1 /*
2 * NXP TDA18212HN silicon tuner 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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
22
23 #include "tda18212.h"
24
25 struct tda18212_priv {
26 struct tda18212_config *cfg;
27 struct i2c_adapter *i2c;
28
29 u32 if_frequency;
30 };
31
32 #define dbg(fmt, arg...) \
33 do { \
34 if (debug) \
35 pr_info("%s: " fmt, __func__, ##arg); \
36 } while (0)
37
38 static int debug;
39 module_param(debug, int, 0644);
40 MODULE_PARM_DESC(debug, "Turn on/off debugging (default:off).");
41
42 /* write multiple registers */
tda18212_wr_regs(struct tda18212_priv * priv,u8 reg,u8 * val,int len)43 static int tda18212_wr_regs(struct tda18212_priv *priv, u8 reg, u8 *val,
44 int len)
45 {
46 int ret;
47 u8 buf[len+1];
48 struct i2c_msg msg[1] = {
49 {
50 .addr = priv->cfg->i2c_address,
51 .flags = 0,
52 .len = sizeof(buf),
53 .buf = buf,
54 }
55 };
56
57 buf[0] = reg;
58 memcpy(&buf[1], val, len);
59
60 ret = i2c_transfer(priv->i2c, msg, 1);
61 if (ret == 1) {
62 ret = 0;
63 } else {
64 pr_warn("i2c wr failed ret:%d reg:%02x len:%d\n",
65 ret, reg, len);
66 ret = -EREMOTEIO;
67 }
68 return ret;
69 }
70
71 /* read multiple registers */
tda18212_rd_regs(struct tda18212_priv * priv,u8 reg,u8 * val,int len)72 static int tda18212_rd_regs(struct tda18212_priv *priv, u8 reg, u8 *val,
73 int len)
74 {
75 int ret;
76 u8 buf[len];
77 struct i2c_msg msg[2] = {
78 {
79 .addr = priv->cfg->i2c_address,
80 .flags = 0,
81 .len = 1,
82 .buf = ®,
83 }, {
84 .addr = priv->cfg->i2c_address,
85 .flags = I2C_M_RD,
86 .len = sizeof(buf),
87 .buf = buf,
88 }
89 };
90
91 ret = i2c_transfer(priv->i2c, msg, 2);
92 if (ret == 2) {
93 memcpy(val, buf, len);
94 ret = 0;
95 } else {
96 pr_warn("i2c rd failed ret:%d reg:%02x len:%d\n",
97 ret, reg, len);
98 ret = -EREMOTEIO;
99 }
100
101 return ret;
102 }
103
104 /* write single register */
tda18212_wr_reg(struct tda18212_priv * priv,u8 reg,u8 val)105 static int tda18212_wr_reg(struct tda18212_priv *priv, u8 reg, u8 val)
106 {
107 return tda18212_wr_regs(priv, reg, &val, 1);
108 }
109
110 /* read single register */
tda18212_rd_reg(struct tda18212_priv * priv,u8 reg,u8 * val)111 static int tda18212_rd_reg(struct tda18212_priv *priv, u8 reg, u8 *val)
112 {
113 return tda18212_rd_regs(priv, reg, val, 1);
114 }
115
116 #if 0 /* keep, useful when developing driver */
117 static void tda18212_dump_regs(struct tda18212_priv *priv)
118 {
119 int i;
120 u8 buf[256];
121
122 #define TDA18212_RD_LEN 32
123 for (i = 0; i < sizeof(buf); i += TDA18212_RD_LEN)
124 tda18212_rd_regs(priv, i, &buf[i], TDA18212_RD_LEN);
125
126 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_OFFSET, 32, 1, buf,
127 sizeof(buf), true);
128
129 return;
130 }
131 #endif
132
tda18212_set_params(struct dvb_frontend * fe)133 static int tda18212_set_params(struct dvb_frontend *fe)
134 {
135 struct tda18212_priv *priv = fe->tuner_priv;
136 struct dtv_frontend_properties *c = &fe->dtv_property_cache;
137 int ret, i;
138 u32 if_khz;
139 u8 buf[9];
140 #define DVBT_6 0
141 #define DVBT_7 1
142 #define DVBT_8 2
143 #define DVBT2_6 3
144 #define DVBT2_7 4
145 #define DVBT2_8 5
146 #define DVBC_6 6
147 #define DVBC_8 7
148 static const u8 bw_params[][3] = {
149 /* reg: 0f 13 23 */
150 [DVBT_6] = { 0xb3, 0x20, 0x03 },
151 [DVBT_7] = { 0xb3, 0x31, 0x01 },
152 [DVBT_8] = { 0xb3, 0x22, 0x01 },
153 [DVBT2_6] = { 0xbc, 0x20, 0x03 },
154 [DVBT2_7] = { 0xbc, 0x72, 0x03 },
155 [DVBT2_8] = { 0xbc, 0x22, 0x01 },
156 [DVBC_6] = { 0x92, 0x50, 0x03 },
157 [DVBC_8] = { 0x92, 0x53, 0x03 },
158 };
159
160 dbg("delsys=%d RF=%d BW=%d\n",
161 c->delivery_system, c->frequency, c->bandwidth_hz);
162
163 if (fe->ops.i2c_gate_ctrl)
164 fe->ops.i2c_gate_ctrl(fe, 1); /* open I2C-gate */
165
166 switch (c->delivery_system) {
167 case SYS_DVBT:
168 switch (c->bandwidth_hz) {
169 case 6000000:
170 if_khz = priv->cfg->if_dvbt_6;
171 i = DVBT_6;
172 break;
173 case 7000000:
174 if_khz = priv->cfg->if_dvbt_7;
175 i = DVBT_7;
176 break;
177 case 8000000:
178 if_khz = priv->cfg->if_dvbt_8;
179 i = DVBT_8;
180 break;
181 default:
182 ret = -EINVAL;
183 goto error;
184 }
185 break;
186 case SYS_DVBT2:
187 switch (c->bandwidth_hz) {
188 case 6000000:
189 if_khz = priv->cfg->if_dvbt2_6;
190 i = DVBT2_6;
191 break;
192 case 7000000:
193 if_khz = priv->cfg->if_dvbt2_7;
194 i = DVBT2_7;
195 break;
196 case 8000000:
197 if_khz = priv->cfg->if_dvbt2_8;
198 i = DVBT2_8;
199 break;
200 default:
201 ret = -EINVAL;
202 goto error;
203 }
204 break;
205 case SYS_DVBC_ANNEX_A:
206 case SYS_DVBC_ANNEX_C:
207 if_khz = priv->cfg->if_dvbc;
208 i = DVBC_8;
209 break;
210 default:
211 ret = -EINVAL;
212 goto error;
213 }
214
215 ret = tda18212_wr_reg(priv, 0x23, bw_params[i][2]);
216 if (ret)
217 goto error;
218
219 ret = tda18212_wr_reg(priv, 0x06, 0x00);
220 if (ret)
221 goto error;
222
223 ret = tda18212_wr_reg(priv, 0x0f, bw_params[i][0]);
224 if (ret)
225 goto error;
226
227 buf[0] = 0x02;
228 buf[1] = bw_params[i][1];
229 buf[2] = 0x03; /* default value */
230 buf[3] = DIV_ROUND_CLOSEST(if_khz, 50);
231 buf[4] = ((c->frequency / 1000) >> 16) & 0xff;
232 buf[5] = ((c->frequency / 1000) >> 8) & 0xff;
233 buf[6] = ((c->frequency / 1000) >> 0) & 0xff;
234 buf[7] = 0xc1;
235 buf[8] = 0x01;
236 ret = tda18212_wr_regs(priv, 0x12, buf, sizeof(buf));
237 if (ret)
238 goto error;
239
240 /* actual IF rounded as it is on register */
241 priv->if_frequency = buf[3] * 50 * 1000;
242
243 exit:
244 if (fe->ops.i2c_gate_ctrl)
245 fe->ops.i2c_gate_ctrl(fe, 0); /* close I2C-gate */
246
247 return ret;
248
249 error:
250 dbg("failed:%d\n", ret);
251 goto exit;
252 }
253
tda18212_get_if_frequency(struct dvb_frontend * fe,u32 * frequency)254 static int tda18212_get_if_frequency(struct dvb_frontend *fe, u32 *frequency)
255 {
256 struct tda18212_priv *priv = fe->tuner_priv;
257
258 *frequency = priv->if_frequency;
259
260 return 0;
261 }
262
tda18212_release(struct dvb_frontend * fe)263 static int tda18212_release(struct dvb_frontend *fe)
264 {
265 kfree(fe->tuner_priv);
266 fe->tuner_priv = NULL;
267 return 0;
268 }
269
270 static const struct dvb_tuner_ops tda18212_tuner_ops = {
271 .info = {
272 .name = "NXP TDA18212",
273
274 .frequency_min = 48000000,
275 .frequency_max = 864000000,
276 .frequency_step = 1000,
277 },
278
279 .release = tda18212_release,
280
281 .set_params = tda18212_set_params,
282 .get_if_frequency = tda18212_get_if_frequency,
283 };
284
tda18212_attach(struct dvb_frontend * fe,struct i2c_adapter * i2c,struct tda18212_config * cfg)285 struct dvb_frontend *tda18212_attach(struct dvb_frontend *fe,
286 struct i2c_adapter *i2c, struct tda18212_config *cfg)
287 {
288 struct tda18212_priv *priv = NULL;
289 int ret;
290 u8 val;
291
292 priv = kzalloc(sizeof(struct tda18212_priv), GFP_KERNEL);
293 if (priv == NULL)
294 return NULL;
295
296 priv->cfg = cfg;
297 priv->i2c = i2c;
298 fe->tuner_priv = priv;
299
300 if (fe->ops.i2c_gate_ctrl)
301 fe->ops.i2c_gate_ctrl(fe, 1); /* open I2C-gate */
302
303 /* check if the tuner is there */
304 ret = tda18212_rd_reg(priv, 0x00, &val);
305
306 if (fe->ops.i2c_gate_ctrl)
307 fe->ops.i2c_gate_ctrl(fe, 0); /* close I2C-gate */
308
309 dbg("ret:%d chip ID:%02x\n", ret, val);
310 if (ret || val != 0xc7) {
311 kfree(priv);
312 return NULL;
313 }
314
315 pr_info("NXP TDA18212HN successfully identified\n");
316
317 memcpy(&fe->ops.tuner_ops, &tda18212_tuner_ops,
318 sizeof(struct dvb_tuner_ops));
319
320 return fe;
321 }
322 EXPORT_SYMBOL(tda18212_attach);
323
324 MODULE_DESCRIPTION("NXP TDA18212HN silicon tuner driver");
325 MODULE_AUTHOR("Antti Palosaari <crope@iki.fi>");
326 MODULE_LICENSE("GPL");
327