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#include "priv.h"
25
26int
27nv_rdaux(struct nvkm_i2c_port *port, u32 addr, u8 *data, u8 size)
28{
29	struct nvkm_i2c *i2c = nvkm_i2c(port);
30	if (port->func->aux) {
31		int ret = i2c->acquire(port, 0);
32		if (ret == 0) {
33			ret = port->func->aux(port, true, 9, addr, data, size);
34			i2c->release(port);
35		}
36		return ret;
37	}
38	return -ENODEV;
39}
40
41int
42nv_wraux(struct nvkm_i2c_port *port, u32 addr, u8 *data, u8 size)
43{
44	struct nvkm_i2c *i2c = nvkm_i2c(port);
45	if (port->func->aux) {
46		int ret = i2c->acquire(port, 0);
47		if (ret == 0) {
48			ret = port->func->aux(port, true, 8, addr, data, size);
49			i2c->release(port);
50		}
51		return ret;
52	}
53	return -ENODEV;
54}
55
56static int
57aux_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
58{
59	struct nvkm_i2c_port *port = adap->algo_data;
60	struct nvkm_i2c *i2c = nvkm_i2c(port);
61	struct i2c_msg *msg = msgs;
62	int ret, mcnt = num;
63
64	if (!port->func->aux)
65		return -ENODEV;
66
67	ret = i2c->acquire(port, 0);
68	if (ret)
69		return ret;
70
71	while (mcnt--) {
72		u8 remaining = msg->len;
73		u8 *ptr = msg->buf;
74
75		while (remaining) {
76			u8 cnt = (remaining > 16) ? 16 : remaining;
77			u8 cmd;
78
79			if (msg->flags & I2C_M_RD)
80				cmd = 1;
81			else
82				cmd = 0;
83
84			if (mcnt || remaining > 16)
85				cmd |= 4; /* MOT */
86
87			ret = port->func->aux(port, true, cmd, msg->addr, ptr, cnt);
88			if (ret < 0) {
89				i2c->release(port);
90				return ret;
91			}
92
93			ptr += cnt;
94			remaining -= cnt;
95		}
96
97		msg++;
98	}
99
100	i2c->release(port);
101	return num;
102}
103
104static u32
105aux_func(struct i2c_adapter *adap)
106{
107	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
108}
109
110const struct i2c_algorithm nvkm_i2c_aux_algo = {
111	.master_xfer = aux_xfer,
112	.functionality = aux_func
113};
114