| /* |
| * Copyright 2009 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 |
| */ |
| |
| #include <subdev/i2c.h> |
| |
| int |
| nv_rdaux(struct nouveau_i2c_port *port, u32 addr, u8 *data, u8 size) |
| { |
| if (port->func->aux) { |
| if (port->func->acquire) |
| port->func->acquire(port); |
| return port->func->aux(port, 9, addr, data, size); |
| } |
| return -ENODEV; |
| } |
| |
| int |
| nv_wraux(struct nouveau_i2c_port *port, u32 addr, u8 *data, u8 size) |
| { |
| if (port->func->aux) { |
| if (port->func->acquire) |
| port->func->acquire(port); |
| return port->func->aux(port, 8, addr, data, size); |
| } |
| return -ENODEV; |
| } |
| |
| static int |
| aux_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num) |
| { |
| struct nouveau_i2c_port *port = adap->algo_data; |
| struct i2c_msg *msg = msgs; |
| int ret, mcnt = num; |
| |
| if (!port->func->aux) |
| return -ENODEV; |
| if ( port->func->acquire) |
| port->func->acquire(port); |
| |
| while (mcnt--) { |
| u8 remaining = msg->len; |
| u8 *ptr = msg->buf; |
| |
| while (remaining) { |
| u8 cnt = (remaining > 16) ? 16 : remaining; |
| u8 cmd; |
| |
| if (msg->flags & I2C_M_RD) |
| cmd = 1; |
| else |
| cmd = 0; |
| |
| if (mcnt || remaining > 16) |
| cmd |= 4; /* MOT */ |
| |
| ret = port->func->aux(port, cmd, msg->addr, ptr, cnt); |
| if (ret < 0) |
| return ret; |
| |
| ptr += cnt; |
| remaining -= cnt; |
| } |
| |
| msg++; |
| } |
| |
| return num; |
| } |
| |
| static u32 |
| aux_func(struct i2c_adapter *adap) |
| { |
| return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL; |
| } |
| |
| const struct i2c_algorithm nouveau_i2c_aux_algo = { |
| .master_xfer = aux_xfer, |
| .functionality = aux_func |
| }; |