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85bc9b51 AP |
1 | /* |
2 | * Allegro A8293 SEC driver | |
3 | * | |
4 | * Copyright (C) 2011 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 | * You should have received a copy of the GNU General Public License along | |
17 | * with this program; if not, write to the Free Software Foundation, Inc., | |
18 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
19 | */ | |
20 | ||
21 | #include "dvb_frontend.h" | |
22 | #include "a8293.h" | |
23 | ||
85bc9b51 | 24 | struct a8293_priv { |
b561baec | 25 | u8 i2c_addr; |
85bc9b51 | 26 | struct i2c_adapter *i2c; |
b561baec | 27 | struct i2c_client *client; |
85bc9b51 AP |
28 | u8 reg[2]; |
29 | }; | |
30 | ||
31 | static int a8293_i2c(struct a8293_priv *priv, u8 *val, int len, bool rd) | |
32 | { | |
33 | int ret; | |
34 | struct i2c_msg msg[1] = { | |
35 | { | |
b561baec | 36 | .addr = priv->i2c_addr, |
85bc9b51 AP |
37 | .len = len, |
38 | .buf = val, | |
39 | } | |
40 | }; | |
41 | ||
42 | if (rd) | |
43 | msg[0].flags = I2C_M_RD; | |
44 | else | |
45 | msg[0].flags = 0; | |
46 | ||
47 | ret = i2c_transfer(priv->i2c, msg, 1); | |
48 | if (ret == 1) { | |
49 | ret = 0; | |
50 | } else { | |
acc4e826 AP |
51 | dev_warn(&priv->i2c->dev, "%s: i2c failed=%d rd=%d\n", |
52 | KBUILD_MODNAME, ret, rd); | |
85bc9b51 AP |
53 | ret = -EREMOTEIO; |
54 | } | |
55 | ||
56 | return ret; | |
57 | } | |
58 | ||
59 | static int a8293_wr(struct a8293_priv *priv, u8 *val, int len) | |
60 | { | |
61 | return a8293_i2c(priv, val, len, 0); | |
62 | } | |
63 | ||
64 | static int a8293_rd(struct a8293_priv *priv, u8 *val, int len) | |
65 | { | |
66 | return a8293_i2c(priv, val, len, 1); | |
67 | } | |
68 | ||
69 | static int a8293_set_voltage(struct dvb_frontend *fe, | |
0df289a2 | 70 | enum fe_sec_voltage fe_sec_voltage) |
85bc9b51 AP |
71 | { |
72 | struct a8293_priv *priv = fe->sec_priv; | |
73 | int ret; | |
74 | ||
acc4e826 AP |
75 | dev_dbg(&priv->i2c->dev, "%s: fe_sec_voltage=%d\n", __func__, |
76 | fe_sec_voltage); | |
85bc9b51 AP |
77 | |
78 | switch (fe_sec_voltage) { | |
79 | case SEC_VOLTAGE_OFF: | |
80 | /* ENB=0 */ | |
81 | priv->reg[0] = 0x10; | |
82 | break; | |
83 | case SEC_VOLTAGE_13: | |
84 | /* VSEL0=1, VSEL1=0, VSEL2=0, VSEL3=0, ENB=1*/ | |
85 | priv->reg[0] = 0x31; | |
86 | break; | |
87 | case SEC_VOLTAGE_18: | |
88 | /* VSEL0=0, VSEL1=0, VSEL2=0, VSEL3=1, ENB=1*/ | |
89 | priv->reg[0] = 0x38; | |
90 | break; | |
91 | default: | |
92 | ret = -EINVAL; | |
93 | goto err; | |
c2c1b415 | 94 | } |
85bc9b51 AP |
95 | |
96 | ret = a8293_wr(priv, &priv->reg[0], 1); | |
97 | if (ret) | |
98 | goto err; | |
99 | ||
c0ec1c4d AP |
100 | usleep_range(1500, 50000); |
101 | ||
85bc9b51 AP |
102 | return ret; |
103 | err: | |
acc4e826 | 104 | dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret); |
85bc9b51 AP |
105 | return ret; |
106 | } | |
107 | ||
108 | static void a8293_release_sec(struct dvb_frontend *fe) | |
109 | { | |
85bc9b51 AP |
110 | a8293_set_voltage(fe, SEC_VOLTAGE_OFF); |
111 | ||
112 | kfree(fe->sec_priv); | |
113 | fe->sec_priv = NULL; | |
114 | } | |
115 | ||
116 | struct dvb_frontend *a8293_attach(struct dvb_frontend *fe, | |
117 | struct i2c_adapter *i2c, const struct a8293_config *cfg) | |
118 | { | |
119 | int ret; | |
120 | struct a8293_priv *priv = NULL; | |
121 | u8 buf[2]; | |
122 | ||
123 | /* allocate memory for the internal priv */ | |
124 | priv = kzalloc(sizeof(struct a8293_priv), GFP_KERNEL); | |
125 | if (priv == NULL) { | |
126 | ret = -ENOMEM; | |
127 | goto err; | |
128 | } | |
129 | ||
130 | /* setup the priv */ | |
131 | priv->i2c = i2c; | |
b561baec | 132 | priv->i2c_addr = cfg->i2c_addr; |
85bc9b51 AP |
133 | fe->sec_priv = priv; |
134 | ||
135 | /* check if the SEC is there */ | |
136 | ret = a8293_rd(priv, buf, 2); | |
137 | if (ret) | |
138 | goto err; | |
139 | ||
140 | /* ENB=0 */ | |
141 | priv->reg[0] = 0x10; | |
f3e16df6 | 142 | ret = a8293_wr(priv, &priv->reg[0], 1); |
85bc9b51 AP |
143 | if (ret) |
144 | goto err; | |
145 | ||
146 | /* TMODE=0, TGATE=1 */ | |
147 | priv->reg[1] = 0x82; | |
148 | ret = a8293_wr(priv, &priv->reg[1], 1); | |
149 | if (ret) | |
150 | goto err; | |
151 | ||
85bc9b51 AP |
152 | fe->ops.release_sec = a8293_release_sec; |
153 | ||
154 | /* override frontend ops */ | |
155 | fe->ops.set_voltage = a8293_set_voltage; | |
156 | ||
acc4e826 AP |
157 | dev_info(&priv->i2c->dev, "%s: Allegro A8293 SEC attached\n", |
158 | KBUILD_MODNAME); | |
159 | ||
85bc9b51 AP |
160 | return fe; |
161 | err: | |
acc4e826 | 162 | dev_dbg(&i2c->dev, "%s: failed=%d\n", __func__, ret); |
85bc9b51 AP |
163 | kfree(priv); |
164 | return NULL; | |
165 | } | |
166 | EXPORT_SYMBOL(a8293_attach); | |
167 | ||
b561baec AP |
168 | static int a8293_probe(struct i2c_client *client, |
169 | const struct i2c_device_id *id) | |
170 | { | |
171 | struct a8293_priv *dev; | |
172 | struct a8293_platform_data *pdata = client->dev.platform_data; | |
173 | struct dvb_frontend *fe = pdata->dvb_frontend; | |
174 | int ret; | |
175 | u8 buf[2]; | |
176 | ||
177 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
178 | if (!dev) { | |
179 | ret = -ENOMEM; | |
180 | goto err; | |
181 | } | |
182 | ||
183 | dev->client = client; | |
184 | dev->i2c = client->adapter; | |
185 | dev->i2c_addr = client->addr; | |
186 | ||
187 | /* check if the SEC is there */ | |
188 | ret = a8293_rd(dev, buf, 2); | |
189 | if (ret) | |
190 | goto err_kfree; | |
191 | ||
192 | /* ENB=0 */ | |
193 | dev->reg[0] = 0x10; | |
194 | ret = a8293_wr(dev, &dev->reg[0], 1); | |
195 | if (ret) | |
196 | goto err_kfree; | |
197 | ||
198 | /* TMODE=0, TGATE=1 */ | |
199 | dev->reg[1] = 0x82; | |
200 | ret = a8293_wr(dev, &dev->reg[1], 1); | |
201 | if (ret) | |
202 | goto err_kfree; | |
203 | ||
204 | /* override frontend ops */ | |
205 | fe->ops.set_voltage = a8293_set_voltage; | |
206 | ||
207 | fe->sec_priv = dev; | |
208 | i2c_set_clientdata(client, dev); | |
209 | ||
210 | dev_info(&client->dev, "Allegro A8293 SEC successfully attached\n"); | |
211 | return 0; | |
212 | err_kfree: | |
213 | kfree(dev); | |
214 | err: | |
215 | dev_dbg(&client->dev, "failed=%d\n", ret); | |
216 | return ret; | |
217 | } | |
218 | ||
219 | static int a8293_remove(struct i2c_client *client) | |
220 | { | |
221 | struct a8293_dev *dev = i2c_get_clientdata(client); | |
222 | ||
223 | dev_dbg(&client->dev, "\n"); | |
224 | ||
225 | kfree(dev); | |
226 | return 0; | |
227 | } | |
228 | ||
229 | static const struct i2c_device_id a8293_id_table[] = { | |
230 | {"a8293", 0}, | |
231 | {} | |
232 | }; | |
233 | MODULE_DEVICE_TABLE(i2c, a8293_id_table); | |
234 | ||
235 | static struct i2c_driver a8293_driver = { | |
236 | .driver = { | |
237 | .owner = THIS_MODULE, | |
238 | .name = "a8293", | |
239 | .suppress_bind_attrs = true, | |
240 | }, | |
241 | .probe = a8293_probe, | |
242 | .remove = a8293_remove, | |
243 | .id_table = a8293_id_table, | |
244 | }; | |
245 | ||
246 | module_i2c_driver(a8293_driver); | |
247 | ||
85bc9b51 AP |
248 | MODULE_AUTHOR("Antti Palosaari <crope@iki.fi>"); |
249 | MODULE_DESCRIPTION("Allegro A8293 SEC driver"); | |
250 | MODULE_LICENSE("GPL"); |