drivers/gpu/drm/i915/display/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 "intel_display_types.h"
  29 #include "intel_dvo_dev.h"
  30
  31 /* register definitions according to the TFP410 data sheet */
  32 #define TFP410_VID              0x014C
  33 #define TFP410_DID              0x0410
  34
  35 #define TFP410_VID_LO           0x00
  36 #define TFP410_VID_HI           0x01
  37 #define TFP410_DID_LO           0x02
  38 #define TFP410_DID_HI           0x03
  39 #define TFP410_REV              0x04
  40
  41 #define TFP410_CTL_1            0x08
  42 #define TFP410_CTL_1_TDIS       (1<<6)
  43 #define TFP410_CTL_1_VEN        (1<<5)
  44 #define TFP410_CTL_1_HEN        (1<<4)
  45 #define TFP410_CTL_1_DSEL       (1<<3)
  46 #define TFP410_CTL_1_BSEL       (1<<2)
  47 #define TFP410_CTL_1_EDGE       (1<<1)
  48 #define TFP410_CTL_1_PD         (1<<0)
  49
  50 #define TFP410_CTL_2            0x09
  51 #define TFP410_CTL_2_VLOW       (1<<7)
  52 #define TFP410_CTL_2_MSEL_MASK  (0x7<<4)
  53 #define TFP410_CTL_2_MSEL       (1<<4)
  54 #define TFP410_CTL_2_TSEL       (1<<3)
  55 #define TFP410_CTL_2_RSEN       (1<<2)
  56 #define TFP410_CTL_2_HTPLG      (1<<1)
  57 #define TFP410_CTL_2_MDI        (1<<0)
  58
  59 #define TFP410_CTL_3            0x0A
  60 #define TFP410_CTL_3_DK_MASK    (0x7<<5)
  61 #define TFP410_CTL_3_DK         (1<<5)
  62 #define TFP410_CTL_3_DKEN       (1<<4)
  63 #define TFP410_CTL_3_CTL_MASK   (0x7<<1)
  64 #define TFP410_CTL_3_CTL        (1<<1)
  65
  66 #define TFP410_USERCFG          0x0B
  67
  68 #define TFP410_DE_DLY           0x32
  69
  70 #define TFP410_DE_CTL           0x33
  71 #define TFP410_DE_CTL_DEGEN     (1<<6)
  72 #define TFP410_DE_CTL_VSPOL     (1<<5)
  73 #define TFP410_DE_CTL_HSPOL     (1<<4)
  74 #define TFP410_DE_CTL_DEDLY8    (1<<0)
  75
  76 #define TFP410_DE_TOP           0x34
  77
  78 #define TFP410_DE_CNT_LO        0x36
  79 #define TFP410_DE_CNT_HI        0x37
  80
  81 #define TFP410_DE_LIN_LO        0x38
  82 #define TFP410_DE_LIN_HI        0x39
  83
  84 #define TFP410_H_RES_LO         0x3A
  85 #define TFP410_H_RES_HI         0x3B
  86
  87 #define TFP410_V_RES_LO         0x3C
  88 #define TFP410_V_RES_HI         0x3D
  89
  90 struct tfp410_priv {
  91         bool quiet;
  92 };
  93
  94 static bool tfp410_readb(struct intel_dvo_device *dvo, int addr, u8 *ch)
  95 {
  96         struct tfp410_priv *tfp = dvo->dev_priv;
  97         struct i2c_adapter *adapter = dvo->i2c_bus;
  98         u8 out_buf[2];
  99         u8 in_buf[2];
 100
 101         struct i2c_msg msgs[] = {
 102                 {
 103                         .addr = dvo->slave_addr,
 104                         .flags = 0,
 105                         .len = 1,
 106                         .buf = out_buf,
 107                 },
 108                 {
 109                         .addr = dvo->slave_addr,
 110                         .flags = I2C_M_RD,
 111                         .len = 1,
 112                         .buf = in_buf,
 113                 }
 114         };
 115
 116         out_buf[0] = addr;
 117         out_buf[1] = 0;
 118
 119         if (i2c_transfer(adapter, msgs, 2) == 2) {
 120                 *ch = in_buf[0];
 121                 return true;
 122         }
 123
 124         if (!tfp->quiet) {
 125                 DRM_DEBUG_KMS("Unable to read register 0x%02x from %s:%02x.\n",
 126                           addr, adapter->name, dvo->slave_addr);
 127         }
 128         return false;
 129 }
 130
 131 static bool tfp410_writeb(struct intel_dvo_device *dvo, int addr, u8 ch)
 132 {
 133         struct tfp410_priv *tfp = dvo->dev_priv;
 134         struct i2c_adapter *adapter = dvo->i2c_bus;
 135         u8 out_buf[2];
 136         struct i2c_msg msg = {
 137                 .addr = dvo->slave_addr,
 138                 .flags = 0,
 139                 .len = 2,
 140                 .buf = out_buf,
 141         };
 142
 143         out_buf[0] = addr;
 144         out_buf[1] = ch;
 145
 146         if (i2c_transfer(adapter, &msg, 1) == 1)
 147                 return true;
 148
 149         if (!tfp->quiet) {
 150                 DRM_DEBUG_KMS("Unable to write register 0x%02x to %s:%d.\n",
 151                           addr, adapter->name, dvo->slave_addr);
 152         }
 153
 154         return false;
 155 }
 156
 157 static int tfp410_getid(struct intel_dvo_device *dvo, int addr)
 158 {
 159         u8 ch1, ch2;
 160
 161         if (tfp410_readb(dvo, addr+0, &ch1) &&
 162             tfp410_readb(dvo, addr+1, &ch2))
 163                 return ((ch2 << 8) & 0xFF00) | (ch1 & 0x00FF);
 164
 165         return -1;
 166 }
 167
 168 /* Ti TFP410 driver for chip on i2c bus */
 169 static bool tfp410_init(struct intel_dvo_device *dvo,
 170                         struct i2c_adapter *adapter)
 171 {
 172         /* this will detect the tfp410 chip on the specified i2c bus */
 173         struct tfp410_priv *tfp;
 174         int id;
 175
 176         tfp = kzalloc(sizeof(struct tfp410_priv), GFP_KERNEL);
 177         if (tfp == NULL)
 178                 return false;
 179
 180         dvo->i2c_bus = adapter;
 181         dvo->dev_priv = tfp;
 182         tfp->quiet = true;
 183
 184         if ((id = tfp410_getid(dvo, TFP410_VID_LO)) != TFP410_VID) {
 185                 DRM_DEBUG_KMS("tfp410 not detected got VID %X: from %s "
 186                                 "Slave %d.\n",
 187                           id, adapter->name, dvo->slave_addr);
 188                 goto out;
 189         }
 190
 191         if ((id = tfp410_getid(dvo, TFP410_DID_LO)) != TFP410_DID) {
 192                 DRM_DEBUG_KMS("tfp410 not detected got DID %X: from %s "
 193                                 "Slave %d.\n",
 194                           id, adapter->name, dvo->slave_addr);
 195                 goto out;
 196         }
 197         tfp->quiet = false;
 198         return true;
 199 out:
 200         kfree(tfp);
 201         return false;
 202 }
 203
 204 static enum drm_connector_status tfp410_detect(struct intel_dvo_device *dvo)
 205 {
 206         enum drm_connector_status ret = connector_status_disconnected;
 207         u8 ctl2;
 208
 209         if (tfp410_readb(dvo, TFP410_CTL_2, &ctl2)) {
 210                 if (ctl2 & TFP410_CTL_2_RSEN)
 211                         ret = connector_status_connected;
 212                 else
 213                         ret = connector_status_disconnected;
 214         }
 215
 216         return ret;
 217 }
 218
 219 static enum drm_mode_status tfp410_mode_valid(struct intel_dvo_device *dvo,
 220                                               struct drm_display_mode *mode)
 221 {
 222         return MODE_OK;
 223 }
 224
 225 static void tfp410_mode_set(struct intel_dvo_device *dvo,
 226                             const struct drm_display_mode *mode,
 227                             const struct drm_display_mode *adjusted_mode)
 228 {
 229         /* As long as the basics are set up, since we don't have clock dependencies
 230         * in the mode setup, we can just leave the registers alone and everything
 231         * will work fine.
 232         */
 233         /* don't do much */
 234         return;
 235 }
 236
 237 /* set the tfp410 power state */
 238 static void tfp410_dpms(struct intel_dvo_device *dvo, bool enable)
 239 {
 240         u8 ctl1;
 241
 242         if (!tfp410_readb(dvo, TFP410_CTL_1, &ctl1))
 243                 return;
 244
 245         if (enable)
 246                 ctl1 |= TFP410_CTL_1_PD;
 247         else
 248                 ctl1 &= ~TFP410_CTL_1_PD;
 249
 250         tfp410_writeb(dvo, TFP410_CTL_1, ctl1);
 251 }
 252
 253 static bool tfp410_get_hw_state(struct intel_dvo_device *dvo)
 254 {
 255         u8 ctl1;
 256
 257         if (!tfp410_readb(dvo, TFP410_CTL_1, &ctl1))
 258                 return false;
 259
 260         if (ctl1 & TFP410_CTL_1_PD)
 261                 return true;
 262         else
 263                 return false;
 264 }
 265
 266 static void tfp410_dump_regs(struct intel_dvo_device *dvo)
 267 {
 268         u8 val, val2;
 269
 270         tfp410_readb(dvo, TFP410_REV, &val);
 271         DRM_DEBUG_KMS("TFP410_REV: 0x%02X\n", val);
 272         tfp410_readb(dvo, TFP410_CTL_1, &val);
 273         DRM_DEBUG_KMS("TFP410_CTL1: 0x%02X\n", val);
 274         tfp410_readb(dvo, TFP410_CTL_2, &val);
 275         DRM_DEBUG_KMS("TFP410_CTL2: 0x%02X\n", val);
 276         tfp410_readb(dvo, TFP410_CTL_3, &val);
 277         DRM_DEBUG_KMS("TFP410_CTL3: 0x%02X\n", val);
 278         tfp410_readb(dvo, TFP410_USERCFG, &val);
 279         DRM_DEBUG_KMS("TFP410_USERCFG: 0x%02X\n", val);
 280         tfp410_readb(dvo, TFP410_DE_DLY, &val);
 281         DRM_DEBUG_KMS("TFP410_DE_DLY: 0x%02X\n", val);
 282         tfp410_readb(dvo, TFP410_DE_CTL, &val);
 283         DRM_DEBUG_KMS("TFP410_DE_CTL: 0x%02X\n", val);
 284         tfp410_readb(dvo, TFP410_DE_TOP, &val);
 285         DRM_DEBUG_KMS("TFP410_DE_TOP: 0x%02X\n", val);
 286         tfp410_readb(dvo, TFP410_DE_CNT_LO, &val);
 287         tfp410_readb(dvo, TFP410_DE_CNT_HI, &val2);
 288         DRM_DEBUG_KMS("TFP410_DE_CNT: 0x%02X%02X\n", val2, val);
 289         tfp410_readb(dvo, TFP410_DE_LIN_LO, &val);
 290         tfp410_readb(dvo, TFP410_DE_LIN_HI, &val2);
 291         DRM_DEBUG_KMS("TFP410_DE_LIN: 0x%02X%02X\n", val2, val);
 292         tfp410_readb(dvo, TFP410_H_RES_LO, &val);
 293         tfp410_readb(dvo, TFP410_H_RES_HI, &val2);
 294         DRM_DEBUG_KMS("TFP410_H_RES: 0x%02X%02X\n", val2, val);
 295         tfp410_readb(dvo, TFP410_V_RES_LO, &val);
 296         tfp410_readb(dvo, TFP410_V_RES_HI, &val2);
 297         DRM_DEBUG_KMS("TFP410_V_RES: 0x%02X%02X\n", val2, val);
 298 }
 299
 300 static void tfp410_destroy(struct intel_dvo_device *dvo)
 301 {
 302         struct tfp410_priv *tfp = dvo->dev_priv;
 303
 304         if (tfp) {
 305                 kfree(tfp);
 306                 dvo->dev_priv = NULL;
 307         }
 308 }
 309
 310 const struct intel_dvo_dev_ops tfp410_ops = {
 311         .init = tfp410_init,
 312         .detect = tfp410_detect,
 313         .mode_valid = tfp410_mode_valid,
 314         .mode_set = tfp410_mode_set,
 315         .dpms = tfp410_dpms,
 316         .get_hw_state = tfp410_get_hw_state,
 317         .dump_regs = tfp410_dump_regs,
 318         .destroy = tfp410_destroy,
 319 };