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24#include "aux.h"
25#include "pad.h"
26
27static int
28nvkm_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;
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
71static u32
72nvkm_i2c_aux_i2c_func(struct i2c_adapter *adap)
73{
74 return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
75}
76
77static const struct i2c_algorithm
78nvkm_i2c_aux_i2c_algo = {
79 .master_xfer = nvkm_i2c_aux_i2c_xfer,
80 .functionality = nvkm_i2c_aux_i2c_func
81};
82
83void
84nvkm_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
94void
95nvkm_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
103int
104nvkm_i2c_aux_acquire(struct nvkm_i2c_aux *aux)
105{
106 struct nvkm_i2c_pad *pad = aux->pad;
107 int ret;
108
109 AUX_TRACE(aux, "acquire");
110 mutex_lock(&aux->mutex);
111
112 if (aux->enabled)
113 ret = nvkm_i2c_pad_acquire(pad, NVKM_I2C_PAD_AUX);
114 else
115 ret = -EIO;
116
117 if (ret)
118 mutex_unlock(&aux->mutex);
119 return ret;
120}
121
122int
123nvkm_i2c_aux_xfer(struct nvkm_i2c_aux *aux, bool retry, u8 type,
124 u32 addr, u8 *data, u8 *size)
125{
126 if (!*size && !aux->func->address_only) {
127 AUX_ERR(aux, "address-only transaction dropped");
128 return -ENOSYS;
129 }
130 return aux->func->xfer(aux, retry, type, addr, data, size);
131}
132
133int
134nvkm_i2c_aux_lnk_ctl(struct nvkm_i2c_aux *aux, int nr, int bw, bool ef)
135{
136 if (aux->func->lnk_ctl)
137 return aux->func->lnk_ctl(aux, nr, bw, ef);
138 return -ENODEV;
139}
140
141void
142nvkm_i2c_aux_del(struct nvkm_i2c_aux **paux)
143{
144 struct nvkm_i2c_aux *aux = *paux;
145 if (aux && !WARN_ON(!aux->func)) {
146 AUX_TRACE(aux, "dtor");
147 list_del(&aux->head);
148 i2c_del_adapter(&aux->i2c);
149 kfree(*paux);
150 *paux = NULL;
151 }
152}
153
154void
155nvkm_i2c_aux_init(struct nvkm_i2c_aux *aux)
156{
157 AUX_TRACE(aux, "init");
158 mutex_lock(&aux->mutex);
159 aux->enabled = true;
160 mutex_unlock(&aux->mutex);
161}
162
163void
164nvkm_i2c_aux_fini(struct nvkm_i2c_aux *aux)
165{
166 AUX_TRACE(aux, "fini");
167 mutex_lock(&aux->mutex);
168 aux->enabled = false;
169 mutex_unlock(&aux->mutex);
170}
171
172int
173nvkm_i2c_aux_ctor(const struct nvkm_i2c_aux_func *func,
174 struct nvkm_i2c_pad *pad, int id,
175 struct nvkm_i2c_aux *aux)
176{
177 struct nvkm_device *device = pad->i2c->subdev.device;
178
179 aux->func = func;
180 aux->pad = pad;
181 aux->id = id;
182 mutex_init(&aux->mutex);
183 list_add_tail(&aux->head, &pad->i2c->aux);
184 AUX_TRACE(aux, "ctor");
185
186 snprintf(aux->i2c.name, sizeof(aux->i2c.name), "nvkm-%s-aux-%04x",
187 dev_name(device->dev), id);
188 aux->i2c.owner = THIS_MODULE;
189 aux->i2c.dev.parent = device->dev;
190 aux->i2c.algo = &nvkm_i2c_aux_i2c_algo;
191 return i2c_add_adapter(&aux->i2c);
192}
193
194int
195nvkm_i2c_aux_new_(const struct nvkm_i2c_aux_func *func,
196 struct nvkm_i2c_pad *pad, int id,
197 struct nvkm_i2c_aux **paux)
198{
199 if (!(*paux = kzalloc(sizeof(**paux), GFP_KERNEL)))
200 return -ENOMEM;
201 return nvkm_i2c_aux_ctor(func, pad, id, *paux);
202}
203