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Viewing changes to include/linux/spi/ads7846.h

  • Committer: Package Import Robot
  • Author(s): Alessio Igor Bogani
  • Date: 2011-10-26 11:13:05 UTC
  • Revision ID: package-import@ubuntu.com-20111026111305-tz023xykf0i6eosh
Tags: upstream-3.2.0
Import upstream version 3.2.0

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include/linux/spi/ads7846.h
 
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/* linux/spi/ads7846.h */
 
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/* Touchscreen characteristics vary between boards and models.  The
 
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 * platform_data for the device's "struct device" holds this information.
 
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 *
 
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 * It's OK if the min/max values are zero.
 
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 */
 
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enum ads7846_filter {
 
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        ADS7846_FILTER_OK,
 
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        ADS7846_FILTER_REPEAT,
 
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        ADS7846_FILTER_IGNORE,
 
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};
 
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struct ads7846_platform_data {
 
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        u16     model;                  /* 7843, 7845, 7846, 7873. */
 
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        u16     vref_delay_usecs;       /* 0 for external vref; etc */
 
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        u16     vref_mv;                /* external vref value, milliVolts
 
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                                         * ads7846: if 0, use internal vref */
 
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        bool    keep_vref_on;           /* set to keep vref on for differential
 
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                                         * measurements as well */
 
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        bool    swap_xy;                /* swap x and y axes */
 
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        /* Settling time of the analog signals; a function of Vcc and the
 
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         * capacitance on the X/Y drivers.  If set to non-zero, two samples
 
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         * are taken with settle_delay us apart, and the second one is used.
 
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         * ~150 uSec with 0.01uF caps.
 
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         */
 
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        u16     settle_delay_usecs;
 
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        /* If set to non-zero, after samples are taken this delay is applied
 
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         * and penirq is rechecked, to help avoid false events.  This value
 
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         * is affected by the material used to build the touch layer.
 
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         */
 
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        u16     penirq_recheck_delay_usecs;
 
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        u16     x_plate_ohms;
 
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        u16     y_plate_ohms;
 
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        u16     x_min, x_max;
 
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        u16     y_min, y_max;
 
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        u16     pressure_min, pressure_max;
 
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        u16     debounce_max;           /* max number of additional readings
 
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                                         * per sample */
 
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        u16     debounce_tol;           /* tolerance used for filtering */
 
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        u16     debounce_rep;           /* additional consecutive good readings
 
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                                         * required after the first two */
 
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        int     gpio_pendown;           /* the GPIO used to decide the pendown
 
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                                         * state if get_pendown_state == NULL
 
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                                         */
 
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        int     (*get_pendown_state)(void);
 
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        int     (*filter_init)  (const struct ads7846_platform_data *pdata,
 
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                                 void **filter_data);
 
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        int     (*filter)       (void *filter_data, int data_idx, int *val);
 
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        void    (*filter_cleanup)(void *filter_data);
 
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        void    (*wait_for_sync)(void);
 
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        bool    wakeup;
 
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        unsigned long irq_flags;
 
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};
 
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