xref: /openbmc/linux/drivers/leds/leds-da9052.c (revision 2874c5fd)
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * LED Driver for Dialog DA9052 PMICs.
4  *
5  * Copyright(c) 2012 Dialog Semiconductor Ltd.
6  *
7  * Author: David Dajun Chen <dchen@diasemi.com>
8  */
9 
10 #include <linux/module.h>
11 #include <linux/kernel.h>
12 #include <linux/platform_device.h>
13 #include <linux/leds.h>
14 #include <linux/slab.h>
15 
16 #include <linux/mfd/da9052/reg.h>
17 #include <linux/mfd/da9052/da9052.h>
18 #include <linux/mfd/da9052/pdata.h>
19 
20 #define DA9052_OPENDRAIN_OUTPUT	2
21 #define DA9052_SET_HIGH_LVL_OUTPUT	(1 << 3)
22 #define DA9052_MASK_UPPER_NIBBLE	0xF0
23 #define DA9052_MASK_LOWER_NIBBLE	0x0F
24 #define DA9052_NIBBLE_SHIFT		4
25 #define DA9052_MAX_BRIGHTNESS		0x5f
26 
27 struct da9052_led {
28 	struct led_classdev cdev;
29 	struct da9052 *da9052;
30 	unsigned char led_index;
31 	unsigned char id;
32 };
33 
34 static unsigned char led_reg[] = {
35 	DA9052_LED_CONT_4_REG,
36 	DA9052_LED_CONT_5_REG,
37 };
38 
da9052_set_led_brightness(struct da9052_led * led,enum led_brightness brightness)39 static int da9052_set_led_brightness(struct da9052_led *led,
40 				     enum led_brightness brightness)
41 {
42 	u8 val;
43 	int error;
44 
45 	val = (brightness & 0x7f) | DA9052_LED_CONT_DIM;
46 
47 	error = da9052_reg_write(led->da9052, led_reg[led->led_index], val);
48 	if (error < 0)
49 		dev_err(led->da9052->dev, "Failed to set led brightness, %d\n",
50 			error);
51 	return error;
52 }
53 
da9052_led_set(struct led_classdev * led_cdev,enum led_brightness value)54 static int da9052_led_set(struct led_classdev *led_cdev,
55 			   enum led_brightness value)
56 {
57 	struct da9052_led *led =
58 			container_of(led_cdev, struct da9052_led, cdev);
59 
60 	return da9052_set_led_brightness(led, value);
61 }
62 
da9052_configure_leds(struct da9052 * da9052)63 static int da9052_configure_leds(struct da9052 *da9052)
64 {
65 	int error;
66 	unsigned char register_value = DA9052_OPENDRAIN_OUTPUT
67 				       | DA9052_SET_HIGH_LVL_OUTPUT;
68 
69 	error = da9052_reg_update(da9052, DA9052_GPIO_14_15_REG,
70 				  DA9052_MASK_LOWER_NIBBLE,
71 				  register_value);
72 
73 	if (error < 0) {
74 		dev_err(da9052->dev, "Failed to write GPIO 14-15 reg, %d\n",
75 			error);
76 		return error;
77 	}
78 
79 	error = da9052_reg_update(da9052, DA9052_GPIO_14_15_REG,
80 				  DA9052_MASK_UPPER_NIBBLE,
81 				  register_value << DA9052_NIBBLE_SHIFT);
82 	if (error < 0)
83 		dev_err(da9052->dev, "Failed to write GPIO 14-15 reg, %d\n",
84 			error);
85 
86 	return error;
87 }
88 
da9052_led_probe(struct platform_device * pdev)89 static int da9052_led_probe(struct platform_device *pdev)
90 {
91 	struct da9052_pdata *pdata;
92 	struct da9052 *da9052;
93 	struct led_platform_data *pled;
94 	struct da9052_led *led = NULL;
95 	int error = -ENODEV;
96 	int i;
97 
98 	da9052 = dev_get_drvdata(pdev->dev.parent);
99 	pdata = dev_get_platdata(da9052->dev);
100 	if (pdata == NULL) {
101 		dev_err(&pdev->dev, "No platform data\n");
102 		goto err;
103 	}
104 
105 	pled = pdata->pled;
106 	if (pled == NULL) {
107 		dev_err(&pdev->dev, "No platform data for LED\n");
108 		goto err;
109 	}
110 
111 	led = devm_kcalloc(&pdev->dev,
112 			   pled->num_leds, sizeof(struct da9052_led),
113 			   GFP_KERNEL);
114 	if (!led) {
115 		error = -ENOMEM;
116 		goto err;
117 	}
118 
119 	for (i = 0; i < pled->num_leds; i++) {
120 		led[i].cdev.name = pled->leds[i].name;
121 		led[i].cdev.brightness_set_blocking = da9052_led_set;
122 		led[i].cdev.brightness = LED_OFF;
123 		led[i].cdev.max_brightness = DA9052_MAX_BRIGHTNESS;
124 		led[i].led_index = pled->leds[i].flags;
125 		led[i].da9052 = dev_get_drvdata(pdev->dev.parent);
126 
127 		error = led_classdev_register(pdev->dev.parent, &led[i].cdev);
128 		if (error) {
129 			dev_err(&pdev->dev, "Failed to register led %d\n",
130 				led[i].led_index);
131 			goto err_register;
132 		}
133 
134 		error = da9052_set_led_brightness(&led[i],
135 						  led[i].cdev.brightness);
136 		if (error) {
137 			dev_err(&pdev->dev, "Unable to init led %d\n",
138 				led[i].led_index);
139 			continue;
140 		}
141 	}
142 	error = da9052_configure_leds(led->da9052);
143 	if (error) {
144 		dev_err(&pdev->dev, "Failed to configure GPIO LED%d\n", error);
145 		goto err_register;
146 	}
147 
148 	platform_set_drvdata(pdev, led);
149 
150 	return 0;
151 
152 err_register:
153 	for (i = i - 1; i >= 0; i--)
154 		led_classdev_unregister(&led[i].cdev);
155 err:
156 	return error;
157 }
158 
da9052_led_remove(struct platform_device * pdev)159 static int da9052_led_remove(struct platform_device *pdev)
160 {
161 	struct da9052_led *led = platform_get_drvdata(pdev);
162 	struct da9052_pdata *pdata;
163 	struct da9052 *da9052;
164 	struct led_platform_data *pled;
165 	int i;
166 
167 	da9052 = dev_get_drvdata(pdev->dev.parent);
168 	pdata = dev_get_platdata(da9052->dev);
169 	pled = pdata->pled;
170 
171 	for (i = 0; i < pled->num_leds; i++) {
172 		da9052_set_led_brightness(&led[i], LED_OFF);
173 		led_classdev_unregister(&led[i].cdev);
174 	}
175 
176 	return 0;
177 }
178 
179 static struct platform_driver da9052_led_driver = {
180 	.driver		= {
181 		.name	= "da9052-leds",
182 	},
183 	.probe		= da9052_led_probe,
184 	.remove		= da9052_led_remove,
185 };
186 
187 module_platform_driver(da9052_led_driver);
188 
189 MODULE_AUTHOR("Dialog Semiconductor Ltd <dchen@diasemi.com>");
190 MODULE_DESCRIPTION("LED driver for Dialog DA9052 PMIC");
191 MODULE_LICENSE("GPL");
192