V4L/DVB (9365): adding lgdt3304 based driver

lgdt3304.c:
frontend driver for the lgdt3304 chip, this driver is not compatible
with the lgdt330x.

Signed-off-by: Markus Rechberger <[e-mail]>
Signed-off-by: Mauro Carvalho Chehab <[e-mail]>

drivers/media/video/empia/lgdt3304/Makefile

···
+lgdt3304-demod-objs   := lgdt3304.o
+
+obj-m += lgdt3304-demod.o
+
+EXTRA_CFLAGS += -Idrivers/media/dvb/dvb-core
+EXTRA_CFLAGS += -Idrivers/media/dvb/frontends
+EXTRA_CFLAGS += -DCONFIG_DVB_LGDT3304

drivers/media/video/empia/lgdt3304/lgdt3304.c

···
+/*
+ * Driver for LG ATSC lgdt3304 driver
+ *
+ * Copyright (C) 2008 Markus Rechberger <[e-mail]>
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/delay.h>
+#include "dvb_frontend.h"
+#include "lgdt3304.h"
+
+static  unsigned int debug = 0;
+module_param(debug, int, 0644);
+MODULE_PARM_DESC(debug,"lgdt3304 debugging (default off)");
+
+#define dprintk(fmt, args...) if (debug) do {\
+			printk("lgdt3304 debug: " fmt, ##args); } while (0)
+
+struct lgdt3304_state
+{
+        struct dvb_frontend frontend;
+        fe_modulation_t current_modulation;
+        __u32 snr;
+        __u32 current_frequency;
+	__u8 addr;
+	struct i2c_adapter *i2c;
+};
+
+static int i2c_write_demod_bytes (struct dvb_frontend *fe, __u8 *buf, int len)
+{
+	struct lgdt3304_state *state = fe->demodulator_priv;
+	struct i2c_msg i2cmsgs = {
+		.addr = state->addr,
+		.flags = 0,
+		.len = 3,
+		.buf = buf
+	};
+        int i;
+        int err;
+
+        for (i=0; i<len-1; i+=3){
+		if((err = i2c_transfer(state->i2c, &i2cmsgs, 1))<0) {
+			printk("%s i2c_transfer error %d\n", __FUNCTION__, err);
+                        if (err < 0)
+                                return err;
+                        else
+                                return -EREMOTEIO;
+                }
+                i2cmsgs.buf += 3;
+        }
+        return 0;
+}
+
+static int lgdt3304_i2c_read_reg(struct dvb_frontend *fe, unsigned int reg)
+{
+	struct lgdt3304_state *state = fe->demodulator_priv;
+	struct i2c_msg i2cmsgs[2];
+	int ret;
+	__u8 buf;
+
+	__u8 regbuf[2] = { reg>>8, reg&0xff };
+
+	i2cmsgs[0].addr = state->addr;
+	i2cmsgs[0].flags = 0;
+	i2cmsgs[0].len = 2;
+	i2cmsgs[0].buf = regbuf;
+
+	i2cmsgs[1].addr = state->addr;
+	i2cmsgs[1].flags = I2C_M_RD;
+	i2cmsgs[1].len = 1;
+	i2cmsgs[1].buf = &buf;
+
+	if((ret = i2c_transfer(state->i2c, i2cmsgs, 2))<0) {
+		printk("%s i2c_transfer error %d\n", __FUNCTION__, ret);
+		return ret;
+	}
+
+	return buf;
+}
+
+static int lgdt3304_i2c_write_reg(struct dvb_frontend *fe, int reg, int val)
+{
+	struct lgdt3304_state *state = fe->demodulator_priv;
+	char buffer[3] = { reg>>8, reg&0xff, val };
+	int ret;
+
+	struct i2c_msg i2cmsgs = {
+		.addr = state->addr,
+		.flags = 0,
+		.len = 3,
+		.buf=buffer
+	};
+	ret = i2c_transfer(state->i2c, &i2cmsgs, 1);
+	if (ret != 1) {
+		printk("%s i2c_transfer error %d\n", __FUNCTION__, ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+
+static int lgdt3304_soft_Reset(struct dvb_frontend *fe)
+{
+	lgdt3304_i2c_write_reg(fe, 0x0002, 0x9a);
+	lgdt3304_i2c_write_reg(fe, 0x0002, 0x9b);
+	mdelay(200);
+	return 0;
+}
+
+static int lgdt3304_set_parameters(struct dvb_frontend *fe, struct dvb_frontend_parameters *param) {
+	int err = 0;
+
+	static __u8 lgdt3304_vsb8_data[] = {
+		/* 16bit  , 8bit */
+		/* regs   , val  */
+		0x00, 0x00, 0x02,
+		0x00, 0x00, 0x13,
+		0x00, 0x0d, 0x02,
+		0x00, 0x0e, 0x02,
+		0x00, 0x12, 0x32,
+		0x00, 0x13, 0xc4,
+		0x01, 0x12, 0x17,
+		0x01, 0x13, 0x15,
+		0x01, 0x14, 0x18,
+		0x01, 0x15, 0xff,
+		0x01, 0x16, 0x2c,
+		0x02, 0x14, 0x67,
+		0x02, 0x24, 0x8d,
+		0x04, 0x27, 0x12,
+		0x04, 0x28, 0x4f,
+		0x03, 0x08, 0x80,
+		0x03, 0x09, 0x00,
+		0x03, 0x0d, 0x00,
+		0x03, 0x0e, 0x1c,
+		0x03, 0x14, 0xe1,
+		0x05, 0x0e, 0x5b,
+	};
+
+	/* not yet tested .. */
+	static __u8 lgdt3304_qam64_data[] = {
+		/* 16bit  , 8bit */
+		/* regs   , val  */
+		0x00, 0x00, 0x18,
+		0x00, 0x0d, 0x02,
+		//0x00, 0x0e, 0x02,
+		0x00, 0x12, 0x2a,
+		0x00, 0x13, 0x00,
+		0x03, 0x14, 0xe3,
+		0x03, 0x0e, 0x1c,
+		0x03, 0x08, 0x66,
+		0x03, 0x09, 0x66,
+		0x03, 0x0a, 0x08,
+		0x03, 0x0b, 0x9b,
+		0x05, 0x0e, 0x5b,
+	};
+
+
+	/* tested with KWorld a340 */
+	static __u8 lgdt3304_qam256_data[] = {
+		/* 16bit  , 8bit */
+		/* regs   , val  */
+		0x00, 0x00, 0x01,  //0x19,
+		0x00, 0x12, 0x2a,
+		0x00, 0x13, 0x80,
+		0x00, 0x0d, 0x02,
+		0x03, 0x14, 0xe3,
+
+		0x03, 0x0e, 0x1c,
+		0x03, 0x08, 0x66,
+		0x03, 0x09, 0x66,
+		0x03, 0x0a, 0x08,
+		0x03, 0x0b, 0x9b,
+
+		0x03, 0x0d, 0x14,
+		//0x05, 0x0e, 0x5b,
+		0x01, 0x06, 0x4a,
+		0x01, 0x07, 0x3d,
+		0x01, 0x08, 0x70,
+		0x01, 0x09, 0xa3,
+
+		0x05, 0x04, 0xfd,
+
+		0x00, 0x0d, 0x82,
+
+		0x05, 0x0e, 0x5b,
+
+		0x05, 0x0e, 0x5b,
+
+		0x00, 0x02, 0x9a,
+
+		0x00, 0x02, 0x9b,
+
+		0x00, 0x00, 0x01,
+		0x00, 0x12, 0x2a,
+		0x00, 0x13, 0x80,
+		0x00, 0x0d, 0x02,
+		0x03, 0x14, 0xe3,
+
+		0x03, 0x0e, 0x1c,
+		0x03, 0x08, 0x66,
+		0x03, 0x09, 0x66,
+		0x03, 0x0a, 0x08,
+		0x03, 0x0b, 0x9b,
+
+		0x03, 0x0d, 0x14,
+		0x01, 0x06, 0x4a,
+		0x01, 0x07, 0x3d,
+		0x01, 0x08, 0x70,
+		0x01, 0x09, 0xa3,
+
+		0x05, 0x04, 0xfd,
+
+		0x00, 0x0d, 0x82,
+
+		0x05, 0x0e, 0x5b,
+	};
+
+	struct lgdt3304_state *state = fe->demodulator_priv;
+	if (state->current_modulation != param->u.vsb.modulation) {
+		switch(param->u.vsb.modulation) {
+		case VSB_8:
+			err = i2c_write_demod_bytes(fe, lgdt3304_vsb8_data,
+					sizeof(lgdt3304_vsb8_data));
+			break;
+		case QAM_64:
+			err = i2c_write_demod_bytes(fe, lgdt3304_qam64_data,
+					sizeof(lgdt3304_qam64_data));
+			break;
+		case QAM_256:
+			err = i2c_write_demod_bytes(fe, lgdt3304_qam256_data,
+					sizeof(lgdt3304_qam256_data));
+			break;
+		default:
+			break;
+		}
+
+		if (err) {
+			printk("%s error setting modulation\n", __FUNCTION__);
+		} else {
+			state->current_modulation = param->u.vsb.modulation;
+		}
+	}
+	state->current_frequency = param->frequency;
+
+	lgdt3304_soft_Reset(fe);
+
+
+        if (fe->ops.tuner_ops.set_params)
+                fe->ops.tuner_ops.set_params(fe, param);
+
+	return 0;
+}
+
+static int lgdt3304_init(struct dvb_frontend *fe) {
+        return 0;
+}
+
+static int lgdt3304_sleep(struct dvb_frontend *fe) {
+	return 0;
+}
+
+
+static int lgdt3304_read_status(struct dvb_frontend *fe, fe_status_t *status)
+{
+	struct lgdt3304_state *state = fe->demodulator_priv;
+	int r011d;
+	int qam_lck;
+
+	*status = 0;
+	dprintk("lgdt read status\n");
+
+	r011d = lgdt3304_i2c_read_reg(fe, 0x011d);
+
+	dprintk("%02x\n", r011d);
+
+	switch(state->current_modulation) {
+	case VSB_8:
+		if (r011d & 0x80) {
+			dprintk("VSB Locked\n");
+			*status |= FE_HAS_CARRIER;
+			*status |= FE_HAS_LOCK;
+			*status |= FE_HAS_SYNC;
+			*status |= FE_HAS_SIGNAL;
+		}
+		break;
+	case QAM_64:
+	case QAM_256:
+		qam_lck = r011d & 0x7;
+		switch(qam_lck) {
+			case 0x0: dprintk("Unlock\n");
+				  break;
+			case 0x4: dprintk("1st Lock in acquisition state\n");
+				  break;
+			case 0x6: dprintk("2nd Lock in acquisition state\n");
+				  break;
+			case 0x7: dprintk("Final Lock in good reception state\n");
+				  *status |= FE_HAS_CARRIER;
+				  *status |= FE_HAS_LOCK;
+				  *status |= FE_HAS_SYNC;
+				  *status |= FE_HAS_SIGNAL;
+				  break;
+		}
+		break;
+	default:
+		printk("%s unhandled modulation\n", __FUNCTION__);
+	}
+
+
+	return 0;
+}
+
+static int lgdt3304_read_ber(struct dvb_frontend *fe, __u32 *ber)
+{
+	dprintk("read ber\n");
+	return 0;
+}
+
+static int lgdt3304_read_snr(struct dvb_frontend *fe, __u16 *snr)
+{
+	dprintk("read snr\n");
+	return 0;
+}
+
+static int lgdt3304_read_ucblocks(struct dvb_frontend *fe, __u32 *ucblocks)
+{
+	dprintk("read ucblocks\n");
+	return 0;
+}
+
+static void lgdt3304_release(struct dvb_frontend *fe)
+{
+	struct lgdt3304_state *state = (struct lgdt3304_state *)fe->demodulator_priv;
+	kfree(state);
+}
+
+static struct dvb_frontend_ops demod_lgdt3304={
+	.info = {
+		.name = "LG 3304",
+		.type = FE_ATSC,
+		.frequency_min = 54000000,
+		.frequency_max = 858000000,
+		.frequency_stepsize = 62500,
+		.symbol_rate_min = 5056941,
+		.symbol_rate_max = 10762000,
+		.caps = FE_CAN_QAM_64 | FE_CAN_QAM_256 | FE_CAN_8VSB
+	},
+	.init = lgdt3304_init,
+	.sleep = lgdt3304_sleep,
+	.set_frontend = lgdt3304_set_parameters,
+	.read_snr = lgdt3304_read_snr,
+	.read_ber = lgdt3304_read_ber,
+	.read_status = lgdt3304_read_status,
+	.read_ucblocks = lgdt3304_read_ucblocks,
+	.release = lgdt3304_release,
+};
+
+struct dvb_frontend* lgdt3304_attach(const struct lgdt3304_config *config,
+					   struct i2c_adapter *i2c)
+{
+
+	struct lgdt3304_state *state;
+	state = kzalloc(sizeof(struct lgdt3304_state), GFP_KERNEL);
+	memset(state, 0x0, sizeof(struct lgdt3304_state));
+	state->addr = config->i2c_address;
+	state->i2c = i2c;
+
+	memcpy(&state->frontend.ops, &demod_lgdt3304, sizeof(struct dvb_frontend_ops));
+	state->frontend.demodulator_priv = state;
+	return &state->frontend;
+}
+
+EXPORT_SYMBOL_GPL(lgdt3304_attach);
+MODULE_AUTHOR("Markus Rechberger <[e-mail]>");
+MODULE_DESCRIPTION("LGE LGDT3304 DVB-T demodulator driver");
+MODULE_LICENSE("GPL");

drivers/media/video/empia/lgdt3304/lgdt3304.h

···
+/*
+ *  Driver for DVB-T lgdt3304 demodulator
+ *
+ *  Copyright (C) 2008 Markus Rechberger <[e-mail]>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.=
+ */
+
+#ifndef LGDT3304_H
+#define LGDT3304_H
+
+#include <linux/dvb/frontend.h>
+
+struct lgdt3304_config
+{
+	/* demodulator's I2C address */
+	u8 i2c_address;
+};
+
+#if defined(CONFIG_DVB_LGDT3304) || (defined(CONFIG_DVB_LGDT3304_MODULE) && defined(MODULE))
+extern struct dvb_frontend* lgdt3304_attach(const struct lgdt3304_config *config,
+					   struct i2c_adapter *i2c);
+#else
+static inline struct dvb_frontend* lgdt3304_attach(const struct lgdt3304_config *config,
+					   struct i2c_adapter *i2c)
+{
+	printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
+	return NULL;
+}
+#endif /* CONFIG_DVB_LGDT */
+
+#endif /* LGDT3304_H */