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b72dbaef JF |
1 | /* |
2 | * Driver for Freescale MC44S803 Low Power CMOS Broadband Tuner | |
3 | * | |
4 | * Copyright (c) 2009 Jochen Friedrich <jochen@scram.de> | |
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 | * | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.= | |
20 | */ | |
21 | ||
22 | #include <linux/module.h> | |
23 | #include <linux/delay.h> | |
24 | #include <linux/dvb/frontend.h> | |
25 | #include <linux/i2c.h> | |
5a0e3ad6 | 26 | #include <linux/slab.h> |
b72dbaef JF |
27 | |
28 | #include "dvb_frontend.h" | |
29 | ||
30 | #include "mc44s803.h" | |
31 | #include "mc44s803_priv.h" | |
32 | ||
33 | #define mc_printk(level, format, arg...) \ | |
34 | printk(level "mc44s803: " format , ## arg) | |
35 | ||
36 | /* Writes a single register */ | |
37 | static int mc44s803_writereg(struct mc44s803_priv *priv, u32 val) | |
38 | { | |
39 | u8 buf[3]; | |
40 | struct i2c_msg msg = { | |
41 | .addr = priv->cfg->i2c_address, .flags = 0, .buf = buf, .len = 3 | |
42 | }; | |
43 | ||
44 | buf[0] = (val & 0xff0000) >> 16; | |
45 | buf[1] = (val & 0xff00) >> 8; | |
46 | buf[2] = (val & 0xff); | |
47 | ||
48 | if (i2c_transfer(priv->i2c, &msg, 1) != 1) { | |
49 | mc_printk(KERN_WARNING, "I2C write failed\n"); | |
50 | return -EREMOTEIO; | |
51 | } | |
52 | return 0; | |
53 | } | |
54 | ||
55 | /* Reads a single register */ | |
56 | static int mc44s803_readreg(struct mc44s803_priv *priv, u8 reg, u32 *val) | |
57 | { | |
58 | u32 wval; | |
59 | u8 buf[3]; | |
60 | int ret; | |
61 | struct i2c_msg msg[] = { | |
62 | { .addr = priv->cfg->i2c_address, .flags = I2C_M_RD, | |
63 | .buf = buf, .len = 3 }, | |
64 | }; | |
65 | ||
66 | wval = MC44S803_REG_SM(MC44S803_REG_DATAREG, MC44S803_ADDR) | | |
67 | MC44S803_REG_SM(reg, MC44S803_D); | |
68 | ||
69 | ret = mc44s803_writereg(priv, wval); | |
70 | if (ret) | |
71 | return ret; | |
72 | ||
73 | if (i2c_transfer(priv->i2c, msg, 1) != 1) { | |
74 | mc_printk(KERN_WARNING, "I2C read failed\n"); | |
75 | return -EREMOTEIO; | |
76 | } | |
77 | ||
78 | *val = (buf[0] << 16) | (buf[1] << 8) | buf[2]; | |
79 | ||
80 | return 0; | |
81 | } | |
82 | ||
83 | static int mc44s803_release(struct dvb_frontend *fe) | |
84 | { | |
85 | struct mc44s803_priv *priv = fe->tuner_priv; | |
86 | ||
87 | fe->tuner_priv = NULL; | |
88 | kfree(priv); | |
89 | ||
90 | return 0; | |
91 | } | |
92 | ||
93 | static int mc44s803_init(struct dvb_frontend *fe) | |
94 | { | |
95 | struct mc44s803_priv *priv = fe->tuner_priv; | |
96 | u32 val; | |
97 | int err; | |
98 | ||
99 | if (fe->ops.i2c_gate_ctrl) | |
100 | fe->ops.i2c_gate_ctrl(fe, 1); | |
101 | ||
102 | /* Reset chip */ | |
103 | val = MC44S803_REG_SM(MC44S803_REG_RESET, MC44S803_ADDR) | | |
104 | MC44S803_REG_SM(1, MC44S803_RS); | |
105 | ||
106 | err = mc44s803_writereg(priv, val); | |
107 | if (err) | |
108 | goto exit; | |
109 | ||
110 | val = MC44S803_REG_SM(MC44S803_REG_RESET, MC44S803_ADDR); | |
111 | ||
112 | err = mc44s803_writereg(priv, val); | |
113 | if (err) | |
114 | goto exit; | |
115 | ||
116 | /* Power Up and Start Osc */ | |
117 | ||
118 | val = MC44S803_REG_SM(MC44S803_REG_REFOSC, MC44S803_ADDR) | | |
119 | MC44S803_REG_SM(0xC0, MC44S803_REFOSC) | | |
120 | MC44S803_REG_SM(1, MC44S803_OSCSEL); | |
121 | ||
122 | err = mc44s803_writereg(priv, val); | |
123 | if (err) | |
124 | goto exit; | |
125 | ||
126 | val = MC44S803_REG_SM(MC44S803_REG_POWER, MC44S803_ADDR) | | |
127 | MC44S803_REG_SM(0x200, MC44S803_POWER); | |
128 | ||
129 | err = mc44s803_writereg(priv, val); | |
130 | if (err) | |
131 | goto exit; | |
132 | ||
133 | msleep(10); | |
134 | ||
135 | val = MC44S803_REG_SM(MC44S803_REG_REFOSC, MC44S803_ADDR) | | |
136 | MC44S803_REG_SM(0x40, MC44S803_REFOSC) | | |
137 | MC44S803_REG_SM(1, MC44S803_OSCSEL); | |
138 | ||
139 | err = mc44s803_writereg(priv, val); | |
140 | if (err) | |
141 | goto exit; | |
142 | ||
143 | msleep(20); | |
144 | ||
145 | /* Setup Mixer */ | |
146 | ||
147 | val = MC44S803_REG_SM(MC44S803_REG_MIXER, MC44S803_ADDR) | | |
148 | MC44S803_REG_SM(1, MC44S803_TRI_STATE) | | |
149 | MC44S803_REG_SM(0x7F, MC44S803_MIXER_RES); | |
150 | ||
151 | err = mc44s803_writereg(priv, val); | |
152 | if (err) | |
153 | goto exit; | |
154 | ||
155 | /* Setup Cirquit Adjust */ | |
156 | ||
157 | val = MC44S803_REG_SM(MC44S803_REG_CIRCADJ, MC44S803_ADDR) | | |
158 | MC44S803_REG_SM(1, MC44S803_G1) | | |
159 | MC44S803_REG_SM(1, MC44S803_G3) | | |
160 | MC44S803_REG_SM(0x3, MC44S803_CIRCADJ_RES) | | |
161 | MC44S803_REG_SM(1, MC44S803_G6) | | |
162 | MC44S803_REG_SM(priv->cfg->dig_out, MC44S803_S1) | | |
163 | MC44S803_REG_SM(0x3, MC44S803_LP) | | |
164 | MC44S803_REG_SM(1, MC44S803_CLRF) | | |
165 | MC44S803_REG_SM(1, MC44S803_CLIF); | |
166 | ||
167 | err = mc44s803_writereg(priv, val); | |
168 | if (err) | |
169 | goto exit; | |
170 | ||
171 | val = MC44S803_REG_SM(MC44S803_REG_CIRCADJ, MC44S803_ADDR) | | |
172 | MC44S803_REG_SM(1, MC44S803_G1) | | |
173 | MC44S803_REG_SM(1, MC44S803_G3) | | |
174 | MC44S803_REG_SM(0x3, MC44S803_CIRCADJ_RES) | | |
175 | MC44S803_REG_SM(1, MC44S803_G6) | | |
176 | MC44S803_REG_SM(priv->cfg->dig_out, MC44S803_S1) | | |
177 | MC44S803_REG_SM(0x3, MC44S803_LP); | |
178 | ||
179 | err = mc44s803_writereg(priv, val); | |
180 | if (err) | |
181 | goto exit; | |
182 | ||
183 | /* Setup Digtune */ | |
184 | ||
185 | val = MC44S803_REG_SM(MC44S803_REG_DIGTUNE, MC44S803_ADDR) | | |
186 | MC44S803_REG_SM(3, MC44S803_XOD); | |
187 | ||
188 | err = mc44s803_writereg(priv, val); | |
189 | if (err) | |
190 | goto exit; | |
191 | ||
192 | /* Setup AGC */ | |
193 | ||
194 | val = MC44S803_REG_SM(MC44S803_REG_LNAAGC, MC44S803_ADDR) | | |
195 | MC44S803_REG_SM(1, MC44S803_AT1) | | |
196 | MC44S803_REG_SM(1, MC44S803_AT2) | | |
197 | MC44S803_REG_SM(1, MC44S803_AGC_AN_DIG) | | |
198 | MC44S803_REG_SM(1, MC44S803_AGC_READ_EN) | | |
199 | MC44S803_REG_SM(1, MC44S803_LNA0); | |
200 | ||
201 | err = mc44s803_writereg(priv, val); | |
202 | if (err) | |
203 | goto exit; | |
204 | ||
205 | if (fe->ops.i2c_gate_ctrl) | |
206 | fe->ops.i2c_gate_ctrl(fe, 0); | |
207 | return 0; | |
208 | ||
209 | exit: | |
210 | if (fe->ops.i2c_gate_ctrl) | |
211 | fe->ops.i2c_gate_ctrl(fe, 0); | |
212 | ||
213 | mc_printk(KERN_WARNING, "I/O Error\n"); | |
214 | return err; | |
215 | } | |
216 | ||
14d24d14 | 217 | static int mc44s803_set_params(struct dvb_frontend *fe) |
b72dbaef JF |
218 | { |
219 | struct mc44s803_priv *priv = fe->tuner_priv; | |
35fea064 | 220 | struct dtv_frontend_properties *c = &fe->dtv_property_cache; |
b72dbaef JF |
221 | u32 r1, r2, n1, n2, lo1, lo2, freq, val; |
222 | int err; | |
223 | ||
35fea064 | 224 | priv->frequency = c->frequency; |
b72dbaef JF |
225 | |
226 | r1 = MC44S803_OSC / 1000000; | |
227 | r2 = MC44S803_OSC / 100000; | |
228 | ||
35fea064 | 229 | n1 = (c->frequency + MC44S803_IF1 + 500000) / 1000000; |
b72dbaef JF |
230 | freq = MC44S803_OSC / r1 * n1; |
231 | lo1 = ((60 * n1) + (r1 / 2)) / r1; | |
35fea064 | 232 | freq = freq - c->frequency; |
b72dbaef JF |
233 | |
234 | n2 = (freq - MC44S803_IF2 + 50000) / 100000; | |
235 | lo2 = ((60 * n2) + (r2 / 2)) / r2; | |
236 | ||
237 | if (fe->ops.i2c_gate_ctrl) | |
238 | fe->ops.i2c_gate_ctrl(fe, 1); | |
239 | ||
240 | val = MC44S803_REG_SM(MC44S803_REG_REFDIV, MC44S803_ADDR) | | |
241 | MC44S803_REG_SM(r1-1, MC44S803_R1) | | |
242 | MC44S803_REG_SM(r2-1, MC44S803_R2) | | |
243 | MC44S803_REG_SM(1, MC44S803_REFBUF_EN); | |
244 | ||
245 | err = mc44s803_writereg(priv, val); | |
246 | if (err) | |
247 | goto exit; | |
248 | ||
249 | val = MC44S803_REG_SM(MC44S803_REG_LO1, MC44S803_ADDR) | | |
250 | MC44S803_REG_SM(n1-2, MC44S803_LO1); | |
251 | ||
252 | err = mc44s803_writereg(priv, val); | |
253 | if (err) | |
254 | goto exit; | |
255 | ||
256 | val = MC44S803_REG_SM(MC44S803_REG_LO2, MC44S803_ADDR) | | |
257 | MC44S803_REG_SM(n2-2, MC44S803_LO2); | |
258 | ||
259 | err = mc44s803_writereg(priv, val); | |
260 | if (err) | |
261 | goto exit; | |
262 | ||
263 | val = MC44S803_REG_SM(MC44S803_REG_DIGTUNE, MC44S803_ADDR) | | |
264 | MC44S803_REG_SM(1, MC44S803_DA) | | |
265 | MC44S803_REG_SM(lo1, MC44S803_LO_REF) | | |
266 | MC44S803_REG_SM(1, MC44S803_AT); | |
267 | ||
268 | err = mc44s803_writereg(priv, val); | |
269 | if (err) | |
270 | goto exit; | |
271 | ||
272 | val = MC44S803_REG_SM(MC44S803_REG_DIGTUNE, MC44S803_ADDR) | | |
273 | MC44S803_REG_SM(2, MC44S803_DA) | | |
274 | MC44S803_REG_SM(lo2, MC44S803_LO_REF) | | |
275 | MC44S803_REG_SM(1, MC44S803_AT); | |
276 | ||
277 | err = mc44s803_writereg(priv, val); | |
278 | if (err) | |
279 | goto exit; | |
280 | ||
281 | if (fe->ops.i2c_gate_ctrl) | |
282 | fe->ops.i2c_gate_ctrl(fe, 0); | |
283 | ||
284 | return 0; | |
285 | ||
286 | exit: | |
287 | if (fe->ops.i2c_gate_ctrl) | |
288 | fe->ops.i2c_gate_ctrl(fe, 0); | |
289 | ||
290 | mc_printk(KERN_WARNING, "I/O Error\n"); | |
291 | return err; | |
292 | } | |
293 | ||
294 | static int mc44s803_get_frequency(struct dvb_frontend *fe, u32 *frequency) | |
295 | { | |
296 | struct mc44s803_priv *priv = fe->tuner_priv; | |
297 | *frequency = priv->frequency; | |
298 | return 0; | |
299 | } | |
300 | ||
89fd5ef8 AP |
301 | static int mc44s803_get_if_frequency(struct dvb_frontend *fe, u32 *frequency) |
302 | { | |
303 | *frequency = MC44S803_IF2; /* 36.125 MHz */ | |
304 | return 0; | |
305 | } | |
306 | ||
b72dbaef JF |
307 | static const struct dvb_tuner_ops mc44s803_tuner_ops = { |
308 | .info = { | |
309 | .name = "Freescale MC44S803", | |
310 | .frequency_min = 48000000, | |
311 | .frequency_max = 1000000000, | |
312 | .frequency_step = 100000, | |
313 | }, | |
314 | ||
315 | .release = mc44s803_release, | |
316 | .init = mc44s803_init, | |
317 | .set_params = mc44s803_set_params, | |
89fd5ef8 AP |
318 | .get_frequency = mc44s803_get_frequency, |
319 | .get_if_frequency = mc44s803_get_if_frequency, | |
b72dbaef JF |
320 | }; |
321 | ||
322 | /* This functions tries to identify a MC44S803 tuner by reading the ID | |
323 | register. This is hasty. */ | |
324 | struct dvb_frontend *mc44s803_attach(struct dvb_frontend *fe, | |
325 | struct i2c_adapter *i2c, struct mc44s803_config *cfg) | |
326 | { | |
327 | struct mc44s803_priv *priv; | |
328 | u32 reg; | |
329 | u8 id; | |
330 | int ret; | |
331 | ||
332 | reg = 0; | |
333 | ||
334 | priv = kzalloc(sizeof(struct mc44s803_priv), GFP_KERNEL); | |
335 | if (priv == NULL) | |
336 | return NULL; | |
337 | ||
338 | priv->cfg = cfg; | |
339 | priv->i2c = i2c; | |
340 | priv->fe = fe; | |
341 | ||
342 | if (fe->ops.i2c_gate_ctrl) | |
343 | fe->ops.i2c_gate_ctrl(fe, 1); /* open i2c_gate */ | |
344 | ||
345 | ret = mc44s803_readreg(priv, MC44S803_REG_ID, ®); | |
346 | if (ret) | |
347 | goto error; | |
348 | ||
349 | id = MC44S803_REG_MS(reg, MC44S803_ID); | |
350 | ||
351 | if (id != 0x14) { | |
352 | mc_printk(KERN_ERR, "unsupported ID " | |
353 | "(%x should be 0x14)\n", id); | |
354 | goto error; | |
355 | } | |
356 | ||
357 | mc_printk(KERN_INFO, "successfully identified (ID = %x)\n", id); | |
358 | memcpy(&fe->ops.tuner_ops, &mc44s803_tuner_ops, | |
359 | sizeof(struct dvb_tuner_ops)); | |
360 | ||
361 | fe->tuner_priv = priv; | |
362 | ||
363 | if (fe->ops.i2c_gate_ctrl) | |
364 | fe->ops.i2c_gate_ctrl(fe, 0); /* close i2c_gate */ | |
365 | ||
366 | return fe; | |
367 | ||
368 | error: | |
369 | if (fe->ops.i2c_gate_ctrl) | |
370 | fe->ops.i2c_gate_ctrl(fe, 0); /* close i2c_gate */ | |
371 | ||
372 | kfree(priv); | |
373 | return NULL; | |
374 | } | |
375 | EXPORT_SYMBOL(mc44s803_attach); | |
376 | ||
377 | MODULE_AUTHOR("Jochen Friedrich"); | |
378 | MODULE_DESCRIPTION("Freescale MC44S803 silicon tuner driver"); | |
379 | MODULE_LICENSE("GPL"); |