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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
7a8685ac DM |
2 | /* |
3 | * TI LP8860 4-Channel LED Driver | |
4 | * | |
5 | * Copyright (C) 2014 Texas Instruments | |
6 | * | |
7 | * Author: Dan Murphy <dmurphy@ti.com> | |
7a8685ac DM |
8 | */ |
9 | ||
10 | #include <linux/i2c.h> | |
11 | #include <linux/init.h> | |
12 | #include <linux/leds.h> | |
13 | #include <linux/regmap.h> | |
14 | #include <linux/regulator/consumer.h> | |
15 | #include <linux/module.h> | |
16 | #include <linux/mutex.h> | |
17 | #include <linux/of.h> | |
18 | #include <linux/of_gpio.h> | |
19 | #include <linux/gpio/consumer.h> | |
20 | #include <linux/slab.h> | |
21 | ||
22 | #define LP8860_DISP_CL1_BRT_MSB 0x00 | |
23 | #define LP8860_DISP_CL1_BRT_LSB 0x01 | |
24 | #define LP8860_DISP_CL1_CURR_MSB 0x02 | |
25 | #define LP8860_DISP_CL1_CURR_LSB 0x03 | |
26 | #define LP8860_CL2_BRT_MSB 0x04 | |
27 | #define LP8860_CL2_BRT_LSB 0x05 | |
28 | #define LP8860_CL2_CURRENT 0x06 | |
29 | #define LP8860_CL3_BRT_MSB 0x07 | |
30 | #define LP8860_CL3_BRT_LSB 0x08 | |
31 | #define LP8860_CL3_CURRENT 0x09 | |
32 | #define LP8860_CL4_BRT_MSB 0x0a | |
33 | #define LP8860_CL4_BRT_LSB 0x0b | |
34 | #define LP8860_CL4_CURRENT 0x0c | |
35 | #define LP8860_CONFIG 0x0d | |
36 | #define LP8860_STATUS 0x0e | |
37 | #define LP8860_FAULT 0x0f | |
38 | #define LP8860_LED_FAULT 0x10 | |
39 | #define LP8860_FAULT_CLEAR 0x11 | |
40 | #define LP8860_ID 0x12 | |
41 | #define LP8860_TEMP_MSB 0x13 | |
42 | #define LP8860_TEMP_LSB 0x14 | |
43 | #define LP8860_DISP_LED_CURR_MSB 0x15 | |
44 | #define LP8860_DISP_LED_CURR_LSB 0x16 | |
45 | #define LP8860_DISP_LED_PWM_MSB 0x17 | |
46 | #define LP8860_DISP_LED_PWM_LSB 0x18 | |
47 | #define LP8860_EEPROM_CNTRL 0x19 | |
48 | #define LP8860_EEPROM_UNLOCK 0x1a | |
49 | ||
50 | #define LP8860_EEPROM_REG_0 0x60 | |
51 | #define LP8860_EEPROM_REG_1 0x61 | |
52 | #define LP8860_EEPROM_REG_2 0x62 | |
53 | #define LP8860_EEPROM_REG_3 0x63 | |
54 | #define LP8860_EEPROM_REG_4 0x64 | |
55 | #define LP8860_EEPROM_REG_5 0x65 | |
56 | #define LP8860_EEPROM_REG_6 0x66 | |
57 | #define LP8860_EEPROM_REG_7 0x67 | |
58 | #define LP8860_EEPROM_REG_8 0x68 | |
59 | #define LP8860_EEPROM_REG_9 0x69 | |
60 | #define LP8860_EEPROM_REG_10 0x6a | |
61 | #define LP8860_EEPROM_REG_11 0x6b | |
62 | #define LP8860_EEPROM_REG_12 0x6c | |
63 | #define LP8860_EEPROM_REG_13 0x6d | |
64 | #define LP8860_EEPROM_REG_14 0x6e | |
65 | #define LP8860_EEPROM_REG_15 0x6f | |
66 | #define LP8860_EEPROM_REG_16 0x70 | |
67 | #define LP8860_EEPROM_REG_17 0x71 | |
68 | #define LP8860_EEPROM_REG_18 0x72 | |
69 | #define LP8860_EEPROM_REG_19 0x73 | |
70 | #define LP8860_EEPROM_REG_20 0x74 | |
71 | #define LP8860_EEPROM_REG_21 0x75 | |
72 | #define LP8860_EEPROM_REG_22 0x76 | |
73 | #define LP8860_EEPROM_REG_23 0x77 | |
74 | #define LP8860_EEPROM_REG_24 0x78 | |
75 | ||
76 | #define LP8860_LOCK_EEPROM 0x00 | |
77 | #define LP8860_UNLOCK_EEPROM 0x01 | |
78 | #define LP8860_PROGRAM_EEPROM 0x02 | |
79 | #define LP8860_EEPROM_CODE_1 0x08 | |
80 | #define LP8860_EEPROM_CODE_2 0xba | |
81 | #define LP8860_EEPROM_CODE_3 0xef | |
82 | ||
83 | #define LP8860_CLEAR_FAULTS 0x01 | |
84 | ||
99ca0ea5 JA |
85 | #define LP8860_NAME "lp8860" |
86 | ||
7a8685ac DM |
87 | /** |
88 | * struct lp8860_led - | |
89 | * @lock - Lock for reading/writing the device | |
7a8685ac DM |
90 | * @client - Pointer to the I2C client |
91 | * @led_dev - led class device pointer | |
92 | * @regmap - Devices register map | |
93 | * @eeprom_regmap - EEPROM register map | |
94 | * @enable_gpio - VDDIO/EN gpio to enable communication interface | |
95 | * @regulator - LED supply regulator pointer | |
8a7a76c8 | 96 | */ |
7a8685ac DM |
97 | struct lp8860_led { |
98 | struct mutex lock; | |
7a8685ac DM |
99 | struct i2c_client *client; |
100 | struct led_classdev led_dev; | |
101 | struct regmap *regmap; | |
102 | struct regmap *eeprom_regmap; | |
103 | struct gpio_desc *enable_gpio; | |
104 | struct regulator *regulator; | |
7a8685ac DM |
105 | }; |
106 | ||
107 | struct lp8860_eeprom_reg { | |
108 | uint8_t reg; | |
109 | uint8_t value; | |
110 | }; | |
111 | ||
112 | static struct lp8860_eeprom_reg lp8860_eeprom_disp_regs[] = { | |
113 | { LP8860_EEPROM_REG_0, 0xed }, | |
114 | { LP8860_EEPROM_REG_1, 0xdf }, | |
115 | { LP8860_EEPROM_REG_2, 0xdc }, | |
116 | { LP8860_EEPROM_REG_3, 0xf0 }, | |
117 | { LP8860_EEPROM_REG_4, 0xdf }, | |
118 | { LP8860_EEPROM_REG_5, 0xe5 }, | |
119 | { LP8860_EEPROM_REG_6, 0xf2 }, | |
120 | { LP8860_EEPROM_REG_7, 0x77 }, | |
121 | { LP8860_EEPROM_REG_8, 0x77 }, | |
122 | { LP8860_EEPROM_REG_9, 0x71 }, | |
123 | { LP8860_EEPROM_REG_10, 0x3f }, | |
124 | { LP8860_EEPROM_REG_11, 0xb7 }, | |
125 | { LP8860_EEPROM_REG_12, 0x17 }, | |
126 | { LP8860_EEPROM_REG_13, 0xef }, | |
127 | { LP8860_EEPROM_REG_14, 0xb0 }, | |
128 | { LP8860_EEPROM_REG_15, 0x87 }, | |
129 | { LP8860_EEPROM_REG_16, 0xce }, | |
130 | { LP8860_EEPROM_REG_17, 0x72 }, | |
131 | { LP8860_EEPROM_REG_18, 0xe5 }, | |
132 | { LP8860_EEPROM_REG_19, 0xdf }, | |
133 | { LP8860_EEPROM_REG_20, 0x35 }, | |
134 | { LP8860_EEPROM_REG_21, 0x06 }, | |
135 | { LP8860_EEPROM_REG_22, 0xdc }, | |
136 | { LP8860_EEPROM_REG_23, 0x88 }, | |
137 | { LP8860_EEPROM_REG_24, 0x3E }, | |
138 | }; | |
139 | ||
140 | static int lp8860_unlock_eeprom(struct lp8860_led *led, int lock) | |
141 | { | |
142 | int ret; | |
143 | ||
144 | mutex_lock(&led->lock); | |
145 | ||
146 | if (lock == LP8860_UNLOCK_EEPROM) { | |
147 | ret = regmap_write(led->regmap, | |
148 | LP8860_EEPROM_UNLOCK, | |
149 | LP8860_EEPROM_CODE_1); | |
150 | if (ret) { | |
151 | dev_err(&led->client->dev, "EEPROM Unlock failed\n"); | |
152 | goto out; | |
153 | } | |
154 | ||
155 | ret = regmap_write(led->regmap, | |
156 | LP8860_EEPROM_UNLOCK, | |
157 | LP8860_EEPROM_CODE_2); | |
158 | if (ret) { | |
159 | dev_err(&led->client->dev, "EEPROM Unlock failed\n"); | |
160 | goto out; | |
161 | } | |
162 | ret = regmap_write(led->regmap, | |
163 | LP8860_EEPROM_UNLOCK, | |
164 | LP8860_EEPROM_CODE_3); | |
165 | if (ret) { | |
166 | dev_err(&led->client->dev, "EEPROM Unlock failed\n"); | |
167 | goto out; | |
168 | } | |
169 | } else { | |
170 | ret = regmap_write(led->regmap, | |
171 | LP8860_EEPROM_UNLOCK, | |
172 | LP8860_LOCK_EEPROM); | |
173 | } | |
174 | ||
175 | out: | |
176 | mutex_unlock(&led->lock); | |
177 | return ret; | |
178 | } | |
179 | ||
180 | static int lp8860_fault_check(struct lp8860_led *led) | |
181 | { | |
182 | int ret, fault; | |
183 | unsigned int read_buf; | |
184 | ||
185 | ret = regmap_read(led->regmap, LP8860_LED_FAULT, &read_buf); | |
186 | if (ret) | |
187 | goto out; | |
188 | ||
189 | fault = read_buf; | |
190 | ||
191 | ret = regmap_read(led->regmap, LP8860_FAULT, &read_buf); | |
192 | if (ret) | |
193 | goto out; | |
194 | ||
195 | fault |= read_buf; | |
196 | ||
197 | /* Attempt to clear any faults */ | |
198 | if (fault) | |
199 | ret = regmap_write(led->regmap, LP8860_FAULT_CLEAR, | |
200 | LP8860_CLEAR_FAULTS); | |
201 | out: | |
202 | return ret; | |
203 | } | |
204 | ||
7c4b10a2 AL |
205 | static int lp8860_brightness_set(struct led_classdev *led_cdev, |
206 | enum led_brightness brt_val) | |
7a8685ac | 207 | { |
7c4b10a2 AL |
208 | struct lp8860_led *led = |
209 | container_of(led_cdev, struct lp8860_led, led_dev); | |
210 | int disp_brightness = brt_val * 255; | |
7a8685ac | 211 | int ret; |
7a8685ac DM |
212 | |
213 | mutex_lock(&led->lock); | |
214 | ||
215 | ret = lp8860_fault_check(led); | |
216 | if (ret) { | |
217 | dev_err(&led->client->dev, "Cannot read/clear faults\n"); | |
218 | goto out; | |
219 | } | |
220 | ||
221 | ret = regmap_write(led->regmap, LP8860_DISP_CL1_BRT_MSB, | |
222 | (disp_brightness & 0xff00) >> 8); | |
223 | if (ret) { | |
224 | dev_err(&led->client->dev, "Cannot write CL1 MSB\n"); | |
225 | goto out; | |
226 | } | |
227 | ||
228 | ret = regmap_write(led->regmap, LP8860_DISP_CL1_BRT_LSB, | |
229 | disp_brightness & 0xff); | |
230 | if (ret) { | |
231 | dev_err(&led->client->dev, "Cannot write CL1 LSB\n"); | |
232 | goto out; | |
233 | } | |
234 | out: | |
235 | mutex_unlock(&led->lock); | |
7c4b10a2 | 236 | return ret; |
7a8685ac DM |
237 | } |
238 | ||
239 | static int lp8860_init(struct lp8860_led *led) | |
240 | { | |
241 | unsigned int read_buf; | |
242 | int ret, i, reg_count; | |
243 | ||
b12ef03a DM |
244 | if (led->regulator) { |
245 | ret = regulator_enable(led->regulator); | |
246 | if (ret) { | |
247 | dev_err(&led->client->dev, | |
248 | "Failed to enable regulator\n"); | |
249 | return ret; | |
250 | } | |
251 | } | |
252 | ||
7a8685ac DM |
253 | if (led->enable_gpio) |
254 | gpiod_direction_output(led->enable_gpio, 1); | |
255 | ||
256 | ret = lp8860_fault_check(led); | |
257 | if (ret) | |
258 | goto out; | |
259 | ||
260 | ret = regmap_read(led->regmap, LP8860_STATUS, &read_buf); | |
261 | if (ret) | |
262 | goto out; | |
263 | ||
264 | ret = lp8860_unlock_eeprom(led, LP8860_UNLOCK_EEPROM); | |
265 | if (ret) { | |
266 | dev_err(&led->client->dev, "Failed unlocking EEPROM\n"); | |
267 | goto out; | |
268 | } | |
269 | ||
270 | reg_count = ARRAY_SIZE(lp8860_eeprom_disp_regs) / sizeof(lp8860_eeprom_disp_regs[0]); | |
271 | for (i = 0; i < reg_count; i++) { | |
272 | ret = regmap_write(led->eeprom_regmap, | |
273 | lp8860_eeprom_disp_regs[i].reg, | |
274 | lp8860_eeprom_disp_regs[i].value); | |
275 | if (ret) { | |
276 | dev_err(&led->client->dev, "Failed writing EEPROM\n"); | |
277 | goto out; | |
278 | } | |
279 | } | |
280 | ||
281 | ret = lp8860_unlock_eeprom(led, LP8860_LOCK_EEPROM); | |
282 | if (ret) | |
283 | goto out; | |
284 | ||
285 | ret = regmap_write(led->regmap, | |
286 | LP8860_EEPROM_CNTRL, | |
287 | LP8860_PROGRAM_EEPROM); | |
b12ef03a | 288 | if (ret) { |
7a8685ac | 289 | dev_err(&led->client->dev, "Failed programming EEPROM\n"); |
b12ef03a DM |
290 | goto out; |
291 | } | |
292 | ||
293 | return ret; | |
294 | ||
7a8685ac DM |
295 | out: |
296 | if (ret) | |
297 | if (led->enable_gpio) | |
298 | gpiod_direction_output(led->enable_gpio, 0); | |
b12ef03a DM |
299 | |
300 | if (led->regulator) { | |
301 | ret = regulator_disable(led->regulator); | |
302 | if (ret) | |
303 | dev_err(&led->client->dev, | |
304 | "Failed to disable regulator\n"); | |
305 | } | |
306 | ||
7a8685ac DM |
307 | return ret; |
308 | } | |
309 | ||
de88e71a | 310 | static const struct reg_default lp8860_reg_defs[] = { |
7a8685ac DM |
311 | { LP8860_DISP_CL1_BRT_MSB, 0x00}, |
312 | { LP8860_DISP_CL1_BRT_LSB, 0x00}, | |
313 | { LP8860_DISP_CL1_CURR_MSB, 0x00}, | |
314 | { LP8860_DISP_CL1_CURR_LSB, 0x00}, | |
315 | { LP8860_CL2_BRT_MSB, 0x00}, | |
316 | { LP8860_CL2_BRT_LSB, 0x00}, | |
317 | { LP8860_CL2_CURRENT, 0x00}, | |
318 | { LP8860_CL3_BRT_MSB, 0x00}, | |
319 | { LP8860_CL3_BRT_LSB, 0x00}, | |
320 | { LP8860_CL3_CURRENT, 0x00}, | |
321 | { LP8860_CL4_BRT_MSB, 0x00}, | |
322 | { LP8860_CL4_BRT_LSB, 0x00}, | |
323 | { LP8860_CL4_CURRENT, 0x00}, | |
324 | { LP8860_CONFIG, 0x00}, | |
325 | { LP8860_FAULT_CLEAR, 0x00}, | |
326 | { LP8860_EEPROM_CNTRL, 0x80}, | |
327 | { LP8860_EEPROM_UNLOCK, 0x00}, | |
328 | }; | |
329 | ||
330 | static const struct regmap_config lp8860_regmap_config = { | |
331 | .reg_bits = 8, | |
332 | .val_bits = 8, | |
333 | ||
334 | .max_register = LP8860_EEPROM_UNLOCK, | |
335 | .reg_defaults = lp8860_reg_defs, | |
336 | .num_reg_defaults = ARRAY_SIZE(lp8860_reg_defs), | |
337 | .cache_type = REGCACHE_NONE, | |
338 | }; | |
339 | ||
de88e71a | 340 | static const struct reg_default lp8860_eeprom_defs[] = { |
7a8685ac DM |
341 | { LP8860_EEPROM_REG_0, 0x00 }, |
342 | { LP8860_EEPROM_REG_1, 0x00 }, | |
343 | { LP8860_EEPROM_REG_2, 0x00 }, | |
344 | { LP8860_EEPROM_REG_3, 0x00 }, | |
345 | { LP8860_EEPROM_REG_4, 0x00 }, | |
346 | { LP8860_EEPROM_REG_5, 0x00 }, | |
347 | { LP8860_EEPROM_REG_6, 0x00 }, | |
348 | { LP8860_EEPROM_REG_7, 0x00 }, | |
349 | { LP8860_EEPROM_REG_8, 0x00 }, | |
350 | { LP8860_EEPROM_REG_9, 0x00 }, | |
351 | { LP8860_EEPROM_REG_10, 0x00 }, | |
352 | { LP8860_EEPROM_REG_11, 0x00 }, | |
353 | { LP8860_EEPROM_REG_12, 0x00 }, | |
354 | { LP8860_EEPROM_REG_13, 0x00 }, | |
355 | { LP8860_EEPROM_REG_14, 0x00 }, | |
356 | { LP8860_EEPROM_REG_15, 0x00 }, | |
357 | { LP8860_EEPROM_REG_16, 0x00 }, | |
358 | { LP8860_EEPROM_REG_17, 0x00 }, | |
359 | { LP8860_EEPROM_REG_18, 0x00 }, | |
360 | { LP8860_EEPROM_REG_19, 0x00 }, | |
361 | { LP8860_EEPROM_REG_20, 0x00 }, | |
362 | { LP8860_EEPROM_REG_21, 0x00 }, | |
363 | { LP8860_EEPROM_REG_22, 0x00 }, | |
364 | { LP8860_EEPROM_REG_23, 0x00 }, | |
365 | { LP8860_EEPROM_REG_24, 0x00 }, | |
366 | }; | |
367 | ||
368 | static const struct regmap_config lp8860_eeprom_regmap_config = { | |
369 | .reg_bits = 8, | |
370 | .val_bits = 8, | |
371 | ||
372 | .max_register = LP8860_EEPROM_REG_24, | |
373 | .reg_defaults = lp8860_eeprom_defs, | |
374 | .num_reg_defaults = ARRAY_SIZE(lp8860_eeprom_defs), | |
375 | .cache_type = REGCACHE_NONE, | |
376 | }; | |
377 | ||
378 | static int lp8860_probe(struct i2c_client *client, | |
379 | const struct i2c_device_id *id) | |
380 | { | |
381 | int ret; | |
382 | struct lp8860_led *led; | |
383 | struct device_node *np = client->dev.of_node; | |
c6b218c9 | 384 | struct device_node *child_node; |
99ca0ea5 | 385 | struct led_init_data init_data = {}; |
7a8685ac DM |
386 | |
387 | led = devm_kzalloc(&client->dev, sizeof(*led), GFP_KERNEL); | |
388 | if (!led) | |
389 | return -ENOMEM; | |
390 | ||
99ca0ea5 JA |
391 | child_node = of_get_next_available_child(np, NULL); |
392 | if (!child_node) | |
393 | return -EINVAL; | |
394 | ||
395 | led->led_dev.default_trigger = of_get_property(child_node, | |
396 | "linux,default-trigger", | |
397 | NULL); | |
7a8685ac | 398 | |
eb2294c3 UKK |
399 | led->enable_gpio = devm_gpiod_get_optional(&client->dev, |
400 | "enable", GPIOD_OUT_LOW); | |
401 | if (IS_ERR(led->enable_gpio)) { | |
402 | ret = PTR_ERR(led->enable_gpio); | |
403 | dev_err(&client->dev, "Failed to get enable gpio: %d\n", ret); | |
404 | return ret; | |
405 | } | |
7a8685ac DM |
406 | |
407 | led->regulator = devm_regulator_get(&client->dev, "vled"); | |
408 | if (IS_ERR(led->regulator)) | |
409 | led->regulator = NULL; | |
410 | ||
411 | led->client = client; | |
7c4b10a2 | 412 | led->led_dev.brightness_set_blocking = lp8860_brightness_set; |
7a8685ac DM |
413 | |
414 | mutex_init(&led->lock); | |
7a8685ac DM |
415 | |
416 | i2c_set_clientdata(client, led); | |
417 | ||
418 | led->regmap = devm_regmap_init_i2c(client, &lp8860_regmap_config); | |
419 | if (IS_ERR(led->regmap)) { | |
420 | ret = PTR_ERR(led->regmap); | |
421 | dev_err(&client->dev, "Failed to allocate register map: %d\n", | |
422 | ret); | |
423 | return ret; | |
424 | } | |
425 | ||
426 | led->eeprom_regmap = devm_regmap_init_i2c(client, &lp8860_eeprom_regmap_config); | |
427 | if (IS_ERR(led->eeprom_regmap)) { | |
428 | ret = PTR_ERR(led->eeprom_regmap); | |
429 | dev_err(&client->dev, "Failed to allocate register map: %d\n", | |
430 | ret); | |
431 | return ret; | |
432 | } | |
433 | ||
434 | ret = lp8860_init(led); | |
435 | if (ret) | |
436 | return ret; | |
437 | ||
99ca0ea5 JA |
438 | init_data.fwnode = of_fwnode_handle(child_node); |
439 | init_data.devicename = LP8860_NAME; | |
440 | init_data.default_label = ":display_cluster"; | |
441 | ||
442 | ret = devm_led_classdev_register_ext(&client->dev, &led->led_dev, | |
443 | &init_data); | |
7a8685ac DM |
444 | if (ret) { |
445 | dev_err(&client->dev, "led register err: %d\n", ret); | |
446 | return ret; | |
447 | } | |
448 | ||
449 | return 0; | |
450 | } | |
451 | ||
452 | static int lp8860_remove(struct i2c_client *client) | |
453 | { | |
454 | struct lp8860_led *led = i2c_get_clientdata(client); | |
455 | int ret; | |
456 | ||
7a8685ac DM |
457 | if (led->enable_gpio) |
458 | gpiod_direction_output(led->enable_gpio, 0); | |
459 | ||
460 | if (led->regulator) { | |
461 | ret = regulator_disable(led->regulator); | |
462 | if (ret) | |
463 | dev_err(&led->client->dev, | |
464 | "Failed to disable regulator\n"); | |
465 | } | |
466 | ||
a2169c9b DM |
467 | mutex_destroy(&led->lock); |
468 | ||
7a8685ac DM |
469 | return 0; |
470 | } | |
471 | ||
472 | static const struct i2c_device_id lp8860_id[] = { | |
473 | { "lp8860", 0 }, | |
474 | { } | |
475 | }; | |
476 | MODULE_DEVICE_TABLE(i2c, lp8860_id); | |
477 | ||
7a8685ac DM |
478 | static const struct of_device_id of_lp8860_leds_match[] = { |
479 | { .compatible = "ti,lp8860", }, | |
480 | {}, | |
481 | }; | |
482 | MODULE_DEVICE_TABLE(of, of_lp8860_leds_match); | |
7a8685ac DM |
483 | |
484 | static struct i2c_driver lp8860_driver = { | |
485 | .driver = { | |
486 | .name = "lp8860", | |
a2169c9b | 487 | .of_match_table = of_lp8860_leds_match, |
7a8685ac DM |
488 | }, |
489 | .probe = lp8860_probe, | |
490 | .remove = lp8860_remove, | |
491 | .id_table = lp8860_id, | |
492 | }; | |
493 | module_i2c_driver(lp8860_driver); | |
494 | ||
5ee047fb | 495 | MODULE_DESCRIPTION("Texas Instruments LP8860 LED driver"); |
7a8685ac | 496 | MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com>"); |
a2169c9b | 497 | MODULE_LICENSE("GPL v2"); |