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Release 4.11 drivers/gpu/drm/nouveau/nvkm/subdev/i2c/bus.c

/*
 * 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); }

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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); }

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static void nvkm_i2c_bus_setscl(void *data, int state) { struct nvkm_i2c_bus *bus = data; bus->func->drive_scl(bus, state); }

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static void nvkm_i2c_bus_setsda(void *data, int state) { struct nvkm_i2c_bus *bus = data; bus->func->drive_sda(bus, state); }

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static int nvkm_i2c_bus_getscl(void *data) { struct nvkm_i2c_bus *bus = data; return bus->func->sense_scl(bus); }

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static int nvkm_i2c_bus_getsda(void *data) { struct nvkm_i2c_bus *bus = data; return bus->func->sense_sda(bus); }

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/******************************************************************************* * !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; }

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static u32 nvkm_i2c_bus_func(struct i2c_adapter *adap) { return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL; }

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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); }

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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); }

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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; }

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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; }

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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; } }

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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; }

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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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