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ba92ae0f AP |
1 | /* |
2 | * Silicon Labs Si2157 silicon tuner driver | |
3 | * | |
4 | * Copyright (C) 2014 Antti Palosaari <crope@iki.fi> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | */ | |
16 | ||
930a8730 AP |
17 | #include "si2157_priv.h" |
18 | ||
19 | /* execute firmware command */ | |
20 | static int si2157_cmd_execute(struct si2157 *s, struct si2157_cmd *cmd) | |
21 | { | |
22 | int ret; | |
23 | u8 buf[1]; | |
24 | unsigned long timeout; | |
25 | ||
26 | mutex_lock(&s->i2c_mutex); | |
27 | ||
28 | if (cmd->len) { | |
29 | /* write cmd and args for firmware */ | |
30 | ret = i2c_master_send(s->client, cmd->args, cmd->len); | |
31 | if (ret < 0) { | |
32 | goto err_mutex_unlock; | |
33 | } else if (ret != cmd->len) { | |
34 | ret = -EREMOTEIO; | |
35 | goto err_mutex_unlock; | |
36 | } | |
37 | } | |
38 | ||
39 | /* wait cmd execution terminate */ | |
40 | #define TIMEOUT 80 | |
41 | timeout = jiffies + msecs_to_jiffies(TIMEOUT); | |
42 | while (!time_after(jiffies, timeout)) { | |
43 | ret = i2c_master_recv(s->client, buf, 1); | |
44 | if (ret < 0) { | |
45 | goto err_mutex_unlock; | |
46 | } else if (ret != 1) { | |
47 | ret = -EREMOTEIO; | |
48 | goto err_mutex_unlock; | |
49 | } | |
50 | ||
51 | /* firmware ready? */ | |
52 | if ((buf[0] >> 7) & 0x01) | |
53 | break; | |
54 | } | |
55 | ||
56 | dev_dbg(&s->client->dev, "%s: cmd execution took %d ms\n", __func__, | |
57 | jiffies_to_msecs(jiffies) - | |
58 | (jiffies_to_msecs(timeout) - TIMEOUT)); | |
59 | ||
60 | if (!(buf[0] >> 7) & 0x01) { | |
61 | ret = -ETIMEDOUT; | |
62 | goto err_mutex_unlock; | |
63 | } else { | |
64 | ret = 0; | |
65 | } | |
66 | ||
67 | err_mutex_unlock: | |
68 | mutex_unlock(&s->i2c_mutex); | |
69 | if (ret) | |
70 | goto err; | |
71 | ||
72 | return 0; | |
73 | err: | |
74 | dev_dbg(&s->client->dev, "%s: failed=%d\n", __func__, ret); | |
75 | return ret; | |
76 | } | |
77 | ||
78 | static int si2157_init(struct dvb_frontend *fe) | |
79 | { | |
80 | struct si2157 *s = fe->tuner_priv; | |
81 | ||
82 | dev_dbg(&s->client->dev, "%s:\n", __func__); | |
83 | ||
84 | s->active = true; | |
85 | ||
86 | return 0; | |
87 | } | |
88 | ||
89 | static int si2157_sleep(struct dvb_frontend *fe) | |
90 | { | |
91 | struct si2157 *s = fe->tuner_priv; | |
92 | ||
93 | dev_dbg(&s->client->dev, "%s:\n", __func__); | |
94 | ||
95 | s->active = false; | |
96 | ||
97 | return 0; | |
98 | } | |
99 | ||
100 | static int si2157_set_params(struct dvb_frontend *fe) | |
101 | { | |
102 | struct si2157 *s = fe->tuner_priv; | |
103 | struct dtv_frontend_properties *c = &fe->dtv_property_cache; | |
104 | int ret; | |
105 | struct si2157_cmd cmd; | |
106 | ||
107 | dev_dbg(&s->client->dev, | |
108 | "%s: delivery_system=%d frequency=%u bandwidth_hz=%u\n", | |
109 | __func__, c->delivery_system, c->frequency, | |
110 | c->bandwidth_hz); | |
111 | ||
112 | if (!s->active) { | |
113 | ret = -EAGAIN; | |
114 | goto err; | |
115 | } | |
116 | ||
117 | /* configure? */ | |
118 | cmd.args[0] = 0xc0; | |
119 | cmd.args[1] = 0x00; | |
120 | cmd.args[2] = 0x0c; | |
121 | cmd.args[3] = 0x00; | |
122 | cmd.args[4] = 0x00; | |
123 | cmd.args[5] = 0x01; | |
124 | cmd.args[6] = 0x01; | |
125 | cmd.args[7] = 0x01; | |
126 | cmd.args[8] = 0x01; | |
127 | cmd.args[9] = 0x01; | |
128 | cmd.args[10] = 0x01; | |
129 | cmd.args[11] = 0x02; | |
130 | cmd.args[12] = 0x00; | |
131 | cmd.args[13] = 0x00; | |
132 | cmd.args[14] = 0x01; | |
133 | cmd.len = 15; | |
134 | ret = si2157_cmd_execute(s, &cmd); | |
135 | if (ret) | |
136 | goto err; | |
137 | ||
138 | cmd.args[0] = 0x02; | |
139 | cmd.len = 1; | |
140 | ret = si2157_cmd_execute(s, &cmd); | |
141 | if (ret) | |
142 | goto err; | |
143 | ||
144 | cmd.args[0] = 0x01; | |
145 | cmd.args[1] = 0x01; | |
146 | cmd.len = 2; | |
147 | ret = si2157_cmd_execute(s, &cmd); | |
148 | if (ret) | |
149 | goto err; | |
150 | ||
151 | /* set frequency */ | |
152 | cmd.args[0] = 0x41; | |
153 | cmd.args[1] = 0x00; | |
154 | cmd.args[2] = 0x00; | |
155 | cmd.args[3] = 0x00; | |
156 | cmd.args[4] = (c->frequency >> 0) & 0xff; | |
157 | cmd.args[5] = (c->frequency >> 8) & 0xff; | |
158 | cmd.args[6] = (c->frequency >> 16) & 0xff; | |
159 | cmd.args[7] = (c->frequency >> 24) & 0xff; | |
160 | cmd.len = 8; | |
161 | ret = si2157_cmd_execute(s, &cmd); | |
162 | if (ret) | |
163 | goto err; | |
164 | ||
165 | return 0; | |
166 | err: | |
167 | dev_dbg(&s->client->dev, "%s: failed=%d\n", __func__, ret); | |
168 | return ret; | |
169 | } | |
170 | ||
171 | static const struct dvb_tuner_ops si2157_tuner_ops = { | |
172 | .info = { | |
173 | .name = "Silicon Labs Si2157", | |
ae4c8919 | 174 | .frequency_min = 110000000, |
930a8730 AP |
175 | .frequency_max = 862000000, |
176 | }, | |
177 | ||
178 | .init = si2157_init, | |
179 | .sleep = si2157_sleep, | |
180 | .set_params = si2157_set_params, | |
181 | }; | |
182 | ||
183 | static int si2157_probe(struct i2c_client *client, | |
184 | const struct i2c_device_id *id) | |
185 | { | |
186 | struct si2157_config *cfg = client->dev.platform_data; | |
187 | struct dvb_frontend *fe = cfg->fe; | |
188 | struct si2157 *s; | |
189 | struct si2157_cmd cmd; | |
190 | int ret; | |
191 | ||
192 | s = kzalloc(sizeof(struct si2157), GFP_KERNEL); | |
193 | if (!s) { | |
194 | ret = -ENOMEM; | |
195 | dev_err(&client->dev, "%s: kzalloc() failed\n", KBUILD_MODNAME); | |
196 | goto err; | |
197 | } | |
198 | ||
199 | s->client = client; | |
200 | s->fe = cfg->fe; | |
201 | mutex_init(&s->i2c_mutex); | |
202 | ||
203 | /* check if the tuner is there */ | |
204 | cmd.len = 0; | |
205 | ret = si2157_cmd_execute(s, &cmd); | |
206 | if (ret) | |
207 | goto err; | |
208 | ||
209 | fe->tuner_priv = s; | |
210 | memcpy(&fe->ops.tuner_ops, &si2157_tuner_ops, | |
211 | sizeof(struct dvb_tuner_ops)); | |
212 | ||
213 | i2c_set_clientdata(client, s); | |
214 | ||
215 | dev_info(&s->client->dev, | |
216 | "%s: Silicon Labs Si2157 successfully attached\n", | |
217 | KBUILD_MODNAME); | |
218 | return 0; | |
219 | err: | |
220 | dev_dbg(&client->dev, "%s: failed=%d\n", __func__, ret); | |
221 | kfree(s); | |
222 | ||
223 | return ret; | |
224 | } | |
225 | ||
226 | static int si2157_remove(struct i2c_client *client) | |
227 | { | |
228 | struct si2157 *s = i2c_get_clientdata(client); | |
229 | struct dvb_frontend *fe = s->fe; | |
230 | ||
231 | dev_dbg(&client->dev, "%s:\n", __func__); | |
232 | ||
233 | memset(&fe->ops.tuner_ops, 0, sizeof(struct dvb_tuner_ops)); | |
234 | fe->tuner_priv = NULL; | |
235 | kfree(s); | |
236 | ||
237 | return 0; | |
238 | } | |
239 | ||
240 | static const struct i2c_device_id si2157_id[] = { | |
241 | {"si2157", 0}, | |
242 | {} | |
243 | }; | |
244 | MODULE_DEVICE_TABLE(i2c, si2157_id); | |
245 | ||
246 | static struct i2c_driver si2157_driver = { | |
247 | .driver = { | |
248 | .owner = THIS_MODULE, | |
249 | .name = "si2157", | |
250 | }, | |
251 | .probe = si2157_probe, | |
252 | .remove = si2157_remove, | |
253 | .id_table = si2157_id, | |
254 | }; | |
255 | ||
256 | module_i2c_driver(si2157_driver); | |
257 | ||
258 | MODULE_DESCRIPTION("Silicon Labs Si2157 silicon tuner driver"); | |
259 | MODULE_AUTHOR("Antti Palosaari <crope@iki.fi>"); | |
260 | MODULE_LICENSE("GPL"); |