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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 | // SPDX-License-Identifier: GPL-2.0+ /* * MaxLinear/Exar USB to Serial driver * * Copyright (c) 2020 Manivannan Sadhasivam <mani@kernel.org> * Copyright (c) 2021 Johan Hovold <johan@kernel.org> * * Based on the initial driver written by Patong Yang: * * https://lore.kernel.org/r/20180404070634.nhspvmxcjwfgjkcv@advantechmxl-desktop * * Copyright (c) 2018 Patong Yang <patong.mxl@gmail.com> */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/slab.h> #include <linux/tty.h> #include <linux/usb.h> #include <linux/usb/cdc.h> #include <linux/usb/serial.h> struct xr_txrx_clk_mask { u16 tx; u16 rx0; u16 rx1; }; #define XR_INT_OSC_HZ 48000000U #define XR21V141X_MIN_SPEED 46U #define XR21V141X_MAX_SPEED XR_INT_OSC_HZ /* XR21V141X register blocks */ #define XR21V141X_UART_REG_BLOCK 0 #define XR21V141X_UM_REG_BLOCK 4 #define XR21V141X_UART_CUSTOM_BLOCK 0x66 /* XR21V141X UART registers */ #define XR21V141X_CLOCK_DIVISOR_0 0x04 #define XR21V141X_CLOCK_DIVISOR_1 0x05 #define XR21V141X_CLOCK_DIVISOR_2 0x06 #define XR21V141X_TX_CLOCK_MASK_0 0x07 #define XR21V141X_TX_CLOCK_MASK_1 0x08 #define XR21V141X_RX_CLOCK_MASK_0 0x09 #define XR21V141X_RX_CLOCK_MASK_1 0x0a #define XR21V141X_REG_FORMAT 0x0b /* XR21V141X UART Manager registers */ #define XR21V141X_UM_FIFO_ENABLE_REG 0x10 #define XR21V141X_UM_ENABLE_TX_FIFO 0x01 #define XR21V141X_UM_ENABLE_RX_FIFO 0x02 #define XR21V141X_UM_RX_FIFO_RESET 0x18 #define XR21V141X_UM_TX_FIFO_RESET 0x1c #define XR_UART_ENABLE_TX 0x1 #define XR_UART_ENABLE_RX 0x2 #define XR_GPIO_RI BIT(0) #define XR_GPIO_CD BIT(1) #define XR_GPIO_DSR BIT(2) #define XR_GPIO_DTR BIT(3) #define XR_GPIO_CTS BIT(4) #define XR_GPIO_RTS BIT(5) #define XR_GPIO_CLK BIT(6) #define XR_GPIO_XEN BIT(7) #define XR_GPIO_TXT BIT(8) #define XR_GPIO_RXT BIT(9) #define XR_UART_DATA_MASK GENMASK(3, 0) #define XR_UART_DATA_7 0x7 #define XR_UART_DATA_8 0x8 #define XR_UART_PARITY_MASK GENMASK(6, 4) #define XR_UART_PARITY_SHIFT 4 #define XR_UART_PARITY_NONE (0x0 << XR_UART_PARITY_SHIFT) #define XR_UART_PARITY_ODD (0x1 << XR_UART_PARITY_SHIFT) #define XR_UART_PARITY_EVEN (0x2 << XR_UART_PARITY_SHIFT) #define XR_UART_PARITY_MARK (0x3 << XR_UART_PARITY_SHIFT) #define XR_UART_PARITY_SPACE (0x4 << XR_UART_PARITY_SHIFT) #define XR_UART_STOP_MASK BIT(7) #define XR_UART_STOP_SHIFT 7 #define XR_UART_STOP_1 (0x0 << XR_UART_STOP_SHIFT) #define XR_UART_STOP_2 (0x1 << XR_UART_STOP_SHIFT) #define XR_UART_FLOW_MODE_NONE 0x0 #define XR_UART_FLOW_MODE_HW 0x1 #define XR_UART_FLOW_MODE_SW 0x2 #define XR_GPIO_MODE_SEL_MASK GENMASK(2, 0) #define XR_GPIO_MODE_SEL_RTS_CTS 0x1 #define XR_GPIO_MODE_SEL_DTR_DSR 0x2 #define XR_GPIO_MODE_SEL_RS485 0x3 #define XR_GPIO_MODE_SEL_RS485_ADDR 0x4 #define XR_GPIO_MODE_TX_TOGGLE 0x100 #define XR_GPIO_MODE_RX_TOGGLE 0x200 #define XR_FIFO_RESET 0x1 #define XR_CUSTOM_DRIVER_ACTIVE 0x1 static int xr21v141x_uart_enable(struct usb_serial_port *port); static int xr21v141x_uart_disable(struct usb_serial_port *port); static int xr21v141x_fifo_reset(struct usb_serial_port *port); static void xr21v141x_set_line_settings(struct tty_struct *tty, struct usb_serial_port *port, struct ktermios *old_termios); struct xr_type { int reg_width; u8 reg_recipient; u8 set_reg; u8 get_reg; u16 uart_enable; u16 flow_control; u16 xon_char; u16 xoff_char; u16 tx_break; u16 gpio_mode; u16 gpio_direction; u16 gpio_set; u16 gpio_clear; u16 gpio_status; u16 tx_fifo_reset; u16 rx_fifo_reset; u16 custom_driver; bool have_5_6_bit_mode; bool have_xmit_toggle; int (*enable)(struct usb_serial_port *port); int (*disable)(struct usb_serial_port *port); int (*fifo_reset)(struct usb_serial_port *port); void (*set_line_settings)(struct tty_struct *tty, struct usb_serial_port *port, struct ktermios *old_termios); }; enum xr_type_id { XR21V141X, XR21B142X, XR21B1411, XR2280X, XR_TYPE_COUNT, }; static const struct xr_type xr_types[] = { [XR21V141X] = { .reg_width = 8, .reg_recipient = USB_RECIP_DEVICE, .set_reg = 0x00, .get_reg = 0x01, .uart_enable = 0x03, .flow_control = 0x0c, .xon_char = 0x10, .xoff_char = 0x11, .tx_break = 0x14, .gpio_mode = 0x1a, .gpio_direction = 0x1b, .gpio_set = 0x1d, .gpio_clear = 0x1e, .gpio_status = 0x1f, .enable = xr21v141x_uart_enable, .disable = xr21v141x_uart_disable, .fifo_reset = xr21v141x_fifo_reset, .set_line_settings = xr21v141x_set_line_settings, }, [XR21B142X] = { .reg_width = 16, .reg_recipient = USB_RECIP_INTERFACE, .set_reg = 0x00, .get_reg = 0x00, .uart_enable = 0x00, .flow_control = 0x06, .xon_char = 0x07, .xoff_char = 0x08, .tx_break = 0x0a, .gpio_mode = 0x0c, .gpio_direction = 0x0d, .gpio_set = 0x0e, .gpio_clear = 0x0f, .gpio_status = 0x10, .tx_fifo_reset = 0x40, .rx_fifo_reset = 0x43, .custom_driver = 0x60, .have_5_6_bit_mode = true, .have_xmit_toggle = true, }, [XR21B1411] = { .reg_width = 12, .reg_recipient = USB_RECIP_DEVICE, .set_reg = 0x00, .get_reg = 0x01, .uart_enable = 0xc00, .flow_control = 0xc06, .xon_char = 0xc07, .xoff_char = 0xc08, .tx_break = 0xc0a, .gpio_mode = 0xc0c, .gpio_direction = 0xc0d, .gpio_set = 0xc0e, .gpio_clear = 0xc0f, .gpio_status = 0xc10, .tx_fifo_reset = 0xc80, .rx_fifo_reset = 0xcc0, .custom_driver = 0x20d, }, [XR2280X] = { .reg_width = 16, .reg_recipient = USB_RECIP_DEVICE, .set_reg = 0x05, .get_reg = 0x05, .uart_enable = 0x40, .flow_control = 0x46, .xon_char = 0x47, .xoff_char = 0x48, .tx_break = 0x4a, .gpio_mode = 0x4c, .gpio_direction = 0x4d, .gpio_set = 0x4e, .gpio_clear = 0x4f, .gpio_status = 0x50, .tx_fifo_reset = 0x60, .rx_fifo_reset = 0x63, .custom_driver = 0x81, }, }; struct xr_data { const struct xr_type *type; u8 channel; /* zero-based index or interface number */ }; static int xr_set_reg(struct usb_serial_port *port, u8 channel, u16 reg, u16 val) { struct xr_data *data = usb_get_serial_port_data(port); const struct xr_type *type = data->type; struct usb_serial *serial = port->serial; int ret; ret = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), type->set_reg, USB_DIR_OUT | USB_TYPE_VENDOR | type->reg_recipient, val, (channel << 8) | reg, NULL, 0, USB_CTRL_SET_TIMEOUT); if (ret < 0) { dev_err(&port->dev, "Failed to set reg 0x%02x: %d\n", reg, ret); return ret; } return 0; } static int xr_get_reg(struct usb_serial_port *port, u8 channel, u16 reg, u16 *val) { struct xr_data *data = usb_get_serial_port_data(port); const struct xr_type *type = data->type; struct usb_serial *serial = port->serial; u8 *dmabuf; int ret, len; if (type->reg_width == 8) len = 1; else len = 2; dmabuf = kmalloc(len, GFP_KERNEL); if (!dmabuf) return -ENOMEM; ret = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), type->get_reg, USB_DIR_IN | USB_TYPE_VENDOR | type->reg_recipient, 0, (channel << 8) | reg, dmabuf, len, USB_CTRL_GET_TIMEOUT); if (ret == len) { if (len == 2) *val = le16_to_cpup((__le16 *)dmabuf); else *val = *dmabuf; ret = 0; } else { dev_err(&port->dev, "Failed to get reg 0x%02x: %d\n", reg, ret); if (ret >= 0) ret = -EIO; } kfree(dmabuf); return ret; } static int xr_set_reg_uart(struct usb_serial_port *port, u16 reg, u16 val) { struct xr_data *data = usb_get_serial_port_data(port); return xr_set_reg(port, data->channel, reg, val); } static int xr_get_reg_uart(struct usb_serial_port *port, u16 reg, u16 *val) { struct xr_data *data = usb_get_serial_port_data(port); return xr_get_reg(port, data->channel, reg, val); } static int xr_set_reg_um(struct usb_serial_port *port, u8 reg_base, u8 val) { struct xr_data *data = usb_get_serial_port_data(port); u8 reg; reg = reg_base + data->channel; return xr_set_reg(port, XR21V141X_UM_REG_BLOCK, reg, val); } static int __xr_uart_enable(struct usb_serial_port *port) { struct xr_data *data = usb_get_serial_port_data(port); return xr_set_reg_uart(port, data->type->uart_enable, XR_UART_ENABLE_TX | XR_UART_ENABLE_RX); } static int __xr_uart_disable(struct usb_serial_port *port) { struct xr_data *data = usb_get_serial_port_data(port); return xr_set_reg_uart(port, data->type->uart_enable, 0); } /* * According to datasheet, below is the recommended sequence for enabling UART * module in XR21V141X: * * Enable Tx FIFO * Enable Tx and Rx * Enable Rx FIFO */ static int xr21v141x_uart_enable(struct usb_serial_port *port) { int ret; ret = xr_set_reg_um(port, XR21V141X_UM_FIFO_ENABLE_REG, XR21V141X_UM_ENABLE_TX_FIFO); if (ret) return ret; ret = __xr_uart_enable(port); if (ret) return ret; ret = xr_set_reg_um(port, XR21V141X_UM_FIFO_ENABLE_REG, XR21V141X_UM_ENABLE_TX_FIFO | XR21V141X_UM_ENABLE_RX_FIFO); if (ret) __xr_uart_disable(port); return ret; } static int xr21v141x_uart_disable(struct usb_serial_port *port) { int ret; ret = __xr_uart_disable(port); if (ret) return ret; ret = xr_set_reg_um(port, XR21V141X_UM_FIFO_ENABLE_REG, 0); return ret; } static int xr_uart_enable(struct usb_serial_port *port) { struct xr_data *data = usb_get_serial_port_data(port); if (data->type->enable) return data->type->enable(port); return __xr_uart_enable(port); } static int xr_uart_disable(struct usb_serial_port *port) { struct xr_data *data = usb_get_serial_port_data(port); if (data->type->disable) return data->type->disable(port); return __xr_uart_disable(port); } static int xr21v141x_fifo_reset(struct usb_serial_port *port) { int ret; ret = xr_set_reg_um(port, XR21V141X_UM_TX_FIFO_RESET, XR_FIFO_RESET); if (ret) return ret; ret = xr_set_reg_um(port, XR21V141X_UM_RX_FIFO_RESET, XR_FIFO_RESET); if (ret) return ret; return 0; } static int xr_fifo_reset(struct usb_serial_port *port) { struct xr_data *data = usb_get_serial_port_data(port); int ret; if (data->type->fifo_reset) return data->type->fifo_reset(port); ret = xr_set_reg_uart(port, data->type->tx_fifo_reset, XR_FIFO_RESET); if (ret) return ret; ret = xr_set_reg_uart(port, data->type->rx_fifo_reset, XR_FIFO_RESET); if (ret) return ret; return 0; } static int xr_tiocmget(struct tty_struct *tty) { struct usb_serial_port *port = tty->driver_data; struct xr_data *data = usb_get_serial_port_data(port); u16 status; int ret; ret = xr_get_reg_uart(port, data->type->gpio_status, &status); if (ret) return ret; /* * Modem control pins are active low, so reading '0' means it is active * and '1' means not active. */ ret = ((status & XR_GPIO_DTR) ? 0 : TIOCM_DTR) | ((status & XR_GPIO_RTS) ? 0 : TIOCM_RTS) | ((status & XR_GPIO_CTS) ? 0 : TIOCM_CTS) | ((status & XR_GPIO_DSR) ? 0 : TIOCM_DSR) | ((status & XR_GPIO_RI) ? 0 : TIOCM_RI) | ((status & XR_GPIO_CD) ? 0 : TIOCM_CD); return ret; } static int xr_tiocmset_port(struct usb_serial_port *port, unsigned int set, unsigned int clear) { struct xr_data *data = usb_get_serial_port_data(port); const struct xr_type *type = data->type; u16 gpio_set = 0; u16 gpio_clr = 0; int ret = 0; /* Modem control pins are active low, so set & clr are swapped */ if (set & TIOCM_RTS) gpio_clr |= XR_GPIO_RTS; if (set & TIOCM_DTR) gpio_clr |= XR_GPIO_DTR; if (clear & TIOCM_RTS) gpio_set |= XR_GPIO_RTS; if (clear & TIOCM_DTR) gpio_set |= XR_GPIO_DTR; /* Writing '0' to gpio_{set/clr} bits has no effect, so no need to do */ if (gpio_clr) ret = xr_set_reg_uart(port, type->gpio_clear, gpio_clr); if (gpio_set) ret = xr_set_reg_uart(port, type->gpio_set, gpio_set); return ret; } static int xr_tiocmset(struct tty_struct *tty, unsigned int set, unsigned int clear) { struct usb_serial_port *port = tty->driver_data; return xr_tiocmset_port(port, set, clear); } static void xr_dtr_rts(struct usb_serial_port *port, int on) { if (on) xr_tiocmset_port(port, TIOCM_DTR | TIOCM_RTS, 0); else xr_tiocmset_port(port, 0, TIOCM_DTR | TIOCM_RTS); } static void xr_break_ctl(struct tty_struct *tty, int break_state) { struct usb_serial_port *port = tty->driver_data; struct xr_data *data = usb_get_serial_port_data(port); const struct xr_type *type = data->type; u16 state; if (break_state == 0) state = 0; else state = GENMASK(type->reg_width - 1, 0); dev_dbg(&port->dev, "Turning break %s\n", state == 0 ? "off" : "on"); xr_set_reg_uart(port, type->tx_break, state); } /* Tx and Rx clock mask values obtained from section 3.3.4 of datasheet */ static const struct xr_txrx_clk_mask xr21v141x_txrx_clk_masks[] = { { 0x000, 0x000, 0x000 }, { 0x000, 0x000, 0x000 }, { 0x100, 0x000, 0x100 }, { 0x020, 0x400, 0x020 }, { 0x010, 0x100, 0x010 }, { 0x208, 0x040, 0x208 }, { 0x104, 0x820, 0x108 }, { 0x844, 0x210, 0x884 }, { 0x444, 0x110, 0x444 }, { 0x122, 0x888, 0x224 }, { 0x912, 0x448, 0x924 }, { 0x492, 0x248, 0x492 }, { 0x252, 0x928, 0x292 }, { 0x94a, 0x4a4, 0xa52 }, { 0x52a, 0xaa4, 0x54a }, { 0xaaa, 0x954, 0x4aa }, { 0xaaa, 0x554, 0xaaa }, { 0x555, 0xad4, 0x5aa }, { 0xb55, 0xab4, 0x55a }, { 0x6b5, 0x5ac, 0xb56 }, { 0x5b5, 0xd6c, 0x6d6 }, { 0xb6d, 0xb6a, 0xdb6 }, { 0x76d, 0x6da, 0xbb6 }, { 0xedd, 0xdda, 0x76e }, { 0xddd, 0xbba, 0xeee }, { 0x7bb, 0xf7a, 0xdde }, { 0xf7b, 0xef6, 0x7de }, { 0xdf7, 0xbf6, 0xf7e }, { 0x7f7, 0xfee, 0xefe }, { 0xfdf, 0xfbe, 0x7fe }, { 0xf7f, 0xefe, 0xffe }, { 0xfff, 0xffe, 0xffd }, }; static int xr21v141x_set_baudrate(struct tty_struct *tty, struct usb_serial_port *port) { u32 divisor, baud, idx; u16 tx_mask, rx_mask; int ret; baud = tty->termios.c_ospeed; if (!baud) return 0; baud = clamp(baud, XR21V141X_MIN_SPEED, XR21V141X_MAX_SPEED); divisor = XR_INT_OSC_HZ / baud; idx = ((32 * XR_INT_OSC_HZ) / baud) & 0x1f; tx_mask = xr21v141x_txrx_clk_masks[idx].tx; if (divisor & 0x01) rx_mask = xr21v141x_txrx_clk_masks[idx].rx1; else rx_mask = xr21v141x_txrx_clk_masks[idx].rx0; dev_dbg(&port->dev, "Setting baud rate: %u\n", baud); /* * XR21V141X uses fractional baud rate generator with 48MHz internal * oscillator and 19-bit programmable divisor. So theoretically it can * generate most commonly used baud rates with high accuracy. */ ret = xr_set_reg_uart(port, XR21V141X_CLOCK_DIVISOR_0, divisor & 0xff); if (ret) return ret; ret = xr_set_reg_uart(port, XR21V141X_CLOCK_DIVISOR_1, (divisor >> 8) & 0xff); if (ret) return ret; ret = xr_set_reg_uart(port, XR21V141X_CLOCK_DIVISOR_2, (divisor >> 16) & 0xff); if (ret) return ret; ret = xr_set_reg_uart(port, XR21V141X_TX_CLOCK_MASK_0, tx_mask & 0xff); if (ret) return ret; ret = xr_set_reg_uart(port, XR21V141X_TX_CLOCK_MASK_1, (tx_mask >> 8) & 0xff); if (ret) return ret; ret = xr_set_reg_uart(port, XR21V141X_RX_CLOCK_MASK_0, rx_mask & 0xff); if (ret) return ret; ret = xr_set_reg_uart(port, XR21V141X_RX_CLOCK_MASK_1, (rx_mask >> 8) & 0xff); if (ret) return ret; tty_encode_baud_rate(tty, baud, baud); return 0; } static void xr_set_flow_mode(struct tty_struct *tty, struct usb_serial_port *port, struct ktermios *old_termios) { struct xr_data *data = usb_get_serial_port_data(port); const struct xr_type *type = data->type; u16 flow, gpio_mode; int ret; ret = xr_get_reg_uart(port, type->gpio_mode, &gpio_mode); if (ret) return; /* * According to the datasheets, the UART needs to be disabled while * writing to the FLOW_CONTROL register (XR21V141X), or any register * but GPIO_SET, GPIO_CLEAR, TX_BREAK and ERROR_STATUS (XR21B142X). */ xr_uart_disable(port); /* Set GPIO mode for controlling the pins manually by default. */ gpio_mode &= ~XR_GPIO_MODE_SEL_MASK; if (C_CRTSCTS(tty) && C_BAUD(tty) != B0) { dev_dbg(&port->dev, "Enabling hardware flow ctrl\n"); gpio_mode |= XR_GPIO_MODE_SEL_RTS_CTS; flow = XR_UART_FLOW_MODE_HW; } else if (I_IXON(tty)) { u8 start_char = START_CHAR(tty); u8 stop_char = STOP_CHAR(tty); dev_dbg(&port->dev, "Enabling sw flow ctrl\n"); flow = XR_UART_FLOW_MODE_SW; xr_set_reg_uart(port, type->xon_char, start_char); xr_set_reg_uart(port, type->xoff_char, stop_char); } else { dev_dbg(&port->dev, "Disabling flow ctrl\n"); flow = XR_UART_FLOW_MODE_NONE; } xr_set_reg_uart(port, type->flow_control, flow); xr_set_reg_uart(port, type->gpio_mode, gpio_mode); xr_uart_enable(port); if (C_BAUD(tty) == B0) xr_dtr_rts(port, 0); else if (old_termios && (old_termios->c_cflag & CBAUD) == B0) xr_dtr_rts(port, 1); } static void xr21v141x_set_line_settings(struct tty_struct *tty, struct usb_serial_port *port, struct ktermios *old_termios) { struct ktermios *termios = &tty->termios; u8 bits = 0; int ret; if (!old_termios || (tty->termios.c_ospeed != old_termios->c_ospeed)) xr21v141x_set_baudrate(tty, port); switch (C_CSIZE(tty)) { case CS5: case CS6: /* CS5 and CS6 are not supported, so just restore old setting */ termios->c_cflag &= ~CSIZE; if (old_termios) termios->c_cflag |= old_termios->c_cflag & CSIZE; else termios->c_cflag |= CS8; if (C_CSIZE(tty) == CS7) bits |= XR_UART_DATA_7; else bits |= XR_UART_DATA_8; break; case CS7: bits |= XR_UART_DATA_7; break; case CS8: default: bits |= XR_UART_DATA_8; break; } if (C_PARENB(tty)) { if (C_CMSPAR(tty)) { if (C_PARODD(tty)) bits |= XR_UART_PARITY_MARK; else bits |= XR_UART_PARITY_SPACE; } else { if (C_PARODD(tty)) bits |= XR_UART_PARITY_ODD; else bits |= XR_UART_PARITY_EVEN; } } if (C_CSTOPB(tty)) bits |= XR_UART_STOP_2; else bits |= XR_UART_STOP_1; ret = xr_set_reg_uart(port, XR21V141X_REG_FORMAT, bits); if (ret) return; } static void xr_cdc_set_line_coding(struct tty_struct *tty, struct usb_serial_port *port, struct ktermios *old_termios) { struct xr_data *data = usb_get_serial_port_data(port); struct usb_host_interface *alt = port->serial->interface->cur_altsetting; struct usb_device *udev = port->serial->dev; struct usb_cdc_line_coding *lc; int ret; lc = kzalloc(sizeof(*lc), GFP_KERNEL); if (!lc) return; if (tty->termios.c_ospeed) lc->dwDTERate = cpu_to_le32(tty->termios.c_ospeed); else if (old_termios) lc->dwDTERate = cpu_to_le32(old_termios->c_ospeed); else lc->dwDTERate = cpu_to_le32(9600); if (C_CSTOPB(tty)) lc->bCharFormat = USB_CDC_2_STOP_BITS; else lc->bCharFormat = USB_CDC_1_STOP_BITS; if (C_PARENB(tty)) { if (C_CMSPAR(tty)) { if (C_PARODD(tty)) lc->bParityType = USB_CDC_MARK_PARITY; else lc->bParityType = USB_CDC_SPACE_PARITY; } else { if (C_PARODD(tty)) lc->bParityType = USB_CDC_ODD_PARITY; else lc->bParityType = USB_CDC_EVEN_PARITY; } } else { lc->bParityType = USB_CDC_NO_PARITY; } if (!data->type->have_5_6_bit_mode && (C_CSIZE(tty) == CS5 || C_CSIZE(tty) == CS6)) { tty->termios.c_cflag &= ~CSIZE; if (old_termios) tty->termios.c_cflag |= old_termios->c_cflag & CSIZE; else tty->termios.c_cflag |= CS8; } switch (C_CSIZE(tty)) { case CS5: lc->bDataBits = 5; break; case CS6: lc->bDataBits = 6; break; case CS7: lc->bDataBits = 7; break; case CS8: default: lc->bDataBits = 8; break; } ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), USB_CDC_REQ_SET_LINE_CODING, USB_TYPE_CLASS | USB_RECIP_INTERFACE, 0, alt->desc.bInterfaceNumber, lc, sizeof(*lc), USB_CTRL_SET_TIMEOUT); if (ret < 0) dev_err(&port->dev, "Failed to set line coding: %d\n", ret); kfree(lc); } static void xr_set_termios(struct tty_struct *tty, struct usb_serial_port *port, struct ktermios *old_termios) { struct xr_data *data = usb_get_serial_port_data(port); /* * XR21V141X does not have a CUSTOM_DRIVER flag and always enters CDC * mode upon receiving CDC requests. */ if (data->type->set_line_settings) data->type->set_line_settings(tty, port, old_termios); else xr_cdc_set_line_coding(tty, port, old_termios); xr_set_flow_mode(tty, port, old_termios); } static int xr_open(struct tty_struct *tty, struct usb_serial_port *port) { int ret; ret = xr_fifo_reset(port); if (ret) return ret; ret = xr_uart_enable(port); if (ret) { dev_err(&port->dev, "Failed to enable UART\n"); return ret; } /* Setup termios */ if (tty) xr_set_termios(tty, port, NULL); ret = usb_serial_generic_open(tty, port); if (ret) { xr_uart_disable(port); return ret; } return 0; } static void xr_close(struct usb_serial_port *port) { usb_serial_generic_close(port); xr_uart_disable(port); } static int xr_probe(struct usb_serial *serial, const struct usb_device_id *id) { struct usb_interface *control = serial->interface; struct usb_host_interface *alt = control->cur_altsetting; struct usb_cdc_parsed_header hdrs; struct usb_cdc_union_desc *desc; struct usb_interface *data; int ret; ret = cdc_parse_cdc_header(&hdrs, control, alt->extra, alt->extralen); if (ret < 0) return -ENODEV; desc = hdrs.usb_cdc_union_desc; if (!desc) return -ENODEV; data = usb_ifnum_to_if(serial->dev, desc->bSlaveInterface0); if (!data) return -ENODEV; ret = usb_serial_claim_interface(serial, data); if (ret) return ret; usb_set_serial_data(serial, (void *)id->driver_info); return 0; } static int xr_gpio_init(struct usb_serial_port *port, const struct xr_type *type) { u16 mask, mode; int ret; /* * Configure all pins as GPIO except for Receive and Transmit Toggle. */ mode = 0; if (type->have_xmit_toggle) mode |= XR_GPIO_MODE_RX_TOGGLE | XR_GPIO_MODE_TX_TOGGLE; ret = xr_set_reg_uart(port, type->gpio_mode, mode); if (ret) return ret; /* * Configure DTR and RTS as outputs and make sure they are deasserted * (active low), and configure RI, CD, DSR and CTS as inputs. */ mask = XR_GPIO_DTR | XR_GPIO_RTS; ret = xr_set_reg_uart(port, type->gpio_direction, mask); if (ret) return ret; ret = xr_set_reg_uart(port, type->gpio_set, mask); if (ret) return ret; return 0; } static int xr_port_probe(struct usb_serial_port *port) { struct usb_interface_descriptor *desc; const struct xr_type *type; struct xr_data *data; enum xr_type_id type_id; int ret; type_id = (int)(unsigned long)usb_get_serial_data(port->serial); type = &xr_types[type_id]; data = kzalloc(sizeof(*data), GFP_KERNEL); if (!data) return -ENOMEM; data->type = type; desc = &port->serial->interface->cur_altsetting->desc; if (type_id == XR21V141X) data->channel = desc->bInterfaceNumber / 2; else data->channel = desc->bInterfaceNumber; usb_set_serial_port_data(port, data); if (type->custom_driver) { ret = xr_set_reg_uart(port, type->custom_driver, XR_CUSTOM_DRIVER_ACTIVE); if (ret) goto err_free; } ret = xr_gpio_init(port, type); if (ret) goto err_free; return 0; err_free: kfree(data); return ret; } static void xr_port_remove(struct usb_serial_port *port) { struct xr_data *data = usb_get_serial_port_data(port); kfree(data); } #define XR_DEVICE(vid, pid, type) \ USB_DEVICE_INTERFACE_CLASS((vid), (pid), USB_CLASS_COMM), \ .driver_info = (type) static const struct usb_device_id id_table[] = { { XR_DEVICE(0x04e2, 0x1400, XR2280X) }, { XR_DEVICE(0x04e2, 0x1401, XR2280X) }, { XR_DEVICE(0x04e2, 0x1402, XR2280X) }, { XR_DEVICE(0x04e2, 0x1403, XR2280X) }, { XR_DEVICE(0x04e2, 0x1410, XR21V141X) }, { XR_DEVICE(0x04e2, 0x1411, XR21B1411) }, { XR_DEVICE(0x04e2, 0x1412, XR21V141X) }, { XR_DEVICE(0x04e2, 0x1414, XR21V141X) }, { XR_DEVICE(0x04e2, 0x1420, XR21B142X) }, { XR_DEVICE(0x04e2, 0x1422, XR21B142X) }, { XR_DEVICE(0x04e2, 0x1424, XR21B142X) }, { } }; MODULE_DEVICE_TABLE(usb, id_table); static struct usb_serial_driver xr_device = { .driver = { .owner = THIS_MODULE, .name = "xr_serial", }, .id_table = id_table, .num_ports = 1, .probe = xr_probe, .port_probe = xr_port_probe, .port_remove = xr_port_remove, .open = xr_open, .close = xr_close, .break_ctl = xr_break_ctl, .set_termios = xr_set_termios, .tiocmget = xr_tiocmget, .tiocmset = xr_tiocmset, .dtr_rts = xr_dtr_rts }; static struct usb_serial_driver * const serial_drivers[] = { &xr_device, NULL }; module_usb_serial_driver(serial_drivers, id_table); MODULE_AUTHOR("Manivannan Sadhasivam <mani@kernel.org>"); MODULE_DESCRIPTION("MaxLinear/Exar USB to Serial driver"); MODULE_LICENSE("GPL"); |