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2779f4724b
Simply use device_get_match_data instead of matching against the match table again. Signed-off-by: Marek Behún <marek.behun@nic.cz> Cc: H. Nikolaus Schaller <hns@goldelico.com> Cc: David Rivshin <drivshin@allworx.com> Cc: Sebastian Reichel <sre@kernel.org> Cc: Christian Mauderer <oss@c-mauderer.de> Cc: Andrew Lunn <andrew@lunn.ch> Signed-off-by: Pavel Machek <pavel@ucw.cz>
227 lines
4.9 KiB
C
227 lines
4.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (c) 2017 Sebastian Reichel <sre@kernel.org>
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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 <sre@kernel.org>");
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MODULE_LICENSE("GPL");
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