drivers/gpu/drm/i915/dvo_sil164.c

   1 /**************************************************************************
   2
   3 Copyright © 2006 Dave Airlie
   4
   5 All Rights Reserved.
   6
   7 Permission is hereby granted, free of charge, to any person obtaining a
   8 copy of this software and associated documentation files (the
   9 "Software"), to deal in the Software without restriction, including
  10 without limitation the rights to use, copy, modify, merge, publish,
  11 distribute, sub license, and/or sell copies of the Software, and to
  12 permit persons to whom the Software is furnished to do so, subject to
  13 the following conditions:
  14
  15 The above copyright notice and this permission notice (including the
  16 next paragraph) shall be included in all copies or substantial portions
  17 of the Software.
  18
  19 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  20 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  21 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  22 IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  23 ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  24 TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  25 SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  26
  27 **************************************************************************/
  28
  29 #include "dvo.h"
  30
  31 #define SIL164_VID 0x0001
  32 #define SIL164_DID 0x0006
  33
  34 #define SIL164_VID_LO 0x00
  35 #define SIL164_VID_HI 0x01
  36 #define SIL164_DID_LO 0x02
  37 #define SIL164_DID_HI 0x03
  38 #define SIL164_REV    0x04
  39 #define SIL164_RSVD   0x05
  40 #define SIL164_FREQ_LO 0x06
  41 #define SIL164_FREQ_HI 0x07
  42
  43 #define SIL164_REG8 0x08
  44 #define SIL164_8_VEN (1<<5)
  45 #define SIL164_8_HEN (1<<4)
  46 #define SIL164_8_DSEL (1<<3)
  47 #define SIL164_8_BSEL (1<<2)
  48 #define SIL164_8_EDGE (1<<1)
  49 #define SIL164_8_PD   (1<<0)
  50
  51 #define SIL164_REG9 0x09
  52 #define SIL164_9_VLOW (1<<7)
  53 #define SIL164_9_MSEL_MASK (0x7<<4)
  54 #define SIL164_9_TSEL (1<<3)
  55 #define SIL164_9_RSEN (1<<2)
  56 #define SIL164_9_HTPLG (1<<1)
  57 #define SIL164_9_MDI (1<<0)
  58
  59 #define SIL164_REGC 0x0c
  60
  61 struct sil164_priv {
  62         //I2CDevRec d;
  63         bool quiet;
  64 };
  65
  66 #define SILPTR(d) ((SIL164Ptr)(d->DriverPrivate.ptr))
  67
  68 static bool sil164_readb(struct intel_dvo_device *dvo, int addr, u8 *ch)
  69 {
  70         struct sil164_priv *sil = dvo->dev_priv;
  71         struct i2c_adapter *adapter = dvo->i2c_bus;
  72         u8 out_buf[2];
  73         u8 in_buf[2];
  74
  75         struct i2c_msg msgs[] = {
  76                 {
  77                         .addr = dvo->slave_addr,
  78                         .flags = 0,
  79                         .len = 1,
  80                         .buf = out_buf,
  81                 },
  82                 {
  83                         .addr = dvo->slave_addr,
  84                         .flags = I2C_M_RD,
  85                         .len = 1,
  86                         .buf = in_buf,
  87                 }
  88         };
  89
  90         out_buf[0] = addr;
  91         out_buf[1] = 0;
  92
  93         if (i2c_transfer(adapter, msgs, 2) == 2) {
  94                 *ch = in_buf[0];
  95                 return true;
  96         }
  97
  98         if (!sil->quiet) {
  99                 DRM_DEBUG_KMS("Unable to read register 0x%02x from %s:%02x.\n",
 100                           addr, adapter->name, dvo->slave_addr);
 101         }
 102         return false;
 103 }
 104
 105 static bool sil164_writeb(struct intel_dvo_device *dvo, int addr, u8 ch)
 106 {
 107         struct sil164_priv *sil = dvo->dev_priv;
 108         struct i2c_adapter *adapter = dvo->i2c_bus;
 109         u8 out_buf[2];
 110         struct i2c_msg msg = {
 111                 .addr = dvo->slave_addr,
 112                 .flags = 0,
 113                 .len = 2,
 114                 .buf = out_buf,
 115         };
 116
 117         out_buf[0] = addr;
 118         out_buf[1] = ch;
 119
 120         if (i2c_transfer(adapter, &msg, 1) == 1)
 121                 return true;
 122
 123         if (!sil->quiet) {
 124                 DRM_DEBUG_KMS("Unable to write register 0x%02x to %s:%d.\n",
 125                           addr, adapter->name, dvo->slave_addr);
 126         }
 127
 128         return false;
 129 }
 130
 131 /* Silicon Image 164 driver for chip on i2c bus */
 132 static bool sil164_init(struct intel_dvo_device *dvo,
 133                         struct i2c_adapter *adapter)
 134 {
 135         /* this will detect the SIL164 chip on the specified i2c bus */
 136         struct sil164_priv *sil;
 137         unsigned char ch;
 138
 139         sil = kzalloc(sizeof(struct sil164_priv), GFP_KERNEL);
 140         if (sil == NULL)
 141                 return false;
 142
 143         dvo->i2c_bus = adapter;
 144         dvo->dev_priv = sil;
 145         sil->quiet = true;
 146
 147         if (!sil164_readb(dvo, SIL164_VID_LO, &ch))
 148                 goto out;
 149
 150         if (ch != (SIL164_VID & 0xff)) {
 151                 DRM_DEBUG_KMS("sil164 not detected got %d: from %s Slave %d.\n",
 152                           ch, adapter->name, dvo->slave_addr);
 153                 goto out;
 154         }
 155
 156         if (!sil164_readb(dvo, SIL164_DID_LO, &ch))
 157                 goto out;
 158
 159         if (ch != (SIL164_DID & 0xff)) {
 160                 DRM_DEBUG_KMS("sil164 not detected got %d: from %s Slave %d.\n",
 161                           ch, adapter->name, dvo->slave_addr);
 162                 goto out;
 163         }
 164         sil->quiet = false;
 165
 166         DRM_DEBUG_KMS("init sil164 dvo controller successfully!\n");
 167         return true;
 168
 169 out:
 170         kfree(sil);
 171         return false;
 172 }
 173
 174 static enum drm_connector_status sil164_detect(struct intel_dvo_device *dvo)
 175 {
 176         u8 reg9;
 177
 178         sil164_readb(dvo, SIL164_REG9, &reg9);
 179
 180         if (reg9 & SIL164_9_HTPLG)
 181                 return connector_status_connected;
 182         else
 183                 return connector_status_disconnected;
 184 }
 185
 186 static enum drm_mode_status sil164_mode_valid(struct intel_dvo_device *dvo,
 187                                               struct drm_display_mode *mode)
 188 {
 189         return MODE_OK;
 190 }
 191
 192 static void sil164_mode_set(struct intel_dvo_device *dvo,
 193                             const struct drm_display_mode *mode,
 194                             const struct drm_display_mode *adjusted_mode)
 195 {
 196         /* As long as the basics are set up, since we don't have clock
 197          * dependencies in the mode setup, we can just leave the
 198          * registers alone and everything will work fine.
 199          */
 200         /* recommended programming sequence from doc */
 201         /*sil164_writeb(sil, 0x08, 0x30);
 202           sil164_writeb(sil, 0x09, 0x00);
 203           sil164_writeb(sil, 0x0a, 0x90);
 204           sil164_writeb(sil, 0x0c, 0x89);
 205           sil164_writeb(sil, 0x08, 0x31);*/
 206         /* don't do much */
 207         return;
 208 }
 209
 210 /* set the SIL164 power state */
 211 static void sil164_dpms(struct intel_dvo_device *dvo, bool enable)
 212 {
 213         int ret;
 214         unsigned char ch;
 215
 216         ret = sil164_readb(dvo, SIL164_REG8, &ch);
 217         if (ret == false)
 218                 return;
 219
 220         if (enable)
 221                 ch |= SIL164_8_PD;
 222         else
 223                 ch &= ~SIL164_8_PD;
 224
 225         sil164_writeb(dvo, SIL164_REG8, ch);
 226         return;
 227 }
 228
 229 static bool sil164_get_hw_state(struct intel_dvo_device *dvo)
 230 {
 231         int ret;
 232         unsigned char ch;
 233
 234         ret = sil164_readb(dvo, SIL164_REG8, &ch);
 235         if (ret == false)
 236                 return false;
 237
 238         if (ch & SIL164_8_PD)
 239                 return true;
 240         else
 241                 return false;
 242 }
 243
 244 static void sil164_dump_regs(struct intel_dvo_device *dvo)
 245 {
 246         u8 val;
 247
 248         sil164_readb(dvo, SIL164_FREQ_LO, &val);
 249         DRM_DEBUG_KMS("SIL164_FREQ_LO: 0x%02x\n", val);
 250         sil164_readb(dvo, SIL164_FREQ_HI, &val);
 251         DRM_DEBUG_KMS("SIL164_FREQ_HI: 0x%02x\n", val);
 252         sil164_readb(dvo, SIL164_REG8, &val);
 253         DRM_DEBUG_KMS("SIL164_REG8: 0x%02x\n", val);
 254         sil164_readb(dvo, SIL164_REG9, &val);
 255         DRM_DEBUG_KMS("SIL164_REG9: 0x%02x\n", val);
 256         sil164_readb(dvo, SIL164_REGC, &val);
 257         DRM_DEBUG_KMS("SIL164_REGC: 0x%02x\n", val);
 258 }
 259
 260 static void sil164_destroy(struct intel_dvo_device *dvo)
 261 {
 262         struct sil164_priv *sil = dvo->dev_priv;
 263
 264         if (sil) {
 265                 kfree(sil);
 266                 dvo->dev_priv = NULL;
 267         }
 268 }
 269
 270 const struct intel_dvo_dev_ops sil164_ops = {
 271         .init = sil164_init,
 272         .detect = sil164_detect,
 273         .mode_valid = sil164_mode_valid,
 274         .mode_set = sil164_mode_set,
 275         .dpms = sil164_dpms,
 276         .get_hw_state = sil164_get_hw_state,
 277         .dump_regs = sil164_dump_regs,
 278         .destroy = sil164_destroy,
 279 };