^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) // TI LM36274 LED chip family driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) // Copyright (C) 2019 Texas Instruments Incorporated - https://www.ti.com/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) #include <linux/bitops.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) #include <linux/device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #include <linux/err.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/leds.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/leds-ti-lmu-common.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/of_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/mfd/ti-lmu.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/mfd/ti-lmu-register.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <uapi/linux/uleds.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #define LM36274_MAX_STRINGS 4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #define LM36274_BL_EN BIT(4)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) * struct lm36274
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) * @pdev: platform device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) * @led_dev: led class device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) * @lmu_data: Register and setting values for common code
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) * @regmap: Devices register map
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) * @dev: Pointer to the devices device struct
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) * @led_sources: The LED strings supported in this array
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) * @num_leds: Number of LED strings are supported in this array
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) struct lm36274 {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) struct platform_device *pdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) struct led_classdev led_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) struct ti_lmu_bank lmu_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) struct regmap *regmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) struct device *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) u32 led_sources[LM36274_MAX_STRINGS];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) int num_leds;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) static int lm36274_brightness_set(struct led_classdev *led_cdev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) enum led_brightness brt_val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) struct lm36274 *chip = container_of(led_cdev, struct lm36274, led_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) return ti_lmu_common_set_brightness(&chip->lmu_data, brt_val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) static int lm36274_init(struct lm36274 *chip)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) int enable_val = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) for (i = 0; i < chip->num_leds; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) enable_val |= (1 << chip->led_sources[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) if (!enable_val) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) dev_err(chip->dev, "No LEDs were enabled\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) enable_val |= LM36274_BL_EN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) return regmap_write(chip->regmap, LM36274_REG_BL_EN, enable_val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) static int lm36274_parse_dt(struct lm36274 *chip,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) struct led_init_data *init_data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) struct device *dev = chip->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) struct fwnode_handle *child;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) /* There should only be 1 node */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) if (device_get_child_node_count(dev) != 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) child = device_get_next_child_node(dev, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) init_data->fwnode = child;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) init_data->devicename = chip->pdev->name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) /* for backwards compatibility when `label` property is not present */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) init_data->default_label = ":";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) chip->num_leds = fwnode_property_count_u32(child, "led-sources");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) if (chip->num_leds <= 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) ret = -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) ret = fwnode_property_read_u32_array(child, "led-sources",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) chip->led_sources, chip->num_leds);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) dev_err(dev, "led-sources property missing\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) err:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) fwnode_handle_put(child);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) static int lm36274_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) struct ti_lmu *lmu = dev_get_drvdata(pdev->dev.parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) struct led_init_data init_data = {};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) struct lm36274 *chip;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) chip = devm_kzalloc(&pdev->dev, sizeof(*chip), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) if (!chip)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) chip->pdev = pdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) chip->dev = &pdev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) chip->regmap = lmu->regmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) platform_set_drvdata(pdev, chip);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) ret = lm36274_parse_dt(chip, &init_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) dev_err(chip->dev, "Failed to parse DT node\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) ret = lm36274_init(chip);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) fwnode_handle_put(init_data.fwnode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) dev_err(chip->dev, "Failed to init the device\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) chip->lmu_data.regmap = chip->regmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) chip->lmu_data.max_brightness = MAX_BRIGHTNESS_11BIT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) chip->lmu_data.msb_brightness_reg = LM36274_REG_BRT_MSB;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) chip->lmu_data.lsb_brightness_reg = LM36274_REG_BRT_LSB;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) chip->led_dev.max_brightness = MAX_BRIGHTNESS_11BIT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) chip->led_dev.brightness_set_blocking = lm36274_brightness_set;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) ret = devm_led_classdev_register_ext(chip->dev, &chip->led_dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) &init_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) dev_err(chip->dev, "Failed to register LED for node %pfw\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) init_data.fwnode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) fwnode_handle_put(init_data.fwnode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) static const struct of_device_id of_lm36274_leds_match[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) { .compatible = "ti,lm36274-backlight", },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) {},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) MODULE_DEVICE_TABLE(of, of_lm36274_leds_match);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) static struct platform_driver lm36274_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) .probe = lm36274_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) .name = "lm36274-leds",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) .of_match_table = of_lm36274_leds_match,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) module_platform_driver(lm36274_driver)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) MODULE_DESCRIPTION("Texas Instruments LM36274 LED driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) MODULE_LICENSE("GPL v2");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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