omapfb/displays/panel-lgphilips-lb035q02.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * LG.Philips LB035Q02 LCD Panel driver
0004  *
0005  * Copyright (C) 2013 Texas Instruments
0006  * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
0007  * Based on a driver by: Steve Sakoman <steve@sakoman.com>
0008  */
0009
0010 #include <linux/module.h>
0011 #include <linux/delay.h>
0012 #include <linux/spi/spi.h>
0013 #include <linux/mutex.h>
0014 #include <linux/gpio.h>
0015
0016 #include <video/omapfb_dss.h>
0017
0018 static const struct omap_video_timings lb035q02_timings = {
0019     .x_res = 320,
0020     .y_res = 240,
0021
0022     .pixelclock = 6500000,
0023
0024     .hsw        = 2,
0025     .hfp        = 20,
0026     .hbp        = 68,
0027
0028     .vsw        = 2,
0029     .vfp        = 4,
0030     .vbp        = 18,
0031
0032     .vsync_level    = OMAPDSS_SIG_ACTIVE_LOW,
0033     .hsync_level    = OMAPDSS_SIG_ACTIVE_LOW,
0034     .data_pclk_edge = OMAPDSS_DRIVE_SIG_RISING_EDGE,
0035     .de_level   = OMAPDSS_SIG_ACTIVE_HIGH,
0036     .sync_pclk_edge = OMAPDSS_DRIVE_SIG_FALLING_EDGE,
0037 };
0038
0039 struct panel_drv_data {
0040     struct omap_dss_device dssdev;
0041     struct omap_dss_device *in;
0042
0043     struct spi_device *spi;
0044
0045     int data_lines;
0046
0047     struct omap_video_timings videomode;
0048
0049     /* used for non-DT boot, to be removed */
0050     int backlight_gpio;
0051
0052     struct gpio_desc *enable_gpio;
0053 };
0054
0055 #define to_panel_data(p) container_of(p, struct panel_drv_data, dssdev)
0056
0057 static int lb035q02_write_reg(struct spi_device *spi, u8 reg, u16 val)
0058 {
0059     struct spi_message msg;
0060     struct spi_transfer index_xfer = {
0061         .len        = 3,
0062         .cs_change  = 1,
0063     };
0064     struct spi_transfer value_xfer = {
0065         .len        = 3,
0066     };
0067     u8  buffer[16];
0068
0069     spi_message_init(&msg);
0070
0071     /* register index */
0072     buffer[0] = 0x70;
0073     buffer[1] = 0x00;
0074     buffer[2] = reg & 0x7f;
0075     index_xfer.tx_buf = buffer;
0076     spi_message_add_tail(&index_xfer, &msg);
0077
0078     /* register value */
0079     buffer[4] = 0x72;
0080     buffer[5] = val >> 8;
0081     buffer[6] = val;
0082     value_xfer.tx_buf = buffer + 4;
0083     spi_message_add_tail(&value_xfer, &msg);
0084
0085     return spi_sync(spi, &msg);
0086 }
0087
0088 static void init_lb035q02_panel(struct spi_device *spi)
0089 {
0090     /* Init sequence from page 28 of the lb035q02 spec */
0091     lb035q02_write_reg(spi, 0x01, 0x6300);
0092     lb035q02_write_reg(spi, 0x02, 0x0200);
0093     lb035q02_write_reg(spi, 0x03, 0x0177);
0094     lb035q02_write_reg(spi, 0x04, 0x04c7);
0095     lb035q02_write_reg(spi, 0x05, 0xffc0);
0096     lb035q02_write_reg(spi, 0x06, 0xe806);
0097     lb035q02_write_reg(spi, 0x0a, 0x4008);
0098     lb035q02_write_reg(spi, 0x0b, 0x0000);
0099     lb035q02_write_reg(spi, 0x0d, 0x0030);
0100     lb035q02_write_reg(spi, 0x0e, 0x2800);
0101     lb035q02_write_reg(spi, 0x0f, 0x0000);
0102     lb035q02_write_reg(spi, 0x16, 0x9f80);
0103     lb035q02_write_reg(spi, 0x17, 0x0a0f);
0104     lb035q02_write_reg(spi, 0x1e, 0x00c1);
0105     lb035q02_write_reg(spi, 0x30, 0x0300);
0106     lb035q02_write_reg(spi, 0x31, 0x0007);
0107     lb035q02_write_reg(spi, 0x32, 0x0000);
0108     lb035q02_write_reg(spi, 0x33, 0x0000);
0109     lb035q02_write_reg(spi, 0x34, 0x0707);
0110     lb035q02_write_reg(spi, 0x35, 0x0004);
0111     lb035q02_write_reg(spi, 0x36, 0x0302);
0112     lb035q02_write_reg(spi, 0x37, 0x0202);
0113     lb035q02_write_reg(spi, 0x3a, 0x0a0d);
0114     lb035q02_write_reg(spi, 0x3b, 0x0806);
0115 }
0116
0117 static int lb035q02_connect(struct omap_dss_device *dssdev)
0118 {
0119     struct panel_drv_data *ddata = to_panel_data(dssdev);
0120     struct omap_dss_device *in = ddata->in;
0121     int r;
0122
0123     if (omapdss_device_is_connected(dssdev))
0124         return 0;
0125
0126     r = in->ops.dpi->connect(in, dssdev);
0127     if (r)
0128         return r;
0129
0130     init_lb035q02_panel(ddata->spi);
0131
0132     return 0;
0133 }
0134
0135 static void lb035q02_disconnect(struct omap_dss_device *dssdev)
0136 {
0137     struct panel_drv_data *ddata = to_panel_data(dssdev);
0138     struct omap_dss_device *in = ddata->in;
0139
0140     if (!omapdss_device_is_connected(dssdev))
0141         return;
0142
0143     in->ops.dpi->disconnect(in, dssdev);
0144 }
0145
0146 static int lb035q02_enable(struct omap_dss_device *dssdev)
0147 {
0148     struct panel_drv_data *ddata = to_panel_data(dssdev);
0149     struct omap_dss_device *in = ddata->in;
0150     int r;
0151
0152     if (!omapdss_device_is_connected(dssdev))
0153         return -ENODEV;
0154
0155     if (omapdss_device_is_enabled(dssdev))
0156         return 0;
0157
0158     if (ddata->data_lines)
0159         in->ops.dpi->set_data_lines(in, ddata->data_lines);
0160     in->ops.dpi->set_timings(in, &ddata->videomode);
0161
0162     r = in->ops.dpi->enable(in);
0163     if (r)
0164         return r;
0165
0166     if (ddata->enable_gpio)
0167         gpiod_set_value_cansleep(ddata->enable_gpio, 1);
0168
0169     if (gpio_is_valid(ddata->backlight_gpio))
0170         gpio_set_value_cansleep(ddata->backlight_gpio, 1);
0171
0172     dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
0173
0174     return 0;
0175 }
0176
0177 static void lb035q02_disable(struct omap_dss_device *dssdev)
0178 {
0179     struct panel_drv_data *ddata = to_panel_data(dssdev);
0180     struct omap_dss_device *in = ddata->in;
0181
0182     if (!omapdss_device_is_enabled(dssdev))
0183         return;
0184
0185     if (ddata->enable_gpio)
0186         gpiod_set_value_cansleep(ddata->enable_gpio, 0);
0187
0188     if (gpio_is_valid(ddata->backlight_gpio))
0189         gpio_set_value_cansleep(ddata->backlight_gpio, 0);
0190
0191     in->ops.dpi->disable(in);
0192
0193     dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
0194 }
0195
0196 static void lb035q02_set_timings(struct omap_dss_device *dssdev,
0197         struct omap_video_timings *timings)
0198 {
0199     struct panel_drv_data *ddata = to_panel_data(dssdev);
0200     struct omap_dss_device *in = ddata->in;
0201
0202     ddata->videomode = *timings;
0203     dssdev->panel.timings = *timings;
0204
0205     in->ops.dpi->set_timings(in, timings);
0206 }
0207
0208 static void lb035q02_get_timings(struct omap_dss_device *dssdev,
0209         struct omap_video_timings *timings)
0210 {
0211     struct panel_drv_data *ddata = to_panel_data(dssdev);
0212
0213     *timings = ddata->videomode;
0214 }
0215
0216 static int lb035q02_check_timings(struct omap_dss_device *dssdev,
0217         struct omap_video_timings *timings)
0218 {
0219     struct panel_drv_data *ddata = to_panel_data(dssdev);
0220     struct omap_dss_device *in = ddata->in;
0221
0222     return in->ops.dpi->check_timings(in, timings);
0223 }
0224
0225 static struct omap_dss_driver lb035q02_ops = {
0226     .connect    = lb035q02_connect,
0227     .disconnect = lb035q02_disconnect,
0228
0229     .enable     = lb035q02_enable,
0230     .disable    = lb035q02_disable,
0231
0232     .set_timings    = lb035q02_set_timings,
0233     .get_timings    = lb035q02_get_timings,
0234     .check_timings  = lb035q02_check_timings,
0235
0236     .get_resolution = omapdss_default_get_resolution,
0237 };
0238
0239 static int lb035q02_probe_of(struct spi_device *spi)
0240 {
0241     struct device_node *node = spi->dev.of_node;
0242     struct panel_drv_data *ddata = spi_get_drvdata(spi);
0243     struct omap_dss_device *in;
0244     struct gpio_desc *gpio;
0245
0246     gpio = devm_gpiod_get(&spi->dev, "enable", GPIOD_OUT_LOW);
0247     if (IS_ERR(gpio))
0248         return dev_err_probe(&spi->dev, PTR_ERR(gpio),
0249                      "failed to parse enable gpio\n");
0250
0251     ddata->enable_gpio = gpio;
0252
0253     ddata->backlight_gpio = -ENOENT;
0254
0255     in = omapdss_of_find_source_for_first_ep(node);
0256     if (IS_ERR(in)) {
0257         dev_err(&spi->dev, "failed to find video source\n");
0258         return PTR_ERR(in);
0259     }
0260
0261     ddata->in = in;
0262
0263     return 0;
0264 }
0265
0266 static int lb035q02_panel_spi_probe(struct spi_device *spi)
0267 {
0268     struct panel_drv_data *ddata;
0269     struct omap_dss_device *dssdev;
0270     int r;
0271
0272     if (!spi->dev.of_node)
0273         return -ENODEV;
0274
0275     ddata = devm_kzalloc(&spi->dev, sizeof(*ddata), GFP_KERNEL);
0276     if (ddata == NULL)
0277         return -ENOMEM;
0278
0279     spi_set_drvdata(spi, ddata);
0280
0281     ddata->spi = spi;
0282
0283     r = lb035q02_probe_of(spi);
0284     if (r)
0285         return r;
0286
0287     if (gpio_is_valid(ddata->backlight_gpio)) {
0288         r = devm_gpio_request_one(&spi->dev, ddata->backlight_gpio,
0289                 GPIOF_OUT_INIT_LOW, "panel backlight");
0290         if (r)
0291             goto err_gpio;
0292     }
0293
0294     ddata->videomode = lb035q02_timings;
0295
0296     dssdev = &ddata->dssdev;
0297     dssdev->dev = &spi->dev;
0298     dssdev->driver = &lb035q02_ops;
0299     dssdev->type = OMAP_DISPLAY_TYPE_DPI;
0300     dssdev->owner = THIS_MODULE;
0301     dssdev->panel.timings = ddata->videomode;
0302     dssdev->phy.dpi.data_lines = ddata->data_lines;
0303
0304     r = omapdss_register_display(dssdev);
0305     if (r) {
0306         dev_err(&spi->dev, "Failed to register panel\n");
0307         goto err_reg;
0308     }
0309
0310     return 0;
0311
0312 err_reg:
0313 err_gpio:
0314     omap_dss_put_device(ddata->in);
0315     return r;
0316 }
0317
0318 static void lb035q02_panel_spi_remove(struct spi_device *spi)
0319 {
0320     struct panel_drv_data *ddata = spi_get_drvdata(spi);
0321     struct omap_dss_device *dssdev = &ddata->dssdev;
0322     struct omap_dss_device *in = ddata->in;
0323
0324     omapdss_unregister_display(dssdev);
0325
0326     lb035q02_disable(dssdev);
0327     lb035q02_disconnect(dssdev);
0328
0329     omap_dss_put_device(in);
0330 }
0331
0332 static const struct of_device_id lb035q02_of_match[] = {
0333     { .compatible = "omapdss,lgphilips,lb035q02", },
0334     {},
0335 };
0336
0337 MODULE_DEVICE_TABLE(of, lb035q02_of_match);
0338
0339 static struct spi_driver lb035q02_spi_driver = {
0340     .probe      = lb035q02_panel_spi_probe,
0341     .remove     = lb035q02_panel_spi_remove,
0342     .driver     = {
0343         .name   = "panel_lgphilips_lb035q02",
0344         .of_match_table = lb035q02_of_match,
0345         .suppress_bind_attrs = true,
0346     },
0347 };
0348
0349 module_spi_driver(lb035q02_spi_driver);
0350
0351 MODULE_ALIAS("spi:lgphilips,lb035q02");
0352 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
0353 MODULE_DESCRIPTION("LG.Philips LB035Q02 LCD Panel driver");
0354 MODULE_LICENSE("GPL");