1 /* 2 * Copyright 2015 Red Hat Inc. 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a 5 * copy of this software and associated documentation files (the "Software"), 6 * to deal in the Software without restriction, including without limitation 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8 * and/or sell copies of the Software, and to permit persons to whom the 9 * Software is furnished to do so, subject to the following conditions: 10 * 11 * The above copyright notice and this permission notice shall be included in 12 * all copies or substantial busions of the Software. 13 * 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR 18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 20 * OTHER DEALINGS IN THE SOFTWARE. 21 * 22 * Authors: Ben Skeggs <bskeggs@redhat.com> 23 */ 24 #define nv04_i2c_bus(p) container_of((p), struct nv04_i2c_bus, base) 25 #include "bus.h" 26 27 #include <subdev/vga.h> 28 29 struct nv04_i2c_bus { 30 struct nvkm_i2c_bus base; 31 u8 drive; 32 u8 sense; 33 }; 34 35 static void 36 nv04_i2c_bus_drive_scl(struct nvkm_i2c_bus *base, int state) 37 { 38 struct nv04_i2c_bus *bus = nv04_i2c_bus(base); 39 struct nvkm_device *device = bus->base.pad->i2c->subdev.device; 40 u8 val = nvkm_rdvgac(device, 0, bus->drive); 41 if (state) val |= 0x20; 42 else val &= 0xdf; 43 nvkm_wrvgac(device, 0, bus->drive, val | 0x01); 44 } 45 46 static void 47 nv04_i2c_bus_drive_sda(struct nvkm_i2c_bus *base, int state) 48 { 49 struct nv04_i2c_bus *bus = nv04_i2c_bus(base); 50 struct nvkm_device *device = bus->base.pad->i2c->subdev.device; 51 u8 val = nvkm_rdvgac(device, 0, bus->drive); 52 if (state) val |= 0x10; 53 else val &= 0xef; 54 nvkm_wrvgac(device, 0, bus->drive, val | 0x01); 55 } 56 57 static int 58 nv04_i2c_bus_sense_scl(struct nvkm_i2c_bus *base) 59 { 60 struct nv04_i2c_bus *bus = nv04_i2c_bus(base); 61 struct nvkm_device *device = bus->base.pad->i2c->subdev.device; 62 return !!(nvkm_rdvgac(device, 0, bus->sense) & 0x04); 63 } 64 65 static int 66 nv04_i2c_bus_sense_sda(struct nvkm_i2c_bus *base) 67 { 68 struct nv04_i2c_bus *bus = nv04_i2c_bus(base); 69 struct nvkm_device *device = bus->base.pad->i2c->subdev.device; 70 return !!(nvkm_rdvgac(device, 0, bus->sense) & 0x08); 71 } 72 73 static const struct nvkm_i2c_bus_func 74 nv04_i2c_bus_func = { 75 .drive_scl = nv04_i2c_bus_drive_scl, 76 .drive_sda = nv04_i2c_bus_drive_sda, 77 .sense_scl = nv04_i2c_bus_sense_scl, 78 .sense_sda = nv04_i2c_bus_sense_sda, 79 .xfer = nvkm_i2c_bit_xfer, 80 }; 81 82 int 83 nv04_i2c_bus_new(struct nvkm_i2c_pad *pad, int id, u8 drive, u8 sense, 84 struct nvkm_i2c_bus **pbus) 85 { 86 struct nv04_i2c_bus *bus; 87 88 if (!(bus = kzalloc(sizeof(*bus), GFP_KERNEL))) 89 return -ENOMEM; 90 *pbus = &bus->base; 91 92 nvkm_i2c_bus_ctor(&nv04_i2c_bus_func, pad, id, &bus->base); 93 bus->drive = drive; 94 bus->sense = sense; 95 return 0; 96 } 97