kernel/drivers/iio/frequency/ad9523.c

   1 /*
   2  * AD9523 SPI Low Jitter Clock Generator
   3  *
   4  * Copyright 2012 Analog Devices Inc.
   5  *
   6  * Licensed under the GPL-2.
   7  */
   8
   9 #include <linux/device.h>
  10 #include <linux/kernel.h>
  11 #include <linux/slab.h>
  12 #include <linux/sysfs.h>
  13 #include <linux/spi/spi.h>
  14 #include <linux/regulator/consumer.h>
  15 #include <linux/err.h>
  16 #include <linux/module.h>
  17 #include <linux/delay.h>
  18
  19 #include <linux/iio/iio.h>
  20 #include <linux/iio/sysfs.h>
  21 #include <linux/iio/frequency/ad9523.h>
  22
  23 #define AD9523_READ     (1 << 15)
  24 #define AD9523_WRITE    (0 << 15)
  25 #define AD9523_CNT(x)   (((x) - 1) << 13)
  26 #define AD9523_ADDR(x)  ((x) & 0xFFF)
  27
  28 #define AD9523_R1B      (1 << 16)
  29 #define AD9523_R2B      (2 << 16)
  30 #define AD9523_R3B      (3 << 16)
  31 #define AD9523_TRANSF_LEN(x)                    ((x) >> 16)
  32
  33 #define AD9523_SERIAL_PORT_CONFIG               (AD9523_R1B | 0x0)
  34 #define AD9523_VERSION_REGISTER                 (AD9523_R1B | 0x2)
  35 #define AD9523_PART_REGISTER                    (AD9523_R1B | 0x3)
  36 #define AD9523_READBACK_CTRL                    (AD9523_R1B | 0x4)
  37
  38 #define AD9523_EEPROM_CUSTOMER_VERSION_ID       (AD9523_R2B | 0x6)
  39
  40 #define AD9523_PLL1_REF_A_DIVIDER               (AD9523_R2B | 0x11)
  41 #define AD9523_PLL1_REF_B_DIVIDER               (AD9523_R2B | 0x13)
  42 #define AD9523_PLL1_REF_TEST_DIVIDER            (AD9523_R1B | 0x14)
  43 #define AD9523_PLL1_FEEDBACK_DIVIDER            (AD9523_R2B | 0x17)
  44 #define AD9523_PLL1_CHARGE_PUMP_CTRL            (AD9523_R2B | 0x19)
  45 #define AD9523_PLL1_INPUT_RECEIVERS_CTRL        (AD9523_R1B | 0x1A)
  46 #define AD9523_PLL1_REF_CTRL                    (AD9523_R1B | 0x1B)
  47 #define AD9523_PLL1_MISC_CTRL                   (AD9523_R1B | 0x1C)
  48 #define AD9523_PLL1_LOOP_FILTER_CTRL            (AD9523_R1B | 0x1D)
  49
  50 #define AD9523_PLL2_CHARGE_PUMP                 (AD9523_R1B | 0xF0)
  51 #define AD9523_PLL2_FEEDBACK_DIVIDER_AB         (AD9523_R1B | 0xF1)
  52 #define AD9523_PLL2_CTRL                        (AD9523_R1B | 0xF2)
  53 #define AD9523_PLL2_VCO_CTRL                    (AD9523_R1B | 0xF3)
  54 #define AD9523_PLL2_VCO_DIVIDER                 (AD9523_R1B | 0xF4)
  55 #define AD9523_PLL2_LOOP_FILTER_CTRL            (AD9523_R2B | 0xF6)
  56 #define AD9523_PLL2_R2_DIVIDER                  (AD9523_R1B | 0xF7)
  57
  58 #define AD9523_CHANNEL_CLOCK_DIST(ch)           (AD9523_R3B | (0x192 + 3 * ch))
  59
  60 #define AD9523_PLL1_OUTPUT_CTRL                 (AD9523_R1B | 0x1BA)
  61 #define AD9523_PLL1_OUTPUT_CHANNEL_CTRL         (AD9523_R1B | 0x1BB)
  62
  63 #define AD9523_READBACK_0                       (AD9523_R1B | 0x22C)
  64 #define AD9523_READBACK_1                       (AD9523_R1B | 0x22D)
  65
  66 #define AD9523_STATUS_SIGNALS                   (AD9523_R3B | 0x232)
  67 #define AD9523_POWER_DOWN_CTRL                  (AD9523_R1B | 0x233)
  68 #define AD9523_IO_UPDATE                        (AD9523_R1B | 0x234)
  69
  70 #define AD9523_EEPROM_DATA_XFER_STATUS          (AD9523_R1B | 0xB00)
  71 #define AD9523_EEPROM_ERROR_READBACK            (AD9523_R1B | 0xB01)
  72 #define AD9523_EEPROM_CTRL1                     (AD9523_R1B | 0xB02)
  73 #define AD9523_EEPROM_CTRL2                     (AD9523_R1B | 0xB03)
  74
  75 /* AD9523_SERIAL_PORT_CONFIG */
  76
  77 #define AD9523_SER_CONF_SDO_ACTIVE              (1 << 7)
  78 #define AD9523_SER_CONF_SOFT_RESET              (1 << 5)
  79
  80 /* AD9523_READBACK_CTRL */
  81 #define AD9523_READBACK_CTRL_READ_BUFFERED      (1 << 0)
  82
  83 /* AD9523_PLL1_CHARGE_PUMP_CTRL */
  84 #define AD9523_PLL1_CHARGE_PUMP_CURRENT_nA(x)   (((x) / 500) & 0x7F)
  85 #define AD9523_PLL1_CHARGE_PUMP_TRISTATE        (1 << 7)
  86 #define AD9523_PLL1_CHARGE_PUMP_MODE_NORMAL     (3 << 8)
  87 #define AD9523_PLL1_CHARGE_PUMP_MODE_PUMP_DOWN  (2 << 8)
  88 #define AD9523_PLL1_CHARGE_PUMP_MODE_PUMP_UP    (1 << 8)
  89 #define AD9523_PLL1_CHARGE_PUMP_MODE_TRISTATE   (0 << 8)
  90 #define AD9523_PLL1_BACKLASH_PW_MIN             (0 << 10)
  91 #define AD9523_PLL1_BACKLASH_PW_LOW             (1 << 10)
  92 #define AD9523_PLL1_BACKLASH_PW_HIGH            (2 << 10)
  93 #define AD9523_PLL1_BACKLASH_PW_MAX             (3 << 10)
  94
  95 /* AD9523_PLL1_INPUT_RECEIVERS_CTRL */
  96 #define AD9523_PLL1_REF_TEST_RCV_EN             (1 << 7)
  97 #define AD9523_PLL1_REFB_DIFF_RCV_EN            (1 << 6)
  98 #define AD9523_PLL1_REFA_DIFF_RCV_EN            (1 << 5)
  99 #define AD9523_PLL1_REFB_RCV_EN                 (1 << 4)
 100 #define AD9523_PLL1_REFA_RCV_EN                 (1 << 3)
 101 #define AD9523_PLL1_REFA_REFB_PWR_CTRL_EN       (1 << 2)
 102 #define AD9523_PLL1_OSC_IN_CMOS_NEG_INP_EN      (1 << 1)
 103 #define AD9523_PLL1_OSC_IN_DIFF_EN              (1 << 0)
 104
 105 /* AD9523_PLL1_REF_CTRL */
 106 #define AD9523_PLL1_BYPASS_REF_TEST_DIV_EN      (1 << 7)
 107 #define AD9523_PLL1_BYPASS_FEEDBACK_DIV_EN      (1 << 6)
 108 #define AD9523_PLL1_ZERO_DELAY_MODE_INT         (1 << 5)
 109 #define AD9523_PLL1_ZERO_DELAY_MODE_EXT         (0 << 5)
 110 #define AD9523_PLL1_OSC_IN_PLL_FEEDBACK_EN      (1 << 4)
 111 #define AD9523_PLL1_ZD_IN_CMOS_NEG_INP_EN       (1 << 3)
 112 #define AD9523_PLL1_ZD_IN_DIFF_EN               (1 << 2)
 113 #define AD9523_PLL1_REFB_CMOS_NEG_INP_EN        (1 << 1)
 114 #define AD9523_PLL1_REFA_CMOS_NEG_INP_EN        (1 << 0)
 115
 116 /* AD9523_PLL1_MISC_CTRL */
 117 #define AD9523_PLL1_REFB_INDEP_DIV_CTRL_EN      (1 << 7)
 118 #define AD9523_PLL1_OSC_CTRL_FAIL_VCC_BY2_EN    (1 << 6)
 119 #define AD9523_PLL1_REF_MODE(x)                 ((x) << 2)
 120 #define AD9523_PLL1_BYPASS_REFB_DIV             (1 << 1)
 121 #define AD9523_PLL1_BYPASS_REFA_DIV             (1 << 0)
 122
 123 /* AD9523_PLL1_LOOP_FILTER_CTRL */
 124 #define AD9523_PLL1_LOOP_FILTER_RZERO(x)        ((x) & 0xF)
 125
 126 /* AD9523_PLL2_CHARGE_PUMP */
 127 #define AD9523_PLL2_CHARGE_PUMP_CURRENT_nA(x)   ((x) / 3500)
 128
 129 /* AD9523_PLL2_FEEDBACK_DIVIDER_AB */
 130 #define AD9523_PLL2_FB_NDIV_A_CNT(x)            (((x) & 0x3) << 6)
 131 #define AD9523_PLL2_FB_NDIV_B_CNT(x)            (((x) & 0x3F) << 0)
 132 #define AD9523_PLL2_FB_NDIV(a, b)               (4 * (b) + (a))
 133
 134 /* AD9523_PLL2_CTRL */
 135 #define AD9523_PLL2_CHARGE_PUMP_MODE_NORMAL     (3 << 0)
 136 #define AD9523_PLL2_CHARGE_PUMP_MODE_PUMP_DOWN  (2 << 0)
 137 #define AD9523_PLL2_CHARGE_PUMP_MODE_PUMP_UP    (1 << 0)
 138 #define AD9523_PLL2_CHARGE_PUMP_MODE_TRISTATE   (0 << 0)
 139 #define AD9523_PLL2_BACKLASH_PW_MIN             (0 << 2)
 140 #define AD9523_PLL2_BACKLASH_PW_LOW             (1 << 2)
 141 #define AD9523_PLL2_BACKLASH_PW_HIGH            (2 << 2)
 142 #define AD9523_PLL2_BACKLASH_PW_MAX             (3 << 1)
 143 #define AD9523_PLL2_BACKLASH_CTRL_EN            (1 << 4)
 144 #define AD9523_PLL2_FREQ_DOUBLER_EN             (1 << 5)
 145 #define AD9523_PLL2_LOCK_DETECT_PWR_DOWN_EN     (1 << 7)
 146
 147 /* AD9523_PLL2_VCO_CTRL */
 148 #define AD9523_PLL2_VCO_CALIBRATE               (1 << 1)
 149 #define AD9523_PLL2_FORCE_VCO_MIDSCALE          (1 << 2)
 150 #define AD9523_PLL2_FORCE_REFERENCE_VALID       (1 << 3)
 151 #define AD9523_PLL2_FORCE_RELEASE_SYNC          (1 << 4)
 152
 153 /* AD9523_PLL2_VCO_DIVIDER */
 154 #define AD9523_PLL2_VCO_DIV_M1(x)               ((((x) - 3) & 0x3) << 0)
 155 #define AD9523_PLL2_VCO_DIV_M2(x)               ((((x) - 3) & 0x3) << 4)
 156 #define AD9523_PLL2_VCO_DIV_M1_PWR_DOWN_EN      (1 << 2)
 157 #define AD9523_PLL2_VCO_DIV_M2_PWR_DOWN_EN      (1 << 6)
 158
 159 /* AD9523_PLL2_LOOP_FILTER_CTRL */
 160 #define AD9523_PLL2_LOOP_FILTER_CPOLE1(x)       (((x) & 0x7) << 0)
 161 #define AD9523_PLL2_LOOP_FILTER_RZERO(x)        (((x) & 0x7) << 3)
 162 #define AD9523_PLL2_LOOP_FILTER_RPOLE2(x)       (((x) & 0x7) << 6)
 163 #define AD9523_PLL2_LOOP_FILTER_RZERO_BYPASS_EN (1 << 8)
 164
 165 /* AD9523_PLL2_R2_DIVIDER */
 166 #define AD9523_PLL2_R2_DIVIDER_VAL(x)           (((x) & 0x1F) << 0)
 167
 168 /* AD9523_CHANNEL_CLOCK_DIST */
 169 #define AD9523_CLK_DIST_DIV_PHASE(x)            (((x) & 0x3F) << 18)
 170 #define AD9523_CLK_DIST_DIV_PHASE_REV(x)        ((ret >> 18) & 0x3F)
 171 #define AD9523_CLK_DIST_DIV(x)                  ((((x) - 1) & 0x3FF) << 8)
 172 #define AD9523_CLK_DIST_DIV_REV(x)              (((ret >> 8) & 0x3FF) + 1)
 173 #define AD9523_CLK_DIST_INV_DIV_OUTPUT_EN       (1 << 7)
 174 #define AD9523_CLK_DIST_IGNORE_SYNC_EN          (1 << 6)
 175 #define AD9523_CLK_DIST_PWR_DOWN_EN             (1 << 5)
 176 #define AD9523_CLK_DIST_LOW_PWR_MODE_EN         (1 << 4)
 177 #define AD9523_CLK_DIST_DRIVER_MODE(x)          (((x) & 0xF) << 0)
 178
 179 /* AD9523_PLL1_OUTPUT_CTRL */
 180 #define AD9523_PLL1_OUTP_CTRL_VCO_DIV_SEL_CH6_M2        (1 << 7)
 181 #define AD9523_PLL1_OUTP_CTRL_VCO_DIV_SEL_CH5_M2        (1 << 6)
 182 #define AD9523_PLL1_OUTP_CTRL_VCO_DIV_SEL_CH4_M2        (1 << 5)
 183 #define AD9523_PLL1_OUTP_CTRL_CMOS_DRV_WEAK             (1 << 4)
 184 #define AD9523_PLL1_OUTP_CTRL_OUTPUT_DIV_1              (0 << 0)
 185 #define AD9523_PLL1_OUTP_CTRL_OUTPUT_DIV_2              (1 << 0)
 186 #define AD9523_PLL1_OUTP_CTRL_OUTPUT_DIV_4              (2 << 0)
 187 #define AD9523_PLL1_OUTP_CTRL_OUTPUT_DIV_8              (4 << 0)
 188 #define AD9523_PLL1_OUTP_CTRL_OUTPUT_DIV_16             (8 << 0)
 189
 190 /* AD9523_PLL1_OUTPUT_CHANNEL_CTRL */
 191 #define AD9523_PLL1_OUTP_CH_CTRL_OUTPUT_PWR_DOWN_EN     (1 << 7)
 192 #define AD9523_PLL1_OUTP_CH_CTRL_VCO_DIV_SEL_CH9_M2     (1 << 6)
 193 #define AD9523_PLL1_OUTP_CH_CTRL_VCO_DIV_SEL_CH8_M2     (1 << 5)
 194 #define AD9523_PLL1_OUTP_CH_CTRL_VCO_DIV_SEL_CH7_M2     (1 << 4)
 195 #define AD9523_PLL1_OUTP_CH_CTRL_VCXO_SRC_SEL_CH3       (1 << 3)
 196 #define AD9523_PLL1_OUTP_CH_CTRL_VCXO_SRC_SEL_CH2       (1 << 2)
 197 #define AD9523_PLL1_OUTP_CH_CTRL_VCXO_SRC_SEL_CH1       (1 << 1)
 198 #define AD9523_PLL1_OUTP_CH_CTRL_VCXO_SRC_SEL_CH0       (1 << 0)
 199
 200 /* AD9523_READBACK_0 */
 201 #define AD9523_READBACK_0_STAT_PLL2_REF_CLK             (1 << 7)
 202 #define AD9523_READBACK_0_STAT_PLL2_FB_CLK              (1 << 6)
 203 #define AD9523_READBACK_0_STAT_VCXO                     (1 << 5)
 204 #define AD9523_READBACK_0_STAT_REF_TEST                 (1 << 4)
 205 #define AD9523_READBACK_0_STAT_REFB                     (1 << 3)
 206 #define AD9523_READBACK_0_STAT_REFA                     (1 << 2)
 207 #define AD9523_READBACK_0_STAT_PLL2_LD                  (1 << 1)
 208 #define AD9523_READBACK_0_STAT_PLL1_LD                  (1 << 0)
 209
 210 /* AD9523_READBACK_1 */
 211 #define AD9523_READBACK_1_HOLDOVER_ACTIVE               (1 << 3)
 212 #define AD9523_READBACK_1_AUTOMODE_SEL_REFB             (1 << 2)
 213 #define AD9523_READBACK_1_VCO_CALIB_IN_PROGRESS         (1 << 0)
 214
 215 /* AD9523_STATUS_SIGNALS */
 216 #define AD9523_STATUS_SIGNALS_SYNC_MAN_CTRL             (1 << 16)
 217 #define AD9523_STATUS_MONITOR_01_PLL12_LOCKED           (0x302)
 218 /* AD9523_POWER_DOWN_CTRL */
 219 #define AD9523_POWER_DOWN_CTRL_PLL1_PWR_DOWN            (1 << 2)
 220 #define AD9523_POWER_DOWN_CTRL_PLL2_PWR_DOWN            (1 << 1)
 221 #define AD9523_POWER_DOWN_CTRL_DIST_PWR_DOWN            (1 << 0)
 222
 223 /* AD9523_IO_UPDATE */
 224 #define AD9523_IO_UPDATE_EN                             (1 << 0)
 225
 226 /* AD9523_EEPROM_DATA_XFER_STATUS */
 227 #define AD9523_EEPROM_DATA_XFER_IN_PROGRESS             (1 << 0)
 228
 229 /* AD9523_EEPROM_ERROR_READBACK */
 230 #define AD9523_EEPROM_ERROR_READBACK_FAIL               (1 << 0)
 231
 232 /* AD9523_EEPROM_CTRL1 */
 233 #define AD9523_EEPROM_CTRL1_SOFT_EEPROM                 (1 << 1)
 234 #define AD9523_EEPROM_CTRL1_EEPROM_WRITE_PROT_DIS       (1 << 0)
 235
 236 /* AD9523_EEPROM_CTRL2 */
 237 #define AD9523_EEPROM_CTRL2_REG2EEPROM                  (1 << 0)
 238
 239 #define AD9523_NUM_CHAN                                 14
 240 #define AD9523_NUM_CHAN_ALT_CLK_SRC                     10
 241
 242 /* Helpers to avoid excess line breaks */
 243 #define AD_IFE(_pde, _a, _b) ((pdata->_pde) ? _a : _b)
 244 #define AD_IF(_pde, _a) AD_IFE(_pde, _a, 0)
 245
 246 enum {
 247         AD9523_STAT_PLL1_LD,
 248         AD9523_STAT_PLL2_LD,
 249         AD9523_STAT_REFA,
 250         AD9523_STAT_REFB,
 251         AD9523_STAT_REF_TEST,
 252         AD9523_STAT_VCXO,
 253         AD9523_STAT_PLL2_FB_CLK,
 254         AD9523_STAT_PLL2_REF_CLK,
 255         AD9523_SYNC,
 256         AD9523_EEPROM,
 257 };
 258
 259 enum {
 260         AD9523_VCO1,
 261         AD9523_VCO2,
 262         AD9523_VCXO,
 263         AD9523_NUM_CLK_SRC,
 264 };
 265
 266 struct ad9523_state {
 267         struct spi_device               *spi;
 268         struct regulator                *reg;
 269         struct ad9523_platform_data     *pdata;
 270         struct iio_chan_spec            ad9523_channels[AD9523_NUM_CHAN];
 271
 272         unsigned long           vcxo_freq;
 273         unsigned long           vco_freq;
 274         unsigned long           vco_out_freq[AD9523_NUM_CLK_SRC];
 275         unsigned char           vco_out_map[AD9523_NUM_CHAN_ALT_CLK_SRC];
 276
 277         /*
 278          * DMA (thus cache coherency maintenance) requires the
 279          * transfer buffers to live in their own cache lines.
 280          */
 281         union {
 282                 __be32 d32;
 283                 u8 d8[4];
 284         } data[2] ____cacheline_aligned;
 285 };
 286
 287 static int ad9523_read(struct iio_dev *indio_dev, unsigned addr)
 288 {
 289         struct ad9523_state *st = iio_priv(indio_dev);
 290         int ret;
 291
 292         /* We encode the register size 1..3 bytes into the register address.
 293          * On transfer we get the size from the register datum, and make sure
 294          * the result is properly aligned.
 295          */
 296
 297         struct spi_transfer t[] = {
 298                 {
 299                         .tx_buf = &st->data[0].d8[2],
 300                         .len = 2,
 301                 }, {
 302                         .rx_buf = &st->data[1].d8[4 - AD9523_TRANSF_LEN(addr)],
 303                         .len = AD9523_TRANSF_LEN(addr),
 304                 },
 305         };
 306
 307         st->data[0].d32 = cpu_to_be32(AD9523_READ |
 308                                       AD9523_CNT(AD9523_TRANSF_LEN(addr)) |
 309                                       AD9523_ADDR(addr));
 310
 311         ret = spi_sync_transfer(st->spi, t, ARRAY_SIZE(t));
 312         if (ret < 0)
 313                 dev_err(&indio_dev->dev, "read failed (%d)", ret);
 314         else
 315                 ret = be32_to_cpu(st->data[1].d32) & (0xFFFFFF >>
 316                                   (8 * (3 - AD9523_TRANSF_LEN(addr))));
 317
 318         return ret;
 319 };
 320
 321 static int ad9523_write(struct iio_dev *indio_dev, unsigned addr, unsigned val)
 322 {
 323         struct ad9523_state *st = iio_priv(indio_dev);
 324         int ret;
 325         struct spi_transfer t[] = {
 326                 {
 327                         .tx_buf = &st->data[0].d8[2],
 328                         .len = 2,
 329                 }, {
 330                         .tx_buf = &st->data[1].d8[4 - AD9523_TRANSF_LEN(addr)],
 331                         .len = AD9523_TRANSF_LEN(addr),
 332                 },
 333         };
 334
 335         st->data[0].d32 = cpu_to_be32(AD9523_WRITE |
 336                                       AD9523_CNT(AD9523_TRANSF_LEN(addr)) |
 337                                       AD9523_ADDR(addr));
 338         st->data[1].d32 = cpu_to_be32(val);
 339
 340         ret = spi_sync_transfer(st->spi, t, ARRAY_SIZE(t));
 341
 342         if (ret < 0)
 343                 dev_err(&indio_dev->dev, "write failed (%d)", ret);
 344
 345         return ret;
 346 }
 347
 348 static int ad9523_io_update(struct iio_dev *indio_dev)
 349 {
 350         return ad9523_write(indio_dev, AD9523_IO_UPDATE, AD9523_IO_UPDATE_EN);
 351 }
 352
 353 static int ad9523_vco_out_map(struct iio_dev *indio_dev,
 354                               unsigned ch, unsigned out)
 355 {
 356         struct ad9523_state *st = iio_priv(indio_dev);
 357         int ret;
 358         unsigned mask;
 359
 360         switch (ch) {
 361         case 0 ... 3:
 362                 ret = ad9523_read(indio_dev, AD9523_PLL1_OUTPUT_CHANNEL_CTRL);
 363                 if (ret < 0)
 364                         break;
 365                 mask = AD9523_PLL1_OUTP_CH_CTRL_VCXO_SRC_SEL_CH0 << ch;
 366                 if (out) {
 367                         ret |= mask;
 368                         out = 2;
 369                 } else {
 370                         ret &= ~mask;
 371                 }
 372                 ret = ad9523_write(indio_dev,
 373                                    AD9523_PLL1_OUTPUT_CHANNEL_CTRL, ret);
 374                 break;
 375         case 4 ... 6:
 376                 ret = ad9523_read(indio_dev, AD9523_PLL1_OUTPUT_CTRL);
 377                 if (ret < 0)
 378                         break;
 379                 mask = AD9523_PLL1_OUTP_CTRL_VCO_DIV_SEL_CH4_M2 << (ch - 4);
 380                 if (out)
 381                         ret |= mask;
 382                 else
 383                         ret &= ~mask;
 384                 ret = ad9523_write(indio_dev, AD9523_PLL1_OUTPUT_CTRL, ret);
 385                 break;
 386         case 7 ... 9:
 387                 ret = ad9523_read(indio_dev, AD9523_PLL1_OUTPUT_CHANNEL_CTRL);
 388                 if (ret < 0)
 389                         break;
 390                 mask = AD9523_PLL1_OUTP_CH_CTRL_VCO_DIV_SEL_CH7_M2 << (ch - 7);
 391                 if (out)
 392                         ret |= mask;
 393                 else
 394                         ret &= ~mask;
 395                 ret = ad9523_write(indio_dev,
 396                                    AD9523_PLL1_OUTPUT_CHANNEL_CTRL, ret);
 397                 break;
 398         default:
 399                 return 0;
 400         }
 401
 402         st->vco_out_map[ch] = out;
 403
 404         return ret;
 405 }
 406
 407 static int ad9523_set_clock_provider(struct iio_dev *indio_dev,
 408                               unsigned ch, unsigned long freq)
 409 {
 410         struct ad9523_state *st = iio_priv(indio_dev);
 411         long tmp1, tmp2;
 412         bool use_alt_clk_src;
 413
 414         switch (ch) {
 415         case 0 ... 3:
 416                 use_alt_clk_src = (freq == st->vco_out_freq[AD9523_VCXO]);
 417                 break;
 418         case 4 ... 9:
 419                 tmp1 = st->vco_out_freq[AD9523_VCO1] / freq;
 420                 tmp2 = st->vco_out_freq[AD9523_VCO2] / freq;
 421                 tmp1 *= freq;
 422                 tmp2 *= freq;
 423                 use_alt_clk_src = (abs(tmp1 - freq) > abs(tmp2 - freq));
 424                 break;
 425         default:
 426                 /* Ch 10..14: No action required, return success */
 427                 return 0;
 428         }
 429
 430         return ad9523_vco_out_map(indio_dev, ch, use_alt_clk_src);
 431 }
 432
 433 static int ad9523_store_eeprom(struct iio_dev *indio_dev)
 434 {
 435         int ret, tmp;
 436
 437         ret = ad9523_write(indio_dev, AD9523_EEPROM_CTRL1,
 438                            AD9523_EEPROM_CTRL1_EEPROM_WRITE_PROT_DIS);
 439         if (ret < 0)
 440                 return ret;
 441         ret = ad9523_write(indio_dev, AD9523_EEPROM_CTRL2,
 442                            AD9523_EEPROM_CTRL2_REG2EEPROM);
 443         if (ret < 0)
 444                 return ret;
 445
 446         tmp = 4;
 447         do {
 448                 msleep(20);
 449                 ret = ad9523_read(indio_dev,
 450                                   AD9523_EEPROM_DATA_XFER_STATUS);
 451                 if (ret < 0)
 452                         return ret;
 453         } while ((ret & AD9523_EEPROM_DATA_XFER_IN_PROGRESS) && tmp--);
 454
 455         ret = ad9523_write(indio_dev, AD9523_EEPROM_CTRL1, 0);
 456         if (ret < 0)
 457                 return ret;
 458
 459         ret = ad9523_read(indio_dev, AD9523_EEPROM_ERROR_READBACK);
 460         if (ret < 0)
 461                 return ret;
 462
 463         if (ret & AD9523_EEPROM_ERROR_READBACK_FAIL) {
 464                 dev_err(&indio_dev->dev, "Verify EEPROM failed");
 465                 ret = -EIO;
 466         }
 467
 468         return ret;
 469 }
 470
 471 static int ad9523_sync(struct iio_dev *indio_dev)
 472 {
 473         int ret, tmp;
 474
 475         ret = ad9523_read(indio_dev, AD9523_STATUS_SIGNALS);
 476         if (ret < 0)
 477                 return ret;
 478
 479         tmp = ret;
 480         tmp |= AD9523_STATUS_SIGNALS_SYNC_MAN_CTRL;
 481
 482         ret = ad9523_write(indio_dev, AD9523_STATUS_SIGNALS, tmp);
 483         if (ret < 0)
 484                 return ret;
 485
 486         ad9523_io_update(indio_dev);
 487         tmp &= ~AD9523_STATUS_SIGNALS_SYNC_MAN_CTRL;
 488
 489         ret = ad9523_write(indio_dev, AD9523_STATUS_SIGNALS, tmp);
 490         if (ret < 0)
 491                 return ret;
 492
 493         return ad9523_io_update(indio_dev);
 494 }
 495
 496 static ssize_t ad9523_store(struct device *dev,
 497                                 struct device_attribute *attr,
 498                                 const char *buf, size_t len)
 499 {
 500         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 501         struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
 502         bool state;
 503         int ret;
 504
 505         ret = strtobool(buf, &state);
 506         if (ret < 0)
 507                 return ret;
 508
 509         if (!state)
 510                 return 0;
 511
 512         mutex_lock(&indio_dev->mlock);
 513         switch ((u32)this_attr->address) {
 514         case AD9523_SYNC:
 515                 ret = ad9523_sync(indio_dev);
 516                 break;
 517         case AD9523_EEPROM:
 518                 ret = ad9523_store_eeprom(indio_dev);
 519                 break;
 520         default:
 521                 ret = -ENODEV;
 522         }
 523         mutex_unlock(&indio_dev->mlock);
 524
 525         return ret ? ret : len;
 526 }
 527
 528 static ssize_t ad9523_show(struct device *dev,
 529                         struct device_attribute *attr,
 530                         char *buf)
 531 {
 532         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 533         struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
 534         int ret;
 535
 536         mutex_lock(&indio_dev->mlock);
 537         ret = ad9523_read(indio_dev, AD9523_READBACK_0);
 538         if (ret >= 0) {
 539                 ret = sprintf(buf, "%d\n", !!(ret & (1 <<
 540                         (u32)this_attr->address)));
 541         }
 542         mutex_unlock(&indio_dev->mlock);
 543
 544         return ret;
 545 }
 546
 547 static IIO_DEVICE_ATTR(pll1_locked, S_IRUGO,
 548                         ad9523_show,
 549                         NULL,
 550                         AD9523_STAT_PLL1_LD);
 551
 552 static IIO_DEVICE_ATTR(pll2_locked, S_IRUGO,
 553                         ad9523_show,
 554                         NULL,
 555                         AD9523_STAT_PLL2_LD);
 556
 557 static IIO_DEVICE_ATTR(pll1_reference_clk_a_present, S_IRUGO,
 558                         ad9523_show,
 559                         NULL,
 560                         AD9523_STAT_REFA);
 561
 562 static IIO_DEVICE_ATTR(pll1_reference_clk_b_present, S_IRUGO,
 563                         ad9523_show,
 564                         NULL,
 565                         AD9523_STAT_REFB);
 566
 567 static IIO_DEVICE_ATTR(pll1_reference_clk_test_present, S_IRUGO,
 568                         ad9523_show,
 569                         NULL,
 570                         AD9523_STAT_REF_TEST);
 571
 572 static IIO_DEVICE_ATTR(vcxo_clk_present, S_IRUGO,
 573                         ad9523_show,
 574                         NULL,
 575                         AD9523_STAT_VCXO);
 576
 577 static IIO_DEVICE_ATTR(pll2_feedback_clk_present, S_IRUGO,
 578                         ad9523_show,
 579                         NULL,
 580                         AD9523_STAT_PLL2_FB_CLK);
 581
 582 static IIO_DEVICE_ATTR(pll2_reference_clk_present, S_IRUGO,
 583                         ad9523_show,
 584                         NULL,
 585                         AD9523_STAT_PLL2_REF_CLK);
 586
 587 static IIO_DEVICE_ATTR(sync_dividers, S_IWUSR,
 588                         NULL,
 589                         ad9523_store,
 590                         AD9523_SYNC);
 591
 592 static IIO_DEVICE_ATTR(store_eeprom, S_IWUSR,
 593                         NULL,
 594                         ad9523_store,
 595                         AD9523_EEPROM);
 596
 597 static struct attribute *ad9523_attributes[] = {
 598         &iio_dev_attr_sync_dividers.dev_attr.attr,
 599         &iio_dev_attr_store_eeprom.dev_attr.attr,
 600         &iio_dev_attr_pll2_feedback_clk_present.dev_attr.attr,
 601         &iio_dev_attr_pll2_reference_clk_present.dev_attr.attr,
 602         &iio_dev_attr_pll1_reference_clk_a_present.dev_attr.attr,
 603         &iio_dev_attr_pll1_reference_clk_b_present.dev_attr.attr,
 604         &iio_dev_attr_pll1_reference_clk_test_present.dev_attr.attr,
 605         &iio_dev_attr_vcxo_clk_present.dev_attr.attr,
 606         &iio_dev_attr_pll1_locked.dev_attr.attr,
 607         &iio_dev_attr_pll2_locked.dev_attr.attr,
 608         NULL,
 609 };
 610
 611 static const struct attribute_group ad9523_attribute_group = {
 612         .attrs = ad9523_attributes,
 613 };
 614
 615 static int ad9523_read_raw(struct iio_dev *indio_dev,
 616                            struct iio_chan_spec const *chan,
 617                            int *val,
 618                            int *val2,
 619                            long m)
 620 {
 621         struct ad9523_state *st = iio_priv(indio_dev);
 622         unsigned code;
 623         int ret;
 624
 625         mutex_lock(&indio_dev->mlock);
 626         ret = ad9523_read(indio_dev, AD9523_CHANNEL_CLOCK_DIST(chan->channel));
 627         mutex_unlock(&indio_dev->mlock);
 628
 629         if (ret < 0)
 630                 return ret;
 631
 632         switch (m) {
 633         case IIO_CHAN_INFO_RAW:
 634                 *val = !(ret & AD9523_CLK_DIST_PWR_DOWN_EN);
 635                 return IIO_VAL_INT;
 636         case IIO_CHAN_INFO_FREQUENCY:
 637                 *val = st->vco_out_freq[st->vco_out_map[chan->channel]] /
 638                         AD9523_CLK_DIST_DIV_REV(ret);
 639                 return IIO_VAL_INT;
 640         case IIO_CHAN_INFO_PHASE:
 641                 code = (AD9523_CLK_DIST_DIV_PHASE_REV(ret) * 3141592) /
 642                         AD9523_CLK_DIST_DIV_REV(ret);
 643                 *val = code / 1000000;
 644                 *val2 = (code % 1000000) * 10;
 645                 return IIO_VAL_INT_PLUS_MICRO;
 646         default:
 647                 return -EINVAL;
 648         }
 649 };
 650
 651 static int ad9523_write_raw(struct iio_dev *indio_dev,
 652                             struct iio_chan_spec const *chan,
 653                             int val,
 654                             int val2,
 655                             long mask)
 656 {
 657         struct ad9523_state *st = iio_priv(indio_dev);
 658         unsigned reg;
 659         int ret, tmp, code;
 660
 661         mutex_lock(&indio_dev->mlock);
 662         ret = ad9523_read(indio_dev, AD9523_CHANNEL_CLOCK_DIST(chan->channel));
 663         if (ret < 0)
 664                 goto out;
 665
 666         reg = ret;
 667
 668         switch (mask) {
 669         case IIO_CHAN_INFO_RAW:
 670                 if (val)
 671                         reg &= ~AD9523_CLK_DIST_PWR_DOWN_EN;
 672                 else
 673                         reg |= AD9523_CLK_DIST_PWR_DOWN_EN;
 674                 break;
 675         case IIO_CHAN_INFO_FREQUENCY:
 676                 if (val <= 0) {
 677                         ret = -EINVAL;
 678                         goto out;
 679                 }
 680                 ret = ad9523_set_clock_provider(indio_dev, chan->channel, val);
 681                 if (ret < 0)
 682                         goto out;
 683                 tmp = st->vco_out_freq[st->vco_out_map[chan->channel]] / val;
 684                 tmp = clamp(tmp, 1, 1024);
 685                 reg &= ~(0x3FF << 8);
 686                 reg |= AD9523_CLK_DIST_DIV(tmp);
 687                 break;
 688         case IIO_CHAN_INFO_PHASE:
 689                 code = val * 1000000 + val2 % 1000000;
 690                 tmp = (code * AD9523_CLK_DIST_DIV_REV(ret)) / 3141592;
 691                 tmp = clamp(tmp, 0, 63);
 692                 reg &= ~AD9523_CLK_DIST_DIV_PHASE(~0);
 693                 reg |= AD9523_CLK_DIST_DIV_PHASE(tmp);
 694                 break;
 695         default:
 696                 ret = -EINVAL;
 697                 goto out;
 698         }
 699
 700         ret = ad9523_write(indio_dev, AD9523_CHANNEL_CLOCK_DIST(chan->channel),
 701                            reg);
 702         if (ret < 0)
 703                 goto out;
 704
 705         ad9523_io_update(indio_dev);
 706 out:
 707         mutex_unlock(&indio_dev->mlock);
 708         return ret;
 709 }
 710
 711 static int ad9523_reg_access(struct iio_dev *indio_dev,
 712                               unsigned reg, unsigned writeval,
 713                               unsigned *readval)
 714 {
 715         int ret;
 716
 717         mutex_lock(&indio_dev->mlock);
 718         if (readval == NULL) {
 719                 ret = ad9523_write(indio_dev, reg | AD9523_R1B, writeval);
 720                 ad9523_io_update(indio_dev);
 721         } else {
 722                 ret = ad9523_read(indio_dev, reg | AD9523_R1B);
 723                 if (ret < 0)
 724                         goto out_unlock;
 725                 *readval = ret;
 726                 ret = 0;
 727         }
 728
 729 out_unlock:
 730         mutex_unlock(&indio_dev->mlock);
 731
 732         return ret;
 733 }
 734
 735 static const struct iio_info ad9523_info = {
 736         .read_raw = &ad9523_read_raw,
 737         .write_raw = &ad9523_write_raw,
 738         .debugfs_reg_access = &ad9523_reg_access,
 739         .attrs = &ad9523_attribute_group,
 740         .driver_module = THIS_MODULE,
 741 };
 742
 743 static int ad9523_setup(struct iio_dev *indio_dev)
 744 {
 745         struct ad9523_state *st = iio_priv(indio_dev);
 746         struct ad9523_platform_data *pdata = st->pdata;
 747         struct ad9523_channel_spec *chan;
 748         unsigned long active_mask = 0;
 749         int ret, i;
 750
 751         ret = ad9523_write(indio_dev, AD9523_SERIAL_PORT_CONFIG,
 752                            AD9523_SER_CONF_SOFT_RESET |
 753                           (st->spi->mode & SPI_3WIRE ? 0 :
 754                           AD9523_SER_CONF_SDO_ACTIVE));
 755         if (ret < 0)
 756                 return ret;
 757
 758         ret = ad9523_write(indio_dev, AD9523_READBACK_CTRL,
 759                           AD9523_READBACK_CTRL_READ_BUFFERED);
 760         if (ret < 0)
 761                 return ret;
 762
 763         ret = ad9523_io_update(indio_dev);
 764         if (ret < 0)
 765                 return ret;
 766
 767         /*
 768          * PLL1 Setup
 769          */
 770         ret = ad9523_write(indio_dev, AD9523_PLL1_REF_A_DIVIDER,
 771                 pdata->refa_r_div);
 772         if (ret < 0)
 773                 return ret;
 774
 775         ret = ad9523_write(indio_dev, AD9523_PLL1_REF_B_DIVIDER,
 776                 pdata->refb_r_div);
 777         if (ret < 0)
 778                 return ret;
 779
 780         ret = ad9523_write(indio_dev, AD9523_PLL1_FEEDBACK_DIVIDER,
 781                 pdata->pll1_feedback_div);
 782         if (ret < 0)
 783                 return ret;
 784
 785         ret = ad9523_write(indio_dev, AD9523_PLL1_CHARGE_PUMP_CTRL,
 786                 AD9523_PLL1_CHARGE_PUMP_CURRENT_nA(pdata->
 787                         pll1_charge_pump_current_nA) |
 788                 AD9523_PLL1_CHARGE_PUMP_MODE_NORMAL |
 789                 AD9523_PLL1_BACKLASH_PW_MIN);
 790         if (ret < 0)
 791                 return ret;
 792
 793         ret = ad9523_write(indio_dev, AD9523_PLL1_INPUT_RECEIVERS_CTRL,
 794                 AD_IF(refa_diff_rcv_en, AD9523_PLL1_REFA_RCV_EN) |
 795                 AD_IF(refb_diff_rcv_en, AD9523_PLL1_REFB_RCV_EN) |
 796                 AD_IF(osc_in_diff_en, AD9523_PLL1_OSC_IN_DIFF_EN) |
 797                 AD_IF(osc_in_cmos_neg_inp_en,
 798                       AD9523_PLL1_OSC_IN_CMOS_NEG_INP_EN) |
 799                 AD_IF(refa_diff_rcv_en, AD9523_PLL1_REFA_DIFF_RCV_EN) |
 800                 AD_IF(refb_diff_rcv_en, AD9523_PLL1_REFB_DIFF_RCV_EN));
 801         if (ret < 0)
 802                 return ret;
 803
 804         ret = ad9523_write(indio_dev, AD9523_PLL1_REF_CTRL,
 805                 AD_IF(zd_in_diff_en, AD9523_PLL1_ZD_IN_DIFF_EN) |
 806                 AD_IF(zd_in_cmos_neg_inp_en,
 807                       AD9523_PLL1_ZD_IN_CMOS_NEG_INP_EN) |
 808                 AD_IF(zero_delay_mode_internal_en,
 809                       AD9523_PLL1_ZERO_DELAY_MODE_INT) |
 810                 AD_IF(osc_in_feedback_en, AD9523_PLL1_OSC_IN_PLL_FEEDBACK_EN) |
 811                 AD_IF(refa_cmos_neg_inp_en, AD9523_PLL1_REFA_CMOS_NEG_INP_EN) |
 812                 AD_IF(refb_cmos_neg_inp_en, AD9523_PLL1_REFB_CMOS_NEG_INP_EN));
 813         if (ret < 0)
 814                 return ret;
 815
 816         ret = ad9523_write(indio_dev, AD9523_PLL1_MISC_CTRL,
 817                 AD9523_PLL1_REFB_INDEP_DIV_CTRL_EN |
 818                 AD9523_PLL1_REF_MODE(pdata->ref_mode));
 819         if (ret < 0)
 820                 return ret;
 821
 822         ret = ad9523_write(indio_dev, AD9523_PLL1_LOOP_FILTER_CTRL,
 823                 AD9523_PLL1_LOOP_FILTER_RZERO(pdata->pll1_loop_filter_rzero));
 824         if (ret < 0)
 825                 return ret;
 826         /*
 827          * PLL2 Setup
 828          */
 829
 830         ret = ad9523_write(indio_dev, AD9523_PLL2_CHARGE_PUMP,
 831                 AD9523_PLL2_CHARGE_PUMP_CURRENT_nA(pdata->
 832                         pll2_charge_pump_current_nA));
 833         if (ret < 0)
 834                 return ret;
 835
 836         ret = ad9523_write(indio_dev, AD9523_PLL2_FEEDBACK_DIVIDER_AB,
 837                 AD9523_PLL2_FB_NDIV_A_CNT(pdata->pll2_ndiv_a_cnt) |
 838                 AD9523_PLL2_FB_NDIV_B_CNT(pdata->pll2_ndiv_b_cnt));
 839         if (ret < 0)
 840                 return ret;
 841
 842         ret = ad9523_write(indio_dev, AD9523_PLL2_CTRL,
 843                 AD9523_PLL2_CHARGE_PUMP_MODE_NORMAL |
 844                 AD9523_PLL2_BACKLASH_CTRL_EN |
 845                 AD_IF(pll2_freq_doubler_en, AD9523_PLL2_FREQ_DOUBLER_EN));
 846         if (ret < 0)
 847                 return ret;
 848
 849         st->vco_freq = (pdata->vcxo_freq * (pdata->pll2_freq_doubler_en ? 2 : 1)
 850                         / pdata->pll2_r2_div) * AD9523_PLL2_FB_NDIV(pdata->
 851                         pll2_ndiv_a_cnt, pdata->pll2_ndiv_b_cnt);
 852
 853         ret = ad9523_write(indio_dev, AD9523_PLL2_VCO_CTRL,
 854                 AD9523_PLL2_VCO_CALIBRATE);
 855         if (ret < 0)
 856                 return ret;
 857
 858         ret = ad9523_write(indio_dev, AD9523_PLL2_VCO_DIVIDER,
 859                 AD9523_PLL2_VCO_DIV_M1(pdata->pll2_vco_diff_m1) |
 860                 AD9523_PLL2_VCO_DIV_M2(pdata->pll2_vco_diff_m2) |
 861                 AD_IFE(pll2_vco_diff_m1, 0,
 862                        AD9523_PLL2_VCO_DIV_M1_PWR_DOWN_EN) |
 863                 AD_IFE(pll2_vco_diff_m2, 0,
 864                        AD9523_PLL2_VCO_DIV_M2_PWR_DOWN_EN));
 865         if (ret < 0)
 866                 return ret;
 867
 868         if (pdata->pll2_vco_diff_m1)
 869                 st->vco_out_freq[AD9523_VCO1] =
 870                         st->vco_freq / pdata->pll2_vco_diff_m1;
 871
 872         if (pdata->pll2_vco_diff_m2)
 873                 st->vco_out_freq[AD9523_VCO2] =
 874                         st->vco_freq / pdata->pll2_vco_diff_m2;
 875
 876         st->vco_out_freq[AD9523_VCXO] = pdata->vcxo_freq;
 877
 878         ret = ad9523_write(indio_dev, AD9523_PLL2_R2_DIVIDER,
 879                 AD9523_PLL2_R2_DIVIDER_VAL(pdata->pll2_r2_div));
 880         if (ret < 0)
 881                 return ret;
 882
 883         ret = ad9523_write(indio_dev, AD9523_PLL2_LOOP_FILTER_CTRL,
 884                 AD9523_PLL2_LOOP_FILTER_CPOLE1(pdata->cpole1) |
 885                 AD9523_PLL2_LOOP_FILTER_RZERO(pdata->rzero) |
 886                 AD9523_PLL2_LOOP_FILTER_RPOLE2(pdata->rpole2) |
 887                 AD_IF(rzero_bypass_en,
 888                       AD9523_PLL2_LOOP_FILTER_RZERO_BYPASS_EN));
 889         if (ret < 0)
 890                 return ret;
 891
 892         for (i = 0; i < pdata->num_channels; i++) {
 893                 chan = &pdata->channels[i];
 894                 if (chan->channel_num < AD9523_NUM_CHAN) {
 895                         __set_bit(chan->channel_num, &active_mask);
 896                         ret = ad9523_write(indio_dev,
 897                                 AD9523_CHANNEL_CLOCK_DIST(chan->channel_num),
 898                                 AD9523_CLK_DIST_DRIVER_MODE(chan->driver_mode) |
 899                                 AD9523_CLK_DIST_DIV(chan->channel_divider) |
 900                                 AD9523_CLK_DIST_DIV_PHASE(chan->divider_phase) |
 901                                 (chan->sync_ignore_en ?
 902                                         AD9523_CLK_DIST_IGNORE_SYNC_EN : 0) |
 903                                 (chan->divider_output_invert_en ?
 904                                         AD9523_CLK_DIST_INV_DIV_OUTPUT_EN : 0) |
 905                                 (chan->low_power_mode_en ?
 906                                         AD9523_CLK_DIST_LOW_PWR_MODE_EN : 0) |
 907                                 (chan->output_dis ?
 908                                         AD9523_CLK_DIST_PWR_DOWN_EN : 0));
 909                         if (ret < 0)
 910                                 return ret;
 911
 912                         ret = ad9523_vco_out_map(indio_dev, chan->channel_num,
 913                                            chan->use_alt_clock_src);
 914                         if (ret < 0)
 915                                 return ret;
 916
 917                         st->ad9523_channels[i].type = IIO_ALTVOLTAGE;
 918                         st->ad9523_channels[i].output = 1;
 919                         st->ad9523_channels[i].indexed = 1;
 920                         st->ad9523_channels[i].channel = chan->channel_num;
 921                         st->ad9523_channels[i].extend_name =
 922                                 chan->extended_name;
 923                         st->ad9523_channels[i].info_mask_separate =
 924                                 BIT(IIO_CHAN_INFO_RAW) |
 925                                 BIT(IIO_CHAN_INFO_PHASE) |
 926                                 BIT(IIO_CHAN_INFO_FREQUENCY);
 927                 }
 928         }
 929
 930         for_each_clear_bit(i, &active_mask, AD9523_NUM_CHAN)
 931                 ad9523_write(indio_dev,
 932                              AD9523_CHANNEL_CLOCK_DIST(i),
 933                              AD9523_CLK_DIST_DRIVER_MODE(TRISTATE) |
 934                              AD9523_CLK_DIST_PWR_DOWN_EN);
 935
 936         ret = ad9523_write(indio_dev, AD9523_POWER_DOWN_CTRL, 0);
 937         if (ret < 0)
 938                 return ret;
 939
 940         ret = ad9523_write(indio_dev, AD9523_STATUS_SIGNALS,
 941                            AD9523_STATUS_MONITOR_01_PLL12_LOCKED);
 942         if (ret < 0)
 943                 return ret;
 944
 945         ret = ad9523_io_update(indio_dev);
 946         if (ret < 0)
 947                 return ret;
 948
 949         return 0;
 950 }
 951
 952 static int ad9523_probe(struct spi_device *spi)
 953 {
 954         struct ad9523_platform_data *pdata = spi->dev.platform_data;
 955         struct iio_dev *indio_dev;
 956         struct ad9523_state *st;
 957         int ret;
 958
 959         if (!pdata) {
 960                 dev_err(&spi->dev, "no platform data?\n");
 961                 return -EINVAL;
 962         }
 963
 964         indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
 965         if (indio_dev == NULL)
 966                 return -ENOMEM;
 967
 968         st = iio_priv(indio_dev);
 969
 970         st->reg = devm_regulator_get(&spi->dev, "vcc");
 971         if (!IS_ERR(st->reg)) {
 972                 ret = regulator_enable(st->reg);
 973                 if (ret)
 974                         return ret;
 975         }
 976
 977         spi_set_drvdata(spi, indio_dev);
 978         st->spi = spi;
 979         st->pdata = pdata;
 980
 981         indio_dev->dev.parent = &spi->dev;
 982         indio_dev->name = (pdata->name[0] != 0) ? pdata->name :
 983                           spi_get_device_id(spi)->name;
 984         indio_dev->info = &ad9523_info;
 985         indio_dev->modes = INDIO_DIRECT_MODE;
 986         indio_dev->channels = st->ad9523_channels;
 987         indio_dev->num_channels = pdata->num_channels;
 988
 989         ret = ad9523_setup(indio_dev);
 990         if (ret < 0)
 991                 goto error_disable_reg;
 992
 993         ret = iio_device_register(indio_dev);
 994         if (ret)
 995                 goto error_disable_reg;
 996
 997         dev_info(&spi->dev, "probed %s\n", indio_dev->name);
 998
 999         return 0;
1000
1001 error_disable_reg:
1002         if (!IS_ERR(st->reg))
1003                 regulator_disable(st->reg);
1004
1005         return ret;
1006 }
1007
1008 static int ad9523_remove(struct spi_device *spi)
1009 {
1010         struct iio_dev *indio_dev = spi_get_drvdata(spi);
1011         struct ad9523_state *st = iio_priv(indio_dev);
1012
1013         iio_device_unregister(indio_dev);
1014
1015         if (!IS_ERR(st->reg))
1016                 regulator_disable(st->reg);
1017
1018         return 0;
1019 }
1020
1021 static const struct spi_device_id ad9523_id[] = {
1022         {"ad9523-1", 9523},
1023         {}
1024 };
1025 MODULE_DEVICE_TABLE(spi, ad9523_id);
1026
1027 static struct spi_driver ad9523_driver = {
1028         .driver = {
1029                 .name   = "ad9523",
1030                 .owner  = THIS_MODULE,
1031         },
1032         .probe          = ad9523_probe,
1033         .remove         = ad9523_remove,
1034         .id_table       = ad9523_id,
1035 };
1036 module_spi_driver(ad9523_driver);
1037
1038 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
1039 MODULE_DESCRIPTION("Analog Devices AD9523 CLOCKDIST/PLL");
1040 MODULE_LICENSE("GPL v2");