include/linux/wm97xx.h

   1
   2 /*
   3  * Register bits and API for Wolfson WM97xx series of codecs
   4  */
   5
   6 #ifndef _LINUX_WM97XX_H
   7 #define _LINUX_WM97XX_H
   8
   9 #include <sound/core.h>
  10 #include <sound/pcm.h>
  11 #include <sound/ac97_codec.h>
  12 #include <sound/initval.h>
  13 #include <linux/types.h>
  14 #include <linux/list.h>
  15 #include <linux/input.h>        /* Input device layer */
  16 #include <linux/platform_device.h>
  17
  18 /*
  19  * WM97xx AC97 Touchscreen registers
  20  */
  21 #define AC97_WM97XX_DIGITISER1          0x76
  22 #define AC97_WM97XX_DIGITISER2          0x78
  23 #define AC97_WM97XX_DIGITISER_RD        0x7a
  24 #define AC97_WM9713_DIG1                0x74
  25 #define AC97_WM9713_DIG2                AC97_WM97XX_DIGITISER1
  26 #define AC97_WM9713_DIG3                AC97_WM97XX_DIGITISER2
  27
  28 /*
  29  * WM97xx register bits
  30  */
  31 #define WM97XX_POLL             0x8000  /* initiate a polling measurement */
  32 #define WM97XX_ADCSEL_X         0x1000  /* x coord measurement */
  33 #define WM97XX_ADCSEL_Y         0x2000  /* y coord measurement */
  34 #define WM97XX_ADCSEL_PRES      0x3000  /* pressure measurement */
  35 #define WM97XX_ADCSEL_MASK      0x7000
  36 #define WM97XX_COO              0x0800  /* enable coordinate mode */
  37 #define WM97XX_CTC              0x0400  /* enable continuous mode */
  38 #define WM97XX_CM_RATE_93       0x0000  /* 93.75Hz continuous rate */
  39 #define WM97XX_CM_RATE_187      0x0100  /* 187.5Hz continuous rate */
  40 #define WM97XX_CM_RATE_375      0x0200  /* 375Hz continuous rate */
  41 #define WM97XX_CM_RATE_750      0x0300  /* 750Hz continuous rate */
  42 #define WM97XX_CM_RATE_8K       0x00f0  /* 8kHz continuous rate */
  43 #define WM97XX_CM_RATE_12K      0x01f0  /* 12kHz continuous rate */
  44 #define WM97XX_CM_RATE_24K      0x02f0  /* 24kHz continuous rate */
  45 #define WM97XX_CM_RATE_48K      0x03f0  /* 48kHz continuous rate */
  46 #define WM97XX_CM_RATE_MASK     0x03f0
  47 #define WM97XX_RATE(i)          (((i & 3) << 8) | ((i & 4) ? 0xf0 : 0))
  48 #define WM97XX_DELAY(i)         ((i << 4) & 0x00f0)     /* sample delay times */
  49 #define WM97XX_DELAY_MASK       0x00f0
  50 #define WM97XX_SLEN             0x0008  /* slot read back enable */
  51 #define WM97XX_SLT(i)           ((i - 5) & 0x7) /* panel slot (5-11) */
  52 #define WM97XX_SLT_MASK         0x0007
  53 #define WM97XX_PRP_DETW         0x4000  /* detect on, digitise off, wake */
  54 #define WM97XX_PRP_DET          0x8000  /* detect on, digitise off, no wake */
  55 #define WM97XX_PRP_DET_DIG      0xc000  /* setect on, digitise on */
  56 #define WM97XX_RPR              0x2000  /* wake up on pen down */
  57 #define WM97XX_PEN_DOWN         0x8000  /* pen is down */
  58 #define WM97XX_ADCSRC_MASK      0x7000  /* ADC source mask */
  59
  60 #define WM97XX_AUX_ID1          0x8001
  61 #define WM97XX_AUX_ID2          0x8002
  62 #define WM97XX_AUX_ID3          0x8003
  63 #define WM97XX_AUX_ID4          0x8004
  64
  65
  66 /* WM9712 Bits */
  67 #define WM9712_45W              0x1000  /* set for 5-wire touchscreen */
  68 #define WM9712_PDEN             0x0800  /* measure only when pen down */
  69 #define WM9712_WAIT             0x0200  /* wait until adc is read before next sample */
  70 #define WM9712_PIL              0x0100  /* current used for pressure measurement. set 400uA else 200uA */
  71 #define WM9712_MASK_HI          0x0040  /* hi on mask pin (47) stops conversions */
  72 #define WM9712_MASK_EDGE        0x0080  /* rising/falling edge on pin delays sample */
  73 #define WM9712_MASK_SYNC        0x00c0  /* rising/falling edge on mask initiates sample */
  74 #define WM9712_RPU(i)           (i&0x3f)        /* internal pull up on pen detect (64k / rpu) */
  75 #define WM9712_PD(i)            (0x1 << i)      /* power management */
  76
  77 /* WM9712 Registers */
  78 #define AC97_WM9712_POWER       0x24
  79 #define AC97_WM9712_REV         0x58
  80
  81 /* WM9705 Bits */
  82 #define WM9705_PDEN             0x1000  /* measure only when pen is down */
  83 #define WM9705_PINV             0x0800  /* inverts sense of pen down output */
  84 #define WM9705_BSEN             0x0400  /* BUSY flag enable, pin47 is 1 when busy */
  85 #define WM9705_BINV             0x0200  /* invert BUSY (pin47) output */
  86 #define WM9705_WAIT             0x0100  /* wait until adc is read before next sample */
  87 #define WM9705_PIL              0x0080  /* current used for pressure measurement. set 400uA else 200uA */
  88 #define WM9705_PHIZ             0x0040  /* set PHONE and PCBEEP inputs to high impedance */
  89 #define WM9705_MASK_HI          0x0010  /* hi on mask stops conversions */
  90 #define WM9705_MASK_EDGE        0x0020  /* rising/falling edge on pin delays sample */
  91 #define WM9705_MASK_SYNC        0x0030  /* rising/falling edge on mask initiates sample */
  92 #define WM9705_PDD(i)           (i & 0x000f)    /* pen detect comparator threshold */
  93
  94
  95 /* WM9713 Bits */
  96 #define WM9713_PDPOL            0x0400  /* Pen down polarity */
  97 #define WM9713_POLL             0x0200  /* initiate a polling measurement */
  98 #define WM9713_CTC              0x0100  /* enable continuous mode */
  99 #define WM9713_ADCSEL_X         0x0002  /* X measurement */
 100 #define WM9713_ADCSEL_Y         0x0004  /* Y measurement */
 101 #define WM9713_ADCSEL_PRES      0x0008  /* Pressure measurement */
 102 #define WM9713_COO              0x0001  /* enable coordinate mode */
 103 #define WM9713_45W              0x1000  /* set for 5 wire panel */
 104 #define WM9713_PDEN             0x0800  /* measure only when pen down */
 105 #define WM9713_ADCSEL_MASK      0x00fe  /* ADC selection mask */
 106 #define WM9713_WAIT             0x0200  /* coordinate wait */
 107
 108 /* AUX ADC ID's */
 109 #define TS_COMP1                0x0
 110 #define TS_COMP2                0x1
 111 #define TS_BMON                 0x2
 112 #define TS_WIPER                0x3
 113
 114 /* ID numbers */
 115 #define WM97XX_ID1              0x574d
 116 #define WM9712_ID2              0x4c12
 117 #define WM9705_ID2              0x4c05
 118 #define WM9713_ID2              0x4c13
 119
 120 /* Codec GPIO's */
 121 #define WM97XX_MAX_GPIO         16
 122 #define WM97XX_GPIO_1           (1 << 1)
 123 #define WM97XX_GPIO_2           (1 << 2)
 124 #define WM97XX_GPIO_3           (1 << 3)
 125 #define WM97XX_GPIO_4           (1 << 4)
 126 #define WM97XX_GPIO_5           (1 << 5)
 127 #define WM97XX_GPIO_6           (1 << 6)
 128 #define WM97XX_GPIO_7           (1 << 7)
 129 #define WM97XX_GPIO_8           (1 << 8)
 130 #define WM97XX_GPIO_9           (1 << 9)
 131 #define WM97XX_GPIO_10          (1 << 10)
 132 #define WM97XX_GPIO_11          (1 << 11)
 133 #define WM97XX_GPIO_12          (1 << 12)
 134 #define WM97XX_GPIO_13          (1 << 13)
 135 #define WM97XX_GPIO_14          (1 << 14)
 136 #define WM97XX_GPIO_15          (1 << 15)
 137
 138
 139 #define AC97_LINK_FRAME         21      /* time in uS for AC97 link frame */
 140
 141
 142 /*---------------- Return codes from sample reading functions ---------------*/
 143
 144 /* More data is available; call the sample gathering function again */
 145 #define RC_AGAIN                        0x00000001
 146 /* The returned sample is valid */
 147 #define RC_VALID                        0x00000002
 148 /* The pen is up (the first RC_VALID without RC_PENUP means pen is down) */
 149 #define RC_PENUP                        0x00000004
 150 /* The pen is down (RC_VALID implies RC_PENDOWN, but sometimes it is helpful
 151    to tell the handler that the pen is down but we don't know yet his coords,
 152    so the handler should not sleep or wait for pendown irq) */
 153 #define RC_PENDOWN                      0x00000008
 154
 155 /*
 156  * The wm97xx driver provides a private API for writing platform-specific
 157  * drivers.
 158  */
 159
 160 /* The structure used to return arch specific sampled data into */
 161 struct wm97xx_data {
 162     int x;
 163     int y;
 164     int p;
 165 };
 166
 167 /*
 168  * Codec GPIO status
 169  */
 170 enum wm97xx_gpio_status {
 171     WM97XX_GPIO_HIGH,
 172     WM97XX_GPIO_LOW
 173 };
 174
 175 /*
 176  * Codec GPIO direction
 177  */
 178 enum wm97xx_gpio_dir {
 179     WM97XX_GPIO_IN,
 180     WM97XX_GPIO_OUT
 181 };
 182
 183 /*
 184  * Codec GPIO polarity
 185  */
 186 enum wm97xx_gpio_pol {
 187     WM97XX_GPIO_POL_HIGH,
 188     WM97XX_GPIO_POL_LOW
 189 };
 190
 191 /*
 192  * Codec GPIO sticky
 193  */
 194 enum wm97xx_gpio_sticky {
 195     WM97XX_GPIO_STICKY,
 196     WM97XX_GPIO_NOTSTICKY
 197 };
 198
 199 /*
 200  * Codec GPIO wake
 201  */
 202 enum wm97xx_gpio_wake {
 203     WM97XX_GPIO_WAKE,
 204     WM97XX_GPIO_NOWAKE
 205 };
 206
 207 /*
 208  * Digitiser ioctl commands
 209  */
 210 #define WM97XX_DIG_START        0x1
 211 #define WM97XX_DIG_STOP         0x2
 212 #define WM97XX_PHY_INIT         0x3
 213 #define WM97XX_AUX_PREPARE      0x4
 214 #define WM97XX_DIG_RESTORE      0x5
 215
 216 struct wm97xx;
 217
 218 extern struct wm97xx_codec_drv wm9705_codec;
 219 extern struct wm97xx_codec_drv wm9712_codec;
 220 extern struct wm97xx_codec_drv wm9713_codec;
 221
 222 /*
 223  * Codec driver interface - allows mapping to WM9705/12/13 and newer codecs
 224  */
 225 struct wm97xx_codec_drv {
 226         u16 id;
 227         char *name;
 228
 229         /* read 1 sample */
 230         int (*poll_sample) (struct wm97xx *, int adcsel, int *sample);
 231
 232         /* read X,Y,[P] in poll */
 233         int (*poll_touch) (struct wm97xx *, struct wm97xx_data *);
 234
 235         int (*acc_enable) (struct wm97xx *, int enable);
 236         void (*phy_init) (struct wm97xx *);
 237         void (*dig_enable) (struct wm97xx *, int enable);
 238         void (*dig_restore) (struct wm97xx *);
 239         void (*aux_prepare) (struct wm97xx *);
 240 };
 241
 242
 243 /* Machine specific and accelerated touch operations */
 244 struct wm97xx_mach_ops {
 245
 246         /* accelerated touch readback - coords are transmited on AC97 link */
 247         int acc_enabled;
 248         void (*acc_pen_up) (struct wm97xx *);
 249         int (*acc_pen_down) (struct wm97xx *);
 250         int (*acc_startup) (struct wm97xx *);
 251         void (*acc_shutdown) (struct wm97xx *);
 252
 253         /* interrupt mask control - required for accelerated operation */
 254         void (*irq_enable) (struct wm97xx *, int enable);
 255
 256         /* GPIO pin used for accelerated operation */
 257         int irq_gpio;
 258
 259         /* pre and post sample - can be used to minimise any analog noise */
 260         void (*pre_sample) (int);  /* function to run before sampling */
 261         void (*post_sample) (int);  /* function to run after sampling */
 262 };
 263
 264 struct wm97xx {
 265         u16 dig[3], id, gpio[6], misc;  /* Cached codec registers */
 266         u16 dig_save[3];                /* saved during aux reading */
 267         struct wm97xx_codec_drv *codec; /* attached codec driver*/
 268         struct input_dev *input_dev;    /* touchscreen input device */
 269         struct snd_ac97 *ac97;          /* ALSA codec access */
 270         struct device *dev;             /* ALSA device */
 271         struct platform_device *battery_dev;
 272         struct platform_device *touch_dev;
 273         struct wm97xx_mach_ops *mach_ops;
 274         struct mutex codec_mutex;
 275         struct delayed_work ts_reader;  /* Used to poll touchscreen */
 276         unsigned long ts_reader_interval; /* Current interval for timer */
 277         unsigned long ts_reader_min_interval; /* Minimum interval */
 278         unsigned int pen_irq;           /* Pen IRQ number in use */
 279         struct workqueue_struct *ts_workq;
 280         struct work_struct pen_event_work;
 281         u16 acc_slot;                   /* AC97 slot used for acc touch data */
 282         u16 acc_rate;                   /* acc touch data rate */
 283         unsigned pen_is_down:1;         /* Pen is down */
 284         unsigned aux_waiting:1;         /* aux measurement waiting */
 285         unsigned pen_probably_down:1;   /* used in polling mode */
 286         u16 suspend_mode;               /* PRP in suspend mode */
 287 };
 288
 289 /*
 290  * Codec GPIO access (not supported on WM9705)
 291  * This can be used to set/get codec GPIO and Virtual GPIO status.
 292  */
 293 enum wm97xx_gpio_status wm97xx_get_gpio(struct wm97xx *wm, u32 gpio);
 294 void wm97xx_set_gpio(struct wm97xx *wm, u32 gpio,
 295                           enum wm97xx_gpio_status status);
 296 void wm97xx_config_gpio(struct wm97xx *wm, u32 gpio,
 297                                      enum wm97xx_gpio_dir dir,
 298                                      enum wm97xx_gpio_pol pol,
 299                                      enum wm97xx_gpio_sticky sticky,
 300                                      enum wm97xx_gpio_wake wake);
 301
 302 void wm97xx_set_suspend_mode(struct wm97xx *wm, u16 mode);
 303
 304 /* codec AC97 IO access */
 305 int wm97xx_reg_read(struct wm97xx *wm, u16 reg);
 306 void wm97xx_reg_write(struct wm97xx *wm, u16 reg, u16 val);
 307
 308 /* aux adc readback */
 309 int wm97xx_read_aux_adc(struct wm97xx *wm, u16 adcsel);
 310
 311 /* machine ops */
 312 int wm97xx_register_mach_ops(struct wm97xx *, struct wm97xx_mach_ops *);
 313 void wm97xx_unregister_mach_ops(struct wm97xx *);
 314
 315 #endif