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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 | // 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"); |