drivers/video/omap2/displays/panel-lgphilips-lb035q02.c

   1 /*
   2  * LCD panel driver for LG.Philips LB035Q02
   3  *
   4  * Author: Steve Sakoman <steve@sakoman.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License version 2 as published by
   8  * the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13  * more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along with
  16  * this program.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #include <linux/module.h>
  20 #include <linux/delay.h>
  21 #include <linux/spi/spi.h>
  22 #include <linux/mutex.h>
  23
  24 #include <video/omapdss.h>
  25
  26 struct lb035q02_data {
  27         struct mutex lock;
  28 };
  29
  30 static struct omap_video_timings lb035q02_timings = {
  31         .x_res = 320,
  32         .y_res = 240,
  33
  34         .pixel_clock    = 6500,
  35
  36         .hsw            = 2,
  37         .hfp            = 20,
  38         .hbp            = 68,
  39
  40         .vsw            = 2,
  41         .vfp            = 4,
  42         .vbp            = 18,
  43
  44         .vsync_level    = OMAPDSS_SIG_ACTIVE_LOW,
  45         .hsync_level    = OMAPDSS_SIG_ACTIVE_LOW,
  46         .data_pclk_edge = OMAPDSS_DRIVE_SIG_RISING_EDGE,
  47         .de_level       = OMAPDSS_SIG_ACTIVE_HIGH,
  48         .sync_pclk_edge = OMAPDSS_DRIVE_SIG_OPPOSITE_EDGES,
  49 };
  50
  51 static int lb035q02_panel_power_on(struct omap_dss_device *dssdev)
  52 {
  53         int r;
  54
  55         if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE)
  56                 return 0;
  57
  58         omapdss_dpi_set_timings(dssdev, &dssdev->panel.timings);
  59         omapdss_dpi_set_data_lines(dssdev, dssdev->phy.dpi.data_lines);
  60
  61         r = omapdss_dpi_display_enable(dssdev);
  62         if (r)
  63                 goto err0;
  64
  65         if (dssdev->platform_enable) {
  66                 r = dssdev->platform_enable(dssdev);
  67                 if (r)
  68                         goto err1;
  69         }
  70
  71         return 0;
  72 err1:
  73         omapdss_dpi_display_disable(dssdev);
  74 err0:
  75         return r;
  76 }
  77
  78 static void lb035q02_panel_power_off(struct omap_dss_device *dssdev)
  79 {
  80         if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE)
  81                 return;
  82
  83         if (dssdev->platform_disable)
  84                 dssdev->platform_disable(dssdev);
  85
  86         omapdss_dpi_display_disable(dssdev);
  87 }
  88
  89 static int lb035q02_panel_probe(struct omap_dss_device *dssdev)
  90 {
  91         struct lb035q02_data *ld;
  92         int r;
  93
  94         dssdev->panel.timings = lb035q02_timings;
  95
  96         ld = kzalloc(sizeof(*ld), GFP_KERNEL);
  97         if (!ld) {
  98                 r = -ENOMEM;
  99                 goto err;
 100         }
 101         mutex_init(&ld->lock);
 102         dev_set_drvdata(&dssdev->dev, ld);
 103         return 0;
 104 err:
 105         return r;
 106 }
 107
 108 static void lb035q02_panel_remove(struct omap_dss_device *dssdev)
 109 {
 110         struct lb035q02_data *ld = dev_get_drvdata(&dssdev->dev);
 111
 112         kfree(ld);
 113 }
 114
 115 static int lb035q02_panel_enable(struct omap_dss_device *dssdev)
 116 {
 117         struct lb035q02_data *ld = dev_get_drvdata(&dssdev->dev);
 118         int r;
 119
 120         mutex_lock(&ld->lock);
 121
 122         r = lb035q02_panel_power_on(dssdev);
 123         if (r)
 124                 goto err;
 125         dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
 126
 127         mutex_unlock(&ld->lock);
 128         return 0;
 129 err:
 130         mutex_unlock(&ld->lock);
 131         return r;
 132 }
 133
 134 static void lb035q02_panel_disable(struct omap_dss_device *dssdev)
 135 {
 136         struct lb035q02_data *ld = dev_get_drvdata(&dssdev->dev);
 137
 138         mutex_lock(&ld->lock);
 139
 140         lb035q02_panel_power_off(dssdev);
 141         dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
 142
 143         mutex_unlock(&ld->lock);
 144 }
 145
 146 static struct omap_dss_driver lb035q02_driver = {
 147         .probe          = lb035q02_panel_probe,
 148         .remove         = lb035q02_panel_remove,
 149
 150         .enable         = lb035q02_panel_enable,
 151         .disable        = lb035q02_panel_disable,
 152
 153         .driver         = {
 154                 .name   = "lgphilips_lb035q02_panel",
 155                 .owner  = THIS_MODULE,
 156         },
 157 };
 158
 159 static int lb035q02_write_reg(struct spi_device *spi, u8 reg, u16 val)
 160 {
 161         struct spi_message msg;
 162         struct spi_transfer index_xfer = {
 163                 .len            = 3,
 164                 .cs_change      = 1,
 165         };
 166         struct spi_transfer value_xfer = {
 167                 .len            = 3,
 168         };
 169         u8      buffer[16];
 170
 171         spi_message_init(&msg);
 172
 173         /* register index */
 174         buffer[0] = 0x70;
 175         buffer[1] = 0x00;
 176         buffer[2] = reg & 0x7f;
 177         index_xfer.tx_buf = buffer;
 178         spi_message_add_tail(&index_xfer, &msg);
 179
 180         /* register value */
 181         buffer[4] = 0x72;
 182         buffer[5] = val >> 8;
 183         buffer[6] = val;
 184         value_xfer.tx_buf = buffer + 4;
 185         spi_message_add_tail(&value_xfer, &msg);
 186
 187         return spi_sync(spi, &msg);
 188 }
 189
 190 static void init_lb035q02_panel(struct spi_device *spi)
 191 {
 192         /* Init sequence from page 28 of the lb035q02 spec */
 193         lb035q02_write_reg(spi, 0x01, 0x6300);
 194         lb035q02_write_reg(spi, 0x02, 0x0200);
 195         lb035q02_write_reg(spi, 0x03, 0x0177);
 196         lb035q02_write_reg(spi, 0x04, 0x04c7);
 197         lb035q02_write_reg(spi, 0x05, 0xffc0);
 198         lb035q02_write_reg(spi, 0x06, 0xe806);
 199         lb035q02_write_reg(spi, 0x0a, 0x4008);
 200         lb035q02_write_reg(spi, 0x0b, 0x0000);
 201         lb035q02_write_reg(spi, 0x0d, 0x0030);
 202         lb035q02_write_reg(spi, 0x0e, 0x2800);
 203         lb035q02_write_reg(spi, 0x0f, 0x0000);
 204         lb035q02_write_reg(spi, 0x16, 0x9f80);
 205         lb035q02_write_reg(spi, 0x17, 0x0a0f);
 206         lb035q02_write_reg(spi, 0x1e, 0x00c1);
 207         lb035q02_write_reg(spi, 0x30, 0x0300);
 208         lb035q02_write_reg(spi, 0x31, 0x0007);
 209         lb035q02_write_reg(spi, 0x32, 0x0000);
 210         lb035q02_write_reg(spi, 0x33, 0x0000);
 211         lb035q02_write_reg(spi, 0x34, 0x0707);
 212         lb035q02_write_reg(spi, 0x35, 0x0004);
 213         lb035q02_write_reg(spi, 0x36, 0x0302);
 214         lb035q02_write_reg(spi, 0x37, 0x0202);
 215         lb035q02_write_reg(spi, 0x3a, 0x0a0d);
 216         lb035q02_write_reg(spi, 0x3b, 0x0806);
 217 }
 218
 219 static int lb035q02_panel_spi_probe(struct spi_device *spi)
 220 {
 221         init_lb035q02_panel(spi);
 222         return omap_dss_register_driver(&lb035q02_driver);
 223 }
 224
 225 static int lb035q02_panel_spi_remove(struct spi_device *spi)
 226 {
 227         omap_dss_unregister_driver(&lb035q02_driver);
 228         return 0;
 229 }
 230
 231 static struct spi_driver lb035q02_spi_driver = {
 232         .driver         = {
 233                 .name   = "lgphilips_lb035q02_panel-spi",
 234                 .owner  = THIS_MODULE,
 235         },
 236         .probe          = lb035q02_panel_spi_probe,
 237         .remove         = lb035q02_panel_spi_remove,
 238 };
 239
 240 module_spi_driver(lb035q02_spi_driver);
 241
 242 MODULE_LICENSE("GPL");