LXR linux/drivers/gpu/drm/i915/dvo

   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
  89struct tfp410_priv {
  90        bool quiet;
  91};
  92
  93static 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
 130static 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
 156static 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 */
 168static 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;
 198out:
 199        kfree(tfp);
 200        return false;
 201}
 202
 203static 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
 218static 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
 224static void tfp410_mode_set(struct intel_dvo_device *dvo,
 225                            const struct drm_display_mode *mode,
 226                            const 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 */
 237static 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
 252static 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
 265static 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
 299static 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
 309const 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};
 319