4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 or
6 * later as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
14 #include <linux/leds.h>
15 #include <linux/mfd/motorola-cpcap.h>
16 #include <linux/module.h>
17 #include <linux/mutex.h>
18 #include <linux/of_device.h>
19 #include <linux/platform_device.h>
20 #include <linux/regmap.h>
21 #include <linux/regulator/consumer.h>
23 #define CPCAP_LED_NO_CURRENT 0x0001
25 struct cpcap_led_info {
33 static const struct cpcap_led_info cpcap_led_red = {
34 .reg = CPCAP_REG_REDC,
39 static const struct cpcap_led_info cpcap_led_green = {
40 .reg = CPCAP_REG_GREENC,
45 static const struct cpcap_led_info cpcap_led_blue = {
46 .reg = CPCAP_REG_BLUEC,
51 /* aux display light */
52 static const struct cpcap_led_info cpcap_led_adl = {
53 .reg = CPCAP_REG_ADLC,
60 /* camera privacy led */
61 static const struct cpcap_led_info cpcap_led_cp = {
62 .reg = CPCAP_REG_CLEDC,
70 struct led_classdev led;
71 const struct cpcap_led_info *info;
73 struct regmap *regmap;
74 struct mutex update_lock;
75 struct regulator *vdd;
81 static u16 cpcap_led_val(u8 current_limit, u8 duty_cycle)
83 current_limit &= 0x1f; /* 5 bit */
84 duty_cycle &= 0x0f; /* 4 bit */
86 return current_limit << 4 | duty_cycle;
89 static int cpcap_led_set_power(struct cpcap_led *led, bool status)
93 if (status == led->powered)
97 err = regulator_enable(led->vdd);
99 err = regulator_disable(led->vdd);
102 dev_err(led->dev, "regulator failure: %d", err);
106 led->powered = status;
111 static int cpcap_led_set(struct led_classdev *ledc, enum led_brightness value)
113 struct cpcap_led *led = container_of(ledc, struct cpcap_led, led);
117 mutex_lock(&led->update_lock);
119 if (value > LED_OFF) {
120 err = cpcap_led_set_power(led, true);
125 if (value == LED_OFF) {
126 /* Avoid HW issue by turning off current before duty cycle */
127 err = regmap_update_bits(led->regmap,
128 led->info->reg, led->info->mask, CPCAP_LED_NO_CURRENT);
130 dev_err(led->dev, "regmap failed: %d", err);
134 brightness = cpcap_led_val(value, LED_OFF);
136 brightness = cpcap_led_val(value, LED_ON);
139 err = regmap_update_bits(led->regmap, led->info->reg, led->info->mask,
142 dev_err(led->dev, "regmap failed: %d", err);
146 if (value == LED_OFF) {
147 err = cpcap_led_set_power(led, false);
153 mutex_unlock(&led->update_lock);
157 static const struct of_device_id cpcap_led_of_match[] = {
158 { .compatible = "motorola,cpcap-led-red", .data = &cpcap_led_red },
159 { .compatible = "motorola,cpcap-led-green", .data = &cpcap_led_green },
160 { .compatible = "motorola,cpcap-led-blue", .data = &cpcap_led_blue },
161 { .compatible = "motorola,cpcap-led-adl", .data = &cpcap_led_adl },
162 { .compatible = "motorola,cpcap-led-cp", .data = &cpcap_led_cp },
165 MODULE_DEVICE_TABLE(of, cpcap_led_of_match);
167 static int cpcap_led_probe(struct platform_device *pdev)
169 const struct of_device_id *match;
170 struct cpcap_led *led;
173 match = of_match_device(of_match_ptr(cpcap_led_of_match), &pdev->dev);
174 if (!match || !match->data)
177 led = devm_kzalloc(&pdev->dev, sizeof(*led), GFP_KERNEL);
180 platform_set_drvdata(pdev, led);
181 led->info = match->data;
182 led->dev = &pdev->dev;
184 if (led->info->reg == 0x0000) {
185 dev_err(led->dev, "Unsupported LED");
189 led->regmap = dev_get_regmap(pdev->dev.parent, NULL);
193 led->vdd = devm_regulator_get(&pdev->dev, "vdd");
194 if (IS_ERR(led->vdd)) {
195 err = PTR_ERR(led->vdd);
196 dev_err(led->dev, "Couldn't get regulator: %d", err);
200 err = device_property_read_string(&pdev->dev, "label", &led->led.name);
202 dev_err(led->dev, "Couldn't read LED label: %d", err);
206 if (led->info->init_mask) {
207 err = regmap_update_bits(led->regmap, led->info->reg,
208 led->info->init_mask, led->info->init_val);
210 dev_err(led->dev, "regmap failed: %d", err);
215 mutex_init(&led->update_lock);
217 led->led.max_brightness = led->info->limit;
218 led->led.brightness_set_blocking = cpcap_led_set;
219 err = devm_led_classdev_register(&pdev->dev, &led->led);
221 dev_err(led->dev, "Couldn't register LED: %d", err);
228 static struct platform_driver cpcap_led_driver = {
229 .probe = cpcap_led_probe,
232 .of_match_table = cpcap_led_of_match,
235 module_platform_driver(cpcap_led_driver);
237 MODULE_DESCRIPTION("CPCAP LED driver");
239 MODULE_LICENSE("GPL");