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