1/*
2 * Copyright 2009 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 portions 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
23 */
24
25#include "priv.h"
26
27int
28nv_rdaux(struct nouveau_i2c_port *port, u32 addr, u8 *data, u8 size)
29{
30	struct nouveau_i2c *i2c = nouveau_i2c(port);
31	if (port->func->aux) {
32		int ret = i2c->acquire(port, 0);
33		if (ret == 0) {
34			ret = port->func->aux(port, true, 9, addr, data, size);
35			i2c->release(port);
36		}
37		return ret;
38	}
39	return -ENODEV;
40}
41
42int
43nv_wraux(struct nouveau_i2c_port *port, u32 addr, u8 *data, u8 size)
44{
45	struct nouveau_i2c *i2c = nouveau_i2c(port);
46	if (port->func->aux) {
47		int ret = i2c->acquire(port, 0);
48		if (ret == 0) {
49			ret = port->func->aux(port, true, 8, addr, data, size);
50			i2c->release(port);
51		}
52		return ret;
53	}
54	return -ENODEV;
55}
56
57static int
58aux_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
59{
60	struct nouveau_i2c_port *port = adap->algo_data;
61	struct nouveau_i2c *i2c = nouveau_i2c(port);
62	struct i2c_msg *msg = msgs;
63	int ret, mcnt = num;
64
65	if (!port->func->aux)
66		return -ENODEV;
67
68	ret = i2c->acquire(port, 0);
69	if (ret)
70		return ret;
71
72	while (mcnt--) {
73		u8 remaining = msg->len;
74		u8 *ptr = msg->buf;
75
76		while (remaining) {
77			u8 cnt = (remaining > 16) ? 16 : remaining;
78			u8 cmd;
79
80			if (msg->flags & I2C_M_RD)
81				cmd = 1;
82			else
83				cmd = 0;
84
85			if (mcnt || remaining > 16)
86				cmd |= 4; /* MOT */
87
88			ret = port->func->aux(port, true, cmd, msg->addr, ptr, cnt);
89			if (ret < 0) {
90				i2c->release(port);
91				return ret;
92			}
93
94			ptr += cnt;
95			remaining -= cnt;
96		}
97
98		msg++;
99	}
100
101	i2c->release(port);
102	return num;
103}
104
105static u32
106aux_func(struct i2c_adapter *adap)
107{
108	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
109}
110
111const struct i2c_algorithm nouveau_i2c_aux_algo = {
112	.master_xfer = aux_xfer,
113	.functionality = aux_func
114};
115