Linux 2.6.34-rc3
[pohmelfs.git] / drivers / media / dvb / frontends / stv6110.c
blobbef0cc83847129e25a87f83bcc13c5a39935ba2f
1 /*
2 * stv6110.c
4 * Driver for ST STV6110 satellite tuner IC.
6 * Copyright (C) 2009 NetUP Inc.
7 * Copyright (C) 2009 Igor M. Liplianin <liplianin@netup.ru>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25 #include <linux/module.h>
26 #include <linux/dvb/frontend.h>
28 #include <linux/types.h>
30 #include "stv6110.h"
32 static int debug;
34 struct stv6110_priv {
35 int i2c_address;
36 struct i2c_adapter *i2c;
38 u32 mclk;
39 u8 clk_div;
40 u8 gain;
41 u8 regs[8];
44 #define dprintk(args...) \
45 do { \
46 if (debug) \
47 printk(KERN_DEBUG args); \
48 } while (0)
50 static s32 abssub(s32 a, s32 b)
52 if (a > b)
53 return a - b;
54 else
55 return b - a;
58 static int stv6110_release(struct dvb_frontend *fe)
60 kfree(fe->tuner_priv);
61 fe->tuner_priv = NULL;
62 return 0;
65 static int stv6110_write_regs(struct dvb_frontend *fe, u8 buf[],
66 int start, int len)
68 struct stv6110_priv *priv = fe->tuner_priv;
69 int rc;
70 u8 cmdbuf[len + 1];
71 struct i2c_msg msg = {
72 .addr = priv->i2c_address,
73 .flags = 0,
74 .buf = cmdbuf,
75 .len = len + 1
78 dprintk("%s\n", __func__);
80 if (start + len > 8)
81 return -EINVAL;
83 memcpy(&cmdbuf[1], buf, len);
84 cmdbuf[0] = start;
86 if (fe->ops.i2c_gate_ctrl)
87 fe->ops.i2c_gate_ctrl(fe, 1);
89 rc = i2c_transfer(priv->i2c, &msg, 1);
90 if (rc != 1)
91 dprintk("%s: i2c error\n", __func__);
93 if (fe->ops.i2c_gate_ctrl)
94 fe->ops.i2c_gate_ctrl(fe, 0);
96 return 0;
99 static int stv6110_read_regs(struct dvb_frontend *fe, u8 regs[],
100 int start, int len)
102 struct stv6110_priv *priv = fe->tuner_priv;
103 int rc;
104 u8 reg[] = { start };
105 struct i2c_msg msg[] = {
107 .addr = priv->i2c_address,
108 .flags = 0,
109 .buf = reg,
110 .len = 1,
111 }, {
112 .addr = priv->i2c_address,
113 .flags = I2C_M_RD,
114 .buf = regs,
115 .len = len,
119 if (fe->ops.i2c_gate_ctrl)
120 fe->ops.i2c_gate_ctrl(fe, 1);
122 rc = i2c_transfer(priv->i2c, msg, 2);
123 if (rc != 2)
124 dprintk("%s: i2c error\n", __func__);
126 if (fe->ops.i2c_gate_ctrl)
127 fe->ops.i2c_gate_ctrl(fe, 0);
129 memcpy(&priv->regs[start], regs, len);
131 return 0;
134 static int stv6110_read_reg(struct dvb_frontend *fe, int start)
136 u8 buf[] = { 0 };
137 stv6110_read_regs(fe, buf, start, 1);
139 return buf[0];
142 static int stv6110_sleep(struct dvb_frontend *fe)
144 u8 reg[] = { 0 };
145 stv6110_write_regs(fe, reg, 0, 1);
147 return 0;
150 static u32 carrier_width(u32 symbol_rate, fe_rolloff_t rolloff)
152 u32 rlf;
154 switch (rolloff) {
155 case ROLLOFF_20:
156 rlf = 20;
157 break;
158 case ROLLOFF_25:
159 rlf = 25;
160 break;
161 default:
162 rlf = 35;
163 break;
166 return symbol_rate + ((symbol_rate * rlf) / 100);
169 static int stv6110_set_bandwidth(struct dvb_frontend *fe, u32 bandwidth)
171 struct stv6110_priv *priv = fe->tuner_priv;
172 u8 r8, ret = 0x04;
173 int i;
175 if ((bandwidth / 2) > 36000000) /*BW/2 max=31+5=36 mhz for r8=31*/
176 r8 = 31;
177 else if ((bandwidth / 2) < 5000000) /* BW/2 min=5Mhz for F=0 */
178 r8 = 0;
179 else /*if 5 < BW/2 < 36*/
180 r8 = (bandwidth / 2) / 1000000 - 5;
182 /* ctrl3, RCCLKOFF = 0 Activate the calibration Clock */
183 /* ctrl3, CF = r8 Set the LPF value */
184 priv->regs[RSTV6110_CTRL3] &= ~((1 << 6) | 0x1f);
185 priv->regs[RSTV6110_CTRL3] |= (r8 & 0x1f);
186 stv6110_write_regs(fe, &priv->regs[RSTV6110_CTRL3], RSTV6110_CTRL3, 1);
187 /* stat1, CALRCSTRT = 1 Start LPF auto calibration*/
188 priv->regs[RSTV6110_STAT1] |= 0x02;
189 stv6110_write_regs(fe, &priv->regs[RSTV6110_STAT1], RSTV6110_STAT1, 1);
191 i = 0;
192 /* Wait for CALRCSTRT == 0 */
193 while ((i < 10) && (ret != 0)) {
194 ret = ((stv6110_read_reg(fe, RSTV6110_STAT1)) & 0x02);
195 mdelay(1); /* wait for LPF auto calibration */
196 i++;
199 /* RCCLKOFF = 1 calibration done, desactivate the calibration Clock */
200 priv->regs[RSTV6110_CTRL3] |= (1 << 6);
201 stv6110_write_regs(fe, &priv->regs[RSTV6110_CTRL3], RSTV6110_CTRL3, 1);
202 return 0;
205 static int stv6110_init(struct dvb_frontend *fe)
207 struct stv6110_priv *priv = fe->tuner_priv;
208 u8 buf0[] = { 0x07, 0x11, 0xdc, 0x85, 0x17, 0x01, 0xe6, 0x1e };
210 memcpy(priv->regs, buf0, 8);
211 /* K = (Reference / 1000000) - 16 */
212 priv->regs[RSTV6110_CTRL1] &= ~(0x1f << 3);
213 priv->regs[RSTV6110_CTRL1] |=
214 ((((priv->mclk / 1000000) - 16) & 0x1f) << 3);
216 /* divisor value for the output clock */
217 priv->regs[RSTV6110_CTRL2] &= ~0xc0;
218 priv->regs[RSTV6110_CTRL2] |= (priv->clk_div << 6);
220 stv6110_write_regs(fe, &priv->regs[RSTV6110_CTRL1], RSTV6110_CTRL1, 8);
221 msleep(1);
222 stv6110_set_bandwidth(fe, 72000000);
224 return 0;
227 static int stv6110_get_frequency(struct dvb_frontend *fe, u32 *frequency)
229 struct stv6110_priv *priv = fe->tuner_priv;
230 u32 nbsteps, divider, psd2, freq;
231 u8 regs[] = { 0, 0, 0, 0, 0, 0, 0, 0 };
233 stv6110_read_regs(fe, regs, 0, 8);
234 /*N*/
235 divider = (priv->regs[RSTV6110_TUNING2] & 0x0f) << 8;
236 divider += priv->regs[RSTV6110_TUNING1];
238 /*R*/
239 nbsteps = (priv->regs[RSTV6110_TUNING2] >> 6) & 3;
240 /*p*/
241 psd2 = (priv->regs[RSTV6110_TUNING2] >> 4) & 1;
243 freq = divider * (priv->mclk / 1000);
244 freq /= (1 << (nbsteps + psd2));
245 freq /= 4;
247 *frequency = freq;
249 return 0;
252 static int stv6110_set_frequency(struct dvb_frontend *fe, u32 frequency)
254 struct stv6110_priv *priv = fe->tuner_priv;
255 struct dtv_frontend_properties *c = &fe->dtv_property_cache;
256 u8 ret = 0x04;
257 u32 divider, ref, p, presc, i, result_freq, vco_freq;
258 s32 p_calc, p_calc_opt = 1000, r_div, r_div_opt = 0, p_val;
259 s32 srate;
261 dprintk("%s, freq=%d kHz, mclk=%d Hz\n", __func__,
262 frequency, priv->mclk);
264 /* K = (Reference / 1000000) - 16 */
265 priv->regs[RSTV6110_CTRL1] &= ~(0x1f << 3);
266 priv->regs[RSTV6110_CTRL1] |=
267 ((((priv->mclk / 1000000) - 16) & 0x1f) << 3);
269 /* BB_GAIN = db/2 */
270 if (fe->ops.set_property && fe->ops.get_property) {
271 srate = c->symbol_rate;
272 dprintk("%s: Get Frontend parameters: srate=%d\n",
273 __func__, srate);
274 } else
275 srate = 15000000;
277 priv->regs[RSTV6110_CTRL2] &= ~0x0f;
278 priv->regs[RSTV6110_CTRL2] |= (priv->gain & 0x0f);
280 if (frequency <= 1023000) {
281 p = 1;
282 presc = 0;
283 } else if (frequency <= 1300000) {
284 p = 1;
285 presc = 1;
286 } else if (frequency <= 2046000) {
287 p = 0;
288 presc = 0;
289 } else {
290 p = 0;
291 presc = 1;
293 /* DIV4SEL = p*/
294 priv->regs[RSTV6110_TUNING2] &= ~(1 << 4);
295 priv->regs[RSTV6110_TUNING2] |= (p << 4);
297 /* PRESC32ON = presc */
298 priv->regs[RSTV6110_TUNING2] &= ~(1 << 5);
299 priv->regs[RSTV6110_TUNING2] |= (presc << 5);
301 p_val = (int)(1 << (p + 1)) * 10;/* P = 2 or P = 4 */
302 for (r_div = 0; r_div <= 3; r_div++) {
303 p_calc = (priv->mclk / 100000);
304 p_calc /= (1 << (r_div + 1));
305 if ((abssub(p_calc, p_val)) < (abssub(p_calc_opt, p_val)))
306 r_div_opt = r_div;
308 p_calc_opt = (priv->mclk / 100000);
309 p_calc_opt /= (1 << (r_div_opt + 1));
312 ref = priv->mclk / ((1 << (r_div_opt + 1)) * (1 << (p + 1)));
313 divider = (((frequency * 1000) + (ref >> 1)) / ref);
315 /* RDIV = r_div_opt */
316 priv->regs[RSTV6110_TUNING2] &= ~(3 << 6);
317 priv->regs[RSTV6110_TUNING2] |= (((r_div_opt) & 3) << 6);
319 /* NDIV_MSB = MSB(divider) */
320 priv->regs[RSTV6110_TUNING2] &= ~0x0f;
321 priv->regs[RSTV6110_TUNING2] |= (((divider) >> 8) & 0x0f);
323 /* NDIV_LSB, LSB(divider) */
324 priv->regs[RSTV6110_TUNING1] = (divider & 0xff);
326 /* CALVCOSTRT = 1 VCO Auto Calibration */
327 priv->regs[RSTV6110_STAT1] |= 0x04;
328 stv6110_write_regs(fe, &priv->regs[RSTV6110_CTRL1],
329 RSTV6110_CTRL1, 8);
331 i = 0;
332 /* Wait for CALVCOSTRT == 0 */
333 while ((i < 10) && (ret != 0)) {
334 ret = ((stv6110_read_reg(fe, RSTV6110_STAT1)) & 0x04);
335 msleep(1); /* wait for VCO auto calibration */
336 i++;
339 ret = stv6110_read_reg(fe, RSTV6110_STAT1);
340 stv6110_get_frequency(fe, &result_freq);
342 vco_freq = divider * ((priv->mclk / 1000) / ((1 << (r_div_opt + 1))));
343 dprintk("%s, stat1=%x, lo_freq=%d kHz, vco_frec=%d kHz\n", __func__,
344 ret, result_freq, vco_freq);
346 return 0;
349 static int stv6110_set_params(struct dvb_frontend *fe,
350 struct dvb_frontend_parameters *params)
352 struct dtv_frontend_properties *c = &fe->dtv_property_cache;
353 u32 bandwidth = carrier_width(c->symbol_rate, c->rolloff);
355 stv6110_set_frequency(fe, c->frequency);
356 stv6110_set_bandwidth(fe, bandwidth);
358 return 0;
361 static int stv6110_get_bandwidth(struct dvb_frontend *fe, u32 *bandwidth)
363 struct stv6110_priv *priv = fe->tuner_priv;
364 u8 r8 = 0;
365 u8 regs[] = { 0, 0, 0, 0, 0, 0, 0, 0 };
366 stv6110_read_regs(fe, regs, 0, 8);
368 /* CF */
369 r8 = priv->regs[RSTV6110_CTRL3] & 0x1f;
370 *bandwidth = (r8 + 5) * 2000000;/* x2 for ZIF tuner BW/2 = F+5 Mhz */
372 return 0;
375 static struct dvb_tuner_ops stv6110_tuner_ops = {
376 .info = {
377 .name = "ST STV6110",
378 .frequency_min = 950000,
379 .frequency_max = 2150000,
380 .frequency_step = 1000,
382 .init = stv6110_init,
383 .release = stv6110_release,
384 .sleep = stv6110_sleep,
385 .set_params = stv6110_set_params,
386 .get_frequency = stv6110_get_frequency,
387 .set_frequency = stv6110_set_frequency,
388 .get_bandwidth = stv6110_get_bandwidth,
389 .set_bandwidth = stv6110_set_bandwidth,
393 struct dvb_frontend *stv6110_attach(struct dvb_frontend *fe,
394 const struct stv6110_config *config,
395 struct i2c_adapter *i2c)
397 struct stv6110_priv *priv = NULL;
398 u8 reg0[] = { 0x00, 0x07, 0x11, 0xdc, 0x85, 0x17, 0x01, 0xe6, 0x1e };
400 struct i2c_msg msg[] = {
402 .addr = config->i2c_address,
403 .flags = 0,
404 .buf = reg0,
405 .len = 9
408 int ret;
410 /* divisor value for the output clock */
411 reg0[2] &= ~0xc0;
412 reg0[2] |= (config->clk_div << 6);
414 if (fe->ops.i2c_gate_ctrl)
415 fe->ops.i2c_gate_ctrl(fe, 1);
417 ret = i2c_transfer(i2c, msg, 1);
419 if (fe->ops.i2c_gate_ctrl)
420 fe->ops.i2c_gate_ctrl(fe, 0);
422 if (ret != 1)
423 return NULL;
425 priv = kzalloc(sizeof(struct stv6110_priv), GFP_KERNEL);
426 if (priv == NULL)
427 return NULL;
429 priv->i2c_address = config->i2c_address;
430 priv->i2c = i2c;
431 priv->mclk = config->mclk;
432 priv->clk_div = config->clk_div;
433 priv->gain = config->gain;
435 memcpy(&priv->regs, &reg0[1], 8);
437 memcpy(&fe->ops.tuner_ops, &stv6110_tuner_ops,
438 sizeof(struct dvb_tuner_ops));
439 fe->tuner_priv = priv;
440 printk(KERN_INFO "STV6110 attached on addr=%x!\n", priv->i2c_address);
442 return fe;
444 EXPORT_SYMBOL(stv6110_attach);
446 module_param(debug, int, 0644);
447 MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
449 MODULE_DESCRIPTION("ST STV6110 driver");
450 MODULE_AUTHOR("Igor M. Liplianin");
451 MODULE_LICENSE("GPL");