Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 172 insertions, 0 deletions

diff --git a/drivers/leds/leds-lm36274.c b/drivers/leds/leds-lm36274.c
new file mode 100644
index 0000000000..e009b6d179
--- /dev/null
+++ b/drivers/leds/leds-lm36274.c
@@ -0,0 +1,172 @@
+// SPDX-License-Identifier: GPL-2.0
+// TI LM36274 LED chip family driver
+// Copyright (C) 2019 Texas Instruments Incorporated - https://www.ti.com/
+
+#include <linux/bitops.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/leds.h>
+#include <linux/leds-ti-lmu-common.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/property.h>
+
+#include <linux/mfd/ti-lmu.h>
+#include <linux/mfd/ti-lmu-register.h>
+
+#include <uapi/linux/uleds.h>
+
+#define LM36274_MAX_STRINGS	4
+#define LM36274_BL_EN		BIT(4)
+
+/**
+ * struct lm36274
+ * @pdev: platform device
+ * @led_dev: led class device
+ * @lmu_data: Register and setting values for common code
+ * @regmap: Devices register map
+ * @dev: Pointer to the devices device struct
+ * @led_sources: The LED strings supported in this array
+ * @num_leds: Number of LED strings are supported in this array
+ */
+struct lm36274 {
+	struct platform_device *pdev;
+	struct led_classdev led_dev;
+	struct ti_lmu_bank lmu_data;
+	struct regmap *regmap;
+	struct device *dev;
+
+	u32 led_sources[LM36274_MAX_STRINGS];
+	int num_leds;
+};
+
+static int lm36274_brightness_set(struct led_classdev *led_cdev,
+				  enum led_brightness brt_val)
+{
+	struct lm36274 *chip = container_of(led_cdev, struct lm36274, led_dev);
+
+	return ti_lmu_common_set_brightness(&chip->lmu_data, brt_val);
+}
+
+static int lm36274_init(struct lm36274 *chip)
+{
+	int enable_val = 0;
+	int i;
+
+	for (i = 0; i < chip->num_leds; i++)
+		enable_val |= (1 << chip->led_sources[i]);
+
+	if (!enable_val) {
+		dev_err(chip->dev, "No LEDs were enabled\n");
+		return -EINVAL;
+	}
+
+	enable_val |= LM36274_BL_EN;
+
+	return regmap_write(chip->regmap, LM36274_REG_BL_EN, enable_val);
+}
+
+static int lm36274_parse_dt(struct lm36274 *chip,
+			    struct led_init_data *init_data)
+{
+	struct device *dev = chip->dev;
+	struct fwnode_handle *child;
+	int ret;
+
+	/* There should only be 1 node */
+	if (device_get_child_node_count(dev) != 1)
+		return -EINVAL;
+
+	child = device_get_next_child_node(dev, NULL);
+
+	init_data->fwnode = child;
+	init_data->devicename = chip->pdev->name;
+	/* for backwards compatibility when `label` property is not present */
+	init_data->default_label = ":";
+
+	chip->num_leds = fwnode_property_count_u32(child, "led-sources");
+	if (chip->num_leds <= 0) {
+		ret = -ENODEV;
+		goto err;
+	}
+
+	ret = fwnode_property_read_u32_array(child, "led-sources",
+					     chip->led_sources, chip->num_leds);
+	if (ret) {
+		dev_err(dev, "led-sources property missing\n");
+		goto err;
+	}
+
+	return 0;
+err:
+	fwnode_handle_put(child);
+	return ret;
+}
+
+static int lm36274_probe(struct platform_device *pdev)
+{
+	struct ti_lmu *lmu = dev_get_drvdata(pdev->dev.parent);
+	struct led_init_data init_data = {};
+	struct lm36274 *chip;
+	int ret;
+
+	chip = devm_kzalloc(&pdev->dev, sizeof(*chip), GFP_KERNEL);
+	if (!chip)
+		return -ENOMEM;
+
+	chip->pdev = pdev;
+	chip->dev = &pdev->dev;
+	chip->regmap = lmu->regmap;
+	platform_set_drvdata(pdev, chip);
+
+	ret = lm36274_parse_dt(chip, &init_data);
+	if (ret) {
+		dev_err(chip->dev, "Failed to parse DT node\n");
+		return ret;
+	}
+
+	ret = lm36274_init(chip);
+	if (ret) {
+		fwnode_handle_put(init_data.fwnode);
+		dev_err(chip->dev, "Failed to init the device\n");
+		return ret;
+	}
+
+	chip->lmu_data.regmap = chip->regmap;
+	chip->lmu_data.max_brightness = MAX_BRIGHTNESS_11BIT;
+	chip->lmu_data.msb_brightness_reg = LM36274_REG_BRT_MSB;
+	chip->lmu_data.lsb_brightness_reg = LM36274_REG_BRT_LSB;
+
+	chip->led_dev.max_brightness = MAX_BRIGHTNESS_11BIT;
+	chip->led_dev.brightness_set_blocking = lm36274_brightness_set;
+
+	ret = devm_led_classdev_register_ext(chip->dev, &chip->led_dev,
+					     &init_data);
+	if (ret)
+		dev_err(chip->dev, "Failed to register LED for node %pfw\n",
+			init_data.fwnode);
+
+	fwnode_handle_put(init_data.fwnode);
+
+	return ret;
+}
+
+static const struct of_device_id of_lm36274_leds_match[] = {
+	{ .compatible = "ti,lm36274-backlight", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, of_lm36274_leds_match);
+
+static struct platform_driver lm36274_driver = {
+	.probe  = lm36274_probe,
+	.driver = {
+		.name = "lm36274-leds",
+		.of_match_table = of_lm36274_leds_match,
+	},
+};
+module_platform_driver(lm36274_driver)
+
+MODULE_DESCRIPTION("Texas Instruments LM36274 LED driver");
+MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com>");
+MODULE_LICENSE("GPL v2");