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Commit 73b3fc3d authored by Mauro Carvalho Chehab's avatar Mauro Carvalho Chehab
Browse files

[media] drx-j: get rid of drx_dap_fasi.c 



This file contains an abstract layer for the I2C transfer
functions. Get rid of it, merging it at drxj. This will allow
to remove another abstraction layer there, making the code
easier to read, and removing the functions that just return
-EIO.

Acked-by: default avatarDevin Heitmueller <dheitmueller@kernellabs.com>
Signed-off-by: default avatarMauro Carvalho Chehab <m.chehab@samsung.com>
parent 0ad0c37c

drivers/media/dvb-frontends/drx39xyj/Makefile

+1 −1
Original line number Diff line number Diff line 
drx39xyj-objs := drx39xxj_dummy.o drxj.o drx_dap_fasi.o

drx39xyj-objs := drxj.o



obj-$(CONFIG_DVB_DRX39XYJ) += drx39xyj.o

drivers/media/dvb-frontends/drx39xyj/drx_dap_fasi.c

deleted100644 → 0
+0 −598
Original line number Diff line number Diff line 
/*

  Copyright (c), 2004-2005,2007-2010 Trident Microsystems, Inc.

  All rights reserved.



  Redistribution and use in source and binary forms, with or without

  modification, are permitted provided that the following conditions are met:



  * Redistributions of source code must retain the above copyright notice,

    this list of conditions and the following disclaimer.

  * Redistributions in binary form must reproduce the above copyright notice,

    this list of conditions and the following disclaimer in the documentation

	and/or other materials provided with the distribution.

  * Neither the name of Trident Microsystems nor Hauppauge Computer Works

    nor the names of its contributors may be used to endorse or promote

	products derived from this software without specific prior written

	permission.



  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE

  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

  POSSIBILITY OF SUCH DAMAGE.



  DESCRIPTION:

  Part of DRX driver.

  Data access protocol: Fast Access Sequential Interface (fasi)

  Fast access, because of short addressing format (16 instead of 32 bits addr)

  Sequential, because of I2C.

  These functions know how the chip's memory and registers are to be accessed,

  but nothing more.



  These functions should not need adapting to a new platform.

*/



#include "drx_dap_fasi.h"

#include "drx39xxj.h"



#include <linux/delay.h>

#include <linux/jiffies.h>





/*============================================================================*/



/*============================================================================*/



/* Functions not supported by protocol*/



static int drxdap_fasi_write_reg8(struct i2c_device_addr *dev_addr,	/* address of I2C device        */

					 u32 addr,	/* address of register          */

					 u8 data,	/* data to write                */

					 u32 flags)

{				/* special device flags         */

	return -EIO;

}



static int drxdap_fasi_read_reg8(struct i2c_device_addr *dev_addr,	/* address of I2C device        */

					u32 addr,	/* address of register          */

					u8 *data,	/* buffer to receive data       */

					u32 flags)

{				/* special device flags         */

	return -EIO;

}



static int drxdap_fasi_read_modify_write_reg8(struct i2c_device_addr *dev_addr,	/* address of I2C device        */

						   u32 waddr,	/* address of register          */

						   u32 raddr,	/* address to read back from    */

						   u8 datain,	/* data to send                 */

						   u8 *dataout)

{				/* data to receive back         */

	return -EIO;

}



static int drxdap_fasi_read_modify_write_reg32(struct i2c_device_addr *dev_addr,	/* address of I2C device        */

						    u32 waddr,	/* address of register          */

						    u32 raddr,	/* address to read back from    */

						    u32 datain,	/* data to send                 */

						    u32 *dataout)

{				/* data to receive back         */

	return -EIO;

}





int drxbsp_i2c_write_read(struct i2c_device_addr *w_dev_addr,

				 u16 w_count,

				 u8 *wData,

				 struct i2c_device_addr *r_dev_addr,

				 u16 r_count, u8 *r_data)

{

	struct drx39xxj_state *state;

	struct i2c_msg msg[2];

	unsigned int num_msgs;



	if (w_dev_addr == NULL) {

		/* Read only */

		state = r_dev_addr->user_data;

		msg[0].addr = r_dev_addr->i2c_addr >> 1;

		msg[0].flags = I2C_M_RD;

		msg[0].buf = r_data;

		msg[0].len = r_count;

		num_msgs = 1;

	} else if (r_dev_addr == NULL) {

		/* Write only */

		state = w_dev_addr->user_data;

		msg[0].addr = w_dev_addr->i2c_addr >> 1;

		msg[0].flags = 0;

		msg[0].buf = wData;

		msg[0].len = w_count;

		num_msgs = 1;

	} else {

		/* Both write and read */

		state = w_dev_addr->user_data;

		msg[0].addr = w_dev_addr->i2c_addr >> 1;

		msg[0].flags = 0;

		msg[0].buf = wData;

		msg[0].len = w_count;

		msg[1].addr = r_dev_addr->i2c_addr >> 1;

		msg[1].flags = I2C_M_RD;

		msg[1].buf = r_data;

		msg[1].len = r_count;

		num_msgs = 2;

	}



	if (state->i2c == NULL) {

		pr_err("i2c was zero, aborting\n");

		return 0;

	}

	if (i2c_transfer(state->i2c, msg, num_msgs) != num_msgs) {

		pr_warn("drx3933: I2C write/read failed\n");

		return -EREMOTEIO;

	}



	return 0;



#ifdef DJH_DEBUG

	struct drx39xxj_state *state = w_dev_addr->user_data;



	struct i2c_msg msg[2] = {

		{.addr = w_dev_addr->i2c_addr,

		 .flags = 0, .buf = wData, .len = w_count},

		{.addr = r_dev_addr->i2c_addr,

		 .flags = I2C_M_RD, .buf = r_data, .len = r_count},

	};



	pr_dbg("drx3933 i2c operation addr=%x i2c=%p, wc=%x rc=%x\n",

	       w_dev_addr->i2c_addr, state->i2c, w_count, r_count);



	if (i2c_transfer(state->i2c, msg, 2) != 2) {

		pr_warn("drx3933: I2C write/read failed\n");

		return -EREMOTEIO;

	}

#endif

	return 0;

}



/*============================================================================*/



/******************************

*

* int drxdap_fasi_read_block (

*      struct i2c_device_addr *dev_addr,      -- address of I2C device

*      u32 addr,         -- address of chip register/memory

*      u16            datasize,     -- number of bytes to read

*      u8 *data,         -- data to receive

*      u32 flags)        -- special device flags

*

* Read block data from chip address. Because the chip is word oriented,

* the number of bytes to read must be even.

*

* Make sure that the buffer to receive the data is large enough.

*

* Although this function expects an even number of bytes, it is still byte

* oriented, and the data read back is NOT translated to the endianness of

* the target platform.

*

* Output:

* - 0     if reading was successful

*                  in that case: data read is in *data.

* - -EIO  if anything went wrong

*

******************************/



static int drxdap_fasi_read_block(struct i2c_device_addr *dev_addr,

					 u32 addr,

					 u16 datasize,

					 u8 *data, u32 flags)

{

	u8 buf[4];

	u16 bufx;

	int rc;

	u16 overhead_size = 0;



	/* Check parameters ******************************************************* */

	if (dev_addr == NULL)

		return -EINVAL;



	overhead_size = (IS_I2C_10BIT(dev_addr->i2c_addr) ? 2 : 1) +

	    (DRXDAP_FASI_LONG_FORMAT(addr) ? 4 : 2);



	if ((DRXDAP_FASI_OFFSET_TOO_LARGE(addr)) ||

	    ((!(DRXDAPFASI_LONG_ADDR_ALLOWED)) &&

	     DRXDAP_FASI_LONG_FORMAT(addr)) ||

	    (overhead_size > (DRXDAP_MAX_WCHUNKSIZE)) ||

	    ((datasize != 0) && (data == NULL)) || ((datasize & 1) == 1)) {

		return -EINVAL;

	}



	/* ReadModifyWrite & mode flag bits are not allowed */

	flags &= (~DRXDAP_FASI_RMW & ~DRXDAP_FASI_MODEFLAGS);

#if DRXDAP_SINGLE_MASTER

	flags |= DRXDAP_FASI_SINGLE_MASTER;

#endif



	/* Read block from I2C **************************************************** */

	do {

		u16 todo = (datasize < DRXDAP_MAX_RCHUNKSIZE ?

			      datasize : DRXDAP_MAX_RCHUNKSIZE);



		bufx = 0;



		addr &= ~DRXDAP_FASI_FLAGS;

		addr |= flags;



#if ((DRXDAPFASI_LONG_ADDR_ALLOWED == 1) && (DRXDAPFASI_SHORT_ADDR_ALLOWED == 1))

		/* short format address preferred but long format otherwise */

		if (DRXDAP_FASI_LONG_FORMAT(addr)) {

#endif

#if (DRXDAPFASI_LONG_ADDR_ALLOWED == 1)

			buf[bufx++] = (u8) (((addr << 1) & 0xFF) | 0x01);

			buf[bufx++] = (u8) ((addr >> 16) & 0xFF);

			buf[bufx++] = (u8) ((addr >> 24) & 0xFF);

			buf[bufx++] = (u8) ((addr >> 7) & 0xFF);

#endif

#if ((DRXDAPFASI_LONG_ADDR_ALLOWED == 1) && (DRXDAPFASI_SHORT_ADDR_ALLOWED == 1))

		} else {

#endif

#if (DRXDAPFASI_SHORT_ADDR_ALLOWED == 1)

			buf[bufx++] = (u8) ((addr << 1) & 0xFF);

			buf[bufx++] =

			    (u8) (((addr >> 16) & 0x0F) |

				    ((addr >> 18) & 0xF0));

#endif

#if ((DRXDAPFASI_LONG_ADDR_ALLOWED == 1) && (DRXDAPFASI_SHORT_ADDR_ALLOWED == 1))

		}

#endif



#if DRXDAP_SINGLE_MASTER

		/*

		 * In single master mode, split the read and write actions.

		 * No special action is needed for write chunks here.

		 */

		rc = drxbsp_i2c_write_read(dev_addr, bufx, buf, 0, 0, 0);

		if (rc == 0)

			rc = drxbsp_i2c_write_read(0, 0, 0, dev_addr, todo, data);

#else

		/* In multi master mode, do everything in one RW action */

		rc = drxbsp_i2c_write_read(dev_addr, bufx, buf, dev_addr, todo,

					  data);

#endif

		data += todo;

		addr += (todo >> 1);

		datasize -= todo;

	} while (datasize && rc == 0);



	return rc;

}





/******************************

*

* int drxdap_fasi_read_reg16 (

*     struct i2c_device_addr *dev_addr, -- address of I2C device

*     u32 addr,    -- address of chip register/memory

*     u16 *data,    -- data to receive

*     u32 flags)   -- special device flags

*

* Read one 16-bit register or memory location. The data received back is

* converted back to the target platform's endianness.

*

* Output:

* - 0     if reading was successful

*                  in that case: read data is at *data

* - -EIO  if anything went wrong

*

******************************/



static int drxdap_fasi_read_reg16(struct i2c_device_addr *dev_addr,

					 u32 addr,

					 u16 *data, u32 flags)

{

	u8 buf[sizeof(*data)];

	int rc;



	if (!data)

		return -EINVAL;



	rc = drxdap_fasi_read_block(dev_addr, addr, sizeof(*data), buf, flags);

	*data = buf[0] + (((u16) buf[1]) << 8);

	return rc;

}



/******************************

*

* int drxdap_fasi_read_reg32 (

*     struct i2c_device_addr *dev_addr, -- address of I2C device

*     u32 addr,    -- address of chip register/memory

*     u32 *data,    -- data to receive

*     u32 flags)   -- special device flags

*

* Read one 32-bit register or memory location. The data received back is

* converted back to the target platform's endianness.

*

* Output:

* - 0     if reading was successful

*                  in that case: read data is at *data

* - -EIO  if anything went wrong

*

******************************/



static int drxdap_fasi_read_reg32(struct i2c_device_addr *dev_addr,

					 u32 addr,

					 u32 *data, u32 flags)

{

	u8 buf[sizeof(*data)];

	int rc;



	if (!data)

		return -EINVAL;



	rc = drxdap_fasi_read_block(dev_addr, addr, sizeof(*data), buf, flags);

	*data = (((u32) buf[0]) << 0) +

	    (((u32) buf[1]) << 8) +

	    (((u32) buf[2]) << 16) + (((u32) buf[3]) << 24);

	return rc;

}



/******************************

*

* int drxdap_fasi_write_block (

*      struct i2c_device_addr *dev_addr,    -- address of I2C device

*      u32 addr,       -- address of chip register/memory

*      u16            datasize,   -- number of bytes to read

*      u8 *data,       -- data to receive

*      u32 flags)      -- special device flags

*

* Write block data to chip address. Because the chip is word oriented,

* the number of bytes to write must be even.

*

* Although this function expects an even number of bytes, it is still byte

* oriented, and the data being written is NOT translated from the endianness of

* the target platform.

*

* Output:

* - 0     if writing was successful

* - -EIO  if anything went wrong

*

******************************/



static int drxdap_fasi_write_block(struct i2c_device_addr *dev_addr,

					  u32 addr,

					  u16 datasize,

					  u8 *data, u32 flags)

{

	u8 buf[DRXDAP_MAX_WCHUNKSIZE];

	int st = -EIO;

	int first_err = 0;

	u16 overhead_size = 0;

	u16 block_size = 0;



	/* Check parameters ******************************************************* */

	if (dev_addr == NULL)

		return -EINVAL;



	overhead_size = (IS_I2C_10BIT(dev_addr->i2c_addr) ? 2 : 1) +

	    (DRXDAP_FASI_LONG_FORMAT(addr) ? 4 : 2);



	if ((DRXDAP_FASI_OFFSET_TOO_LARGE(addr)) ||

	    ((!(DRXDAPFASI_LONG_ADDR_ALLOWED)) &&

	     DRXDAP_FASI_LONG_FORMAT(addr)) ||

	    (overhead_size > (DRXDAP_MAX_WCHUNKSIZE)) ||

	    ((datasize != 0) && (data == NULL)) || ((datasize & 1) == 1))

		return -EINVAL;



	flags &= DRXDAP_FASI_FLAGS;

	flags &= ~DRXDAP_FASI_MODEFLAGS;

#if DRXDAP_SINGLE_MASTER

	flags |= DRXDAP_FASI_SINGLE_MASTER;

#endif



	/* Write block to I2C ***************************************************** */

	block_size = ((DRXDAP_MAX_WCHUNKSIZE) - overhead_size) & ~1;

	do {

		u16 todo = 0;

		u16 bufx = 0;



		/* Buffer device address */

		addr &= ~DRXDAP_FASI_FLAGS;

		addr |= flags;

#if (((DRXDAPFASI_LONG_ADDR_ALLOWED) == 1) && ((DRXDAPFASI_SHORT_ADDR_ALLOWED) == 1))

		/* short format address preferred but long format otherwise */

		if (DRXDAP_FASI_LONG_FORMAT(addr)) {

#endif

#if ((DRXDAPFASI_LONG_ADDR_ALLOWED) == 1)

			buf[bufx++] = (u8) (((addr << 1) & 0xFF) | 0x01);

			buf[bufx++] = (u8) ((addr >> 16) & 0xFF);

			buf[bufx++] = (u8) ((addr >> 24) & 0xFF);

			buf[bufx++] = (u8) ((addr >> 7) & 0xFF);

#endif

#if (((DRXDAPFASI_LONG_ADDR_ALLOWED) == 1) && ((DRXDAPFASI_SHORT_ADDR_ALLOWED) == 1))

		} else {

#endif

#if ((DRXDAPFASI_SHORT_ADDR_ALLOWED) == 1)

			buf[bufx++] = (u8) ((addr << 1) & 0xFF);

			buf[bufx++] =

			    (u8) (((addr >> 16) & 0x0F) |

				    ((addr >> 18) & 0xF0));

#endif

#if (((DRXDAPFASI_LONG_ADDR_ALLOWED) == 1) && ((DRXDAPFASI_SHORT_ADDR_ALLOWED) == 1))

		}

#endif



		/*

		   In single master mode block_size can be 0. In such a case this I2C

		   sequense will be visible: (1) write address {i2c addr,

		   4 bytes chip address} (2) write data {i2c addr, 4 bytes data }

		   (3) write address (4) write data etc...

		   Addres must be rewriten because HI is reset after data transport and

		   expects an address.

		 */

		todo = (block_size < datasize ? block_size : datasize);

		if (todo == 0) {

			u16 overhead_size_i2c_addr = 0;

			u16 data_block_size = 0;



			overhead_size_i2c_addr =

			    (IS_I2C_10BIT(dev_addr->i2c_addr) ? 2 : 1);

			data_block_size =

			    (DRXDAP_MAX_WCHUNKSIZE - overhead_size_i2c_addr) & ~1;



			/* write device address */

			st = drxbsp_i2c_write_read(dev_addr,

						  (u16) (bufx),

						  buf,

						  (struct i2c_device_addr *)(NULL),

						  0, (u8 *)(NULL));



			if ((st != 0) && (first_err == 0)) {

				/* at the end, return the first error encountered */

				first_err = st;

			}

			bufx = 0;

			todo =

			    (data_block_size <

			     datasize ? data_block_size : datasize);

		}

		memcpy(&buf[bufx], data, todo);

		/* write (address if can do and) data */

		st = drxbsp_i2c_write_read(dev_addr,

					  (u16) (bufx + todo),

					  buf,

					  (struct i2c_device_addr *)(NULL),

					  0, (u8 *)(NULL));



		if ((st != 0) && (first_err == 0)) {

			/* at the end, return the first error encountered */

			first_err = st;

		}

		datasize -= todo;

		data += todo;

		addr += (todo >> 1);

	} while (datasize);



	return first_err;

}



/******************************

*

* int drxdap_fasi_write_reg16 (

*     struct i2c_device_addr *dev_addr, -- address of I2C device

*     u32 addr,    -- address of chip register/memory

*     u16            data,    -- data to send

*     u32 flags)   -- special device flags

*

* Write one 16-bit register or memory location. The data being written is

* converted from the target platform's endianness to little endian.

*

* Output:

* - 0     if writing was successful

* - -EIO  if anything went wrong

*

******************************/



static int drxdap_fasi_write_reg16(struct i2c_device_addr *dev_addr,

					  u32 addr,

					  u16 data, u32 flags)

{

	u8 buf[sizeof(data)];



	buf[0] = (u8) ((data >> 0) & 0xFF);

	buf[1] = (u8) ((data >> 8) & 0xFF);



	return drxdap_fasi_write_block(dev_addr, addr, sizeof(data), buf, flags);

}



/******************************

*

* int drxdap_fasi_read_modify_write_reg16 (

*      struct i2c_device_addr *dev_addr,   -- address of I2C device

*      u32 waddr,     -- address of chip register/memory

*      u32 raddr,     -- chip address to read back from

*      u16            wdata,     -- data to send

*      u16 *rdata)     -- data to receive back

*

* Write 16-bit data, then read back the original contents of that location.

* Requires long addressing format to be allowed.

*

* Before sending data, the data is converted to little endian. The

* data received back is converted back to the target platform's endianness.

*

* WARNING: This function is only guaranteed to work if there is one

* master on the I2C bus.

*

* Output:

* - 0     if reading was successful

*                  in that case: read back data is at *rdata

* - -EIO  if anything went wrong

*

******************************/



static int drxdap_fasi_read_modify_write_reg16(struct i2c_device_addr *dev_addr,

						    u32 waddr,

						    u32 raddr,

						    u16 wdata, u16 *rdata)

{

	int rc = -EIO;



#if (DRXDAPFASI_LONG_ADDR_ALLOWED == 1)

	if (rdata == NULL)

		return -EINVAL;



	rc = drxdap_fasi_write_reg16(dev_addr, waddr, wdata, DRXDAP_FASI_RMW);

	if (rc == 0)

		rc = drxdap_fasi_read_reg16(dev_addr, raddr, rdata, 0);

#endif



	return rc;

}



/******************************

*

* int drxdap_fasi_write_reg32 (

*     struct i2c_device_addr *dev_addr, -- address of I2C device

*     u32 addr,    -- address of chip register/memory

*     u32            data,    -- data to send

*     u32 flags)   -- special device flags

*

* Write one 32-bit register or memory location. The data being written is

* converted from the target platform's endianness to little endian.

*

* Output:

* - 0     if writing was successful

* - -EIO  if anything went wrong

*

******************************/



static int drxdap_fasi_write_reg32(struct i2c_device_addr *dev_addr,

					  u32 addr,

					  u32 data, u32 flags)

{

	u8 buf[sizeof(data)];



	buf[0] = (u8) ((data >> 0) & 0xFF);

	buf[1] = (u8) ((data >> 8) & 0xFF);

	buf[2] = (u8) ((data >> 16) & 0xFF);

	buf[3] = (u8) ((data >> 24) & 0xFF);



	return drxdap_fasi_write_block(dev_addr, addr, sizeof(data), buf, flags);

}



/* The structure containing the protocol interface */

struct drx_access_func drx_dap_fasi_funct_g = {

	drxdap_fasi_write_block,	/* Supported */

	drxdap_fasi_read_block,	/* Supported */

	drxdap_fasi_write_reg8,	/* Not supported */

	drxdap_fasi_read_reg8,	/* Not supported */

	drxdap_fasi_read_modify_write_reg8,	/* Not supported */

	drxdap_fasi_write_reg16,	/* Supported */

	drxdap_fasi_read_reg16,	/* Supported */

	drxdap_fasi_read_modify_write_reg16,	/* Supported */

	drxdap_fasi_write_reg32,	/* Supported */

	drxdap_fasi_read_reg32,	/* Supported */

	drxdap_fasi_read_modify_write_reg32	/* Not supported */

};

drivers/media/dvb-frontends/drx39xyj/drxj.c

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