drivers/gpu/drm/i915/dvo_tfp410.c

   1 /*
   2  * Copyright © 2007 Dave Mueller
   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 DEALINGS
  21  * IN THE SOFTWARE.
  22  *
  23  * Authors:
  24  *    Dave Mueller <dave.mueller@gmx.ch>
  25  *
  26  */
  27
  28 #include "dvo.h"
  29
  30 /* register definitions according to the TFP410 data sheet */
  31 #define TFP410_VID              0x014C
  32 #define TFP410_DID              0x0410
  33
  34 #define TFP410_VID_LO           0x00
  35 #define TFP410_VID_HI           0x01
  36 #define TFP410_DID_LO           0x02
  37 #define TFP410_DID_HI           0x03
  38 #define TFP410_REV              0x04
  39
  40 #define TFP410_CTL_1            0x08
  41 #define TFP410_CTL_1_TDIS       (1<<6)
  42 #define TFP410_CTL_1_VEN        (1<<5)
  43 #define TFP410_CTL_1_HEN        (1<<4)
  44 #define TFP410_CTL_1_DSEL       (1<<3)
  45 #define TFP410_CTL_1_BSEL       (1<<2)
  46 #define TFP410_CTL_1_EDGE       (1<<1)
  47 #define TFP410_CTL_1_PD         (1<<0)
  48
  49 #define TFP410_CTL_2            0x09
  50 #define TFP410_CTL_2_VLOW       (1<<7)
  51 #define TFP410_CTL_2_MSEL_MASK  (0x7<<4)
  52 #define TFP410_CTL_2_MSEL       (1<<4)
  53 #define TFP410_CTL_2_TSEL       (1<<3)
  54 #define TFP410_CTL_2_RSEN       (1<<2)
  55 #define TFP410_CTL_2_HTPLG      (1<<1)
  56 #define TFP410_CTL_2_MDI        (1<<0)
  57
  58 #define TFP410_CTL_3            0x0A
  59 #define TFP410_CTL_3_DK_MASK    (0x7<<5)
  60 #define TFP410_CTL_3_DK         (1<<5)
  61 #define TFP410_CTL_3_DKEN       (1<<4)
  62 #define TFP410_CTL_3_CTL_MASK   (0x7<<1)
  63 #define TFP410_CTL_3_CTL        (1<<1)
  64
  65 #define TFP410_USERCFG          0x0B
  66
  67 #define TFP410_DE_DLY           0x32
  68
  69 #define TFP410_DE_CTL           0x33
  70 #define TFP410_DE_CTL_DEGEN     (1<<6)
  71 #define TFP410_DE_CTL_VSPOL     (1<<5)
  72 #define TFP410_DE_CTL_HSPOL     (1<<4)
  73 #define TFP410_DE_CTL_DEDLY8    (1<<0)
  74
  75 #define TFP410_DE_TOP           0x34
  76
  77 #define TFP410_DE_CNT_LO        0x36
  78 #define TFP410_DE_CNT_HI        0x37
  79
  80 #define TFP410_DE_LIN_LO        0x38
  81 #define TFP410_DE_LIN_HI        0x39
  82
  83 #define TFP410_H_RES_LO         0x3A
  84 #define TFP410_H_RES_HI         0x3B
  85
  86 #define TFP410_V_RES_LO         0x3C
  87 #define TFP410_V_RES_HI         0x3D
  88
  89 struct tfp410_save_rec {
  90         uint8_t ctl1;
  91         uint8_t ctl2;
  92 };
  93
  94 struct tfp410_priv {
  95         bool quiet;
  96
  97         struct tfp410_save_rec saved_reg;
  98         struct tfp410_save_rec mode_reg;
  99 };
 100
 101 static bool tfp410_readb(struct intel_dvo_device *dvo, int addr, uint8_t *ch)
 102 {
 103         struct tfp410_priv *tfp = dvo->dev_priv;
 104         struct i2c_adapter *adapter = dvo->i2c_bus;
 105         struct intel_i2c_chan *i2cbus = container_of(adapter, struct intel_i2c_chan, adapter);
 106         u8 out_buf[2];
 107         u8 in_buf[2];
 108
 109         struct i2c_msg msgs[] = {
 110                 {
 111                         .addr = dvo->slave_addr,
 112                         .flags = 0,
 113                         .len = 1,
 114                         .buf = out_buf,
 115                 },
 116                 {
 117                         .addr = dvo->slave_addr,
 118                         .flags = I2C_M_RD,
 119                         .len = 1,
 120                         .buf = in_buf,
 121                 }
 122         };
 123
 124         out_buf[0] = addr;
 125         out_buf[1] = 0;
 126
 127         if (i2c_transfer(&i2cbus->adapter, msgs, 2) == 2) {
 128                 *ch = in_buf[0];
 129                 return true;
 130         };
 131
 132         if (!tfp->quiet) {
 133                 DRM_DEBUG("Unable to read register 0x%02x from %s:%02x.\n",
 134                           addr, i2cbus->adapter.name, dvo->slave_addr);
 135         }
 136         return false;
 137 }
 138
 139 static bool tfp410_writeb(struct intel_dvo_device *dvo, int addr, uint8_t ch)
 140 {
 141         struct tfp410_priv *tfp = dvo->dev_priv;
 142         struct i2c_adapter *adapter = dvo->i2c_bus;
 143         struct intel_i2c_chan *i2cbus = container_of(adapter, struct intel_i2c_chan, adapter);
 144         uint8_t out_buf[2];
 145         struct i2c_msg msg = {
 146                 .addr = dvo->slave_addr,
 147                 .flags = 0,
 148                 .len = 2,
 149                 .buf = out_buf,
 150         };
 151
 152         out_buf[0] = addr;
 153         out_buf[1] = ch;
 154
 155         if (i2c_transfer(&i2cbus->adapter, &msg, 1) == 1)
 156                 return true;
 157
 158         if (!tfp->quiet) {
 159                 DRM_DEBUG("Unable to write register 0x%02x to %s:%d.\n",
 160                           addr, i2cbus->adapter.name, dvo->slave_addr);
 161         }
 162
 163         return false;
 164 }
 165
 166 static int tfp410_getid(struct intel_dvo_device *dvo, int addr)
 167 {
 168         uint8_t ch1, ch2;
 169
 170         if (tfp410_readb(dvo, addr+0, &ch1) &&
 171             tfp410_readb(dvo, addr+1, &ch2))
 172                 return ((ch2 << 8) & 0xFF00) | (ch1 & 0x00FF);
 173
 174         return -1;
 175 }
 176
 177 /* Ti TFP410 driver for chip on i2c bus */
 178 static bool tfp410_init(struct intel_dvo_device *dvo,
 179                         struct i2c_adapter *adapter)
 180 {
 181         /* this will detect the tfp410 chip on the specified i2c bus */
 182         struct tfp410_priv *tfp;
 183         int id;
 184
 185         tfp = kzalloc(sizeof(struct tfp410_priv), GFP_KERNEL);
 186         if (tfp == NULL)
 187                 return false;
 188
 189         dvo->i2c_bus = adapter;
 190         dvo->dev_priv = tfp;
 191         tfp->quiet = true;
 192
 193         if ((id = tfp410_getid(dvo, TFP410_VID_LO)) != TFP410_VID) {
 194                 DRM_DEBUG("tfp410 not detected got VID %X: from %s Slave %d.\n",
 195                           id, adapter->name, dvo->slave_addr);
 196                 goto out;
 197         }
 198
 199         if ((id = tfp410_getid(dvo, TFP410_DID_LO)) != TFP410_DID) {
 200                 DRM_DEBUG("tfp410 not detected got DID %X: from %s Slave %d.\n",
 201                           id, adapter->name, dvo->slave_addr);
 202                 goto out;
 203         }
 204         tfp->quiet = false;
 205         return true;
 206 out:
 207         kfree(tfp);
 208         return false;
 209 }
 210
 211 static enum drm_connector_status tfp410_detect(struct intel_dvo_device *dvo)
 212 {
 213         enum drm_connector_status ret = connector_status_disconnected;
 214         uint8_t ctl2;
 215
 216         if (tfp410_readb(dvo, TFP410_CTL_2, &ctl2)) {
 217                 if (ctl2 & TFP410_CTL_2_HTPLG)
 218                         ret = connector_status_connected;
 219                 else
 220                         ret = connector_status_disconnected;
 221         }
 222
 223         return ret;
 224 }
 225
 226 static enum drm_mode_status tfp410_mode_valid(struct intel_dvo_device *dvo,
 227                                               struct drm_display_mode *mode)
 228 {
 229         return MODE_OK;
 230 }
 231
 232 static void tfp410_mode_set(struct intel_dvo_device *dvo,
 233                             struct drm_display_mode *mode,
 234                             struct drm_display_mode *adjusted_mode)
 235 {
 236     /* As long as the basics are set up, since we don't have clock dependencies
 237      * in the mode setup, we can just leave the registers alone and everything
 238      * will work fine.
 239      */
 240     /* don't do much */
 241     return;
 242 }
 243
 244 /* set the tfp410 power state */
 245 static void tfp410_dpms(struct intel_dvo_device *dvo, int mode)
 246 {
 247         uint8_t ctl1;
 248
 249         if (!tfp410_readb(dvo, TFP410_CTL_1, &ctl1))
 250                 return;
 251
 252         if (mode == DRM_MODE_DPMS_ON)
 253                 ctl1 |= TFP410_CTL_1_PD;
 254         else
 255                 ctl1 &= ~TFP410_CTL_1_PD;
 256
 257         tfp410_writeb(dvo, TFP410_CTL_1, ctl1);
 258 }
 259
 260 static void tfp410_dump_regs(struct intel_dvo_device *dvo)
 261 {
 262         uint8_t val, val2;
 263
 264         tfp410_readb(dvo, TFP410_REV, &val);
 265         DRM_DEBUG("TFP410_REV: 0x%02X\n", val);
 266         tfp410_readb(dvo, TFP410_CTL_1, &val);
 267         DRM_DEBUG("TFP410_CTL1: 0x%02X\n", val);
 268         tfp410_readb(dvo, TFP410_CTL_2, &val);
 269         DRM_DEBUG("TFP410_CTL2: 0x%02X\n", val);
 270         tfp410_readb(dvo, TFP410_CTL_3, &val);
 271         DRM_DEBUG("TFP410_CTL3: 0x%02X\n", val);
 272         tfp410_readb(dvo, TFP410_USERCFG, &val);
 273         DRM_DEBUG("TFP410_USERCFG: 0x%02X\n", val);
 274         tfp410_readb(dvo, TFP410_DE_DLY, &val);
 275         DRM_DEBUG("TFP410_DE_DLY: 0x%02X\n", val);
 276         tfp410_readb(dvo, TFP410_DE_CTL, &val);
 277         DRM_DEBUG("TFP410_DE_CTL: 0x%02X\n", val);
 278         tfp410_readb(dvo, TFP410_DE_TOP, &val);
 279         DRM_DEBUG("TFP410_DE_TOP: 0x%02X\n", val);
 280         tfp410_readb(dvo, TFP410_DE_CNT_LO, &val);
 281         tfp410_readb(dvo, TFP410_DE_CNT_HI, &val2);
 282         DRM_DEBUG("TFP410_DE_CNT: 0x%02X%02X\n", val2, val);
 283         tfp410_readb(dvo, TFP410_DE_LIN_LO, &val);
 284         tfp410_readb(dvo, TFP410_DE_LIN_HI, &val2);
 285         DRM_DEBUG("TFP410_DE_LIN: 0x%02X%02X\n", val2, val);
 286         tfp410_readb(dvo, TFP410_H_RES_LO, &val);
 287         tfp410_readb(dvo, TFP410_H_RES_HI, &val2);
 288         DRM_DEBUG("TFP410_H_RES: 0x%02X%02X\n", val2, val);
 289         tfp410_readb(dvo, TFP410_V_RES_LO, &val);
 290         tfp410_readb(dvo, TFP410_V_RES_HI, &val2);
 291         DRM_DEBUG("TFP410_V_RES: 0x%02X%02X\n", val2, val);
 292 }
 293
 294 static void tfp410_save(struct intel_dvo_device *dvo)
 295 {
 296         struct tfp410_priv *tfp = dvo->dev_priv;
 297
 298         if (!tfp410_readb(dvo, TFP410_CTL_1, &tfp->saved_reg.ctl1))
 299                 return;
 300
 301         if (!tfp410_readb(dvo, TFP410_CTL_2, &tfp->saved_reg.ctl2))
 302                 return;
 303 }
 304
 305 static void tfp410_restore(struct intel_dvo_device *dvo)
 306 {
 307         struct tfp410_priv *tfp = dvo->dev_priv;
 308
 309         /* Restore it powered down initially */
 310         tfp410_writeb(dvo, TFP410_CTL_1, tfp->saved_reg.ctl1 & ~0x1);
 311
 312         tfp410_writeb(dvo, TFP410_CTL_2, tfp->saved_reg.ctl2);
 313         tfp410_writeb(dvo, TFP410_CTL_1, tfp->saved_reg.ctl1);
 314 }
 315
 316 static void tfp410_destroy(struct intel_dvo_device *dvo)
 317 {
 318         struct tfp410_priv *tfp = dvo->dev_priv;
 319
 320         if (tfp) {
 321                 kfree(tfp);
 322                 dvo->dev_priv = NULL;
 323         }
 324 }
 325
 326 struct intel_dvo_dev_ops tfp410_ops = {
 327         .init = tfp410_init,
 328         .detect = tfp410_detect,
 329         .mode_valid = tfp410_mode_valid,
 330         .mode_set = tfp410_mode_set,
 331         .dpms = tfp410_dpms,
 332         .dump_regs = tfp410_dump_regs,
 333         .save = tfp410_save,
 334         .restore = tfp410_restore,
 335         .destroy = tfp410_destroy,
 336 };