1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * LEDs driver for Dialog Semiconductor DA9030/DA9034
4  *
5  * Copyright (C) 2008 Compulab, Ltd.
6  *	Mike Rapoport <mike@compulab.co.il>
7  *
8  * Copyright (C) 2006-2008 Marvell International Ltd.
9  *	Eric Miao <eric.miao@marvell.com>
10  */
11 
12 #include <linux/module.h>
13 #include <linux/kernel.h>
14 #include <linux/platform_device.h>
15 #include <linux/leds.h>
16 #include <linux/mfd/da903x.h>
17 #include <linux/slab.h>
18 
19 #define DA9030_LED1_CONTROL	0x20
20 #define DA9030_LED2_CONTROL	0x21
21 #define DA9030_LED3_CONTROL	0x22
22 #define DA9030_LED4_CONTROL	0x23
23 #define DA9030_LEDPC_CONTROL	0x24
24 #define DA9030_MISC_CONTROL_A	0x26	/* Vibrator Control */
25 
26 #define DA9034_LED1_CONTROL	0x35
27 #define DA9034_LED2_CONTROL	0x36
28 #define DA9034_VIBRA		0x40
29 
30 struct da903x_led {
31 	struct led_classdev	cdev;
32 	struct device		*master;
33 	int			id;
34 	int			flags;
35 };
36 
37 #define DA9030_LED_OFFSET(id)	((id) - DA9030_ID_LED_1)
38 #define DA9034_LED_OFFSET(id)	((id) - DA9034_ID_LED_1)
39 
da903x_led_set(struct led_classdev * led_cdev,enum led_brightness value)40 static int da903x_led_set(struct led_classdev *led_cdev,
41 			   enum led_brightness value)
42 {
43 	struct da903x_led *led =
44 			container_of(led_cdev, struct da903x_led, cdev);
45 	uint8_t val;
46 	int offset, ret = -EINVAL;
47 
48 	switch (led->id) {
49 	case DA9030_ID_LED_1:
50 	case DA9030_ID_LED_2:
51 	case DA9030_ID_LED_3:
52 	case DA9030_ID_LED_4:
53 	case DA9030_ID_LED_PC:
54 		offset = DA9030_LED_OFFSET(led->id);
55 		val = led->flags & ~0x87;
56 		val |= value ? 0x80 : 0; /* EN bit */
57 		val |= (0x7 - (value >> 5)) & 0x7; /* PWM<2:0> */
58 		ret = da903x_write(led->master, DA9030_LED1_CONTROL + offset,
59 				   val);
60 		break;
61 	case DA9030_ID_VIBRA:
62 		val = led->flags & ~0x80;
63 		val |= value ? 0x80 : 0; /* EN bit */
64 		ret = da903x_write(led->master, DA9030_MISC_CONTROL_A, val);
65 		break;
66 	case DA9034_ID_LED_1:
67 	case DA9034_ID_LED_2:
68 		offset = DA9034_LED_OFFSET(led->id);
69 		val = (value * 0x5f / LED_FULL) & 0x7f;
70 		val |= (led->flags & DA9034_LED_RAMP) ? 0x80 : 0;
71 		ret = da903x_write(led->master, DA9034_LED1_CONTROL + offset,
72 				   val);
73 		break;
74 	case DA9034_ID_VIBRA:
75 		val = value & 0xfe;
76 		ret = da903x_write(led->master, DA9034_VIBRA, val);
77 		break;
78 	}
79 
80 	return ret;
81 }
82 
da903x_led_probe(struct platform_device * pdev)83 static int da903x_led_probe(struct platform_device *pdev)
84 {
85 	struct led_info *pdata = dev_get_platdata(&pdev->dev);
86 	struct da903x_led *led;
87 	int id, ret;
88 
89 	if (pdata == NULL)
90 		return 0;
91 
92 	id = pdev->id;
93 
94 	if (!((id >= DA9030_ID_LED_1 && id <= DA9030_ID_VIBRA) ||
95 	      (id >= DA9034_ID_LED_1 && id <= DA9034_ID_VIBRA))) {
96 		dev_err(&pdev->dev, "invalid LED ID (%d) specified\n", id);
97 		return -EINVAL;
98 	}
99 
100 	led = devm_kzalloc(&pdev->dev, sizeof(struct da903x_led), GFP_KERNEL);
101 	if (!led)
102 		return -ENOMEM;
103 
104 	led->cdev.name = pdata->name;
105 	led->cdev.default_trigger = pdata->default_trigger;
106 	led->cdev.brightness_set_blocking = da903x_led_set;
107 	led->cdev.brightness = LED_OFF;
108 
109 	led->id = id;
110 	led->flags = pdata->flags;
111 	led->master = pdev->dev.parent;
112 
113 	ret = led_classdev_register(led->master, &led->cdev);
114 	if (ret) {
115 		dev_err(&pdev->dev, "failed to register LED %d\n", id);
116 		return ret;
117 	}
118 
119 	platform_set_drvdata(pdev, led);
120 
121 	return 0;
122 }
123 
da903x_led_remove(struct platform_device * pdev)124 static int da903x_led_remove(struct platform_device *pdev)
125 {
126 	struct da903x_led *led = platform_get_drvdata(pdev);
127 
128 	led_classdev_unregister(&led->cdev);
129 
130 	return 0;
131 }
132 
133 static struct platform_driver da903x_led_driver = {
134 	.driver	= {
135 		.name	= "da903x-led",
136 	},
137 	.probe		= da903x_led_probe,
138 	.remove		= da903x_led_remove,
139 };
140 
141 module_platform_driver(da903x_led_driver);
142 
143 MODULE_DESCRIPTION("LEDs driver for Dialog Semiconductor DA9030/DA9034");
144 MODULE_AUTHOR("Eric Miao <eric.miao@marvell.com>");
145 MODULE_AUTHOR("Mike Rapoport <mike@compulab.co.il>");
146 MODULE_LICENSE("GPL");
147 MODULE_ALIAS("platform:da903x-led");
148