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8#include <linux/i2c.h>
9#include <linux/led-class-multicolor.h>
10#include <linux/module.h>
11#include <linux/mutex.h>
12#include <linux/of.h>
13#include "leds.h"
14
15#define OMNIA_BOARD_LEDS 12
16#define OMNIA_LED_NUM_CHANNELS 3
17
18#define CMD_LED_MODE 3
19#define CMD_LED_MODE_LED(l) ((l) & 0x0f)
20#define CMD_LED_MODE_USER 0x10
21
22#define CMD_LED_STATE 4
23#define CMD_LED_STATE_LED(l) ((l) & 0x0f)
24#define CMD_LED_STATE_ON 0x10
25
26#define CMD_LED_COLOR 5
27#define CMD_LED_SET_BRIGHTNESS 7
28#define CMD_LED_GET_BRIGHTNESS 8
29
30struct omnia_led {
31 struct led_classdev_mc mc_cdev;
32 struct mc_subled subled_info[OMNIA_LED_NUM_CHANNELS];
33 int reg;
34};
35
36#define to_omnia_led(l) container_of(l, struct omnia_led, mc_cdev)
37
38struct omnia_leds {
39 struct i2c_client *client;
40 struct mutex lock;
41 struct omnia_led leds[];
42};
43
44static int omnia_led_brightness_set_blocking(struct led_classdev *cdev,
45 enum led_brightness brightness)
46{
47 struct led_classdev_mc *mc_cdev = lcdev_to_mccdev(cdev);
48 struct omnia_leds *leds = dev_get_drvdata(cdev->dev->parent);
49 struct omnia_led *led = to_omnia_led(mc_cdev);
50 u8 buf[5], state;
51 int ret;
52
53 mutex_lock(&leds->lock);
54
55 led_mc_calc_color_components(&led->mc_cdev, brightness);
56
57 buf[0] = CMD_LED_COLOR;
58 buf[1] = led->reg;
59 buf[2] = mc_cdev->subled_info[0].brightness;
60 buf[3] = mc_cdev->subled_info[1].brightness;
61 buf[4] = mc_cdev->subled_info[2].brightness;
62
63 state = CMD_LED_STATE_LED(led->reg);
64 if (buf[2] || buf[3] || buf[4])
65 state |= CMD_LED_STATE_ON;
66
67 ret = i2c_smbus_write_byte_data(leds->client, CMD_LED_STATE, state);
68 if (ret >= 0 && (state & CMD_LED_STATE_ON))
69 ret = i2c_master_send(leds->client, buf, 5);
70
71 mutex_unlock(&leds->lock);
72
73 return ret;
74}
75
76static int omnia_led_register(struct i2c_client *client, struct omnia_led *led,
77 struct device_node *np)
78{
79 struct led_init_data init_data = {};
80 struct device *dev = &client->dev;
81 struct led_classdev *cdev;
82 int ret, color;
83
84 ret = of_property_read_u32(np, "reg", &led->reg);
85 if (ret || led->reg >= OMNIA_BOARD_LEDS) {
86 dev_warn(dev,
87 "Node %pOF: must contain 'reg' property with values between 0 and %i\n",
88 np, OMNIA_BOARD_LEDS - 1);
89 return 0;
90 }
91
92 ret = of_property_read_u32(np, "color", &color);
93 if (ret || color != LED_COLOR_ID_RGB) {
94 dev_warn(dev,
95 "Node %pOF: must contain 'color' property with value LED_COLOR_ID_RGB\n",
96 np);
97 return 0;
98 }
99
100 led->subled_info[0].color_index = LED_COLOR_ID_RED;
101 led->subled_info[0].channel = 0;
102 led->subled_info[1].color_index = LED_COLOR_ID_GREEN;
103 led->subled_info[1].channel = 1;
104 led->subled_info[2].color_index = LED_COLOR_ID_BLUE;
105 led->subled_info[2].channel = 2;
106
107 led->mc_cdev.subled_info = led->subled_info;
108 led->mc_cdev.num_colors = OMNIA_LED_NUM_CHANNELS;
109
110 init_data.fwnode = &np->fwnode;
111
112 cdev = &led->mc_cdev.led_cdev;
113 cdev->max_brightness = 255;
114 cdev->brightness_set_blocking = omnia_led_brightness_set_blocking;
115
116
117 ret = i2c_smbus_write_byte_data(client, CMD_LED_MODE,
118 CMD_LED_MODE_LED(led->reg) |
119 CMD_LED_MODE_USER);
120 if (ret < 0) {
121 dev_err(dev, "Cannot set LED %pOF to software mode: %i\n", np,
122 ret);
123 return ret;
124 }
125
126
127 ret = i2c_smbus_write_byte_data(client, CMD_LED_STATE,
128 CMD_LED_STATE_LED(led->reg));
129 if (ret < 0) {
130 dev_err(dev, "Cannot set LED %pOF brightness: %i\n", np, ret);
131 return ret;
132 }
133
134 ret = devm_led_classdev_multicolor_register_ext(dev, &led->mc_cdev,
135 &init_data);
136 if (ret < 0) {
137 dev_err(dev, "Cannot register LED %pOF: %i\n", np, ret);
138 return ret;
139 }
140
141 return 1;
142}
143
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154
155static ssize_t brightness_show(struct device *dev, struct device_attribute *a,
156 char *buf)
157{
158 struct i2c_client *client = to_i2c_client(dev);
159 struct omnia_leds *leds = i2c_get_clientdata(client);
160 int ret;
161
162 mutex_lock(&leds->lock);
163 ret = i2c_smbus_read_byte_data(client, CMD_LED_GET_BRIGHTNESS);
164 mutex_unlock(&leds->lock);
165
166 if (ret < 0)
167 return ret;
168
169 return sprintf(buf, "%d\n", ret);
170}
171
172static ssize_t brightness_store(struct device *dev, struct device_attribute *a,
173 const char *buf, size_t count)
174{
175 struct i2c_client *client = to_i2c_client(dev);
176 struct omnia_leds *leds = i2c_get_clientdata(client);
177 unsigned long brightness;
178 int ret;
179
180 if (kstrtoul(buf, 10, &brightness))
181 return -EINVAL;
182
183 if (brightness > 100)
184 return -EINVAL;
185
186 mutex_lock(&leds->lock);
187 ret = i2c_smbus_write_byte_data(client, CMD_LED_SET_BRIGHTNESS,
188 (u8)brightness);
189 mutex_unlock(&leds->lock);
190
191 if (ret < 0)
192 return ret;
193
194 return count;
195}
196static DEVICE_ATTR_RW(brightness);
197
198static struct attribute *omnia_led_controller_attrs[] = {
199 &dev_attr_brightness.attr,
200 NULL,
201};
202ATTRIBUTE_GROUPS(omnia_led_controller);
203
204static int omnia_leds_probe(struct i2c_client *client,
205 const struct i2c_device_id *id)
206{
207 struct device *dev = &client->dev;
208 struct device_node *np = dev_of_node(dev), *child;
209 struct omnia_leds *leds;
210 struct omnia_led *led;
211 int ret, count;
212
213 count = of_get_available_child_count(np);
214 if (!count) {
215 dev_err(dev, "LEDs are not defined in device tree!\n");
216 return -ENODEV;
217 } else if (count > OMNIA_BOARD_LEDS) {
218 dev_err(dev, "Too many LEDs defined in device tree!\n");
219 return -EINVAL;
220 }
221
222 leds = devm_kzalloc(dev, struct_size(leds, leds, count), GFP_KERNEL);
223 if (!leds)
224 return -ENOMEM;
225
226 leds->client = client;
227 i2c_set_clientdata(client, leds);
228
229 mutex_init(&leds->lock);
230
231 led = &leds->leds[0];
232 for_each_available_child_of_node(np, child) {
233 ret = omnia_led_register(client, led, child);
234 if (ret < 0) {
235 of_node_put(child);
236 return ret;
237 }
238
239 led += ret;
240 }
241
242 if (devm_device_add_groups(dev, omnia_led_controller_groups))
243 dev_warn(dev, "Could not add attribute group!\n");
244
245 return 0;
246}
247
248static int omnia_leds_remove(struct i2c_client *client)
249{
250 u8 buf[5];
251
252
253 i2c_smbus_write_byte_data(client, CMD_LED_MODE,
254 CMD_LED_MODE_LED(OMNIA_BOARD_LEDS));
255
256
257 buf[0] = CMD_LED_COLOR;
258 buf[1] = OMNIA_BOARD_LEDS;
259 buf[2] = 255;
260 buf[3] = 255;
261 buf[4] = 255;
262
263 i2c_master_send(client, buf, 5);
264
265 return 0;
266}
267
268static const struct of_device_id of_omnia_leds_match[] = {
269 { .compatible = "cznic,turris-omnia-leds", },
270 {},
271};
272
273static const struct i2c_device_id omnia_id[] = {
274 { "omnia", 0 },
275 { }
276};
277MODULE_DEVICE_TABLE(i2c, omnia_id);
278
279static struct i2c_driver omnia_leds_driver = {
280 .probe = omnia_leds_probe,
281 .remove = omnia_leds_remove,
282 .id_table = omnia_id,
283 .driver = {
284 .name = "leds-turris-omnia",
285 .of_match_table = of_omnia_leds_match,
286 },
287};
288
289module_i2c_driver(omnia_leds_driver);
290
291MODULE_AUTHOR("Marek Behun <kabel@kernel.org>");
292MODULE_DESCRIPTION("CZ.NIC's Turris Omnia LEDs");
293MODULE_LICENSE("GPL v2");
294
