Pileus Git - ~andy/linux/blob - drivers/video/omap2/displays/panel-tfp410.c

   1 /*
   2  * TFP410 DPI-to-DVI chip
   3  *
   4  * Copyright (C) 2011 Texas Instruments Inc
   5  * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License version 2 as published by
   9  * the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  14  * more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along with
  17  * this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include <linux/module.h>
  21 #include <linux/slab.h>
  22 #include <video/omapdss.h>
  23 #include <linux/i2c.h>
  24 #include <linux/gpio.h>
  25 #include <drm/drm_edid.h>
  26
  27 #include <video/omap-panel-tfp410.h>
  28
  29 static const struct omap_video_timings tfp410_default_timings = {
  30         .x_res          = 640,
  31         .y_res          = 480,
  32
  33         .pixel_clock    = 23500,
  34
  35         .hfp            = 48,
  36         .hsw            = 32,
  37         .hbp            = 80,
  38
  39         .vfp            = 3,
  40         .vsw            = 4,
  41         .vbp            = 7,
  42 };
  43
  44 struct panel_drv_data {
  45         struct omap_dss_device *dssdev;
  46
  47         struct mutex lock;
  48
  49         int pd_gpio;
  50
  51         struct i2c_adapter *i2c_adapter;
  52 };
  53
  54 static int tfp410_power_on(struct omap_dss_device *dssdev)
  55 {
  56         struct panel_drv_data *ddata = dev_get_drvdata(&dssdev->dev);
  57         int r;
  58
  59         if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE)
  60                 return 0;
  61
  62         r = omapdss_dpi_display_enable(dssdev);
  63         if (r)
  64                 goto err0;
  65
  66         if (gpio_is_valid(ddata->pd_gpio))
  67                 gpio_set_value_cansleep(ddata->pd_gpio, 1);
  68
  69         return 0;
  70 err0:
  71         return r;
  72 }
  73
  74 static void tfp410_power_off(struct omap_dss_device *dssdev)
  75 {
  76         struct panel_drv_data *ddata = dev_get_drvdata(&dssdev->dev);
  77
  78         if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE)
  79                 return;
  80
  81         if (gpio_is_valid(ddata->pd_gpio))
  82                 gpio_set_value_cansleep(ddata->pd_gpio, 0);
  83
  84         omapdss_dpi_display_disable(dssdev);
  85 }
  86
  87 static int tfp410_probe(struct omap_dss_device *dssdev)
  88 {
  89         struct panel_drv_data *ddata;
  90         int r;
  91         int i2c_bus_num;
  92
  93         ddata = devm_kzalloc(&dssdev->dev, sizeof(*ddata), GFP_KERNEL);
  94         if (!ddata)
  95                 return -ENOMEM;
  96
  97         dssdev->panel.timings = tfp410_default_timings;
  98
  99         ddata->dssdev = dssdev;
 100         mutex_init(&ddata->lock);
 101
 102         if (dssdev->data) {
 103                 struct tfp410_platform_data *pdata = dssdev->data;
 104
 105                 ddata->pd_gpio = pdata->power_down_gpio;
 106                 i2c_bus_num = pdata->i2c_bus_num;
 107         } else {
 108                 ddata->pd_gpio = -1;
 109                 i2c_bus_num = -1;
 110         }
 111
 112         if (gpio_is_valid(ddata->pd_gpio)) {
 113                 r = gpio_request_one(ddata->pd_gpio, GPIOF_OUT_INIT_LOW,
 114                                 "tfp410 pd");
 115                 if (r) {
 116                         dev_err(&dssdev->dev, "Failed to request PD GPIO %d\n",
 117                                         ddata->pd_gpio);
 118                         return r;
 119                 }
 120         }
 121
 122         if (i2c_bus_num != -1) {
 123                 struct i2c_adapter *adapter;
 124
 125                 adapter = i2c_get_adapter(i2c_bus_num);
 126                 if (!adapter) {
 127                         dev_err(&dssdev->dev, "Failed to get I2C adapter, bus %d\n",
 128                                         i2c_bus_num);
 129                         r = -EINVAL;
 130                         goto err_i2c;
 131                 }
 132
 133                 ddata->i2c_adapter = adapter;
 134         }
 135
 136         dev_set_drvdata(&dssdev->dev, ddata);
 137
 138         return 0;
 139 err_i2c:
 140         if (gpio_is_valid(ddata->pd_gpio))
 141                 gpio_free(ddata->pd_gpio);
 142         return r;
 143 }
 144
 145 static void __exit tfp410_remove(struct omap_dss_device *dssdev)
 146 {
 147         struct panel_drv_data *ddata = dev_get_drvdata(&dssdev->dev);
 148
 149         mutex_lock(&ddata->lock);
 150
 151         if (ddata->i2c_adapter)
 152                 i2c_put_adapter(ddata->i2c_adapter);
 153
 154         if (gpio_is_valid(ddata->pd_gpio))
 155                 gpio_free(ddata->pd_gpio);
 156
 157         dev_set_drvdata(&dssdev->dev, NULL);
 158
 159         mutex_unlock(&ddata->lock);
 160 }
 161
 162 static int tfp410_enable(struct omap_dss_device *dssdev)
 163 {
 164         struct panel_drv_data *ddata = dev_get_drvdata(&dssdev->dev);
 165         int r;
 166
 167         mutex_lock(&ddata->lock);
 168
 169         r = tfp410_power_on(dssdev);
 170         if (r == 0)
 171                 dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
 172
 173         mutex_unlock(&ddata->lock);
 174
 175         return r;
 176 }
 177
 178 static void tfp410_disable(struct omap_dss_device *dssdev)
 179 {
 180         struct panel_drv_data *ddata = dev_get_drvdata(&dssdev->dev);
 181
 182         mutex_lock(&ddata->lock);
 183
 184         tfp410_power_off(dssdev);
 185
 186         dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
 187
 188         mutex_unlock(&ddata->lock);
 189 }
 190
 191 static int tfp410_suspend(struct omap_dss_device *dssdev)
 192 {
 193         struct panel_drv_data *ddata = dev_get_drvdata(&dssdev->dev);
 194
 195         mutex_lock(&ddata->lock);
 196
 197         tfp410_power_off(dssdev);
 198
 199         dssdev->state = OMAP_DSS_DISPLAY_SUSPENDED;
 200
 201         mutex_unlock(&ddata->lock);
 202
 203         return 0;
 204 }
 205
 206 static int tfp410_resume(struct omap_dss_device *dssdev)
 207 {
 208         struct panel_drv_data *ddata = dev_get_drvdata(&dssdev->dev);
 209         int r;
 210
 211         mutex_lock(&ddata->lock);
 212
 213         r = tfp410_power_on(dssdev);
 214         if (r == 0)
 215                 dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
 216
 217         mutex_unlock(&ddata->lock);
 218
 219         return r;
 220 }
 221
 222 static void tfp410_set_timings(struct omap_dss_device *dssdev,
 223                 struct omap_video_timings *timings)
 224 {
 225         struct panel_drv_data *ddata = dev_get_drvdata(&dssdev->dev);
 226
 227         mutex_lock(&ddata->lock);
 228         dpi_set_timings(dssdev, timings);
 229         mutex_unlock(&ddata->lock);
 230 }
 231
 232 static void tfp410_get_timings(struct omap_dss_device *dssdev,
 233                 struct omap_video_timings *timings)
 234 {
 235         struct panel_drv_data *ddata = dev_get_drvdata(&dssdev->dev);
 236
 237         mutex_lock(&ddata->lock);
 238         *timings = dssdev->panel.timings;
 239         mutex_unlock(&ddata->lock);
 240 }
 241
 242 static int tfp410_check_timings(struct omap_dss_device *dssdev,
 243                 struct omap_video_timings *timings)
 244 {
 245         struct panel_drv_data *ddata = dev_get_drvdata(&dssdev->dev);
 246         int r;
 247
 248         mutex_lock(&ddata->lock);
 249         r = dpi_check_timings(dssdev, timings);
 250         mutex_unlock(&ddata->lock);
 251
 252         return r;
 253 }
 254
 255
 256 static int tfp410_ddc_read(struct i2c_adapter *adapter,
 257                 unsigned char *buf, u16 count, u8 offset)
 258 {
 259         int r, retries;
 260
 261         for (retries = 3; retries > 0; retries--) {
 262                 struct i2c_msg msgs[] = {
 263                         {
 264                                 .addr   = DDC_ADDR,
 265                                 .flags  = 0,
 266                                 .len    = 1,
 267                                 .buf    = &offset,
 268                         }, {
 269                                 .addr   = DDC_ADDR,
 270                                 .flags  = I2C_M_RD,
 271                                 .len    = count,
 272                                 .buf    = buf,
 273                         }
 274                 };
 275
 276                 r = i2c_transfer(adapter, msgs, 2);
 277                 if (r == 2)
 278                         return 0;
 279
 280                 if (r != -EAGAIN)
 281                         break;
 282         }
 283
 284         return r < 0 ? r : -EIO;
 285 }
 286
 287 static int tfp410_read_edid(struct omap_dss_device *dssdev,
 288                 u8 *edid, int len)
 289 {
 290         struct panel_drv_data *ddata = dev_get_drvdata(&dssdev->dev);
 291         int r, l, bytes_read;
 292
 293         mutex_lock(&ddata->lock);
 294
 295         if (!ddata->i2c_adapter) {
 296                 r = -ENODEV;
 297                 goto err;
 298         }
 299
 300         l = min(EDID_LENGTH, len);
 301         r = tfp410_ddc_read(ddata->i2c_adapter, edid, l, 0);
 302         if (r)
 303                 goto err;
 304
 305         bytes_read = l;
 306
 307         /* if there are extensions, read second block */
 308         if (len > EDID_LENGTH && edid[0x7e] > 0) {
 309                 l = min(EDID_LENGTH, len - EDID_LENGTH);
 310
 311                 r = tfp410_ddc_read(ddata->i2c_adapter, edid + EDID_LENGTH,
 312                                 l, EDID_LENGTH);
 313                 if (r)
 314                         goto err;
 315
 316                 bytes_read += l;
 317         }
 318
 319         mutex_unlock(&ddata->lock);
 320
 321         return bytes_read;
 322
 323 err:
 324         mutex_unlock(&ddata->lock);
 325         return r;
 326 }
 327
 328 static bool tfp410_detect(struct omap_dss_device *dssdev)
 329 {
 330         struct panel_drv_data *ddata = dev_get_drvdata(&dssdev->dev);
 331         unsigned char out;
 332         int r;
 333
 334         mutex_lock(&ddata->lock);
 335
 336         if (!ddata->i2c_adapter)
 337                 goto out;
 338
 339         r = tfp410_ddc_read(ddata->i2c_adapter, &out, 1, 0);
 340
 341         mutex_unlock(&ddata->lock);
 342
 343         return r == 0;
 344
 345 out:
 346         mutex_unlock(&ddata->lock);
 347         return true;
 348 }
 349
 350 static struct omap_dss_driver tfp410_driver = {
 351         .probe          = tfp410_probe,
 352         .remove         = __exit_p(tfp410_remove),
 353
 354         .enable         = tfp410_enable,
 355         .disable        = tfp410_disable,
 356         .suspend        = tfp410_suspend,
 357         .resume         = tfp410_resume,
 358
 359         .set_timings    = tfp410_set_timings,
 360         .get_timings    = tfp410_get_timings,
 361         .check_timings  = tfp410_check_timings,
 362
 363         .read_edid      = tfp410_read_edid,
 364         .detect         = tfp410_detect,
 365
 366         .driver         = {
 367                 .name   = "tfp410",
 368                 .owner  = THIS_MODULE,
 369         },
 370 };
 371
 372 static int __init tfp410_init(void)
 373 {
 374         return omap_dss_register_driver(&tfp410_driver);
 375 }
 376
 377 static void __exit tfp410_exit(void)
 378 {
 379         omap_dss_unregister_driver(&tfp410_driver);
 380 }
 381
 382 module_init(tfp410_init);
 383 module_exit(tfp410_exit);
 384 MODULE_LICENSE("GPL");