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* 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 "priv.h"
int
nv_rdaux(struct nouveau_i2c_port *port, u32 addr, u8 *data, u8 size)
{
struct nouveau_i2c *i2c = nouveau_i2c(port);
if (port->func->aux) {
int ret = i2c->acquire(port, 0);
if (ret == 0) {
ret = port->func->aux(port, true, 9, addr, data, size);
i2c->release(port);
}
return ret;
}
return -ENODEV;
}
int
nv_wraux(struct nouveau_i2c_port *port, u32 addr, u8 *data, u8 size)
{
struct nouveau_i2c *i2c = nouveau_i2c(port);
if (port->func->aux) {
int ret = i2c->acquire(port, 0);
if (ret == 0) {
ret = port->func->aux(port, true, 8, addr, data, size);
i2c->release(port);
}
return ret;
}
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 nouveau_i2c *i2c = nouveau_i2c(port);
struct i2c_msg *msg = msgs;
int ret, mcnt = num;
if (!port->func->aux)
return -ENODEV;
ret = i2c->acquire(port, 0);
if (ret)
return ret;
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, true, cmd, msg->addr, ptr, cnt);
if (ret < 0) {
i2c->release(port);
return ret;
}
ptr += cnt;
remaining -= cnt;
}
msg++;
}
i2c->release(port);
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
};
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