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}
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late_initcall(led_gpio_flash_init);
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module_exit(led_gpio_flash_exit);
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MODULE_DESCRIPTION("QCOM GPIO LEDs driver");
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS("leds:leds-msm-gpio-flash");
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