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inet: frag: enforce memory limits earlier
[linux/fpc-iii.git] / drivers / usb / serial / cp210x.c
blobc2b120021443108337f88c2ab6b39e5aaf3b78d4
1 /*
2 * Silicon Laboratories CP210x USB to RS232 serial adaptor driver
3 *
4 * Copyright (C) 2005 Craig Shelley (craig@microtron.org.uk)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License version
8 * 2 as published by the Free Software Foundation.
9 *
10 * Support to set flow control line levels using TIOCMGET and TIOCMSET
11 * thanks to Karl Hiramoto karl@hiramoto.org. RTSCTS hardware flow
12 * control thanks to Munir Nassar nassarmu@real-time.com
13 *
14 */
15
16 #include <linux/kernel.h>
17 #include <linux/errno.h>
18 #include <linux/slab.h>
19 #include <linux/tty.h>
20 #include <linux/tty_flip.h>
21 #include <linux/module.h>
22 #include <linux/moduleparam.h>
23 #include <linux/usb.h>
24 #include <linux/uaccess.h>
25 #include <linux/usb/serial.h>
26
27 #define DRIVER_DESC "Silicon Labs CP210x RS232 serial adaptor driver"
28
29 /*
30 * Function Prototypes
31 */
32 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *);
33 static void cp210x_close(struct usb_serial_port *);
34 static void cp210x_get_termios(struct tty_struct *, struct usb_serial_port *);
35 static void cp210x_get_termios_port(struct usb_serial_port *port,
36 tcflag_t *cflagp, unsigned int *baudp);
37 static void cp210x_change_speed(struct tty_struct *, struct usb_serial_port *,
38 struct ktermios *);
39 static void cp210x_set_termios(struct tty_struct *, struct usb_serial_port *,
40 struct ktermios*);
41 static bool cp210x_tx_empty(struct usb_serial_port *port);
42 static int cp210x_tiocmget(struct tty_struct *);
43 static int cp210x_tiocmset(struct tty_struct *, unsigned int, unsigned int);
44 static int cp210x_tiocmset_port(struct usb_serial_port *port,
45 unsigned int, unsigned int);
46 static void cp210x_break_ctl(struct tty_struct *, int);
47 static int cp210x_port_probe(struct usb_serial_port *);
48 static int cp210x_port_remove(struct usb_serial_port *);
49 static void cp210x_dtr_rts(struct usb_serial_port *p, int on);
50
51 static const struct usb_device_id id_table[] = {
52 { USB_DEVICE(0x045B, 0x0053) }, /* Renesas RX610 RX-Stick */
53 { USB_DEVICE(0x0471, 0x066A) }, /* AKTAKOM ACE-1001 cable */
54 { USB_DEVICE(0x0489, 0xE000) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
55 { USB_DEVICE(0x0489, 0xE003) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
56 { USB_DEVICE(0x0745, 0x1000) }, /* CipherLab USB CCD Barcode Scanner 1000 */
57 { USB_DEVICE(0x0846, 0x1100) }, /* NetGear Managed Switch M4100 series, M5300 series, M7100 series */
58 { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */
59 { USB_DEVICE(0x08FD, 0x000A) }, /* Digianswer A/S , ZigBee/802.15.4 MAC Device */
60 { USB_DEVICE(0x0908, 0x01FF) }, /* Siemens RUGGEDCOM USB Serial Console */
61 { USB_DEVICE(0x0BED, 0x1100) }, /* MEI (TM) Cashflow-SC Bill/Voucher Acceptor */
62 { USB_DEVICE(0x0BED, 0x1101) }, /* MEI series 2000 Combo Acceptor */
63 { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
64 { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */
65 { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */
66 { USB_DEVICE(0x0FDE, 0xCA05) }, /* OWL Wireless Electricity Monitor CM-160 */
67 { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
68 { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
69 { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */
70 { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */
71 { USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */
72 { USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */
73 { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */
74 { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
75 { USB_DEVICE(0x10C4, 0x8044) }, /* Cygnal Debug Adapter */
76 { USB_DEVICE(0x10C4, 0x804E) }, /* Software Bisque Paramount ME build-in converter */
77 { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */
78 { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */
79 { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
80 { USB_DEVICE(0x10C4, 0x806F) }, /* IMS USB to RS422 Converter Cable */
81 { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
82 { USB_DEVICE(0x10C4, 0x80C4) }, /* Cygnal Integrated Products, Inc., Optris infrared thermometer */
83 { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
84 { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */
85 { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
86 { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */
87 { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
88 { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */
89 { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
90 { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */
91 { USB_DEVICE(0x2405, 0x0003) }, /* West Mountain Radio RIGblaster Advantage */
92 { USB_DEVICE(0x10C4, 0x8156) }, /* B&G H3000 link cable */
93 { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
94 { USB_DEVICE(0x10C4, 0x815F) }, /* Timewave HamLinkUSB */
95 { USB_DEVICE(0x10C4, 0x817C) }, /* CESINEL MEDCAL N Power Quality Monitor */
96 { USB_DEVICE(0x10C4, 0x817D) }, /* CESINEL MEDCAL NT Power Quality Monitor */
97 { USB_DEVICE(0x10C4, 0x817E) }, /* CESINEL MEDCAL S Power Quality Monitor */
98 { USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */
99 { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */
100 { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */
101 { USB_DEVICE(0x10C4, 0x81A9) }, /* Multiplex RC Interface */
102 { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */
103 { USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */
104 { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
105 { USB_DEVICE(0x10C4, 0x81D7) }, /* IAI Corp. RCB-CV-USB USB to RS485 Adaptor */
106 { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
107 { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */
108 { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */
109 { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */
110 { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
111 { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */
112 { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */
113 { USB_DEVICE(0x10C4, 0x8281) }, /* Nanotec Plug & Drive */
114 { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesis ETRX2USB */
115 { USB_DEVICE(0x10C4, 0x82EF) }, /* CESINEL FALCO 6105 AC Power Supply */
116 { USB_DEVICE(0x10C4, 0x82F1) }, /* CESINEL MEDCAL EFD Earth Fault Detector */
117 { USB_DEVICE(0x10C4, 0x82F2) }, /* CESINEL MEDCAL ST Network Analyzer */
118 { USB_DEVICE(0x10C4, 0x82F4) }, /* Starizona MicroTouch */
119 { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */
120 { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */
121 { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */
122 { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */
123 { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */
124 { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */
125 { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */
126 { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */
127 { USB_DEVICE(0x10C4, 0x8470) }, /* Juniper Networks BX Series System Console */
128 { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */
129 { USB_DEVICE(0x10C4, 0x84B6) }, /* Starizona Hyperion */
130 { USB_DEVICE(0x10C4, 0x851E) }, /* CESINEL MEDCAL PT Network Analyzer */
131 { USB_DEVICE(0x10C4, 0x85A7) }, /* LifeScan OneTouch Verio IQ */
132 { USB_DEVICE(0x10C4, 0x85B8) }, /* CESINEL ReCon T Energy Logger */
133 { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */
134 { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */
135 { USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */
136 { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */
137 { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */
138 { USB_DEVICE(0x10C4, 0x8856) }, /* CEL EM357 ZigBee USB Stick - LR */
139 { USB_DEVICE(0x10C4, 0x8857) }, /* CEL EM357 ZigBee USB Stick */
140 { USB_DEVICE(0x10C4, 0x88A4) }, /* MMB Networks ZigBee USB Device */
141 { USB_DEVICE(0x10C4, 0x88A5) }, /* Planet Innovation Ingeni ZigBee USB Device */
142 { USB_DEVICE(0x10C4, 0x88FB) }, /* CESINEL MEDCAL STII Network Analyzer */
143 { USB_DEVICE(0x10C4, 0x8938) }, /* CESINEL MEDCAL S II Network Analyzer */
144 { USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */
145 { USB_DEVICE(0x10C4, 0x8962) }, /* Brim Brothers charging dock */
146 { USB_DEVICE(0x10C4, 0x8977) }, /* CEL MeshWorks DevKit Device */
147 { USB_DEVICE(0x10C4, 0x8998) }, /* KCF Technologies PRN */
148 { USB_DEVICE(0x10C4, 0x89A4) }, /* CESINEL FTBC Flexible Thyristor Bridge Controller */
149 { USB_DEVICE(0x10C4, 0x89FB) }, /* Qivicon ZigBee USB Radio Stick */
150 { USB_DEVICE(0x10C4, 0x8A2A) }, /* HubZ dual ZigBee and Z-Wave dongle */
151 { USB_DEVICE(0x10C4, 0x8A5E) }, /* CEL EM3588 ZigBee USB Stick Long Range */
152 { USB_DEVICE(0x10C4, 0x8B34) }, /* Qivicon ZigBee USB Radio Stick */
153 { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
154 { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
155 { USB_DEVICE(0x10C4, 0xEA63) }, /* Silicon Labs Windows Update (CP2101-4/CP2102N) */
156 { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */
157 { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */
158 { USB_DEVICE(0x10C4, 0xEA7A) }, /* Silicon Labs Windows Update (CP2105) */
159 { USB_DEVICE(0x10C4, 0xEA7B) }, /* Silicon Labs Windows Update (CP2108) */
160 { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
161 { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
162 { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
163 { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
164 { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
165 { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */
166 { USB_DEVICE(0x12B8, 0xEC60) }, /* Link G4 ECU */
167 { USB_DEVICE(0x12B8, 0xEC62) }, /* Link G4+ ECU */
168 { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
169 { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */
170 { USB_DEVICE(0x155A, 0x1006) }, /* ELDAT Easywave RX09 */
171 { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */
172 { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */
173 { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
174 { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */
175 { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */
176 { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */
177 { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */
178 { USB_DEVICE(0x16C0, 0x09B0) }, /* Lunatico Seletek */
179 { USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */
180 { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
181 { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */
182 { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */
183 { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */
184 { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */
185 { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */
186 { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */
187 { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */
188 { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */
189 { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
190 { USB_DEVICE(0x18EF, 0xE025) }, /* ELV Marble Sound Board 1 */
191 { USB_DEVICE(0x18EF, 0xE030) }, /* ELV ALC 8xxx Battery Charger */
192 { USB_DEVICE(0x18EF, 0xE032) }, /* ELV TFD500 Data Logger */
193 { USB_DEVICE(0x1901, 0x0190) }, /* GE B850 CP2105 Recorder interface */
194 { USB_DEVICE(0x1901, 0x0193) }, /* GE B650 CP2104 PMC interface */
195 { USB_DEVICE(0x1901, 0x0194) }, /* GE Healthcare Remote Alarm Box */
196 { USB_DEVICE(0x1901, 0x0195) }, /* GE B850/B650/B450 CP2104 DP UART interface */
197 { USB_DEVICE(0x1901, 0x0196) }, /* GE B850 CP2105 DP UART interface */
198 { USB_DEVICE(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */
199 { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */
200 { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */
201 { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */
202 { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */
203 { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */
204 { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */
205 { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */
206 { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */
207 { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */
208 { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */
209 { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */
210 { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */
211 { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */
212 { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */
213 { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */
214 { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */
215 { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */
216 { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */
217 { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */
218 { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */
219 { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */
220 { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */
221 { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */
222 { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */
223 { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */
224 { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */
225 { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */
226 { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */
227 { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */
228 { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */
229 { USB_DEVICE(0x3923, 0x7A0B) }, /* National Instruments USB Serial Console */
230 { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */
231 { } /* Terminating Entry */
232 };
233
234 MODULE_DEVICE_TABLE(usb, id_table);
235
236 struct cp210x_port_private {
237 __u8 bInterfaceNumber;
238 bool has_swapped_line_ctl;
239 };
240
241 static struct usb_serial_driver cp210x_device = {
242 .driver = {
243 .owner = THIS_MODULE,
244 .name = "cp210x",
245 },
246 .id_table = id_table,
247 .num_ports = 1,
248 .bulk_in_size = 256,
249 .bulk_out_size = 256,
250 .open = cp210x_open,
251 .close = cp210x_close,
252 .break_ctl = cp210x_break_ctl,
253 .set_termios = cp210x_set_termios,
254 .tx_empty = cp210x_tx_empty,
255 .tiocmget = cp210x_tiocmget,
256 .tiocmset = cp210x_tiocmset,
257 .port_probe = cp210x_port_probe,
258 .port_remove = cp210x_port_remove,
259 .dtr_rts = cp210x_dtr_rts
260 };
261
262 static struct usb_serial_driver * const serial_drivers[] = {
263 &cp210x_device, NULL
264 };
265
266 /* Config request types */
267 #define REQTYPE_HOST_TO_INTERFACE 0x41
268 #define REQTYPE_INTERFACE_TO_HOST 0xc1
269 #define REQTYPE_HOST_TO_DEVICE 0x40
270 #define REQTYPE_DEVICE_TO_HOST 0xc0
271
272 /* Config request codes */
273 #define CP210X_IFC_ENABLE 0x00
274 #define CP210X_SET_BAUDDIV 0x01
275 #define CP210X_GET_BAUDDIV 0x02
276 #define CP210X_SET_LINE_CTL 0x03
277 #define CP210X_GET_LINE_CTL 0x04
278 #define CP210X_SET_BREAK 0x05
279 #define CP210X_IMM_CHAR 0x06
280 #define CP210X_SET_MHS 0x07
281 #define CP210X_GET_MDMSTS 0x08
282 #define CP210X_SET_XON 0x09
283 #define CP210X_SET_XOFF 0x0A
284 #define CP210X_SET_EVENTMASK 0x0B
285 #define CP210X_GET_EVENTMASK 0x0C
286 #define CP210X_SET_CHAR 0x0D
287 #define CP210X_GET_CHARS 0x0E
288 #define CP210X_GET_PROPS 0x0F
289 #define CP210X_GET_COMM_STATUS 0x10
290 #define CP210X_RESET 0x11
291 #define CP210X_PURGE 0x12
292 #define CP210X_SET_FLOW 0x13
293 #define CP210X_GET_FLOW 0x14
294 #define CP210X_EMBED_EVENTS 0x15
295 #define CP210X_GET_EVENTSTATE 0x16
296 #define CP210X_SET_CHARS 0x19
297 #define CP210X_GET_BAUDRATE 0x1D
298 #define CP210X_SET_BAUDRATE 0x1E
299
300 /* CP210X_IFC_ENABLE */
301 #define UART_ENABLE 0x0001
302 #define UART_DISABLE 0x0000
303
304 /* CP210X_(SET|GET)_BAUDDIV */
305 #define BAUD_RATE_GEN_FREQ 0x384000
306
307 /* CP210X_(SET|GET)_LINE_CTL */
308 #define BITS_DATA_MASK 0X0f00
309 #define BITS_DATA_5 0X0500
310 #define BITS_DATA_6 0X0600
311 #define BITS_DATA_7 0X0700
312 #define BITS_DATA_8 0X0800
313 #define BITS_DATA_9 0X0900
314
315 #define BITS_PARITY_MASK 0x00f0
316 #define BITS_PARITY_NONE 0x0000
317 #define BITS_PARITY_ODD 0x0010
318 #define BITS_PARITY_EVEN 0x0020
319 #define BITS_PARITY_MARK 0x0030
320 #define BITS_PARITY_SPACE 0x0040
321
322 #define BITS_STOP_MASK 0x000f
323 #define BITS_STOP_1 0x0000
324 #define BITS_STOP_1_5 0x0001
325 #define BITS_STOP_2 0x0002
326
327 /* CP210X_SET_BREAK */
328 #define BREAK_ON 0x0001
329 #define BREAK_OFF 0x0000
330
331 /* CP210X_(SET_MHS|GET_MDMSTS) */
332 #define CONTROL_DTR 0x0001
333 #define CONTROL_RTS 0x0002
334 #define CONTROL_CTS 0x0010
335 #define CONTROL_DSR 0x0020
336 #define CONTROL_RING 0x0040
337 #define CONTROL_DCD 0x0080
338 #define CONTROL_WRITE_DTR 0x0100
339 #define CONTROL_WRITE_RTS 0x0200
340
341 /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */
342 struct cp210x_comm_status {
343 __le32 ulErrors;
344 __le32 ulHoldReasons;
345 __le32 ulAmountInInQueue;
346 __le32 ulAmountInOutQueue;
347 u8 bEofReceived;
348 u8 bWaitForImmediate;
349 u8 bReserved;
350 } __packed;
351
352 /*
353 * CP210X_PURGE - 16 bits passed in wValue of USB request.
354 * SiLabs app note AN571 gives a strange description of the 4 bits:
355 * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive.
356 * writing 1 to all, however, purges cp2108 well enough to avoid the hang.
357 */
358 #define PURGE_ALL 0x000f
359
360 /* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */
361 struct cp210x_flow_ctl {
362 __le32 ulControlHandshake;
363 __le32 ulFlowReplace;
364 __le32 ulXonLimit;
365 __le32 ulXoffLimit;
366 } __packed;
367
368 /* cp210x_flow_ctl::ulControlHandshake */
369 #define CP210X_SERIAL_DTR_MASK GENMASK(1, 0)
370 #define CP210X_SERIAL_DTR_SHIFT(_mode) (_mode)
371 #define CP210X_SERIAL_CTS_HANDSHAKE BIT(3)
372 #define CP210X_SERIAL_DSR_HANDSHAKE BIT(4)
373 #define CP210X_SERIAL_DCD_HANDSHAKE BIT(5)
374 #define CP210X_SERIAL_DSR_SENSITIVITY BIT(6)
375
376 /* values for cp210x_flow_ctl::ulControlHandshake::CP210X_SERIAL_DTR_MASK */
377 #define CP210X_SERIAL_DTR_INACTIVE 0
378 #define CP210X_SERIAL_DTR_ACTIVE 1
379 #define CP210X_SERIAL_DTR_FLOW_CTL 2
380
381 /* cp210x_flow_ctl::ulFlowReplace */
382 #define CP210X_SERIAL_AUTO_TRANSMIT BIT(0)
383 #define CP210X_SERIAL_AUTO_RECEIVE BIT(1)
384 #define CP210X_SERIAL_ERROR_CHAR BIT(2)
385 #define CP210X_SERIAL_NULL_STRIPPING BIT(3)
386 #define CP210X_SERIAL_BREAK_CHAR BIT(4)
387 #define CP210X_SERIAL_RTS_MASK GENMASK(7, 6)
388 #define CP210X_SERIAL_RTS_SHIFT(_mode) (_mode << 6)
389 #define CP210X_SERIAL_XOFF_CONTINUE BIT(31)
390
391 /* values for cp210x_flow_ctl::ulFlowReplace::CP210X_SERIAL_RTS_MASK */
392 #define CP210X_SERIAL_RTS_INACTIVE 0
393 #define CP210X_SERIAL_RTS_ACTIVE 1
394 #define CP210X_SERIAL_RTS_FLOW_CTL 2
395
396 /*
397 * Reads a variable-sized block of CP210X_ registers, identified by req.
398 * Returns data into buf in native USB byte order.
399 */
400 static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req,
401 void *buf, int bufsize)
402 {
403 struct usb_serial *serial = port->serial;
404 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
405 void *dmabuf;
406 int result;
407
408 dmabuf = kmalloc(bufsize, GFP_KERNEL);
409 if (!dmabuf) {
410 /*
411 * FIXME Some callers don't bother to check for error,
412 * at least give them consistent junk until they are fixed
413 */
414 memset(buf, 0, bufsize);
415 return -ENOMEM;
416 }
417
418 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
419 req, REQTYPE_INTERFACE_TO_HOST, 0,
420 port_priv->bInterfaceNumber, dmabuf, bufsize,
421 USB_CTRL_SET_TIMEOUT);
422 if (result == bufsize) {
423 memcpy(buf, dmabuf, bufsize);
424 result = 0;
425 } else {
426 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n",
427 req, bufsize, result);
428 if (result >= 0)
429 result = -EPROTO;
430
431 /*
432 * FIXME Some callers don't bother to check for error,
433 * at least give them consistent junk until they are fixed
434 */
435 memset(buf, 0, bufsize);
436 }
437
438 kfree(dmabuf);
439
440 return result;
441 }
442
443 /*
444 * Reads any 32-bit CP210X_ register identified by req.
445 */
446 static int cp210x_read_u32_reg(struct usb_serial_port *port, u8 req, u32 *val)
447 {
448 __le32 le32_val;
449 int err;
450
451 err = cp210x_read_reg_block(port, req, &le32_val, sizeof(le32_val));
452 if (err) {
453 /*
454 * FIXME Some callers don't bother to check for error,
455 * at least give them consistent junk until they are fixed
456 */
457 *val = 0;
458 return err;
459 }
460
461 *val = le32_to_cpu(le32_val);
462
463 return 0;
464 }
465
466 /*
467 * Reads any 16-bit CP210X_ register identified by req.
468 */
469 static int cp210x_read_u16_reg(struct usb_serial_port *port, u8 req, u16 *val)
470 {
471 __le16 le16_val;
472 int err;
473
474 err = cp210x_read_reg_block(port, req, &le16_val, sizeof(le16_val));
475 if (err)
476 return err;
477
478 *val = le16_to_cpu(le16_val);
479
480 return 0;
481 }
482
483 /*
484 * Reads any 8-bit CP210X_ register identified by req.
485 */
486 static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val)
487 {
488 return cp210x_read_reg_block(port, req, val, sizeof(*val));
489 }
490
491 /*
492 * Writes any 16-bit CP210X_ register (req) whose value is passed
493 * entirely in the wValue field of the USB request.
494 */
495 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val)
496 {
497 struct usb_serial *serial = port->serial;
498 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
499 int result;
500
501 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
502 req, REQTYPE_HOST_TO_INTERFACE, val,
503 port_priv->bInterfaceNumber, NULL, 0,
504 USB_CTRL_SET_TIMEOUT);
505 if (result < 0) {
506 dev_err(&port->dev, "failed set request 0x%x status: %d\n",
507 req, result);
508 }
509
510 return result;
511 }
512
513 /*
514 * Writes a variable-sized block of CP210X_ registers, identified by req.
515 * Data in buf must be in native USB byte order.
516 */
517 static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req,
518 void *buf, int bufsize)
519 {
520 struct usb_serial *serial = port->serial;
521 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
522 void *dmabuf;
523 int result;
524
525 dmabuf = kmemdup(buf, bufsize, GFP_KERNEL);
526 if (!dmabuf)
527 return -ENOMEM;
528
529 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
530 req, REQTYPE_HOST_TO_INTERFACE, 0,
531 port_priv->bInterfaceNumber, dmabuf, bufsize,
532 USB_CTRL_SET_TIMEOUT);
533
534 kfree(dmabuf);
535
536 if (result == bufsize) {
537 result = 0;
538 } else {
539 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n",
540 req, bufsize, result);
541 if (result >= 0)
542 result = -EPROTO;
543 }
544
545 return result;
546 }
547
548 /*
549 * Writes any 32-bit CP210X_ register identified by req.
550 */
551 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val)
552 {
553 __le32 le32_val;
554
555 le32_val = cpu_to_le32(val);
556
557 return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val));
558 }
559
560 /*
561 * Detect CP2108 GET_LINE_CTL bug and activate workaround.
562 * Write a known good value 0x800, read it back.
563 * If it comes back swapped the bug is detected.
564 * Preserve the original register value.
565 */
566 static int cp210x_detect_swapped_line_ctl(struct usb_serial_port *port)
567 {
568 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
569 u16 line_ctl_save;
570 u16 line_ctl_test;
571 int err;
572
573 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_save);
574 if (err)
575 return err;
576
577 err = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, 0x800);
578 if (err)
579 return err;
580
581 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_test);
582 if (err)
583 return err;
584
585 if (line_ctl_test == 8) {
586 port_priv->has_swapped_line_ctl = true;
587 line_ctl_save = swab16(line_ctl_save);
588 }
589
590 return cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, line_ctl_save);
591 }
592
593 /*
594 * Must always be called instead of cp210x_read_u16_reg(CP210X_GET_LINE_CTL)
595 * to workaround cp2108 bug and get correct value.
596 */
597 static int cp210x_get_line_ctl(struct usb_serial_port *port, u16 *ctl)
598 {
599 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
600 int err;
601
602 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, ctl);
603 if (err)
604 return err;
605
606 /* Workaround swapped bytes in 16-bit value from CP210X_GET_LINE_CTL */
607 if (port_priv->has_swapped_line_ctl)
608 *ctl = swab16(*ctl);
609
610 return 0;
611 }
612
613 /*
614 * cp210x_quantise_baudrate
615 * Quantises the baud rate as per AN205 Table 1
616 */
617 static unsigned int cp210x_quantise_baudrate(unsigned int baud)
618 {
619 if (baud <= 300)
620 baud = 300;
621 else if (baud <= 600) baud = 600;
622 else if (baud <= 1200) baud = 1200;
623 else if (baud <= 1800) baud = 1800;
624 else if (baud <= 2400) baud = 2400;
625 else if (baud <= 4000) baud = 4000;
626 else if (baud <= 4803) baud = 4800;
627 else if (baud <= 7207) baud = 7200;
628 else if (baud <= 9612) baud = 9600;
629 else if (baud <= 14428) baud = 14400;
630 else if (baud <= 16062) baud = 16000;
631 else if (baud <= 19250) baud = 19200;
632 else if (baud <= 28912) baud = 28800;
633 else if (baud <= 38601) baud = 38400;
634 else if (baud <= 51558) baud = 51200;
635 else if (baud <= 56280) baud = 56000;
636 else if (baud <= 58053) baud = 57600;
637 else if (baud <= 64111) baud = 64000;
638 else if (baud <= 77608) baud = 76800;
639 else if (baud <= 117028) baud = 115200;
640 else if (baud <= 129347) baud = 128000;
641 else if (baud <= 156868) baud = 153600;
642 else if (baud <= 237832) baud = 230400;
643 else if (baud <= 254234) baud = 250000;
644 else if (baud <= 273066) baud = 256000;
645 else if (baud <= 491520) baud = 460800;
646 else if (baud <= 567138) baud = 500000;
647 else if (baud <= 670254) baud = 576000;
648 else if (baud < 1000000)
649 baud = 921600;
650 else if (baud > 2000000)
651 baud = 2000000;
652 return baud;
653 }
654
655 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
656 {
657 int result;
658
659 result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE);
660 if (result) {
661 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__);
662 return result;
663 }
664
665 /* Configure the termios structure */
666 cp210x_get_termios(tty, port);
667
668 /* The baud rate must be initialised on cp2104 */
669 if (tty)
670 cp210x_change_speed(tty, port, NULL);
671
672 return usb_serial_generic_open(tty, port);
673 }
674
675 static void cp210x_close(struct usb_serial_port *port)
676 {
677 usb_serial_generic_close(port);
678
679 /* Clear both queues; cp2108 needs this to avoid an occasional hang */
680 cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL);
681
682 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
683 }
684
685 /*
686 * Read how many bytes are waiting in the TX queue.
687 */
688 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port,
689 u32 *count)
690 {
691 struct usb_serial *serial = port->serial;
692 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
693 struct cp210x_comm_status *sts;
694 int result;
695
696 sts = kmalloc(sizeof(*sts), GFP_KERNEL);
697 if (!sts)
698 return -ENOMEM;
699
700 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
701 CP210X_GET_COMM_STATUS, REQTYPE_INTERFACE_TO_HOST,
702 0, port_priv->bInterfaceNumber, sts, sizeof(*sts),
703 USB_CTRL_GET_TIMEOUT);
704 if (result == sizeof(*sts)) {
705 *count = le32_to_cpu(sts->ulAmountInOutQueue);
706 result = 0;
707 } else {
708 dev_err(&port->dev, "failed to get comm status: %d\n", result);
709 if (result >= 0)
710 result = -EPROTO;
711 }
712
713 kfree(sts);
714
715 return result;
716 }
717
718 static bool cp210x_tx_empty(struct usb_serial_port *port)
719 {
720 int err;
721 u32 count;
722
723 err = cp210x_get_tx_queue_byte_count(port, &count);
724 if (err)
725 return true;
726
727 return !count;
728 }
729
730 /*
731 * cp210x_get_termios
732 * Reads the baud rate, data bits, parity, stop bits and flow control mode
733 * from the device, corrects any unsupported values, and configures the
734 * termios structure to reflect the state of the device
735 */
736 static void cp210x_get_termios(struct tty_struct *tty,
737 struct usb_serial_port *port)
738 {
739 unsigned int baud;
740
741 if (tty) {
742 cp210x_get_termios_port(tty->driver_data,
743 &tty->termios.c_cflag, &baud);
744 tty_encode_baud_rate(tty, baud, baud);
745 } else {
746 tcflag_t cflag;
747 cflag = 0;
748 cp210x_get_termios_port(port, &cflag, &baud);
749 }
750 }
751
752 /*
753 * cp210x_get_termios_port
754 * This is the heart of cp210x_get_termios which always uses a &usb_serial_port.
755 */
756 static void cp210x_get_termios_port(struct usb_serial_port *port,
757 tcflag_t *cflagp, unsigned int *baudp)
758 {
759 struct device *dev = &port->dev;
760 tcflag_t cflag;
761 struct cp210x_flow_ctl flow_ctl;
762 u32 baud;
763 u16 bits;
764 u32 ctl_hs;
765
766 cp210x_read_u32_reg(port, CP210X_GET_BAUDRATE, &baud);
767
768 dev_dbg(dev, "%s - baud rate = %d\n", __func__, baud);
769 *baudp = baud;
770
771 cflag = *cflagp;
772
773 cp210x_get_line_ctl(port, &bits);
774 cflag &= ~CSIZE;
775 switch (bits & BITS_DATA_MASK) {
776 case BITS_DATA_5:
777 dev_dbg(dev, "%s - data bits = 5\n", __func__);
778 cflag |= CS5;
779 break;
780 case BITS_DATA_6:
781 dev_dbg(dev, "%s - data bits = 6\n", __func__);
782 cflag |= CS6;
783 break;
784 case BITS_DATA_7:
785 dev_dbg(dev, "%s - data bits = 7\n", __func__);
786 cflag |= CS7;
787 break;
788 case BITS_DATA_8:
789 dev_dbg(dev, "%s - data bits = 8\n", __func__);
790 cflag |= CS8;
791 break;
792 case BITS_DATA_9:
793 dev_dbg(dev, "%s - data bits = 9 (not supported, using 8 data bits)\n", __func__);
794 cflag |= CS8;
795 bits &= ~BITS_DATA_MASK;
796 bits |= BITS_DATA_8;
797 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
798 break;
799 default:
800 dev_dbg(dev, "%s - Unknown number of data bits, using 8\n", __func__);
801 cflag |= CS8;
802 bits &= ~BITS_DATA_MASK;
803 bits |= BITS_DATA_8;
804 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
805 break;
806 }
807
808 switch (bits & BITS_PARITY_MASK) {
809 case BITS_PARITY_NONE:
810 dev_dbg(dev, "%s - parity = NONE\n", __func__);
811 cflag &= ~PARENB;
812 break;
813 case BITS_PARITY_ODD:
814 dev_dbg(dev, "%s - parity = ODD\n", __func__);
815 cflag |= (PARENB|PARODD);
816 break;
817 case BITS_PARITY_EVEN:
818 dev_dbg(dev, "%s - parity = EVEN\n", __func__);
819 cflag &= ~PARODD;
820 cflag |= PARENB;
821 break;
822 case BITS_PARITY_MARK:
823 dev_dbg(dev, "%s - parity = MARK\n", __func__);
824 cflag |= (PARENB|PARODD|CMSPAR);
825 break;
826 case BITS_PARITY_SPACE:
827 dev_dbg(dev, "%s - parity = SPACE\n", __func__);
828 cflag &= ~PARODD;
829 cflag |= (PARENB|CMSPAR);
830 break;
831 default:
832 dev_dbg(dev, "%s - Unknown parity mode, disabling parity\n", __func__);
833 cflag &= ~PARENB;
834 bits &= ~BITS_PARITY_MASK;
835 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
836 break;
837 }
838
839 cflag &= ~CSTOPB;
840 switch (bits & BITS_STOP_MASK) {
841 case BITS_STOP_1:
842 dev_dbg(dev, "%s - stop bits = 1\n", __func__);
843 break;
844 case BITS_STOP_1_5:
845 dev_dbg(dev, "%s - stop bits = 1.5 (not supported, using 1 stop bit)\n", __func__);
846 bits &= ~BITS_STOP_MASK;
847 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
848 break;
849 case BITS_STOP_2:
850 dev_dbg(dev, "%s - stop bits = 2\n", __func__);
851 cflag |= CSTOPB;
852 break;
853 default:
854 dev_dbg(dev, "%s - Unknown number of stop bits, using 1 stop bit\n", __func__);
855 bits &= ~BITS_STOP_MASK;
856 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
857 break;
858 }
859
860 cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
861 sizeof(flow_ctl));
862 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
863 if (ctl_hs & CP210X_SERIAL_CTS_HANDSHAKE) {
864 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
865 cflag |= CRTSCTS;
866 } else {
867 dev_dbg(dev, "%s - flow control = NONE\n", __func__);
868 cflag &= ~CRTSCTS;
869 }
870
871 *cflagp = cflag;
872 }
873
874 /*
875 * CP2101 supports the following baud rates:
876 *
877 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800,
878 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600
879 *
880 * CP2102 and CP2103 support the following additional rates:
881 *
882 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000,
883 * 576000
884 *
885 * The device will map a requested rate to a supported one, but the result
886 * of requests for rates greater than 1053257 is undefined (see AN205).
887 *
888 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud,
889 * respectively, with an error less than 1%. The actual rates are determined
890 * by
891 *
892 * div = round(freq / (2 x prescale x request))
893 * actual = freq / (2 x prescale x div)
894 *
895 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps
896 * or 1 otherwise.
897 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1
898 * otherwise.
899 */
900 static void cp210x_change_speed(struct tty_struct *tty,
901 struct usb_serial_port *port, struct ktermios *old_termios)
902 {
903 u32 baud;
904
905 baud = tty->termios.c_ospeed;
906
907 /* This maps the requested rate to a rate valid on cp2102 or cp2103,
908 * or to an arbitrary rate in [1M,2M].
909 *
910 * NOTE: B0 is not implemented.
911 */
912 baud = cp210x_quantise_baudrate(baud);
913
914 dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud);
915 if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) {
916 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud);
917 if (old_termios)
918 baud = old_termios->c_ospeed;
919 else
920 baud = 9600;
921 }
922
923 tty_encode_baud_rate(tty, baud, baud);
924 }
925
926 static void cp210x_set_termios(struct tty_struct *tty,
927 struct usb_serial_port *port, struct ktermios *old_termios)
928 {
929 struct device *dev = &port->dev;
930 unsigned int cflag, old_cflag;
931 u16 bits;
932
933 cflag = tty->termios.c_cflag;
934 old_cflag = old_termios->c_cflag;
935
936 if (tty->termios.c_ospeed != old_termios->c_ospeed)
937 cp210x_change_speed(tty, port, old_termios);
938
939 /* If the number of data bits is to be updated */
940 if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
941 cp210x_get_line_ctl(port, &bits);
942 bits &= ~BITS_DATA_MASK;
943 switch (cflag & CSIZE) {
944 case CS5:
945 bits |= BITS_DATA_5;
946 dev_dbg(dev, "%s - data bits = 5\n", __func__);
947 break;
948 case CS6:
949 bits |= BITS_DATA_6;
950 dev_dbg(dev, "%s - data bits = 6\n", __func__);
951 break;
952 case CS7:
953 bits |= BITS_DATA_7;
954 dev_dbg(dev, "%s - data bits = 7\n", __func__);
955 break;
956 case CS8:
957 bits |= BITS_DATA_8;
958 dev_dbg(dev, "%s - data bits = 8\n", __func__);
959 break;
960 /*case CS9:
961 bits |= BITS_DATA_9;
962 dev_dbg(dev, "%s - data bits = 9\n", __func__);
963 break;*/
964 default:
965 dev_dbg(dev, "cp210x driver does not support the number of bits requested, using 8 bit mode\n");
966 bits |= BITS_DATA_8;
967 break;
968 }
969 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
970 dev_dbg(dev, "Number of data bits requested not supported by device\n");
971 }
972
973 if ((cflag & (PARENB|PARODD|CMSPAR)) !=
974 (old_cflag & (PARENB|PARODD|CMSPAR))) {
975 cp210x_get_line_ctl(port, &bits);
976 bits &= ~BITS_PARITY_MASK;
977 if (cflag & PARENB) {
978 if (cflag & CMSPAR) {
979 if (cflag & PARODD) {
980 bits |= BITS_PARITY_MARK;
981 dev_dbg(dev, "%s - parity = MARK\n", __func__);
982 } else {
983 bits |= BITS_PARITY_SPACE;
984 dev_dbg(dev, "%s - parity = SPACE\n", __func__);
985 }
986 } else {
987 if (cflag & PARODD) {
988 bits |= BITS_PARITY_ODD;
989 dev_dbg(dev, "%s - parity = ODD\n", __func__);
990 } else {
991 bits |= BITS_PARITY_EVEN;
992 dev_dbg(dev, "%s - parity = EVEN\n", __func__);
993 }
994 }
995 }
996 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
997 dev_dbg(dev, "Parity mode not supported by device\n");
998 }
999
1000 if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
1001 cp210x_get_line_ctl(port, &bits);
1002 bits &= ~BITS_STOP_MASK;
1003 if (cflag & CSTOPB) {
1004 bits |= BITS_STOP_2;
1005 dev_dbg(dev, "%s - stop bits = 2\n", __func__);
1006 } else {
1007 bits |= BITS_STOP_1;
1008 dev_dbg(dev, "%s - stop bits = 1\n", __func__);
1009 }
1010 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1011 dev_dbg(dev, "Number of stop bits requested not supported by device\n");
1012 }
1013
1014 if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
1015 struct cp210x_flow_ctl flow_ctl;
1016 u32 ctl_hs;
1017 u32 flow_repl;
1018
1019 cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
1020 sizeof(flow_ctl));
1021 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1022 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
1023 dev_dbg(dev, "%s - read ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n",
1024 __func__, ctl_hs, flow_repl);
1025
1026 ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE;
1027 ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE;
1028 ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY;
1029 ctl_hs &= ~CP210X_SERIAL_DTR_MASK;
1030 ctl_hs |= CP210X_SERIAL_DTR_SHIFT(CP210X_SERIAL_DTR_ACTIVE);
1031 if (cflag & CRTSCTS) {
1032 ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE;
1033
1034 flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1035 flow_repl |= CP210X_SERIAL_RTS_SHIFT(
1036 CP210X_SERIAL_RTS_FLOW_CTL);
1037 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
1038 } else {
1039 ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE;
1040
1041 flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1042 flow_repl |= CP210X_SERIAL_RTS_SHIFT(
1043 CP210X_SERIAL_RTS_ACTIVE);
1044 dev_dbg(dev, "%s - flow control = NONE\n", __func__);
1045 }
1046
1047 dev_dbg(dev, "%s - write ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n",
1048 __func__, ctl_hs, flow_repl);
1049 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs);
1050 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1051 cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl,
1052 sizeof(flow_ctl));
1053 }
1054
1055 }
1056
1057 static int cp210x_tiocmset(struct tty_struct *tty,
1058 unsigned int set, unsigned int clear)
1059 {
1060 struct usb_serial_port *port = tty->driver_data;
1061 return cp210x_tiocmset_port(port, set, clear);
1062 }
1063
1064 static int cp210x_tiocmset_port(struct usb_serial_port *port,
1065 unsigned int set, unsigned int clear)
1066 {
1067 u16 control = 0;
1068
1069 if (set & TIOCM_RTS) {
1070 control |= CONTROL_RTS;
1071 control |= CONTROL_WRITE_RTS;
1072 }
1073 if (set & TIOCM_DTR) {
1074 control |= CONTROL_DTR;
1075 control |= CONTROL_WRITE_DTR;
1076 }
1077 if (clear & TIOCM_RTS) {
1078 control &= ~CONTROL_RTS;
1079 control |= CONTROL_WRITE_RTS;
1080 }
1081 if (clear & TIOCM_DTR) {
1082 control &= ~CONTROL_DTR;
1083 control |= CONTROL_WRITE_DTR;
1084 }
1085
1086 dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control);
1087
1088 return cp210x_write_u16_reg(port, CP210X_SET_MHS, control);
1089 }
1090
1091 static void cp210x_dtr_rts(struct usb_serial_port *p, int on)
1092 {
1093 if (on)
1094 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0);
1095 else
1096 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS);
1097 }
1098
1099 static int cp210x_tiocmget(struct tty_struct *tty)
1100 {
1101 struct usb_serial_port *port = tty->driver_data;
1102 u8 control;
1103 int result;
1104
1105 result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control);
1106 if (result)
1107 return result;
1108
1109 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
1110 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
1111 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
1112 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
1113 |((control & CONTROL_RING)? TIOCM_RI : 0)
1114 |((control & CONTROL_DCD) ? TIOCM_CD : 0);
1115
1116 dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control);
1117
1118 return result;
1119 }
1120
1121 static void cp210x_break_ctl(struct tty_struct *tty, int break_state)
1122 {
1123 struct usb_serial_port *port = tty->driver_data;
1124 u16 state;
1125
1126 if (break_state == 0)
1127 state = BREAK_OFF;
1128 else
1129 state = BREAK_ON;
1130 dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
1131 state == BREAK_OFF ? "off" : "on");
1132 cp210x_write_u16_reg(port, CP210X_SET_BREAK, state);
1133 }
1134
1135 static int cp210x_port_probe(struct usb_serial_port *port)
1136 {
1137 struct usb_serial *serial = port->serial;
1138 struct usb_host_interface *cur_altsetting;
1139 struct cp210x_port_private *port_priv;
1140 int ret;
1141
1142 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
1143 if (!port_priv)
1144 return -ENOMEM;
1145
1146 cur_altsetting = serial->interface->cur_altsetting;
1147 port_priv->bInterfaceNumber = cur_altsetting->desc.bInterfaceNumber;
1148
1149 usb_set_serial_port_data(port, port_priv);
1150
1151 ret = cp210x_detect_swapped_line_ctl(port);
1152 if (ret) {
1153 kfree(port_priv);
1154 return ret;
1155 }
1156
1157 return 0;
1158 }
1159
1160 static int cp210x_port_remove(struct usb_serial_port *port)
1161 {
1162 struct cp210x_port_private *port_priv;
1163
1164 port_priv = usb_get_serial_port_data(port);
1165 kfree(port_priv);
1166
1167 return 0;
1168 }
1169
1170 module_usb_serial_driver(serial_drivers, id_table);
1171
1172 MODULE_DESCRIPTION(DRIVER_DESC);
1173 MODULE_LICENSE("GPL");
Linux with added FPC-III support