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/*
* Copyright 2009-2011 Freescale Semiconductor, Inc. All Rights Reserved.
*/
/*
* The code contained herein is licensed under the GNU Lesser General
* Public License. You may obtain a copy of the GNU Lesser General
* Public License Version 2.1 or later at the following locations:
*
* http://www.opensource.org/licenses/lgpl-license.html
* http://www.gnu.org/copyleft/lgpl.html
*/
#ifndef __ASM_ARCH_IMX_ADC_H__
#define __ASM_ARCH_IMX_ADC_H__
/*!
* @defgroup IMX_ADC Digitizer Driver
* @ingroup IMX_DRVRS
*/
/*!
* @file arch-mxc/imx_adc.h
* @brief This is the header of IMX ADC driver.
*
* @ingroup IMX_ADC
*/
#include <linux/ioctl.h>
/*!
* @enum IMX_ADC_STATUS
* @brief Define return values for all IMX_ADC APIs.
*
* These return values are used by all of the IMX_ADC APIs.
*
* @ingroup IMX_ADC
*/
enum IMX_ADC_STATUS {
/*! The requested operation was successfully completed. */
IMX_ADC_SUCCESS = 0,
/*! The requested operation could not be completed due to an error. */
IMX_ADC_ERROR = -1,
/*!
* The requested operation failed because one or more of the
* parameters was invalid.
*/
IMX_ADC_PARAMETER_ERROR = -2,
/*!
* The requested operation could not be completed because the ADC
* hardware does not support it.
*/
IMX_ADC_NOT_SUPPORTED = -3,
/*! Error in malloc function */
IMX_ADC_MALLOC_ERROR = -5,
/*! Error in un-subscribe event */
IMX_ADC_UNSUBSCRIBE_ERROR = -6,
/*! Event occur and not subscribed */
IMX_ADC_EVENT_NOT_SUBSCRIBED = -7,
/*! Error - bad call back */
IMX_ADC_EVENT_CALL_BACK = -8,
/*!
* The requested operation could not be completed because there
* are too many ADC client requests
*/
IMX_ADC_CLIENT_NBOVERFLOW = -9,
};
/*
* Macros implementing error handling
*/
#define CHECK_ERROR(a) \
do { \
int ret = (a); \
if (ret != IMX_ADC_SUCCESS) \
return ret; \
} while (0)
#define CHECK_ERROR_KFREE(func, freeptrs) \
do { \
int ret = (func); \
if (ret != IMX_ADC_SUCCESS) { \
freeptrs; \
return ret; \
} \
} while (0)
#define MOD_NAME "mxcadc"
/*!
* @name IOCTL user space interface
*/
/*!
* Initialize ADC.
* Argument type: none.
*/
#define IMX_ADC_INIT _IO('p', 0xb0)
/*!
* De-initialize ADC.
* Argument type: none.
*/
#define IMX_ADC_DEINIT _IO('p', 0xb1)
/*!
* Convert one channel.
* Argument type: pointer to t_adc_convert_param.
*/
#define IMX_ADC_CONVERT _IOWR('p', 0xb2, int)
/*!
* Convert multiple channels.
* Argument type: pointer to t_adc_convert_param.
*/
#define IMX_ADC_CONVERT_MULTICHANNEL _IOWR('p', 0xb4, int)
/*! @{ */
/*!
* @name Touch Screen minimum and maximum values
*/
#define IMX_ADC_DEVICE "/dev/imx_adc"
/*
* Maximun allowed variation in the three X/Y co-ordinates acquired from
* touch screen
*/
#define DELTA_Y_MAX 100
#define DELTA_X_MAX 100
/* Upon clearing the filter, this is the delay in restarting the filter */
#define FILTER_MIN_DELAY 4
/* Length of X and Y touch screen filters */
#define FILTLEN 3
#define TS_X_MAX 1000
#define TS_Y_MAX 1000
#define TS_X_MIN 80
#define TS_Y_MIN 80
/*! @} */
/*!
* This enumeration defines input channels for IMX ADC
*/
enum t_channel {
TS_X_POS,
TS_Y_POS,
GER_PURPOSE_ADC0,
GER_PURPOSE_ADC1,
GER_PURPOSE_ADC2,
GER_PURPOSE_MULTICHNNEL,
};
/*!
* This structure is used to report touch screen value.
*/
struct t_touch_screen {
/* Touch Screen X position */
unsigned int x_position;
/* Touch Screen X position1 */
unsigned int x_position1;
/* Touch Screen X position2 */
unsigned int x_position2;
/* Touch Screen X position3 */
unsigned int x_position3;
/* Touch Screen Y position */
unsigned int y_position;
/* Touch Screen Y position1 */
unsigned int y_position1;
/* Touch Screen Y position2 */
unsigned int y_position2;
/* Touch Screen Y position3 */
unsigned int y_position3;
/* Touch Screen contact value */
unsigned int contact_resistance;
/* Flag indicate the data usability */
unsigned int valid_flag;
};
/*!
* This structure is used with IOCTL code \a IMX_ADC_CONVERT,
* \a IMX_ADC_CONVERT_8X and \a IMX_ADC_CONVERT_MULTICHANNEL.
*/
struct t_adc_convert_param {
/* channel or channels to be sampled. */
enum t_channel channel;
/* holds up to 16 sampling results */
unsigned short result[16];
};
/* EXPORTED FUNCTIONS */
#ifdef __KERNEL__
/* Driver data */
struct imx_adc_data {
u32 irq;
struct clk *adc_clk;
};
/*!
* This function initializes all ADC registers with default values. This
* function also registers the interrupt events.
*
* @return This function returns IMX_ADC_SUCCESS if successful.
*/
enum IMX_ADC_STATUS imx_adc_init(void);
/*!
* This function disables the ADC, de-registers the interrupt events.
*
* @return This function returns IMX_ADC_SUCCESS if successful.
*/
enum IMX_ADC_STATUS imx_adc_deinit(void);
/*!
* This function triggers a conversion and returns one sampling result of one
* channel.
*
* @param channel The channel to be sampled
* @param result The pointer to the conversion result. The memory
* should be allocated by the caller of this function.
*
* @return This function returns IMX_ADC_SUCCESS if successful.
*/
enum IMX_ADC_STATUS imx_adc_convert(enum t_channel channel,
unsigned short *result);
/*!
* This function triggers a conversion and returns sampling results of each
* specified channel.
*
* @param channels This input parameter is bitmap to specify channels
* to be sampled.
* @param result The pointer to array to store sampling result.
* The order of the result in the array is from lowest
* channel number to highest channel number of the
* sampled channels.
* The memory should be allocated by the caller of this
* function.
* Note that the behavior of this function might differ
* from one platform to another regarding especially
* channels order.
*
* @return This function returns IMX_ADC_SUCCESS if successful.
*/
enum IMX_ADC_STATUS imx_adc_convert_multichnnel(enum t_channel channels,
unsigned short *result);
/*!
* This function retrieves the current touch screen operation mode.
*
* @param touch_sample Pointer to touch sample.
* @param wait_tsi if true, we wait until interrupt occurs
* @return This function returns IMX_ADC_SUCCESS if successful.
*/
enum IMX_ADC_STATUS imx_adc_get_touch_sample(struct t_touch_screen *ts_value,
int wait_tsi);
/*!
* This function read the touch screen value.
*
* @param touch_sample return value of touch screen
* @param wait_tsi if true, we need wait until interrupt occurs
* @return This function returns 0.
*/
enum IMX_ADC_STATUS imx_adc_read_ts(struct t_touch_screen *touch_sample,
int wait_tsi);
int is_imx_adc_ready(void);
#endif /* _KERNEL */
#endif /* __ASM_ARCH_IMX_ADC_H__ */
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