[linux-block.git] / drivers / media / usb / cx231xx / cx231xx-i2c.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
   cx231xx-i2c.c - driver for Conexant Cx23100/101/102 USB video capture devices

   Copyright (C) 2008 <srinivasa.deevi at conexant dot com>
		Based on em28xx driver
		Based on Cx23885 driver

 */

#include "cx231xx.h"
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/i2c.h>
#include <linux/i2c-mux.h>
#include <media/v4l2-common.h>
#include <media/tuner.h>


/* ----------------------------------------------------------- */

static unsigned int i2c_scan;
module_param(i2c_scan, int, 0444);
MODULE_PARM_DESC(i2c_scan, "scan i2c bus at insmod time");

static unsigned int i2c_debug;
module_param(i2c_debug, int, 0644);
MODULE_PARM_DESC(i2c_debug, "enable debug messages [i2c]");

#define dprintk1(lvl, fmt, args...)			\
do {							\
	if (i2c_debug >= lvl) {				\
		printk(fmt, ##args);			\
		}					\
} while (0)

#define dprintk2(lvl, fmt, args...)			\
do {							\
	if (i2c_debug >= lvl) {				\
		printk(KERN_DEBUG "%s at %s: " fmt,	\
		       dev->name, __func__ , ##args);	\
      }							\
} while (0)

static inline int get_real_i2c_port(struct cx231xx *dev, int bus_nr)
{
	if (bus_nr == 1)
		return dev->port_3_switch_enabled ? I2C_1_MUX_3 : I2C_1_MUX_1;
	return bus_nr;
}

static inline bool is_tuner(struct cx231xx *dev, struct cx231xx_i2c *bus,
			const struct i2c_msg *msg, int tuner_type)
{
	int i2c_port = get_real_i2c_port(dev, bus->nr);

	if (i2c_port != dev->board.tuner_i2c_master)
		return false;

	if (msg->addr != dev->board.tuner_addr)
		return false;

	if (dev->tuner_type != tuner_type)
		return false;

	return true;
}

/*
 * cx231xx_i2c_send_bytes()
 */
static int cx231xx_i2c_send_bytes(struct i2c_adapter *i2c_adap,
				  const struct i2c_msg *msg)
{
	struct cx231xx_i2c *bus = i2c_adap->algo_data;
	struct cx231xx *dev = bus->dev;
	struct cx231xx_i2c_xfer_data req_data;
	int status = 0;
	u16 size = 0;
	u8 loop = 0;
	u8 saddr_len = 1;
	u8 *buf_ptr = NULL;
	u16 saddr = 0;
	u8 need_gpio = 0;

	if (is_tuner(dev, bus, msg, TUNER_XC5000)) {
		size = msg->len;

		if (size == 2) {	/* register write sub addr */
			/* Just writing sub address will cause problem
			* to XC5000. So ignore the request */
			return 0;
		} else if (size == 4) {	/* register write with sub addr */
			if (msg->len >= 2)
				saddr = msg->buf[0] << 8 | msg->buf[1];
			else if (msg->len == 1)
				saddr = msg->buf[0];

			switch (saddr) {
			case 0x0000:	/* start tuner calibration mode */
				need_gpio = 1;
				/* FW Loading is done */
				dev->xc_fw_load_done = 1;
				break;
			case 0x000D:	/* Set signal source */
			case 0x0001:	/* Set TV standard - Video */
			case 0x0002:	/* Set TV standard - Audio */
			case 0x0003:	/* Set RF Frequency */
				need_gpio = 1;
				break;
			default:
				if (dev->xc_fw_load_done)
					need_gpio = 1;
				break;
			}

			if (need_gpio) {
				dprintk1(1,
				"GPIO WRITE: addr 0x%x, len %d, saddr 0x%x\n",
				msg->addr, msg->len, saddr);

				return dev->cx231xx_gpio_i2c_write(dev,
								   msg->addr,
								   msg->buf,
								   msg->len);
			}
		}

		/* special case for Xc5000 tuner case */
		saddr_len = 1;

		/* adjust the length to correct length */
		size -= saddr_len;
		buf_ptr = (u8 *) (msg->buf + 1);

		do {
			/* prepare xfer_data struct */
			req_data.dev_addr = msg->addr;
			req_data.direction = msg->flags;
			req_data.saddr_len = saddr_len;
			req_data.saddr_dat = msg->buf[0];
			req_data.buf_size = size > 16 ? 16 : size;
			req_data.p_buffer = (u8 *) (buf_ptr + loop * 16);

			bus->i2c_nostop = (size > 16) ? 1 : 0;
			bus->i2c_reserve = (loop == 0) ? 0 : 1;

			/* usb send command */
			status = dev->cx231xx_send_usb_command(bus, &req_data);
			loop++;

			if (size >= 16)
				size -= 16;
			else
				size = 0;

		} while (size > 0);

		bus->i2c_nostop = 0;
		bus->i2c_reserve = 0;

	} else {		/* regular case */

		/* prepare xfer_data struct */
		req_data.dev_addr = msg->addr;
		req_data.direction = msg->flags;
		req_data.saddr_len = 0;
		req_data.saddr_dat = 0;
		req_data.buf_size = msg->len;
		req_data.p_buffer = msg->buf;

		/* usb send command */
		status = dev->cx231xx_send_usb_command(bus, &req_data);
	}

	return status < 0 ? status : 0;
}

/*
 * cx231xx_i2c_recv_bytes()
 * read a byte from the i2c device
 */
static int cx231xx_i2c_recv_bytes(struct i2c_adapter *i2c_adap,
				  const struct i2c_msg *msg)
{
	struct cx231xx_i2c *bus = i2c_adap->algo_data;
	struct cx231xx *dev = bus->dev;
	struct cx231xx_i2c_xfer_data req_data;
	int status = 0;
	u16 saddr = 0;
	u8 need_gpio = 0;

	if (is_tuner(dev, bus, msg, TUNER_XC5000)) {
		if (msg->len == 2)
			saddr = msg->buf[0] << 8 | msg->buf[1];
		else if (msg->len == 1)
			saddr = msg->buf[0];

		if (dev->xc_fw_load_done) {

			switch (saddr) {
			case 0x0009:	/* BUSY check */
				dprintk1(1,
				"GPIO R E A D: Special case BUSY check \n");
				/*Try read BUSY register, just set it to zero*/
				msg->buf[0] = 0;
				if (msg->len == 2)
					msg->buf[1] = 0;
				return 0;
			case 0x0004:	/* read Lock status */
				need_gpio = 1;
				break;

			}

			if (need_gpio) {
				/* this is a special case to handle Xceive tuner
				clock stretch issue with gpio based I2C */

				dprintk1(1,
				"GPIO R E A D: addr 0x%x, len %d, saddr 0x%x\n",
				msg->addr, msg->len,
				msg->buf[0] << 8 | msg->buf[1]);

				status =
				    dev->cx231xx_gpio_i2c_write(dev, msg->addr,
								msg->buf,
								msg->len);
				status =
				    dev->cx231xx_gpio_i2c_read(dev, msg->addr,
							       msg->buf,
							       msg->len);
				return status;
			}
		}

		/* prepare xfer_data struct */
		req_data.dev_addr = msg->addr;
		req_data.direction = msg->flags;
		req_data.saddr_len = msg->len;
		req_data.saddr_dat = msg->buf[0] << 8 | msg->buf[1];
		req_data.buf_size = msg->len;
		req_data.p_buffer = msg->buf;

		/* usb send command */
		status = dev->cx231xx_send_usb_command(bus, &req_data);

	} else {

		/* prepare xfer_data struct */
		req_data.dev_addr = msg->addr;
		req_data.direction = msg->flags;
		req_data.saddr_len = 0;
		req_data.saddr_dat = 0;
		req_data.buf_size = msg->len;
		req_data.p_buffer = msg->buf;

		/* usb send command */
		status = dev->cx231xx_send_usb_command(bus, &req_data);
	}

	return status < 0 ? status : 0;
}

/*
 * cx231xx_i2c_recv_bytes_with_saddr()
 * read a byte from the i2c device
 */
static int cx231xx_i2c_recv_bytes_with_saddr(struct i2c_adapter *i2c_adap,
					     const struct i2c_msg *msg1,
					     const struct i2c_msg *msg2)
{
	struct cx231xx_i2c *bus = i2c_adap->algo_data;
	struct cx231xx *dev = bus->dev;
	struct cx231xx_i2c_xfer_data req_data;
	int status = 0;
	u16 saddr = 0;
	u8 need_gpio = 0;

	if (msg1->len == 2)
		saddr = msg1->buf[0] << 8 | msg1->buf[1];
	else if (msg1->len == 1)
		saddr = msg1->buf[0];

	if (is_tuner(dev, bus, msg2, TUNER_XC5000)) {
		if ((msg2->len < 16)) {

			dprintk1(1,
			"i2c_read: addr 0x%x, len %d, saddr 0x%x, len %d\n",
			msg2->addr, msg2->len, saddr, msg1->len);

			switch (saddr) {
			case 0x0008:	/* read FW load status */
				need_gpio = 1;
				break;
			case 0x0004:	/* read Lock status */
				need_gpio = 1;
				break;
			}

			if (need_gpio) {
				status =
				    dev->cx231xx_gpio_i2c_write(dev, msg1->addr,
								msg1->buf,
								msg1->len);
				status =
				    dev->cx231xx_gpio_i2c_read(dev, msg2->addr,
							       msg2->buf,
							       msg2->len);
				return status;
			}
		}
	}

	/* prepare xfer_data struct */
	req_data.dev_addr = msg2->addr;
	req_data.direction = msg2->flags;
	req_data.saddr_len = msg1->len;
	req_data.saddr_dat = saddr;
	req_data.buf_size = msg2->len;
	req_data.p_buffer = msg2->buf;

	/* usb send command */
	status = dev->cx231xx_send_usb_command(bus, &req_data);

	return status < 0 ? status : 0;
}

/*
 * cx231xx_i2c_check_for_device()
 * check if there is a i2c_device at the supplied address
 */
static int cx231xx_i2c_check_for_device(struct i2c_adapter *i2c_adap,
					const struct i2c_msg *msg)
{
	struct cx231xx_i2c *bus = i2c_adap->algo_data;
	struct cx231xx *dev = bus->dev;
	struct cx231xx_i2c_xfer_data req_data;
	int status = 0;
	u8 buf[1];

	/* prepare xfer_data struct */
	req_data.dev_addr = msg->addr;
	req_data.direction = I2C_M_RD;
	req_data.saddr_len = 0;
	req_data.saddr_dat = 0;
	req_data.buf_size = 1;
	req_data.p_buffer = buf;

	/* usb send command */
	status = dev->cx231xx_send_usb_command(bus, &req_data);

	return status < 0 ? status : 0;
}

/*
 * cx231xx_i2c_xfer()
 * the main i2c transfer function
 */
static int cx231xx_i2c_xfer(struct i2c_adapter *i2c_adap,
			    struct i2c_msg msgs[], int num)
{
	struct cx231xx_i2c *bus = i2c_adap->algo_data;
	struct cx231xx *dev = bus->dev;
	int addr, rc, i, byte;

	mutex_lock(&dev->i2c_lock);
	for (i = 0; i < num; i++) {

		addr = msgs[i].addr;

		dprintk2(2, "%s %s addr=0x%x len=%d:",
			 (msgs[i].flags & I2C_M_RD) ? "read" : "write",
			 i == num - 1 ? "stop" : "nonstop", addr, msgs[i].len);
		if (!msgs[i].len) {
			/* no len: check only for device presence */
			rc = cx231xx_i2c_check_for_device(i2c_adap, &msgs[i]);
			if (rc < 0) {
				dprintk2(2, " no device\n");
				mutex_unlock(&dev->i2c_lock);
				return rc;
			}

		} else if (msgs[i].flags & I2C_M_RD) {
			/* read bytes */
			rc = cx231xx_i2c_recv_bytes(i2c_adap, &msgs[i]);
			if (i2c_debug >= 2) {
				for (byte = 0; byte < msgs[i].len; byte++)
					printk(KERN_CONT " %02x", msgs[i].buf[byte]);
			}
		} else if (i + 1 < num && (msgs[i + 1].flags & I2C_M_RD) &&
			   msgs[i].addr == msgs[i + 1].addr
			   && (msgs[i].len <= 2) && (bus->nr < 3)) {
			/* write bytes */
			if (i2c_debug >= 2) {
				for (byte = 0; byte < msgs[i].len; byte++)
					printk(KERN_CONT " %02x", msgs[i].buf[byte]);
				printk(KERN_CONT "\n");
			}
			/* read bytes */
			dprintk2(2, "plus %s %s addr=0x%x len=%d:",
				(msgs[i+1].flags & I2C_M_RD) ? "read" : "write",
				i+1 == num - 1 ? "stop" : "nonstop", addr, msgs[i+1].len);
			rc = cx231xx_i2c_recv_bytes_with_saddr(i2c_adap,
							       &msgs[i],
							       &msgs[i + 1]);
			if (i2c_debug >= 2) {
				for (byte = 0; byte < msgs[i+1].len; byte++)
					printk(KERN_CONT " %02x", msgs[i+1].buf[byte]);
			}
			i++;
		} else {
			/* write bytes */
			if (i2c_debug >= 2) {
				for (byte = 0; byte < msgs[i].len; byte++)
					printk(KERN_CONT " %02x", msgs[i].buf[byte]);
			}
			rc = cx231xx_i2c_send_bytes(i2c_adap, &msgs[i]);
		}
		if (rc < 0)
			goto err;
		if (i2c_debug >= 2)
			printk(KERN_CONT "\n");
	}
	mutex_unlock(&dev->i2c_lock);
	return num;
err:
	dprintk2(2, " ERROR: %i\n", rc);
	mutex_unlock(&dev->i2c_lock);
	return rc;
}

/* ----------------------------------------------------------- */

/*
 * functionality()
 */
static u32 functionality(struct i2c_adapter *adap)
{
	return I2C_FUNC_SMBUS_EMUL | I2C_FUNC_I2C;
}

static const struct i2c_algorithm cx231xx_algo = {
	.master_xfer = cx231xx_i2c_xfer,
	.functionality = functionality,
};

static const struct i2c_adapter cx231xx_adap_template = {
	.owner = THIS_MODULE,
	.name = "cx231xx",
	.algo = &cx231xx_algo,
};

/* ----------------------------------------------------------- */

/*
 * i2c_devs
 * incomplete list of known devices
 */
static const char *i2c_devs[128] = {
	[0x20 >> 1] = "demod",
	[0x60 >> 1] = "colibri",
	[0x88 >> 1] = "hammerhead",
	[0x8e >> 1] = "CIR",
	[0x32 >> 1] = "GeminiIII",
	[0x02 >> 1] = "Aquarius",
	[0xa0 >> 1] = "eeprom",
	[0xc0 >> 1] = "tuner",
	[0xc2 >> 1] = "tuner",
};

/*
 * cx231xx_do_i2c_scan()
 * check i2c address range for devices
 */
void cx231xx_do_i2c_scan(struct cx231xx *dev, int i2c_port)
{
	unsigned char buf;
	int i, rc;
	struct i2c_adapter *adap;
	struct i2c_msg msg = {
		.flags = I2C_M_RD,
		.len = 1,
		.buf = &buf,
	};

	if (!i2c_scan)
		return;

	/* Don't generate I2C errors during scan */
	dev->i2c_scan_running = true;
	adap = cx231xx_get_i2c_adap(dev, i2c_port);

	for (i = 0; i < 128; i++) {
		msg.addr = i;
		rc = i2c_transfer(adap, &msg, 1);

		if (rc < 0)
			continue;
		dev_info(dev->dev,
			 "i2c scan: found device @ port %d addr 0x%x  [%s]\n",
			 i2c_port,
			 i << 1,
			 i2c_devs[i] ? i2c_devs[i] : "???");
	}

	dev->i2c_scan_running = false;
}

/*
 * cx231xx_i2c_register()
 * register i2c bus
 */
int cx231xx_i2c_register(struct cx231xx_i2c *bus)
{
	struct cx231xx *dev = bus->dev;

	if (!dev->cx231xx_send_usb_command)
		return -EINVAL;

	bus->i2c_adap = cx231xx_adap_template;
	bus->i2c_adap.dev.parent = dev->dev;

	snprintf(bus->i2c_adap.name, sizeof(bus->i2c_adap.name), "%s-%d", bus->dev->name, bus->nr);

	bus->i2c_adap.algo_data = bus;
	i2c_set_adapdata(&bus->i2c_adap, &dev->v4l2_dev);
	bus->i2c_rc = i2c_add_adapter(&bus->i2c_adap);

	if (0 != bus->i2c_rc)
		dev_warn(dev->dev,
			 "i2c bus %d register FAILED\n", bus->nr);

	return bus->i2c_rc;
}

/*
 * cx231xx_i2c_unregister()
 * unregister i2c_bus
 */
void cx231xx_i2c_unregister(struct cx231xx_i2c *bus)
{
	if (!bus->i2c_rc)
		i2c_del_adapter(&bus->i2c_adap);
}

/*
 * cx231xx_i2c_mux_select()
 * switch i2c master number 1 between port1 and port3
 */
static int cx231xx_i2c_mux_select(struct i2c_mux_core *muxc, u32 chan_id)
{
	struct cx231xx *dev = i2c_mux_priv(muxc);

	return cx231xx_enable_i2c_port_3(dev, chan_id);
}

int cx231xx_i2c_mux_create(struct cx231xx *dev)
{
	dev->muxc = i2c_mux_alloc(&dev->i2c_bus[1].i2c_adap, dev->dev, 2, 0, 0,
				  cx231xx_i2c_mux_select, NULL);
	if (!dev->muxc)
		return -ENOMEM;
	dev->muxc->priv = dev;
	return 0;
}

int cx231xx_i2c_mux_register(struct cx231xx *dev, int mux_no)
{
	return i2c_mux_add_adapter(dev->muxc, 0, mux_no);
}

void cx231xx_i2c_mux_unregister(struct cx231xx *dev)
{
	i2c_mux_del_adapters(dev->muxc);
}

struct i2c_adapter *cx231xx_get_i2c_adap(struct cx231xx *dev, int i2c_port)
{
	switch (i2c_port) {
	case I2C_0:
		return &dev->i2c_bus[0].i2c_adap;
	case I2C_1:
		return &dev->i2c_bus[1].i2c_adap;
	case I2C_2:
		return &dev->i2c_bus[2].i2c_adap;
	case I2C_1_MUX_1:
		return dev->muxc->adapter[0];
	case I2C_1_MUX_3:
		return dev->muxc->adapter[1];
	default:
		BUG();
	}
}
EXPORT_SYMBOL_GPL(cx231xx_get_i2c_adap);
Commit	Line	Data
74ba9207	1	// SPDX-License-Identifier: GPL-2.0-or-later
e0d3bafd SD	2	/*
	3	cx231xx-i2c.c - driver for Conexant Cx23100/101/102 USB video capture devices
	4
	5	Copyright (C) 2008 <srinivasa.deevi at conexant dot com>
b9255176 SD	6	Based on em28xx driver
b9255176 SD	7	Based on Cx23885 driver
e0d3bafd	8
e0d3bafd SD	9	*/
e0d3bafd SD	10
589dadf2	11	#include "cx231xx.h"
e0d3bafd SD	12	#include <linux/module.h>
e0d3bafd SD	13	#include <linux/kernel.h>
e0d3bafd	14	#include <linux/i2c.h>
15c212dd	15	#include <linux/i2c-mux.h>
e0d3bafd SD	16	#include <media/v4l2-common.h>
	17	#include <media/tuner.h>
	18
e0d3bafd	19
e0d3bafd SD	20	/* ----------------------------------------------------------- */
	21
	22	static unsigned int i2c_scan;
	23	module_param(i2c_scan, int, 0444);
	24	MODULE_PARM_DESC(i2c_scan, "scan i2c bus at insmod time");
	25
	26	static unsigned int i2c_debug;
	27	module_param(i2c_debug, int, 0644);
	28	MODULE_PARM_DESC(i2c_debug, "enable debug messages [i2c]");
	29
e0d3bafd SD	30	#define dprintk1(lvl, fmt, args...) \
	31	do { \
	32	if (i2c_debug >= lvl) { \
6e4f574b SD	33	printk(fmt, ##args); \
6e4f574b SD	34	} \
e0d3bafd SD	35	} while (0)
	36
	37	#define dprintk2(lvl, fmt, args...) \
	38	do { \
	39	if (i2c_debug >= lvl) { \
	40	printk(KERN_DEBUG "%s at %s: " fmt, \
	41	dev->name, __func__ , ##args); \
6e6a8b5a	42	} \
e0d3bafd SD	43	} while (0)
e0d3bafd SD	44
8a025348 MS	45	static inline int get_real_i2c_port(struct cx231xx *dev, int bus_nr)
	46	{
	47	if (bus_nr == 1)
	48	return dev->port_3_switch_enabled ? I2C_1_MUX_3 : I2C_1_MUX_1;
	49	return bus_nr;
	50	}
	51
3f25ffa2 MCC	52	static inline bool is_tuner(struct cx231xx dev, struct cx231xx_i2c bus,
	53	const struct i2c_msg *msg, int tuner_type)
	54	{
8a025348 MS	55	int i2c_port = get_real_i2c_port(dev, bus->nr);
	56
	57	if (i2c_port != dev->board.tuner_i2c_master)
3f25ffa2 MCC	58	return false;
	59
	60	if (msg->addr != dev->board.tuner_addr)
	61	return false;
	62
	63	if (dev->tuner_type != tuner_type)
	64	return false;
	65
	66	return true;
	67	}
	68
e0d3bafd SD	69	/*
	70	* cx231xx_i2c_send_bytes()
	71	*/
d4c06133 MCC	72	static int cx231xx_i2c_send_bytes(struct i2c_adapter *i2c_adap,
d4c06133 MCC	73	const struct i2c_msg *msg)
e0d3bafd SD	74	{
	75	struct cx231xx_i2c *bus = i2c_adap->algo_data;
	76	struct cx231xx *dev = bus->dev;
84b5dbf3 MCC	77	struct cx231xx_i2c_xfer_data req_data;
	78	int status = 0;
	79	u16 size = 0;
	80	u8 loop = 0;
	81	u8 saddr_len = 1;
	82	u8 *buf_ptr = NULL;
	83	u16 saddr = 0;
	84	u8 need_gpio = 0;
	85
3f25ffa2	86	if (is_tuner(dev, bus, msg, TUNER_XC5000)) {
84b5dbf3 MCC	87	size = msg->len;
	88
	89	if (size == 2) { /* register write sub addr */
6e4f574b SD	90	/* Just writing sub address will cause problem
6e4f574b SD	91	* to XC5000. So ignore the request */
84b5dbf3	92	return 0;
84b5dbf3	93	} else if (size == 4) { /* register write with sub addr */
84b5dbf3 MCC	94	if (msg->len >= 2)
	95	saddr = msg->buf[0] << 8 \| msg->buf[1];
	96	else if (msg->len == 1)
	97	saddr = msg->buf[0];
	98
	99	switch (saddr) {
	100	case 0x0000: /* start tuner calibration mode */
	101	need_gpio = 1;
b9255176 SD	102	/* FW Loading is done */
b9255176 SD	103	dev->xc_fw_load_done = 1;
84b5dbf3 MCC	104	break;
	105	case 0x000D: /* Set signal source */
	106	case 0x0001: /* Set TV standard - Video */
	107	case 0x0002: /* Set TV standard - Audio */
	108	case 0x0003: /* Set RF Frequency */
	109	need_gpio = 1;
	110	break;
	111	default:
	112	if (dev->xc_fw_load_done)
	113	need_gpio = 1;
	114	break;
	115	}
	116
	117	if (need_gpio) {
	118	dprintk1(1,
b9255176 SD	119	"GPIO WRITE: addr 0x%x, len %d, saddr 0x%x\n",
b9255176 SD	120	msg->addr, msg->len, saddr);
84b5dbf3 MCC	121
	122	return dev->cx231xx_gpio_i2c_write(dev,
	123	msg->addr,
	124	msg->buf,
	125	msg->len);
	126	}
84b5dbf3 MCC	127	}
	128
	129	/* special case for Xc5000 tuner case */
	130	saddr_len = 1;
	131
	132	/* adjust the length to correct length */
	133	size -= saddr_len;
	134	buf_ptr = (u8 *) (msg->buf + 1);
	135
	136	do {
	137	/* prepare xfer_data struct */
	138	req_data.dev_addr = msg->addr;
	139	req_data.direction = msg->flags;
	140	req_data.saddr_len = saddr_len;
	141	req_data.saddr_dat = msg->buf[0];
	142	req_data.buf_size = size > 16 ? 16 : size;
	143	req_data.p_buffer = (u8 ) (buf_ptr + loop 16);
	144
	145	bus->i2c_nostop = (size > 16) ? 1 : 0;
	146	bus->i2c_reserve = (loop == 0) ? 0 : 1;
	147
	148	/* usb send command */
	149	status = dev->cx231xx_send_usb_command(bus, &req_data);
	150	loop++;
	151
	152	if (size >= 16)
	153	size -= 16;
	154	else
	155	size = 0;
	156
	157	} while (size > 0);
	158
	159	bus->i2c_nostop = 0;
	160	bus->i2c_reserve = 0;
	161
	162	} else { /* regular case */
	163
	164	/* prepare xfer_data struct */
	165	req_data.dev_addr = msg->addr;
	166	req_data.direction = msg->flags;
	167	req_data.saddr_len = 0;
	168	req_data.saddr_dat = 0;
	169	req_data.buf_size = msg->len;
	170	req_data.p_buffer = msg->buf;
	171
	172	/* usb send command */
	173	status = dev->cx231xx_send_usb_command(bus, &req_data);
	174	}
	175
	176	return status < 0 ? status : 0;
e0d3bafd SD	177	}
	178
	179	/*
	180	* cx231xx_i2c_recv_bytes()
	181	* read a byte from the i2c device
	182	*/
	183	static int cx231xx_i2c_recv_bytes(struct i2c_adapter *i2c_adap,
84b5dbf3	184	const struct i2c_msg *msg)
e0d3bafd	185	{
84b5dbf3	186	struct cx231xx_i2c *bus = i2c_adap->algo_data;
e0d3bafd	187	struct cx231xx *dev = bus->dev;
84b5dbf3 MCC	188	struct cx231xx_i2c_xfer_data req_data;
	189	int status = 0;
	190	u16 saddr = 0;
	191	u8 need_gpio = 0;
	192
3f25ffa2	193	if (is_tuner(dev, bus, msg, TUNER_XC5000)) {
84b5dbf3 MCC	194	if (msg->len == 2)
	195	saddr = msg->buf[0] << 8 \| msg->buf[1];
	196	else if (msg->len == 1)
	197	saddr = msg->buf[0];
	198
	199	if (dev->xc_fw_load_done) {
	200
	201	switch (saddr) {
	202	case 0x0009: /* BUSY check */
	203	dprintk1(1,
b9255176 SD	204	"GPIO R E A D: Special case BUSY check \n");
b9255176 SD	205	/Try read BUSY register, just set it to zero/
84b5dbf3 MCC	206	msg->buf[0] = 0;
	207	if (msg->len == 2)
	208	msg->buf[1] = 0;
	209	return 0;
	210	case 0x0004: /* read Lock status */
	211	need_gpio = 1;
	212	break;
	213
	214	}
	215
	216	if (need_gpio) {
b9255176 SD	217	/* this is a special case to handle Xceive tuner
	218	clock stretch issue with gpio based I2C */
	219
84b5dbf3	220	dprintk1(1,
b9255176 SD	221	"GPIO R E A D: addr 0x%x, len %d, saddr 0x%x\n",
	222	msg->addr, msg->len,
	223	msg->buf[0] << 8 \| msg->buf[1]);
	224
84b5dbf3 MCC	225	status =
	226	dev->cx231xx_gpio_i2c_write(dev, msg->addr,
	227	msg->buf,
	228	msg->len);
	229	status =
	230	dev->cx231xx_gpio_i2c_read(dev, msg->addr,
	231	msg->buf,
	232	msg->len);
	233	return status;
	234	}
	235	}
	236
	237	/* prepare xfer_data struct */
	238	req_data.dev_addr = msg->addr;
	239	req_data.direction = msg->flags;
	240	req_data.saddr_len = msg->len;
	241	req_data.saddr_dat = msg->buf[0] << 8 \| msg->buf[1];
	242	req_data.buf_size = msg->len;
	243	req_data.p_buffer = msg->buf;
	244
	245	/* usb send command */
	246	status = dev->cx231xx_send_usb_command(bus, &req_data);
	247
	248	} else {
	249
	250	/* prepare xfer_data struct */
	251	req_data.dev_addr = msg->addr;
	252	req_data.direction = msg->flags;
	253	req_data.saddr_len = 0;
	254	req_data.saddr_dat = 0;
	255	req_data.buf_size = msg->len;
	256	req_data.p_buffer = msg->buf;
	257
	258	/* usb send command */
	259	status = dev->cx231xx_send_usb_command(bus, &req_data);
	260	}
	261
	262	return status < 0 ? status : 0;
e0d3bafd SD	263	}
	264
	265	/*
	266	* cx231xx_i2c_recv_bytes_with_saddr()
	267	* read a byte from the i2c device
	268	*/
	269	static int cx231xx_i2c_recv_bytes_with_saddr(struct i2c_adapter *i2c_adap,
84b5dbf3 MCC	270	const struct i2c_msg *msg1,
84b5dbf3 MCC	271	const struct i2c_msg *msg2)
e0d3bafd	272	{
84b5dbf3	273	struct cx231xx_i2c *bus = i2c_adap->algo_data;
e0d3bafd	274	struct cx231xx *dev = bus->dev;
84b5dbf3 MCC	275	struct cx231xx_i2c_xfer_data req_data;
	276	int status = 0;
	277	u16 saddr = 0;
	278	u8 need_gpio = 0;
	279
	280	if (msg1->len == 2)
	281	saddr = msg1->buf[0] << 8 \| msg1->buf[1];
	282	else if (msg1->len == 1)
	283	saddr = msg1->buf[0];
	284
3f25ffa2	285	if (is_tuner(dev, bus, msg2, TUNER_XC5000)) {
84b5dbf3 MCC	286	if ((msg2->len < 16)) {
	287
	288	dprintk1(1,
b9255176 SD	289	"i2c_read: addr 0x%x, len %d, saddr 0x%x, len %d\n",
b9255176 SD	290	msg2->addr, msg2->len, saddr, msg1->len);
84b5dbf3 MCC	291
	292	switch (saddr) {
	293	case 0x0008: /* read FW load status */
	294	need_gpio = 1;
	295	break;
	296	case 0x0004: /* read Lock status */
	297	need_gpio = 1;
	298	break;
	299	}
	300
	301	if (need_gpio) {
	302	status =
	303	dev->cx231xx_gpio_i2c_write(dev, msg1->addr,
	304	msg1->buf,
	305	msg1->len);
	306	status =
	307	dev->cx231xx_gpio_i2c_read(dev, msg2->addr,
	308	msg2->buf,
	309	msg2->len);
	310	return status;
	311	}
	312	}
	313	}
	314
	315	/* prepare xfer_data struct */
	316	req_data.dev_addr = msg2->addr;
	317	req_data.direction = msg2->flags;
	318	req_data.saddr_len = msg1->len;
	319	req_data.saddr_dat = saddr;
	320	req_data.buf_size = msg2->len;
	321	req_data.p_buffer = msg2->buf;
	322
	323	/* usb send command */
	324	status = dev->cx231xx_send_usb_command(bus, &req_data);
	325
	326	return status < 0 ? status : 0;
e0d3bafd SD	327	}
	328
	329	/*
	330	* cx231xx_i2c_check_for_device()
	331	* check if there is a i2c_device at the supplied address
	332	*/
	333	static int cx231xx_i2c_check_for_device(struct i2c_adapter *i2c_adap,
84b5dbf3	334	const struct i2c_msg *msg)
e0d3bafd	335	{
84b5dbf3	336	struct cx231xx_i2c *bus = i2c_adap->algo_data;
e0d3bafd	337	struct cx231xx *dev = bus->dev;
84b5dbf3 MCC	338	struct cx231xx_i2c_xfer_data req_data;
84b5dbf3 MCC	339	int status = 0;
0d88d091	340	u8 buf[1];
e0d3bafd	341
84b5dbf3 MCC	342	/* prepare xfer_data struct */
84b5dbf3 MCC	343	req_data.dev_addr = msg->addr;
0d88d091	344	req_data.direction = I2C_M_RD;
84b5dbf3 MCC	345	req_data.saddr_len = 0;
84b5dbf3 MCC	346	req_data.saddr_dat = 0;
0d88d091 MS	347	req_data.buf_size = 1;
0d88d091 MS	348	req_data.p_buffer = buf;
e0d3bafd	349
84b5dbf3 MCC	350	/* usb send command */
84b5dbf3 MCC	351	status = dev->cx231xx_send_usb_command(bus, &req_data);
e0d3bafd	352
84b5dbf3	353	return status < 0 ? status : 0;
e0d3bafd SD	354	}
	355
	356	/*
	357	* cx231xx_i2c_xfer()
	358	* the main i2c transfer function
	359	*/
	360	static int cx231xx_i2c_xfer(struct i2c_adapter *i2c_adap,
84b5dbf3	361	struct i2c_msg msgs[], int num)
e0d3bafd SD	362	{
	363	struct cx231xx_i2c *bus = i2c_adap->algo_data;
	364	struct cx231xx *dev = bus->dev;
	365	int addr, rc, i, byte;
	366
64fbf444	367	mutex_lock(&dev->i2c_lock);
e0d3bafd SD	368	for (i = 0; i < num; i++) {
e0d3bafd SD	369
1134e9d1	370	addr = msgs[i].addr;
e0d3bafd	371
1134e9d1	372	dprintk2(2, "%s %s addr=0x%x len=%d:",
e0d3bafd SD	373	(msgs[i].flags & I2C_M_RD) ? "read" : "write",
e0d3bafd SD	374	i == num - 1 ? "stop" : "nonstop", addr, msgs[i].len);
b9255176 SD	375	if (!msgs[i].len) {
b9255176 SD	376	/* no len: check only for device presence */
e0d3bafd SD	377	rc = cx231xx_i2c_check_for_device(i2c_adap, &msgs[i]);
	378	if (rc < 0) {
	379	dprintk2(2, " no device\n");
b8383962	380	mutex_unlock(&dev->i2c_lock);
e0d3bafd SD	381	return rc;
	382	}
	383
	384	} else if (msgs[i].flags & I2C_M_RD) {
	385	/* read bytes */
	386	rc = cx231xx_i2c_recv_bytes(i2c_adap, &msgs[i]);
	387	if (i2c_debug >= 2) {
	388	for (byte = 0; byte < msgs[i].len; byte++)
6f64eb0e	389	printk(KERN_CONT " %02x", msgs[i].buf[byte]);
e0d3bafd SD	390	}
e0d3bafd SD	391	} else if (i + 1 < num && (msgs[i + 1].flags & I2C_M_RD) &&
84b5dbf3	392	msgs[i].addr == msgs[i + 1].addr
64fbf444	393	&& (msgs[i].len <= 2) && (bus->nr < 3)) {
1134e9d1 MS	394	/* write bytes */
	395	if (i2c_debug >= 2) {
	396	for (byte = 0; byte < msgs[i].len; byte++)
6f64eb0e MS	397	printk(KERN_CONT " %02x", msgs[i].buf[byte]);
6f64eb0e MS	398	printk(KERN_CONT "\n");
1134e9d1	399	}
e0d3bafd	400	/* read bytes */
1134e9d1 MS	401	dprintk2(2, "plus %s %s addr=0x%x len=%d:",
	402	(msgs[i+1].flags & I2C_M_RD) ? "read" : "write",
	403	i+1 == num - 1 ? "stop" : "nonstop", addr, msgs[i+1].len);
84b5dbf3 MCC	404	rc = cx231xx_i2c_recv_bytes_with_saddr(i2c_adap,
	405	&msgs[i],
	406	&msgs[i + 1]);
e0d3bafd	407	if (i2c_debug >= 2) {
1134e9d1	408	for (byte = 0; byte < msgs[i+1].len; byte++)
6f64eb0e	409	printk(KERN_CONT " %02x", msgs[i+1].buf[byte]);
e0d3bafd	410	}
84b5dbf3	411	i++;
e0d3bafd SD	412	} else {
	413	/* write bytes */
	414	if (i2c_debug >= 2) {
	415	for (byte = 0; byte < msgs[i].len; byte++)
6f64eb0e	416	printk(KERN_CONT " %02x", msgs[i].buf[byte]);
e0d3bafd	417	}
84b5dbf3	418	rc = cx231xx_i2c_send_bytes(i2c_adap, &msgs[i]);
e0d3bafd SD	419	}
	420	if (rc < 0)
	421	goto err;
	422	if (i2c_debug >= 2)
6f64eb0e	423	printk(KERN_CONT "\n");
e0d3bafd	424	}
64fbf444	425	mutex_unlock(&dev->i2c_lock);
e0d3bafd	426	return num;
b9255176	427	err:
e0d3bafd	428	dprintk2(2, " ERROR: %i\n", rc);
64fbf444	429	mutex_unlock(&dev->i2c_lock);
e0d3bafd SD	430	return rc;
	431	}
	432
	433	/* ----------------------------------------------------------- */
	434
	435	/*
	436	* functionality()
	437	*/
	438	static u32 functionality(struct i2c_adapter *adap)
	439	{
	440	return I2C_FUNC_SMBUS_EMUL \| I2C_FUNC_I2C;
	441	}
	442
78f2c50b	443	static const struct i2c_algorithm cx231xx_algo = {
84b5dbf3	444	.master_xfer = cx231xx_i2c_xfer,
e0d3bafd SD	445	.functionality = functionality,
	446	};
	447
6843868f	448	static const struct i2c_adapter cx231xx_adap_template = {
e0d3bafd	449	.owner = THIS_MODULE,
e0d3bafd	450	.name = "cx231xx",
e0d3bafd	451	.algo = &cx231xx_algo,
e0d3bafd SD	452	};
e0d3bafd SD	453
e0d3bafd SD	454	/* ----------------------------------------------------------- */
	455
	456	/*
	457	* i2c_devs
	458	* incomplete list of known devices
	459	*/
ec2a387e MCC	460	static const char *i2c_devs[128] = {
ec2a387e MCC	461	[0x20 >> 1] = "demod",
e0d3bafd SD	462	[0x60 >> 1] = "colibri",
e0d3bafd SD	463	[0x88 >> 1] = "hammerhead",
84b5dbf3	464	[0x8e >> 1] = "CIR",
e0d3bafd	465	[0x32 >> 1] = "GeminiIII",
84b5dbf3	466	[0x02 >> 1] = "Aquarius",
e0d3bafd	467	[0xa0 >> 1] = "eeprom",
3f25ffa2 MCC	468	[0xc0 >> 1] = "tuner",
3f25ffa2 MCC	469	[0xc2 >> 1] = "tuner",
e0d3bafd SD	470	};
	471
	472	/*
	473	* cx231xx_do_i2c_scan()
	474	* check i2c address range for devices
	475	*/
7c894a3b	476	void cx231xx_do_i2c_scan(struct cx231xx *dev, int i2c_port)
e0d3bafd SD	477	{
	478	unsigned char buf;
	479	int i, rc;
4063987c AB	480	struct i2c_adapter *adap;
	481	struct i2c_msg msg = {
	482	.flags = I2C_M_RD,
	483	.len = 1,
	484	.buf = &buf,
	485	};
e0d3bafd	486
e4de03f2 MS	487	if (!i2c_scan)
	488	return;
	489
77e97ba2 MCC	490	/* Don't generate I2C errors during scan */
77e97ba2 MCC	491	dev->i2c_scan_running = true;
4063987c	492	adap = cx231xx_get_i2c_adap(dev, i2c_port);
7c894a3b	493
e0d3bafd	494	for (i = 0; i < 128; i++) {
4063987c AB	495	msg.addr = i;
	496	rc = i2c_transfer(adap, &msg, 1);
	497
e0d3bafd SD	498	if (rc < 0)
e0d3bafd SD	499	continue;
336fea92	500	dev_info(dev->dev,
ac550faa MCC	501	"i2c scan: found device @ port %d addr 0x%x [%s]\n",
ac550faa MCC	502	i2c_port,
b7085c08 MCC	503	i << 1,
b7085c08 MCC	504	i2c_devs[i] ? i2c_devs[i] : "???");
e0d3bafd	505	}
77e97ba2 MCC	506
77e97ba2 MCC	507	dev->i2c_scan_running = false;
e0d3bafd SD	508	}
e0d3bafd SD	509
e0d3bafd SD	510	/*
	511	* cx231xx_i2c_register()
	512	* register i2c bus
	513	*/
	514	int cx231xx_i2c_register(struct cx231xx_i2c *bus)
	515	{
84b5dbf3	516	struct cx231xx *dev = bus->dev;
e0d3bafd	517
93a24578 AP	518	if (!dev->cx231xx_send_usb_command)
93a24578 AP	519	return -EINVAL;
e0d3bafd	520
23ba641a	521	bus->i2c_adap = cx231xx_adap_template;
336fea92	522	bus->i2c_adap.dev.parent = dev->dev;
e0d3bafd	523
8da4f2d5	524	snprintf(bus->i2c_adap.name, sizeof(bus->i2c_adap.name), "%s-%d", bus->dev->name, bus->nr);
e0d3bafd	525
e0d3bafd	526	bus->i2c_adap.algo_data = bus;
b1196126	527	i2c_set_adapdata(&bus->i2c_adap, &dev->v4l2_dev);
54b1b41f	528	bus->i2c_rc = i2c_add_adapter(&bus->i2c_adap);
e0d3bafd	529
e4de03f2	530	if (0 != bus->i2c_rc)
336fea92	531	dev_warn(dev->dev,
b7085c08	532	"i2c bus %d register FAILED\n", bus->nr);
e0d3bafd SD	533
	534	return bus->i2c_rc;
	535	}
	536
	537	/*
	538	* cx231xx_i2c_unregister()
	539	* unregister i2c_bus
	540	*/
22469022	541	void cx231xx_i2c_unregister(struct cx231xx_i2c *bus)
e0d3bafd	542	{
8e2803ff PR	543	if (!bus->i2c_rc)
8e2803ff PR	544	i2c_del_adapter(&bus->i2c_adap);
e0d3bafd	545	}
c3c3f1ae	546
15c212dd MS	547	/*
	548	* cx231xx_i2c_mux_select()
	549	* switch i2c master number 1 between port1 and port3
	550	*/
05e0dfd0	551	static int cx231xx_i2c_mux_select(struct i2c_mux_core *muxc, u32 chan_id)
15c212dd	552	{
05e0dfd0	553	struct cx231xx *dev = i2c_mux_priv(muxc);
15c212dd MS	554
	555	return cx231xx_enable_i2c_port_3(dev, chan_id);
	556	}
	557
05e0dfd0 PR	558	int cx231xx_i2c_mux_create(struct cx231xx *dev)
	559	{
	560	dev->muxc = i2c_mux_alloc(&dev->i2c_bus[1].i2c_adap, dev->dev, 2, 0, 0,
	561	cx231xx_i2c_mux_select, NULL);
	562	if (!dev->muxc)
	563	return -ENOMEM;
	564	dev->muxc->priv = dev;
	565	return 0;
	566	}
	567
15c212dd MS	568	int cx231xx_i2c_mux_register(struct cx231xx *dev, int mux_no)
15c212dd MS	569	{
fec1982d	570	return i2c_mux_add_adapter(dev->muxc, 0, mux_no);
15c212dd MS	571	}
15c212dd MS	572
05e0dfd0	573	void cx231xx_i2c_mux_unregister(struct cx231xx *dev)
15c212dd	574	{
05e0dfd0	575	i2c_mux_del_adapters(dev->muxc);
15c212dd MS	576	}
15c212dd MS	577
c3c3f1ae MS	578	struct i2c_adapter cx231xx_get_i2c_adap(struct cx231xx dev, int i2c_port)
	579	{
	580	switch (i2c_port) {
	581	case I2C_0:
	582	return &dev->i2c_bus[0].i2c_adap;
	583	case I2C_1:
	584	return &dev->i2c_bus[1].i2c_adap;
	585	case I2C_2:
	586	return &dev->i2c_bus[2].i2c_adap;
	587	case I2C_1_MUX_1:
05e0dfd0	588	return dev->muxc->adapter[0];
c3c3f1ae	589	case I2C_1_MUX_3:
05e0dfd0	590	return dev->muxc->adapter[1];
c3c3f1ae	591	default:
4001dfb4	592	BUG();
c3c3f1ae MS	593	}
	594	}
	595	EXPORT_SYMBOL_GPL(cx231xx_get_i2c_adap);