projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | /* |
| 2 | * hvconsole.c | |
| 3 | * Copyright (C) 2004 Hollis Blanchard, IBM Corporation | |
| 4 | * Copyright (C) 2004 IBM Corporation | |
| 5 | * | |
| 6 | * Additional Author(s): | |
| 7 | * Ryan S. Arnold <rsa@us.ibm.com> | |
| 8 | * | |
| 9 | * LPAR console support. | |
| 10 | * | |
| 11 | * This program is free software; you can redistribute it and/or modify | |
| 12 | * it under the terms of the GNU General Public License as published by | |
| 13 | * the Free Software Foundation; either version 2 of the License, or | |
| 14 | * (at your option) any later version. | |
| 15 | * | |
| 16 | * This program is distributed in the hope that it will be useful, | |
| 17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 19 | * GNU General Public License for more details. | |
| 20 | * | |
| 21 | * You should have received a copy of the GNU General Public License | |
| 22 | * along with this program; if not, write to the Free Software | |
| 23 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 24 | */ | |
| 25 | ||
| 26 | #include <linux/kernel.h> | |
| 27 | #include <linux/module.h> | |
| 28 | #include <asm/hvcall.h> | |
| 29 | #include <asm/hvconsole.h> | |
| 1da177e4 LT |
30 | |
| 31 | /** | |
| 32 | * hvc_get_chars - retrieve characters from firmware for denoted vterm adatper | |
| 33 | * @vtermno: The vtermno or unit_address of the adapter from which to fetch the | |
| 34 | * data. | |
| 35 | * @buf: The character buffer into which to put the character data fetched from | |
| 36 | * firmware. | |
| 37 | * @count: not used? | |
| 38 | */ | |
| 39 | int hvc_get_chars(uint32_t vtermno, char *buf, int count) | |
| 40 | { | |
| 41 | unsigned long got; | |
| 42 | ||
| 43 | if (plpar_hcall(H_GET_TERM_CHAR, vtermno, 0, 0, 0, &got, | |
| 44 | (unsigned long *)buf, (unsigned long *)buf+1) == H_Success) { | |
| 45 | /* | |
| 46 | * Work around a HV bug where it gives us a null | |
| 47 | * after every \r. -- paulus | |
| 48 | */ | |
| 49 | if (got > 0) { | |
| 50 | int i; | |
| 51 | for (i = 1; i < got; ++i) { | |
| 52 | if (buf[i] == 0 && buf[i-1] == '\r') { | |
| 53 | --got; | |
| 54 | if (i < got) | |
| 55 | memmove(&buf[i], &buf[i+1], | |
| 56 | got - i); | |
| 57 | } | |
| 58 | } | |
| 59 | } | |
| 60 | return got; | |
| 61 | } | |
| 62 | return 0; | |
| 63 | } | |
| 64 | ||
| 65 | EXPORT_SYMBOL(hvc_get_chars); | |
| 66 | ||
| 67 | /** | |
| 68 | * hvc_put_chars: send characters to firmware for denoted vterm adapter | |
| 69 | * @vtermno: The vtermno or unit_address of the adapter from which the data | |
| 70 | * originated. | |
| 71 | * @buf: The character buffer that contains the character data to send to | |
| 72 | * firmware. | |
| 73 | * @count: Send this number of characters. | |
| 74 | */ | |
| 75 | int hvc_put_chars(uint32_t vtermno, const char *buf, int count) | |
| 76 | { | |
| 77 | unsigned long *lbuf = (unsigned long *) buf; | |
| 78 | long ret; | |
| 79 | ||
| 80 | ret = plpar_hcall_norets(H_PUT_TERM_CHAR, vtermno, count, lbuf[0], | |
| 81 | lbuf[1]); | |
| 82 | if (ret == H_Success) | |
| 83 | return count; | |
| 84 | if (ret == H_Busy) | |
| 85 | return 0; | |
| 86 | return -EIO; | |
| 87 | } | |
| 88 | ||
| 89 | EXPORT_SYMBOL(hvc_put_chars); |