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