1 // SPDX-License-Identifier: GPL-2.0-only
2 /* Copyright (c) 2010, 2011, 2016 The Linux Foundation. All rights reserved.
4 #include <linux/leds.h>
5 #include <linux/module.h>
7 #include <linux/of_device.h>
8 #include <linux/platform_device.h>
10 #include <linux/regmap.h>
12 #define PM8058_LED_TYPE_COMMON 0x00
13 #define PM8058_LED_TYPE_KEYPAD 0x01
14 #define PM8058_LED_TYPE_FLASH 0x02
16 #define PM8058_LED_TYPE_COMMON_MASK 0xf8
17 #define PM8058_LED_TYPE_KEYPAD_MASK 0xf0
18 #define PM8058_LED_TYPE_COMMON_SHIFT 3
19 #define PM8058_LED_TYPE_KEYPAD_SHIFT 4
25 struct led_classdev cdev;
28 static void pm8058_led_set(struct led_classdev *cled,
29 enum led_brightness value)
31 struct pm8058_led *led;
33 unsigned int mask = 0;
36 led = container_of(cled, struct pm8058_led, cdev);
37 switch (led->ledtype) {
38 case PM8058_LED_TYPE_COMMON:
39 mask = PM8058_LED_TYPE_COMMON_MASK;
40 val = value << PM8058_LED_TYPE_COMMON_SHIFT;
42 case PM8058_LED_TYPE_KEYPAD:
43 case PM8058_LED_TYPE_FLASH:
44 mask = PM8058_LED_TYPE_KEYPAD_MASK;
45 val = value << PM8058_LED_TYPE_KEYPAD_SHIFT;
51 ret = regmap_update_bits(led->map, led->reg, mask, val);
53 pr_err("Failed to set LED brightness\n");
56 static enum led_brightness pm8058_led_get(struct led_classdev *cled)
58 struct pm8058_led *led;
62 led = container_of(cled, struct pm8058_led, cdev);
64 ret = regmap_read(led->map, led->reg, &val);
66 pr_err("Failed to get LED brightness\n");
70 switch (led->ledtype) {
71 case PM8058_LED_TYPE_COMMON:
72 val &= PM8058_LED_TYPE_COMMON_MASK;
73 val >>= PM8058_LED_TYPE_COMMON_SHIFT;
75 case PM8058_LED_TYPE_KEYPAD:
76 case PM8058_LED_TYPE_FLASH:
77 val &= PM8058_LED_TYPE_KEYPAD_MASK;
78 val >>= PM8058_LED_TYPE_KEYPAD_SHIFT;
88 static int pm8058_led_probe(struct platform_device *pdev)
90 struct led_init_data init_data = {};
91 struct device *dev = &pdev->dev;
92 struct pm8058_led *led;
93 struct device_node *np;
96 enum led_brightness maxbright;
97 enum led_default_state state;
99 led = devm_kzalloc(dev, sizeof(*led), GFP_KERNEL);
103 led->ledtype = (u32)(unsigned long)of_device_get_match_data(dev);
105 map = dev_get_regmap(dev->parent, NULL);
107 dev_err(dev, "Parent regmap unavailable.\n");
112 np = dev_of_node(dev);
114 ret = of_property_read_u32(np, "reg", &led->reg);
116 dev_err(dev, "no register offset specified\n");
120 led->cdev.brightness_set = pm8058_led_set;
121 led->cdev.brightness_get = pm8058_led_get;
122 if (led->ledtype == PM8058_LED_TYPE_COMMON)
123 maxbright = 31; /* 5 bits */
125 maxbright = 15; /* 4 bits */
126 led->cdev.max_brightness = maxbright;
128 init_data.fwnode = of_fwnode_handle(np);
130 state = led_init_default_state_get(init_data.fwnode);
132 case LEDS_DEFSTATE_ON:
133 led->cdev.brightness = maxbright;
134 pm8058_led_set(&led->cdev, maxbright);
136 case LEDS_DEFSTATE_KEEP:
137 led->cdev.brightness = pm8058_led_get(&led->cdev);
140 led->cdev.brightness = LED_OFF;
141 pm8058_led_set(&led->cdev, LED_OFF);
144 if (led->ledtype == PM8058_LED_TYPE_KEYPAD ||
145 led->ledtype == PM8058_LED_TYPE_FLASH)
146 led->cdev.flags = LED_CORE_SUSPENDRESUME;
148 ret = devm_led_classdev_register_ext(dev, &led->cdev, &init_data);
150 dev_err(dev, "Failed to register LED for %pOF\n", np);
155 static const struct of_device_id pm8058_leds_id_table[] = {
157 .compatible = "qcom,pm8058-led",
158 .data = (void *)PM8058_LED_TYPE_COMMON
161 .compatible = "qcom,pm8058-keypad-led",
162 .data = (void *)PM8058_LED_TYPE_KEYPAD
165 .compatible = "qcom,pm8058-flash-led",
166 .data = (void *)PM8058_LED_TYPE_FLASH
170 MODULE_DEVICE_TABLE(of, pm8058_leds_id_table);
172 static struct platform_driver pm8058_led_driver = {
173 .probe = pm8058_led_probe,
175 .name = "pm8058-leds",
176 .of_match_table = pm8058_leds_id_table,
179 module_platform_driver(pm8058_led_driver);
181 MODULE_DESCRIPTION("PM8058 LEDs driver");
182 MODULE_LICENSE("GPL v2");
183 MODULE_ALIAS("platform:pm8058-leds");