diff options
Diffstat (limited to 'drivers/gpu/drm/nouveau/nvkm/subdev/i2c/pad.c')
| -rw-r--r-- | drivers/gpu/drm/nouveau/nvkm/subdev/i2c/pad.c | 116 |
1 files changed, 116 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/i2c/pad.c b/drivers/gpu/drm/nouveau/nvkm/subdev/i2c/pad.c new file mode 100644 index 000000000..2c5fcb9c5 --- /dev/null +++ b/drivers/gpu/drm/nouveau/nvkm/subdev/i2c/pad.c @@ -0,0 +1,116 @@ +/* + * Copyright 2015 Red Hat Inc. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR + * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, + * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR + * OTHER DEALINGS IN THE SOFTWARE. + * + * Authors: Ben Skeggs <bskeggs@redhat.com> + */ +#include "pad.h" + +static void +nvkm_i2c_pad_mode_locked(struct nvkm_i2c_pad *pad, enum nvkm_i2c_pad_mode mode) +{ + PAD_TRACE(pad, "-> %s", (mode == NVKM_I2C_PAD_AUX) ? "aux" : + (mode == NVKM_I2C_PAD_I2C) ? "i2c" : "off"); + if (pad->func->mode) + pad->func->mode(pad, mode); +} + +void +nvkm_i2c_pad_mode(struct nvkm_i2c_pad *pad, enum nvkm_i2c_pad_mode mode) +{ + PAD_TRACE(pad, "mode %d", mode); + mutex_lock(&pad->mutex); + nvkm_i2c_pad_mode_locked(pad, mode); + pad->mode = mode; + mutex_unlock(&pad->mutex); +} + +void +nvkm_i2c_pad_release(struct nvkm_i2c_pad *pad) +{ + PAD_TRACE(pad, "release"); + if (pad->mode == NVKM_I2C_PAD_OFF) + nvkm_i2c_pad_mode_locked(pad, pad->mode); + mutex_unlock(&pad->mutex); +} + +int +nvkm_i2c_pad_acquire(struct nvkm_i2c_pad *pad, enum nvkm_i2c_pad_mode mode) +{ + PAD_TRACE(pad, "acquire"); + mutex_lock(&pad->mutex); + if (pad->mode != mode) { + if (pad->mode != NVKM_I2C_PAD_OFF) { + mutex_unlock(&pad->mutex); + return -EBUSY; + } + nvkm_i2c_pad_mode_locked(pad, mode); + } + return 0; +} + +void +nvkm_i2c_pad_fini(struct nvkm_i2c_pad *pad) +{ + PAD_TRACE(pad, "fini"); + nvkm_i2c_pad_mode_locked(pad, NVKM_I2C_PAD_OFF); +} + +void +nvkm_i2c_pad_init(struct nvkm_i2c_pad *pad) +{ + PAD_TRACE(pad, "init"); + nvkm_i2c_pad_mode_locked(pad, pad->mode); +} + +void +nvkm_i2c_pad_del(struct nvkm_i2c_pad **ppad) +{ + struct nvkm_i2c_pad *pad = *ppad; + if (pad) { + PAD_TRACE(pad, "dtor"); + list_del(&pad->head); + kfree(pad); + pad = NULL; + } +} + +void +nvkm_i2c_pad_ctor(const struct nvkm_i2c_pad_func *func, struct nvkm_i2c *i2c, + int id, struct nvkm_i2c_pad *pad) +{ + pad->func = func; + pad->i2c = i2c; + pad->id = id; + pad->mode = NVKM_I2C_PAD_OFF; + mutex_init(&pad->mutex); + list_add_tail(&pad->head, &i2c->pad); + PAD_TRACE(pad, "ctor"); +} + +int +nvkm_i2c_pad_new_(const struct nvkm_i2c_pad_func *func, struct nvkm_i2c *i2c, + int id, struct nvkm_i2c_pad **ppad) +{ + if (!(*ppad = kzalloc(sizeof(**ppad), GFP_KERNEL))) + return -ENOMEM; + nvkm_i2c_pad_ctor(func, i2c, id, *ppad); + return 0; +} |