117 lines
3.1 KiB
C
117 lines
3.1 KiB
C
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/*
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* Copyright 2015 Red Hat Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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* Authors: Ben Skeggs <bskeggs@redhat.com>
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*/
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#include "pad.h"
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static void
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nvkm_i2c_pad_mode_locked(struct nvkm_i2c_pad *pad, enum nvkm_i2c_pad_mode mode)
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{
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PAD_TRACE(pad, "-> %s", (mode == NVKM_I2C_PAD_AUX) ? "aux" :
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(mode == NVKM_I2C_PAD_I2C) ? "i2c" : "off");
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if (pad->func->mode)
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pad->func->mode(pad, mode);
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}
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void
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nvkm_i2c_pad_mode(struct nvkm_i2c_pad *pad, enum nvkm_i2c_pad_mode mode)
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{
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PAD_TRACE(pad, "mode %d", mode);
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mutex_lock(&pad->mutex);
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nvkm_i2c_pad_mode_locked(pad, mode);
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pad->mode = mode;
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mutex_unlock(&pad->mutex);
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}
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void
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nvkm_i2c_pad_release(struct nvkm_i2c_pad *pad)
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{
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PAD_TRACE(pad, "release");
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if (pad->mode == NVKM_I2C_PAD_OFF)
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nvkm_i2c_pad_mode_locked(pad, pad->mode);
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mutex_unlock(&pad->mutex);
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}
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int
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nvkm_i2c_pad_acquire(struct nvkm_i2c_pad *pad, enum nvkm_i2c_pad_mode mode)
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{
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PAD_TRACE(pad, "acquire");
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mutex_lock(&pad->mutex);
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if (pad->mode != mode) {
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if (pad->mode != NVKM_I2C_PAD_OFF) {
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mutex_unlock(&pad->mutex);
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return -EBUSY;
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}
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nvkm_i2c_pad_mode_locked(pad, mode);
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}
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return 0;
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}
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void
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nvkm_i2c_pad_fini(struct nvkm_i2c_pad *pad)
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{
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PAD_TRACE(pad, "fini");
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nvkm_i2c_pad_mode_locked(pad, NVKM_I2C_PAD_OFF);
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}
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void
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nvkm_i2c_pad_init(struct nvkm_i2c_pad *pad)
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{
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PAD_TRACE(pad, "init");
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nvkm_i2c_pad_mode_locked(pad, pad->mode);
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}
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void
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nvkm_i2c_pad_del(struct nvkm_i2c_pad **ppad)
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{
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struct nvkm_i2c_pad *pad = *ppad;
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if (pad) {
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PAD_TRACE(pad, "dtor");
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list_del(&pad->head);
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kfree(pad);
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pad = NULL;
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}
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}
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void
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nvkm_i2c_pad_ctor(const struct nvkm_i2c_pad_func *func, struct nvkm_i2c *i2c,
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int id, struct nvkm_i2c_pad *pad)
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{
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pad->func = func;
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pad->i2c = i2c;
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pad->id = id;
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pad->mode = NVKM_I2C_PAD_OFF;
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mutex_init(&pad->mutex);
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list_add_tail(&pad->head, &i2c->pad);
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PAD_TRACE(pad, "ctor");
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}
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int
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nvkm_i2c_pad_new_(const struct nvkm_i2c_pad_func *func, struct nvkm_i2c *i2c,
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int id, struct nvkm_i2c_pad **ppad)
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{
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if (!(*ppad = kzalloc(sizeof(**ppad), GFP_KERNEL)))
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return -ENOMEM;
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nvkm_i2c_pad_ctor(func, i2c, id, *ppad);
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return 0;
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}
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