1
2
3
4
5
6#include <linux/device.h>
7#include <linux/init.h>
8#include <linux/led-class-multicolor.h>
9#include <linux/module.h>
10#include <linux/slab.h>
11#include <linux/uaccess.h>
12
13#include "leds.h"
14
15int led_mc_calc_color_components(struct led_classdev_mc *mcled_cdev,
16 enum led_brightness brightness)
17{
18 struct led_classdev *led_cdev = &mcled_cdev->led_cdev;
19 int i;
20
21 for (i = 0; i < mcled_cdev->num_colors; i++)
22 mcled_cdev->subled_info[i].brightness = 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_colors[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 mcled_cdev->led_cdev.groups = led_multicolor_groups;
136
137 return led_classdev_register_ext(parent, led_cdev, init_data);
138}
139EXPORT_SYMBOL_GPL(led_classdev_multicolor_register_ext);
140
141void led_classdev_multicolor_unregister(struct led_classdev_mc *mcled_cdev)
142{
143 if (!mcled_cdev)
144 return;
145
146 led_classdev_unregister(&mcled_cdev->led_cdev);
147}
148EXPORT_SYMBOL_GPL(led_classdev_multicolor_unregister);
149
150static void devm_led_classdev_multicolor_release(struct device *dev, void *res)
151{
152 led_classdev_multicolor_unregister(*(struct led_classdev_mc **)res);
153}
154
155int devm_led_classdev_multicolor_register_ext(struct device *parent,
156 struct led_classdev_mc *mcled_cdev,
157 struct led_init_data *init_data)
158{
159 struct led_classdev_mc **dr;
160 int ret;
161
162 dr = devres_alloc(devm_led_classdev_multicolor_release,
163 sizeof(*dr), GFP_KERNEL);
164 if (!dr)
165 return -ENOMEM;
166
167 ret = led_classdev_multicolor_register_ext(parent, mcled_cdev,
168 init_data);
169 if (ret) {
170 devres_free(dr);
171 return ret;
172 }
173
174 *dr = mcled_cdev;
175 devres_add(parent, dr);
176
177 return 0;
178}
179EXPORT_SYMBOL_GPL(devm_led_classdev_multicolor_register_ext);
180
181static int devm_led_classdev_multicolor_match(struct device *dev,
182 void *res, void *data)
183{
184 struct led_classdev_mc **p = res;
185
186 if (WARN_ON(!p || !*p))
187 return 0;
188
189 return *p == data;
190}
191
192void devm_led_classdev_multicolor_unregister(struct device *dev,
193 struct led_classdev_mc *mcled_cdev)
194{
195 WARN_ON(devres_release(dev,
196 devm_led_classdev_multicolor_release,
197 devm_led_classdev_multicolor_match, mcled_cdev));
198}
199EXPORT_SYMBOL_GPL(devm_led_classdev_multicolor_unregister);
200
201MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com>");
202MODULE_DESCRIPTION("Multicolor LED class interface");
203MODULE_LICENSE("GPL v2");
204
