| /* |
| * LG.Philips LB035Q02 LCD Panel driver |
| * |
| * Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com/ |
| * Author: Tomi Valkeinen <tomi.valkeinen@ti.com> |
| * Based on a driver by: Steve Sakoman <steve@sakoman.com> |
| * |
| * 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 <linux/module.h> |
| #include <linux/delay.h> |
| #include <linux/spi/spi.h> |
| #include <linux/mutex.h> |
| #include <linux/gpio.h> |
| #include <linux/gpio/consumer.h> |
| |
| #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 <tomi.valkeinen@ti.com>"); |
| MODULE_DESCRIPTION("LG.Philips LB035Q02 LCD Panel driver"); |
| MODULE_LICENSE("GPL"); |