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 "aux.h"
25 #include "pad.h"
26
27 static int
nvkm_i2c_aux_i2c_xfer(struct i2c_adapter * adap,struct i2c_msg * msgs,int num)28 nvkm_i2c_aux_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
29 {
30 struct nvkm_i2c_aux *aux = container_of(adap, typeof(*aux), i2c);
31 struct i2c_msg *msg = msgs;
32 int ret, mcnt = num;
33
34 ret = nvkm_i2c_aux_acquire(aux);
35 if (ret)
36 return ret;
37
38 while (mcnt--) {
39 u8 remaining = msg->len;
40 u8 *ptr = msg->buf;
41
42 while (remaining) {
43 u8 cnt = (remaining > 16) ? 16 : remaining;
44 u8 cmd;
45
46 if (msg->flags & I2C_M_RD)
47 cmd = 1;
48 else
49 cmd = 0;
50
51 if (mcnt || remaining > 16)
52 cmd |= 4; /* MOT */
53
54 ret = aux->func->xfer(aux, true, cmd, msg->addr, ptr, &cnt);
55 if (ret < 0) {
56 nvkm_i2c_aux_release(aux);
57 return ret;
58 }
59
60 ptr += cnt;
61 remaining -= cnt;
62 }
63
64 msg++;
65 }
66
67 nvkm_i2c_aux_release(aux);
68 return num;
69 }
70
71 static u32
nvkm_i2c_aux_i2c_func(struct i2c_adapter * adap)72 nvkm_i2c_aux_i2c_func(struct i2c_adapter *adap)
73 {
74 return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
75 }
76
77 static const struct i2c_algorithm
78 nvkm_i2c_aux_i2c_algo = {
79 .master_xfer = nvkm_i2c_aux_i2c_xfer,
80 .functionality = nvkm_i2c_aux_i2c_func
81 };
82
83 void
nvkm_i2c_aux_monitor(struct nvkm_i2c_aux * aux,bool monitor)84 nvkm_i2c_aux_monitor(struct nvkm_i2c_aux *aux, bool monitor)
85 {
86 struct nvkm_i2c_pad *pad = aux->pad;
87 AUX_TRACE(aux, "monitor: %s", monitor ? "yes" : "no");
88 if (monitor)
89 nvkm_i2c_pad_mode(pad, NVKM_I2C_PAD_AUX);
90 else
91 nvkm_i2c_pad_mode(pad, NVKM_I2C_PAD_OFF);
92 }
93
94 void
nvkm_i2c_aux_release(struct nvkm_i2c_aux * aux)95 nvkm_i2c_aux_release(struct nvkm_i2c_aux *aux)
96 {
97 struct nvkm_i2c_pad *pad = aux->pad;
98 AUX_TRACE(aux, "release");
99 nvkm_i2c_pad_release(pad);
100 mutex_unlock(&aux->mutex);
101 }
102
103 int
nvkm_i2c_aux_acquire(struct nvkm_i2c_aux * aux)104 nvkm_i2c_aux_acquire(struct nvkm_i2c_aux *aux)
105 {
106 struct nvkm_i2c_pad *pad = aux->pad;
107 int ret;
108 AUX_TRACE(aux, "acquire");
109 mutex_lock(&aux->mutex);
110 ret = nvkm_i2c_pad_acquire(pad, NVKM_I2C_PAD_AUX);
111 if (ret)
112 mutex_unlock(&aux->mutex);
113 return ret;
114 }
115
116 int
nvkm_i2c_aux_xfer(struct nvkm_i2c_aux * aux,bool retry,u8 type,u32 addr,u8 * data,u8 * size)117 nvkm_i2c_aux_xfer(struct nvkm_i2c_aux *aux, bool retry, u8 type,
118 u32 addr, u8 *data, u8 *size)
119 {
120 if (!*size && !aux->func->address_only) {
121 AUX_ERR(aux, "address-only transaction dropped");
122 return -ENOSYS;
123 }
124 return aux->func->xfer(aux, retry, type, addr, data, size);
125 }
126
127 int
nvkm_i2c_aux_lnk_ctl(struct nvkm_i2c_aux * aux,int nr,int bw,bool ef)128 nvkm_i2c_aux_lnk_ctl(struct nvkm_i2c_aux *aux, int nr, int bw, bool ef)
129 {
130 if (aux->func->lnk_ctl)
131 return aux->func->lnk_ctl(aux, nr, bw, ef);
132 return -ENODEV;
133 }
134
135 void
nvkm_i2c_aux_del(struct nvkm_i2c_aux ** paux)136 nvkm_i2c_aux_del(struct nvkm_i2c_aux **paux)
137 {
138 struct nvkm_i2c_aux *aux = *paux;
139 if (aux && !WARN_ON(!aux->func)) {
140 AUX_TRACE(aux, "dtor");
141 list_del(&aux->head);
142 i2c_del_adapter(&aux->i2c);
143 kfree(*paux);
144 *paux = NULL;
145 }
146 }
147
148 int
nvkm_i2c_aux_ctor(const struct nvkm_i2c_aux_func * func,struct nvkm_i2c_pad * pad,int id,struct nvkm_i2c_aux * aux)149 nvkm_i2c_aux_ctor(const struct nvkm_i2c_aux_func *func,
150 struct nvkm_i2c_pad *pad, int id,
151 struct nvkm_i2c_aux *aux)
152 {
153 struct nvkm_device *device = pad->i2c->subdev.device;
154
155 aux->func = func;
156 aux->pad = pad;
157 aux->id = id;
158 mutex_init(&aux->mutex);
159 list_add_tail(&aux->head, &pad->i2c->aux);
160 AUX_TRACE(aux, "ctor");
161
162 snprintf(aux->i2c.name, sizeof(aux->i2c.name), "nvkm-%s-aux-%04x",
163 dev_name(device->dev), id);
164 aux->i2c.owner = THIS_MODULE;
165 aux->i2c.dev.parent = device->dev;
166 aux->i2c.algo = &nvkm_i2c_aux_i2c_algo;
167 return i2c_add_adapter(&aux->i2c);
168 }
169
170 int
nvkm_i2c_aux_new_(const struct nvkm_i2c_aux_func * func,struct nvkm_i2c_pad * pad,int id,struct nvkm_i2c_aux ** paux)171 nvkm_i2c_aux_new_(const struct nvkm_i2c_aux_func *func,
172 struct nvkm_i2c_pad *pad, int id,
173 struct nvkm_i2c_aux **paux)
174 {
175 if (!(*paux = kzalloc(sizeof(**paux), GFP_KERNEL)))
176 return -ENOMEM;
177 return nvkm_i2c_aux_ctor(func, pad, id, *paux);
178 }
179
