[PATCH 3/14] add new DVB-T frontend driver

From: Michael Hunold (LinuxTV.org CVS maintainer) <hunold@linuxtv.org>
To: linux-kernel@vger.kernel.org
Subject: [PATCH 3/14] add new DVB-T frontend driver
Date: Wed, 8 Oct 2003 15:28:48 +0200	[thread overview]
Message-ID: <1065619728592@convergence.de> (raw)
In-Reply-To: <10656197272107@convergence.de>

- [DVB] add new DVB-T frontend driver sp887x.c
diff -uNrwB --new-file xx-linux-2.6.0-test5/drivers/media/dvb/frontends/Makefile linux-2.6.0-test5/drivers/media/dvb/frontends/Makefile

--- xx-linux-2.6.0-test5/drivers/media/dvb/frontends/Makefile	2003-09-10 11:28:54.000000000 +0200
+++ linux-2.6.0-test5/drivers/media/dvb/frontends/Makefile	2003-09-09 09:24:21.000000000 +0200
@@ -15,3 +15,4 @@
 obj-$(CONFIG_DVB_MT312) += mt312.o
 obj-$(CONFIG_DVB_VES1820) += ves1820.o
 obj-$(CONFIG_DVB_TDA1004X) += tda1004x.o
+obj-$(CONFIG_DVB_SP887X) += sp887x.o
diff -uNrwB --new-file xx-linux-2.6.0-test5/drivers/media/dvb/frontends/sp887x.c linux-2.6.0-test5/drivers/media/dvb/frontends/sp887x.c
--- xx-linux-2.6.0-test5/drivers/media/dvb/frontends/sp887x.c	1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.0-test5/drivers/media/dvb/frontends/sp887x.c	2003-09-07 17:40:35.000000000 +0200
@@ -0,0 +1,610 @@
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/i2c.h>
+
+#include "dvb_frontend.h"
+#include "dvb_compat.h"
+
+
+#if 0
+#define dprintk(x...) printk(x)
+#else
+#define dprintk(x...)
+#endif
+
+#if 0
+#define LOG(dir,addr,buf,len) 					\
+	do {							\
+		int i;						\
+		printk("%s (%02x):", dir, addr & 0xff);		\
+		for (i=0; i<len; i++)				\
+			printk(" 0x%02x,", buf[i] & 0xff);	\
+		printk("\n");					\
+	} while (0)
+#else
+#define LOG(dir,addr,buf,len)
+#endif
+
+
+static
+struct dvb_frontend_info sp887x_info = {
+	.name = "Microtune MT7072DTF",
+	.type = FE_OFDM,
+	.frequency_min =  50500000,
+	.frequency_max = 858000000,
+	.frequency_stepsize = 166666,
+	.caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
+		FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
+		FE_CAN_QPSK | FE_CAN_QAM_16 | FE_CAN_QAM_64 | FE_CAN_RECOVER
+};
+
+
+
+static
+int i2c_writebytes (struct dvb_frontend *fe, u8 addr, u8 *buf, u8 len)
+{
+	struct dvb_i2c_bus *i2c = fe->i2c;
+	struct i2c_msg msg = { addr: addr, flags: 0, buf: buf, len: len };
+	int err;
+
+	LOG("i2c_writebytes", msg.addr, msg.buf, msg.len);
+
+	if ((err = i2c->xfer (i2c, &msg, 1)) != 1) {
+		printk ("%s: i2c write error (addr %02x, err == %i)\n",
+			__FUNCTION__, addr, err);
+		return -EREMOTEIO;
+	}
+
+	return 0;
+}
+
+
+
+static
+int sp887x_writereg (struct dvb_frontend *fe, u16 reg, u16 data)
+{
+	struct dvb_i2c_bus *i2c = fe->i2c;
+	u8 b0 [] = { reg >> 8 , reg & 0xff, data >> 8, data & 0xff };
+	struct i2c_msg msg = { .addr = 0x70, .flags = 0, .buf = b0, .len = 4 };
+	int ret;
+
+	LOG("sp887x_writereg", msg.addr, msg.buf, msg.len);
+
+	if ((ret = i2c->xfer(i2c, &msg, 1)) != 1) {
+		/**
+		 *  in case of soft reset we ignore ACK errors...
+		 */
+		if (!(reg == 0xf1a && data == 0x000 && 
+			(ret == -EREMOTEIO || ret == -EFAULT)))
+		{
+			printk("%s: writereg error "
+			       "(reg %03x, data %03x, ret == %i)\n",
+			       __FUNCTION__, reg & 0xffff, data & 0xffff, ret);
+			return ret;
+		}
+	}
+
+	return 0;
+}
+
+
+static
+u16 sp887x_readreg (struct dvb_frontend *fe, u16 reg)
+{
+	struct dvb_i2c_bus *i2c = fe->i2c;
+	u8 b0 [] = { reg >> 8 , reg & 0xff };
+	u8 b1 [2];
+	int ret;
+	struct i2c_msg msg[] = {{ .addr = 0x70, .flags = 0, .buf = b0, .len = 2 },
+		         { .addr = 0x70, .flags = I2C_M_RD, .buf = b1, .len = 2 }};
+
+	LOG("sp887x_readreg (w)", msg[0].addr, msg[0].buf, msg[0].len);
+	LOG("sp887x_readreg (r)", msg[1].addr, msg[1].buf, msg[1].len);
+
+	if ((ret = i2c->xfer(i2c, msg, 2)) != 2)
+		printk("%s: readreg error (ret == %i)\n", __FUNCTION__, ret);
+
+	return (((b1[0] << 8) | b1[1]) & 0xfff);
+}
+
+
+static
+void sp887x_microcontroller_stop (struct dvb_frontend *fe)
+{
+	sp887x_writereg(fe, 0xf08, 0x000);
+	sp887x_writereg(fe, 0xf09, 0x000);		
+
+	/* microcontroller STOP */
+	sp887x_writereg(fe, 0xf00, 0x000);
+}
+
+
+static
+void sp887x_microcontroller_start (struct dvb_frontend *fe)
+{
+	sp887x_writereg(fe, 0xf08, 0x000);
+	sp887x_writereg(fe, 0xf09, 0x000);		
+
+	/* microcontroller START */
+	sp887x_writereg(fe, 0xf00, 0x001);
+}
+
+
+static
+void sp887x_setup_agc (struct dvb_frontend *fe)
+{
+	/* setup AGC parameters */
+	sp887x_writereg(fe, 0x33c, 0x054);
+	sp887x_writereg(fe, 0x33b, 0x04c);
+	sp887x_writereg(fe, 0x328, 0x000);
+	sp887x_writereg(fe, 0x327, 0x005);
+	sp887x_writereg(fe, 0x326, 0x001);
+	sp887x_writereg(fe, 0x325, 0x001);
+	sp887x_writereg(fe, 0x324, 0x001);
+	sp887x_writereg(fe, 0x318, 0x050);
+	sp887x_writereg(fe, 0x317, 0x3fe);
+	sp887x_writereg(fe, 0x316, 0x001);
+	sp887x_writereg(fe, 0x313, 0x005);
+	sp887x_writereg(fe, 0x312, 0x002);
+	sp887x_writereg(fe, 0x306, 0x000);
+	sp887x_writereg(fe, 0x303, 0x000);
+}
+
+
+#include "sp887x_firm.h"
+
+#define BLOCKSIZE 30
+
+/**
+ *  load firmware and setup MPEG interface...
+ */
+static
+int sp887x_initial_setup (struct dvb_frontend *fe)
+{
+	u8 buf [BLOCKSIZE];
+	int i;
+
+	/* soft reset */
+	sp887x_writereg(fe, 0xf1a, 0x000);
+
+	sp887x_microcontroller_stop (fe);
+
+	printk ("%s: firmware upload... ", __FUNCTION__);
+
+	/* setup write pointer to -1 (end of memory) */
+	/* bit 0x8000 in address is set to enable 13bit mode */
+	sp887x_writereg(fe, 0x8f08, 0x1fff);
+
+	/* dummy write (wrap around to start of memory) */
+	sp887x_writereg(fe, 0x8f0a, 0x0000);
+
+	for (i=0; i<sizeof(sp887x_firm); i+=BLOCKSIZE) {
+		int c = BLOCKSIZE;
+		int err;
+
+		if (i+c > sizeof(sp887x_firm))
+			c = sizeof(sp887x_firm) - i;
+
+		/* bit 0x8000 in address is set to enable 13bit mode */
+		/* bit 0x4000 enables multibyte read/write transfers */
+		/* write register is 0xf0a */
+		buf[0] = 0xcf;
+		buf[1] = 0x0a;
+
+		memcpy(&buf[2], &sp887x_firm[i], c);
+
+		if ((err = i2c_writebytes (fe, 0x70, buf, c+2)) < 0) {
+			printk ("failed.\n");
+			printk ("%s: i2c error (err == %i)\n", __FUNCTION__, err);
+			return err;
+		}
+	}
+
+	/* don't write RS bytes between packets */
+	sp887x_writereg(fe, 0xc13, 0x001);
+
+	/* suppress clock if (!data_valid) */
+	sp887x_writereg(fe, 0xc14, 0x000);
+
+	/* setup MPEG interface... */
+	sp887x_writereg(fe, 0xc1a, 0x872);
+	sp887x_writereg(fe, 0xc1b, 0x001);
+	sp887x_writereg(fe, 0xc1c, 0x000); /* parallel mode (serial mode == 1) */
+	sp887x_writereg(fe, 0xc1a, 0x871);
+
+	/* ADC mode, 2 for MT8872, 3 for SP8870/SP8871 */
+	sp887x_writereg(fe, 0x301, 0x002);
+
+	sp887x_setup_agc(fe);
+
+	/* bit 0x010: enable data valid signal */
+	sp887x_writereg(fe, 0xd00, 0x010);
+	sp887x_writereg(fe, 0x0d1, 0x000);
+
+	printk ("done.\n");
+	return 0;
+};
+
+
+/**
+ *  returns the actual tuned center frequency which can be used
+ *  to initialise the AFC registers
+ */
+static
+int tsa5060_setup_pll (struct dvb_frontend *fe, int freq)
+{
+	u8 cfg, cpump, band_select;
+	u8 buf [4];
+	u32 div;
+
+	div = (36000000 + freq + 83333) / 166666;
+	cfg = 0x88;
+
+	cpump = freq < 175000000 ? 2 : freq < 390000000 ? 1 :
+		freq < 470000000 ? 2 : freq < 750000000 ? 2 : 3;
+
+	band_select = freq < 175000000 ? 0x0e : freq < 470000000 ? 0x05 : 0x03;
+
+	buf [0] = (div >> 8) & 0x7f;
+	buf [1] = div & 0xff;
+	buf [2] = ((div >> 10) & 0x60) | cfg;
+	buf [3] = cpump | band_select;
+
+	/* open i2c gate for PLL message transmission... */
+	sp887x_writereg(fe, 0x206, 0x001);
+	i2c_writebytes(fe, 0x60, buf, 4);
+	sp887x_writereg(fe, 0x206, 0x000);
+
+	return (div * 166666 - 36000000);
+}
+
+
+
+static
+int configure_reg0xc05 (struct dvb_frontend_parameters *p, u16 *reg0xc05)
+{
+	int known_parameters = 1;
+	
+	*reg0xc05 = 0x000;
+
+	switch (p->u.ofdm.constellation) {
+	case QPSK:
+		break;
+	case QAM_16:
+		*reg0xc05 |= (1 << 10);
+		break;
+	case QAM_64:
+		*reg0xc05 |= (2 << 10);
+		break;
+	case QAM_AUTO:
+		known_parameters = 0;
+		break;
+	default:
+		return -EINVAL;
+	};
+
+	switch (p->u.ofdm.hierarchy_information) {
+	case HIERARCHY_NONE:
+		break;
+	case HIERARCHY_1:
+		*reg0xc05 |= (1 << 7);
+		break;
+	case HIERARCHY_2:
+		*reg0xc05 |= (2 << 7);
+		break;
+	case HIERARCHY_4:
+		*reg0xc05 |= (3 << 7);
+		break;
+	case HIERARCHY_AUTO:
+		known_parameters = 0;
+		break;
+	default:
+		return -EINVAL;
+	};
+
+	switch (p->u.ofdm.code_rate_HP) {
+	case FEC_1_2:
+		break;
+	case FEC_2_3:
+		*reg0xc05 |= (1 << 3);
+		break;
+	case FEC_3_4:
+		*reg0xc05 |= (2 << 3);
+		break;
+	case FEC_5_6:
+		*reg0xc05 |= (3 << 3);
+		break;
+	case FEC_7_8:
+		*reg0xc05 |= (4 << 3);
+		break;
+	case FEC_AUTO:
+		known_parameters = 0;
+		break;
+	default:
+		return -EINVAL;
+	};
+
+	if (known_parameters)
+		*reg0xc05 |= (2 << 1);	/* use specified parameters */
+	else
+		*reg0xc05 |= (1 << 1);	/* enable autoprobing */
+
+	return 0;
+}
+
+
+/**
+ *  estimates division of two 24bit numbers,
+ *  derived from the ves1820/stv0299 driver code
+ */
+static
+void divide (int n, int d, int *quotient_i, int *quotient_f)
+{
+	unsigned int q, r;
+
+	r = (n % d) << 8;
+	q = (r / d);
+
+	if (quotient_i)
+		*quotient_i = q;
+
+	if (quotient_f) {
+		r = (r % d) << 8;
+		q = (q << 8) | (r / d);
+		r = (r % d) << 8;
+		*quotient_f = (q << 8) | (r / d);
+	}
+}
+
+
+static
+void sp887x_correct_offsets (struct dvb_frontend *fe,
+			     struct dvb_frontend_parameters *p,
+			     int actual_freq)
+{
+	static const u32 srate_correction [] = { 1879617, 4544878, 8098561 };
+	int bw_index = p->u.ofdm.bandwidth - BANDWIDTH_8_MHZ;
+	int freq_offset = actual_freq - p->frequency;
+	int sysclock = 61003; //[kHz]
+	int ifreq = 36000000;
+	int freq;
+	int frequency_shift;
+
+	if (p->inversion == INVERSION_ON)
+		freq = ifreq - freq_offset;
+	else
+		freq = ifreq + freq_offset;
+
+	divide(freq / 333, sysclock, NULL, &frequency_shift);
+
+	if (p->inversion == INVERSION_ON)
+		frequency_shift = -frequency_shift;
+
+	/* sample rate correction */
+	sp887x_writereg(fe, 0x319, srate_correction[bw_index] >> 12);
+	sp887x_writereg(fe, 0x31a, srate_correction[bw_index] & 0xfff);
+
+	/* carrier offset correction */
+	sp887x_writereg(fe, 0x309, frequency_shift >> 12);
+	sp887x_writereg(fe, 0x30a, frequency_shift & 0xfff);
+}
+
+
+static
+int sp887x_setup_frontend_parameters (struct dvb_frontend *fe,
+				      struct dvb_frontend_parameters *p)
+{
+	int actual_freq, err;
+	u16 val, reg0xc05;
+
+	if (p->u.ofdm.bandwidth != BANDWIDTH_8_MHZ &&
+	    p->u.ofdm.bandwidth != BANDWIDTH_7_MHZ &&
+	    p->u.ofdm.bandwidth != BANDWIDTH_6_MHZ)
+		return -EINVAL;
+	
+	if ((err = configure_reg0xc05(p, &reg0xc05)))
+		return err;
+
+	sp887x_microcontroller_stop(fe);
+
+	actual_freq = tsa5060_setup_pll(fe, p->frequency);
+
+	/* read status reg in order to clear pending irqs */
+	sp887x_readreg(fe, 0x200);
+
+	sp887x_correct_offsets(fe, p, actual_freq);
+
+	/* filter for 6/7/8 Mhz channel */
+	if (p->u.ofdm.bandwidth == BANDWIDTH_6_MHZ)
+		val = 2;
+	else if (p->u.ofdm.bandwidth == BANDWIDTH_7_MHZ)
+		val = 1;
+	else
+		val = 0;
+
+	sp887x_writereg(fe, 0x311, val);
+
+	/* scan order: 2k first = 0, 8k first = 1 */
+	if (p->u.ofdm.transmission_mode == TRANSMISSION_MODE_2K)
+		sp887x_writereg(fe, 0x338, 0x000);
+	else
+		sp887x_writereg(fe, 0x338, 0x001);
+
+	sp887x_writereg(fe, 0xc05, reg0xc05);
+
+	if (p->u.ofdm.bandwidth == BANDWIDTH_6_MHZ)
+		val = 2 << 3;
+	else if (p->u.ofdm.bandwidth == BANDWIDTH_7_MHZ)
+		val = 3 << 3;
+	else
+		val = 0 << 3;
+
+	/* enable OFDM and SAW bits as lock indicators in sync register 0xf17,
+	 * optimize algorithm for given bandwidth...
+	 */
+	sp887x_writereg(fe, 0xf14, 0x160 | val);
+	sp887x_writereg(fe, 0xf15, 0x000);
+
+	sp887x_microcontroller_start(fe);
+	return 0;
+}
+
+
+static
+int sp887x_ioctl (struct dvb_frontend *fe, unsigned int cmd, void *arg)
+{
+        switch (cmd) {
+        case FE_GET_INFO:
+		memcpy (arg, &sp887x_info, sizeof(struct dvb_frontend_info));
+		break;
+
+        case FE_READ_STATUS:
+	{
+		u16 snr12 = sp887x_readreg(fe, 0xf16);
+		u16 sync0x200 = sp887x_readreg(fe, 0x200);
+		u16 sync0xf17 = sp887x_readreg(fe, 0xf17);
+		fe_status_t *status = arg;
+
+		*status = 0;
+
+		if (snr12 > 0x00f)
+			*status |= FE_HAS_SIGNAL;
+
+		//if (sync0x200 & 0x004)
+		//	*status |= FE_HAS_SYNC | FE_HAS_CARRIER;
+
+		//if (sync0x200 & 0x008)
+		//	*status |= FE_HAS_VITERBI;
+
+		if ((sync0xf17 & 0x00f) == 0x002) {
+			*status |= FE_HAS_LOCK;
+			*status |= FE_HAS_VITERBI | FE_HAS_SYNC | FE_HAS_CARRIER;
+		}
+
+		if (sync0x200 & 0x001) {	/* tuner adjustment requested...*/
+			int steps = (sync0x200 >> 4) & 0x00f;
+			if (steps & 0x008)
+				steps = -steps;
+			dprintk("sp887x: implement tuner adjustment (%+i steps)!!\n",
+			       steps);
+		}
+
+		break;
+
+	}
+
+        case FE_READ_BER:
+	{
+		u32* ber = arg;
+		*ber = (sp887x_readreg(fe, 0xc08) & 0x3f) |
+		       (sp887x_readreg(fe, 0xc07) << 6);
+		sp887x_writereg(fe, 0xc08, 0x000);
+		sp887x_writereg(fe, 0xc07, 0x000);
+		if (*ber >= 0x3fff0)
+			*ber = ~0;
+		break;
+
+	}
+
+        case FE_READ_SIGNAL_STRENGTH:		// FIXME: correct registers ?
+	{
+		u16 snr12 = sp887x_readreg(fe, 0xf16);
+		u32 signal = 3 * (snr12 << 4);
+		*((u16*) arg) = (signal < 0xffff) ? signal : 0xffff;
+		break;
+	}
+
+        case FE_READ_SNR:
+	{
+		u16 snr12 = sp887x_readreg(fe, 0xf16);
+		*(u16*) arg = (snr12 << 4) | (snr12 >> 8);
+		break;
+	}
+
+	case FE_READ_UNCORRECTED_BLOCKS:
+	{
+		u32 *ublocks = (u32 *) arg;
+		*ublocks = sp887x_readreg(fe, 0xc0c);
+		if (*ublocks == 0xfff)
+			*ublocks = ~0;
+		break;
+	}
+
+        case FE_SET_FRONTEND:
+		return sp887x_setup_frontend_parameters(fe, arg);
+
+	case FE_GET_FRONTEND:  // FIXME: read known values back from Hardware...
+		break;
+
+        case FE_SLEEP:
+		/* tristate TS output and disable interface pins */
+		sp887x_writereg(fe, 0xc18, 0x000);
+		break;
+
+        case FE_INIT:
+		if (fe->data == NULL) {	  /* first time initialisation... */
+			fe->data = (void*) ~0;
+			sp887x_initial_setup (fe);
+		}
+		/* enable TS output and interface pins */
+		sp887x_writereg(fe, 0xc18, 0x00d);
+		break;
+
+	default:
+		return -EOPNOTSUPP;
+        };
+
+        return 0;
+}
+
+
+
+static
+int sp887x_attach (struct dvb_i2c_bus *i2c)
+{
+	struct i2c_msg msg = { addr: 0x70, flags: 0, buf: NULL, len: 0 };
+
+	dprintk ("%s\n", __FUNCTION__);
+
+	if (i2c->xfer (i2c, &msg, 1) != 1)
+                return -ENODEV;
+
+	dvb_register_frontend (sp887x_ioctl, i2c, NULL, &sp887x_info);
+
+	return 0;
+}
+
+
+static
+void sp887x_detach (struct dvb_i2c_bus *i2c)
+{
+	dprintk ("%s\n", __FUNCTION__);
+	dvb_unregister_frontend (sp887x_ioctl, i2c);
+}
+
+
+static
+int __init init_sp887x (void)
+{
+	dprintk ("%s\n", __FUNCTION__);
+	return dvb_register_i2c_device (NULL, sp887x_attach, sp887x_detach);
+}
+
+
+static
+void __exit exit_sp887x (void)
+{
+	dprintk ("%s\n", __FUNCTION__);
+	dvb_unregister_i2c_device (sp887x_attach);
+}
+
+
+module_init(init_sp887x);
+module_exit(exit_sp887x);
+
+
+MODULE_DESCRIPTION("sp887x DVB-T demodulator driver");
+MODULE_LICENSE("GPL");
+
+

