[Feature] add GA346 baseline version
Change-Id: Ic62933698569507dcf98240cdf5d9931ae34348f
diff --git a/src/kernel/linux/v4.19/drivers/leds/leds-lt3593.c b/src/kernel/linux/v4.19/drivers/leds/leds-lt3593.c
new file mode 100644
index 0000000..de3623e
--- /dev/null
+++ b/src/kernel/linux/v4.19/drivers/leds/leds-lt3593.c
@@ -0,0 +1,202 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2009,2018 Daniel Mack <daniel@zonque.org>
+
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/leds.h>
+#include <linux/delay.h>
+#include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <uapi/linux/uleds.h>
+
+struct lt3593_led_data {
+ char name[LED_MAX_NAME_SIZE];
+ struct led_classdev cdev;
+ struct gpio_desc *gpiod;
+};
+
+static int lt3593_led_set(struct led_classdev *led_cdev,
+ enum led_brightness value)
+{
+ struct lt3593_led_data *led_dat =
+ container_of(led_cdev, struct lt3593_led_data, cdev);
+ int pulses;
+
+ /*
+ * The LT3593 resets its internal current level register to the maximum
+ * level on the first falling edge on the control pin. Each following
+ * falling edge decreases the current level by 625uA. Up to 32 pulses
+ * can be sent, so the maximum power reduction is 20mA.
+ * After a timeout of 128us, the value is taken from the register and
+ * applied is to the output driver.
+ */
+
+ if (value == 0) {
+ gpiod_set_value_cansleep(led_dat->gpiod, 0);
+ return 0;
+ }
+
+ pulses = 32 - (value * 32) / 255;
+
+ if (pulses == 0) {
+ gpiod_set_value_cansleep(led_dat->gpiod, 0);
+ mdelay(1);
+ gpiod_set_value_cansleep(led_dat->gpiod, 1);
+ return 0;
+ }
+
+ gpiod_set_value_cansleep(led_dat->gpiod, 1);
+
+ while (pulses--) {
+ gpiod_set_value_cansleep(led_dat->gpiod, 0);
+ udelay(1);
+ gpiod_set_value_cansleep(led_dat->gpiod, 1);
+ udelay(1);
+ }
+
+ return 0;
+}
+
+static struct lt3593_led_data *lt3593_led_probe_pdata(struct device *dev)
+{
+ struct gpio_led_platform_data *pdata = dev_get_platdata(dev);
+ const struct gpio_led *template = &pdata->leds[0];
+ struct lt3593_led_data *led_data;
+ int ret, state;
+
+ if (pdata->num_leds != 1)
+ return ERR_PTR(-EINVAL);
+
+ led_data = devm_kzalloc(dev, sizeof(*led_data), GFP_KERNEL);
+ if (!led_data)
+ return ERR_PTR(-ENOMEM);
+
+ led_data->cdev.name = template->name;
+ led_data->cdev.default_trigger = template->default_trigger;
+ led_data->cdev.brightness_set_blocking = lt3593_led_set;
+
+ state = (template->default_state == LEDS_GPIO_DEFSTATE_ON);
+ led_data->cdev.brightness = state ? LED_FULL : LED_OFF;
+
+ if (!template->retain_state_suspended)
+ led_data->cdev.flags |= LED_CORE_SUSPENDRESUME;
+
+ ret = devm_gpio_request_one(dev, template->gpio, state ?
+ GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW,
+ template->name);
+ if (ret < 0)
+ return ERR_PTR(ret);
+
+ led_data->gpiod = gpio_to_desc(template->gpio);
+ if (!led_data->gpiod)
+ return ERR_PTR(-EPROBE_DEFER);
+
+ ret = devm_led_classdev_register(dev, &led_data->cdev);
+ if (ret < 0)
+ return ERR_PTR(ret);
+
+ dev_info(dev, "registered LT3593 LED '%s' at GPIO %d\n",
+ template->name, template->gpio);
+
+ return led_data;
+}
+
+static int lt3593_led_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct lt3593_led_data *led_data;
+ struct fwnode_handle *child;
+ int ret, state = LEDS_GPIO_DEFSTATE_OFF;
+ enum gpiod_flags flags = GPIOD_OUT_LOW;
+ const char *tmp;
+
+ if (dev_get_platdata(dev)) {
+ led_data = lt3593_led_probe_pdata(dev);
+ if (IS_ERR(led_data))
+ return PTR_ERR(led_data);
+
+ goto out;
+ }
+
+ if (!dev->of_node)
+ return -ENODEV;
+
+ led_data = devm_kzalloc(dev, sizeof(*led_data), GFP_KERNEL);
+ if (!led_data)
+ return -ENOMEM;
+
+ if (device_get_child_node_count(dev) != 1) {
+ dev_err(dev, "Device must have exactly one LED sub-node.");
+ return -EINVAL;
+ }
+
+ led_data->gpiod = devm_gpiod_get(dev, "lltc,ctrl", 0);
+ if (IS_ERR(led_data->gpiod))
+ return PTR_ERR(led_data->gpiod);
+
+ child = device_get_next_child_node(dev, NULL);
+
+ ret = fwnode_property_read_string(child, "label", &tmp);
+ if (ret < 0)
+ snprintf(led_data->name, sizeof(led_data->name),
+ "lt3593::");
+ else
+ snprintf(led_data->name, sizeof(led_data->name),
+ "lt3593:%s", tmp);
+
+ fwnode_property_read_string(child, "linux,default-trigger",
+ &led_data->cdev.default_trigger);
+
+ if (!fwnode_property_read_string(child, "default-state", &tmp)) {
+ if (!strcmp(tmp, "keep")) {
+ state = LEDS_GPIO_DEFSTATE_KEEP;
+ flags = GPIOD_ASIS;
+ } else if (!strcmp(tmp, "on")) {
+ state = LEDS_GPIO_DEFSTATE_ON;
+ flags = GPIOD_OUT_HIGH;
+ }
+ }
+
+ led_data->cdev.name = led_data->name;
+ led_data->cdev.brightness_set_blocking = lt3593_led_set;
+ led_data->cdev.brightness = state ? LED_FULL : LED_OFF;
+
+ ret = devm_led_classdev_register(dev, &led_data->cdev);
+ if (ret < 0) {
+ fwnode_handle_put(child);
+ return ret;
+ }
+
+ led_data->cdev.dev->of_node = dev->of_node;
+
+out:
+ platform_set_drvdata(pdev, led_data);
+
+ return 0;
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id of_lt3593_leds_match[] = {
+ { .compatible = "lltc,lt3593", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, of_lt3593_leds_match);
+#endif
+
+static struct platform_driver lt3593_led_driver = {
+ .probe = lt3593_led_probe,
+ .driver = {
+ .name = "leds-lt3593",
+ .of_match_table = of_match_ptr(of_lt3593_leds_match),
+ },
+};
+
+module_platform_driver(lt3593_led_driver);
+
+MODULE_AUTHOR("Daniel Mack <daniel@zonque.org>");
+MODULE_DESCRIPTION("LED driver for LT3593 controllers");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:leds-lt3593");