tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0
2// LED Multicolor class interface
3// Copyright (C) 2019-20 Texas Instruments Incorporated - http://www.ti.com/
4// Author: Dan Murphy <dmurphy@ti.com>
5
6#include <linux/device.h>
7#include <linux/init.h>
8#include <linux/led-class-multicolor.h>
9#include <linux/math.h>
10#include <linux/module.h>
11#include <linux/slab.h>
12#include <linux/uaccess.h>
13
14int led_mc_calc_color_components(struct led_classdev_mc *mcled_cdev,
15 enum led_brightness brightness)
16{
17 struct led_classdev *led_cdev = &mcled_cdev->led_cdev;
18 int i;
19
20 for (i = 0; i < mcled_cdev->num_colors; i++)
21 mcled_cdev->subled_info[i].brightness =
22 DIV_ROUND_CLOSEST(brightness *
23 mcled_cdev->subled_info[i].intensity,
24 led_cdev->max_brightness);
25
26 return 0;
27}
28EXPORT_SYMBOL_GPL(led_mc_calc_color_components);
29
30static ssize_t multi_intensity_store(struct device *dev,
31 struct device_attribute *intensity_attr,
32 const char *buf, size_t size)
33{
34 struct led_classdev *led_cdev = dev_get_drvdata(dev);
35 struct led_classdev_mc *mcled_cdev = lcdev_to_mccdev(led_cdev);
36 int nrchars, offset = 0;
37 int intensity_value[LED_COLOR_ID_MAX];
38 int i;
39 ssize_t ret;
40
41 mutex_lock(&led_cdev->led_access);
42
43 for (i = 0; i < mcled_cdev->num_colors; i++) {
44 ret = sscanf(buf + offset, "%i%n",
45 &intensity_value[i], &nrchars);
46 if (ret != 1) {
47 ret = -EINVAL;
48 goto err_out;
49 }
50 offset += nrchars;
51 }
52
53 offset++;
54 if (offset < size) {
55 ret = -EINVAL;
56 goto err_out;
57 }
58
59 for (i = 0; i < mcled_cdev->num_colors; i++)
60 mcled_cdev->subled_info[i].intensity = intensity_value[i];
61
62 led_set_brightness(led_cdev, led_cdev->brightness);
63 ret = size;
64err_out:
65 mutex_unlock(&led_cdev->led_access);
66 return ret;
67}
68
69static ssize_t multi_intensity_show(struct device *dev,
70 struct device_attribute *intensity_attr,
71 char *buf)
72{
73 struct led_classdev *led_cdev = dev_get_drvdata(dev);
74 struct led_classdev_mc *mcled_cdev = lcdev_to_mccdev(led_cdev);
75 int len = 0;
76 int i;
77
78 for (i = 0; i < mcled_cdev->num_colors; i++) {
79 len += sprintf(buf + len, "%d",
80 mcled_cdev->subled_info[i].intensity);
81 if (i < mcled_cdev->num_colors - 1)
82 len += sprintf(buf + len, " ");
83 }
84
85 buf[len++] = '\n';
86 return len;
87}
88static DEVICE_ATTR_RW(multi_intensity);
89
90static ssize_t multi_index_show(struct device *dev,
91 struct device_attribute *multi_index_attr,
92 char *buf)
93{
94 struct led_classdev *led_cdev = dev_get_drvdata(dev);
95 struct led_classdev_mc *mcled_cdev = lcdev_to_mccdev(led_cdev);
96 int len = 0;
97 int index;
98 int i;
99
100 for (i = 0; i < mcled_cdev->num_colors; i++) {
101 index = mcled_cdev->subled_info[i].color_index;
102 len += sprintf(buf + len, "%s", led_get_color_name(index));
103 if (i < mcled_cdev->num_colors - 1)
104 len += sprintf(buf + len, " ");
105 }
106
107 buf[len++] = '\n';
108 return len;
109}
110static DEVICE_ATTR_RO(multi_index);
111
112static struct attribute *led_multicolor_attrs[] = {
113 &dev_attr_multi_intensity.attr,
114 &dev_attr_multi_index.attr,
115 NULL,
116};
117ATTRIBUTE_GROUPS(led_multicolor);
118
119int led_classdev_multicolor_register_ext(struct device *parent,
120 struct led_classdev_mc *mcled_cdev,
121 struct led_init_data *init_data)
122{
123 struct led_classdev *led_cdev;
124
125 if (!mcled_cdev)
126 return -EINVAL;
127
128 if (mcled_cdev->num_colors <= 0)
129 return -EINVAL;
130
131 if (mcled_cdev->num_colors > LED_COLOR_ID_MAX)
132 return -EINVAL;
133
134 led_cdev = &mcled_cdev->led_cdev;
135 led_cdev->flags |= LED_MULTI_COLOR;
136 mcled_cdev->led_cdev.groups = led_multicolor_groups;
137
138 return led_classdev_register_ext(parent, led_cdev, init_data);
139}
140EXPORT_SYMBOL_GPL(led_classdev_multicolor_register_ext);
141
142void led_classdev_multicolor_unregister(struct led_classdev_mc *mcled_cdev)
143{
144 if (!mcled_cdev)
145 return;
146
147 led_classdev_unregister(&mcled_cdev->led_cdev);
148}
149EXPORT_SYMBOL_GPL(led_classdev_multicolor_unregister);
150
151static void devm_led_classdev_multicolor_release(struct device *dev, void *res)
152{
153 led_classdev_multicolor_unregister(*(struct led_classdev_mc **)res);
154}
155
156int devm_led_classdev_multicolor_register_ext(struct device *parent,
157 struct led_classdev_mc *mcled_cdev,
158 struct led_init_data *init_data)
159{
160 struct led_classdev_mc **dr;
161 int ret;
162
163 dr = devres_alloc(devm_led_classdev_multicolor_release,
164 sizeof(*dr), GFP_KERNEL);
165 if (!dr)
166 return -ENOMEM;
167
168 ret = led_classdev_multicolor_register_ext(parent, mcled_cdev,
169 init_data);
170 if (ret) {
171 devres_free(dr);
172 return ret;
173 }
174
175 *dr = mcled_cdev;
176 devres_add(parent, dr);
177
178 return 0;
179}
180EXPORT_SYMBOL_GPL(devm_led_classdev_multicolor_register_ext);
181
182static int devm_led_classdev_multicolor_match(struct device *dev,
183 void *res, void *data)
184{
185 struct led_classdev_mc **p = res;
186
187 if (WARN_ON(!p || !*p))
188 return 0;
189
190 return *p == data;
191}
192
193void devm_led_classdev_multicolor_unregister(struct device *dev,
194 struct led_classdev_mc *mcled_cdev)
195{
196 WARN_ON(devres_release(dev,
197 devm_led_classdev_multicolor_release,
198 devm_led_classdev_multicolor_match, mcled_cdev));
199}
200EXPORT_SYMBOL_GPL(devm_led_classdev_multicolor_unregister);
201
202MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com>");
203MODULE_DESCRIPTION("Multicolor LED class interface");
204MODULE_LICENSE("GPL v2");