2 Driver for the Spase sp887x demodulator
6 * This driver needs external firmware. Please use the command
7 * "<kerneldir>/Documentation/dvb/get_dvb_firmware sp887x" to
8 * download/extract it, and then copy it to /usr/lib/hotplug/firmware
9 * or /lib/firmware (depending on configuration of firmware hotplug).
11 #define SP887X_DEFAULT_FIRMWARE "dvb-fe-sp887x.fw"
13 #include <linux/init.h>
14 #include <linux/module.h>
15 #include <linux/moduleparam.h>
16 #include <linux/device.h>
17 #include <linux/firmware.h>
18 #include <linux/string.h>
19 #include <linux/slab.h>
21 #include "dvb_frontend.h"
26 struct i2c_adapter* i2c;
27 const struct sp887x_config* config;
28 struct dvb_frontend frontend;
30 /* demodulator private data */
35 #define dprintk(args...) \
37 if (debug) printk(KERN_DEBUG "sp887x: " args); \
40 static int i2c_writebytes (struct sp887x_state* state, u8 *buf, u8 len)
42 struct i2c_msg msg = { .addr = state->config->demod_address, .flags = 0, .buf = buf, .len = len };
45 if ((err = i2c_transfer (state->i2c, &msg, 1)) != 1) {
46 printk ("%s: i2c write error (addr %02x, err == %i)\n",
47 __FUNCTION__, state->config->demod_address, err);
54 static int sp887x_writereg (struct sp887x_state* state, u16 reg, u16 data)
56 u8 b0 [] = { reg >> 8 , reg & 0xff, data >> 8, data & 0xff };
57 struct i2c_msg msg = { .addr = state->config->demod_address, .flags = 0, .buf = b0, .len = 4 };
60 if ((ret = i2c_transfer(state->i2c, &msg, 1)) != 1) {
62 * in case of soft reset we ignore ACK errors...
64 if (!(reg == 0xf1a && data == 0x000 &&
65 (ret == -EREMOTEIO || ret == -EFAULT)))
67 printk("%s: writereg error "
68 "(reg %03x, data %03x, ret == %i)\n",
69 __FUNCTION__, reg & 0xffff, data & 0xffff, ret);
77 static int sp887x_readreg (struct sp887x_state* state, u16 reg)
79 u8 b0 [] = { reg >> 8 , reg & 0xff };
82 struct i2c_msg msg[] = {{ .addr = state->config->demod_address, .flags = 0, .buf = b0, .len = 2 },
83 { .addr = state->config->demod_address, .flags = I2C_M_RD, .buf = b1, .len = 2 }};
85 if ((ret = i2c_transfer(state->i2c, msg, 2)) != 2) {
86 printk("%s: readreg error (ret == %i)\n", __FUNCTION__, ret);
90 return (((b1[0] << 8) | b1[1]) & 0xfff);
93 static void sp887x_microcontroller_stop (struct sp887x_state* state)
95 dprintk("%s\n", __FUNCTION__);
96 sp887x_writereg(state, 0xf08, 0x000);
97 sp887x_writereg(state, 0xf09, 0x000);
99 /* microcontroller STOP */
100 sp887x_writereg(state, 0xf00, 0x000);
103 static void sp887x_microcontroller_start (struct sp887x_state* state)
105 dprintk("%s\n", __FUNCTION__);
106 sp887x_writereg(state, 0xf08, 0x000);
107 sp887x_writereg(state, 0xf09, 0x000);
109 /* microcontroller START */
110 sp887x_writereg(state, 0xf00, 0x001);
113 static void sp887x_setup_agc (struct sp887x_state* state)
115 /* setup AGC parameters */
116 dprintk("%s\n", __FUNCTION__);
117 sp887x_writereg(state, 0x33c, 0x054);
118 sp887x_writereg(state, 0x33b, 0x04c);
119 sp887x_writereg(state, 0x328, 0x000);
120 sp887x_writereg(state, 0x327, 0x005);
121 sp887x_writereg(state, 0x326, 0x001);
122 sp887x_writereg(state, 0x325, 0x001);
123 sp887x_writereg(state, 0x324, 0x001);
124 sp887x_writereg(state, 0x318, 0x050);
125 sp887x_writereg(state, 0x317, 0x3fe);
126 sp887x_writereg(state, 0x316, 0x001);
127 sp887x_writereg(state, 0x313, 0x005);
128 sp887x_writereg(state, 0x312, 0x002);
129 sp887x_writereg(state, 0x306, 0x000);
130 sp887x_writereg(state, 0x303, 0x000);
134 #define FW_SIZE 0x4000
136 * load firmware and setup MPEG interface...
138 static int sp887x_initial_setup (struct dvb_frontend* fe, const struct firmware *fw)
140 struct sp887x_state* state = fe->demodulator_priv;
141 u8 buf [BLOCKSIZE+2];
143 int fw_size = fw->size;
144 unsigned char *mem = fw->data;
146 dprintk("%s\n", __FUNCTION__);
148 /* ignore the first 10 bytes, then we expect 0x4000 bytes of firmware */
149 if (fw_size < FW_SIZE+10)
155 sp887x_writereg(state, 0xf1a, 0x000);
157 sp887x_microcontroller_stop (state);
159 printk ("%s: firmware upload... ", __FUNCTION__);
161 /* setup write pointer to -1 (end of memory) */
162 /* bit 0x8000 in address is set to enable 13bit mode */
163 sp887x_writereg(state, 0x8f08, 0x1fff);
165 /* dummy write (wrap around to start of memory) */
166 sp887x_writereg(state, 0x8f0a, 0x0000);
168 for (i = 0; i < FW_SIZE; i += BLOCKSIZE) {
175 /* bit 0x8000 in address is set to enable 13bit mode */
176 /* bit 0x4000 enables multibyte read/write transfers */
177 /* write register is 0xf0a */
181 memcpy(&buf[2], mem + i, c);
183 if ((err = i2c_writebytes (state, buf, c+2)) < 0) {
184 printk ("failed.\n");
185 printk ("%s: i2c error (err == %i)\n", __FUNCTION__, err);
190 /* don't write RS bytes between packets */
191 sp887x_writereg(state, 0xc13, 0x001);
193 /* suppress clock if (!data_valid) */
194 sp887x_writereg(state, 0xc14, 0x000);
196 /* setup MPEG interface... */
197 sp887x_writereg(state, 0xc1a, 0x872);
198 sp887x_writereg(state, 0xc1b, 0x001);
199 sp887x_writereg(state, 0xc1c, 0x000); /* parallel mode (serial mode == 1) */
200 sp887x_writereg(state, 0xc1a, 0x871);
202 /* ADC mode, 2 for MT8872, 3 for SP8870/SP8871 */
203 sp887x_writereg(state, 0x301, 0x002);
205 sp887x_setup_agc(state);
207 /* bit 0x010: enable data valid signal */
208 sp887x_writereg(state, 0xd00, 0x010);
209 sp887x_writereg(state, 0x0d1, 0x000);
213 static int configure_reg0xc05 (struct dvb_frontend_parameters *p, u16 *reg0xc05)
215 int known_parameters = 1;
219 switch (p->u.ofdm.constellation) {
223 *reg0xc05 |= (1 << 10);
226 *reg0xc05 |= (2 << 10);
229 known_parameters = 0;
235 switch (p->u.ofdm.hierarchy_information) {
239 *reg0xc05 |= (1 << 7);
242 *reg0xc05 |= (2 << 7);
245 *reg0xc05 |= (3 << 7);
248 known_parameters = 0;
254 switch (p->u.ofdm.code_rate_HP) {
258 *reg0xc05 |= (1 << 3);
261 *reg0xc05 |= (2 << 3);
264 *reg0xc05 |= (3 << 3);
267 *reg0xc05 |= (4 << 3);
270 known_parameters = 0;
276 if (known_parameters)
277 *reg0xc05 |= (2 << 1); /* use specified parameters */
279 *reg0xc05 |= (1 << 1); /* enable autoprobing */
285 * estimates division of two 24bit numbers,
286 * derived from the ves1820/stv0299 driver code
288 static void divide (int n, int d, int *quotient_i, int *quotient_f)
300 q = (q << 8) | (r / d);
302 *quotient_f = (q << 8) | (r / d);
306 static void sp887x_correct_offsets (struct sp887x_state* state,
307 struct dvb_frontend_parameters *p,
310 static const u32 srate_correction [] = { 1879617, 4544878, 8098561 };
311 int bw_index = p->u.ofdm.bandwidth - BANDWIDTH_8_MHZ;
312 int freq_offset = actual_freq - p->frequency;
313 int sysclock = 61003; //[kHz]
314 int ifreq = 36000000;
318 if (p->inversion == INVERSION_ON)
319 freq = ifreq - freq_offset;
321 freq = ifreq + freq_offset;
323 divide(freq / 333, sysclock, NULL, &frequency_shift);
325 if (p->inversion == INVERSION_ON)
326 frequency_shift = -frequency_shift;
328 /* sample rate correction */
329 sp887x_writereg(state, 0x319, srate_correction[bw_index] >> 12);
330 sp887x_writereg(state, 0x31a, srate_correction[bw_index] & 0xfff);
332 /* carrier offset correction */
333 sp887x_writereg(state, 0x309, frequency_shift >> 12);
334 sp887x_writereg(state, 0x30a, frequency_shift & 0xfff);
337 static int sp887x_setup_frontend_parameters (struct dvb_frontend* fe,
338 struct dvb_frontend_parameters *p)
340 struct sp887x_state* state = fe->demodulator_priv;
341 int actual_freq, err;
344 if (p->u.ofdm.bandwidth != BANDWIDTH_8_MHZ &&
345 p->u.ofdm.bandwidth != BANDWIDTH_7_MHZ &&
346 p->u.ofdm.bandwidth != BANDWIDTH_6_MHZ)
349 if ((err = configure_reg0xc05(p, ®0xc05)))
352 sp887x_microcontroller_stop(state);
355 if (fe->ops.tuner_ops.set_params) {
356 fe->ops.tuner_ops.set_params(fe, p);
357 if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0);
359 if (fe->ops.tuner_ops.get_frequency) {
360 fe->ops.tuner_ops.get_frequency(fe, &actual_freq);
361 if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0);
363 actual_freq = p->frequency;
366 /* read status reg in order to clear <pending irqs */
367 sp887x_readreg(state, 0x200);
369 sp887x_correct_offsets(state, p, actual_freq);
371 /* filter for 6/7/8 Mhz channel */
372 if (p->u.ofdm.bandwidth == BANDWIDTH_6_MHZ)
374 else if (p->u.ofdm.bandwidth == BANDWIDTH_7_MHZ)
379 sp887x_writereg(state, 0x311, val);
381 /* scan order: 2k first = 0, 8k first = 1 */
382 if (p->u.ofdm.transmission_mode == TRANSMISSION_MODE_2K)
383 sp887x_writereg(state, 0x338, 0x000);
385 sp887x_writereg(state, 0x338, 0x001);
387 sp887x_writereg(state, 0xc05, reg0xc05);
389 if (p->u.ofdm.bandwidth == BANDWIDTH_6_MHZ)
391 else if (p->u.ofdm.bandwidth == BANDWIDTH_7_MHZ)
396 /* enable OFDM and SAW bits as lock indicators in sync register 0xf17,
397 * optimize algorithm for given bandwidth...
399 sp887x_writereg(state, 0xf14, 0x160 | val);
400 sp887x_writereg(state, 0xf15, 0x000);
402 sp887x_microcontroller_start(state);
406 static int sp887x_read_status(struct dvb_frontend* fe, fe_status_t* status)
408 struct sp887x_state* state = fe->demodulator_priv;
409 u16 snr12 = sp887x_readreg(state, 0xf16);
410 u16 sync0x200 = sp887x_readreg(state, 0x200);
411 u16 sync0xf17 = sp887x_readreg(state, 0xf17);
416 *status |= FE_HAS_SIGNAL;
418 //if (sync0x200 & 0x004)
419 // *status |= FE_HAS_SYNC | FE_HAS_CARRIER;
421 //if (sync0x200 & 0x008)
422 // *status |= FE_HAS_VITERBI;
424 if ((sync0xf17 & 0x00f) == 0x002) {
425 *status |= FE_HAS_LOCK;
426 *status |= FE_HAS_VITERBI | FE_HAS_SYNC | FE_HAS_CARRIER;
429 if (sync0x200 & 0x001) { /* tuner adjustment requested...*/
430 int steps = (sync0x200 >> 4) & 0x00f;
433 dprintk("sp887x: implement tuner adjustment (%+i steps)!!\n",
440 static int sp887x_read_ber(struct dvb_frontend* fe, u32* ber)
442 struct sp887x_state* state = fe->demodulator_priv;
444 *ber = (sp887x_readreg(state, 0xc08) & 0x3f) |
445 (sp887x_readreg(state, 0xc07) << 6);
446 sp887x_writereg(state, 0xc08, 0x000);
447 sp887x_writereg(state, 0xc07, 0x000);
454 static int sp887x_read_signal_strength(struct dvb_frontend* fe, u16* strength)
456 struct sp887x_state* state = fe->demodulator_priv;
458 u16 snr12 = sp887x_readreg(state, 0xf16);
459 u32 signal = 3 * (snr12 << 4);
460 *strength = (signal < 0xffff) ? signal : 0xffff;
465 static int sp887x_read_snr(struct dvb_frontend* fe, u16* snr)
467 struct sp887x_state* state = fe->demodulator_priv;
469 u16 snr12 = sp887x_readreg(state, 0xf16);
470 *snr = (snr12 << 4) | (snr12 >> 8);
475 static int sp887x_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
477 struct sp887x_state* state = fe->demodulator_priv;
479 *ucblocks = sp887x_readreg(state, 0xc0c);
480 if (*ucblocks == 0xfff)
486 static int sp887x_i2c_gate_ctrl(struct dvb_frontend* fe, int enable)
488 struct sp887x_state* state = fe->demodulator_priv;
491 return sp887x_writereg(state, 0x206, 0x001);
493 return sp887x_writereg(state, 0x206, 0x000);
497 static int sp887x_sleep(struct dvb_frontend* fe)
499 struct sp887x_state* state = fe->demodulator_priv;
501 /* tristate TS output and disable interface pins */
502 sp887x_writereg(state, 0xc18, 0x000);
507 static int sp887x_init(struct dvb_frontend* fe)
509 struct sp887x_state* state = fe->demodulator_priv;
510 const struct firmware *fw = NULL;
513 if (!state->initialised) {
514 /* request the firmware, this will block until someone uploads it */
515 printk("sp887x: waiting for firmware upload (%s)...\n", SP887X_DEFAULT_FIRMWARE);
516 ret = state->config->request_firmware(fe, &fw, SP887X_DEFAULT_FIRMWARE);
518 printk("sp887x: no firmware upload (timeout or file not found?)\n");
522 ret = sp887x_initial_setup(fe, fw);
523 release_firmware(fw);
525 printk("sp887x: writing firmware to device failed\n");
528 printk("sp887x: firmware upload complete\n");
529 state->initialised = 1;
532 /* enable TS output and interface pins */
533 sp887x_writereg(state, 0xc18, 0x00d);
538 static int sp887x_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings* fesettings)
540 fesettings->min_delay_ms = 350;
541 fesettings->step_size = 166666*2;
542 fesettings->max_drift = (166666*2)+1;
546 static void sp887x_release(struct dvb_frontend* fe)
548 struct sp887x_state* state = fe->demodulator_priv;
552 static struct dvb_frontend_ops sp887x_ops;
554 struct dvb_frontend* sp887x_attach(const struct sp887x_config* config,
555 struct i2c_adapter* i2c)
557 struct sp887x_state* state = NULL;
559 /* allocate memory for the internal state */
560 state = kmalloc(sizeof(struct sp887x_state), GFP_KERNEL);
561 if (state == NULL) goto error;
563 /* setup the state */
564 state->config = config;
566 state->initialised = 0;
568 /* check if the demod is there */
569 if (sp887x_readreg(state, 0x0200) < 0) goto error;
571 /* create dvb_frontend */
572 memcpy(&state->frontend.ops, &sp887x_ops, sizeof(struct dvb_frontend_ops));
573 state->frontend.demodulator_priv = state;
574 return &state->frontend;
581 static struct dvb_frontend_ops sp887x_ops = {
584 .name = "Spase SP887x DVB-T",
586 .frequency_min = 50500000,
587 .frequency_max = 858000000,
588 .frequency_stepsize = 166666,
589 .caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
590 FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
591 FE_CAN_QPSK | FE_CAN_QAM_16 | FE_CAN_QAM_64 |
595 .release = sp887x_release,
598 .sleep = sp887x_sleep,
599 .i2c_gate_ctrl = sp887x_i2c_gate_ctrl,
601 .set_frontend = sp887x_setup_frontend_parameters,
602 .get_tune_settings = sp887x_get_tune_settings,
604 .read_status = sp887x_read_status,
605 .read_ber = sp887x_read_ber,
606 .read_signal_strength = sp887x_read_signal_strength,
607 .read_snr = sp887x_read_snr,
608 .read_ucblocks = sp887x_read_ucblocks,
611 module_param(debug, int, 0644);
612 MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
614 MODULE_DESCRIPTION("Spase sp887x DVB-T demodulator driver");
615 MODULE_LICENSE("GPL");
617 EXPORT_SYMBOL(sp887x_attach);