2 * Silicon Laboratories CP210x USB to RS232 serial adaptor driver
4 * Copyright (C) 2005 Craig Shelley (craig@microtron.org.uk)
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.
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
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>
27 #define DRIVER_DESC "Silicon Labs CP210x RS232 serial adaptor driver"
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 *,
39 static void cp210x_set_termios(struct tty_struct *, struct usb_serial_port *,
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);
51 static const struct usb_device_id id_table[] = {
52 { USB_DEVICE(0x0404, 0x034C) }, /* NCR Retail IO Box */
53 { USB_DEVICE(0x045B, 0x0053) }, /* Renesas RX610 RX-Stick */
54 { USB_DEVICE(0x0471, 0x066A) }, /* AKTAKOM ACE-1001 cable */
55 { USB_DEVICE(0x0489, 0xE000) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
56 { USB_DEVICE(0x0489, 0xE003) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
57 { USB_DEVICE(0x0745, 0x1000) }, /* CipherLab USB CCD Barcode Scanner 1000 */
58 { USB_DEVICE(0x0846, 0x1100) }, /* NetGear Managed Switch M4100 series, M5300 series, M7100 series */
59 { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */
60 { USB_DEVICE(0x08FD, 0x000A) }, /* Digianswer A/S , ZigBee/802.15.4 MAC Device */
61 { USB_DEVICE(0x0908, 0x01FF) }, /* Siemens RUGGEDCOM USB Serial Console */
62 { USB_DEVICE(0x0988, 0x0578) }, /* Teraoka AD2000 */
63 { USB_DEVICE(0x0B00, 0x3070) }, /* Ingenico 3070 */
64 { USB_DEVICE(0x0BED, 0x1100) }, /* MEI (TM) Cashflow-SC Bill/Voucher Acceptor */
65 { USB_DEVICE(0x0BED, 0x1101) }, /* MEI series 2000 Combo Acceptor */
66 { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
67 { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */
68 { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */
69 { USB_DEVICE(0x0FDE, 0xCA05) }, /* OWL Wireless Electricity Monitor CM-160 */
70 { USB_DEVICE(0x106F, 0x0003) }, /* CPI / Money Controls Bulk Coin Recycler */
71 { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
72 { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
73 { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */
74 { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */
75 { USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */
76 { USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */
77 { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */
78 { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
79 { USB_DEVICE(0x10C4, 0x8044) }, /* Cygnal Debug Adapter */
80 { USB_DEVICE(0x10C4, 0x804E) }, /* Software Bisque Paramount ME build-in converter */
81 { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */
82 { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */
83 { USB_DEVICE(0x10C4, 0x8056) }, /* Lorenz Messtechnik devices */
84 { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
85 { USB_DEVICE(0x10C4, 0x806F) }, /* IMS USB to RS422 Converter Cable */
86 { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
87 { USB_DEVICE(0x10C4, 0x80C4) }, /* Cygnal Integrated Products, Inc., Optris infrared thermometer */
88 { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
89 { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */
90 { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
91 { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */
92 { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
93 { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */
94 { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
95 { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */
96 { USB_DEVICE(0x2405, 0x0003) }, /* West Mountain Radio RIGblaster Advantage */
97 { USB_DEVICE(0x10C4, 0x8156) }, /* B&G H3000 link cable */
98 { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
99 { USB_DEVICE(0x10C4, 0x815F) }, /* Timewave HamLinkUSB */
100 { USB_DEVICE(0x10C4, 0x817C) }, /* CESINEL MEDCAL N Power Quality Monitor */
101 { USB_DEVICE(0x10C4, 0x817D) }, /* CESINEL MEDCAL NT Power Quality Monitor */
102 { USB_DEVICE(0x10C4, 0x817E) }, /* CESINEL MEDCAL S Power Quality Monitor */
103 { USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */
104 { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */
105 { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */
106 { USB_DEVICE(0x10C4, 0x81A9) }, /* Multiplex RC Interface */
107 { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */
108 { USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */
109 { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
110 { USB_DEVICE(0x10C4, 0x81D7) }, /* IAI Corp. RCB-CV-USB USB to RS485 Adaptor */
111 { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
112 { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */
113 { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */
114 { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */
115 { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
116 { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */
117 { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */
118 { USB_DEVICE(0x10C4, 0x8281) }, /* Nanotec Plug & Drive */
119 { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesis ETRX2USB */
120 { USB_DEVICE(0x10C4, 0x82EF) }, /* CESINEL FALCO 6105 AC Power Supply */
121 { USB_DEVICE(0x10C4, 0x82F1) }, /* CESINEL MEDCAL EFD Earth Fault Detector */
122 { USB_DEVICE(0x10C4, 0x82F2) }, /* CESINEL MEDCAL ST Network Analyzer */
123 { USB_DEVICE(0x10C4, 0x82F4) }, /* Starizona MicroTouch */
124 { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */
125 { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */
126 { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */
127 { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */
128 { USB_DEVICE(0x10C4, 0x83AA) }, /* Mark-10 Digital Force Gauge */
129 { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */
130 { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */
131 { USB_DEVICE(0x10C4, 0x8414) }, /* Decagon USB Cable Adapter */
132 { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */
133 { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */
134 { USB_DEVICE(0x10C4, 0x8470) }, /* Juniper Networks BX Series System Console */
135 { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */
136 { USB_DEVICE(0x10C4, 0x84B6) }, /* Starizona Hyperion */
137 { USB_DEVICE(0x10C4, 0x851E) }, /* CESINEL MEDCAL PT Network Analyzer */
138 { USB_DEVICE(0x10C4, 0x85A7) }, /* LifeScan OneTouch Verio IQ */
139 { USB_DEVICE(0x10C4, 0x85B8) }, /* CESINEL ReCon T Energy Logger */
140 { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */
141 { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */
142 { USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */
143 { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */
144 { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */
145 { USB_DEVICE(0x10C4, 0x8856) }, /* CEL EM357 ZigBee USB Stick - LR */
146 { USB_DEVICE(0x10C4, 0x8857) }, /* CEL EM357 ZigBee USB Stick */
147 { USB_DEVICE(0x10C4, 0x88A4) }, /* MMB Networks ZigBee USB Device */
148 { USB_DEVICE(0x10C4, 0x88A5) }, /* Planet Innovation Ingeni ZigBee USB Device */
149 { USB_DEVICE(0x10C4, 0x88D8) }, /* Acuity Brands nLight Air Adapter */
150 { USB_DEVICE(0x10C4, 0x88FB) }, /* CESINEL MEDCAL STII Network Analyzer */
151 { USB_DEVICE(0x10C4, 0x8938) }, /* CESINEL MEDCAL S II Network Analyzer */
152 { USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */
153 { USB_DEVICE(0x10C4, 0x8962) }, /* Brim Brothers charging dock */
154 { USB_DEVICE(0x10C4, 0x8977) }, /* CEL MeshWorks DevKit Device */
155 { USB_DEVICE(0x10C4, 0x8998) }, /* KCF Technologies PRN */
156 { USB_DEVICE(0x10C4, 0x89A4) }, /* CESINEL FTBC Flexible Thyristor Bridge Controller */
157 { USB_DEVICE(0x10C4, 0x89FB) }, /* Qivicon ZigBee USB Radio Stick */
158 { USB_DEVICE(0x10C4, 0x8A2A) }, /* HubZ dual ZigBee and Z-Wave dongle */
159 { USB_DEVICE(0x10C4, 0x8A5B) }, /* CEL EM3588 ZigBee USB Stick */
160 { USB_DEVICE(0x10C4, 0x8A5E) }, /* CEL EM3588 ZigBee USB Stick Long Range */
161 { USB_DEVICE(0x10C4, 0x8B34) }, /* Qivicon ZigBee USB Radio Stick */
162 { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
163 { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
164 { USB_DEVICE(0x10C4, 0xEA63) }, /* Silicon Labs Windows Update (CP2101-4/CP2102N) */
165 { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */
166 { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */
167 { USB_DEVICE(0x10C4, 0xEA7A) }, /* Silicon Labs Windows Update (CP2105) */
168 { USB_DEVICE(0x10C4, 0xEA7B) }, /* Silicon Labs Windows Update (CP2108) */
169 { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
170 { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
171 { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
172 { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
173 { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
174 { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */
175 { USB_DEVICE(0x12B8, 0xEC60) }, /* Link G4 ECU */
176 { USB_DEVICE(0x12B8, 0xEC62) }, /* Link G4+ ECU */
177 { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
178 { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */
179 { USB_DEVICE(0x155A, 0x1006) }, /* ELDAT Easywave RX09 */
180 { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */
181 { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */
182 { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
183 { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */
184 { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */
185 { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */
186 { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */
187 { USB_DEVICE(0x16C0, 0x09B0) }, /* Lunatico Seletek */
188 { USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */
189 { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
190 { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */
191 { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */
192 { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */
193 { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */
194 { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */
195 { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */
196 { USB_DEVICE(0x17A8, 0x0101) }, /* Kamstrup 868 MHz wM-Bus C-Mode Meter Reader (Int Ant) */
197 { USB_DEVICE(0x17A8, 0x0102) }, /* Kamstrup 868 MHz wM-Bus C-Mode Meter Reader (Ext Ant) */
198 { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */
199 { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */
200 { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
201 { USB_DEVICE(0x18EF, 0xE025) }, /* ELV Marble Sound Board 1 */
202 { USB_DEVICE(0x18EF, 0xE030) }, /* ELV ALC 8xxx Battery Charger */
203 { USB_DEVICE(0x18EF, 0xE032) }, /* ELV TFD500 Data Logger */
204 { USB_DEVICE(0x1901, 0x0190) }, /* GE B850 CP2105 Recorder interface */
205 { USB_DEVICE(0x1901, 0x0193) }, /* GE B650 CP2104 PMC interface */
206 { USB_DEVICE(0x1901, 0x0194) }, /* GE Healthcare Remote Alarm Box */
207 { USB_DEVICE(0x1901, 0x0195) }, /* GE B850/B650/B450 CP2104 DP UART interface */
208 { USB_DEVICE(0x1901, 0x0196) }, /* GE B850 CP2105 DP UART interface */
209 { USB_DEVICE(0x1901, 0x0197) }, /* GE CS1000 M.2 Key E serial interface */
210 { USB_DEVICE(0x1901, 0x0198) }, /* GE CS1000 Display serial interface */
211 { USB_DEVICE(0x199B, 0xBA30) }, /* LORD WSDA-200-USB */
212 { USB_DEVICE(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */
213 { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */
214 { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */
215 { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */
216 { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */
217 { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */
218 { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */
219 { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */
220 { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */
221 { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */
222 { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */
223 { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */
224 { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */
225 { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */
226 { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */
227 { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */
228 { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */
229 { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */
230 { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */
231 { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */
232 { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */
233 { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */
234 { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */
235 { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */
236 { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */
237 { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */
238 { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */
239 { USB_DEVICE(0x2184, 0x0030) }, /* GW Instek GDM-834x Digital Multimeter */
240 { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */
241 { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */
242 { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */
243 { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */
244 { USB_DEVICE(0x3923, 0x7A0B) }, /* National Instruments USB Serial Console */
245 { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */
246 { } /* Terminating Entry */
249 MODULE_DEVICE_TABLE(usb, id_table);
251 struct cp210x_port_private {
252 __u8 bInterfaceNumber;
253 bool has_swapped_line_ctl;
256 static struct usb_serial_driver cp210x_device = {
258 .owner = THIS_MODULE,
261 .id_table = id_table,
264 .bulk_out_size = 256,
266 .close = cp210x_close,
267 .break_ctl = cp210x_break_ctl,
268 .set_termios = cp210x_set_termios,
269 .tx_empty = cp210x_tx_empty,
270 .throttle = usb_serial_generic_throttle,
271 .unthrottle = usb_serial_generic_unthrottle,
272 .tiocmget = cp210x_tiocmget,
273 .tiocmset = cp210x_tiocmset,
274 .port_probe = cp210x_port_probe,
275 .port_remove = cp210x_port_remove,
276 .dtr_rts = cp210x_dtr_rts
279 static struct usb_serial_driver * const serial_drivers[] = {
283 /* Config request types */
284 #define REQTYPE_HOST_TO_INTERFACE 0x41
285 #define REQTYPE_INTERFACE_TO_HOST 0xc1
286 #define REQTYPE_HOST_TO_DEVICE 0x40
287 #define REQTYPE_DEVICE_TO_HOST 0xc0
289 /* Config request codes */
290 #define CP210X_IFC_ENABLE 0x00
291 #define CP210X_SET_BAUDDIV 0x01
292 #define CP210X_GET_BAUDDIV 0x02
293 #define CP210X_SET_LINE_CTL 0x03
294 #define CP210X_GET_LINE_CTL 0x04
295 #define CP210X_SET_BREAK 0x05
296 #define CP210X_IMM_CHAR 0x06
297 #define CP210X_SET_MHS 0x07
298 #define CP210X_GET_MDMSTS 0x08
299 #define CP210X_SET_XON 0x09
300 #define CP210X_SET_XOFF 0x0A
301 #define CP210X_SET_EVENTMASK 0x0B
302 #define CP210X_GET_EVENTMASK 0x0C
303 #define CP210X_SET_CHAR 0x0D
304 #define CP210X_GET_CHARS 0x0E
305 #define CP210X_GET_PROPS 0x0F
306 #define CP210X_GET_COMM_STATUS 0x10
307 #define CP210X_RESET 0x11
308 #define CP210X_PURGE 0x12
309 #define CP210X_SET_FLOW 0x13
310 #define CP210X_GET_FLOW 0x14
311 #define CP210X_EMBED_EVENTS 0x15
312 #define CP210X_GET_EVENTSTATE 0x16
313 #define CP210X_SET_CHARS 0x19
314 #define CP210X_GET_BAUDRATE 0x1D
315 #define CP210X_SET_BAUDRATE 0x1E
317 /* CP210X_IFC_ENABLE */
318 #define UART_ENABLE 0x0001
319 #define UART_DISABLE 0x0000
321 /* CP210X_(SET|GET)_BAUDDIV */
322 #define BAUD_RATE_GEN_FREQ 0x384000
324 /* CP210X_(SET|GET)_LINE_CTL */
325 #define BITS_DATA_MASK 0X0f00
326 #define BITS_DATA_5 0X0500
327 #define BITS_DATA_6 0X0600
328 #define BITS_DATA_7 0X0700
329 #define BITS_DATA_8 0X0800
330 #define BITS_DATA_9 0X0900
332 #define BITS_PARITY_MASK 0x00f0
333 #define BITS_PARITY_NONE 0x0000
334 #define BITS_PARITY_ODD 0x0010
335 #define BITS_PARITY_EVEN 0x0020
336 #define BITS_PARITY_MARK 0x0030
337 #define BITS_PARITY_SPACE 0x0040
339 #define BITS_STOP_MASK 0x000f
340 #define BITS_STOP_1 0x0000
341 #define BITS_STOP_1_5 0x0001
342 #define BITS_STOP_2 0x0002
344 /* CP210X_SET_BREAK */
345 #define BREAK_ON 0x0001
346 #define BREAK_OFF 0x0000
348 /* CP210X_(SET_MHS|GET_MDMSTS) */
349 #define CONTROL_DTR 0x0001
350 #define CONTROL_RTS 0x0002
351 #define CONTROL_CTS 0x0010
352 #define CONTROL_DSR 0x0020
353 #define CONTROL_RING 0x0040
354 #define CONTROL_DCD 0x0080
355 #define CONTROL_WRITE_DTR 0x0100
356 #define CONTROL_WRITE_RTS 0x0200
358 /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */
359 struct cp210x_comm_status {
361 __le32 ulHoldReasons;
362 __le32 ulAmountInInQueue;
363 __le32 ulAmountInOutQueue;
365 u8 bWaitForImmediate;
370 * CP210X_PURGE - 16 bits passed in wValue of USB request.
371 * SiLabs app note AN571 gives a strange description of the 4 bits:
372 * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive.
373 * writing 1 to all, however, purges cp2108 well enough to avoid the hang.
375 #define PURGE_ALL 0x000f
377 /* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */
378 struct cp210x_flow_ctl {
379 __le32 ulControlHandshake;
380 __le32 ulFlowReplace;
385 /* cp210x_flow_ctl::ulControlHandshake */
386 #define CP210X_SERIAL_DTR_MASK GENMASK(1, 0)
387 #define CP210X_SERIAL_DTR_SHIFT(_mode) (_mode)
388 #define CP210X_SERIAL_CTS_HANDSHAKE BIT(3)
389 #define CP210X_SERIAL_DSR_HANDSHAKE BIT(4)
390 #define CP210X_SERIAL_DCD_HANDSHAKE BIT(5)
391 #define CP210X_SERIAL_DSR_SENSITIVITY BIT(6)
393 /* values for cp210x_flow_ctl::ulControlHandshake::CP210X_SERIAL_DTR_MASK */
394 #define CP210X_SERIAL_DTR_INACTIVE 0
395 #define CP210X_SERIAL_DTR_ACTIVE 1
396 #define CP210X_SERIAL_DTR_FLOW_CTL 2
398 /* cp210x_flow_ctl::ulFlowReplace */
399 #define CP210X_SERIAL_AUTO_TRANSMIT BIT(0)
400 #define CP210X_SERIAL_AUTO_RECEIVE BIT(1)
401 #define CP210X_SERIAL_ERROR_CHAR BIT(2)
402 #define CP210X_SERIAL_NULL_STRIPPING BIT(3)
403 #define CP210X_SERIAL_BREAK_CHAR BIT(4)
404 #define CP210X_SERIAL_RTS_MASK GENMASK(7, 6)
405 #define CP210X_SERIAL_RTS_SHIFT(_mode) (_mode << 6)
406 #define CP210X_SERIAL_XOFF_CONTINUE BIT(31)
408 /* values for cp210x_flow_ctl::ulFlowReplace::CP210X_SERIAL_RTS_MASK */
409 #define CP210X_SERIAL_RTS_INACTIVE 0
410 #define CP210X_SERIAL_RTS_ACTIVE 1
411 #define CP210X_SERIAL_RTS_FLOW_CTL 2
414 * Reads a variable-sized block of CP210X_ registers, identified by req.
415 * Returns data into buf in native USB byte order.
417 static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req,
418 void *buf, int bufsize)
420 struct usb_serial *serial = port->serial;
421 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
425 dmabuf = kmalloc(bufsize, GFP_KERNEL);
428 * FIXME Some callers don't bother to check for error,
429 * at least give them consistent junk until they are fixed
431 memset(buf, 0, bufsize);
435 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
436 req, REQTYPE_INTERFACE_TO_HOST, 0,
437 port_priv->bInterfaceNumber, dmabuf, bufsize,
438 USB_CTRL_SET_TIMEOUT);
439 if (result == bufsize) {
440 memcpy(buf, dmabuf, bufsize);
443 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n",
444 req, bufsize, result);
449 * FIXME Some callers don't bother to check for error,
450 * at least give them consistent junk until they are fixed
452 memset(buf, 0, bufsize);
461 * Reads any 32-bit CP210X_ register identified by req.
463 static int cp210x_read_u32_reg(struct usb_serial_port *port, u8 req, u32 *val)
468 err = cp210x_read_reg_block(port, req, &le32_val, sizeof(le32_val));
471 * FIXME Some callers don't bother to check for error,
472 * at least give them consistent junk until they are fixed
478 *val = le32_to_cpu(le32_val);
484 * Reads any 16-bit CP210X_ register identified by req.
486 static int cp210x_read_u16_reg(struct usb_serial_port *port, u8 req, u16 *val)
491 err = cp210x_read_reg_block(port, req, &le16_val, sizeof(le16_val));
495 *val = le16_to_cpu(le16_val);
501 * Reads any 8-bit CP210X_ register identified by req.
503 static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val)
505 return cp210x_read_reg_block(port, req, val, sizeof(*val));
509 * Writes any 16-bit CP210X_ register (req) whose value is passed
510 * entirely in the wValue field of the USB request.
512 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val)
514 struct usb_serial *serial = port->serial;
515 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
518 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
519 req, REQTYPE_HOST_TO_INTERFACE, val,
520 port_priv->bInterfaceNumber, NULL, 0,
521 USB_CTRL_SET_TIMEOUT);
523 dev_err(&port->dev, "failed set request 0x%x status: %d\n",
531 * Writes a variable-sized block of CP210X_ registers, identified by req.
532 * Data in buf must be in native USB byte order.
534 static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req,
535 void *buf, int bufsize)
537 struct usb_serial *serial = port->serial;
538 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
542 dmabuf = kmemdup(buf, bufsize, GFP_KERNEL);
546 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
547 req, REQTYPE_HOST_TO_INTERFACE, 0,
548 port_priv->bInterfaceNumber, dmabuf, bufsize,
549 USB_CTRL_SET_TIMEOUT);
553 if (result == bufsize) {
556 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n",
557 req, bufsize, result);
566 * Writes any 32-bit CP210X_ register identified by req.
568 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val)
572 le32_val = cpu_to_le32(val);
574 return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val));
578 * Detect CP2108 GET_LINE_CTL bug and activate workaround.
579 * Write a known good value 0x800, read it back.
580 * If it comes back swapped the bug is detected.
581 * Preserve the original register value.
583 static int cp210x_detect_swapped_line_ctl(struct usb_serial_port *port)
585 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
590 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_save);
594 err = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, 0x800);
598 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_test);
602 if (line_ctl_test == 8) {
603 port_priv->has_swapped_line_ctl = true;
604 line_ctl_save = swab16(line_ctl_save);
607 return cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, line_ctl_save);
611 * Must always be called instead of cp210x_read_u16_reg(CP210X_GET_LINE_CTL)
612 * to workaround cp2108 bug and get correct value.
614 static int cp210x_get_line_ctl(struct usb_serial_port *port, u16 *ctl)
616 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
619 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, ctl);
623 /* Workaround swapped bytes in 16-bit value from CP210X_GET_LINE_CTL */
624 if (port_priv->has_swapped_line_ctl)
631 * cp210x_quantise_baudrate
632 * Quantises the baud rate as per AN205 Table 1
634 static unsigned int cp210x_quantise_baudrate(unsigned int baud)
638 else if (baud <= 600) baud = 600;
639 else if (baud <= 1200) baud = 1200;
640 else if (baud <= 1800) baud = 1800;
641 else if (baud <= 2400) baud = 2400;
642 else if (baud <= 4000) baud = 4000;
643 else if (baud <= 4803) baud = 4800;
644 else if (baud <= 7207) baud = 7200;
645 else if (baud <= 9612) baud = 9600;
646 else if (baud <= 14428) baud = 14400;
647 else if (baud <= 16062) baud = 16000;
648 else if (baud <= 19250) baud = 19200;
649 else if (baud <= 28912) baud = 28800;
650 else if (baud <= 38601) baud = 38400;
651 else if (baud <= 51558) baud = 51200;
652 else if (baud <= 56280) baud = 56000;
653 else if (baud <= 58053) baud = 57600;
654 else if (baud <= 64111) baud = 64000;
655 else if (baud <= 77608) baud = 76800;
656 else if (baud <= 117028) baud = 115200;
657 else if (baud <= 129347) baud = 128000;
658 else if (baud <= 156868) baud = 153600;
659 else if (baud <= 237832) baud = 230400;
660 else if (baud <= 254234) baud = 250000;
661 else if (baud <= 273066) baud = 256000;
662 else if (baud <= 491520) baud = 460800;
663 else if (baud <= 567138) baud = 500000;
664 else if (baud <= 670254) baud = 576000;
665 else if (baud < 1000000)
667 else if (baud > 2000000)
672 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
676 result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE);
678 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__);
682 /* Configure the termios structure */
683 cp210x_get_termios(tty, port);
685 /* The baud rate must be initialised on cp2104 */
687 cp210x_change_speed(tty, port, NULL);
689 return usb_serial_generic_open(tty, port);
692 static void cp210x_close(struct usb_serial_port *port)
694 usb_serial_generic_close(port);
696 /* Clear both queues; cp2108 needs this to avoid an occasional hang */
697 cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL);
699 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
703 * Read how many bytes are waiting in the TX queue.
705 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port,
708 struct usb_serial *serial = port->serial;
709 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
710 struct cp210x_comm_status *sts;
713 sts = kmalloc(sizeof(*sts), GFP_KERNEL);
717 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
718 CP210X_GET_COMM_STATUS, REQTYPE_INTERFACE_TO_HOST,
719 0, port_priv->bInterfaceNumber, sts, sizeof(*sts),
720 USB_CTRL_GET_TIMEOUT);
721 if (result == sizeof(*sts)) {
722 *count = le32_to_cpu(sts->ulAmountInOutQueue);
725 dev_err(&port->dev, "failed to get comm status: %d\n", result);
735 static bool cp210x_tx_empty(struct usb_serial_port *port)
740 err = cp210x_get_tx_queue_byte_count(port, &count);
749 * Reads the baud rate, data bits, parity, stop bits and flow control mode
750 * from the device, corrects any unsupported values, and configures the
751 * termios structure to reflect the state of the device
753 static void cp210x_get_termios(struct tty_struct *tty,
754 struct usb_serial_port *port)
759 cp210x_get_termios_port(tty->driver_data,
760 &tty->termios.c_cflag, &baud);
761 tty_encode_baud_rate(tty, baud, baud);
765 cp210x_get_termios_port(port, &cflag, &baud);
770 * cp210x_get_termios_port
771 * This is the heart of cp210x_get_termios which always uses a &usb_serial_port.
773 static void cp210x_get_termios_port(struct usb_serial_port *port,
774 tcflag_t *cflagp, unsigned int *baudp)
776 struct device *dev = &port->dev;
778 struct cp210x_flow_ctl flow_ctl;
784 cp210x_read_u32_reg(port, CP210X_GET_BAUDRATE, &baud);
786 dev_dbg(dev, "%s - baud rate = %d\n", __func__, baud);
791 cp210x_get_line_ctl(port, &bits);
793 switch (bits & BITS_DATA_MASK) {
795 dev_dbg(dev, "%s - data bits = 5\n", __func__);
799 dev_dbg(dev, "%s - data bits = 6\n", __func__);
803 dev_dbg(dev, "%s - data bits = 7\n", __func__);
807 dev_dbg(dev, "%s - data bits = 8\n", __func__);
811 dev_dbg(dev, "%s - data bits = 9 (not supported, using 8 data bits)\n", __func__);
813 bits &= ~BITS_DATA_MASK;
815 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
818 dev_dbg(dev, "%s - Unknown number of data bits, using 8\n", __func__);
820 bits &= ~BITS_DATA_MASK;
822 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
826 switch (bits & BITS_PARITY_MASK) {
827 case BITS_PARITY_NONE:
828 dev_dbg(dev, "%s - parity = NONE\n", __func__);
831 case BITS_PARITY_ODD:
832 dev_dbg(dev, "%s - parity = ODD\n", __func__);
833 cflag |= (PARENB|PARODD);
835 case BITS_PARITY_EVEN:
836 dev_dbg(dev, "%s - parity = EVEN\n", __func__);
840 case BITS_PARITY_MARK:
841 dev_dbg(dev, "%s - parity = MARK\n", __func__);
842 cflag |= (PARENB|PARODD|CMSPAR);
844 case BITS_PARITY_SPACE:
845 dev_dbg(dev, "%s - parity = SPACE\n", __func__);
847 cflag |= (PARENB|CMSPAR);
850 dev_dbg(dev, "%s - Unknown parity mode, disabling parity\n", __func__);
852 bits &= ~BITS_PARITY_MASK;
853 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
858 switch (bits & BITS_STOP_MASK) {
860 dev_dbg(dev, "%s - stop bits = 1\n", __func__);
863 dev_dbg(dev, "%s - stop bits = 1.5 (not supported, using 1 stop bit)\n", __func__);
864 bits &= ~BITS_STOP_MASK;
865 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
868 dev_dbg(dev, "%s - stop bits = 2\n", __func__);
872 dev_dbg(dev, "%s - Unknown number of stop bits, using 1 stop bit\n", __func__);
873 bits &= ~BITS_STOP_MASK;
874 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
878 cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
880 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
881 if (ctl_hs & CP210X_SERIAL_CTS_HANDSHAKE) {
882 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
884 * When the port is closed, the CP210x hardware disables
885 * auto-RTS and RTS is deasserted but it leaves auto-CTS when
886 * in hardware flow control mode. When re-opening the port, if
887 * auto-CTS is enabled on the cp210x, then auto-RTS must be
888 * re-enabled in the driver.
890 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
891 flow_repl &= ~CP210X_SERIAL_RTS_MASK;
892 flow_repl |= CP210X_SERIAL_RTS_SHIFT(CP210X_SERIAL_RTS_FLOW_CTL);
893 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
894 cp210x_write_reg_block(port,
901 dev_dbg(dev, "%s - flow control = NONE\n", __func__);
909 * CP2101 supports the following baud rates:
911 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800,
912 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600
914 * CP2102 and CP2103 support the following additional rates:
916 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000,
919 * The device will map a requested rate to a supported one, but the result
920 * of requests for rates greater than 1053257 is undefined (see AN205).
922 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud,
923 * respectively, with an error less than 1%. The actual rates are determined
926 * div = round(freq / (2 x prescale x request))
927 * actual = freq / (2 x prescale x div)
929 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps
931 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1
934 static void cp210x_change_speed(struct tty_struct *tty,
935 struct usb_serial_port *port, struct ktermios *old_termios)
939 baud = tty->termios.c_ospeed;
941 /* This maps the requested rate to a rate valid on cp2102 or cp2103,
942 * or to an arbitrary rate in [1M,2M].
944 * NOTE: B0 is not implemented.
946 baud = cp210x_quantise_baudrate(baud);
948 dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud);
949 if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) {
950 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud);
952 baud = old_termios->c_ospeed;
957 tty_encode_baud_rate(tty, baud, baud);
960 static void cp210x_set_termios(struct tty_struct *tty,
961 struct usb_serial_port *port, struct ktermios *old_termios)
963 struct device *dev = &port->dev;
964 unsigned int cflag, old_cflag;
967 cflag = tty->termios.c_cflag;
968 old_cflag = old_termios->c_cflag;
970 if (tty->termios.c_ospeed != old_termios->c_ospeed)
971 cp210x_change_speed(tty, port, old_termios);
973 /* If the number of data bits is to be updated */
974 if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
975 cp210x_get_line_ctl(port, &bits);
976 bits &= ~BITS_DATA_MASK;
977 switch (cflag & CSIZE) {
980 dev_dbg(dev, "%s - data bits = 5\n", __func__);
984 dev_dbg(dev, "%s - data bits = 6\n", __func__);
988 dev_dbg(dev, "%s - data bits = 7\n", __func__);
992 dev_dbg(dev, "%s - data bits = 8\n", __func__);
996 dev_dbg(dev, "%s - data bits = 9\n", __func__);
999 dev_dbg(dev, "cp210x driver does not support the number of bits requested, using 8 bit mode\n");
1000 bits |= BITS_DATA_8;
1003 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1004 dev_dbg(dev, "Number of data bits requested not supported by device\n");
1007 if ((cflag & (PARENB|PARODD|CMSPAR)) !=
1008 (old_cflag & (PARENB|PARODD|CMSPAR))) {
1009 cp210x_get_line_ctl(port, &bits);
1010 bits &= ~BITS_PARITY_MASK;
1011 if (cflag & PARENB) {
1012 if (cflag & CMSPAR) {
1013 if (cflag & PARODD) {
1014 bits |= BITS_PARITY_MARK;
1015 dev_dbg(dev, "%s - parity = MARK\n", __func__);
1017 bits |= BITS_PARITY_SPACE;
1018 dev_dbg(dev, "%s - parity = SPACE\n", __func__);
1021 if (cflag & PARODD) {
1022 bits |= BITS_PARITY_ODD;
1023 dev_dbg(dev, "%s - parity = ODD\n", __func__);
1025 bits |= BITS_PARITY_EVEN;
1026 dev_dbg(dev, "%s - parity = EVEN\n", __func__);
1030 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1031 dev_dbg(dev, "Parity mode not supported by device\n");
1034 if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
1035 cp210x_get_line_ctl(port, &bits);
1036 bits &= ~BITS_STOP_MASK;
1037 if (cflag & CSTOPB) {
1038 bits |= BITS_STOP_2;
1039 dev_dbg(dev, "%s - stop bits = 2\n", __func__);
1041 bits |= BITS_STOP_1;
1042 dev_dbg(dev, "%s - stop bits = 1\n", __func__);
1044 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1045 dev_dbg(dev, "Number of stop bits requested not supported by device\n");
1048 if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
1049 struct cp210x_flow_ctl flow_ctl;
1053 cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
1055 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1056 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
1057 dev_dbg(dev, "%s - read ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n",
1058 __func__, ctl_hs, flow_repl);
1060 ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE;
1061 ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE;
1062 ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY;
1063 ctl_hs &= ~CP210X_SERIAL_DTR_MASK;
1064 ctl_hs |= CP210X_SERIAL_DTR_SHIFT(CP210X_SERIAL_DTR_ACTIVE);
1065 if (cflag & CRTSCTS) {
1066 ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE;
1068 flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1069 flow_repl |= CP210X_SERIAL_RTS_SHIFT(
1070 CP210X_SERIAL_RTS_FLOW_CTL);
1071 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
1073 ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE;
1075 flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1076 flow_repl |= CP210X_SERIAL_RTS_SHIFT(
1077 CP210X_SERIAL_RTS_ACTIVE);
1078 dev_dbg(dev, "%s - flow control = NONE\n", __func__);
1081 dev_dbg(dev, "%s - write ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n",
1082 __func__, ctl_hs, flow_repl);
1083 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs);
1084 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1085 cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl,
1091 static int cp210x_tiocmset(struct tty_struct *tty,
1092 unsigned int set, unsigned int clear)
1094 struct usb_serial_port *port = tty->driver_data;
1095 return cp210x_tiocmset_port(port, set, clear);
1098 static int cp210x_tiocmset_port(struct usb_serial_port *port,
1099 unsigned int set, unsigned int clear)
1103 if (set & TIOCM_RTS) {
1104 control |= CONTROL_RTS;
1105 control |= CONTROL_WRITE_RTS;
1107 if (set & TIOCM_DTR) {
1108 control |= CONTROL_DTR;
1109 control |= CONTROL_WRITE_DTR;
1111 if (clear & TIOCM_RTS) {
1112 control &= ~CONTROL_RTS;
1113 control |= CONTROL_WRITE_RTS;
1115 if (clear & TIOCM_DTR) {
1116 control &= ~CONTROL_DTR;
1117 control |= CONTROL_WRITE_DTR;
1120 dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control);
1122 return cp210x_write_u16_reg(port, CP210X_SET_MHS, control);
1125 static void cp210x_dtr_rts(struct usb_serial_port *p, int on)
1128 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0);
1130 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS);
1133 static int cp210x_tiocmget(struct tty_struct *tty)
1135 struct usb_serial_port *port = tty->driver_data;
1139 result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control);
1143 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
1144 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
1145 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
1146 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
1147 |((control & CONTROL_RING)? TIOCM_RI : 0)
1148 |((control & CONTROL_DCD) ? TIOCM_CD : 0);
1150 dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control);
1155 static void cp210x_break_ctl(struct tty_struct *tty, int break_state)
1157 struct usb_serial_port *port = tty->driver_data;
1160 if (break_state == 0)
1164 dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
1165 state == BREAK_OFF ? "off" : "on");
1166 cp210x_write_u16_reg(port, CP210X_SET_BREAK, state);
1169 static int cp210x_port_probe(struct usb_serial_port *port)
1171 struct usb_serial *serial = port->serial;
1172 struct usb_host_interface *cur_altsetting;
1173 struct cp210x_port_private *port_priv;
1176 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
1180 cur_altsetting = serial->interface->cur_altsetting;
1181 port_priv->bInterfaceNumber = cur_altsetting->desc.bInterfaceNumber;
1183 usb_set_serial_port_data(port, port_priv);
1185 ret = cp210x_detect_swapped_line_ctl(port);
1194 static int cp210x_port_remove(struct usb_serial_port *port)
1196 struct cp210x_port_private *port_priv;
1198 port_priv = usb_get_serial_port_data(port);
1204 module_usb_serial_driver(serial_drivers, id_table);
1206 MODULE_DESCRIPTION(DRIVER_DESC);
1207 MODULE_LICENSE("GPL");