text: /*
   * 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 nv4e_i2c_bus(p) container_of((p), struct nv4e_i2c_bus, base)
  #include "bus.h"
  
  struct nv4e_i2c_bus {
  	struct nvkm_i2c_bus base;
  	u32 addr;
  };
  
  static void
  nv4e_i2c_bus_drive_scl(struct nvkm_i2c_bus *base, int state)
  {
  	struct nv4e_i2c_bus *bus = nv4e_i2c_bus(base);
  	struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
  	nvkm_mask(device, bus->addr, 0x2f, state ? 0x21 : 0x01);
  }
  
  static void
  nv4e_i2c_bus_drive_sda(struct nvkm_i2c_bus *base, int state)
  {
  	struct nv4e_i2c_bus *bus = nv4e_i2c_bus(base);
  	struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
  	nvkm_mask(device, bus->addr, 0x1f, state ? 0x11 : 0x01);
  }
  
  static int
  nv4e_i2c_bus_sense_scl(struct nvkm_i2c_bus *base)
  {
  	struct nv4e_i2c_bus *bus = nv4e_i2c_bus(base);
  	struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
  	return !!(nvkm_rd32(device, bus->addr) & 0x00040000);
  }
  
  static int
  nv4e_i2c_bus_sense_sda(struct nvkm_i2c_bus *base)
  {
  	struct nv4e_i2c_bus *bus = nv4e_i2c_bus(base);
  	struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
  	return !!(nvkm_rd32(device, bus->addr) & 0x00080000);
  }
  
  static const struct nvkm_i2c_bus_func
  nv4e_i2c_bus_func = {
  	.drive_scl = nv4e_i2c_bus_drive_scl,
  	.drive_sda = nv4e_i2c_bus_drive_sda,
  	.sense_scl = nv4e_i2c_bus_sense_scl,
  	.sense_sda = nv4e_i2c_bus_sense_sda,
  	.xfer = nvkm_i2c_bit_xfer,
  };
  
  int
  nv4e_i2c_bus_new(struct nvkm_i2c_pad *pad, int id, u8 drive,
  		 struct nvkm_i2c_bus **pbus)
  {
  	struct nv4e_i2c_bus *bus;
  
  	if (!(bus = kzalloc(sizeof(*bus), GFP_KERNEL)))
  		return -ENOMEM;
  	*pbus = &bus->base;
  
  	nvkm_i2c_bus_ctor(&nv4e_i2c_bus_func, pad, id, &bus->base);
  	bus->addr = 0x600800 + drive;
  	return 0;
  }
  