/* tuner-xc2028
 *
 * Copyright (c) 2007 Mauro Carvalho Chehab (mchehab@infradead.org)
 *
 * Copyright (c) 2007 Michel Ludwig (michel.ludwig@gmail.com)
 *       - frontend interface
 *
 * This code is placed under the terms of the GNU General Public License v2
 */

#include <linux/i2c.h>
#include <asm/div64.h>
#include <linux/firmware.h>
#include <linux/videodev.h>
#include <linux/delay.h>
#include <media/tuner.h>
#include <linux/mutex.h>
#include "tuner-i2c.h"
#include "tuner-xc2028.h"
#include "tuner-xc2028-types.h"

#include <linux/dvb/frontend.h>
#include "dvb_frontend.h"

#define PREFIX "xc2028 "

static LIST_HEAD(xc2028_list);
/* struct for storing firmware table */
struct firmware_description {
	unsigned int  type;
	v4l2_std_id   id;
	unsigned char *ptr;
	unsigned int  size;
};

struct xc2028_data {
	struct list_head        xc2028_list;
	struct tuner_i2c_props  i2c_props;
	int                     (*tuner_callback) (void *dev,
						   int command, int arg);
	struct device           *dev;
	void			*video_dev;
	int			count;
	__u32			frequency;

	struct firmware_description *firm;
	int			firm_size;

	__u16			version;

	struct xc2028_ctrl	ctrl;

	v4l2_std_id		firm_type;	   /* video stds supported
							by current firmware */
	fe_bandwidth_t		bandwidth;	   /* Firmware bandwidth:
							      6M, 7M or 8M */
	int			need_load_generic; /* The generic firmware
							      were loaded? */

	int			max_len;	/* Max firmware chunk */

	enum tuner_mode	mode;
	struct i2c_client	*i2c_client;

	struct mutex lock;
};

#define i2c_send(rc, priv, buf, size)					\
if (size != (rc = tuner_i2c_xfer_send(&priv->i2c_props, buf, size)))	\
	tuner_info("i2c output error: rc = %d (should be %d)\n",	\
	rc, (int)size);

#define i2c_rcv(rc, priv, buf, size)					\
if (size != (rc = tuner_i2c_xfer_recv(&priv->i2c_props, buf, size)))	\
	tuner_info("i2c input error: rc = %d (should be %d)\n",		\
	rc, (int)size);

#define send_seq(priv, data...)						\
{	int rc;								\
	static u8 _val[] = data;					\
	if (sizeof(_val) !=						\
			(rc = tuner_i2c_xfer_send (&priv->i2c_props,	\
						_val, sizeof(_val)))) {	\
		tuner_info("Error on line %d: %d\n",__LINE__,rc);	\
		return -EINVAL;							\
	}								\
	msleep (10);							\
}

static int xc2028_get_reg(struct xc2028_data *priv, u16 reg)
{
	int rc;
	unsigned char buf[1];

	tuner_info("%s called\n", __FUNCTION__);

	buf[0]= reg;

	i2c_send(rc, priv, buf, sizeof(buf));
	if (rc<0)
		return rc;

	i2c_rcv(rc, priv, buf, 2);
	if (rc<0)
		return rc;

	return (buf[1])|(buf[0]<<8);
}

static void free_firmware (struct xc2028_data *priv)
{
	int i;

	if (!priv->firm)
		return;

	for (i=0;i<priv->firm_size;i++) {
		if (priv->firm[i].ptr)
			kfree(priv->firm[i].ptr);
	}
	kfree(priv->firm);

	priv->firm=NULL;
	priv->need_load_generic = 1;
}

static int load_all_firmwares (struct dvb_frontend *fe)
{
	struct xc2028_data    *priv = fe->tuner_priv;
	const struct firmware *fw=NULL;
	unsigned char         *p, *endp;
	int                   rc=0, n, n_array;
	char		      name[33];

	tuner_info("%s called\n", __FUNCTION__);

	tuner_info("Loading firmware %s\n", priv->ctrl.fname);
	rc = request_firmware(&fw, priv->ctrl.fname, priv->dev);
	if (rc < 0) {
		if (rc==-ENOENT)
			tuner_info("Error: firmware %s not found.\n",
				   priv->ctrl.fname);
		else
			tuner_info("Error %d while requesting firmware %s \n",
				   rc, priv->ctrl.fname);

		return rc;
	}
	p=fw->data;
	endp=p+fw->size;

	if(fw->size<sizeof(name)-1+2) {
		tuner_info("Error: firmware size is zero!\n");
		rc=-EINVAL;
		goto done;
	}

	memcpy(name,p,sizeof(name)-1);
	name[sizeof(name)-1]=0;
	p+=sizeof(name)-1;

	priv->version = le16_to_cpu(*(__u16 *)p);
	p += 2;

	tuner_info("firmware: %s, ver %d.%d\n", name,
					priv->version>>8, priv->version&0xff);

	if (p+2>endp)
		goto corrupt;

	n_array = le16_to_cpu(*(__u16 *)p);
	p += 2;

	tuner_info("there are %d firmwares at %s\n", n_array, priv->ctrl.fname);

	priv->firm=kzalloc(sizeof(*priv->firm)*n_array,GFP_KERNEL);

	if (!fw) {
		tuner_info("Not enough memory for loading firmware.\n");
		rc=-ENOMEM;
		goto done;
	}

	priv->firm_size = n_array;
	n=-1;
	while (p<endp) {
		__u32 type, size;
		v4l2_std_id id;

		n++;
		if (n >= n_array) {
			tuner_info("Too much firmwares at the file\n");
			goto corrupt;
		}

		/* Checks if there's enough bytes to read */
		if (p+sizeof(type)+sizeof(id)+sizeof(size)>endp) {
			tuner_info("Lost firmware!\n");
			goto corrupt;
		}

		type = le32_to_cpu(*(__u32 *)p);
		p += sizeof(type);

		id = le64_to_cpu(*(v4l2_std_id *)p);
		p += sizeof(id);

		size = le32_to_cpu(*(v4l2_std_id *)p);
		p += sizeof(size);

		if ((!size)||(size+p>endp)) {
			tuner_info("Firmware type %x, id %lx corrupt\n",
				   type, (unsigned long) id);
			goto corrupt;
		}

		priv->firm[n].ptr=kzalloc(size,GFP_KERNEL);
		if (!priv->firm[n].ptr) {
			tuner_info("Not enough memory.\n");
			rc=-ENOMEM;
			goto err;
		}
		tuner_info("Loading firmware type %x, id %lx, size=%d.\n",
				   type, (unsigned long) id, size);

		memcpy(priv->firm[n].ptr, p, size);
		priv->firm[n].type = type;
		priv->firm[n].id   = id;
		priv->firm[n].size = size;

		p += size;
	}

	if (n+1 != priv->firm_size) {
		tuner_info("Firmware file is incomplete!\n");
		goto corrupt;
	}

	goto done;

corrupt:
	rc=-EINVAL;
	tuner_info("Error: firmware file is corrupted!\n");

err:
	tuner_info("Releasing loaded firmware file.\n");

	free_firmware(priv);

done:
	release_firmware(fw);
	tuner_info("Firmware files loaded.\n");

	return rc;
}

static int load_firmware (struct dvb_frontend *fe, unsigned int type,
			  v4l2_std_id *id)
{
	struct xc2028_data *priv = fe->tuner_priv;
	int i, rc;
	unsigned char *p, *endp, buf[priv->max_len];

	tuner_info("%s called\n", __FUNCTION__);

	if (!priv->firm) {
		printk (KERN_ERR PREFIX "Error! firmware not loaded\n");
		return -EINVAL;
	}

	if ((type == 0) && (*id == 0))
		*id=V4L2_STD_PAL;

	/* Seek for exact match */
	for (i=0;i<priv->firm_size;i++) {
		if ( (type == priv->firm[i].type) &&
						(*id == priv->firm[i].id))
			goto found;
	}

	/* Seek for generic video standard match */
	for (i=0;i<priv->firm_size;i++) {
		if ( (type == priv->firm[i].type) && (*id & priv->firm[i].id))
			goto found;
	}

	/*FIXME: Would make sense to seek for type "hint" match ? */

	tuner_info ("Can't find firmware for type=%x, id=%lx\n", type,
		    (long int)*id);
	return -EINVAL;

found:
	*id = priv->firm[i].id;
	tuner_info ("Found firmware for type=%x, id=%lx\n", type,
		    (long int)*id);

	p = priv->firm[i].ptr;

	if (!p) {
		printk(KERN_ERR PREFIX "Firmware pointer were freed!");
		return -EINVAL;
	}
	endp = p+priv->firm[i].size;

	while (p<endp) {
		__u16 size;

		/* Checks if there's enough bytes to read */
		if (p+sizeof(size)>endp) {
			tuner_info("missing bytes\n");
			return -EINVAL;
		}


		size = le16_to_cpu(*(__u16 *)p);
		p += sizeof(size);

		if (size == 0xffff)
			return 0;

		if (!size) {
			/* Special callback command received */
			rc = priv->tuner_callback(priv->video_dev,
					     XC2028_TUNER_RESET, 0);
			if (rc<0) {
				tuner_info("Error at RESET code %d\n",
								(*p)&0x7f);
				return -EINVAL;
			}
			continue;
		}

		/* Checks for a sleep command */
		if (size & 0x8000) {
			msleep (size & 0x7fff);
			continue;
		}

		if ((size + p > endp)) {
			tuner_info("missing bytes: need %d, have %d\n",
					size, (int)(endp-p));
			return -EINVAL;
		}

		buf[0] = *p;
		p++;
		size--;

		/* Sends message chunks */
		while (size>0) {
			int len = (size<priv->max_len-1)?size:priv->max_len-1;

			memcpy(buf+1, p, len);

			i2c_send(rc, priv, buf, len+1);
			if (rc<0) {
				tuner_info("%d returned from send\n",rc);
				return -EINVAL;
			}

			p += len;
			size -= len;
		}
	}
	return -EINVAL;
}

static int check_firmware(struct dvb_frontend *fe, enum tuner_mode new_mode,
						v4l2_std_id std,
						fe_bandwidth_t bandwidth)
{
	struct xc2028_data      *priv = fe->tuner_priv;
	int			rc, version;
	v4l2_std_id		std0=0;
	unsigned int		type0=0,type=0;
	int			change_digital_bandwidth;

	tuner_info("%s called\n", __FUNCTION__);

	if (!priv->firm) {
		if (!priv->ctrl.fname)
			return -EINVAL;

		rc=load_all_firmwares(fe);
		if (rc<0)
			return rc;
	}

	tuner_info( "I am in mode %u and I should switch to mode %i\n",
						    priv->mode, new_mode);

	/* first of all, determine whether we have switched the mode */
	if(new_mode != priv->mode) {
		priv->mode = new_mode;
		priv->need_load_generic = 1;
	}

	change_digital_bandwidth = (priv->mode == T_DIGITAL_TV
				 && bandwidth != priv->bandwidth) ? 1 : 0;
	tuner_info("old bandwidth %u, new bandwidth %u\n", priv->bandwidth,
		    bandwidth);

	if (priv->need_load_generic) {
		/* Reset is needed before loading firmware */
		rc = priv->tuner_callback(priv->video_dev,
					  XC2028_TUNER_RESET, 0);
		if (rc<0)
			return rc;

		type0=BASE;

		if (priv->ctrl.type == XC2028_FIRM_MTS)
			type0 |= MTS;

		if (priv->bandwidth==8)
			type0 |= F8MHZ;

		/* FIXME: How to load FM and FM|INPUT1 firmwares? */

		rc = load_firmware(fe, type0, &std0);
		if (rc<0) {
			tuner_info("Error %d while loading generic firmware\n",
				   rc);
			return rc;
		}

		priv->need_load_generic=0;
		priv->firm_type=0;
		if(priv->mode == T_DIGITAL_TV) {
			change_digital_bandwidth=1;
		}
	}

	tuner_info("I should change bandwidth %u\n",
						   change_digital_bandwidth);

	if (change_digital_bandwidth) {

		/*FIXME: Should allow selecting between D2620 and D2633 */
		type |= D2620;

		/* FIXME: When should select a DTV78 firmware?
		 */
		switch(bandwidth) {
		case BANDWIDTH_8_MHZ:
			type |= DTV8;
			break;
		case BANDWIDTH_7_MHZ:
			type |= DTV7;
			break;
		case BANDWIDTH_6_MHZ:
			/* FIXME: Should allow select also ATSC */
			type |= DTV6_QAM;
			break;

		default:
			tuner_info("error: bandwidth not supported.\n");
		};
		priv->bandwidth = bandwidth;
	}

	/* Load INIT1, if needed */
	tuner_info("Trying to load init1 firmware\n");
	type0 = BASE | INIT1 | priv->ctrl.type;
	if (priv->ctrl.type == XC2028_FIRM_MTS)
		type0 |= MTS;

	/* FIXME: Should handle errors - if INIT1 found */
	rc = load_firmware(fe, type0, &std0);

	/* FIXME: Should add support for FM radio
	 */

	if (priv->ctrl.type == XC2028_FIRM_MTS)
		type |= MTS;

	tuner_info("firmware standard to load: %08lx\n",(unsigned long) std);
	if (priv->firm_type & std) {
		tuner_info("no need to load a std-specific firmware.\n");
		return 0;
	}

	rc = load_firmware(fe, type, &std);
	if (rc<0)
		return rc;

	version = xc2028_get_reg(priv, 0x4);
	tuner_info("Firmware version is %d.%d\n",
					(version>>4)&0x0f,(version)&0x0f);

	priv->firm_type=std;

	return 0;
}

static int xc2028_signal(struct dvb_frontend *fe, u16 *strength)
{
	struct xc2028_data *priv = fe->tuner_priv;
	int                frq_lock, signal=0;

	tuner_info("%s called\n", __FUNCTION__);

	mutex_lock(&priv->lock);

	*strength = 0;

	frq_lock = xc2028_get_reg(priv, 0x2);
	if (frq_lock<=0)
		goto ret;

	/* Frequency is locked. Return signal quality */

	signal = xc2028_get_reg(priv, 0x40);

	if(signal<=0) {
		signal=frq_lock;
	}

ret:
	mutex_unlock(&priv->lock);

	*strength = signal;

	return 0;
}

#define DIV 15625

static int generic_set_tv_freq(struct dvb_frontend *fe, u32 freq /* in Hz */,
				enum tuner_mode new_mode,
				v4l2_std_id std,
				fe_bandwidth_t bandwidth)
{
	struct xc2028_data *priv = fe->tuner_priv;
	int           rc=-EINVAL;
	unsigned char buf[5];
	u32 div, offset = 0;

	tuner_info("%s called\n", __FUNCTION__);

	mutex_lock(&priv->lock);

	/* HACK: It seems that specific firmware need to be reloaded
	   when freq is changed */

	priv->firm_type=0;

	/* Reset GPIO 1 */
	rc = priv->tuner_callback(priv->video_dev, XC2028_TUNER_RESET, 0);
	if (rc<0)
		goto ret;

	msleep(10);
	tuner_info("should set frequency %d kHz)\n", freq / 1000);

	if (check_firmware(fe, new_mode, std, bandwidth)<0)
		goto ret;

	if(new_mode == T_DIGITAL_TV)
		offset = 2750000;

	div = (freq - offset + DIV/2)/DIV;

	/* CMD= Set frequency */

	if (priv->version<0x0202) {
		send_seq(priv, {0x00, 0x02, 0x00, 0x00});
	} else {
		send_seq(priv, {0x80, 0x02, 0x00, 0x00});
	}

	rc = priv->tuner_callback(priv->video_dev, XC2028_RESET_CLK, 1);
	if (rc<0)
		goto ret;

	msleep(10);

	buf[0]= 0xff & (div>>24);
	buf[1]= 0xff & (div>>16);
	buf[2]= 0xff & (div>>8);
	buf[3]= 0xff & (div);
	buf[4]= 0;

	i2c_send(rc, priv, buf, sizeof(buf));
	if (rc<0)
		goto ret;
	msleep(100);

	priv->frequency=freq;

	printk("divider= %02x %02x %02x %02x (freq=%d.%02d)\n",
		 buf[1],buf[2],buf[3],buf[4],
		 freq / 1000000, (freq%1000000)/10000);

	rc=0;

ret:
	mutex_unlock(&priv->lock);

	return rc;
}

static int xc2028_set_tv_freq(struct dvb_frontend *fe,
			struct analog_parameters *p)
{
	struct xc2028_data *priv = fe->tuner_priv;

	tuner_info("%s called\n", __FUNCTION__);

	return generic_set_tv_freq(fe, 62500l*p->frequency, T_ANALOG_TV,
					      p->std,
					      BANDWIDTH_8_MHZ /* NOT USED */);
}

static int xc2028_set_params(struct dvb_frontend *fe,
			     struct dvb_frontend_parameters *p)
{
	struct xc2028_data *priv = fe->tuner_priv;

	tuner_info("%s called\n", __FUNCTION__);

	/* FIXME: Only OFDM implemented */
	if (fe->ops.info.type != FE_OFDM) {
		tuner_info ("DTV type not implemented.\n");
		return -EINVAL;
	}

	return generic_set_tv_freq(fe, p->frequency, T_DIGITAL_TV,
						0, /* NOT USED */
						p->u.ofdm.bandwidth);

}

static int xc2028_dvb_release(struct dvb_frontend *fe)
{
	struct xc2028_data *priv = fe->tuner_priv;

	tuner_info("%s called\n", __FUNCTION__);

	priv->count--;

	if (!priv->count) {
		list_del(&priv->xc2028_list);

		if (priv->ctrl.fname)
			kfree(priv->ctrl.fname);

		free_firmware(priv);
		kfree (priv);
	}

	return 0;
}

static int xc2028_get_frequency(struct dvb_frontend *fe, u32 *frequency)
{
	struct xc2028_data *priv = fe->tuner_priv;

	tuner_info("%s called\n", __FUNCTION__);

	*frequency = priv->frequency;

	return 0;
}

static int xc2028_set_config (struct dvb_frontend *fe, void *priv_cfg)
{
	struct xc2028_data *priv = fe->tuner_priv;
	struct xc2028_ctrl *p    = priv_cfg;

	tuner_info("%s called\n", __FUNCTION__);

	priv->ctrl.type = p->type;

	if (p->fname) {
		if (priv->ctrl.fname)
			kfree(priv->ctrl.fname);

		priv->ctrl.fname = kmalloc(strlen(p->fname)+1, GFP_KERNEL);
		if (!priv->ctrl.fname)
			return -ENOMEM;

		free_firmware(priv);
		strcpy(priv->ctrl.fname, p->fname);
	}

	tuner_info("%s OK\n", __FUNCTION__);

	return 0;
}

static const struct dvb_tuner_ops xc2028_dvb_tuner_ops = {
	.info = {
			.name           = "Xceive XC3028",
			.frequency_min  =  42000000,
			.frequency_max  = 864000000,
			.frequency_step =     50000,
		},

	.set_config	   = xc2028_set_config,
	.set_analog_params = xc2028_set_tv_freq,
	.release           = xc2028_dvb_release,
	.get_frequency     = xc2028_get_frequency,
	.get_rf_strength   = xc2028_signal,
	.set_params        = xc2028_set_params,

// 	int (*sleep)(struct dvb_frontend *fe);
// 	int (*get_bandwidth)(struct dvb_frontend *fe, u32 *bandwidth);
// 	int (*get_status)(struct dvb_frontend *fe, u32 *status);
};

int xc2028_attach(struct dvb_frontend *fe, struct i2c_adapter* i2c_adap,
		  u8 i2c_addr, struct device *dev, void *video_dev,
		  int (*tuner_callback) (void *dev, int command,int arg))
{
	struct xc2028_data *priv;

	printk( KERN_INFO PREFIX "Xcv2028/3028 init called!\n");

	if (NULL == dev)
		return -ENODEV;

	if (NULL == video_dev)
		return -ENODEV;

	if (!tuner_callback) {
		printk( KERN_ERR PREFIX "No tuner callback!\n");
		return -EINVAL;
	}

	list_for_each_entry(priv, &xc2028_list, xc2028_list) {
		if (priv->dev == dev) {
			dev = NULL;
		}
	}

	if (dev) {
		priv = kzalloc(sizeof(*priv), GFP_KERNEL);
		if (priv == NULL)
			return -ENOMEM;

		fe->tuner_priv = priv;

		priv->bandwidth=BANDWIDTH_6_MHZ;
		priv->need_load_generic=1;
		priv->mode = T_UNINITIALIZED;
		priv->i2c_props.addr = i2c_addr;
		priv->i2c_props.adap = i2c_adap;
		priv->dev = dev;
		priv->video_dev = video_dev;
		priv->tuner_callback = tuner_callback;
		priv->max_len = 13;


		mutex_init(&priv->lock);

		list_add_tail(&priv->xc2028_list,&xc2028_list);
	}
	priv->count++;

	memcpy(&fe->ops.tuner_ops, &xc2028_dvb_tuner_ops,
					       sizeof(xc2028_dvb_tuner_ops));

	tuner_info("type set to %s\n", "XCeive xc2028/xc3028 tuner");

	return 0;
}

EXPORT_SYMBOL(xc2028_attach);

MODULE_DESCRIPTION("Xceive xc2028/xc3028 tuner driver");
MODULE_AUTHOR("Michel Ludwig <michel.ludwig@gmail.com>");
MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>");
MODULE_LICENSE("GPL");