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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 | */ | |
2aa5eac5 BS |
24 | #include "aux.h" |
25 | #include "pad.h" | |
4196faa8 BS |
26 | |
27 | static int | |
2aa5eac5 | 28 | nvkm_i2c_aux_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num) |
4196faa8 | 29 | { |
2aa5eac5 | 30 | struct nvkm_i2c_aux *aux = container_of(adap, typeof(*aux), i2c); |
4196faa8 BS |
31 | struct i2c_msg *msg = msgs; |
32 | int ret, mcnt = num; | |
33 | ||
2aa5eac5 | 34 | ret = nvkm_i2c_aux_acquire(aux); |
d2ae2eb4 BS |
35 | if (ret) |
36 | return ret; | |
df3ef6a1 | 37 | |
4196faa8 BS |
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 | ||
2aa5eac5 | 54 | ret = aux->func->xfer(aux, true, cmd, msg->addr, ptr, cnt); |
d2ae2eb4 | 55 | if (ret < 0) { |
2aa5eac5 | 56 | nvkm_i2c_aux_release(aux); |
4196faa8 | 57 | return ret; |
d2ae2eb4 | 58 | } |
4196faa8 BS |
59 | |
60 | ptr += cnt; | |
61 | remaining -= cnt; | |
62 | } | |
63 | ||
64 | msg++; | |
65 | } | |
66 | ||
2aa5eac5 | 67 | nvkm_i2c_aux_release(aux); |
4196faa8 BS |
68 | return num; |
69 | } | |
70 | ||
71 | static u32 | |
2aa5eac5 | 72 | nvkm_i2c_aux_i2c_func(struct i2c_adapter *adap) |
4196faa8 BS |
73 | { |
74 | return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL; | |
75 | } | |
76 | ||
2aa5eac5 BS |
77 | 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 | |
4196faa8 | 81 | }; |
2aa5eac5 BS |
82 | |
83 | void | |
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 | |
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 | |
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 | |
117 | nvkm_i2c_aux_xfer(struct nvkm_i2c_aux *aux, bool retry, u8 type, | |
118 | u32 addr, u8 *data, u8 size) | |
119 | { | |
120 | return aux->func->xfer(aux, retry, type, addr, data, size); | |
121 | } | |
122 | ||
123 | int | |
124 | nvkm_i2c_aux_lnk_ctl(struct nvkm_i2c_aux *aux, int nr, int bw, bool ef) | |
125 | { | |
126 | if (aux->func->lnk_ctl) | |
127 | return aux->func->lnk_ctl(aux, nr, bw, ef); | |
128 | return -ENODEV; | |
129 | } | |
130 | ||
131 | void | |
132 | nvkm_i2c_aux_del(struct nvkm_i2c_aux **paux) | |
133 | { | |
134 | struct nvkm_i2c_aux *aux = *paux; | |
135 | if (aux && !WARN_ON(!aux->func)) { | |
136 | AUX_TRACE(aux, "dtor"); | |
137 | list_del(&aux->head); | |
138 | i2c_del_adapter(&aux->i2c); | |
139 | kfree(*paux); | |
140 | *paux = NULL; | |
141 | } | |
142 | } | |
143 | ||
144 | int | |
145 | nvkm_i2c_aux_ctor(const struct nvkm_i2c_aux_func *func, | |
146 | struct nvkm_i2c_pad *pad, int id, | |
147 | struct nvkm_i2c_aux *aux) | |
148 | { | |
149 | struct nvkm_device *device = pad->i2c->subdev.device; | |
150 | ||
151 | aux->func = func; | |
152 | aux->pad = pad; | |
153 | aux->id = id; | |
154 | mutex_init(&aux->mutex); | |
155 | list_add_tail(&aux->head, &pad->i2c->aux); | |
156 | AUX_TRACE(aux, "ctor"); | |
157 | ||
158 | snprintf(aux->i2c.name, sizeof(aux->i2c.name), "nvkm-%s-aux-%04x", | |
159 | dev_name(device->dev), id); | |
160 | aux->i2c.owner = THIS_MODULE; | |
161 | aux->i2c.dev.parent = device->dev; | |
162 | aux->i2c.algo = &nvkm_i2c_aux_i2c_algo; | |
163 | return i2c_add_adapter(&aux->i2c); | |
164 | } | |
165 | ||
166 | int | |
167 | nvkm_i2c_aux_new_(const struct nvkm_i2c_aux_func *func, | |
168 | struct nvkm_i2c_pad *pad, int id, | |
169 | struct nvkm_i2c_aux **paux) | |
170 | { | |
171 | if (!(*paux = kzalloc(sizeof(**paux), GFP_KERNEL))) | |
172 | return -ENOMEM; | |
173 | return nvkm_i2c_aux_ctor(func, pad, id, *paux); | |
174 | } |