cregit-Linux how code gets into the kernel

Release 4.11 drivers/gpu/drm/nouveau/nvkm/subdev/i2c/busnv04.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 busions 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>
 */

#define nv04_i2c_bus(p) container_of((p), struct nv04_i2c_bus, base)
#include "bus.h"

#include <subdev/vga.h>


struct nv04_i2c_bus {
	
struct nvkm_i2c_bus base;
	
u8 drive;
	
u8 sense;
};


static void nv04_i2c_bus_drive_scl(struct nvkm_i2c_bus *base, int state) { struct nv04_i2c_bus *bus = nv04_i2c_bus(base); struct nvkm_device *device = bus->base.pad->i2c->subdev.device; u8 val = nvkm_rdvgac(device, 0, bus->drive); if (state) val |= 0x20; else val &= 0xdf; nvkm_wrvgac(device, 0, bus->drive, val | 0x01); }

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static void nv04_i2c_bus_drive_sda(struct nvkm_i2c_bus *base, int state) { struct nv04_i2c_bus *bus = nv04_i2c_bus(base); struct nvkm_device *device = bus->base.pad->i2c->subdev.device; u8 val = nvkm_rdvgac(device, 0, bus->drive); if (state) val |= 0x10; else val &= 0xef; nvkm_wrvgac(device, 0, bus->drive, val | 0x01); }

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Ben Skeggs83100.00%1100.00%
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static int nv04_i2c_bus_sense_scl(struct nvkm_i2c_bus *base) { struct nv04_i2c_bus *bus = nv04_i2c_bus(base); struct nvkm_device *device = bus->base.pad->i2c->subdev.device; return !!(nvkm_rdvgac(device, 0, bus->sense) & 0x04); }

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Ben Skeggs56100.00%1100.00%
Total56100.00%1100.00%


static int nv04_i2c_bus_sense_sda(struct nvkm_i2c_bus *base) { struct nv04_i2c_bus *bus = nv04_i2c_bus(base); struct nvkm_device *device = bus->base.pad->i2c->subdev.device; return !!(nvkm_rdvgac(device, 0, bus->sense) & 0x08); }

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static const struct nvkm_i2c_bus_func nv04_i2c_bus_func = { .drive_scl = nv04_i2c_bus_drive_scl, .drive_sda = nv04_i2c_bus_drive_sda, .sense_scl = nv04_i2c_bus_sense_scl, .sense_sda = nv04_i2c_bus_sense_sda, .xfer = nvkm_i2c_bit_xfer, };
int nv04_i2c_bus_new(struct nvkm_i2c_pad *pad, int id, u8 drive, u8 sense, struct nvkm_i2c_bus **pbus) { struct nv04_i2c_bus *bus; if (!(bus = kzalloc(sizeof(*bus), GFP_KERNEL))) return -ENOMEM; *pbus = &bus->base; nvkm_i2c_bus_ctor(&nv04_i2c_bus_func, pad, id, &bus->base); bus->drive = drive; bus->sense = sense; return 0; }

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