1 /* $NetBSD: nouveau_nvkm_subdev_mxm_mxms.c,v 1.4 2021/12/18 23:45:41 riastradh Exp $ */ 2 3 /* 4 * Copyright 2012 Red Hat Inc. 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a 7 * copy of this software and associated documentation files (the "Software"), 8 * to deal in the Software without restriction, including without limitation 9 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 10 * and/or sell copies of the Software, and to permit persons to whom the 11 * Software is furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice shall be included in 14 * all copies or substantial portions of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 19 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR 20 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 21 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 22 * OTHER DEALINGS IN THE SOFTWARE. 23 * 24 * Authors: Ben Skeggs 25 */ 26 #include <sys/cdefs.h> 27 __KERNEL_RCSID(0, "$NetBSD: nouveau_nvkm_subdev_mxm_mxms.c,v 1.4 2021/12/18 23:45:41 riastradh Exp $"); 28 29 #include "mxms.h" 30 31 #define ROM16(x) get_unaligned_le16(&(x)) 32 #define ROM32(x) get_unaligned_le32(&(x)) 33 34 static u8 * 35 mxms_data(struct nvkm_mxm *mxm) 36 { 37 return mxm->mxms; 38 39 } 40 41 u16 42 mxms_version(struct nvkm_mxm *mxm) 43 { 44 u8 *mxms = mxms_data(mxm); 45 u16 version = (mxms[4] << 8) | mxms[5]; 46 switch (version ) { 47 case 0x0200: 48 case 0x0201: 49 case 0x0300: 50 return version; 51 default: 52 break; 53 } 54 55 nvkm_debug(&mxm->subdev, "unknown version %d.%d\n", mxms[4], mxms[5]); 56 return 0x0000; 57 } 58 59 u16 60 mxms_headerlen(struct nvkm_mxm *mxm) 61 { 62 return 8; 63 } 64 65 u16 66 mxms_structlen(struct nvkm_mxm *mxm) 67 { 68 return *(u16 *)&mxms_data(mxm)[6]; 69 } 70 71 bool 72 mxms_checksum(struct nvkm_mxm *mxm) 73 { 74 u16 size = mxms_headerlen(mxm) + mxms_structlen(mxm); 75 u8 *mxms = mxms_data(mxm), sum = 0; 76 while (size--) 77 sum += *mxms++; 78 if (sum) { 79 nvkm_debug(&mxm->subdev, "checksum invalid\n"); 80 return false; 81 } 82 return true; 83 } 84 85 bool 86 mxms_valid(struct nvkm_mxm *mxm) 87 { 88 u8 *mxms = mxms_data(mxm); 89 if (*(u32 *)mxms != 0x5f4d584d) { 90 nvkm_debug(&mxm->subdev, "signature invalid\n"); 91 return false; 92 } 93 94 if (!mxms_version(mxm) || !mxms_checksum(mxm)) 95 return false; 96 97 return true; 98 } 99 100 bool 101 mxms_foreach(struct nvkm_mxm *mxm, u8 types, 102 bool (*exec)(struct nvkm_mxm *, u8 *, void *), void *info) 103 { 104 struct nvkm_subdev *subdev = &mxm->subdev; 105 u8 *mxms = mxms_data(mxm); 106 u8 *desc = mxms + mxms_headerlen(mxm); 107 u8 *fini = desc + mxms_structlen(mxm) - 1; 108 while (desc < fini) { 109 u8 type = desc[0] & 0x0f; 110 u8 headerlen = 0; 111 u8 recordlen = 0; 112 u8 entries = 0; 113 114 switch (type) { 115 case 0: /* Output Device Structure */ 116 if (mxms_version(mxm) >= 0x0300) 117 headerlen = 8; 118 else 119 headerlen = 6; 120 break; 121 case 1: /* System Cooling Capability Structure */ 122 case 2: /* Thermal Structure */ 123 case 3: /* Input Power Structure */ 124 headerlen = 4; 125 break; 126 case 4: /* GPIO Device Structure */ 127 headerlen = 4; 128 recordlen = 2; 129 entries = (ROM32(desc[0]) & 0x01f00000) >> 20; 130 break; 131 case 5: /* Vendor Specific Structure */ 132 headerlen = 8; 133 break; 134 case 6: /* Backlight Control Structure */ 135 if (mxms_version(mxm) >= 0x0300) { 136 headerlen = 4; 137 recordlen = 8; 138 entries = (desc[1] & 0xf0) >> 4; 139 } else { 140 headerlen = 8; 141 } 142 break; 143 case 7: /* Fan Control Structure */ 144 headerlen = 8; 145 recordlen = 4; 146 entries = desc[1] & 0x07; 147 break; 148 default: 149 nvkm_debug(subdev, "unknown descriptor type %d\n", type); 150 return false; 151 } 152 153 if (mxm->subdev.debug >= NV_DBG_DEBUG && (exec == NULL)) { 154 static const char * mxms_desc[] = { 155 "ODS", "SCCS", "TS", "IPS", 156 "GSD", "VSS", "BCS", "FCS", 157 }; 158 u8 *dump = desc; 159 char data[32], *ptr; 160 int i, j; 161 162 for (j = headerlen - 1, ptr = data; j >= 0; j--) 163 ptr += snprintf(ptr, sizeof data - (ptr - data), 164 "%02x", dump[j]); 165 dump += headerlen; 166 167 nvkm_debug(subdev, "%4s: %s\n", mxms_desc[type], data); 168 for (i = 0; i < entries; i++, dump += recordlen) { 169 for (j = recordlen - 1, ptr = data; j >= 0; j--) 170 ptr += snprintf(ptr, sizeof data - 171 (ptr - data), "%02x", dump[j]); 172 nvkm_debug(subdev, " %s\n", data); 173 } 174 } 175 176 if ((types & (1 << type)) && (exec != NULL)) { 177 if (!exec(mxm, desc, info)) 178 return false; 179 } 180 181 desc += headerlen + (entries * recordlen); 182 } 183 184 return true; 185 } 186 187 void 188 mxms_output_device(struct nvkm_mxm *mxm, u8 *pdata, struct mxms_odev *desc) 189 { 190 u64 data = ROM32(pdata[0]); 191 if (mxms_version(mxm) >= 0x0300) 192 data |= (u64)ROM16(pdata[4]) << 32; 193 194 desc->outp_type = (data & 0x00000000000000f0ULL) >> 4; 195 desc->ddc_port = (data & 0x0000000000000f00ULL) >> 8; 196 desc->conn_type = (data & 0x000000000001f000ULL) >> 12; 197 desc->dig_conn = (data & 0x0000000000780000ULL) >> 19; 198 } 199
Indexes created Sat Sep 20 22:09:52 GMT 2025