| 1 | /* $NetBSD: nouveau_subdev_i2c_base.c,v 1.1.1.1 2014/08/06 12:36:30 riastradh Exp $ */ |
| 2 | |
| 3 | /* |
| 4 | * Copyright 2013 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 | |
| 27 | #include <sys/cdefs.h> |
| 28 | __KERNEL_RCSID(0, "$NetBSD: nouveau_subdev_i2c_base.c,v 1.1.1.1 2014/08/06 12:36:30 riastradh Exp $" ); |
| 29 | |
| 30 | #include <core/option.h> |
| 31 | |
| 32 | #include <subdev/bios.h> |
| 33 | #include <subdev/bios/dcb.h> |
| 34 | #include <subdev/bios/i2c.h> |
| 35 | #include <subdev/i2c.h> |
| 36 | #include <subdev/vga.h> |
| 37 | |
| 38 | /****************************************************************************** |
| 39 | * interface to linux i2c bit-banging algorithm |
| 40 | *****************************************************************************/ |
| 41 | |
| 42 | #ifdef CONFIG_NOUVEAU_I2C_INTERNAL_DEFAULT |
| 43 | #define CSTMSEL true |
| 44 | #else |
| 45 | #define CSTMSEL false |
| 46 | #endif |
| 47 | |
| 48 | static int |
| 49 | nouveau_i2c_pre_xfer(struct i2c_adapter *adap) |
| 50 | { |
| 51 | struct i2c_algo_bit_data *bit = adap->algo_data; |
| 52 | struct nouveau_i2c_port *port = bit->data; |
| 53 | if (port->func->acquire) |
| 54 | port->func->acquire(port); |
| 55 | return 0; |
| 56 | } |
| 57 | |
| 58 | static void |
| 59 | nouveau_i2c_setscl(void *data, int state) |
| 60 | { |
| 61 | struct nouveau_i2c_port *port = data; |
| 62 | port->func->drive_scl(port, state); |
| 63 | } |
| 64 | |
| 65 | static void |
| 66 | nouveau_i2c_setsda(void *data, int state) |
| 67 | { |
| 68 | struct nouveau_i2c_port *port = data; |
| 69 | port->func->drive_sda(port, state); |
| 70 | } |
| 71 | |
| 72 | static int |
| 73 | nouveau_i2c_getscl(void *data) |
| 74 | { |
| 75 | struct nouveau_i2c_port *port = data; |
| 76 | return port->func->sense_scl(port); |
| 77 | } |
| 78 | |
| 79 | static int |
| 80 | nouveau_i2c_getsda(void *data) |
| 81 | { |
| 82 | struct nouveau_i2c_port *port = data; |
| 83 | return port->func->sense_sda(port); |
| 84 | } |
| 85 | |
| 86 | /****************************************************************************** |
| 87 | * base i2c "port" class implementation |
| 88 | *****************************************************************************/ |
| 89 | |
| 90 | void |
| 91 | _nouveau_i2c_port_dtor(struct nouveau_object *object) |
| 92 | { |
| 93 | struct nouveau_i2c_port *port = (void *)object; |
| 94 | i2c_del_adapter(&port->adapter); |
| 95 | nouveau_object_destroy(&port->base); |
| 96 | } |
| 97 | |
| 98 | int |
| 99 | nouveau_i2c_port_create_(struct nouveau_object *parent, |
| 100 | struct nouveau_object *engine, |
| 101 | struct nouveau_oclass *oclass, u8 index, |
| 102 | const struct i2c_algorithm *algo, |
| 103 | const struct nouveau_i2c_func *func, |
| 104 | int size, void **pobject) |
| 105 | { |
| 106 | struct nouveau_device *device = nv_device(parent); |
| 107 | struct nouveau_i2c *i2c = (void *)engine; |
| 108 | struct nouveau_i2c_port *port; |
| 109 | int ret; |
| 110 | |
| 111 | ret = nouveau_object_create_(parent, engine, oclass, 0, size, pobject); |
| 112 | port = *pobject; |
| 113 | if (ret) |
| 114 | return ret; |
| 115 | |
| 116 | snprintf(port->adapter.name, sizeof(port->adapter.name), |
| 117 | "nouveau-%s-%d" , device->name, index); |
| 118 | port->adapter.owner = THIS_MODULE; |
| 119 | port->adapter.dev.parent = nv_device_base(device); |
| 120 | port->index = index; |
| 121 | port->func = func; |
| 122 | i2c_set_adapdata(&port->adapter, i2c); |
| 123 | |
| 124 | if ( algo == &nouveau_i2c_bit_algo && |
| 125 | !nouveau_boolopt(device->cfgopt, "NvI2C" , CSTMSEL)) { |
| 126 | struct i2c_algo_bit_data *bit; |
| 127 | |
| 128 | bit = kzalloc(sizeof(*bit), GFP_KERNEL); |
| 129 | if (!bit) |
| 130 | return -ENOMEM; |
| 131 | |
| 132 | bit->udelay = 10; |
| 133 | bit->timeout = usecs_to_jiffies(2200); |
| 134 | bit->data = port; |
| 135 | bit->pre_xfer = nouveau_i2c_pre_xfer; |
| 136 | bit->setsda = nouveau_i2c_setsda; |
| 137 | bit->setscl = nouveau_i2c_setscl; |
| 138 | bit->getsda = nouveau_i2c_getsda; |
| 139 | bit->getscl = nouveau_i2c_getscl; |
| 140 | |
| 141 | port->adapter.algo_data = bit; |
| 142 | ret = i2c_bit_add_bus(&port->adapter); |
| 143 | } else { |
| 144 | port->adapter.algo_data = port; |
| 145 | port->adapter.algo = algo; |
| 146 | ret = i2c_add_adapter(&port->adapter); |
| 147 | } |
| 148 | |
| 149 | /* drop port's i2c subdev refcount, i2c handles this itself */ |
| 150 | if (ret == 0) |
| 151 | list_add_tail(&port->head, &i2c->ports); |
| 152 | return ret; |
| 153 | } |
| 154 | |
| 155 | /****************************************************************************** |
| 156 | * base i2c subdev class implementation |
| 157 | *****************************************************************************/ |
| 158 | |
| 159 | static struct nouveau_i2c_port * |
| 160 | nouveau_i2c_find(struct nouveau_i2c *i2c, u8 index) |
| 161 | { |
| 162 | struct nouveau_bios *bios = nouveau_bios(i2c); |
| 163 | struct nouveau_i2c_port *port; |
| 164 | |
| 165 | if (index == NV_I2C_DEFAULT(0) || |
| 166 | index == NV_I2C_DEFAULT(1)) { |
| 167 | u8 ver, hdr, cnt, len; |
| 168 | u16 i2c = dcb_i2c_table(bios, &ver, &hdr, &cnt, &len); |
| 169 | if (i2c && ver >= 0x30) { |
| 170 | u8 auxidx = nv_ro08(bios, i2c + 4); |
| 171 | if (index == NV_I2C_DEFAULT(0)) |
| 172 | index = (auxidx & 0x0f) >> 0; |
| 173 | else |
| 174 | index = (auxidx & 0xf0) >> 4; |
| 175 | } else { |
| 176 | index = 2; |
| 177 | } |
| 178 | } |
| 179 | |
| 180 | list_for_each_entry(port, &i2c->ports, head) { |
| 181 | if (port->index == index) |
| 182 | return port; |
| 183 | } |
| 184 | |
| 185 | return NULL; |
| 186 | } |
| 187 | |
| 188 | static struct nouveau_i2c_port * |
| 189 | nouveau_i2c_find_type(struct nouveau_i2c *i2c, u16 type) |
| 190 | { |
| 191 | struct nouveau_i2c_port *port; |
| 192 | |
| 193 | list_for_each_entry(port, &i2c->ports, head) { |
| 194 | if (nv_hclass(port) == type) |
| 195 | return port; |
| 196 | } |
| 197 | |
| 198 | return NULL; |
| 199 | } |
| 200 | |
| 201 | static int |
| 202 | nouveau_i2c_identify(struct nouveau_i2c *i2c, int index, const char *what, |
| 203 | struct nouveau_i2c_board_info *info, |
| 204 | bool (*match)(struct nouveau_i2c_port *, |
| 205 | struct i2c_board_info *, void *), void *data) |
| 206 | { |
| 207 | struct nouveau_i2c_port *port = nouveau_i2c_find(i2c, index); |
| 208 | int i; |
| 209 | |
| 210 | if (!port) { |
| 211 | nv_debug(i2c, "no bus when probing %s on %d\n" , what, index); |
| 212 | return -ENODEV; |
| 213 | } |
| 214 | |
| 215 | nv_debug(i2c, "probing %ss on bus: %d\n" , what, port->index); |
| 216 | for (i = 0; info[i].dev.addr; i++) { |
| 217 | u8 orig_udelay = 0; |
| 218 | |
| 219 | if ((port->adapter.algo == &i2c_bit_algo) && |
| 220 | (info[i].udelay != 0)) { |
| 221 | struct i2c_algo_bit_data *algo = port->adapter.algo_data; |
| 222 | nv_debug(i2c, "using custom udelay %d instead of %d\n" , |
| 223 | info[i].udelay, algo->udelay); |
| 224 | orig_udelay = algo->udelay; |
| 225 | algo->udelay = info[i].udelay; |
| 226 | } |
| 227 | |
| 228 | if (nv_probe_i2c(port, info[i].dev.addr) && |
| 229 | (!match || match(port, &info[i].dev, data))) { |
| 230 | nv_info(i2c, "detected %s: %s\n" , what, |
| 231 | info[i].dev.type); |
| 232 | return i; |
| 233 | } |
| 234 | |
| 235 | if (orig_udelay) { |
| 236 | struct i2c_algo_bit_data *algo = port->adapter.algo_data; |
| 237 | algo->udelay = orig_udelay; |
| 238 | } |
| 239 | } |
| 240 | |
| 241 | nv_debug(i2c, "no devices found.\n" ); |
| 242 | return -ENODEV; |
| 243 | } |
| 244 | |
| 245 | int |
| 246 | _nouveau_i2c_fini(struct nouveau_object *object, bool suspend) |
| 247 | { |
| 248 | struct nouveau_i2c *i2c = (void *)object; |
| 249 | struct nouveau_i2c_port *port; |
| 250 | int ret; |
| 251 | |
| 252 | list_for_each_entry(port, &i2c->ports, head) { |
| 253 | ret = nv_ofuncs(port)->fini(nv_object(port), suspend); |
| 254 | if (ret && suspend) |
| 255 | goto fail; |
| 256 | } |
| 257 | |
| 258 | return nouveau_subdev_fini(&i2c->base, suspend); |
| 259 | fail: |
| 260 | list_for_each_entry_continue_reverse(port, &i2c->ports, head) { |
| 261 | nv_ofuncs(port)->init(nv_object(port)); |
| 262 | } |
| 263 | |
| 264 | return ret; |
| 265 | } |
| 266 | |
| 267 | int |
| 268 | _nouveau_i2c_init(struct nouveau_object *object) |
| 269 | { |
| 270 | struct nouveau_i2c *i2c = (void *)object; |
| 271 | struct nouveau_i2c_port *port; |
| 272 | int ret; |
| 273 | |
| 274 | ret = nouveau_subdev_init(&i2c->base); |
| 275 | if (ret == 0) { |
| 276 | list_for_each_entry(port, &i2c->ports, head) { |
| 277 | ret = nv_ofuncs(port)->init(nv_object(port)); |
| 278 | if (ret) |
| 279 | goto fail; |
| 280 | } |
| 281 | } |
| 282 | |
| 283 | return ret; |
| 284 | fail: |
| 285 | list_for_each_entry_continue_reverse(port, &i2c->ports, head) { |
| 286 | nv_ofuncs(port)->fini(nv_object(port), false); |
| 287 | } |
| 288 | |
| 289 | return ret; |
| 290 | } |
| 291 | |
| 292 | void |
| 293 | _nouveau_i2c_dtor(struct nouveau_object *object) |
| 294 | { |
| 295 | struct nouveau_i2c *i2c = (void *)object; |
| 296 | struct nouveau_i2c_port *port, *temp; |
| 297 | |
| 298 | list_for_each_entry_safe(port, temp, &i2c->ports, head) { |
| 299 | nouveau_object_ref(NULL, (struct nouveau_object **)&port); |
| 300 | } |
| 301 | |
| 302 | nouveau_subdev_destroy(&i2c->base); |
| 303 | } |
| 304 | |
| 305 | static struct nouveau_oclass * |
| 306 | nouveau_i2c_extdev_sclass[] = { |
| 307 | nouveau_anx9805_sclass, |
| 308 | }; |
| 309 | |
| 310 | int |
| 311 | nouveau_i2c_create_(struct nouveau_object *parent, |
| 312 | struct nouveau_object *engine, |
| 313 | struct nouveau_oclass *oclass, |
| 314 | struct nouveau_oclass *sclass, |
| 315 | int length, void **pobject) |
| 316 | { |
| 317 | struct nouveau_bios *bios = nouveau_bios(parent); |
| 318 | struct nouveau_i2c *i2c; |
| 319 | struct nouveau_object *object; |
| 320 | struct dcb_i2c_entry info; |
| 321 | int ret, i, j, index = -1; |
| 322 | struct dcb_output outp; |
| 323 | u8 ver, hdr; |
| 324 | u32 data; |
| 325 | |
| 326 | ret = nouveau_subdev_create(parent, engine, oclass, 0, |
| 327 | "I2C" , "i2c" , &i2c); |
| 328 | *pobject = nv_object(i2c); |
| 329 | if (ret) |
| 330 | return ret; |
| 331 | |
| 332 | i2c->find = nouveau_i2c_find; |
| 333 | i2c->find_type = nouveau_i2c_find_type; |
| 334 | i2c->identify = nouveau_i2c_identify; |
| 335 | INIT_LIST_HEAD(&i2c->ports); |
| 336 | |
| 337 | while (!dcb_i2c_parse(bios, ++index, &info)) { |
| 338 | if (info.type == DCB_I2C_UNUSED) |
| 339 | continue; |
| 340 | |
| 341 | oclass = sclass; |
| 342 | do { |
| 343 | ret = -EINVAL; |
| 344 | if (oclass->handle == info.type) { |
| 345 | ret = nouveau_object_ctor(*pobject, *pobject, |
| 346 | oclass, &info, |
| 347 | index, &object); |
| 348 | } |
| 349 | } while (ret && (++oclass)->handle); |
| 350 | } |
| 351 | |
| 352 | /* in addition to the busses specified in the i2c table, there |
| 353 | * may be ddc/aux channels hiding behind external tmds/dp/etc |
| 354 | * transmitters. |
| 355 | */ |
| 356 | index = ((index + 0x0f) / 0x10) * 0x10; |
| 357 | i = -1; |
| 358 | while ((data = dcb_outp_parse(bios, ++i, &ver, &hdr, &outp))) { |
| 359 | if (!outp.location || !outp.extdev) |
| 360 | continue; |
| 361 | |
| 362 | switch (outp.type) { |
| 363 | case DCB_OUTPUT_TMDS: |
| 364 | info.type = NV_I2C_TYPE_EXTDDC(outp.extdev); |
| 365 | break; |
| 366 | case DCB_OUTPUT_DP: |
| 367 | info.type = NV_I2C_TYPE_EXTAUX(outp.extdev); |
| 368 | break; |
| 369 | default: |
| 370 | continue; |
| 371 | } |
| 372 | |
| 373 | ret = -ENODEV; |
| 374 | j = -1; |
| 375 | while (ret && ++j < ARRAY_SIZE(nouveau_i2c_extdev_sclass)) { |
| 376 | parent = nv_object(i2c->find(i2c, outp.i2c_index)); |
| 377 | oclass = nouveau_i2c_extdev_sclass[j]; |
| 378 | do { |
| 379 | if (oclass->handle != info.type) |
| 380 | continue; |
| 381 | ret = nouveau_object_ctor(parent, *pobject, |
| 382 | oclass, NULL, |
| 383 | index++, &object); |
| 384 | } while (ret && (++oclass)->handle); |
| 385 | } |
| 386 | } |
| 387 | |
| 388 | return 0; |
| 389 | } |
| 390 | |