1c39f472eSBen Skeggs /*
22aa5eac5SBen Skeggs * Copyright 2015 Red Hat Inc.
3c39f472eSBen Skeggs *
4c39f472eSBen Skeggs * Permission is hereby granted, free of charge, to any person obtaining a
5c39f472eSBen Skeggs * copy of this software and associated documentation files (the "Software"),
6c39f472eSBen Skeggs * to deal in the Software without restriction, including without limitation
7c39f472eSBen Skeggs * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8c39f472eSBen Skeggs * and/or sell copies of the Software, and to permit persons to whom the
9c39f472eSBen Skeggs * Software is furnished to do so, subject to the following conditions:
10c39f472eSBen Skeggs *
11c39f472eSBen Skeggs * The above copyright notice and this permission notice shall be included in
12c39f472eSBen Skeggs * all copies or substantial portions of the Software.
13c39f472eSBen Skeggs *
14c39f472eSBen Skeggs * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15c39f472eSBen Skeggs * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16c39f472eSBen Skeggs * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
17c39f472eSBen Skeggs * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
18c39f472eSBen Skeggs * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19c39f472eSBen Skeggs * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20c39f472eSBen Skeggs * OTHER DEALINGS IN THE SOFTWARE.
21c39f472eSBen Skeggs *
222aa5eac5SBen Skeggs * Authors: Ben Skeggs <bskeggs@redhat.com>
23c39f472eSBen Skeggs */
24c39f472eSBen Skeggs #include "pad.h"
25c39f472eSBen Skeggs
262aa5eac5SBen Skeggs static void
nvkm_i2c_pad_mode_locked(struct nvkm_i2c_pad * pad,enum nvkm_i2c_pad_mode mode)272aa5eac5SBen Skeggs nvkm_i2c_pad_mode_locked(struct nvkm_i2c_pad *pad, enum nvkm_i2c_pad_mode mode)
28c39f472eSBen Skeggs {
292aa5eac5SBen Skeggs PAD_TRACE(pad, "-> %s", (mode == NVKM_I2C_PAD_AUX) ? "aux" :
302aa5eac5SBen Skeggs (mode == NVKM_I2C_PAD_I2C) ? "i2c" : "off");
312aa5eac5SBen Skeggs if (pad->func->mode)
322aa5eac5SBen Skeggs pad->func->mode(pad, mode);
332aa5eac5SBen Skeggs }
342aa5eac5SBen Skeggs
352aa5eac5SBen Skeggs void
nvkm_i2c_pad_mode(struct nvkm_i2c_pad * pad,enum nvkm_i2c_pad_mode mode)362aa5eac5SBen Skeggs nvkm_i2c_pad_mode(struct nvkm_i2c_pad *pad, enum nvkm_i2c_pad_mode mode)
372aa5eac5SBen Skeggs {
382aa5eac5SBen Skeggs PAD_TRACE(pad, "mode %d", mode);
392aa5eac5SBen Skeggs mutex_lock(&pad->mutex);
402aa5eac5SBen Skeggs nvkm_i2c_pad_mode_locked(pad, mode);
412aa5eac5SBen Skeggs pad->mode = mode;
422aa5eac5SBen Skeggs mutex_unlock(&pad->mutex);
432aa5eac5SBen Skeggs }
442aa5eac5SBen Skeggs
452aa5eac5SBen Skeggs void
nvkm_i2c_pad_release(struct nvkm_i2c_pad * pad)462aa5eac5SBen Skeggs nvkm_i2c_pad_release(struct nvkm_i2c_pad *pad)
472aa5eac5SBen Skeggs {
482aa5eac5SBen Skeggs PAD_TRACE(pad, "release");
492aa5eac5SBen Skeggs if (pad->mode == NVKM_I2C_PAD_OFF)
502aa5eac5SBen Skeggs nvkm_i2c_pad_mode_locked(pad, pad->mode);
512aa5eac5SBen Skeggs mutex_unlock(&pad->mutex);
52c39f472eSBen Skeggs }
53c39f472eSBen Skeggs
54c39f472eSBen Skeggs int
nvkm_i2c_pad_acquire(struct nvkm_i2c_pad * pad,enum nvkm_i2c_pad_mode mode)552aa5eac5SBen Skeggs nvkm_i2c_pad_acquire(struct nvkm_i2c_pad *pad, enum nvkm_i2c_pad_mode mode)
56c39f472eSBen Skeggs {
572aa5eac5SBen Skeggs PAD_TRACE(pad, "acquire");
582aa5eac5SBen Skeggs mutex_lock(&pad->mutex);
592aa5eac5SBen Skeggs if (pad->mode != mode) {
602aa5eac5SBen Skeggs if (pad->mode != NVKM_I2C_PAD_OFF) {
612aa5eac5SBen Skeggs mutex_unlock(&pad->mutex);
622aa5eac5SBen Skeggs return -EBUSY;
63c39f472eSBen Skeggs }
642aa5eac5SBen Skeggs nvkm_i2c_pad_mode_locked(pad, mode);
65c39f472eSBen Skeggs }
66c39f472eSBen Skeggs return 0;
67c39f472eSBen Skeggs }
68c39f472eSBen Skeggs
692aa5eac5SBen Skeggs void
nvkm_i2c_pad_fini(struct nvkm_i2c_pad * pad)702aa5eac5SBen Skeggs nvkm_i2c_pad_fini(struct nvkm_i2c_pad *pad)
71c39f472eSBen Skeggs {
722aa5eac5SBen Skeggs PAD_TRACE(pad, "fini");
732aa5eac5SBen Skeggs nvkm_i2c_pad_mode_locked(pad, NVKM_I2C_PAD_OFF);
742aa5eac5SBen Skeggs }
752aa5eac5SBen Skeggs
762aa5eac5SBen Skeggs void
nvkm_i2c_pad_init(struct nvkm_i2c_pad * pad)772aa5eac5SBen Skeggs nvkm_i2c_pad_init(struct nvkm_i2c_pad *pad)
782aa5eac5SBen Skeggs {
792aa5eac5SBen Skeggs PAD_TRACE(pad, "init");
802aa5eac5SBen Skeggs nvkm_i2c_pad_mode_locked(pad, pad->mode);
812aa5eac5SBen Skeggs }
822aa5eac5SBen Skeggs
832aa5eac5SBen Skeggs void
nvkm_i2c_pad_del(struct nvkm_i2c_pad ** ppad)842aa5eac5SBen Skeggs nvkm_i2c_pad_del(struct nvkm_i2c_pad **ppad)
852aa5eac5SBen Skeggs {
862aa5eac5SBen Skeggs struct nvkm_i2c_pad *pad = *ppad;
872aa5eac5SBen Skeggs if (pad) {
882aa5eac5SBen Skeggs PAD_TRACE(pad, "dtor");
892aa5eac5SBen Skeggs list_del(&pad->head);
902aa5eac5SBen Skeggs kfree(pad);
912aa5eac5SBen Skeggs pad = NULL;
922aa5eac5SBen Skeggs }
932aa5eac5SBen Skeggs }
942aa5eac5SBen Skeggs
952aa5eac5SBen Skeggs void
nvkm_i2c_pad_ctor(const struct nvkm_i2c_pad_func * func,struct nvkm_i2c * i2c,int id,struct nvkm_i2c_pad * pad)962aa5eac5SBen Skeggs nvkm_i2c_pad_ctor(const struct nvkm_i2c_pad_func *func, struct nvkm_i2c *i2c,
972aa5eac5SBen Skeggs int id, struct nvkm_i2c_pad *pad)
982aa5eac5SBen Skeggs {
992aa5eac5SBen Skeggs pad->func = func;
1002aa5eac5SBen Skeggs pad->i2c = i2c;
1012aa5eac5SBen Skeggs pad->id = id;
1022aa5eac5SBen Skeggs pad->mode = NVKM_I2C_PAD_OFF;
1032aa5eac5SBen Skeggs mutex_init(&pad->mutex);
1042aa5eac5SBen Skeggs list_add_tail(&pad->head, &i2c->pad);
1052aa5eac5SBen Skeggs PAD_TRACE(pad, "ctor");
1062aa5eac5SBen Skeggs }
1072aa5eac5SBen Skeggs
1082aa5eac5SBen Skeggs int
nvkm_i2c_pad_new_(const struct nvkm_i2c_pad_func * func,struct nvkm_i2c * i2c,int id,struct nvkm_i2c_pad ** ppad)1092aa5eac5SBen Skeggs nvkm_i2c_pad_new_(const struct nvkm_i2c_pad_func *func, struct nvkm_i2c *i2c,
1102aa5eac5SBen Skeggs int id, struct nvkm_i2c_pad **ppad)
1112aa5eac5SBen Skeggs {
1122aa5eac5SBen Skeggs if (!(*ppad = kzalloc(sizeof(**ppad), GFP_KERNEL)))
1132aa5eac5SBen Skeggs return -ENOMEM;
1142aa5eac5SBen Skeggs nvkm_i2c_pad_ctor(func, i2c, id, *ppad);
1152aa5eac5SBen Skeggs return 0;
116c39f472eSBen Skeggs }
117