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[mirror_ubuntu-bionic-kernel.git] / drivers / input / mouse / alps.c
CommitLineData
1da177e4
LT		 1/*
2 * ALPS touchpad PS/2 mouse driver
3 *
4 * Copyright (c) 2003 Neil Brown <neilb@cse.unsw.edu.au>
963f626d 5 * Copyright (c) 2003-2005 Peter Osterlund <petero2@telia.com>
1da177e4
LT		 6 * Copyright (c) 2004 Dmitry Torokhov <dtor@mail.ru>
7 * Copyright (c) 2005 Vojtech Pavlik <vojtech@suse.cz>
8 *
9 * ALPS detection, tap switching and status querying info is taken from
10 * tpconfig utility (by C. Scott Ananian and Bruce Kall).
11 *
12 * This program is free software; you can redistribute it and/or modify it
13 * under the terms of the GNU General Public License version 2 as published by
14 * the Free Software Foundation.
15 */
16
17#include <linux/input.h>
18#include <linux/serio.h>
19#include <linux/libps2.h>
20
21#include "psmouse.h"
22#include "alps.h"
23
24#undef DEBUG
25#ifdef DEBUG
26#define dbg(format, arg...) printk(KERN_INFO "alps.c: " format "\n", ## arg)
27#else
28#define dbg(format, arg...) do {} while (0)
29#endif
30
31#define ALPS_DUALPOINT 0x01
32#define ALPS_WHEEL 0x02
c30b4c10 33#define ALPS_FW_BK_1 0x04
1da177e4
LT		 34#define ALPS_4BTN 0x08
35#define ALPS_OLDPROTO 0x10
36#define ALPS_PASS 0x20
c30b4c10 37#define ALPS_FW_BK_2 0x40
1da177e4
LT		 38
39static struct alps_model_info alps_model_data[] = {
40 { { 0x33, 0x02, 0x0a }, 0x88, 0xf8, ALPS_OLDPROTO }, /* UMAX-530T */
41 { { 0x53, 0x02, 0x0a }, 0xf8, 0xf8, 0 },
42 { { 0x53, 0x02, 0x14 }, 0xf8, 0xf8, 0 },
f5e9c9ca 43 { { 0x60, 0x03, 0xc8 }, 0xf8, 0xf8, 0 }, /* HP ze1115 */
1da177e4
LT		 44 { { 0x63, 0x02, 0x0a }, 0xf8, 0xf8, 0 },
45 { { 0x63, 0x02, 0x14 }, 0xf8, 0xf8, 0 },
ea54c96c 46 { { 0x63, 0x02, 0x28 }, 0xf8, 0xf8, ALPS_FW_BK_2 }, /* Fujitsu Siemens S6010 */
1da177e4 47 { { 0x63, 0x02, 0x3c }, 0x8f, 0x8f, ALPS_WHEEL }, /* Toshiba Satellite S2400-103 */
c30b4c10 48 { { 0x63, 0x02, 0x50 }, 0xef, 0xef, ALPS_FW_BK_1 }, /* NEC Versa L320 */
1da177e4
LT		 49 { { 0x63, 0x02, 0x64 }, 0xf8, 0xf8, 0 },
50 { { 0x63, 0x03, 0xc8 }, 0xf8, 0xf8, ALPS_PASS }, /* Dell Latitude D800 */
51 { { 0x73, 0x02, 0x0a }, 0xf8, 0xf8, 0 },
c30b4c10 52 { { 0x73, 0x02, 0x14 }, 0xf8, 0xf8, ALPS_FW_BK_2 }, /* Ahtec Laptop */
1da177e4
LT		 53 { { 0x20, 0x02, 0x0e }, 0xf8, 0xf8, ALPS_PASS | ALPS_DUALPOINT }, /* XXX */
54 { { 0x22, 0x02, 0x0a }, 0xf8, 0xf8, ALPS_PASS | ALPS_DUALPOINT },
55 { { 0x22, 0x02, 0x14 }, 0xff, 0xff, ALPS_PASS | ALPS_DUALPOINT }, /* Dell Latitude D600 */
56};
57
58/*
59 * XXX - this entry is suspicious. First byte has zero lower nibble,
60 * which is what a normal mouse would report. Also, the value 0x0e
61 * isn't valid per PS/2 spec.
62 */
63
64/*
65 * ALPS abolute Mode - new format
968ac842
DT		 66 *
67 * byte 0: 1 ? ? ? 1 ? ? ?
1da177e4
LT		 68 * byte 1: 0 x6 x5 x4 x3 x2 x1 x0
69 * byte 2: 0 x10 x9 x8 x7 ? fin ges
968ac842 70 * byte 3: 0 y9 y8 y7 1 M R L
1da177e4
LT		 71 * byte 4: 0 y6 y5 y4 y3 y2 y1 y0
72 * byte 5: 0 z6 z5 z4 z3 z2 z1 z0
73 *
74 * ?'s can have different meanings on different models,
75 * such as wheel rotation, extra buttons, stick buttons
76 * on a dualpoint, etc.
77 */
78
79static void alps_process_packet(struct psmouse *psmouse, struct pt_regs *regs)
80{
81 struct alps_data *priv = psmouse->private;
82 unsigned char *packet = psmouse->packet;
2e5b636b
DT		 83 struct input_dev *dev = psmouse->dev;
84 struct input_dev *dev2 = priv->dev2;
1da177e4 85 int x, y, z, ges, fin, left, right, middle;
c30b4c10 86 int back = 0, forward = 0;
1da177e4
LT		 87
88 input_regs(dev, regs);
89
90 if ((packet[0] & 0xc8) == 0x08) { /* 3-byte PS/2 packet */
968ac842 91 input_report_key(dev2, BTN_LEFT, packet[0] & 1);
1da177e4
LT		 92 input_report_key(dev2, BTN_RIGHT, packet[0] & 2);
93 input_report_key(dev2, BTN_MIDDLE, packet[0] & 4);
94 input_report_rel(dev2, REL_X,
95 packet[1] ? packet[1] - ((packet[0] << 4) & 0x100) : 0);
96 input_report_rel(dev2, REL_Y,
97 packet[2] ? ((packet[0] << 3) & 0x100) - packet[2] : 0);
98 input_sync(dev2);
99 return;
100 }
101
102 if (priv->i->flags & ALPS_OLDPROTO) {
103 left = packet[2] & 0x08;
104 right = packet[2] & 0x10;
105 middle = 0;
106 x = packet[1] | ((packet[0] & 0x07) << 7);
107 y = packet[4] | ((packet[3] & 0x07) << 7);
108 z = packet[5];
109 } else {
110 left = packet[3] & 1;
111 right = packet[3] & 2;
112 middle = packet[3] & 4;
113 x = packet[1] | ((packet[2] & 0x78) << (7 - 3));
114 y = packet[4] | ((packet[3] & 0x70) << (7 - 4));
115 z = packet[5];
116 }
117
c30b4c10
ICR		 118 if (priv->i->flags & ALPS_FW_BK_1) {
119 back = packet[2] & 4;
120 forward = packet[0] & 0x10;
121 }
122
123 if (priv->i->flags & ALPS_FW_BK_2) {
124 back = packet[3] & 4;
125 forward = packet[2] & 4;
126 if ((middle = forward && back))
127 forward = back = 0;
128 }
129
1da177e4
LT		 130 ges = packet[2] & 1;
131 fin = packet[2] & 2;
132
133 input_report_key(dev, BTN_LEFT, left);
134 input_report_key(dev, BTN_RIGHT, right);
135 input_report_key(dev, BTN_MIDDLE, middle);
136
137 if ((priv->i->flags & ALPS_DUALPOINT) && z == 127) {
138 input_report_rel(dev2, REL_X, (x > 383 ? (x - 768) : x));
139 input_report_rel(dev2, REL_Y, -(y > 255 ? (y - 512) : y));
140 input_sync(dev);
141 input_sync(dev2);
142 return;
143 }
144
145 /* Convert hardware tap to a reasonable Z value */
146 if (ges && !fin) z = 40;
147
148 /*
149 * A "tap and drag" operation is reported by the hardware as a transition
150 * from (!fin && ges) to (fin && ges). This should be translated to the
151 * sequence Z>0, Z==0, Z>0, so the Z==0 event has to be generated manually.
152 */
153 if (ges && fin && !priv->prev_fin) {
154 input_report_abs(dev, ABS_X, x);
155 input_report_abs(dev, ABS_Y, y);
156 input_report_abs(dev, ABS_PRESSURE, 0);
157 input_report_key(dev, BTN_TOOL_FINGER, 0);
158 input_sync(dev);
159 }
160 priv->prev_fin = fin;
161
162 if (z > 30) input_report_key(dev, BTN_TOUCH, 1);
163 if (z < 25) input_report_key(dev, BTN_TOUCH, 0);
164
165 if (z > 0) {
166 input_report_abs(dev, ABS_X, x);
167 input_report_abs(dev, ABS_Y, y);
168 }
169
170 input_report_abs(dev, ABS_PRESSURE, z);
171 input_report_key(dev, BTN_TOOL_FINGER, z > 0);
172
1da177e4 173 if (priv->i->flags & ALPS_WHEEL)
e6c047b9 174 input_report_rel(dev, REL_WHEEL, ((packet[2] << 1) & 0x08) - ((packet[0] >> 4) & 0x07));
1da177e4 175
c30b4c10
ICR		 176 if (priv->i->flags & (ALPS_FW_BK_1 | ALPS_FW_BK_2)) {
177 input_report_key(dev, BTN_FORWARD, forward);
178 input_report_key(dev, BTN_BACK, back);
1da177e4
LT		 179 }
180
181 input_sync(dev);
182}
183
184static psmouse_ret_t alps_process_byte(struct psmouse *psmouse, struct pt_regs *regs)
185{
186 struct alps_data *priv = psmouse->private;
187
188 if ((psmouse->packet[0] & 0xc8) == 0x08) { /* PS/2 packet */
189 if (psmouse->pktcnt == 3) {
190 alps_process_packet(psmouse, regs);
191 return PSMOUSE_FULL_PACKET;
192 }
193 return PSMOUSE_GOOD_DATA;
194 }
195
196 if ((psmouse->packet[0] & priv->i->mask0) != priv->i->byte0)
197 return PSMOUSE_BAD_DATA;
198
199 /* Bytes 2 - 6 should have 0 in the highest bit */
200 if (psmouse->pktcnt >= 2 && psmouse->pktcnt <= 6 &&
201 (psmouse->packet[psmouse->pktcnt - 1] & 0x80))
202 return PSMOUSE_BAD_DATA;
203
204 if (psmouse->pktcnt == 6) {
205 alps_process_packet(psmouse, regs);
206 return PSMOUSE_FULL_PACKET;
207 }
208
209 return PSMOUSE_GOOD_DATA;
210}
211
212static struct alps_model_info *alps_get_model(struct psmouse *psmouse, int *version)
213{
214 struct ps2dev *ps2dev = &psmouse->ps2dev;
215 unsigned char rates[] = { 0, 10, 20, 40, 60, 80, 100, 200 };
216 unsigned char param[4];
217 int i;
218
219 /*
220 * First try "E6 report".
221 * ALPS should return 0,0,10 or 0,0,100
222 */
223 param[0] = 0;
224 if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES) ||
225 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
226 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
227 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11))
228 return NULL;
229
230 param[0] = param[1] = param[2] = 0xff;
231 if (ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO))
232 return NULL;
233
234 dbg("E6 report: %2.2x %2.2x %2.2x", param[0], param[1], param[2]);
235
236 if (param[0] != 0 || param[1] != 0 || (param[2] != 10 && param[2] != 100))
237 return NULL;
238
239 /*
240 * Now try "E7 report". Allowed responses are in
241 * alps_model_data[].signature
242 */
243 param[0] = 0;
244 if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES) ||
245 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE21) ||
246 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE21) ||
247 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE21))
248 return NULL;
249
250 param[0] = param[1] = param[2] = 0xff;
251 if (ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO))
252 return NULL;
253
254 dbg("E7 report: %2.2x %2.2x %2.2x", param[0], param[1], param[2]);
255
256 for (i = 0; i < ARRAY_SIZE(rates) && param[2] != rates[i]; i++);
257 *version = (param[0] << 8) | (param[1] << 4) | i;
258
259 for (i = 0; i < ARRAY_SIZE(alps_model_data); i++)
260 if (!memcmp(param, alps_model_data[i].signature, sizeof(alps_model_data[i].signature)))
261 return alps_model_data + i;
262
263 return NULL;
264}
265
266/*
267 * For DualPoint devices select the device that should respond to
268 * subsequent commands. It looks like glidepad is behind stickpointer,
269 * I'd thought it would be other way around...
270 */
271static int alps_passthrough_mode(struct psmouse *psmouse, int enable)
272{
273 struct ps2dev *ps2dev = &psmouse->ps2dev;
1da177e4
LT		 274 int cmd = enable ? PSMOUSE_CMD_SETSCALE21 : PSMOUSE_CMD_SETSCALE11;
275
276 if (ps2_command(ps2dev, NULL, cmd) ||
277 ps2_command(ps2dev, NULL, cmd) ||
278 ps2_command(ps2dev, NULL, cmd) ||
279 ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE))
280 return -1;
281
282 /* we may get 3 more bytes, just ignore them */
c611763d 283 ps2_drain(ps2dev, 3, 100);
1da177e4
LT		 284
285 return 0;
286}
287
288static int alps_absolute_mode(struct psmouse *psmouse)
289{
290 struct ps2dev *ps2dev = &psmouse->ps2dev;
291
292 /* Try ALPS magic knock - 4 disable before enable */
293 if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
294 ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
295 ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
296 ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
297 ps2_command(ps2dev, NULL, PSMOUSE_CMD_ENABLE))
298 return -1;
299
300 /*
301 * Switch mouse to poll (remote) mode so motion data will not
302 * get in our way
303 */
304 return ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_SETPOLL);
305}
306
307static int alps_get_status(struct psmouse *psmouse, char *param)
308{
309 struct ps2dev *ps2dev = &psmouse->ps2dev;
310
311 /* Get status: 0xF5 0xF5 0xF5 0xE9 */
312 if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
313 ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
314 ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
315 ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO))
316 return -1;
317
318 dbg("Status: %2.2x %2.2x %2.2x", param[0], param[1], param[2]);
319
320 return 0;
321}
322
323/*
324 * Turn touchpad tapping on or off. The sequences are:
325 * 0xE9 0xF5 0xF5 0xF3 0x0A to enable,
326 * 0xE9 0xF5 0xF5 0xE8 0x00 to disable.
327 * My guess that 0xE9 (GetInfo) is here as a sync point.
328 * For models that also have stickpointer (DualPoints) its tapping
329 * is controlled separately (0xE6 0xE6 0xE6 0xF3 0x14|0x0A) but
330 * we don't fiddle with it.
331 */
332static int alps_tap_mode(struct psmouse *psmouse, int enable)
333{
334 struct ps2dev *ps2dev = &psmouse->ps2dev;
335 int cmd = enable ? PSMOUSE_CMD_SETRATE : PSMOUSE_CMD_SETRES;
336 unsigned char tap_arg = enable ? 0x0A : 0x00;
337 unsigned char param[4];
338
339 if (ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO) ||
340 ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
341 ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
342 ps2_command(ps2dev, &tap_arg, cmd))
343 return -1;
344
345 if (alps_get_status(psmouse, param))
346 return -1;
347
348 return 0;
349}
350
f0d5c6f4
DT		 351/*
352 * alps_poll() - poll the touchpad for current motion packet.
353 * Used in resync.
354 */
355static int alps_poll(struct psmouse *psmouse)
356{
357 struct alps_data *priv = psmouse->private;
358 unsigned char buf[6];
359 int poll_failed;
360
361 if (priv->i->flags & ALPS_PASS)
362 alps_passthrough_mode(psmouse, 1);
363
364 poll_failed = ps2_command(&psmouse->ps2dev, buf,
365 PSMOUSE_CMD_POLL | (psmouse->pktsize << 8)) < 0;
366
367 if (priv->i->flags & ALPS_PASS)
368 alps_passthrough_mode(psmouse, 0);
369
370 if (poll_failed || (buf[0] & priv->i->mask0) != priv->i->byte0)
371 return -1;
372
373 if ((psmouse->badbyte & 0xc8) == 0x08) {
374/*
375 * Poll the track stick ...
376 */
377 if (ps2_command(&psmouse->ps2dev, buf, PSMOUSE_CMD_POLL | (3 << 8)))
378 return -1;
379 }
380
381 memcpy(psmouse->packet, buf, sizeof(buf));
382 return 0;
383}
384
1da177e4
LT		 385static int alps_reconnect(struct psmouse *psmouse)
386{
387 struct alps_data *priv = psmouse->private;
1da177e4
LT		 388 int version;
389
f3a5c73d
DT		 390 psmouse_reset(psmouse);
391
1da177e4
LT		 392 if (!(priv->i = alps_get_model(psmouse, &version)))
393 return -1;
394
b30dc120 395 if ((priv->i->flags & ALPS_PASS) && alps_passthrough_mode(psmouse, 1))
1da177e4
LT		 396 return -1;
397
963f626d
PO		 398 if (alps_tap_mode(psmouse, 1)) {
399 printk(KERN_WARNING "alps.c: Failed to reenable hardware tapping\n");
1da177e4 400 return -1;
963f626d 401 }
1da177e4
LT		 402
403 if (alps_absolute_mode(psmouse)) {
963f626d 404 printk(KERN_ERR "alps.c: Failed to reenable absolute mode\n");
1da177e4
LT		 405 return -1;
406 }
407
b30dc120 408 if ((priv->i->flags & ALPS_PASS) && alps_passthrough_mode(psmouse, 0))
1da177e4
LT		 409 return -1;
410
411 return 0;
412}
413
414static void alps_disconnect(struct psmouse *psmouse)
415{
416 struct alps_data *priv = psmouse->private;
2e5b636b 417
1da177e4 418 psmouse_reset(psmouse);
2e5b636b 419 input_unregister_device(priv->dev2);
1da177e4
LT		 420 kfree(priv);
421}
422
423int alps_init(struct psmouse *psmouse)
424{
425 struct alps_data *priv;
2e5b636b 426 struct input_dev *dev1 = psmouse->dev, *dev2;
1da177e4
LT		 427 int version;
428
2e5b636b
DT		 429 psmouse->private = priv = kzalloc(sizeof(struct alps_data), GFP_KERNEL);
430 dev2 = input_allocate_device();
431 if (!priv || !dev2)
1da177e4 432 goto init_fail;
2e5b636b
DT		 433
434 priv->dev2 = dev2;
1da177e4
LT		 435
436 if (!(priv->i = alps_get_model(psmouse, &version)))
437 goto init_fail;
438
439 if ((priv->i->flags & ALPS_PASS) && alps_passthrough_mode(psmouse, 1))
440 goto init_fail;
441
963f626d
PO		 442 if (alps_tap_mode(psmouse, 1))
443 printk(KERN_WARNING "alps.c: Failed to enable hardware tapping\n");
1da177e4
LT		 444
445 if (alps_absolute_mode(psmouse)) {
446 printk(KERN_ERR "alps.c: Failed to enable absolute mode\n");
447 goto init_fail;
448 }
449
450 if ((priv->i->flags & ALPS_PASS) && alps_passthrough_mode(psmouse, 0))
451 goto init_fail;
452
2e5b636b
DT		 453 dev1->evbit[LONG(EV_KEY)] |= BIT(EV_KEY);
454 dev1->keybit[LONG(BTN_TOUCH)] |= BIT(BTN_TOUCH);
455 dev1->keybit[LONG(BTN_TOOL_FINGER)] |= BIT(BTN_TOOL_FINGER);
456 dev1->keybit[LONG(BTN_LEFT)] |= BIT(BTN_LEFT) | BIT(BTN_MIDDLE) | BIT(BTN_RIGHT);
1da177e4 457
2e5b636b
DT		 458 dev1->evbit[LONG(EV_ABS)] |= BIT(EV_ABS);
459 input_set_abs_params(dev1, ABS_X, 0, 1023, 0, 0);
460 input_set_abs_params(dev1, ABS_Y, 0, 767, 0, 0);
461 input_set_abs_params(dev1, ABS_PRESSURE, 0, 127, 0, 0);
1da177e4
LT		 462
463 if (priv->i->flags & ALPS_WHEEL) {
2e5b636b
DT		 464 dev1->evbit[LONG(EV_REL)] |= BIT(EV_REL);
465 dev1->relbit[LONG(REL_WHEEL)] |= BIT(REL_WHEEL);
1da177e4
LT		 466 }
467
c30b4c10 468 if (priv->i->flags & (ALPS_FW_BK_1 | ALPS_FW_BK_2)) {
2e5b636b
DT		 469 dev1->keybit[LONG(BTN_FORWARD)] |= BIT(BTN_FORWARD);
470 dev1->keybit[LONG(BTN_BACK)] |= BIT(BTN_BACK);
1da177e4
LT		 471 }
472
473 sprintf(priv->phys, "%s/input1", psmouse->ps2dev.serio->phys);
2e5b636b
DT		 474 dev2->phys = priv->phys;
475 dev2->name = (priv->i->flags & ALPS_DUALPOINT) ? "DualPoint Stick" : "PS/2 Mouse";
476 dev2->id.bustype = BUS_I8042;
477 dev2->id.vendor = 0x0002;
478 dev2->id.product = PSMOUSE_ALPS;
479 dev2->id.version = 0x0000;
1da177e4 480
2e5b636b
DT		 481 dev2->evbit[0] = BIT(EV_KEY) | BIT(EV_REL);
482 dev2->relbit[LONG(REL_X)] |= BIT(REL_X) | BIT(REL_Y);
483 dev2->keybit[LONG(BTN_LEFT)] |= BIT(BTN_LEFT) | BIT(BTN_MIDDLE) | BIT(BTN_RIGHT);
1da177e4 484
2e5b636b 485 input_register_device(priv->dev2);
1da177e4
LT		 486
487 psmouse->protocol_handler = alps_process_byte;
f0d5c6f4 488 psmouse->poll = alps_poll;
1da177e4
LT		 489 psmouse->disconnect = alps_disconnect;
490 psmouse->reconnect = alps_reconnect;
491 psmouse->pktsize = 6;
492
f0d5c6f4
DT		 493 /* We are having trouble resyncing ALPS touchpads so disable it for now */
494 psmouse->resync_time = 0;
495
1da177e4
LT		 496 return 0;
497
498init_fail:
2e5b636b 499 input_free_device(dev2);
1da177e4
LT		 500 kfree(priv);
501 return -1;
502}
503
504int alps_detect(struct psmouse *psmouse, int set_properties)
505{
506 int version;
968ac842 507 struct alps_model_info *model;
1da177e4
LT		 508
509 if (!(model = alps_get_model(psmouse, &version)))
510 return -1;
511
512 if (set_properties) {
513 psmouse->vendor = "ALPS";
968ac842
DT		 514 psmouse->name = model->flags & ALPS_DUALPOINT ?
515 "DualPoint TouchPad" : "GlidePoint";
1da177e4
LT		 516 psmouse->model = version;
517 }
518 return 0;
519}
520
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