2 * Driver for Freescale MC44S803 Low Power CMOS Broadband Tuner
4 * Copyright (c) 2009 Jochen Friedrich <jochen@scram.de>
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.
18 #include <linux/module.h>
19 #include <linux/delay.h>
20 #include <linux/dvb/frontend.h>
21 #include <linux/i2c.h>
22 #include <linux/slab.h>
24 #include "dvb_frontend.h"
27 #include "mc44s803_priv.h"
29 #define mc_printk(level, format, arg...) \
30 printk(level "mc44s803: " format , ## arg)
32 /* Writes a single register */
33 static int mc44s803_writereg(struct mc44s803_priv *priv, u32 val)
36 struct i2c_msg msg = {
37 .addr = priv->cfg->i2c_address, .flags = 0, .buf = buf, .len = 3
40 buf[0] = (val & 0xff0000) >> 16;
41 buf[1] = (val & 0xff00) >> 8;
42 buf[2] = (val & 0xff);
44 if (i2c_transfer(priv->i2c, &msg, 1) != 1) {
45 mc_printk(KERN_WARNING, "I2C write failed\n");
51 /* Reads a single register */
52 static int mc44s803_readreg(struct mc44s803_priv *priv, u8 reg, u32 *val)
57 struct i2c_msg msg[] = {
58 { .addr = priv->cfg->i2c_address, .flags = I2C_M_RD,
59 .buf = buf, .len = 3 },
62 wval = MC44S803_REG_SM(MC44S803_REG_DATAREG, MC44S803_ADDR) |
63 MC44S803_REG_SM(reg, MC44S803_D);
65 ret = mc44s803_writereg(priv, wval);
69 if (i2c_transfer(priv->i2c, msg, 1) != 1) {
70 mc_printk(KERN_WARNING, "I2C read failed\n");
74 *val = (buf[0] << 16) | (buf[1] << 8) | buf[2];
79 static void mc44s803_release(struct dvb_frontend *fe)
81 struct mc44s803_priv *priv = fe->tuner_priv;
83 fe->tuner_priv = NULL;
87 static int mc44s803_init(struct dvb_frontend *fe)
89 struct mc44s803_priv *priv = fe->tuner_priv;
93 if (fe->ops.i2c_gate_ctrl)
94 fe->ops.i2c_gate_ctrl(fe, 1);
97 val = MC44S803_REG_SM(MC44S803_REG_RESET, MC44S803_ADDR) |
98 MC44S803_REG_SM(1, MC44S803_RS);
100 err = mc44s803_writereg(priv, val);
104 val = MC44S803_REG_SM(MC44S803_REG_RESET, MC44S803_ADDR);
106 err = mc44s803_writereg(priv, val);
110 /* Power Up and Start Osc */
112 val = MC44S803_REG_SM(MC44S803_REG_REFOSC, MC44S803_ADDR) |
113 MC44S803_REG_SM(0xC0, MC44S803_REFOSC) |
114 MC44S803_REG_SM(1, MC44S803_OSCSEL);
116 err = mc44s803_writereg(priv, val);
120 val = MC44S803_REG_SM(MC44S803_REG_POWER, MC44S803_ADDR) |
121 MC44S803_REG_SM(0x200, MC44S803_POWER);
123 err = mc44s803_writereg(priv, val);
129 val = MC44S803_REG_SM(MC44S803_REG_REFOSC, MC44S803_ADDR) |
130 MC44S803_REG_SM(0x40, MC44S803_REFOSC) |
131 MC44S803_REG_SM(1, MC44S803_OSCSEL);
133 err = mc44s803_writereg(priv, val);
141 val = MC44S803_REG_SM(MC44S803_REG_MIXER, MC44S803_ADDR) |
142 MC44S803_REG_SM(1, MC44S803_TRI_STATE) |
143 MC44S803_REG_SM(0x7F, MC44S803_MIXER_RES);
145 err = mc44s803_writereg(priv, val);
149 /* Setup Cirquit Adjust */
151 val = MC44S803_REG_SM(MC44S803_REG_CIRCADJ, MC44S803_ADDR) |
152 MC44S803_REG_SM(1, MC44S803_G1) |
153 MC44S803_REG_SM(1, MC44S803_G3) |
154 MC44S803_REG_SM(0x3, MC44S803_CIRCADJ_RES) |
155 MC44S803_REG_SM(1, MC44S803_G6) |
156 MC44S803_REG_SM(priv->cfg->dig_out, MC44S803_S1) |
157 MC44S803_REG_SM(0x3, MC44S803_LP) |
158 MC44S803_REG_SM(1, MC44S803_CLRF) |
159 MC44S803_REG_SM(1, MC44S803_CLIF);
161 err = mc44s803_writereg(priv, val);
165 val = MC44S803_REG_SM(MC44S803_REG_CIRCADJ, MC44S803_ADDR) |
166 MC44S803_REG_SM(1, MC44S803_G1) |
167 MC44S803_REG_SM(1, MC44S803_G3) |
168 MC44S803_REG_SM(0x3, MC44S803_CIRCADJ_RES) |
169 MC44S803_REG_SM(1, MC44S803_G6) |
170 MC44S803_REG_SM(priv->cfg->dig_out, MC44S803_S1) |
171 MC44S803_REG_SM(0x3, MC44S803_LP);
173 err = mc44s803_writereg(priv, val);
179 val = MC44S803_REG_SM(MC44S803_REG_DIGTUNE, MC44S803_ADDR) |
180 MC44S803_REG_SM(3, MC44S803_XOD);
182 err = mc44s803_writereg(priv, val);
188 val = MC44S803_REG_SM(MC44S803_REG_LNAAGC, MC44S803_ADDR) |
189 MC44S803_REG_SM(1, MC44S803_AT1) |
190 MC44S803_REG_SM(1, MC44S803_AT2) |
191 MC44S803_REG_SM(1, MC44S803_AGC_AN_DIG) |
192 MC44S803_REG_SM(1, MC44S803_AGC_READ_EN) |
193 MC44S803_REG_SM(1, MC44S803_LNA0);
195 err = mc44s803_writereg(priv, val);
199 if (fe->ops.i2c_gate_ctrl)
200 fe->ops.i2c_gate_ctrl(fe, 0);
204 if (fe->ops.i2c_gate_ctrl)
205 fe->ops.i2c_gate_ctrl(fe, 0);
207 mc_printk(KERN_WARNING, "I/O Error\n");
211 static int mc44s803_set_params(struct dvb_frontend *fe)
213 struct mc44s803_priv *priv = fe->tuner_priv;
214 struct dtv_frontend_properties *c = &fe->dtv_property_cache;
215 u32 r1, r2, n1, n2, lo1, lo2, freq, val;
218 priv->frequency = c->frequency;
220 r1 = MC44S803_OSC / 1000000;
221 r2 = MC44S803_OSC / 100000;
223 n1 = (c->frequency + MC44S803_IF1 + 500000) / 1000000;
224 freq = MC44S803_OSC / r1 * n1;
225 lo1 = ((60 * n1) + (r1 / 2)) / r1;
226 freq = freq - c->frequency;
228 n2 = (freq - MC44S803_IF2 + 50000) / 100000;
229 lo2 = ((60 * n2) + (r2 / 2)) / r2;
231 if (fe->ops.i2c_gate_ctrl)
232 fe->ops.i2c_gate_ctrl(fe, 1);
234 val = MC44S803_REG_SM(MC44S803_REG_REFDIV, MC44S803_ADDR) |
235 MC44S803_REG_SM(r1-1, MC44S803_R1) |
236 MC44S803_REG_SM(r2-1, MC44S803_R2) |
237 MC44S803_REG_SM(1, MC44S803_REFBUF_EN);
239 err = mc44s803_writereg(priv, val);
243 val = MC44S803_REG_SM(MC44S803_REG_LO1, MC44S803_ADDR) |
244 MC44S803_REG_SM(n1-2, MC44S803_LO1);
246 err = mc44s803_writereg(priv, val);
250 val = MC44S803_REG_SM(MC44S803_REG_LO2, MC44S803_ADDR) |
251 MC44S803_REG_SM(n2-2, MC44S803_LO2);
253 err = mc44s803_writereg(priv, val);
257 val = MC44S803_REG_SM(MC44S803_REG_DIGTUNE, MC44S803_ADDR) |
258 MC44S803_REG_SM(1, MC44S803_DA) |
259 MC44S803_REG_SM(lo1, MC44S803_LO_REF) |
260 MC44S803_REG_SM(1, MC44S803_AT);
262 err = mc44s803_writereg(priv, val);
266 val = MC44S803_REG_SM(MC44S803_REG_DIGTUNE, MC44S803_ADDR) |
267 MC44S803_REG_SM(2, MC44S803_DA) |
268 MC44S803_REG_SM(lo2, MC44S803_LO_REF) |
269 MC44S803_REG_SM(1, MC44S803_AT);
271 err = mc44s803_writereg(priv, val);
275 if (fe->ops.i2c_gate_ctrl)
276 fe->ops.i2c_gate_ctrl(fe, 0);
281 if (fe->ops.i2c_gate_ctrl)
282 fe->ops.i2c_gate_ctrl(fe, 0);
284 mc_printk(KERN_WARNING, "I/O Error\n");
288 static int mc44s803_get_frequency(struct dvb_frontend *fe, u32 *frequency)
290 struct mc44s803_priv *priv = fe->tuner_priv;
291 *frequency = priv->frequency;
295 static int mc44s803_get_if_frequency(struct dvb_frontend *fe, u32 *frequency)
297 *frequency = MC44S803_IF2; /* 36.125 MHz */
301 static const struct dvb_tuner_ops mc44s803_tuner_ops = {
303 .name = "Freescale MC44S803",
304 .frequency_min = 48000000,
305 .frequency_max = 1000000000,
306 .frequency_step = 100000,
309 .release = mc44s803_release,
310 .init = mc44s803_init,
311 .set_params = mc44s803_set_params,
312 .get_frequency = mc44s803_get_frequency,
313 .get_if_frequency = mc44s803_get_if_frequency,
316 /* This functions tries to identify a MC44S803 tuner by reading the ID
317 register. This is hasty. */
318 struct dvb_frontend *mc44s803_attach(struct dvb_frontend *fe,
319 struct i2c_adapter *i2c, struct mc44s803_config *cfg)
321 struct mc44s803_priv *priv;
328 priv = kzalloc(sizeof(struct mc44s803_priv), GFP_KERNEL);
336 if (fe->ops.i2c_gate_ctrl)
337 fe->ops.i2c_gate_ctrl(fe, 1); /* open i2c_gate */
339 ret = mc44s803_readreg(priv, MC44S803_REG_ID, ®);
343 id = MC44S803_REG_MS(reg, MC44S803_ID);
346 mc_printk(KERN_ERR, "unsupported ID (%x should be 0x14)\n",
351 mc_printk(KERN_INFO, "successfully identified (ID = %x)\n", id);
352 memcpy(&fe->ops.tuner_ops, &mc44s803_tuner_ops,
353 sizeof(struct dvb_tuner_ops));
355 fe->tuner_priv = priv;
357 if (fe->ops.i2c_gate_ctrl)
358 fe->ops.i2c_gate_ctrl(fe, 0); /* close i2c_gate */
363 if (fe->ops.i2c_gate_ctrl)
364 fe->ops.i2c_gate_ctrl(fe, 0); /* close i2c_gate */
369 EXPORT_SYMBOL(mc44s803_attach);
371 MODULE_AUTHOR("Jochen Friedrich");
372 MODULE_DESCRIPTION("Freescale MC44S803 silicon tuner driver");
373 MODULE_LICENSE("GPL");