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