/* * LG.Philips LB035Q02 LCD Panel driver * * Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com/ * Author: Tomi Valkeinen * Based on a driver by: Steve Sakoman * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 as published by * the Free Software Foundation. */ #include #include #include #include #include #include #include "../dss/omapdss.h" static const struct videomode lb035q02_vm = { .hactive = 320, .vactive = 240, .pixelclock = 6500000, .hsync_len = 2, .hfront_porch = 20, .hback_porch = 68, .vsync_len = 2, .vfront_porch = 4, .vback_porch = 18, .flags = DISPLAY_FLAGS_HSYNC_LOW | DISPLAY_FLAGS_VSYNC_LOW, }; struct panel_drv_data { struct omap_dss_device dssdev; struct spi_device *spi; struct videomode vm; struct gpio_desc *enable_gpio; }; #define to_panel_data(p) container_of(p, struct panel_drv_data, dssdev) static int lb035q02_write_reg(struct spi_device *spi, u8 reg, u16 val) { struct spi_message msg; struct spi_transfer index_xfer = { .len = 3, .cs_change = 1, }; struct spi_transfer value_xfer = { .len = 3, }; u8 buffer[16]; spi_message_init(&msg); /* register index */ buffer[0] = 0x70; buffer[1] = 0x00; buffer[2] = reg & 0x7f; index_xfer.tx_buf = buffer; spi_message_add_tail(&index_xfer, &msg); /* register value */ buffer[4] = 0x72; buffer[5] = val >> 8; buffer[6] = val; value_xfer.tx_buf = buffer + 4; spi_message_add_tail(&value_xfer, &msg); return spi_sync(spi, &msg); } static void init_lb035q02_panel(struct spi_device *spi) { /* Init sequence from page 28 of the lb035q02 spec */ lb035q02_write_reg(spi, 0x01, 0x6300); lb035q02_write_reg(spi, 0x02, 0x0200); lb035q02_write_reg(spi, 0x03, 0x0177); lb035q02_write_reg(spi, 0x04, 0x04c7); lb035q02_write_reg(spi, 0x05, 0xffc0); lb035q02_write_reg(spi, 0x06, 0xe806); lb035q02_write_reg(spi, 0x0a, 0x4008); lb035q02_write_reg(spi, 0x0b, 0x0000); lb035q02_write_reg(spi, 0x0d, 0x0030); lb035q02_write_reg(spi, 0x0e, 0x2800); lb035q02_write_reg(spi, 0x0f, 0x0000); lb035q02_write_reg(spi, 0x16, 0x9f80); lb035q02_write_reg(spi, 0x17, 0x0a0f); lb035q02_write_reg(spi, 0x1e, 0x00c1); lb035q02_write_reg(spi, 0x30, 0x0300); lb035q02_write_reg(spi, 0x31, 0x0007); lb035q02_write_reg(spi, 0x32, 0x0000); lb035q02_write_reg(spi, 0x33, 0x0000); lb035q02_write_reg(spi, 0x34, 0x0707); lb035q02_write_reg(spi, 0x35, 0x0004); lb035q02_write_reg(spi, 0x36, 0x0302); lb035q02_write_reg(spi, 0x37, 0x0202); lb035q02_write_reg(spi, 0x3a, 0x0a0d); lb035q02_write_reg(spi, 0x3b, 0x0806); } static int lb035q02_connect(struct omap_dss_device *src, struct omap_dss_device *dst) { struct panel_drv_data *ddata = to_panel_data(dst); init_lb035q02_panel(ddata->spi); return 0; } static void lb035q02_disconnect(struct omap_dss_device *src, struct omap_dss_device *dst) { } static int lb035q02_enable(struct omap_dss_device *dssdev) { struct panel_drv_data *ddata = to_panel_data(dssdev); struct omap_dss_device *src = dssdev->src; int r; if (!omapdss_device_is_connected(dssdev)) return -ENODEV; if (omapdss_device_is_enabled(dssdev)) return 0; r = src->ops->enable(src); if (r) return r; if (ddata->enable_gpio) gpiod_set_value_cansleep(ddata->enable_gpio, 1); dssdev->state = OMAP_DSS_DISPLAY_ACTIVE; return 0; } static void lb035q02_disable(struct omap_dss_device *dssdev) { struct panel_drv_data *ddata = to_panel_data(dssdev); struct omap_dss_device *src = dssdev->src; if (!omapdss_device_is_enabled(dssdev)) return; if (ddata->enable_gpio) gpiod_set_value_cansleep(ddata->enable_gpio, 0); src->ops->disable(src); dssdev->state = OMAP_DSS_DISPLAY_DISABLED; } static void lb035q02_get_timings(struct omap_dss_device *dssdev, struct videomode *vm) { struct panel_drv_data *ddata = to_panel_data(dssdev); *vm = ddata->vm; } static const struct omap_dss_device_ops lb035q02_ops = { .connect = lb035q02_connect, .disconnect = lb035q02_disconnect, .enable = lb035q02_enable, .disable = lb035q02_disable, .get_timings = lb035q02_get_timings, }; static int lb035q02_probe_of(struct spi_device *spi) { struct panel_drv_data *ddata = dev_get_drvdata(&spi->dev); struct gpio_desc *gpio; gpio = devm_gpiod_get(&spi->dev, "enable", GPIOD_OUT_LOW); if (IS_ERR(gpio)) { dev_err(&spi->dev, "failed to parse enable gpio\n"); return PTR_ERR(gpio); } ddata->enable_gpio = gpio; return 0; } static int lb035q02_panel_spi_probe(struct spi_device *spi) { struct panel_drv_data *ddata; struct omap_dss_device *dssdev; int r; ddata = devm_kzalloc(&spi->dev, sizeof(*ddata), GFP_KERNEL); if (ddata == NULL) return -ENOMEM; dev_set_drvdata(&spi->dev, ddata); ddata->spi = spi; r = lb035q02_probe_of(spi); if (r) return r; ddata->vm = lb035q02_vm; dssdev = &ddata->dssdev; dssdev->dev = &spi->dev; dssdev->ops = &lb035q02_ops; dssdev->type = OMAP_DISPLAY_TYPE_DPI; dssdev->owner = THIS_MODULE; dssdev->of_ports = BIT(0); /* * Note: According to the panel documentation: * DE is active LOW * DATA needs to be driven on the FALLING edge */ dssdev->bus_flags = DRM_BUS_FLAG_DE_HIGH | DRM_BUS_FLAG_SYNC_NEGEDGE | DRM_BUS_FLAG_PIXDATA_POSEDGE; omapdss_display_init(dssdev); omapdss_device_register(dssdev); return 0; } static int lb035q02_panel_spi_remove(struct spi_device *spi) { struct panel_drv_data *ddata = dev_get_drvdata(&spi->dev); struct omap_dss_device *dssdev = &ddata->dssdev; omapdss_device_unregister(dssdev); lb035q02_disable(dssdev); return 0; } static const struct of_device_id lb035q02_of_match[] = { { .compatible = "omapdss,lgphilips,lb035q02", }, {}, }; MODULE_DEVICE_TABLE(of, lb035q02_of_match); static struct spi_driver lb035q02_spi_driver = { .probe = lb035q02_panel_spi_probe, .remove = lb035q02_panel_spi_remove, .driver = { .name = "panel_lgphilips_lb035q02", .of_match_table = lb035q02_of_match, .suppress_bind_attrs = true, }, }; module_spi_driver(lb035q02_spi_driver); MODULE_ALIAS("spi:lgphilips,lb035q02"); MODULE_AUTHOR("Tomi Valkeinen "); MODULE_DESCRIPTION("LG.Philips LB035Q02 LCD Panel driver"); MODULE_LICENSE("GPL");