drivers/gpu/drm/i915/dvo_ch7017.c

   1 /*
   2  * Copyright © 2006 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  21  * DEALINGS IN THE SOFTWARE.
  22  *
  23  * Authors:
  24  *    Eric Anholt <eric@anholt.net>
  25  *
  26  */
  27
  28 #include "dvo.h"
  29
  30 #define CH7017_TV_DISPLAY_MODE          0x00
  31 #define CH7017_FLICKER_FILTER           0x01
  32 #define CH7017_VIDEO_BANDWIDTH          0x02
  33 #define CH7017_TEXT_ENHANCEMENT         0x03
  34 #define CH7017_START_ACTIVE_VIDEO       0x04
  35 #define CH7017_HORIZONTAL_POSITION      0x05
  36 #define CH7017_VERTICAL_POSITION        0x06
  37 #define CH7017_BLACK_LEVEL              0x07
  38 #define CH7017_CONTRAST_ENHANCEMENT     0x08
  39 #define CH7017_TV_PLL                   0x09
  40 #define CH7017_TV_PLL_M                 0x0a
  41 #define CH7017_TV_PLL_N                 0x0b
  42 #define CH7017_SUB_CARRIER_0            0x0c
  43 #define CH7017_CIV_CONTROL              0x10
  44 #define CH7017_CIV_0                    0x11
  45 #define CH7017_CHROMA_BOOST             0x14
  46 #define CH7017_CLOCK_MODE               0x1c
  47 #define CH7017_INPUT_CLOCK              0x1d
  48 #define CH7017_GPIO_CONTROL             0x1e
  49 #define CH7017_INPUT_DATA_FORMAT        0x1f
  50 #define CH7017_CONNECTION_DETECT        0x20
  51 #define CH7017_DAC_CONTROL              0x21
  52 #define CH7017_BUFFERED_CLOCK_OUTPUT    0x22
  53 #define CH7017_DEFEAT_VSYNC             0x47
  54 #define CH7017_TEST_PATTERN             0x48
  55
  56 #define CH7017_POWER_MANAGEMENT         0x49
  57 /** Enables the TV output path. */
  58 #define CH7017_TV_EN                    (1 << 0)
  59 #define CH7017_DAC0_POWER_DOWN          (1 << 1)
  60 #define CH7017_DAC1_POWER_DOWN          (1 << 2)
  61 #define CH7017_DAC2_POWER_DOWN          (1 << 3)
  62 #define CH7017_DAC3_POWER_DOWN          (1 << 4)
  63 /** Powers down the TV out block, and DAC0-3 */
  64 #define CH7017_TV_POWER_DOWN_EN         (1 << 5)
  65
  66 #define CH7017_VERSION_ID               0x4a
  67
  68 #define CH7017_DEVICE_ID                0x4b
  69 #define CH7017_DEVICE_ID_VALUE          0x1b
  70 #define CH7018_DEVICE_ID_VALUE          0x1a
  71 #define CH7019_DEVICE_ID_VALUE          0x19
  72
  73 #define CH7017_XCLK_D2_ADJUST           0x53
  74 #define CH7017_UP_SCALER_COEFF_0        0x55
  75 #define CH7017_UP_SCALER_COEFF_1        0x56
  76 #define CH7017_UP_SCALER_COEFF_2        0x57
  77 #define CH7017_UP_SCALER_COEFF_3        0x58
  78 #define CH7017_UP_SCALER_COEFF_4        0x59
  79 #define CH7017_UP_SCALER_VERTICAL_INC_0 0x5a
  80 #define CH7017_UP_SCALER_VERTICAL_INC_1 0x5b
  81 #define CH7017_GPIO_INVERT              0x5c
  82 #define CH7017_UP_SCALER_HORIZONTAL_INC_0       0x5d
  83 #define CH7017_UP_SCALER_HORIZONTAL_INC_1       0x5e
  84
  85 #define CH7017_HORIZONTAL_ACTIVE_PIXEL_INPUT    0x5f
  86 /**< Low bits of horizontal active pixel input */
  87
  88 #define CH7017_ACTIVE_INPUT_LINE_OUTPUT 0x60
  89 /** High bits of horizontal active pixel input */
  90 #define CH7017_LVDS_HAP_INPUT_MASK      (0x7 << 0)
  91 /** High bits of vertical active line output */
  92 #define CH7017_LVDS_VAL_HIGH_MASK       (0x7 << 3)
  93
  94 #define CH7017_VERTICAL_ACTIVE_LINE_OUTPUT      0x61
  95 /**< Low bits of vertical active line output */
  96
  97 #define CH7017_HORIZONTAL_ACTIVE_PIXEL_OUTPUT   0x62
  98 /**< Low bits of horizontal active pixel output */
  99
 100 #define CH7017_LVDS_POWER_DOWN          0x63
 101 /** High bits of horizontal active pixel output */
 102 #define CH7017_LVDS_HAP_HIGH_MASK       (0x7 << 0)
 103 /** Enables the LVDS power down state transition */
 104 #define CH7017_LVDS_POWER_DOWN_EN       (1 << 6)
 105 /** Enables the LVDS upscaler */
 106 #define CH7017_LVDS_UPSCALER_EN         (1 << 7)
 107 #define CH7017_LVDS_POWER_DOWN_DEFAULT_RESERVED 0x08
 108
 109 #define CH7017_LVDS_ENCODING            0x64
 110 #define CH7017_LVDS_DITHER_2D           (1 << 2)
 111 #define CH7017_LVDS_DITHER_DIS          (1 << 3)
 112 #define CH7017_LVDS_DUAL_CHANNEL_EN     (1 << 4)
 113 #define CH7017_LVDS_24_BIT              (1 << 5)
 114
 115 #define CH7017_LVDS_ENCODING_2          0x65
 116
 117 #define CH7017_LVDS_PLL_CONTROL         0x66
 118 /** Enables the LVDS panel output path */
 119 #define CH7017_LVDS_PANEN               (1 << 0)
 120 /** Enables the LVDS panel backlight */
 121 #define CH7017_LVDS_BKLEN               (1 << 3)
 122
 123 #define CH7017_POWER_SEQUENCING_T1      0x67
 124 #define CH7017_POWER_SEQUENCING_T2      0x68
 125 #define CH7017_POWER_SEQUENCING_T3      0x69
 126 #define CH7017_POWER_SEQUENCING_T4      0x6a
 127 #define CH7017_POWER_SEQUENCING_T5      0x6b
 128 #define CH7017_GPIO_DRIVER_TYPE         0x6c
 129 #define CH7017_GPIO_DATA                0x6d
 130 #define CH7017_GPIO_DIRECTION_CONTROL   0x6e
 131
 132 #define CH7017_LVDS_PLL_FEEDBACK_DIV    0x71
 133 # define CH7017_LVDS_PLL_FEED_BACK_DIVIDER_SHIFT 4
 134 # define CH7017_LVDS_PLL_FEED_FORWARD_DIVIDER_SHIFT 0
 135 # define CH7017_LVDS_PLL_FEEDBACK_DEFAULT_RESERVED 0x80
 136
 137 #define CH7017_LVDS_PLL_VCO_CONTROL     0x72
 138 # define CH7017_LVDS_PLL_VCO_DEFAULT_RESERVED 0x80
 139 # define CH7017_LVDS_PLL_VCO_SHIFT      4
 140 # define CH7017_LVDS_PLL_POST_SCALE_DIV_SHIFT 0
 141
 142 #define CH7017_OUTPUTS_ENABLE           0x73
 143 # define CH7017_CHARGE_PUMP_LOW         0x0
 144 # define CH7017_CHARGE_PUMP_HIGH        0x3
 145 # define CH7017_LVDS_CHANNEL_A          (1 << 3)
 146 # define CH7017_LVDS_CHANNEL_B          (1 << 4)
 147 # define CH7017_TV_DAC_A                (1 << 5)
 148 # define CH7017_TV_DAC_B                (1 << 6)
 149 # define CH7017_DDC_SELECT_DC2          (1 << 7)
 150
 151 #define CH7017_LVDS_OUTPUT_AMPLITUDE    0x74
 152 #define CH7017_LVDS_PLL_EMI_REDUCTION   0x75
 153 #define CH7017_LVDS_POWER_DOWN_FLICKER  0x76
 154
 155 #define CH7017_LVDS_CONTROL_2           0x78
 156 # define CH7017_LOOP_FILTER_SHIFT       5
 157 # define CH7017_PHASE_DETECTOR_SHIFT    0
 158
 159 #define CH7017_BANG_LIMIT_CONTROL       0x7f
 160
 161 struct ch7017_priv {
 162         uint8_t save_hapi;
 163         uint8_t save_vali;
 164         uint8_t save_valo;
 165         uint8_t save_ailo;
 166         uint8_t save_lvds_pll_vco;
 167         uint8_t save_feedback_div;
 168         uint8_t save_lvds_control_2;
 169         uint8_t save_outputs_enable;
 170         uint8_t save_lvds_power_down;
 171         uint8_t save_power_management;
 172 };
 173
 174 static void ch7017_dump_regs(struct intel_dvo_device *dvo);
 175 static void ch7017_dpms(struct intel_dvo_device *dvo, int mode);
 176
 177 static bool ch7017_read(struct intel_dvo_device *dvo, int addr, uint8_t *val)
 178 {
 179         struct i2c_adapter *adapter = dvo->i2c_bus;
 180         struct intel_i2c_chan *i2cbus = container_of(adapter, struct intel_i2c_chan, adapter);
 181         u8 out_buf[2];
 182         u8 in_buf[2];
 183
 184         struct i2c_msg msgs[] = {
 185                 {
 186                         .addr = dvo->slave_addr,
 187                         .flags = 0,
 188                         .len = 1,
 189                         .buf = out_buf,
 190                 },
 191                 {
 192                         .addr = dvo->slave_addr,
 193                         .flags = I2C_M_RD,
 194                         .len = 1,
 195                         .buf = in_buf,
 196                 }
 197         };
 198
 199         out_buf[0] = addr;
 200         out_buf[1] = 0;
 201
 202         if (i2c_transfer(&i2cbus->adapter, msgs, 2) == 2) {
 203                 *val= in_buf[0];
 204                 return true;
 205         };
 206
 207         return false;
 208 }
 209
 210 static bool ch7017_write(struct intel_dvo_device *dvo, int addr, uint8_t val)
 211 {
 212         struct i2c_adapter *adapter = dvo->i2c_bus;
 213         struct intel_i2c_chan *i2cbus = container_of(adapter, struct intel_i2c_chan, adapter);
 214         uint8_t out_buf[2];
 215         struct i2c_msg msg = {
 216                 .addr = dvo->slave_addr,
 217                 .flags = 0,
 218                 .len = 2,
 219                 .buf = out_buf,
 220         };
 221
 222         out_buf[0] = addr;
 223         out_buf[1] = val;
 224
 225         if (i2c_transfer(&i2cbus->adapter, &msg, 1) == 1)
 226                 return true;
 227
 228         return false;
 229 }
 230
 231 /** Probes for a CH7017 on the given bus and slave address. */
 232 static bool ch7017_init(struct intel_dvo_device *dvo,
 233                         struct i2c_adapter *adapter)
 234 {
 235         struct intel_i2c_chan *i2cbus = container_of(adapter, struct intel_i2c_chan, adapter);
 236         struct ch7017_priv *priv;
 237         uint8_t val;
 238
 239         priv = kzalloc(sizeof(struct ch7017_priv), GFP_KERNEL);
 240         if (priv == NULL)
 241                 return false;
 242
 243         dvo->i2c_bus = adapter;
 244         dvo->dev_priv = priv;
 245
 246         if (!ch7017_read(dvo, CH7017_DEVICE_ID, &val))
 247                 goto fail;
 248
 249         if (val != CH7017_DEVICE_ID_VALUE &&
 250             val != CH7018_DEVICE_ID_VALUE &&
 251             val != CH7019_DEVICE_ID_VALUE) {
 252                 DRM_DEBUG("ch701x not detected, got %d: from %s Slave %d.\n",
 253                           val, i2cbus->adapter.name,dvo->slave_addr);
 254                 goto fail;
 255         }
 256
 257         return true;
 258 fail:
 259         kfree(priv);
 260         return false;
 261 }
 262
 263 static enum drm_connector_status ch7017_detect(struct intel_dvo_device *dvo)
 264 {
 265         return connector_status_unknown;
 266 }
 267
 268 static enum drm_mode_status ch7017_mode_valid(struct intel_dvo_device *dvo,
 269                                               struct drm_display_mode *mode)
 270 {
 271         if (mode->clock > 160000)
 272                 return MODE_CLOCK_HIGH;
 273
 274         return MODE_OK;
 275 }
 276
 277 static void ch7017_mode_set(struct intel_dvo_device *dvo,
 278                             struct drm_display_mode *mode,
 279                             struct drm_display_mode *adjusted_mode)
 280 {
 281         uint8_t lvds_pll_feedback_div, lvds_pll_vco_control;
 282         uint8_t outputs_enable, lvds_control_2, lvds_power_down;
 283         uint8_t horizontal_active_pixel_input;
 284         uint8_t horizontal_active_pixel_output, vertical_active_line_output;
 285         uint8_t active_input_line_output;
 286
 287         DRM_DEBUG("Registers before mode setting\n");
 288         ch7017_dump_regs(dvo);
 289
 290         /* LVDS PLL settings from page 75 of 7017-7017ds.pdf*/
 291         if (mode->clock < 100000) {
 292                 outputs_enable = CH7017_LVDS_CHANNEL_A | CH7017_CHARGE_PUMP_LOW;
 293                 lvds_pll_feedback_div = CH7017_LVDS_PLL_FEEDBACK_DEFAULT_RESERVED |
 294                         (2 << CH7017_LVDS_PLL_FEED_BACK_DIVIDER_SHIFT) |
 295                         (13 << CH7017_LVDS_PLL_FEED_FORWARD_DIVIDER_SHIFT);
 296                 lvds_pll_vco_control = CH7017_LVDS_PLL_VCO_DEFAULT_RESERVED |
 297                         (2 << CH7017_LVDS_PLL_VCO_SHIFT) |
 298                         (3 << CH7017_LVDS_PLL_POST_SCALE_DIV_SHIFT);
 299                 lvds_control_2 = (1 << CH7017_LOOP_FILTER_SHIFT) |
 300                         (0 << CH7017_PHASE_DETECTOR_SHIFT);
 301         } else {
 302                 outputs_enable = CH7017_LVDS_CHANNEL_A | CH7017_CHARGE_PUMP_HIGH;
 303                 lvds_pll_feedback_div = CH7017_LVDS_PLL_FEEDBACK_DEFAULT_RESERVED |
 304                         (2 << CH7017_LVDS_PLL_FEED_BACK_DIVIDER_SHIFT) |
 305                         (3 << CH7017_LVDS_PLL_FEED_FORWARD_DIVIDER_SHIFT);
 306                 lvds_pll_feedback_div = 35;
 307                 lvds_control_2 = (3 << CH7017_LOOP_FILTER_SHIFT) |
 308                         (0 << CH7017_PHASE_DETECTOR_SHIFT);
 309                 if (1) { /* XXX: dual channel panel detection.  Assume yes for now. */
 310                         outputs_enable |= CH7017_LVDS_CHANNEL_B;
 311                         lvds_pll_vco_control = CH7017_LVDS_PLL_VCO_DEFAULT_RESERVED |
 312                                 (2 << CH7017_LVDS_PLL_VCO_SHIFT) |
 313                                 (13 << CH7017_LVDS_PLL_POST_SCALE_DIV_SHIFT);
 314                 } else {
 315                         lvds_pll_vco_control = CH7017_LVDS_PLL_VCO_DEFAULT_RESERVED |
 316                                 (1 << CH7017_LVDS_PLL_VCO_SHIFT) |
 317                                 (13 << CH7017_LVDS_PLL_POST_SCALE_DIV_SHIFT);
 318                 }
 319         }
 320
 321         horizontal_active_pixel_input = mode->hdisplay & 0x00ff;
 322
 323         vertical_active_line_output = mode->vdisplay & 0x00ff;
 324         horizontal_active_pixel_output = mode->hdisplay & 0x00ff;
 325
 326         active_input_line_output = ((mode->hdisplay & 0x0700) >> 8) |
 327                                    (((mode->vdisplay & 0x0700) >> 8) << 3);
 328
 329         lvds_power_down = CH7017_LVDS_POWER_DOWN_DEFAULT_RESERVED |
 330                           (mode->hdisplay & 0x0700) >> 8;
 331
 332         ch7017_dpms(dvo, DRM_MODE_DPMS_OFF);
 333         ch7017_write(dvo, CH7017_HORIZONTAL_ACTIVE_PIXEL_INPUT,
 334                         horizontal_active_pixel_input);
 335         ch7017_write(dvo, CH7017_HORIZONTAL_ACTIVE_PIXEL_OUTPUT,
 336                         horizontal_active_pixel_output);
 337         ch7017_write(dvo, CH7017_VERTICAL_ACTIVE_LINE_OUTPUT,
 338                         vertical_active_line_output);
 339         ch7017_write(dvo, CH7017_ACTIVE_INPUT_LINE_OUTPUT,
 340                         active_input_line_output);
 341         ch7017_write(dvo, CH7017_LVDS_PLL_VCO_CONTROL, lvds_pll_vco_control);
 342         ch7017_write(dvo, CH7017_LVDS_PLL_FEEDBACK_DIV, lvds_pll_feedback_div);
 343         ch7017_write(dvo, CH7017_LVDS_CONTROL_2, lvds_control_2);
 344         ch7017_write(dvo, CH7017_OUTPUTS_ENABLE, outputs_enable);
 345
 346         /* Turn the LVDS back on with new settings. */
 347         ch7017_write(dvo, CH7017_LVDS_POWER_DOWN, lvds_power_down);
 348
 349         DRM_DEBUG("Registers after mode setting\n");
 350         ch7017_dump_regs(dvo);
 351 }
 352
 353 /* set the CH7017 power state */
 354 static void ch7017_dpms(struct intel_dvo_device *dvo, int mode)
 355 {
 356         uint8_t val;
 357
 358         ch7017_read(dvo, CH7017_LVDS_POWER_DOWN, &val);
 359
 360         /* Turn off TV/VGA, and never turn it on since we don't support it. */
 361         ch7017_write(dvo, CH7017_POWER_MANAGEMENT,
 362                         CH7017_DAC0_POWER_DOWN |
 363                         CH7017_DAC1_POWER_DOWN |
 364                         CH7017_DAC2_POWER_DOWN |
 365                         CH7017_DAC3_POWER_DOWN |
 366                         CH7017_TV_POWER_DOWN_EN);
 367
 368         if (mode == DRM_MODE_DPMS_ON) {
 369                 /* Turn on the LVDS */
 370                 ch7017_write(dvo, CH7017_LVDS_POWER_DOWN,
 371                              val & ~CH7017_LVDS_POWER_DOWN_EN);
 372         } else {
 373                 /* Turn off the LVDS */
 374                 ch7017_write(dvo, CH7017_LVDS_POWER_DOWN,
 375                              val | CH7017_LVDS_POWER_DOWN_EN);
 376         }
 377
 378         /* XXX: Should actually wait for update power status somehow */
 379         udelay(20000);
 380 }
 381
 382 static void ch7017_dump_regs(struct intel_dvo_device *dvo)
 383 {
 384         uint8_t val;
 385
 386 #define DUMP(reg)                                       \
 387 do {                                                    \
 388         ch7017_read(dvo, reg, &val);                    \
 389         DRM_DEBUG(#reg ": %02x\n", val);                \
 390 } while (0)
 391
 392         DUMP(CH7017_HORIZONTAL_ACTIVE_PIXEL_INPUT);
 393         DUMP(CH7017_HORIZONTAL_ACTIVE_PIXEL_OUTPUT);
 394         DUMP(CH7017_VERTICAL_ACTIVE_LINE_OUTPUT);
 395         DUMP(CH7017_ACTIVE_INPUT_LINE_OUTPUT);
 396         DUMP(CH7017_LVDS_PLL_VCO_CONTROL);
 397         DUMP(CH7017_LVDS_PLL_FEEDBACK_DIV);
 398         DUMP(CH7017_LVDS_CONTROL_2);
 399         DUMP(CH7017_OUTPUTS_ENABLE);
 400         DUMP(CH7017_LVDS_POWER_DOWN);
 401 }
 402
 403 static void ch7017_save(struct intel_dvo_device *dvo)
 404 {
 405         struct ch7017_priv *priv = dvo->dev_priv;
 406
 407         ch7017_read(dvo, CH7017_HORIZONTAL_ACTIVE_PIXEL_INPUT, &priv->save_hapi);
 408         ch7017_read(dvo, CH7017_VERTICAL_ACTIVE_LINE_OUTPUT, &priv->save_valo);
 409         ch7017_read(dvo, CH7017_ACTIVE_INPUT_LINE_OUTPUT, &priv->save_ailo);
 410         ch7017_read(dvo, CH7017_LVDS_PLL_VCO_CONTROL, &priv->save_lvds_pll_vco);
 411         ch7017_read(dvo, CH7017_LVDS_PLL_FEEDBACK_DIV, &priv->save_feedback_div);
 412         ch7017_read(dvo, CH7017_LVDS_CONTROL_2, &priv->save_lvds_control_2);
 413         ch7017_read(dvo, CH7017_OUTPUTS_ENABLE, &priv->save_outputs_enable);
 414         ch7017_read(dvo, CH7017_LVDS_POWER_DOWN, &priv->save_lvds_power_down);
 415         ch7017_read(dvo, CH7017_POWER_MANAGEMENT, &priv->save_power_management);
 416 }
 417
 418 static void ch7017_restore(struct intel_dvo_device *dvo)
 419 {
 420         struct ch7017_priv *priv = dvo->dev_priv;
 421
 422         /* Power down before changing mode */
 423         ch7017_dpms(dvo, DRM_MODE_DPMS_OFF);
 424
 425         ch7017_write(dvo, CH7017_HORIZONTAL_ACTIVE_PIXEL_INPUT, priv->save_hapi);
 426         ch7017_write(dvo, CH7017_VERTICAL_ACTIVE_LINE_OUTPUT, priv->save_valo);
 427         ch7017_write(dvo, CH7017_ACTIVE_INPUT_LINE_OUTPUT, priv->save_ailo);
 428         ch7017_write(dvo, CH7017_LVDS_PLL_VCO_CONTROL, priv->save_lvds_pll_vco);
 429         ch7017_write(dvo, CH7017_LVDS_PLL_FEEDBACK_DIV, priv->save_feedback_div);
 430         ch7017_write(dvo, CH7017_LVDS_CONTROL_2, priv->save_lvds_control_2);
 431         ch7017_write(dvo, CH7017_OUTPUTS_ENABLE, priv->save_outputs_enable);
 432         ch7017_write(dvo, CH7017_LVDS_POWER_DOWN, priv->save_lvds_power_down);
 433         ch7017_write(dvo, CH7017_POWER_MANAGEMENT, priv->save_power_management);
 434 }
 435
 436 static void ch7017_destroy(struct intel_dvo_device *dvo)
 437 {
 438         struct ch7017_priv *priv = dvo->dev_priv;
 439
 440         if (priv) {
 441                 kfree(priv);
 442                 dvo->dev_priv = NULL;
 443         }
 444 }
 445
 446 struct intel_dvo_dev_ops ch7017_ops = {
 447         .init = ch7017_init,
 448         .detect = ch7017_detect,
 449         .mode_valid = ch7017_mode_valid,
 450         .mode_set = ch7017_mode_set,
 451         .dpms = ch7017_dpms,
 452         .dump_regs = ch7017_dump_regs,
 453         .save = ch7017_save,
 454         .restore = ch7017_restore,
 455         .destroy = ch7017_destroy,
 456 };