cp210x.c (6f7ec77cc8b64ff5037c1945e4650c65c458037d) cp210x.c (63a8eef70ccb5199534dec56fed9759d214bfe55)
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Silicon Laboratories CP210x USB to RS232 serial adaptor driver
4 *
5 * Copyright (C) 2005 Craig Shelley (craig@microtron.org.uk)
6 * Copyright (C) 2010-2021 Johan Hovold (johan@kernel.org)
7 *
8 * Support to set flow control line levels using TIOCMGET and TIOCMSET

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247#ifdef CONFIG_GPIOLIB
248 struct gpio_chip gc;
249 bool gpio_registered;
250 u8 gpio_pushpull;
251 u8 gpio_altfunc;
252 u8 gpio_input;
253#endif
254 u8 partnum;
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Silicon Laboratories CP210x USB to RS232 serial adaptor driver
4 *
5 * Copyright (C) 2005 Craig Shelley (craig@microtron.org.uk)
6 * Copyright (C) 2010-2021 Johan Hovold (johan@kernel.org)
7 *
8 * Support to set flow control line levels using TIOCMGET and TIOCMSET

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247#ifdef CONFIG_GPIOLIB
248 struct gpio_chip gc;
249 bool gpio_registered;
250 u8 gpio_pushpull;
251 u8 gpio_altfunc;
252 u8 gpio_input;
253#endif
254 u8 partnum;
255 u32 fw_version;
255 speed_t min_speed;
256 speed_t max_speed;
257 bool use_actual_rate;
256 speed_t min_speed;
257 speed_t max_speed;
258 bool use_actual_rate;
259 bool no_flow_control;
258};
259
260enum cp210x_event_state {
261 ES_DATA,
262 ES_ESCAPE,
263 ES_LSR,
264 ES_LSR_DATA_0,
265 ES_LSR_DATA_1,

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393 u8 bBreakChar;
394 u8 bEventChar;
395 u8 bXonChar;
396 u8 bXoffChar;
397};
398
399/* CP210X_VENDOR_SPECIFIC values */
400#define CP210X_READ_2NCONFIG 0x000E
260};
261
262enum cp210x_event_state {
263 ES_DATA,
264 ES_ESCAPE,
265 ES_LSR,
266 ES_LSR_DATA_0,
267 ES_LSR_DATA_1,

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395 u8 bBreakChar;
396 u8 bEventChar;
397 u8 bXonChar;
398 u8 bXoffChar;
399};
400
401/* CP210X_VENDOR_SPECIFIC values */
402#define CP210X_READ_2NCONFIG 0x000E
403#define CP210X_GET_FW_VER_2N 0x0010
401#define CP210X_READ_LATCH 0x00C2
402#define CP210X_GET_PARTNUM 0x370B
403#define CP210X_GET_PORTCONFIG 0x370C
404#define CP210X_GET_DEVICEMODE 0x3711
405#define CP210X_WRITE_LATCH 0x37E1
406
407/* Part number definitions */
408#define CP210X_PARTNUM_CP2101 0x01

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1123 a->c_cc[VSTOP] != b->c_cc[VSTOP];
1124
1125 return tty_termios_hw_change(a, b) || iflag_change || cc_change;
1126}
1127
1128static void cp210x_set_flow_control(struct tty_struct *tty,
1129 struct usb_serial_port *port, struct ktermios *old_termios)
1130{
404#define CP210X_READ_LATCH 0x00C2
405#define CP210X_GET_PARTNUM 0x370B
406#define CP210X_GET_PORTCONFIG 0x370C
407#define CP210X_GET_DEVICEMODE 0x3711
408#define CP210X_WRITE_LATCH 0x37E1
409
410/* Part number definitions */
411#define CP210X_PARTNUM_CP2101 0x01

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1126 a->c_cc[VSTOP] != b->c_cc[VSTOP];
1127
1128 return tty_termios_hw_change(a, b) || iflag_change || cc_change;
1129}
1130
1131static void cp210x_set_flow_control(struct tty_struct *tty,
1132 struct usb_serial_port *port, struct ktermios *old_termios)
1133{
1134 struct cp210x_serial_private *priv = usb_get_serial_data(port->serial);
1131 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1132 struct cp210x_special_chars chars;
1133 struct cp210x_flow_ctl flow_ctl;
1134 u32 flow_repl;
1135 u32 ctl_hs;
1136 int ret;
1137
1135 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1136 struct cp210x_special_chars chars;
1137 struct cp210x_flow_ctl flow_ctl;
1138 u32 flow_repl;
1139 u32 ctl_hs;
1140 int ret;
1141
1142 /*
1143 * Some CP2102N interpret ulXonLimit as ulFlowReplace (erratum
1144 * CP2102N_E104). Report back that flow control is not supported.
1145 */
1146 if (priv->no_flow_control) {
1147 tty->termios.c_cflag &= ~CRTSCTS;
1148 tty->termios.c_iflag &= ~(IXON | IXOFF);
1149 }
1150
1138 if (old_termios &&
1139 C_CRTSCTS(tty) == (old_termios->c_cflag & CRTSCTS) &&
1140 I_IXON(tty) == (old_termios->c_iflag & IXON) &&
1141 I_IXOFF(tty) == (old_termios->c_iflag & IXOFF) &&
1142 START_CHAR(tty) == old_termios->c_cc[VSTART] &&
1143 STOP_CHAR(tty) == old_termios->c_cc[VSTOP]) {
1144 return;
1145 }

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1186 ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE;
1187 if (port_priv->rts)
1188 flow_repl |= CP210X_SERIAL_RTS_ACTIVE;
1189 else
1190 flow_repl |= CP210X_SERIAL_RTS_INACTIVE;
1191 port_priv->crtscts = false;
1192 }
1193
1151 if (old_termios &&
1152 C_CRTSCTS(tty) == (old_termios->c_cflag & CRTSCTS) &&
1153 I_IXON(tty) == (old_termios->c_iflag & IXON) &&
1154 I_IXOFF(tty) == (old_termios->c_iflag & IXOFF) &&
1155 START_CHAR(tty) == old_termios->c_cc[VSTART] &&
1156 STOP_CHAR(tty) == old_termios->c_cc[VSTOP]) {
1157 return;
1158 }

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1199 ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE;
1200 if (port_priv->rts)
1201 flow_repl |= CP210X_SERIAL_RTS_ACTIVE;
1202 else
1203 flow_repl |= CP210X_SERIAL_RTS_INACTIVE;
1204 port_priv->crtscts = false;
1205 }
1206
1194 if (I_IXOFF(tty))
1207 if (I_IXOFF(tty)) {
1195 flow_repl |= CP210X_SERIAL_AUTO_RECEIVE;
1208 flow_repl |= CP210X_SERIAL_AUTO_RECEIVE;
1196 else
1209
1210 flow_ctl.ulXonLimit = cpu_to_le32(128);
1211 flow_ctl.ulXoffLimit = cpu_to_le32(128);
1212 } else {
1197 flow_repl &= ~CP210X_SERIAL_AUTO_RECEIVE;
1213 flow_repl &= ~CP210X_SERIAL_AUTO_RECEIVE;
1214 }
1198
1199 if (I_IXON(tty))
1200 flow_repl |= CP210X_SERIAL_AUTO_TRANSMIT;
1201 else
1202 flow_repl &= ~CP210X_SERIAL_AUTO_TRANSMIT;
1203
1215
1216 if (I_IXON(tty))
1217 flow_repl |= CP210X_SERIAL_AUTO_TRANSMIT;
1218 else
1219 flow_repl &= ~CP210X_SERIAL_AUTO_TRANSMIT;
1220
1204 flow_ctl.ulXonLimit = cpu_to_le32(128);
1205 flow_ctl.ulXoffLimit = cpu_to_le32(128);
1206
1207 dev_dbg(&port->dev, "%s - ctrl = 0x%02x, flow = 0x%02x\n", __func__,
1208 ctl_hs, flow_repl);
1209
1210 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs);
1211 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1212
1213 cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl,
1214 sizeof(flow_ctl));

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1921 break;
1922 }
1923
1924 priv->min_speed = min;
1925 priv->max_speed = max;
1926 priv->use_actual_rate = use_actual_rate;
1927}
1928
1221 dev_dbg(&port->dev, "%s - ctrl = 0x%02x, flow = 0x%02x\n", __func__,
1222 ctl_hs, flow_repl);
1223
1224 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs);
1225 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1226
1227 cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl,
1228 sizeof(flow_ctl));

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1935 break;
1936 }
1937
1938 priv->min_speed = min;
1939 priv->max_speed = max;
1940 priv->use_actual_rate = use_actual_rate;
1941}
1942
1943static int cp210x_get_fw_version(struct usb_serial *serial, u16 value)
1944{
1945 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1946 u8 ver[3];
1947 int ret;
1948
1949 ret = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, value,
1950 ver, sizeof(ver));
1951 if (ret)
1952 return ret;
1953
1954 dev_dbg(&serial->interface->dev, "%s - %d.%d.%d\n", __func__,
1955 ver[0], ver[1], ver[2]);
1956
1957 priv->fw_version = ver[0] << 16 | ver[1] << 8 | ver[2];
1958
1959 return 0;
1960}
1961
1962static void cp210x_determine_quirks(struct usb_serial *serial)
1963{
1964 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1965 int ret;
1966
1967 switch (priv->partnum) {
1968 case CP210X_PARTNUM_CP2102N_QFN28:
1969 case CP210X_PARTNUM_CP2102N_QFN24:
1970 case CP210X_PARTNUM_CP2102N_QFN20:
1971 ret = cp210x_get_fw_version(serial, CP210X_GET_FW_VER_2N);
1972 if (ret)
1973 break;
1974 if (priv->fw_version <= 0x10004)
1975 priv->no_flow_control = true;
1976 break;
1977 default:
1978 break;
1979 }
1980}
1981
1929static int cp210x_attach(struct usb_serial *serial)
1930{
1931 int result;
1932 struct cp210x_serial_private *priv;
1933
1934 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1935 if (!priv)
1936 return -ENOMEM;

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1941 if (result < 0) {
1942 dev_warn(&serial->interface->dev,
1943 "querying part number failed\n");
1944 priv->partnum = CP210X_PARTNUM_UNKNOWN;
1945 }
1946
1947 usb_set_serial_data(serial, priv);
1948
1982static int cp210x_attach(struct usb_serial *serial)
1983{
1984 int result;
1985 struct cp210x_serial_private *priv;
1986
1987 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1988 if (!priv)
1989 return -ENOMEM;

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1994 if (result < 0) {
1995 dev_warn(&serial->interface->dev,
1996 "querying part number failed\n");
1997 priv->partnum = CP210X_PARTNUM_UNKNOWN;
1998 }
1999
2000 usb_set_serial_data(serial, priv);
2001
2002 cp210x_determine_quirks(serial);
1949 cp210x_init_max_speed(serial);
1950
1951 result = cp210x_gpio_init(serial);
1952 if (result < 0) {
1953 dev_err(&serial->interface->dev, "GPIO initialisation failed: %d\n",
1954 result);
1955 }
1956

--- 21 unchanged lines hidden --- 		2003 cp210x_init_max_speed(serial);
2004
2005 result = cp210x_gpio_init(serial);
2006 if (result < 0) {
2007 dev_err(&serial->interface->dev, "GPIO initialisation failed: %d\n",
2008 result);
2009 }
2010

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