drivers/staging/iio/adc/max1363.h

   1 #ifndef _MAX1363_H_
   2 #define  _MAX1363_H_
   3
   4 #define MAX1363_SETUP_BYTE(a) ((a) | 0x80)
   5
   6 /* There is a fair bit more defined here than currently
   7  * used, but the intention is to support everything these
   8  * chips do in the long run */
   9
  10 /* see data sheets */
  11 /* max1363 and max1236, max1237, max1238, max1239 */
  12 #define MAX1363_SETUP_AIN3_IS_AIN3_REF_IS_VDD   0x00
  13 #define MAX1363_SETUP_AIN3_IS_REF_EXT_TO_REF    0x20
  14 #define MAX1363_SETUP_AIN3_IS_AIN3_REF_IS_INT   0x40
  15 #define MAX1363_SETUP_AIN3_IS_REF_REF_IS_INT    0x60
  16 #define MAX1363_SETUP_POWER_UP_INT_REF          0x10
  17 #define MAX1363_SETUP_POWER_DOWN_INT_REF        0x00
  18
  19 /* think about includeing max11600 etc - more settings */
  20 #define MAX1363_SETUP_EXT_CLOCK                 0x08
  21 #define MAX1363_SETUP_INT_CLOCK                 0x00
  22 #define MAX1363_SETUP_UNIPOLAR                  0x00
  23 #define MAX1363_SETUP_BIPOLAR                   0x04
  24 #define MAX1363_SETUP_RESET                     0x00
  25 #define MAX1363_SETUP_NORESET                   0x02
  26 /* max1363 only - though don't care on others.
  27  * For now monitor modes are not implemented as the relevant
  28  * line is not connected on my test board.
  29  * The definitions are here as I intend to add this soon.
  30  */
  31 #define MAX1363_SETUP_MONITOR_SETUP             0x01
  32
  33 /* Specific to the max1363 */
  34 #define MAX1363_MON_RESET_CHAN(a) (1 << ((a) + 4))
  35 #define MAX1363_MON_INT_ENABLE                  0x01
  36
  37 /* defined for readability reasons */
  38 /* All chips */
  39 #define MAX1363_CONFIG_BYTE(a) ((a))
  40
  41 #define MAX1363_CONFIG_SE                       0x01
  42 #define MAX1363_CONFIG_DE                       0x00
  43 #define MAX1363_CONFIG_SCAN_TO_CS               0x00
  44 #define MAX1363_CONFIG_SCAN_SINGLE_8            0x20
  45 #define MAX1363_CONFIG_SCAN_MONITOR_MODE        0x40
  46 #define MAX1363_CONFIG_SCAN_SINGLE_1            0x60
  47 /* max123{6-9} only */
  48 #define MAX1236_SCAN_MID_TO_CHANNEL             0x40
  49
  50 /* max1363 only - merely part of channel selects or don't care for others*/
  51 #define MAX1363_CONFIG_EN_MON_MODE_READ 0x18
  52
  53 #define MAX1363_CHANNEL_SEL(a) ((a) << 1)
  54
  55 /* max1363 strictly 0x06 - but doesn't matter */
  56 #define MAX1363_CHANNEL_SEL_MASK                0x1E
  57 #define MAX1363_SCAN_MASK                       0x60
  58 #define MAX1363_SE_DE_MASK                      0x01
  59
  60 #define MAX1363_MAX_CHANNELS 25
  61 /**
  62  * struct max1363_mode - scan mode information
  63  * @conf:       The corresponding value of the configuration register
  64  * @modemask:   Bit mask corresponding to channels enabled in this mode
  65  */
  66 struct max1363_mode {
  67         int8_t          conf;
  68         DECLARE_BITMAP(modemask, MAX1363_MAX_CHANNELS);
  69 };
  70
  71 /* This must be maintained along side the max1363_mode_table in max1363_core */
  72 enum max1363_modes {
  73         /* Single read of a single channel */
  74         _s0, _s1, _s2, _s3, _s4, _s5, _s6, _s7, _s8, _s9, _s10, _s11,
  75         /* Differential single read */
  76         d0m1, d2m3, d4m5, d6m7, d8m9, d10m11,
  77         d1m0, d3m2, d5m4, d7m6, d9m8, d11m10,
  78         /* Scan to channel and mid to channel where overlapping */
  79         s0to1, s0to2, s2to3, s0to3, s0to4, s0to5, s0to6,
  80         s6to7, s0to7, s6to8, s0to8, s6to9,
  81         s0to9, s6to10, s0to10, s6to11, s0to11,
  82         /* Differential scan to channel and mid to channel where overlapping */
  83         d0m1to2m3, d0m1to4m5, d0m1to6m7, d6m7to8m9,
  84         d0m1to8m9, d6m7to10m11, d0m1to10m11, d1m0to3m2,
  85         d1m0to5m4, d1m0to7m6, d7m6to9m8, d1m0to9m8,
  86         d7m6to11m10, d1m0to11m10,
  87 };
  88
  89 /**
  90  * struct max1363_chip_info - chip specifc information
  91  * @name:               indentification string for chip
  92  * @bits:               accuracy of the adc in bits
  93  * @int_vref_mv:        the internal reference voltage
  94  * @info:               iio core function callbacks structure
  95  * @mode_list:          array of available scan modes
  96  * @num_modes:          the number of scan modes available
  97  * @default_mode:       the scan mode in which the chip starts up
  98  * @channel:            channel specification
  99  * @num_channels:       number of channels
 100  */
 101 struct max1363_chip_info {
 102         const struct iio_info           *info;
 103         struct iio_chan_spec *channels;
 104         int num_channels;
 105         const enum max1363_modes        *mode_list;
 106         enum max1363_modes              default_mode;
 107         u16                             int_vref_mv;
 108         u8                              num_modes;
 109         u8                              bits;
 110 };
 111
 112 /**
 113  * struct max1363_state - driver instance specific data
 114  * @client:             i2c_client
 115  * @setupbyte:          cache of current device setup byte
 116  * @configbyte:         cache of current device config byte
 117  * @chip_info:          chip model specific constants, available modes etc
 118  * @current_mode:       the scan mode of this chip
 119  * @requestedmask:      a valid requested set of channels
 120  * @reg:                supply regulator
 121  * @monitor_on:         whether monitor mode is enabled
 122  * @monitor_speed:      parameter corresponding to device monitor speed setting
 123  * @mask_high:          bitmask for enabled high thresholds
 124  * @mask_low:           bitmask for enabled low thresholds
 125  * @thresh_high:        high threshold values
 126  * @thresh_low:         low threshold values
 127  */
 128 struct max1363_state {
 129         struct i2c_client               *client;
 130         u8                              setupbyte;
 131         u8                              configbyte;
 132         const struct max1363_chip_info  *chip_info;
 133         const struct max1363_mode       *current_mode;
 134         u32                             requestedmask;
 135         struct regulator                *reg;
 136
 137         /* Using monitor modes and buffer at the same time is
 138            currently not supported */
 139         bool                            monitor_on;
 140         unsigned int                    monitor_speed:3;
 141         u8                              mask_high;
 142         u8                              mask_low;
 143         /* 4x unipolar first then the fours bipolar ones */
 144         s16                             thresh_high[8];
 145         s16                             thresh_low[8];
 146 };
 147
 148 const struct max1363_mode
 149 *max1363_match_mode(const unsigned long *mask,
 150                     const struct max1363_chip_info *ci);
 151
 152 int max1363_set_scan_mode(struct max1363_state *st);
 153
 154 #ifdef CONFIG_MAX1363_RING_BUFFER
 155 int max1363_update_scan_mode(struct iio_dev *indio_dev,
 156                              const unsigned long *scan_mask);
 157 int max1363_register_ring_funcs_and_init(struct iio_dev *indio_dev);
 158 void max1363_ring_cleanup(struct iio_dev *indio_dev);
 159
 160 #else /* CONFIG_MAX1363_RING_BUFFER */
 161 int max1363_update_scan_mode(struct iio_dev *indio_dev,
 162                              const long *scan_mask)
 163 {
 164         return 0;
 165 }
 166
 167 static inline int
 168 max1363_register_ring_funcs_and_init(struct iio_dev *indio_dev)
 169 {
 170         return 0;
 171 }
 172
 173 static inline void max1363_ring_cleanup(struct iio_dev *indio_dev)
 174 {
 175 }
 176 #endif /* CONFIG_MAX1363_RING_BUFFER */
 177 #endif /* _MAX1363_H_ */