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_priv {
  90         bool quiet;
  91 };
  92
  93 static bool tfp410_readb(struct intel_dvo_device *dvo, int addr, uint8_t *ch)
  94 {
  95         struct tfp410_priv *tfp = dvo->dev_priv;
  96         struct i2c_adapter *adapter = dvo->i2c_bus;
  97         u8 out_buf[2];
  98         u8 in_buf[2];
  99
 100         struct i2c_msg msgs[] = {
 101                 {
 102                         .addr = dvo->slave_addr,
 103                         .flags = 0,
 104                         .len = 1,
 105                         .buf = out_buf,
 106                 },
 107                 {
 108                         .addr = dvo->slave_addr,
 109                         .flags = I2C_M_RD,
 110                         .len = 1,
 111                         .buf = in_buf,
 112                 }
 113         };
 114
 115         out_buf[0] = addr;
 116         out_buf[1] = 0;
 117
 118         if (i2c_transfer(adapter, msgs, 2) == 2) {
 119                 *ch = in_buf[0];
 120                 return true;
 121         }
 122
 123         if (!tfp->quiet) {
 124                 DRM_DEBUG_KMS("Unable to read register 0x%02x from %s:%02x.\n",
 125                           addr, adapter->name, dvo->slave_addr);
 126         }
 127         return false;
 128 }
 129
 130 static bool tfp410_writeb(struct intel_dvo_device *dvo, int addr, uint8_t ch)
 131 {
 132         struct tfp410_priv *tfp = dvo->dev_priv;
 133         struct i2c_adapter *adapter = dvo->i2c_bus;
 134         uint8_t out_buf[2];
 135         struct i2c_msg msg = {
 136                 .addr = dvo->slave_addr,
 137                 .flags = 0,
 138                 .len = 2,
 139                 .buf = out_buf,
 140         };
 141
 142         out_buf[0] = addr;
 143         out_buf[1] = ch;
 144
 145         if (i2c_transfer(adapter, &msg, 1) == 1)
 146                 return true;
 147
 148         if (!tfp->quiet) {
 149                 DRM_DEBUG_KMS("Unable to write register 0x%02x to %s:%d.\n",
 150                           addr, adapter->name, dvo->slave_addr);
 151         }
 152
 153         return false;
 154 }
 155
 156 static int tfp410_getid(struct intel_dvo_device *dvo, int addr)
 157 {
 158         uint8_t ch1, ch2;
 159
 160         if (tfp410_readb(dvo, addr+0, &ch1) &&
 161             tfp410_readb(dvo, addr+1, &ch2))
 162                 return ((ch2 << 8) & 0xFF00) | (ch1 & 0x00FF);
 163
 164         return -1;
 165 }
 166
 167 /* Ti TFP410 driver for chip on i2c bus */
 168 static bool tfp410_init(struct intel_dvo_device *dvo,
 169                         struct i2c_adapter *adapter)
 170 {
 171         /* this will detect the tfp410 chip on the specified i2c bus */
 172         struct tfp410_priv *tfp;
 173         int id;
 174
 175         tfp = kzalloc(sizeof(struct tfp410_priv), GFP_KERNEL);
 176         if (tfp == NULL)
 177                 return false;
 178
 179         dvo->i2c_bus = adapter;
 180         dvo->dev_priv = tfp;
 181         tfp->quiet = true;
 182
 183         if ((id = tfp410_getid(dvo, TFP410_VID_LO)) != TFP410_VID) {
 184                 DRM_DEBUG_KMS("tfp410 not detected got VID %X: from %s "
 185                                 "Slave %d.\n",
 186                           id, adapter->name, dvo->slave_addr);
 187                 goto out;
 188         }
 189
 190         if ((id = tfp410_getid(dvo, TFP410_DID_LO)) != TFP410_DID) {
 191                 DRM_DEBUG_KMS("tfp410 not detected got DID %X: from %s "
 192                                 "Slave %d.\n",
 193                           id, adapter->name, dvo->slave_addr);
 194                 goto out;
 195         }
 196         tfp->quiet = false;
 197         return true;
 198 out:
 199         kfree(tfp);
 200         return false;
 201 }
 202
 203 static enum drm_connector_status tfp410_detect(struct intel_dvo_device *dvo)
 204 {
 205         enum drm_connector_status ret = connector_status_disconnected;
 206         uint8_t ctl2;
 207
 208         if (tfp410_readb(dvo, TFP410_CTL_2, &ctl2)) {
 209                 if (ctl2 & TFP410_CTL_2_RSEN)
 210                         ret = connector_status_connected;
 211                 else
 212                         ret = connector_status_disconnected;
 213         }
 214
 215         return ret;
 216 }
 217
 218 static enum drm_mode_status tfp410_mode_valid(struct intel_dvo_device *dvo,
 219                                               struct drm_display_mode *mode)
 220 {
 221         return MODE_OK;
 222 }
 223
 224 static void tfp410_mode_set(struct intel_dvo_device *dvo,
 225                             struct drm_display_mode *mode,
 226                             struct drm_display_mode *adjusted_mode)
 227 {
 228         /* As long as the basics are set up, since we don't have clock dependencies
 229         * in the mode setup, we can just leave the registers alone and everything
 230         * will work fine.
 231         */
 232         /* don't do much */
 233         return;
 234 }
 235
 236 /* set the tfp410 power state */
 237 static void tfp410_dpms(struct intel_dvo_device *dvo, bool enable)
 238 {
 239         uint8_t ctl1;
 240
 241         if (!tfp410_readb(dvo, TFP410_CTL_1, &ctl1))
 242                 return;
 243
 244         if (enable)
 245                 ctl1 |= TFP410_CTL_1_PD;
 246         else
 247                 ctl1 &= ~TFP410_CTL_1_PD;
 248
 249         tfp410_writeb(dvo, TFP410_CTL_1, ctl1);
 250 }
 251
 252 static bool tfp410_get_hw_state(struct intel_dvo_device *dvo)
 253 {
 254         uint8_t ctl1;
 255
 256         if (!tfp410_readb(dvo, TFP410_CTL_1, &ctl1))
 257                 return false;
 258
 259         if (ctl1 & TFP410_CTL_1_PD)
 260                 return true;
 261         else
 262                 return false;
 263 }
 264
 265 static void tfp410_dump_regs(struct intel_dvo_device *dvo)
 266 {
 267         uint8_t val, val2;
 268
 269         tfp410_readb(dvo, TFP410_REV, &val);
 270         DRM_DEBUG_KMS("TFP410_REV: 0x%02X\n", val);
 271         tfp410_readb(dvo, TFP410_CTL_1, &val);
 272         DRM_DEBUG_KMS("TFP410_CTL1: 0x%02X\n", val);
 273         tfp410_readb(dvo, TFP410_CTL_2, &val);
 274         DRM_DEBUG_KMS("TFP410_CTL2: 0x%02X\n", val);
 275         tfp410_readb(dvo, TFP410_CTL_3, &val);
 276         DRM_DEBUG_KMS("TFP410_CTL3: 0x%02X\n", val);
 277         tfp410_readb(dvo, TFP410_USERCFG, &val);
 278         DRM_DEBUG_KMS("TFP410_USERCFG: 0x%02X\n", val);
 279         tfp410_readb(dvo, TFP410_DE_DLY, &val);
 280         DRM_DEBUG_KMS("TFP410_DE_DLY: 0x%02X\n", val);
 281         tfp410_readb(dvo, TFP410_DE_CTL, &val);
 282         DRM_DEBUG_KMS("TFP410_DE_CTL: 0x%02X\n", val);
 283         tfp410_readb(dvo, TFP410_DE_TOP, &val);
 284         DRM_DEBUG_KMS("TFP410_DE_TOP: 0x%02X\n", val);
 285         tfp410_readb(dvo, TFP410_DE_CNT_LO, &val);
 286         tfp410_readb(dvo, TFP410_DE_CNT_HI, &val2);
 287         DRM_DEBUG_KMS("TFP410_DE_CNT: 0x%02X%02X\n", val2, val);
 288         tfp410_readb(dvo, TFP410_DE_LIN_LO, &val);
 289         tfp410_readb(dvo, TFP410_DE_LIN_HI, &val2);
 290         DRM_DEBUG_KMS("TFP410_DE_LIN: 0x%02X%02X\n", val2, val);
 291         tfp410_readb(dvo, TFP410_H_RES_LO, &val);
 292         tfp410_readb(dvo, TFP410_H_RES_HI, &val2);
 293         DRM_DEBUG_KMS("TFP410_H_RES: 0x%02X%02X\n", val2, val);
 294         tfp410_readb(dvo, TFP410_V_RES_LO, &val);
 295         tfp410_readb(dvo, TFP410_V_RES_HI, &val2);
 296         DRM_DEBUG_KMS("TFP410_V_RES: 0x%02X%02X\n", val2, val);
 297 }
 298
 299 static void tfp410_destroy(struct intel_dvo_device *dvo)
 300 {
 301         struct tfp410_priv *tfp = dvo->dev_priv;
 302
 303         if (tfp) {
 304                 kfree(tfp);
 305                 dvo->dev_priv = NULL;
 306         }
 307 }
 308
 309 struct intel_dvo_dev_ops tfp410_ops = {
 310         .init = tfp410_init,
 311         .detect = tfp410_detect,
 312         .mode_valid = tfp410_mode_valid,
 313         .mode_set = tfp410_mode_set,
 314         .dpms = tfp410_dpms,
 315         .get_hw_state = tfp410_get_hw_state,
 316         .dump_regs = tfp410_dump_regs,
 317         .destroy = tfp410_destroy,
 318 };