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226 lines
4.9 KiB
226 lines
4.9 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Copyright (c) 2017 Sebastian Reichel <[email protected]> |
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*/ |
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#include <linux/leds.h> |
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#include <linux/mfd/motorola-cpcap.h> |
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#include <linux/module.h> |
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#include <linux/mutex.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/regmap.h> |
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#include <linux/regulator/consumer.h> |
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#define CPCAP_LED_NO_CURRENT 0x0001 |
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struct cpcap_led_info { |
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u16 reg; |
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u16 mask; |
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u16 limit; |
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u16 init_mask; |
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u16 init_val; |
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}; |
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static const struct cpcap_led_info cpcap_led_red = { |
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.reg = CPCAP_REG_REDC, |
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.mask = 0x03FF, |
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.limit = 31, |
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}; |
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static const struct cpcap_led_info cpcap_led_green = { |
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.reg = CPCAP_REG_GREENC, |
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.mask = 0x03FF, |
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.limit = 31, |
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}; |
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static const struct cpcap_led_info cpcap_led_blue = { |
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.reg = CPCAP_REG_BLUEC, |
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.mask = 0x03FF, |
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.limit = 31, |
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}; |
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/* aux display light */ |
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static const struct cpcap_led_info cpcap_led_adl = { |
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.reg = CPCAP_REG_ADLC, |
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.mask = 0x000F, |
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.limit = 1, |
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.init_mask = 0x7FFF, |
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.init_val = 0x5FF0, |
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}; |
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/* camera privacy led */ |
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static const struct cpcap_led_info cpcap_led_cp = { |
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.reg = CPCAP_REG_CLEDC, |
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.mask = 0x0007, |
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.limit = 1, |
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.init_mask = 0x03FF, |
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.init_val = 0x0008, |
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}; |
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struct cpcap_led { |
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struct led_classdev led; |
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const struct cpcap_led_info *info; |
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struct device *dev; |
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struct regmap *regmap; |
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struct mutex update_lock; |
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struct regulator *vdd; |
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bool powered; |
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u32 current_limit; |
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}; |
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static u16 cpcap_led_val(u8 current_limit, u8 duty_cycle) |
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{ |
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current_limit &= 0x1f; /* 5 bit */ |
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duty_cycle &= 0x0f; /* 4 bit */ |
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return current_limit << 4 | duty_cycle; |
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} |
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static int cpcap_led_set_power(struct cpcap_led *led, bool status) |
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{ |
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int err; |
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if (status == led->powered) |
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return 0; |
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if (status) |
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err = regulator_enable(led->vdd); |
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else |
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err = regulator_disable(led->vdd); |
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if (err) { |
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dev_err(led->dev, "regulator failure: %d", err); |
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return err; |
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} |
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led->powered = status; |
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return 0; |
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} |
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static int cpcap_led_set(struct led_classdev *ledc, enum led_brightness value) |
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{ |
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struct cpcap_led *led = container_of(ledc, struct cpcap_led, led); |
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int brightness; |
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int err; |
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mutex_lock(&led->update_lock); |
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if (value > LED_OFF) { |
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err = cpcap_led_set_power(led, true); |
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if (err) |
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goto exit; |
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} |
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if (value == LED_OFF) { |
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/* Avoid HW issue by turning off current before duty cycle */ |
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err = regmap_update_bits(led->regmap, |
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led->info->reg, led->info->mask, CPCAP_LED_NO_CURRENT); |
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if (err) { |
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dev_err(led->dev, "regmap failed: %d", err); |
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goto exit; |
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} |
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brightness = cpcap_led_val(value, LED_OFF); |
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} else { |
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brightness = cpcap_led_val(value, LED_ON); |
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} |
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err = regmap_update_bits(led->regmap, led->info->reg, led->info->mask, |
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brightness); |
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if (err) { |
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dev_err(led->dev, "regmap failed: %d", err); |
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goto exit; |
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} |
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if (value == LED_OFF) { |
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err = cpcap_led_set_power(led, false); |
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if (err) |
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goto exit; |
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} |
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exit: |
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mutex_unlock(&led->update_lock); |
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return err; |
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} |
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static const struct of_device_id cpcap_led_of_match[] = { |
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{ .compatible = "motorola,cpcap-led-red", .data = &cpcap_led_red }, |
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{ .compatible = "motorola,cpcap-led-green", .data = &cpcap_led_green }, |
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{ .compatible = "motorola,cpcap-led-blue", .data = &cpcap_led_blue }, |
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{ .compatible = "motorola,cpcap-led-adl", .data = &cpcap_led_adl }, |
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{ .compatible = "motorola,cpcap-led-cp", .data = &cpcap_led_cp }, |
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{}, |
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}; |
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MODULE_DEVICE_TABLE(of, cpcap_led_of_match); |
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static int cpcap_led_probe(struct platform_device *pdev) |
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{ |
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struct cpcap_led *led; |
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int err; |
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led = devm_kzalloc(&pdev->dev, sizeof(*led), GFP_KERNEL); |
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if (!led) |
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return -ENOMEM; |
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platform_set_drvdata(pdev, led); |
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led->info = device_get_match_data(&pdev->dev); |
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led->dev = &pdev->dev; |
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if (led->info->reg == 0x0000) { |
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dev_err(led->dev, "Unsupported LED"); |
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return -ENODEV; |
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} |
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led->regmap = dev_get_regmap(pdev->dev.parent, NULL); |
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if (!led->regmap) |
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return -ENODEV; |
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led->vdd = devm_regulator_get(&pdev->dev, "vdd"); |
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if (IS_ERR(led->vdd)) { |
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err = PTR_ERR(led->vdd); |
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dev_err(led->dev, "Couldn't get regulator: %d", err); |
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return err; |
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} |
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err = device_property_read_string(&pdev->dev, "label", &led->led.name); |
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if (err) { |
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dev_err(led->dev, "Couldn't read LED label: %d", err); |
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return err; |
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} |
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if (led->info->init_mask) { |
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err = regmap_update_bits(led->regmap, led->info->reg, |
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led->info->init_mask, led->info->init_val); |
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if (err) { |
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dev_err(led->dev, "regmap failed: %d", err); |
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return err; |
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} |
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} |
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mutex_init(&led->update_lock); |
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led->led.max_brightness = led->info->limit; |
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led->led.brightness_set_blocking = cpcap_led_set; |
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err = devm_led_classdev_register(&pdev->dev, &led->led); |
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if (err) { |
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dev_err(led->dev, "Couldn't register LED: %d", err); |
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return err; |
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} |
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return 0; |
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} |
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static struct platform_driver cpcap_led_driver = { |
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.probe = cpcap_led_probe, |
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.driver = { |
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.name = "cpcap-led", |
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.of_match_table = cpcap_led_of_match, |
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}, |
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}; |
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module_platform_driver(cpcap_led_driver); |
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MODULE_DESCRIPTION("CPCAP LED driver"); |
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MODULE_AUTHOR("Sebastian Reichel <[email protected]>"); |
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MODULE_LICENSE("GPL");
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