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, uint8_t *ch)
  69 {
  70         struct sil164_priv *sil = dvo->dev_priv;
  71         struct i2c_adapter *adapter = dvo->i2c_bus;
  72         struct intel_i2c_chan *i2cbus = container_of(adapter, struct intel_i2c_chan, adapter);
  73         u8 out_buf[2];
  74         u8 in_buf[2];
  75
  76         struct i2c_msg msgs[] = {
  77                 {
  78                         .addr = dvo->slave_addr,
  79                         .flags = 0,
  80                         .len = 1,
  81                         .buf = out_buf,
  82                 },
  83                 {
  84                         .addr = dvo->slave_addr,
  85                         .flags = I2C_M_RD,
  86                         .len = 1,
  87                         .buf = in_buf,
  88                 }
  89         };
  90
  91         out_buf[0] = addr;
  92         out_buf[1] = 0;
  93
  94         if (i2c_transfer(&i2cbus->adapter, msgs, 2) == 2) {
  95                 *ch = in_buf[0];
  96                 return true;
  97         };
  98
  99         if (!sil->quiet) {
 100                 DRM_DEBUG_KMS("Unable to read register 0x%02x from %s:%02x.\n",
 101                           addr, i2cbus->adapter.name, dvo->slave_addr);
 102         }
 103         return false;
 104 }
 105
 106 static bool sil164_writeb(struct intel_dvo_device *dvo, int addr, uint8_t ch)
 107 {
 108         struct sil164_priv *sil= dvo->dev_priv;
 109         struct i2c_adapter *adapter = dvo->i2c_bus;
 110         struct intel_i2c_chan *i2cbus = container_of(adapter, struct intel_i2c_chan, adapter);
 111         uint8_t out_buf[2];
 112         struct i2c_msg msg = {
 113                 .addr = dvo->slave_addr,
 114                 .flags = 0,
 115                 .len = 2,
 116                 .buf = out_buf,
 117         };
 118
 119         out_buf[0] = addr;
 120         out_buf[1] = ch;
 121
 122         if (i2c_transfer(&i2cbus->adapter, &msg, 1) == 1)
 123                 return true;
 124
 125         if (!sil->quiet) {
 126                 DRM_DEBUG_KMS("Unable to write register 0x%02x to %s:%d.\n",
 127                           addr, i2cbus->adapter.name, dvo->slave_addr);
 128         }
 129
 130         return false;
 131 }
 132
 133 /* Silicon Image 164 driver for chip on i2c bus */
 134 static bool sil164_init(struct intel_dvo_device *dvo,
 135                         struct i2c_adapter *adapter)
 136 {
 137         /* this will detect the SIL164 chip on the specified i2c bus */
 138         struct sil164_priv *sil;
 139         unsigned char ch;
 140
 141         sil = kzalloc(sizeof(struct sil164_priv), GFP_KERNEL);
 142         if (sil == NULL)
 143                 return false;
 144
 145         dvo->i2c_bus = adapter;
 146         dvo->dev_priv = sil;
 147         sil->quiet = true;
 148
 149         if (!sil164_readb(dvo, SIL164_VID_LO, &ch))
 150                 goto out;
 151
 152         if (ch != (SIL164_VID & 0xff)) {
 153                 DRM_DEBUG_KMS("sil164 not detected got %d: from %s Slave %d.\n",
 154                           ch, adapter->name, dvo->slave_addr);
 155                 goto out;
 156         }
 157
 158         if (!sil164_readb(dvo, SIL164_DID_LO, &ch))
 159                 goto out;
 160
 161         if (ch != (SIL164_DID & 0xff)) {
 162                 DRM_DEBUG_KMS("sil164 not detected got %d: from %s Slave %d.\n",
 163                           ch, adapter->name, dvo->slave_addr);
 164                 goto out;
 165         }
 166         sil->quiet = false;
 167
 168         DRM_DEBUG_KMS("init sil164 dvo controller successfully!\n");
 169         return true;
 170
 171 out:
 172         kfree(sil);
 173         return false;
 174 }
 175
 176 static enum drm_connector_status sil164_detect(struct intel_dvo_device *dvo)
 177 {
 178         uint8_t reg9;
 179
 180         sil164_readb(dvo, SIL164_REG9, &reg9);
 181
 182         if (reg9 & SIL164_9_HTPLG)
 183                 return connector_status_connected;
 184         else
 185                 return connector_status_disconnected;
 186 }
 187
 188 static enum drm_mode_status sil164_mode_valid(struct intel_dvo_device *dvo,
 189                                               struct drm_display_mode *mode)
 190 {
 191         return MODE_OK;
 192 }
 193
 194 static void sil164_mode_set(struct intel_dvo_device *dvo,
 195                             struct drm_display_mode *mode,
 196                             struct drm_display_mode *adjusted_mode)
 197 {
 198         /* As long as the basics are set up, since we don't have clock
 199          * dependencies in the mode setup, we can just leave the
 200          * registers alone and everything will work fine.
 201          */
 202         /* recommended programming sequence from doc */
 203         /*sil164_writeb(sil, 0x08, 0x30);
 204           sil164_writeb(sil, 0x09, 0x00);
 205           sil164_writeb(sil, 0x0a, 0x90);
 206           sil164_writeb(sil, 0x0c, 0x89);
 207           sil164_writeb(sil, 0x08, 0x31);*/
 208         /* don't do much */
 209         return;
 210 }
 211
 212 /* set the SIL164 power state */
 213 static void sil164_dpms(struct intel_dvo_device *dvo, int mode)
 214 {
 215         int ret;
 216         unsigned char ch;
 217
 218         ret = sil164_readb(dvo, SIL164_REG8, &ch);
 219         if (ret == false)
 220                 return;
 221
 222         if (mode == DRM_MODE_DPMS_ON)
 223                 ch |= SIL164_8_PD;
 224         else
 225                 ch &= ~SIL164_8_PD;
 226
 227         sil164_writeb(dvo, SIL164_REG8, ch);
 228         return;
 229 }
 230
 231 static void sil164_dump_regs(struct intel_dvo_device *dvo)
 232 {
 233         uint8_t val;
 234
 235         sil164_readb(dvo, SIL164_FREQ_LO, &val);
 236         DRM_LOG_KMS("SIL164_FREQ_LO: 0x%02x\n", val);
 237         sil164_readb(dvo, SIL164_FREQ_HI, &val);
 238         DRM_LOG_KMS("SIL164_FREQ_HI: 0x%02x\n", val);
 239         sil164_readb(dvo, SIL164_REG8, &val);
 240         DRM_LOG_KMS("SIL164_REG8: 0x%02x\n", val);
 241         sil164_readb(dvo, SIL164_REG9, &val);
 242         DRM_LOG_KMS("SIL164_REG9: 0x%02x\n", val);
 243         sil164_readb(dvo, SIL164_REGC, &val);
 244         DRM_LOG_KMS("SIL164_REGC: 0x%02x\n", val);
 245 }
 246
 247 static void sil164_destroy(struct intel_dvo_device *dvo)
 248 {
 249         struct sil164_priv *sil = dvo->dev_priv;
 250
 251         if (sil) {
 252                 kfree(sil);
 253                 dvo->dev_priv = NULL;
 254         }
 255 }
 256
 257 struct intel_dvo_dev_ops sil164_ops = {
 258         .init = sil164_init,
 259         .detect = sil164_detect,
 260         .mode_valid = sil164_mode_valid,
 261         .mode_set = sil164_mode_set,
 262         .dpms = sil164_dpms,
 263         .dump_regs = sil164_dump_regs,
 264         .destroy = sil164_destroy,
 265 };