1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* |
3 | * Prolific PL2303 USB to serial adaptor driver |
4 | * |
5 | * Copyright (C) 2001-2007 Greg Kroah-Hartman (greg@kroah.com) |
6 | * Copyright (C) 2003 IBM Corp. |
7 | * |
8 | * Original driver for 2.2.x by anonymous |
9 | * |
10 | * See Documentation/usb/usb-serial.rst for more information on using this |
11 | * driver |
12 | */ |
13 | |
14 | #include <linux/kernel.h> |
15 | #include <linux/errno.h> |
16 | #include <linux/slab.h> |
17 | #include <linux/tty.h> |
18 | #include <linux/tty_driver.h> |
19 | #include <linux/tty_flip.h> |
20 | #include <linux/serial.h> |
21 | #include <linux/module.h> |
22 | #include <linux/moduleparam.h> |
23 | #include <linux/spinlock.h> |
24 | #include <linux/uaccess.h> |
25 | #include <linux/usb.h> |
26 | #include <linux/usb/serial.h> |
27 | #include <asm/unaligned.h> |
28 | #include "pl2303.h" |
29 | |
30 | |
31 | #define PL2303_QUIRK_UART_STATE_IDX0 BIT(0) |
32 | #define PL2303_QUIRK_LEGACY BIT(1) |
33 | #define PL2303_QUIRK_ENDPOINT_HACK BIT(2) |
34 | |
35 | static const struct usb_device_id id_table[] = { |
36 | { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID), |
37 | .driver_info = PL2303_QUIRK_ENDPOINT_HACK }, |
38 | { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ2) }, |
39 | { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_DCU11) }, |
40 | { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ3) }, |
41 | { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_CHILITAG) }, |
42 | { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_PHAROS) }, |
43 | { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_ALDIGA) }, |
44 | { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_MMX) }, |
45 | { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GPRS) }, |
46 | { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_HCR331) }, |
47 | { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_MOTOROLA) }, |
48 | { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_ZTEK) }, |
49 | { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_TB) }, |
50 | { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GC) }, |
51 | { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GB) }, |
52 | { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GT) }, |
53 | { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GL) }, |
54 | { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GE) }, |
55 | { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GS) }, |
56 | { USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID) }, |
57 | { USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID_RSAQ5) }, |
58 | { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_ID), |
59 | .driver_info = PL2303_QUIRK_ENDPOINT_HACK }, |
60 | { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_UC485), |
61 | .driver_info = PL2303_QUIRK_ENDPOINT_HACK }, |
62 | { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_UC232B), |
63 | .driver_info = PL2303_QUIRK_ENDPOINT_HACK }, |
64 | { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_ID2) }, |
65 | { USB_DEVICE(ATEN_VENDOR_ID2, ATEN_PRODUCT_ID) }, |
66 | { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID) }, |
67 | { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID_UCSGT) }, |
68 | { USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID) }, |
69 | { USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID_2080) }, |
70 | { USB_DEVICE(MA620_VENDOR_ID, MA620_PRODUCT_ID) }, |
71 | { USB_DEVICE(RATOC_VENDOR_ID, RATOC_PRODUCT_ID) }, |
72 | { USB_DEVICE(TRIPP_VENDOR_ID, TRIPP_PRODUCT_ID) }, |
73 | { USB_DEVICE(RADIOSHACK_VENDOR_ID, RADIOSHACK_PRODUCT_ID) }, |
74 | { USB_DEVICE(DCU10_VENDOR_ID, DCU10_PRODUCT_ID) }, |
75 | { USB_DEVICE(SITECOM_VENDOR_ID, SITECOM_PRODUCT_ID) }, |
76 | { USB_DEVICE(ALCATEL_VENDOR_ID, ALCATEL_PRODUCT_ID) }, |
77 | { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_SX1), |
78 | .driver_info = PL2303_QUIRK_UART_STATE_IDX0 }, |
79 | { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X65), |
80 | .driver_info = PL2303_QUIRK_UART_STATE_IDX0 }, |
81 | { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X75), |
82 | .driver_info = PL2303_QUIRK_UART_STATE_IDX0 }, |
83 | { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_EF81), |
84 | .driver_info = PL2303_QUIRK_ENDPOINT_HACK }, |
85 | { USB_DEVICE(BENQ_VENDOR_ID, BENQ_PRODUCT_ID_S81) }, /* Benq/Siemens S81 */ |
86 | { USB_DEVICE(SYNTECH_VENDOR_ID, SYNTECH_PRODUCT_ID) }, |
87 | { USB_DEVICE(NOKIA_CA42_VENDOR_ID, NOKIA_CA42_PRODUCT_ID) }, |
88 | { USB_DEVICE(CA_42_CA42_VENDOR_ID, CA_42_CA42_PRODUCT_ID) }, |
89 | { USB_DEVICE(SAGEM_VENDOR_ID, SAGEM_PRODUCT_ID) }, |
90 | { USB_DEVICE(LEADTEK_VENDOR_ID, LEADTEK_9531_PRODUCT_ID) }, |
91 | { USB_DEVICE(SPEEDDRAGON_VENDOR_ID, SPEEDDRAGON_PRODUCT_ID) }, |
92 | { USB_DEVICE(DATAPILOT_U2_VENDOR_ID, DATAPILOT_U2_PRODUCT_ID) }, |
93 | { USB_DEVICE(BELKIN_VENDOR_ID, BELKIN_PRODUCT_ID) }, |
94 | { USB_DEVICE(ALCOR_VENDOR_ID, ALCOR_PRODUCT_ID), |
95 | .driver_info = PL2303_QUIRK_ENDPOINT_HACK }, |
96 | { USB_DEVICE(WS002IN_VENDOR_ID, WS002IN_PRODUCT_ID) }, |
97 | { USB_DEVICE(COREGA_VENDOR_ID, COREGA_PRODUCT_ID) }, |
98 | { USB_DEVICE(YCCABLE_VENDOR_ID, YCCABLE_PRODUCT_ID) }, |
99 | { USB_DEVICE(SUPERIAL_VENDOR_ID, SUPERIAL_PRODUCT_ID) }, |
100 | { USB_DEVICE(HP_VENDOR_ID, HP_LD220_PRODUCT_ID) }, |
101 | { USB_DEVICE(HP_VENDOR_ID, HP_LD220TA_PRODUCT_ID) }, |
102 | { USB_DEVICE(HP_VENDOR_ID, HP_LD381_PRODUCT_ID) }, |
103 | { USB_DEVICE(HP_VENDOR_ID, HP_LD381GC_PRODUCT_ID) }, |
104 | { USB_DEVICE(HP_VENDOR_ID, HP_LD960_PRODUCT_ID) }, |
105 | { USB_DEVICE(HP_VENDOR_ID, HP_LD960TA_PRODUCT_ID) }, |
106 | { USB_DEVICE(HP_VENDOR_ID, HP_LCM220_PRODUCT_ID) }, |
107 | { USB_DEVICE(HP_VENDOR_ID, HP_LCM960_PRODUCT_ID) }, |
108 | { USB_DEVICE(HP_VENDOR_ID, HP_LM920_PRODUCT_ID) }, |
109 | { USB_DEVICE(HP_VENDOR_ID, HP_LM930_PRODUCT_ID) }, |
110 | { USB_DEVICE(HP_VENDOR_ID, HP_LM940_PRODUCT_ID) }, |
111 | { USB_DEVICE(HP_VENDOR_ID, HP_TD620_PRODUCT_ID) }, |
112 | { USB_DEVICE(CRESSI_VENDOR_ID, CRESSI_EDY_PRODUCT_ID) }, |
113 | { USB_DEVICE(ZEAGLE_VENDOR_ID, ZEAGLE_N2ITION3_PRODUCT_ID) }, |
114 | { USB_DEVICE(SONY_VENDOR_ID, SONY_QN3USB_PRODUCT_ID) }, |
115 | { USB_DEVICE(SANWA_VENDOR_ID, SANWA_PRODUCT_ID) }, |
116 | { USB_DEVICE(ADLINK_VENDOR_ID, ADLINK_ND6530_PRODUCT_ID) }, |
117 | { USB_DEVICE(ADLINK_VENDOR_ID, ADLINK_ND6530GC_PRODUCT_ID) }, |
118 | { USB_DEVICE(SMART_VENDOR_ID, SMART_PRODUCT_ID) }, |
119 | { USB_DEVICE(AT_VENDOR_ID, AT_VTKIT3_PRODUCT_ID) }, |
120 | { USB_DEVICE(IBM_VENDOR_ID, IBM_PRODUCT_ID) }, |
121 | { } /* Terminating entry */ |
122 | }; |
123 | |
124 | MODULE_DEVICE_TABLE(usb, id_table); |
125 | |
126 | #define SET_LINE_REQUEST_TYPE 0x21 |
127 | #define SET_LINE_REQUEST 0x20 |
128 | |
129 | #define SET_CONTROL_REQUEST_TYPE 0x21 |
130 | #define SET_CONTROL_REQUEST 0x22 |
131 | #define CONTROL_DTR 0x01 |
132 | #define CONTROL_RTS 0x02 |
133 | |
134 | #define BREAK_REQUEST_TYPE 0x21 |
135 | #define BREAK_REQUEST 0x23 |
136 | #define BREAK_ON 0xffff |
137 | #define BREAK_OFF 0x0000 |
138 | |
139 | #define GET_LINE_REQUEST_TYPE 0xa1 |
140 | #define GET_LINE_REQUEST 0x21 |
141 | |
142 | #define VENDOR_WRITE_REQUEST_TYPE 0x40 |
143 | #define VENDOR_WRITE_REQUEST 0x01 |
144 | #define VENDOR_WRITE_NREQUEST 0x80 |
145 | |
146 | #define VENDOR_READ_REQUEST_TYPE 0xc0 |
147 | #define VENDOR_READ_REQUEST 0x01 |
148 | #define VENDOR_READ_NREQUEST 0x81 |
149 | |
150 | #define UART_STATE_INDEX 8 |
151 | #define UART_STATE_MSR_MASK 0x8b |
152 | #define UART_STATE_TRANSIENT_MASK 0x74 |
153 | #define UART_DCD 0x01 |
154 | #define UART_DSR 0x02 |
155 | #define UART_BREAK_ERROR 0x04 |
156 | #define UART_RING 0x08 |
157 | #define UART_FRAME_ERROR 0x10 |
158 | #define UART_PARITY_ERROR 0x20 |
159 | #define UART_OVERRUN_ERROR 0x40 |
160 | #define UART_CTS 0x80 |
161 | |
162 | #define PL2303_FLOWCTRL_MASK 0xf0 |
163 | |
164 | #define PL2303_READ_TYPE_HX_STATUS 0x8080 |
165 | |
166 | #define PL2303_HXN_RESET_REG 0x07 |
167 | #define PL2303_HXN_RESET_UPSTREAM_PIPE 0x02 |
168 | #define PL2303_HXN_RESET_DOWNSTREAM_PIPE 0x01 |
169 | |
170 | #define PL2303_HXN_FLOWCTRL_REG 0x0a |
171 | #define PL2303_HXN_FLOWCTRL_MASK 0x1c |
172 | #define PL2303_HXN_FLOWCTRL_NONE 0x1c |
173 | #define PL2303_HXN_FLOWCTRL_RTS_CTS 0x18 |
174 | #define PL2303_HXN_FLOWCTRL_XON_XOFF 0x0c |
175 | |
176 | static int pl2303_set_break(struct usb_serial_port *port, bool enable); |
177 | |
178 | enum pl2303_type { |
179 | TYPE_H, |
180 | TYPE_HX, |
181 | TYPE_TA, |
182 | TYPE_TB, |
183 | TYPE_HXD, |
184 | TYPE_HXN, |
185 | TYPE_COUNT |
186 | }; |
187 | |
188 | struct pl2303_type_data { |
189 | const char *name; |
190 | speed_t max_baud_rate; |
191 | unsigned long quirks; |
192 | unsigned int no_autoxonxoff:1; |
193 | unsigned int no_divisors:1; |
194 | unsigned int alt_divisors:1; |
195 | }; |
196 | |
197 | struct pl2303_serial_private { |
198 | const struct pl2303_type_data *type; |
199 | unsigned long quirks; |
200 | }; |
201 | |
202 | struct pl2303_private { |
203 | spinlock_t lock; |
204 | u8 line_control; |
205 | u8 line_status; |
206 | |
207 | u8 line_settings[7]; |
208 | }; |
209 | |
210 | static const struct pl2303_type_data pl2303_type_data[TYPE_COUNT] = { |
211 | [TYPE_H] = { |
212 | .name = "H" , |
213 | .max_baud_rate = 1228800, |
214 | .quirks = PL2303_QUIRK_LEGACY, |
215 | .no_autoxonxoff = true, |
216 | }, |
217 | [TYPE_HX] = { |
218 | .name = "HX" , |
219 | .max_baud_rate = 6000000, |
220 | }, |
221 | [TYPE_TA] = { |
222 | .name = "TA" , |
223 | .max_baud_rate = 6000000, |
224 | .alt_divisors = true, |
225 | }, |
226 | [TYPE_TB] = { |
227 | .name = "TB" , |
228 | .max_baud_rate = 12000000, |
229 | .alt_divisors = true, |
230 | }, |
231 | [TYPE_HXD] = { |
232 | .name = "HXD" , |
233 | .max_baud_rate = 12000000, |
234 | }, |
235 | [TYPE_HXN] = { |
236 | .name = "G" , |
237 | .max_baud_rate = 12000000, |
238 | .no_divisors = true, |
239 | }, |
240 | }; |
241 | |
242 | static int pl2303_vendor_read(struct usb_serial *serial, u16 value, |
243 | unsigned char buf[1]) |
244 | { |
245 | struct pl2303_serial_private *spriv = usb_get_serial_data(serial); |
246 | struct device *dev = &serial->interface->dev; |
247 | u8 request; |
248 | int res; |
249 | |
250 | if (spriv->type == &pl2303_type_data[TYPE_HXN]) |
251 | request = VENDOR_READ_NREQUEST; |
252 | else |
253 | request = VENDOR_READ_REQUEST; |
254 | |
255 | res = usb_control_msg(dev: serial->dev, usb_rcvctrlpipe(serial->dev, 0), |
256 | request, VENDOR_READ_REQUEST_TYPE, |
257 | value, index: 0, data: buf, size: 1, timeout: 100); |
258 | if (res != 1) { |
259 | dev_err(dev, "%s - failed to read [%04x]: %d\n" , __func__, |
260 | value, res); |
261 | if (res >= 0) |
262 | res = -EIO; |
263 | |
264 | return res; |
265 | } |
266 | |
267 | dev_dbg(dev, "%s - [%04x] = %02x\n" , __func__, value, buf[0]); |
268 | |
269 | return 0; |
270 | } |
271 | |
272 | static int pl2303_vendor_write(struct usb_serial *serial, u16 value, u16 index) |
273 | { |
274 | struct pl2303_serial_private *spriv = usb_get_serial_data(serial); |
275 | struct device *dev = &serial->interface->dev; |
276 | u8 request; |
277 | int res; |
278 | |
279 | dev_dbg(dev, "%s - [%04x] = %02x\n" , __func__, value, index); |
280 | |
281 | if (spriv->type == &pl2303_type_data[TYPE_HXN]) |
282 | request = VENDOR_WRITE_NREQUEST; |
283 | else |
284 | request = VENDOR_WRITE_REQUEST; |
285 | |
286 | res = usb_control_msg(dev: serial->dev, usb_sndctrlpipe(serial->dev, 0), |
287 | request, VENDOR_WRITE_REQUEST_TYPE, |
288 | value, index, NULL, size: 0, timeout: 100); |
289 | if (res) { |
290 | dev_err(dev, "%s - failed to write [%04x]: %d\n" , __func__, |
291 | value, res); |
292 | return res; |
293 | } |
294 | |
295 | return 0; |
296 | } |
297 | |
298 | static int pl2303_update_reg(struct usb_serial *serial, u8 reg, u8 mask, u8 val) |
299 | { |
300 | struct pl2303_serial_private *spriv = usb_get_serial_data(serial); |
301 | int ret = 0; |
302 | u8 *buf; |
303 | |
304 | buf = kmalloc(size: 1, GFP_KERNEL); |
305 | if (!buf) |
306 | return -ENOMEM; |
307 | |
308 | if (spriv->type == &pl2303_type_data[TYPE_HXN]) |
309 | ret = pl2303_vendor_read(serial, value: reg, buf); |
310 | else |
311 | ret = pl2303_vendor_read(serial, value: reg | 0x80, buf); |
312 | |
313 | if (ret) |
314 | goto out_free; |
315 | |
316 | *buf &= ~mask; |
317 | *buf |= val & mask; |
318 | |
319 | ret = pl2303_vendor_write(serial, value: reg, index: *buf); |
320 | out_free: |
321 | kfree(objp: buf); |
322 | |
323 | return ret; |
324 | } |
325 | |
326 | static int pl2303_probe(struct usb_serial *serial, |
327 | const struct usb_device_id *id) |
328 | { |
329 | usb_set_serial_data(serial, data: (void *)id->driver_info); |
330 | |
331 | return 0; |
332 | } |
333 | |
334 | /* |
335 | * Use interrupt endpoint from first interface if available. |
336 | * |
337 | * This is needed due to the looney way its endpoints are set up. |
338 | */ |
339 | static int pl2303_endpoint_hack(struct usb_serial *serial, |
340 | struct usb_serial_endpoints *epds) |
341 | { |
342 | struct usb_interface *interface = serial->interface; |
343 | struct usb_device *dev = serial->dev; |
344 | struct device *ddev = &interface->dev; |
345 | struct usb_host_interface *iface_desc; |
346 | struct usb_endpoint_descriptor *endpoint; |
347 | unsigned int i; |
348 | |
349 | if (interface == dev->actconfig->interface[0]) |
350 | return 0; |
351 | |
352 | /* check out the endpoints of the other interface */ |
353 | iface_desc = dev->actconfig->interface[0]->cur_altsetting; |
354 | |
355 | for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) { |
356 | endpoint = &iface_desc->endpoint[i].desc; |
357 | |
358 | if (!usb_endpoint_is_int_in(epd: endpoint)) |
359 | continue; |
360 | |
361 | dev_dbg(ddev, "found interrupt in on separate interface\n" ); |
362 | if (epds->num_interrupt_in < ARRAY_SIZE(epds->interrupt_in)) |
363 | epds->interrupt_in[epds->num_interrupt_in++] = endpoint; |
364 | } |
365 | |
366 | return 0; |
367 | } |
368 | |
369 | static int pl2303_calc_num_ports(struct usb_serial *serial, |
370 | struct usb_serial_endpoints *epds) |
371 | { |
372 | unsigned long quirks = (unsigned long)usb_get_serial_data(serial); |
373 | struct device *dev = &serial->interface->dev; |
374 | int ret; |
375 | |
376 | if (quirks & PL2303_QUIRK_ENDPOINT_HACK) { |
377 | ret = pl2303_endpoint_hack(serial, epds); |
378 | if (ret) |
379 | return ret; |
380 | } |
381 | |
382 | if (epds->num_interrupt_in < 1) { |
383 | dev_err(dev, "required interrupt-in endpoint missing\n" ); |
384 | return -ENODEV; |
385 | } |
386 | |
387 | return 1; |
388 | } |
389 | |
390 | static bool pl2303_supports_hx_status(struct usb_serial *serial) |
391 | { |
392 | int ret; |
393 | u8 buf; |
394 | |
395 | ret = usb_control_msg_recv(dev: serial->dev, endpoint: 0, VENDOR_READ_REQUEST, |
396 | VENDOR_READ_REQUEST_TYPE, PL2303_READ_TYPE_HX_STATUS, |
397 | index: 0, data: &buf, size: 1, timeout: 100, GFP_KERNEL); |
398 | |
399 | return ret == 0; |
400 | } |
401 | |
402 | static int pl2303_detect_type(struct usb_serial *serial) |
403 | { |
404 | struct usb_device_descriptor *desc = &serial->dev->descriptor; |
405 | u16 bcdDevice, bcdUSB; |
406 | |
407 | /* |
408 | * Legacy PL2303H, variants 0 and 1 (difference unknown). |
409 | */ |
410 | if (desc->bDeviceClass == 0x02) |
411 | return TYPE_H; /* variant 0 */ |
412 | |
413 | if (desc->bMaxPacketSize0 != 0x40) { |
414 | if (desc->bDeviceClass == 0x00 || desc->bDeviceClass == 0xff) |
415 | return TYPE_H; /* variant 1 */ |
416 | |
417 | return TYPE_H; /* variant 0 */ |
418 | } |
419 | |
420 | bcdDevice = le16_to_cpu(desc->bcdDevice); |
421 | bcdUSB = le16_to_cpu(desc->bcdUSB); |
422 | |
423 | switch (bcdUSB) { |
424 | case 0x101: |
425 | /* USB 1.0.1? Let's assume they meant 1.1... */ |
426 | fallthrough; |
427 | case 0x110: |
428 | switch (bcdDevice) { |
429 | case 0x300: |
430 | return TYPE_HX; |
431 | case 0x400: |
432 | return TYPE_HXD; |
433 | default: |
434 | return TYPE_HX; |
435 | } |
436 | break; |
437 | case 0x200: |
438 | switch (bcdDevice) { |
439 | case 0x100: /* GC */ |
440 | case 0x105: |
441 | return TYPE_HXN; |
442 | case 0x300: /* GT / TA */ |
443 | if (pl2303_supports_hx_status(serial)) |
444 | return TYPE_TA; |
445 | fallthrough; |
446 | case 0x305: |
447 | case 0x400: /* GL */ |
448 | case 0x405: |
449 | return TYPE_HXN; |
450 | case 0x500: /* GE / TB */ |
451 | if (pl2303_supports_hx_status(serial)) |
452 | return TYPE_TB; |
453 | fallthrough; |
454 | case 0x505: |
455 | case 0x600: /* GS */ |
456 | case 0x605: |
457 | case 0x700: /* GR */ |
458 | case 0x705: |
459 | return TYPE_HXN; |
460 | } |
461 | break; |
462 | } |
463 | |
464 | dev_err(&serial->interface->dev, |
465 | "unknown device type, please report to linux-usb@vger.kernel.org\n" ); |
466 | return -ENODEV; |
467 | } |
468 | |
469 | static int pl2303_startup(struct usb_serial *serial) |
470 | { |
471 | struct pl2303_serial_private *spriv; |
472 | enum pl2303_type type; |
473 | unsigned char *buf; |
474 | int ret; |
475 | |
476 | ret = pl2303_detect_type(serial); |
477 | if (ret < 0) |
478 | return ret; |
479 | |
480 | type = ret; |
481 | dev_dbg(&serial->interface->dev, "device type: %s\n" , pl2303_type_data[type].name); |
482 | |
483 | spriv = kzalloc(size: sizeof(*spriv), GFP_KERNEL); |
484 | if (!spriv) |
485 | return -ENOMEM; |
486 | |
487 | spriv->type = &pl2303_type_data[type]; |
488 | spriv->quirks = (unsigned long)usb_get_serial_data(serial); |
489 | spriv->quirks |= spriv->type->quirks; |
490 | |
491 | usb_set_serial_data(serial, data: spriv); |
492 | |
493 | if (type != TYPE_HXN) { |
494 | buf = kmalloc(size: 1, GFP_KERNEL); |
495 | if (!buf) { |
496 | kfree(objp: spriv); |
497 | return -ENOMEM; |
498 | } |
499 | |
500 | pl2303_vendor_read(serial, value: 0x8484, buf); |
501 | pl2303_vendor_write(serial, value: 0x0404, index: 0); |
502 | pl2303_vendor_read(serial, value: 0x8484, buf); |
503 | pl2303_vendor_read(serial, value: 0x8383, buf); |
504 | pl2303_vendor_read(serial, value: 0x8484, buf); |
505 | pl2303_vendor_write(serial, value: 0x0404, index: 1); |
506 | pl2303_vendor_read(serial, value: 0x8484, buf); |
507 | pl2303_vendor_read(serial, value: 0x8383, buf); |
508 | pl2303_vendor_write(serial, value: 0, index: 1); |
509 | pl2303_vendor_write(serial, value: 1, index: 0); |
510 | if (spriv->quirks & PL2303_QUIRK_LEGACY) |
511 | pl2303_vendor_write(serial, value: 2, index: 0x24); |
512 | else |
513 | pl2303_vendor_write(serial, value: 2, index: 0x44); |
514 | |
515 | kfree(objp: buf); |
516 | } |
517 | |
518 | return 0; |
519 | } |
520 | |
521 | static void pl2303_release(struct usb_serial *serial) |
522 | { |
523 | struct pl2303_serial_private *spriv = usb_get_serial_data(serial); |
524 | |
525 | kfree(objp: spriv); |
526 | } |
527 | |
528 | static int pl2303_port_probe(struct usb_serial_port *port) |
529 | { |
530 | struct pl2303_private *priv; |
531 | |
532 | priv = kzalloc(size: sizeof(*priv), GFP_KERNEL); |
533 | if (!priv) |
534 | return -ENOMEM; |
535 | |
536 | spin_lock_init(&priv->lock); |
537 | |
538 | usb_set_serial_port_data(port, data: priv); |
539 | |
540 | port->port.drain_delay = 256; |
541 | |
542 | return 0; |
543 | } |
544 | |
545 | static void pl2303_port_remove(struct usb_serial_port *port) |
546 | { |
547 | struct pl2303_private *priv = usb_get_serial_port_data(port); |
548 | |
549 | kfree(objp: priv); |
550 | } |
551 | |
552 | static int pl2303_set_control_lines(struct usb_serial_port *port, u8 value) |
553 | { |
554 | struct usb_device *dev = port->serial->dev; |
555 | int retval; |
556 | |
557 | dev_dbg(&port->dev, "%s - %02x\n" , __func__, value); |
558 | |
559 | retval = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), |
560 | SET_CONTROL_REQUEST, SET_CONTROL_REQUEST_TYPE, |
561 | value, index: 0, NULL, size: 0, timeout: 100); |
562 | if (retval) |
563 | dev_err(&port->dev, "%s - failed: %d\n" , __func__, retval); |
564 | |
565 | return retval; |
566 | } |
567 | |
568 | /* |
569 | * Returns the nearest supported baud rate that can be set directly without |
570 | * using divisors. |
571 | */ |
572 | static speed_t pl2303_get_supported_baud_rate(speed_t baud) |
573 | { |
574 | static const speed_t baud_sup[] = { |
575 | 75, 150, 300, 600, 1200, 1800, 2400, 3600, 4800, 7200, 9600, |
576 | 14400, 19200, 28800, 38400, 57600, 115200, 230400, 460800, |
577 | 614400, 921600, 1228800, 2457600, 3000000, 6000000 |
578 | }; |
579 | |
580 | unsigned i; |
581 | |
582 | for (i = 0; i < ARRAY_SIZE(baud_sup); ++i) { |
583 | if (baud_sup[i] > baud) |
584 | break; |
585 | } |
586 | |
587 | if (i == ARRAY_SIZE(baud_sup)) |
588 | baud = baud_sup[i - 1]; |
589 | else if (i > 0 && (baud_sup[i] - baud) > (baud - baud_sup[i - 1])) |
590 | baud = baud_sup[i - 1]; |
591 | else |
592 | baud = baud_sup[i]; |
593 | |
594 | return baud; |
595 | } |
596 | |
597 | /* |
598 | * NOTE: If unsupported baud rates are set directly, the PL2303 seems to |
599 | * use 9600 baud. |
600 | */ |
601 | static speed_t pl2303_encode_baud_rate_direct(unsigned char buf[4], |
602 | speed_t baud) |
603 | { |
604 | put_unaligned_le32(val: baud, p: buf); |
605 | |
606 | return baud; |
607 | } |
608 | |
609 | static speed_t pl2303_encode_baud_rate_divisor(unsigned char buf[4], |
610 | speed_t baud) |
611 | { |
612 | unsigned int baseline, mantissa, exponent; |
613 | |
614 | /* |
615 | * Apparently the formula is: |
616 | * baudrate = 12M * 32 / (mantissa * 4^exponent) |
617 | * where |
618 | * mantissa = buf[8:0] |
619 | * exponent = buf[11:9] |
620 | */ |
621 | baseline = 12000000 * 32; |
622 | mantissa = baseline / baud; |
623 | if (mantissa == 0) |
624 | mantissa = 1; /* Avoid dividing by zero if baud > 32*12M. */ |
625 | exponent = 0; |
626 | while (mantissa >= 512) { |
627 | if (exponent < 7) { |
628 | mantissa >>= 2; /* divide by 4 */ |
629 | exponent++; |
630 | } else { |
631 | /* Exponent is maxed. Trim mantissa and leave. */ |
632 | mantissa = 511; |
633 | break; |
634 | } |
635 | } |
636 | |
637 | buf[3] = 0x80; |
638 | buf[2] = 0; |
639 | buf[1] = exponent << 1 | mantissa >> 8; |
640 | buf[0] = mantissa & 0xff; |
641 | |
642 | /* Calculate and return the exact baud rate. */ |
643 | baud = (baseline / mantissa) >> (exponent << 1); |
644 | |
645 | return baud; |
646 | } |
647 | |
648 | static speed_t pl2303_encode_baud_rate_divisor_alt(unsigned char buf[4], |
649 | speed_t baud) |
650 | { |
651 | unsigned int baseline, mantissa, exponent; |
652 | |
653 | /* |
654 | * Apparently, for the TA version the formula is: |
655 | * baudrate = 12M * 32 / (mantissa * 2^exponent) |
656 | * where |
657 | * mantissa = buf[10:0] |
658 | * exponent = buf[15:13 16] |
659 | */ |
660 | baseline = 12000000 * 32; |
661 | mantissa = baseline / baud; |
662 | if (mantissa == 0) |
663 | mantissa = 1; /* Avoid dividing by zero if baud > 32*12M. */ |
664 | exponent = 0; |
665 | while (mantissa >= 2048) { |
666 | if (exponent < 15) { |
667 | mantissa >>= 1; /* divide by 2 */ |
668 | exponent++; |
669 | } else { |
670 | /* Exponent is maxed. Trim mantissa and leave. */ |
671 | mantissa = 2047; |
672 | break; |
673 | } |
674 | } |
675 | |
676 | buf[3] = 0x80; |
677 | buf[2] = exponent & 0x01; |
678 | buf[1] = (exponent & ~0x01) << 4 | mantissa >> 8; |
679 | buf[0] = mantissa & 0xff; |
680 | |
681 | /* Calculate and return the exact baud rate. */ |
682 | baud = (baseline / mantissa) >> exponent; |
683 | |
684 | return baud; |
685 | } |
686 | |
687 | static void pl2303_encode_baud_rate(struct tty_struct *tty, |
688 | struct usb_serial_port *port, |
689 | u8 buf[4]) |
690 | { |
691 | struct usb_serial *serial = port->serial; |
692 | struct pl2303_serial_private *spriv = usb_get_serial_data(serial); |
693 | speed_t baud_sup; |
694 | speed_t baud; |
695 | |
696 | baud = tty_get_baud_rate(tty); |
697 | dev_dbg(&port->dev, "baud requested = %u\n" , baud); |
698 | if (!baud) |
699 | return; |
700 | |
701 | if (spriv->type->max_baud_rate) |
702 | baud = min_t(speed_t, baud, spriv->type->max_baud_rate); |
703 | /* |
704 | * Use direct method for supported baud rates, otherwise use divisors. |
705 | * Newer chip types do not support divisor encoding. |
706 | */ |
707 | if (spriv->type->no_divisors) |
708 | baud_sup = baud; |
709 | else |
710 | baud_sup = pl2303_get_supported_baud_rate(baud); |
711 | |
712 | if (baud == baud_sup) |
713 | baud = pl2303_encode_baud_rate_direct(buf, baud); |
714 | else if (spriv->type->alt_divisors) |
715 | baud = pl2303_encode_baud_rate_divisor_alt(buf, baud); |
716 | else |
717 | baud = pl2303_encode_baud_rate_divisor(buf, baud); |
718 | |
719 | /* Save resulting baud rate */ |
720 | tty_encode_baud_rate(tty, ibaud: baud, obaud: baud); |
721 | dev_dbg(&port->dev, "baud set = %u\n" , baud); |
722 | } |
723 | |
724 | static int pl2303_get_line_request(struct usb_serial_port *port, |
725 | unsigned char buf[7]) |
726 | { |
727 | struct usb_device *udev = port->serial->dev; |
728 | int ret; |
729 | |
730 | ret = usb_control_msg(dev: udev, usb_rcvctrlpipe(udev, 0), |
731 | GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE, |
732 | value: 0, index: 0, data: buf, size: 7, timeout: 100); |
733 | if (ret != 7) { |
734 | dev_err(&port->dev, "%s - failed: %d\n" , __func__, ret); |
735 | |
736 | if (ret >= 0) |
737 | ret = -EIO; |
738 | |
739 | return ret; |
740 | } |
741 | |
742 | dev_dbg(&port->dev, "%s - %7ph\n" , __func__, buf); |
743 | |
744 | return 0; |
745 | } |
746 | |
747 | static int pl2303_set_line_request(struct usb_serial_port *port, |
748 | unsigned char buf[7]) |
749 | { |
750 | struct usb_device *udev = port->serial->dev; |
751 | int ret; |
752 | |
753 | ret = usb_control_msg(dev: udev, usb_sndctrlpipe(udev, 0), |
754 | SET_LINE_REQUEST, SET_LINE_REQUEST_TYPE, |
755 | value: 0, index: 0, data: buf, size: 7, timeout: 100); |
756 | if (ret < 0) { |
757 | dev_err(&port->dev, "%s - failed: %d\n" , __func__, ret); |
758 | return ret; |
759 | } |
760 | |
761 | dev_dbg(&port->dev, "%s - %7ph\n" , __func__, buf); |
762 | |
763 | return 0; |
764 | } |
765 | |
766 | static bool pl2303_termios_change(const struct ktermios *a, const struct ktermios *b) |
767 | { |
768 | bool ixon_change; |
769 | |
770 | ixon_change = ((a->c_iflag ^ b->c_iflag) & (IXON | IXANY)) || |
771 | a->c_cc[VSTART] != b->c_cc[VSTART] || |
772 | a->c_cc[VSTOP] != b->c_cc[VSTOP]; |
773 | |
774 | return tty_termios_hw_change(a, b) || ixon_change; |
775 | } |
776 | |
777 | static bool pl2303_enable_xonxoff(struct tty_struct *tty, const struct pl2303_type_data *type) |
778 | { |
779 | if (!I_IXON(tty) || I_IXANY(tty)) |
780 | return false; |
781 | |
782 | if (START_CHAR(tty) != 0x11 || STOP_CHAR(tty) != 0x13) |
783 | return false; |
784 | |
785 | if (type->no_autoxonxoff) |
786 | return false; |
787 | |
788 | return true; |
789 | } |
790 | |
791 | static void pl2303_set_termios(struct tty_struct *tty, |
792 | struct usb_serial_port *port, |
793 | const struct ktermios *old_termios) |
794 | { |
795 | struct usb_serial *serial = port->serial; |
796 | struct pl2303_serial_private *spriv = usb_get_serial_data(serial); |
797 | struct pl2303_private *priv = usb_get_serial_port_data(port); |
798 | unsigned long flags; |
799 | unsigned char *buf; |
800 | int ret; |
801 | u8 control; |
802 | |
803 | if (old_termios && !pl2303_termios_change(a: &tty->termios, b: old_termios)) |
804 | return; |
805 | |
806 | buf = kzalloc(size: 7, GFP_KERNEL); |
807 | if (!buf) { |
808 | /* Report back no change occurred */ |
809 | if (old_termios) |
810 | tty->termios = *old_termios; |
811 | return; |
812 | } |
813 | |
814 | pl2303_get_line_request(port, buf); |
815 | |
816 | buf[6] = tty_get_char_size(cflag: tty->termios.c_cflag); |
817 | dev_dbg(&port->dev, "data bits = %d\n" , buf[6]); |
818 | |
819 | /* For reference buf[0]:buf[3] baud rate value */ |
820 | pl2303_encode_baud_rate(tty, port, buf: &buf[0]); |
821 | |
822 | /* For reference buf[4]=0 is 1 stop bits */ |
823 | /* For reference buf[4]=1 is 1.5 stop bits */ |
824 | /* For reference buf[4]=2 is 2 stop bits */ |
825 | if (C_CSTOPB(tty)) { |
826 | /* |
827 | * NOTE: Comply with "real" UARTs / RS232: |
828 | * use 1.5 instead of 2 stop bits with 5 data bits |
829 | */ |
830 | if (C_CSIZE(tty) == CS5) { |
831 | buf[4] = 1; |
832 | dev_dbg(&port->dev, "stop bits = 1.5\n" ); |
833 | } else { |
834 | buf[4] = 2; |
835 | dev_dbg(&port->dev, "stop bits = 2\n" ); |
836 | } |
837 | } else { |
838 | buf[4] = 0; |
839 | dev_dbg(&port->dev, "stop bits = 1\n" ); |
840 | } |
841 | |
842 | if (C_PARENB(tty)) { |
843 | /* For reference buf[5]=0 is none parity */ |
844 | /* For reference buf[5]=1 is odd parity */ |
845 | /* For reference buf[5]=2 is even parity */ |
846 | /* For reference buf[5]=3 is mark parity */ |
847 | /* For reference buf[5]=4 is space parity */ |
848 | if (C_PARODD(tty)) { |
849 | if (C_CMSPAR(tty)) { |
850 | buf[5] = 3; |
851 | dev_dbg(&port->dev, "parity = mark\n" ); |
852 | } else { |
853 | buf[5] = 1; |
854 | dev_dbg(&port->dev, "parity = odd\n" ); |
855 | } |
856 | } else { |
857 | if (C_CMSPAR(tty)) { |
858 | buf[5] = 4; |
859 | dev_dbg(&port->dev, "parity = space\n" ); |
860 | } else { |
861 | buf[5] = 2; |
862 | dev_dbg(&port->dev, "parity = even\n" ); |
863 | } |
864 | } |
865 | } else { |
866 | buf[5] = 0; |
867 | dev_dbg(&port->dev, "parity = none\n" ); |
868 | } |
869 | |
870 | /* |
871 | * Some PL2303 are known to lose bytes if you change serial settings |
872 | * even to the same values as before. Thus we actually need to filter |
873 | * in this specific case. |
874 | * |
875 | * Note that the tty_termios_hw_change check above is not sufficient |
876 | * as a previously requested baud rate may differ from the one |
877 | * actually used (and stored in old_termios). |
878 | * |
879 | * NOTE: No additional locking needed for line_settings as it is |
880 | * only used in set_termios, which is serialised against itself. |
881 | */ |
882 | if (!old_termios || memcmp(p: buf, q: priv->line_settings, size: 7)) { |
883 | ret = pl2303_set_line_request(port, buf); |
884 | if (!ret) |
885 | memcpy(priv->line_settings, buf, 7); |
886 | } |
887 | |
888 | /* change control lines if we are switching to or from B0 */ |
889 | spin_lock_irqsave(&priv->lock, flags); |
890 | control = priv->line_control; |
891 | if (C_BAUD(tty) == B0) |
892 | priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS); |
893 | else if (old_termios && (old_termios->c_cflag & CBAUD) == B0) |
894 | priv->line_control |= (CONTROL_DTR | CONTROL_RTS); |
895 | if (control != priv->line_control) { |
896 | control = priv->line_control; |
897 | spin_unlock_irqrestore(lock: &priv->lock, flags); |
898 | pl2303_set_control_lines(port, value: control); |
899 | } else { |
900 | spin_unlock_irqrestore(lock: &priv->lock, flags); |
901 | } |
902 | |
903 | if (C_CRTSCTS(tty)) { |
904 | if (spriv->quirks & PL2303_QUIRK_LEGACY) { |
905 | pl2303_update_reg(serial, reg: 0, PL2303_FLOWCTRL_MASK, val: 0x40); |
906 | } else if (spriv->type == &pl2303_type_data[TYPE_HXN]) { |
907 | pl2303_update_reg(serial, PL2303_HXN_FLOWCTRL_REG, |
908 | PL2303_HXN_FLOWCTRL_MASK, |
909 | PL2303_HXN_FLOWCTRL_RTS_CTS); |
910 | } else { |
911 | pl2303_update_reg(serial, reg: 0, PL2303_FLOWCTRL_MASK, val: 0x60); |
912 | } |
913 | } else if (pl2303_enable_xonxoff(tty, type: spriv->type)) { |
914 | if (spriv->type == &pl2303_type_data[TYPE_HXN]) { |
915 | pl2303_update_reg(serial, PL2303_HXN_FLOWCTRL_REG, |
916 | PL2303_HXN_FLOWCTRL_MASK, |
917 | PL2303_HXN_FLOWCTRL_XON_XOFF); |
918 | } else { |
919 | pl2303_update_reg(serial, reg: 0, PL2303_FLOWCTRL_MASK, val: 0xc0); |
920 | } |
921 | } else { |
922 | if (spriv->type == &pl2303_type_data[TYPE_HXN]) { |
923 | pl2303_update_reg(serial, PL2303_HXN_FLOWCTRL_REG, |
924 | PL2303_HXN_FLOWCTRL_MASK, |
925 | PL2303_HXN_FLOWCTRL_NONE); |
926 | } else { |
927 | pl2303_update_reg(serial, reg: 0, PL2303_FLOWCTRL_MASK, val: 0); |
928 | } |
929 | } |
930 | |
931 | kfree(objp: buf); |
932 | } |
933 | |
934 | static void pl2303_dtr_rts(struct usb_serial_port *port, int on) |
935 | { |
936 | struct pl2303_private *priv = usb_get_serial_port_data(port); |
937 | unsigned long flags; |
938 | u8 control; |
939 | |
940 | spin_lock_irqsave(&priv->lock, flags); |
941 | if (on) |
942 | priv->line_control |= (CONTROL_DTR | CONTROL_RTS); |
943 | else |
944 | priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS); |
945 | control = priv->line_control; |
946 | spin_unlock_irqrestore(lock: &priv->lock, flags); |
947 | |
948 | pl2303_set_control_lines(port, value: control); |
949 | } |
950 | |
951 | static void pl2303_close(struct usb_serial_port *port) |
952 | { |
953 | usb_serial_generic_close(port); |
954 | usb_kill_urb(urb: port->interrupt_in_urb); |
955 | pl2303_set_break(port, enable: false); |
956 | } |
957 | |
958 | static int pl2303_open(struct tty_struct *tty, struct usb_serial_port *port) |
959 | { |
960 | struct usb_serial *serial = port->serial; |
961 | struct pl2303_serial_private *spriv = usb_get_serial_data(serial); |
962 | int result; |
963 | |
964 | if (spriv->quirks & PL2303_QUIRK_LEGACY) { |
965 | usb_clear_halt(dev: serial->dev, pipe: port->write_urb->pipe); |
966 | usb_clear_halt(dev: serial->dev, pipe: port->read_urb->pipe); |
967 | } else { |
968 | /* reset upstream data pipes */ |
969 | if (spriv->type == &pl2303_type_data[TYPE_HXN]) { |
970 | pl2303_vendor_write(serial, PL2303_HXN_RESET_REG, |
971 | PL2303_HXN_RESET_UPSTREAM_PIPE | |
972 | PL2303_HXN_RESET_DOWNSTREAM_PIPE); |
973 | } else { |
974 | pl2303_vendor_write(serial, value: 8, index: 0); |
975 | pl2303_vendor_write(serial, value: 9, index: 0); |
976 | } |
977 | } |
978 | |
979 | /* Setup termios */ |
980 | if (tty) |
981 | pl2303_set_termios(tty, port, NULL); |
982 | |
983 | result = usb_submit_urb(urb: port->interrupt_in_urb, GFP_KERNEL); |
984 | if (result) { |
985 | dev_err(&port->dev, "failed to submit interrupt urb: %d\n" , |
986 | result); |
987 | return result; |
988 | } |
989 | |
990 | result = usb_serial_generic_open(tty, port); |
991 | if (result) { |
992 | usb_kill_urb(urb: port->interrupt_in_urb); |
993 | return result; |
994 | } |
995 | |
996 | return 0; |
997 | } |
998 | |
999 | static int pl2303_tiocmset(struct tty_struct *tty, |
1000 | unsigned int set, unsigned int clear) |
1001 | { |
1002 | struct usb_serial_port *port = tty->driver_data; |
1003 | struct pl2303_private *priv = usb_get_serial_port_data(port); |
1004 | unsigned long flags; |
1005 | u8 control; |
1006 | int ret; |
1007 | |
1008 | spin_lock_irqsave(&priv->lock, flags); |
1009 | if (set & TIOCM_RTS) |
1010 | priv->line_control |= CONTROL_RTS; |
1011 | if (set & TIOCM_DTR) |
1012 | priv->line_control |= CONTROL_DTR; |
1013 | if (clear & TIOCM_RTS) |
1014 | priv->line_control &= ~CONTROL_RTS; |
1015 | if (clear & TIOCM_DTR) |
1016 | priv->line_control &= ~CONTROL_DTR; |
1017 | control = priv->line_control; |
1018 | spin_unlock_irqrestore(lock: &priv->lock, flags); |
1019 | |
1020 | ret = pl2303_set_control_lines(port, value: control); |
1021 | if (ret) |
1022 | return usb_translate_errors(error_code: ret); |
1023 | |
1024 | return 0; |
1025 | } |
1026 | |
1027 | static int pl2303_tiocmget(struct tty_struct *tty) |
1028 | { |
1029 | struct usb_serial_port *port = tty->driver_data; |
1030 | struct pl2303_private *priv = usb_get_serial_port_data(port); |
1031 | unsigned long flags; |
1032 | unsigned int mcr; |
1033 | unsigned int status; |
1034 | unsigned int result; |
1035 | |
1036 | spin_lock_irqsave(&priv->lock, flags); |
1037 | mcr = priv->line_control; |
1038 | status = priv->line_status; |
1039 | spin_unlock_irqrestore(lock: &priv->lock, flags); |
1040 | |
1041 | result = ((mcr & CONTROL_DTR) ? TIOCM_DTR : 0) |
1042 | | ((mcr & CONTROL_RTS) ? TIOCM_RTS : 0) |
1043 | | ((status & UART_CTS) ? TIOCM_CTS : 0) |
1044 | | ((status & UART_DSR) ? TIOCM_DSR : 0) |
1045 | | ((status & UART_RING) ? TIOCM_RI : 0) |
1046 | | ((status & UART_DCD) ? TIOCM_CD : 0); |
1047 | |
1048 | dev_dbg(&port->dev, "%s - result = %x\n" , __func__, result); |
1049 | |
1050 | return result; |
1051 | } |
1052 | |
1053 | static int pl2303_carrier_raised(struct usb_serial_port *port) |
1054 | { |
1055 | struct pl2303_private *priv = usb_get_serial_port_data(port); |
1056 | |
1057 | if (priv->line_status & UART_DCD) |
1058 | return 1; |
1059 | |
1060 | return 0; |
1061 | } |
1062 | |
1063 | static int pl2303_set_break(struct usb_serial_port *port, bool enable) |
1064 | { |
1065 | struct usb_serial *serial = port->serial; |
1066 | u16 state; |
1067 | int result; |
1068 | |
1069 | if (enable) |
1070 | state = BREAK_ON; |
1071 | else |
1072 | state = BREAK_OFF; |
1073 | |
1074 | dev_dbg(&port->dev, "%s - turning break %s\n" , __func__, |
1075 | state == BREAK_OFF ? "off" : "on" ); |
1076 | |
1077 | result = usb_control_msg(dev: serial->dev, usb_sndctrlpipe(serial->dev, 0), |
1078 | BREAK_REQUEST, BREAK_REQUEST_TYPE, value: state, |
1079 | index: 0, NULL, size: 0, timeout: 100); |
1080 | if (result) { |
1081 | dev_err(&port->dev, "error sending break = %d\n" , result); |
1082 | return result; |
1083 | } |
1084 | |
1085 | return 0; |
1086 | } |
1087 | |
1088 | static int pl2303_break_ctl(struct tty_struct *tty, int state) |
1089 | { |
1090 | struct usb_serial_port *port = tty->driver_data; |
1091 | |
1092 | return pl2303_set_break(port, enable: state); |
1093 | } |
1094 | |
1095 | static void pl2303_update_line_status(struct usb_serial_port *port, |
1096 | unsigned char *data, |
1097 | unsigned int actual_length) |
1098 | { |
1099 | struct usb_serial *serial = port->serial; |
1100 | struct pl2303_serial_private *spriv = usb_get_serial_data(serial); |
1101 | struct pl2303_private *priv = usb_get_serial_port_data(port); |
1102 | struct tty_struct *tty; |
1103 | unsigned long flags; |
1104 | unsigned int status_idx = UART_STATE_INDEX; |
1105 | u8 status; |
1106 | u8 delta; |
1107 | |
1108 | if (spriv->quirks & PL2303_QUIRK_UART_STATE_IDX0) |
1109 | status_idx = 0; |
1110 | |
1111 | if (actual_length < status_idx + 1) |
1112 | return; |
1113 | |
1114 | status = data[status_idx]; |
1115 | |
1116 | /* Save off the uart status for others to look at */ |
1117 | spin_lock_irqsave(&priv->lock, flags); |
1118 | delta = priv->line_status ^ status; |
1119 | priv->line_status = status; |
1120 | spin_unlock_irqrestore(lock: &priv->lock, flags); |
1121 | |
1122 | if (status & UART_BREAK_ERROR) |
1123 | usb_serial_handle_break(port); |
1124 | |
1125 | if (delta & UART_STATE_MSR_MASK) { |
1126 | if (delta & UART_CTS) |
1127 | port->icount.cts++; |
1128 | if (delta & UART_DSR) |
1129 | port->icount.dsr++; |
1130 | if (delta & UART_RING) |
1131 | port->icount.rng++; |
1132 | if (delta & UART_DCD) { |
1133 | port->icount.dcd++; |
1134 | tty = tty_port_tty_get(port: &port->port); |
1135 | if (tty) { |
1136 | usb_serial_handle_dcd_change(usb_port: port, tty, |
1137 | status: status & UART_DCD); |
1138 | tty_kref_put(tty); |
1139 | } |
1140 | } |
1141 | |
1142 | wake_up_interruptible(&port->port.delta_msr_wait); |
1143 | } |
1144 | } |
1145 | |
1146 | static void pl2303_read_int_callback(struct urb *urb) |
1147 | { |
1148 | struct usb_serial_port *port = urb->context; |
1149 | unsigned char *data = urb->transfer_buffer; |
1150 | unsigned int actual_length = urb->actual_length; |
1151 | int status = urb->status; |
1152 | int retval; |
1153 | |
1154 | switch (status) { |
1155 | case 0: |
1156 | /* success */ |
1157 | break; |
1158 | case -ECONNRESET: |
1159 | case -ENOENT: |
1160 | case -ESHUTDOWN: |
1161 | /* this urb is terminated, clean up */ |
1162 | dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n" , |
1163 | __func__, status); |
1164 | return; |
1165 | default: |
1166 | dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n" , |
1167 | __func__, status); |
1168 | goto exit; |
1169 | } |
1170 | |
1171 | usb_serial_debug_data(dev: &port->dev, function: __func__, |
1172 | size: urb->actual_length, data: urb->transfer_buffer); |
1173 | |
1174 | pl2303_update_line_status(port, data, actual_length); |
1175 | |
1176 | exit: |
1177 | retval = usb_submit_urb(urb, GFP_ATOMIC); |
1178 | if (retval) { |
1179 | dev_err(&port->dev, |
1180 | "%s - usb_submit_urb failed with result %d\n" , |
1181 | __func__, retval); |
1182 | } |
1183 | } |
1184 | |
1185 | static void pl2303_process_read_urb(struct urb *urb) |
1186 | { |
1187 | struct usb_serial_port *port = urb->context; |
1188 | struct pl2303_private *priv = usb_get_serial_port_data(port); |
1189 | unsigned char *data = urb->transfer_buffer; |
1190 | char tty_flag = TTY_NORMAL; |
1191 | unsigned long flags; |
1192 | u8 line_status; |
1193 | int i; |
1194 | |
1195 | /* update line status */ |
1196 | spin_lock_irqsave(&priv->lock, flags); |
1197 | line_status = priv->line_status; |
1198 | priv->line_status &= ~UART_STATE_TRANSIENT_MASK; |
1199 | spin_unlock_irqrestore(lock: &priv->lock, flags); |
1200 | |
1201 | if (!urb->actual_length) |
1202 | return; |
1203 | |
1204 | /* |
1205 | * Break takes precedence over parity, which takes precedence over |
1206 | * framing errors. |
1207 | */ |
1208 | if (line_status & UART_BREAK_ERROR) |
1209 | tty_flag = TTY_BREAK; |
1210 | else if (line_status & UART_PARITY_ERROR) |
1211 | tty_flag = TTY_PARITY; |
1212 | else if (line_status & UART_FRAME_ERROR) |
1213 | tty_flag = TTY_FRAME; |
1214 | |
1215 | if (tty_flag != TTY_NORMAL) |
1216 | dev_dbg(&port->dev, "%s - tty_flag = %d\n" , __func__, |
1217 | tty_flag); |
1218 | /* overrun is special, not associated with a char */ |
1219 | if (line_status & UART_OVERRUN_ERROR) |
1220 | tty_insert_flip_char(port: &port->port, ch: 0, TTY_OVERRUN); |
1221 | |
1222 | if (port->sysrq) { |
1223 | for (i = 0; i < urb->actual_length; ++i) |
1224 | if (!usb_serial_handle_sysrq_char(port, ch: data[i])) |
1225 | tty_insert_flip_char(port: &port->port, ch: data[i], |
1226 | flag: tty_flag); |
1227 | } else { |
1228 | tty_insert_flip_string_fixed_flag(port: &port->port, chars: data, flag: tty_flag, |
1229 | size: urb->actual_length); |
1230 | } |
1231 | |
1232 | tty_flip_buffer_push(port: &port->port); |
1233 | } |
1234 | |
1235 | static struct usb_serial_driver pl2303_device = { |
1236 | .driver = { |
1237 | .owner = THIS_MODULE, |
1238 | .name = "pl2303" , |
1239 | }, |
1240 | .id_table = id_table, |
1241 | .num_bulk_in = 1, |
1242 | .num_bulk_out = 1, |
1243 | .num_interrupt_in = 0, /* see pl2303_calc_num_ports */ |
1244 | .bulk_in_size = 256, |
1245 | .bulk_out_size = 256, |
1246 | .open = pl2303_open, |
1247 | .close = pl2303_close, |
1248 | .dtr_rts = pl2303_dtr_rts, |
1249 | .carrier_raised = pl2303_carrier_raised, |
1250 | .break_ctl = pl2303_break_ctl, |
1251 | .set_termios = pl2303_set_termios, |
1252 | .tiocmget = pl2303_tiocmget, |
1253 | .tiocmset = pl2303_tiocmset, |
1254 | .tiocmiwait = usb_serial_generic_tiocmiwait, |
1255 | .process_read_urb = pl2303_process_read_urb, |
1256 | .read_int_callback = pl2303_read_int_callback, |
1257 | .probe = pl2303_probe, |
1258 | .calc_num_ports = pl2303_calc_num_ports, |
1259 | .attach = pl2303_startup, |
1260 | .release = pl2303_release, |
1261 | .port_probe = pl2303_port_probe, |
1262 | .port_remove = pl2303_port_remove, |
1263 | }; |
1264 | |
1265 | static struct usb_serial_driver * const serial_drivers[] = { |
1266 | &pl2303_device, NULL |
1267 | }; |
1268 | |
1269 | module_usb_serial_driver(serial_drivers, id_table); |
1270 | |
1271 | MODULE_DESCRIPTION("Prolific PL2303 USB to serial adaptor driver" ); |
1272 | MODULE_LICENSE("GPL v2" ); |
1273 | |