265 lines
6.6 KiB
C
265 lines
6.6 KiB
C
/*
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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 "bus.h"
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#include "pad.h"
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#include <core/option.h>
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/*******************************************************************************
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* i2c-algo-bit
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******************************************************************************/
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static int
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nvkm_i2c_bus_pre_xfer(struct i2c_adapter *adap)
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{
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struct nvkm_i2c_bus *bus = container_of(adap, typeof(*bus), i2c);
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return nvkm_i2c_bus_acquire(bus);
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}
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static void
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nvkm_i2c_bus_post_xfer(struct i2c_adapter *adap)
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{
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struct nvkm_i2c_bus *bus = container_of(adap, typeof(*bus), i2c);
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return nvkm_i2c_bus_release(bus);
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}
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static void
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nvkm_i2c_bus_setscl(void *data, int state)
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{
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struct nvkm_i2c_bus *bus = data;
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bus->func->drive_scl(bus, state);
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}
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static void
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nvkm_i2c_bus_setsda(void *data, int state)
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{
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struct nvkm_i2c_bus *bus = data;
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bus->func->drive_sda(bus, state);
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}
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static int
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nvkm_i2c_bus_getscl(void *data)
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{
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struct nvkm_i2c_bus *bus = data;
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return bus->func->sense_scl(bus);
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}
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static int
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nvkm_i2c_bus_getsda(void *data)
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{
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struct nvkm_i2c_bus *bus = data;
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return bus->func->sense_sda(bus);
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}
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/*******************************************************************************
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* !i2c-algo-bit (off-chip i2c bus / hw i2c / internal bit-banging algo)
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******************************************************************************/
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static int
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nvkm_i2c_bus_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
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{
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struct nvkm_i2c_bus *bus = container_of(adap, typeof(*bus), i2c);
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int ret;
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ret = nvkm_i2c_bus_acquire(bus);
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if (ret)
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return ret;
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ret = bus->func->xfer(bus, msgs, num);
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nvkm_i2c_bus_release(bus);
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return ret;
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}
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static u32
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nvkm_i2c_bus_func(struct i2c_adapter *adap)
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{
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return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
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}
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static const struct i2c_algorithm
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nvkm_i2c_bus_algo = {
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.master_xfer = nvkm_i2c_bus_xfer,
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.functionality = nvkm_i2c_bus_func,
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};
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/*******************************************************************************
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* nvkm_i2c_bus base
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******************************************************************************/
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void
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nvkm_i2c_bus_init(struct nvkm_i2c_bus *bus)
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{
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BUS_TRACE(bus, "init");
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if (bus->func->init)
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bus->func->init(bus);
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mutex_lock(&bus->mutex);
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bus->enabled = true;
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mutex_unlock(&bus->mutex);
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}
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void
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nvkm_i2c_bus_fini(struct nvkm_i2c_bus *bus)
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{
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BUS_TRACE(bus, "fini");
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mutex_lock(&bus->mutex);
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bus->enabled = false;
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mutex_unlock(&bus->mutex);
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}
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void
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nvkm_i2c_bus_release(struct nvkm_i2c_bus *bus)
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{
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struct nvkm_i2c_pad *pad = bus->pad;
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BUS_TRACE(bus, "release");
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nvkm_i2c_pad_release(pad);
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mutex_unlock(&bus->mutex);
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}
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int
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nvkm_i2c_bus_acquire(struct nvkm_i2c_bus *bus)
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{
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struct nvkm_i2c_pad *pad = bus->pad;
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int ret;
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BUS_TRACE(bus, "acquire");
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mutex_lock(&bus->mutex);
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if (bus->enabled)
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ret = nvkm_i2c_pad_acquire(pad, NVKM_I2C_PAD_I2C);
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else
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ret = -EIO;
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if (ret)
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mutex_unlock(&bus->mutex);
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return ret;
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}
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int
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nvkm_i2c_bus_probe(struct nvkm_i2c_bus *bus, const char *what,
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struct nvkm_i2c_bus_probe *info,
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bool (*match)(struct nvkm_i2c_bus *,
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struct i2c_board_info *, void *), void *data)
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{
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int i;
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BUS_DBG(bus, "probing %ss", what);
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for (i = 0; info[i].dev.addr; i++) {
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u8 orig_udelay = 0;
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if ((bus->i2c.algo == &i2c_bit_algo) && (info[i].udelay != 0)) {
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struct i2c_algo_bit_data *algo = bus->i2c.algo_data;
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BUS_DBG(bus, "%dms delay instead of %dms",
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info[i].udelay, algo->udelay);
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orig_udelay = algo->udelay;
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algo->udelay = info[i].udelay;
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}
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if (nvkm_probe_i2c(&bus->i2c, info[i].dev.addr) &&
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(!match || match(bus, &info[i].dev, data))) {
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BUS_DBG(bus, "detected %s: %s",
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what, info[i].dev.type);
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return i;
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}
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if (orig_udelay) {
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struct i2c_algo_bit_data *algo = bus->i2c.algo_data;
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algo->udelay = orig_udelay;
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}
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}
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BUS_DBG(bus, "no devices found.");
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return -ENODEV;
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}
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void
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nvkm_i2c_bus_del(struct nvkm_i2c_bus **pbus)
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{
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struct nvkm_i2c_bus *bus = *pbus;
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if (bus && !WARN_ON(!bus->func)) {
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BUS_TRACE(bus, "dtor");
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list_del(&bus->head);
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i2c_del_adapter(&bus->i2c);
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kfree(bus->i2c.algo_data);
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kfree(*pbus);
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*pbus = NULL;
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}
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}
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int
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nvkm_i2c_bus_ctor(const struct nvkm_i2c_bus_func *func,
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struct nvkm_i2c_pad *pad, int id,
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struct nvkm_i2c_bus *bus)
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{
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struct nvkm_device *device = pad->i2c->subdev.device;
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struct i2c_algo_bit_data *bit;
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#ifndef CONFIG_NOUVEAU_I2C_INTERNAL_DEFAULT
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const bool internal = false;
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#else
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const bool internal = true;
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#endif
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int ret;
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bus->func = func;
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bus->pad = pad;
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bus->id = id;
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mutex_init(&bus->mutex);
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list_add_tail(&bus->head, &pad->i2c->bus);
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BUS_TRACE(bus, "ctor");
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snprintf(bus->i2c.name, sizeof(bus->i2c.name), "nvkm-%s-bus-%04x",
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dev_name(device->dev), id);
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bus->i2c.owner = THIS_MODULE;
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bus->i2c.dev.parent = device->dev;
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if ( bus->func->drive_scl &&
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!nvkm_boolopt(device->cfgopt, "NvI2C", internal)) {
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if (!(bit = kzalloc(sizeof(*bit), GFP_KERNEL)))
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return -ENOMEM;
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bit->udelay = 10;
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bit->timeout = usecs_to_jiffies(2200);
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bit->data = bus;
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bit->pre_xfer = nvkm_i2c_bus_pre_xfer;
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bit->post_xfer = nvkm_i2c_bus_post_xfer;
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bit->setscl = nvkm_i2c_bus_setscl;
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bit->setsda = nvkm_i2c_bus_setsda;
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bit->getscl = nvkm_i2c_bus_getscl;
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bit->getsda = nvkm_i2c_bus_getsda;
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bus->i2c.algo_data = bit;
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ret = i2c_bit_add_bus(&bus->i2c);
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} else {
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bus->i2c.algo = &nvkm_i2c_bus_algo;
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ret = i2c_add_adapter(&bus->i2c);
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}
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return ret;
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}
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int
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nvkm_i2c_bus_new_(const struct nvkm_i2c_bus_func *func,
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struct nvkm_i2c_pad *pad, int id,
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struct nvkm_i2c_bus **pbus)
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{
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if (!(*pbus = kzalloc(sizeof(**pbus), GFP_KERNEL)))
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return -ENOMEM;
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return nvkm_i2c_bus_ctor(func, pad, id, *pbus);
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}
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