2 * Driver for Maxim MAX2165 silicon tuner
4 * Copyright (c) 2009 David T. L. Wong <davidtlwong@gmail.com>
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.
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
15 * GNU General Public License for more details.
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.
22 #include <linux/module.h>
23 #include <linux/moduleparam.h>
24 #include <linux/videodev2.h>
25 #include <linux/delay.h>
26 #include <linux/dvb/frontend.h>
27 #include <linux/i2c.h>
28 #include <linux/slab.h>
30 #include "dvb_frontend.h"
33 #include "max2165_priv.h"
34 #include "tuner-i2c.h"
36 #define dprintk(args...) \
39 printk(KERN_DEBUG "max2165: " args); \
43 module_param(debug, int, 0644);
44 MODULE_PARM_DESC(debug, "Turn on/off debugging (default:off).");
46 static int max2165_write_reg(struct max2165_priv *priv, u8 reg, u8 data)
49 u8 buf[] = { reg, data };
50 struct i2c_msg msg = { .flags = 0, .buf = buf, .len = 2 };
52 msg.addr = priv->config->i2c_address;
55 dprintk("%s: reg=0x%02X, data=0x%02X\n", __func__, reg, data);
57 ret = i2c_transfer(priv->i2c, &msg, 1);
60 dprintk("%s: error reg=0x%x, data=0x%x, ret=%i\n",
61 __func__, reg, data, ret);
63 return (ret != 1) ? -EIO : 0;
66 static int max2165_read_reg(struct max2165_priv *priv, u8 reg, u8 *p_data)
69 u8 dev_addr = priv->config->i2c_address;
73 struct i2c_msg msg[] = {
74 { .addr = dev_addr, .flags = 0, .buf = b0, .len = 1 },
75 { .addr = dev_addr, .flags = I2C_M_RD, .buf = b1, .len = 1 },
78 ret = i2c_transfer(priv->i2c, msg, 2);
80 dprintk("%s: error reg=0x%x, ret=%i\n", __func__, reg, ret);
86 dprintk("%s: reg=0x%02X, data=0x%02X\n",
87 __func__, reg, b1[0]);
91 static int max2165_mask_write_reg(struct max2165_priv *priv, u8 reg,
98 ret = max2165_read_reg(priv, reg, &v);
103 ret = max2165_write_reg(priv, reg, v);
108 static int max2165_read_rom_table(struct max2165_priv *priv)
113 for (i = 0; i < 3; i++) {
114 max2165_write_reg(priv, REG_ROM_TABLE_ADDR, i + 1);
115 max2165_read_reg(priv, REG_ROM_TABLE_DATA, &dat[i]);
118 priv->tf_ntch_low_cfg = dat[0] >> 4;
119 priv->tf_ntch_hi_cfg = dat[0] & 0x0F;
120 priv->tf_balun_low_ref = dat[1] & 0x0F;
121 priv->tf_balun_hi_ref = dat[1] >> 4;
122 priv->bb_filter_7mhz_cfg = dat[2] & 0x0F;
123 priv->bb_filter_8mhz_cfg = dat[2] >> 4;
125 dprintk("tf_ntch_low_cfg = 0x%X\n", priv->tf_ntch_low_cfg);
126 dprintk("tf_ntch_hi_cfg = 0x%X\n", priv->tf_ntch_hi_cfg);
127 dprintk("tf_balun_low_ref = 0x%X\n", priv->tf_balun_low_ref);
128 dprintk("tf_balun_hi_ref = 0x%X\n", priv->tf_balun_hi_ref);
129 dprintk("bb_filter_7mhz_cfg = 0x%X\n", priv->bb_filter_7mhz_cfg);
130 dprintk("bb_filter_8mhz_cfg = 0x%X\n", priv->bb_filter_8mhz_cfg);
135 static int max2165_set_osc(struct max2165_priv *priv, u8 osc /*MHz*/)
145 max2165_mask_write_reg(priv, REG_PLL_CFG, 0x07, v);
150 static int max2165_set_bandwidth(struct max2165_priv *priv, u32 bw)
155 val = priv->bb_filter_8mhz_cfg;
157 val = priv->bb_filter_7mhz_cfg;
159 max2165_mask_write_reg(priv, REG_BASEBAND_CTRL, 0xF0, val << 4);
164 static int fixpt_div32(u32 dividend, u32 divisor, u32 *quotient, u32 *fraction)
173 q = dividend / divisor;
174 remainder = dividend - q * divisor;
176 for (i = 0; i < 31; i++) {
178 if (remainder >= divisor) {
180 remainder -= divisor;
191 static int max2165_set_rf(struct max2165_priv *priv, u32 freq)
196 u32 quotient, fraction;
199 /* Set PLL divider according to RF frequency */
200 ret = fixpt_div32(freq / 1000, priv->config->osc_clk * 1000,
201 "ient, &fraction);
205 /* 20-bit fraction */
208 max2165_write_reg(priv, REG_NDIV_INT, quotient);
209 max2165_mask_write_reg(priv, REG_NDIV_FRAC2, 0x0F, fraction >> 16);
210 max2165_write_reg(priv, REG_NDIV_FRAC1, fraction >> 8);
211 max2165_write_reg(priv, REG_NDIV_FRAC0, fraction);
214 tf_ntch = (freq < 725000000) ?
215 priv->tf_ntch_low_cfg : priv->tf_ntch_hi_cfg;
217 /* Tracking filter balun */
218 t = priv->tf_balun_low_ref;
219 t += (priv->tf_balun_hi_ref - priv->tf_balun_low_ref)
220 * (freq / 1000 - 470000) / (780000 - 470000);
223 dprintk("tf = %X\n", tf);
226 max2165_write_reg(priv, REG_TRACK_FILTER, tf);
231 static void max2165_debug_status(struct max2165_priv *priv)
234 u8 auto_vco_success, auto_vco_active;
236 u8 dc_offset_low, dc_offset_hi;
237 u8 signal_lv_over_threshold;
238 u8 vco, vco_sub_band, adc;
240 max2165_read_reg(priv, REG_STATUS, &status);
241 max2165_read_reg(priv, REG_AUTOTUNE, &autotune);
243 auto_vco_success = (status >> 6) & 0x01;
244 auto_vco_active = (status >> 5) & 0x01;
245 pll_locked = (status >> 4) & 0x01;
246 dc_offset_low = (status >> 3) & 0x01;
247 dc_offset_hi = (status >> 2) & 0x01;
248 signal_lv_over_threshold = status & 0x01;
251 vco_sub_band = (autotune >> 3) & 0x7;
252 adc = autotune & 0x7;
254 dprintk("auto VCO active: %d, auto VCO success: %d\n",
255 auto_vco_active, auto_vco_success);
256 dprintk("PLL locked: %d\n", pll_locked);
257 dprintk("DC offset low: %d, DC offset high: %d\n",
258 dc_offset_low, dc_offset_hi);
259 dprintk("Signal lvl over threshold: %d\n", signal_lv_over_threshold);
260 dprintk("VCO: %d, VCO Sub-band: %d, ADC: %d\n", vco, vco_sub_band, adc);
263 static int max2165_set_params(struct dvb_frontend *fe)
265 struct max2165_priv *priv = fe->tuner_priv;
266 struct dtv_frontend_properties *c = &fe->dtv_property_cache;
269 switch (c->bandwidth_hz) {
272 priv->frequency = c->frequency;
275 printk(KERN_INFO "MAX2165: bandwidth %d Hz not supported.\n",
280 dprintk("%s() frequency=%d\n", __func__, c->frequency);
282 if (fe->ops.i2c_gate_ctrl)
283 fe->ops.i2c_gate_ctrl(fe, 1);
284 max2165_set_bandwidth(priv, c->bandwidth_hz);
285 ret = max2165_set_rf(priv, priv->frequency);
287 max2165_debug_status(priv);
288 if (fe->ops.i2c_gate_ctrl)
289 fe->ops.i2c_gate_ctrl(fe, 0);
297 static int max2165_get_frequency(struct dvb_frontend *fe, u32 *freq)
299 struct max2165_priv *priv = fe->tuner_priv;
300 dprintk("%s()\n", __func__);
301 *freq = priv->frequency;
305 static int max2165_get_bandwidth(struct dvb_frontend *fe, u32 *bw)
307 struct max2165_priv *priv = fe->tuner_priv;
308 dprintk("%s()\n", __func__);
310 *bw = priv->bandwidth;
314 static int max2165_get_status(struct dvb_frontend *fe, u32 *status)
316 struct max2165_priv *priv = fe->tuner_priv;
319 dprintk("%s()\n", __func__);
321 if (fe->ops.i2c_gate_ctrl)
322 fe->ops.i2c_gate_ctrl(fe, 1);
324 max2165_debug_status(priv);
325 *status = lock_status;
327 if (fe->ops.i2c_gate_ctrl)
328 fe->ops.i2c_gate_ctrl(fe, 0);
333 static int max2165_sleep(struct dvb_frontend *fe)
335 dprintk("%s()\n", __func__);
339 static int max2165_init(struct dvb_frontend *fe)
341 struct max2165_priv *priv = fe->tuner_priv;
342 dprintk("%s()\n", __func__);
344 if (fe->ops.i2c_gate_ctrl)
345 fe->ops.i2c_gate_ctrl(fe, 1);
347 /* Setup initial values */
348 /* Fractional Mode on */
349 max2165_write_reg(priv, REG_NDIV_FRAC2, 0x18);
351 max2165_write_reg(priv, REG_LNA, 0x01);
352 max2165_write_reg(priv, REG_PLL_CFG, 0x7A);
353 max2165_write_reg(priv, REG_TEST, 0x08);
354 max2165_write_reg(priv, REG_SHUTDOWN, 0x40);
355 max2165_write_reg(priv, REG_VCO_CTRL, 0x84);
356 max2165_write_reg(priv, REG_BASEBAND_CTRL, 0xC3);
357 max2165_write_reg(priv, REG_DC_OFFSET_CTRL, 0x75);
358 max2165_write_reg(priv, REG_DC_OFFSET_DAC, 0x00);
359 max2165_write_reg(priv, REG_ROM_TABLE_ADDR, 0x00);
361 max2165_set_osc(priv, priv->config->osc_clk);
363 max2165_read_rom_table(priv);
365 max2165_set_bandwidth(priv, 8000000);
367 if (fe->ops.i2c_gate_ctrl)
368 fe->ops.i2c_gate_ctrl(fe, 0);
373 static int max2165_release(struct dvb_frontend *fe)
375 struct max2165_priv *priv = fe->tuner_priv;
376 dprintk("%s()\n", __func__);
379 fe->tuner_priv = NULL;
384 static const struct dvb_tuner_ops max2165_tuner_ops = {
386 .name = "Maxim MAX2165",
387 .frequency_min = 470000000,
388 .frequency_max = 780000000,
389 .frequency_step = 50000,
392 .release = max2165_release,
393 .init = max2165_init,
394 .sleep = max2165_sleep,
396 .set_params = max2165_set_params,
397 .set_analog_params = NULL,
398 .get_frequency = max2165_get_frequency,
399 .get_bandwidth = max2165_get_bandwidth,
400 .get_status = max2165_get_status
403 struct dvb_frontend *max2165_attach(struct dvb_frontend *fe,
404 struct i2c_adapter *i2c,
405 struct max2165_config *cfg)
407 struct max2165_priv *priv = NULL;
409 dprintk("%s(%d-%04x)\n", __func__,
410 i2c ? i2c_adapter_id(i2c) : -1,
411 cfg ? cfg->i2c_address : -1);
413 priv = kzalloc(sizeof(struct max2165_priv), GFP_KERNEL);
417 memcpy(&fe->ops.tuner_ops, &max2165_tuner_ops,
418 sizeof(struct dvb_tuner_ops));
422 fe->tuner_priv = priv;
425 max2165_debug_status(priv);
429 EXPORT_SYMBOL(max2165_attach);
431 MODULE_AUTHOR("David T. L. Wong <davidtlwong@gmail.com>");
432 MODULE_DESCRIPTION("Maxim MAX2165 silicon tuner driver");
433 MODULE_LICENSE("GPL");