1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0+
2*4882a593Smuzhiyun
3*4882a593Smuzhiyun #include <linux/leds.h>
4*4882a593Smuzhiyun #include <linux/module.h>
5*4882a593Smuzhiyun #include <linux/platform_device.h>
6*4882a593Smuzhiyun #include <linux/regmap.h>
7*4882a593Smuzhiyun
8*4882a593Smuzhiyun #define A500_EC_LED_DELAY_USEC (100 * 1000)
9*4882a593Smuzhiyun
10*4882a593Smuzhiyun enum {
11*4882a593Smuzhiyun REG_RESET_LEDS = 0x40,
12*4882a593Smuzhiyun REG_POWER_LED_ON = 0x42,
13*4882a593Smuzhiyun REG_CHARGE_LED_ON = 0x43,
14*4882a593Smuzhiyun REG_ANDROID_LEDS_OFF = 0x5a,
15*4882a593Smuzhiyun };
16*4882a593Smuzhiyun
17*4882a593Smuzhiyun struct a500_led {
18*4882a593Smuzhiyun struct led_classdev cdev;
19*4882a593Smuzhiyun const struct reg_sequence *enable_seq;
20*4882a593Smuzhiyun struct a500_led *other;
21*4882a593Smuzhiyun struct regmap *rmap;
22*4882a593Smuzhiyun };
23*4882a593Smuzhiyun
24*4882a593Smuzhiyun static const struct reg_sequence a500_ec_leds_reset_seq[] = {
25*4882a593Smuzhiyun REG_SEQ(REG_RESET_LEDS, 0x0, A500_EC_LED_DELAY_USEC),
26*4882a593Smuzhiyun REG_SEQ(REG_ANDROID_LEDS_OFF, 0x0, A500_EC_LED_DELAY_USEC),
27*4882a593Smuzhiyun };
28*4882a593Smuzhiyun
29*4882a593Smuzhiyun static const struct reg_sequence a500_ec_white_led_enable_seq[] = {
30*4882a593Smuzhiyun REG_SEQ(REG_POWER_LED_ON, 0x0, A500_EC_LED_DELAY_USEC),
31*4882a593Smuzhiyun };
32*4882a593Smuzhiyun
33*4882a593Smuzhiyun static const struct reg_sequence a500_ec_orange_led_enable_seq[] = {
34*4882a593Smuzhiyun REG_SEQ(REG_CHARGE_LED_ON, 0x0, A500_EC_LED_DELAY_USEC),
35*4882a593Smuzhiyun };
36*4882a593Smuzhiyun
a500_ec_led_brightness_set(struct led_classdev * led_cdev,enum led_brightness value)37*4882a593Smuzhiyun static int a500_ec_led_brightness_set(struct led_classdev *led_cdev,
38*4882a593Smuzhiyun enum led_brightness value)
39*4882a593Smuzhiyun {
40*4882a593Smuzhiyun struct a500_led *led = container_of(led_cdev, struct a500_led, cdev);
41*4882a593Smuzhiyun struct reg_sequence control_seq[2];
42*4882a593Smuzhiyun unsigned int num_regs = 1;
43*4882a593Smuzhiyun
44*4882a593Smuzhiyun if (value) {
45*4882a593Smuzhiyun control_seq[0] = led->enable_seq[0];
46*4882a593Smuzhiyun } else {
47*4882a593Smuzhiyun /*
48*4882a593Smuzhiyun * There is no separate controls which can disable LEDs
49*4882a593Smuzhiyun * individually, there is only RESET_LEDS command that turns
50*4882a593Smuzhiyun * off both LEDs.
51*4882a593Smuzhiyun *
52*4882a593Smuzhiyun * RESET_LEDS turns off both LEDs, thus restore other LED if
53*4882a593Smuzhiyun * it's turned ON.
54*4882a593Smuzhiyun */
55*4882a593Smuzhiyun if (led->other->cdev.brightness)
56*4882a593Smuzhiyun num_regs = 2;
57*4882a593Smuzhiyun
58*4882a593Smuzhiyun control_seq[0] = a500_ec_leds_reset_seq[0];
59*4882a593Smuzhiyun control_seq[1] = led->other->enable_seq[0];
60*4882a593Smuzhiyun }
61*4882a593Smuzhiyun
62*4882a593Smuzhiyun return regmap_multi_reg_write(led->rmap, control_seq, num_regs);
63*4882a593Smuzhiyun }
64*4882a593Smuzhiyun
a500_ec_leds_probe(struct platform_device * pdev)65*4882a593Smuzhiyun static int a500_ec_leds_probe(struct platform_device *pdev)
66*4882a593Smuzhiyun {
67*4882a593Smuzhiyun struct a500_led *white_led, *orange_led;
68*4882a593Smuzhiyun struct regmap *rmap;
69*4882a593Smuzhiyun int err;
70*4882a593Smuzhiyun
71*4882a593Smuzhiyun rmap = dev_get_regmap(pdev->dev.parent, "KB930");
72*4882a593Smuzhiyun if (!rmap)
73*4882a593Smuzhiyun return -EINVAL;
74*4882a593Smuzhiyun
75*4882a593Smuzhiyun /* reset and turn off LEDs */
76*4882a593Smuzhiyun regmap_multi_reg_write(rmap, a500_ec_leds_reset_seq, 2);
77*4882a593Smuzhiyun
78*4882a593Smuzhiyun white_led = devm_kzalloc(&pdev->dev, sizeof(*white_led), GFP_KERNEL);
79*4882a593Smuzhiyun if (!white_led)
80*4882a593Smuzhiyun return -ENOMEM;
81*4882a593Smuzhiyun
82*4882a593Smuzhiyun white_led->cdev.name = "power:white";
83*4882a593Smuzhiyun white_led->cdev.brightness_set_blocking = a500_ec_led_brightness_set;
84*4882a593Smuzhiyun white_led->cdev.flags = LED_CORE_SUSPENDRESUME;
85*4882a593Smuzhiyun white_led->cdev.max_brightness = 1;
86*4882a593Smuzhiyun white_led->enable_seq = a500_ec_white_led_enable_seq;
87*4882a593Smuzhiyun white_led->rmap = rmap;
88*4882a593Smuzhiyun
89*4882a593Smuzhiyun orange_led = devm_kzalloc(&pdev->dev, sizeof(*orange_led), GFP_KERNEL);
90*4882a593Smuzhiyun if (!orange_led)
91*4882a593Smuzhiyun return -ENOMEM;
92*4882a593Smuzhiyun
93*4882a593Smuzhiyun orange_led->cdev.name = "power:orange";
94*4882a593Smuzhiyun orange_led->cdev.brightness_set_blocking = a500_ec_led_brightness_set;
95*4882a593Smuzhiyun orange_led->cdev.flags = LED_CORE_SUSPENDRESUME;
96*4882a593Smuzhiyun orange_led->cdev.max_brightness = 1;
97*4882a593Smuzhiyun orange_led->enable_seq = a500_ec_orange_led_enable_seq;
98*4882a593Smuzhiyun orange_led->rmap = rmap;
99*4882a593Smuzhiyun
100*4882a593Smuzhiyun white_led->other = orange_led;
101*4882a593Smuzhiyun orange_led->other = white_led;
102*4882a593Smuzhiyun
103*4882a593Smuzhiyun err = devm_led_classdev_register(&pdev->dev, &white_led->cdev);
104*4882a593Smuzhiyun if (err) {
105*4882a593Smuzhiyun dev_err(&pdev->dev, "failed to register white LED\n");
106*4882a593Smuzhiyun return err;
107*4882a593Smuzhiyun }
108*4882a593Smuzhiyun
109*4882a593Smuzhiyun err = devm_led_classdev_register(&pdev->dev, &orange_led->cdev);
110*4882a593Smuzhiyun if (err) {
111*4882a593Smuzhiyun dev_err(&pdev->dev, "failed to register orange LED\n");
112*4882a593Smuzhiyun return err;
113*4882a593Smuzhiyun }
114*4882a593Smuzhiyun
115*4882a593Smuzhiyun return 0;
116*4882a593Smuzhiyun }
117*4882a593Smuzhiyun
118*4882a593Smuzhiyun static struct platform_driver a500_ec_leds_driver = {
119*4882a593Smuzhiyun .driver = {
120*4882a593Smuzhiyun .name = "acer-a500-iconia-leds",
121*4882a593Smuzhiyun },
122*4882a593Smuzhiyun .probe = a500_ec_leds_probe,
123*4882a593Smuzhiyun };
124*4882a593Smuzhiyun module_platform_driver(a500_ec_leds_driver);
125*4882a593Smuzhiyun
126*4882a593Smuzhiyun MODULE_DESCRIPTION("LED driver for Acer Iconia Tab A500 Power Button");
127*4882a593Smuzhiyun MODULE_AUTHOR("Dmitry Osipenko <digetx@gmail.com>");
128*4882a593Smuzhiyun MODULE_ALIAS("platform:acer-a500-iconia-leds");
129*4882a593Smuzhiyun MODULE_LICENSE("GPL");
130