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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/gpu/drm/nouveau/nvkm/subdev/i2c/bus.c | |
parent | Initial commit. (diff) | |
download | linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip |
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/gpu/drm/nouveau/nvkm/subdev/i2c/bus.c')
-rw-r--r-- | drivers/gpu/drm/nouveau/nvkm/subdev/i2c/bus.c | 264 |
1 files changed, 264 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/i2c/bus.c b/drivers/gpu/drm/nouveau/nvkm/subdev/i2c/bus.c new file mode 100644 index 000000000..ed50cc373 --- /dev/null +++ b/drivers/gpu/drm/nouveau/nvkm/subdev/i2c/bus.c @@ -0,0 +1,264 @@ +/* + * 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); + + mutex_lock(&bus->mutex); + bus->enabled = true; + mutex_unlock(&bus->mutex); +} + +void +nvkm_i2c_bus_fini(struct nvkm_i2c_bus *bus) +{ + BUS_TRACE(bus, "fini"); + mutex_lock(&bus->mutex); + bus->enabled = false; + mutex_unlock(&bus->mutex); +} + +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); + + if (bus->enabled) + ret = nvkm_i2c_pad_acquire(pad, NVKM_I2C_PAD_I2C); + else + ret = -EIO; + + 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); +} |