/* DVB USB framework compliant Linux driver for the DVBWorld DVB-S 2102 Card
*
* Copyright (C) 2008 Igor M. Liplianin (liplianin@me.by)
*
*	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, version 2.
*
* see Documentation/dvb/README.dvb-usb for more information
*/
#include <linux/version.h>
#include "dw2102.h"
#include "stv0299.h"
#include "z0194a.h"

#ifndef USB_PID_DW2102
#define USB_PID_DW2102 0x2102
#endif

#define DW2102_READ_MSG 0
#define DW2102_WRITE_MSG 1

#define REG_1F_SYMBOLRATE_BYTE0 0x1f
#define REG_20_SYMBOLRATE_BYTE1 0x20
#define REG_21_SYMBOLRATE_BYTE2 0x21

#define DW2102_VOLTAGE_CTRL (0x1800)
#define DW2102_RC_QUERY (0x1a00)

struct dw2102_state {
	u32 last_key_pressed;
};
struct dw2102_rc_keys {
	u32 keycode;
	u32 event;
};

DVB_DEFINE_MOD_OPT_ADAPTER_NR(adapter_nr);

static int dw2102_op_rw(struct usb_device *dev, u8 request, u16 value,
		u8 *data, u16 len, int flags)
{
	int ret;
	u8 u8buf[len];

	unsigned int pipe = (flags == DW2102_READ_MSG) ?
		usb_rcvctrlpipe(dev, 0) : usb_sndctrlpipe(dev, 0);
	u8 request_type = (flags == DW2102_READ_MSG) ? USB_DIR_IN : USB_DIR_OUT;

	if (flags == DW2102_WRITE_MSG)
		memcpy(u8buf, data, len);
	ret = usb_control_msg(dev, pipe, request,
		request_type | USB_TYPE_VENDOR, value, 0 , u8buf, len, 2000);

	if (flags == DW2102_READ_MSG)
		memcpy(data, u8buf, len);
	return ret;
}

/* I2C */

static int dw2102_i2c_transfer(struct i2c_adapter *adap, struct i2c_msg msg[],
		int num)
{
struct dvb_usb_device *d = i2c_get_adapdata(adap);
	int i = 0, ret = 0;
	u8 buf6[] = {0x2c, 0x05, 0xc0, 0, 0, 0, 0};
	u8 request;
	u16 value;

	if (!d)
		return -ENODEV;
	if (mutex_lock_interruptible(&d->i2c_mutex) < 0)
		return -EAGAIN;

	switch (num) {
	case 2:
		/* read stv0299 register */
		request = 0xb5;
		value = msg[0].buf[0];/* register */
		for (i = 0; i < msg[1].len; i++) {
			value = value + i;
			ret = dw2102_op_rw(d->udev, 0xb5,
				value, buf6, 2, DW2102_READ_MSG);
			msg[1].buf[i] = buf6[0];

		}
		break;
	case 1:
		switch (msg[0].addr) {
		case 0x68:
			/* write to stv0299 register */
			buf6[0] = 0x2a;
			buf6[1] = msg[0].buf[0];
			buf6[2] = msg[0].buf[1];
			ret = dw2102_op_rw(d->udev, 0xb2,
				0, buf6, 3, DW2102_WRITE_MSG);
			break;
		case 0x60:
			if (msg[0].flags == 0) {
			/* write to tuner pll */
				buf6[0] = 0x2c;
				buf6[1] = 5;
				buf6[2] = 0xc0;
				buf6[3] = msg[0].buf[0];
				buf6[4] = msg[0].buf[1];
				buf6[5] = msg[0].buf[2];
				buf6[6] = msg[0].buf[3];
				ret = dw2102_op_rw(d->udev, 0xb2,
				0, buf6, 7, DW2102_WRITE_MSG);
			} else {
			/* write to tuner pll */
				ret = dw2102_op_rw(d->udev, 0xb5,
				0, buf6, 1, DW2102_READ_MSG);
				msg[0].buf[0] = buf6[0];
			}
			break;
		case (DW2102_RC_QUERY):
			ret  = dw2102_op_rw(d->udev, 0xb8,
				0, buf6, 2, DW2102_READ_MSG);
			msg[0].buf[0] = buf6[0];
			msg[0].buf[1] = buf6[1];
			break;
		case (DW2102_VOLTAGE_CTRL):
			buf6[0] = 0x30;
			buf6[1] = msg[0].buf[0];
			ret = dw2102_op_rw(d->udev, 0xb2,
				0, buf6, 2, DW2102_WRITE_MSG);
			break;
		}

		break;
	}

	mutex_unlock(&d->i2c_mutex);
	return num;
}

static u32 dw2102_i2c_func(struct i2c_adapter *adapter)
{
	return I2C_FUNC_I2C;
}

static struct i2c_algorithm dw2102_i2c_algo = {
	.master_xfer = dw2102_i2c_transfer,
	.functionality = dw2102_i2c_func,
};

static int dw2102_set_voltage(struct dvb_frontend *fe, fe_sec_voltage_t voltage)
{
	static u8 command_13v[1] = {0x00};
	static u8 command_18v[1] = {0x01};
	struct i2c_msg msg[] = {
		{.addr = DW2102_VOLTAGE_CTRL, .flags = 0,
			.buf = command_13v, .len = 1},
	};

	struct dvb_usb_adapter *udev_adap =
		(struct dvb_usb_adapter *)(fe->dvb->priv);
	if (voltage == SEC_VOLTAGE_18)
		msg[0].buf = command_18v;
	i2c_transfer(&udev_adap->dev->i2c_adap, msg, 1);
	return 0;
}

static int dw2102_frontend_attach(struct dvb_usb_adapter *d)
{
	d->fe = dvb_attach(stv0299_attach, &sharp_z0194a_config,
		&d->dev->i2c_adap);
	if (d->fe != NULL) {
		d->fe->ops.set_voltage = dw2102_set_voltage;
		info("Attached stv0299!\n");
		return 0;
	}
	return -EIO;
}

static int dw2102_tuner_attach(struct dvb_usb_adapter *adap)
{
	dvb_attach(dvb_pll_attach, adap->fe, 0x60,
		&adap->dev->i2c_adap, DVB_PLL_OPERA1);
	return 0;
}

static struct dvb_usb_rc_key dw2102_rc_keys[] = {
	{ 0xf8,	0x0a, KEY_Q },		/*power*/
	{ 0xf8,	0x0c, KEY_M },		/*mute*/
	{ 0xf8,	0x11, KEY_1 },
	{ 0xf8,	0x12, KEY_2 },
	{ 0xf8,	0x13, KEY_3 },
	{ 0xf8,	0x14, KEY_4 },
	{ 0xf8,	0x15, KEY_5 },
	{ 0xf8,	0x16, KEY_6 },
	{ 0xf8,	0x17, KEY_7 },
	{ 0xf8,	0x18, KEY_8 },
	{ 0xf8,	0x19, KEY_9 },
	{ 0xf8, 0x10, KEY_0 },
	{ 0xf8, 0x1c, KEY_PAGEUP },	/*ch+*/
	{ 0xf8, 0x0f, KEY_PAGEDOWN },	/*ch-*/
	{ 0xf8, 0x1a, KEY_O },		/*vol+*/
	{ 0xf8, 0x0e, KEY_Z },		/*vol-*/
	{ 0xf8, 0x04, KEY_R },		/*rec*/
	{ 0xf8, 0x09, KEY_D },		/*fav*/
	{ 0xf8, 0x08, KEY_BACKSPACE },	/*rewind*/
	{ 0xf8, 0x07, KEY_A },		/*fast*/
	{ 0xf8, 0x0b, KEY_P },		/*pause*/
	{ 0xf8, 0x02, KEY_ESC },	/*cancel*/
	{ 0xf8, 0x03, KEY_G },		/*tab*/
	{ 0xf8, 0x00, KEY_UP },		/*up*/
	{ 0xf8, 0x1f, KEY_ENTER },	/*ok*/
	{ 0xf8, 0x01, KEY_DOWN },	/*down*/
	{ 0xf8, 0x05, KEY_C },		/*cap*/
	{ 0xf8, 0x06, KEY_S },		/*stop*/
	{ 0xf8, 0x40, KEY_F },		/*full*/
	{ 0xf8, 0x1e, KEY_W },		/*tvmode*/
	{ 0xf8, 0x1b, KEY_B },		/*recall*/

};



static int dw2102_rc_query(struct dvb_usb_device *d, u32 *event, int *state)
{
	struct dw2102_state *st = d->priv;
	u8 key[2];
	struct i2c_msg msg[] = {
		{.addr = DW2102_RC_QUERY, .flags = I2C_M_RD, .buf = key,
		.len = 2},
	};
	int i;

	*state = REMOTE_NO_KEY_PRESSED;
	if (dw2102_i2c_transfer(&d->i2c_adap, msg, 1) == 1) {
		for (i = 0; i < ARRAY_SIZE(dw2102_rc_keys); i++) {
			if (dw2102_rc_keys[i].data == msg[0].buf[0]) {
				*state = REMOTE_KEY_PRESSED;
				*event = dw2102_rc_keys[i].event;
				st->last_key_pressed =
					dw2102_rc_keys[i].event;
				break;
			}
		st->last_key_pressed = 0;
		}
	}
	/* info("key: %x %x\n",key[0],key[1]); */
	return 0;
}

static struct usb_device_id dw2102_table[] = {
	{USB_DEVICE(USB_VID_CYPRESS, USB_PID_DW2102)},
	{USB_DEVICE(USB_VID_CYPRESS, 0x2101)},
	{ }
};

MODULE_DEVICE_TABLE(usb, dw2102_table);

static int dw2102_load_firmware(struct usb_device *dev,
			const struct firmware *frmwr)
{
	u8 *b, *p;
	int ret = 0, i;
	u8 reset;
	u8 reset16 [] = {0, 0, 0, 0, 0, 0, 0};
	const struct firmware *fw;
	const char *filename = "dvb-usb-dw2101.fw";
	switch (dev->descriptor.idProduct) {
	case 0x2101:
		ret = request_firmware(&fw, filename, &dev->dev);
		if (ret != 0) {
			err("did not find the firmware file. (%s) "
			"Please see linux/Documentation/dvb/ for more details "
			"on firmware-problems.", filename);
			return ret;
		}
		break;
	case USB_PID_DW2102:
		fw = frmwr;
		break;
	}
	info("start downloading DW2102 firmware");
	p = kmalloc(fw->size, GFP_KERNEL);
	reset = 1;
	/*stop the CPU*/
	dw2102_op_rw(dev, 0xa0, 0x7f92, &reset, 1, DW2102_WRITE_MSG);
	dw2102_op_rw(dev, 0xa0, 0xe600, &reset, 1, DW2102_WRITE_MSG);

	if (p != NULL) {
		memcpy(p, fw->data, fw->size);
		for (i = 0; i < fw->size; i += 0x40) {
			b = (u8 *) p + i;
			if (dw2102_op_rw
				(dev, 0xa0, i, b , 0x40,
					DW2102_WRITE_MSG) != 0x40
				) {
				err("error while transferring firmware");
				ret = -EINVAL;
				break;
			}
		}
		/* restart the CPU */
		reset = 0;
		if (ret || dw2102_op_rw
			(dev, 0xa0, 0x7f92, &reset, 1,
			DW2102_WRITE_MSG) != 1) {
			err("could not restart the USB controller CPU.");
			ret = -EINVAL;
		}
		if (ret || dw2102_op_rw
			(dev, 0xa0, 0xe600, &reset, 1,
			DW2102_WRITE_MSG) != 1) {
			err("could not restart the USB controller CPU.");
			ret = -EINVAL;
		}
		/* init registers */
		switch (dev->descriptor.idProduct) {
		case USB_PID_DW2102:
			dw2102_op_rw
				(dev, 0xbf, 0x0040, &reset, 0,
				DW2102_WRITE_MSG);
			dw2102_op_rw
				(dev, 0xb9, 0x0000, &reset16[0], 2,
				DW2102_READ_MSG);
			break;
		case 0x2101:
			dw2102_op_rw
				(dev, 0xbc, 0x0030, &reset16[0], 2,
				DW2102_READ_MSG);
			dw2102_op_rw
				(dev, 0xba, 0x0000, &reset16[0], 7,
				DW2102_READ_MSG);
			dw2102_op_rw
				(dev, 0xba, 0x0000, &reset16[0], 7,
				DW2102_READ_MSG);
			dw2102_op_rw
				(dev, 0xb9, 0x0000, &reset16[0], 2,
				DW2102_READ_MSG);
			break;
		}
		kfree(p);
	}
	return ret;
}

static struct dvb_usb_device_properties dw2102_properties = {
	.caps = DVB_USB_IS_AN_I2C_ADAPTER,
	.usb_ctrl = DEVICE_SPECIFIC,
	.firmware = "dvb-usb-dw2102.fw",
	.size_of_priv = sizeof(struct dw2102_state),
	.no_reconnect = 1,

	.i2c_algo = &dw2102_i2c_algo,
	.rc_key_map = dw2102_rc_keys,
	.rc_key_map_size = ARRAY_SIZE(dw2102_rc_keys),
	.rc_interval = 150,
	.rc_query = dw2102_rc_query,

	.generic_bulk_ctrl_endpoint = 0x81,
	/* parameter for the MPEG2-data transfer */
	.num_adapters = 1,
	.download_firmware = dw2102_load_firmware,
	.adapter = {
		{
			.frontend_attach = dw2102_frontend_attach,
			.streaming_ctrl = NULL,
			.tuner_attach = dw2102_tuner_attach,
			.stream = {
				.type = USB_BULK,
				.count = 8,
				.endpoint = 0x82,
				.u = {
					.bulk = {
						.buffersize = 4096,
					}
				}
			},
		}
	},
	.num_device_descs = 2,
	.devices = {
		{"DVBWorld DVB-S 2102 USB2.0",
			{&dw2102_table[0], NULL},
			{NULL},
		},
		{"DVBWorld DVB-S 2101 USB2.0",
			{&dw2102_table[1], NULL},
			{NULL},
		},
	}
};

static int dw2102_probe(struct usb_interface *intf,
		const struct usb_device_id *id)
{
	return dvb_usb_device_init(intf, &dw2102_properties,
		THIS_MODULE, NULL, adapter_nr);
}

static struct usb_driver dw2102_driver = {
	.name = "dw2102",
	.probe = dw2102_probe,
	.disconnect = dvb_usb_device_exit,
	.id_table = dw2102_table,
};

static int __init dw2102_module_init(void)
{
	int ret =  usb_register(&dw2102_driver);
	if (ret)
		err("usb_register failed. Error number %d", ret);

	return ret;
}

static void __exit dw2102_module_exit(void)
{
	usb_deregister(&dw2102_driver);
}

module_init(dw2102_module_init);
module_exit(dw2102_module_exit);

MODULE_AUTHOR("Igor M. Liplianin (c) liplianin@me.by");
MODULE_DESCRIPTION("Driver for DVBWorld DVB-S 2101 2102 USB2.0 device");
MODULE_VERSION("0.1");
MODULE_LICENSE("GPL");