--- /dev/null
+/*
+ * LG.Philips LB035Q02 LCD Panel driver
+ *
+ * Copyright (C) 2013 Texas Instruments
+ * 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 <video/omapdss.h>
+#include <video/omap-panel-data.h>
+
+static struct omap_video_timings lb035q02_timings = {
+ .x_res = 320,
+ .y_res = 240,
+
+ .pixelclock = 6500000,
+
+ .hsw = 2,
+ .hfp = 20,
+ .hbp = 68,
+
+ .vsw = 2,
+ .vfp = 4,
+ .vbp = 18,
+
+ .vsync_level = OMAPDSS_SIG_ACTIVE_LOW,
+ .hsync_level = OMAPDSS_SIG_ACTIVE_LOW,
+ .data_pclk_edge = OMAPDSS_DRIVE_SIG_RISING_EDGE,
+ .de_level = OMAPDSS_SIG_ACTIVE_HIGH,
+ .sync_pclk_edge = OMAPDSS_DRIVE_SIG_FALLING_EDGE,
+};
+
+struct panel_drv_data {
+ struct omap_dss_device dssdev;
+ struct omap_dss_device *in;
+
+ struct spi_device *spi;
+
+ int data_lines;
+
+ struct omap_video_timings videomode;
+
+ /* used for non-DT boot, to be removed */
+ int backlight_gpio;
+
+ 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 *dssdev)
+{
+ struct panel_drv_data *ddata = to_panel_data(dssdev);
+ struct omap_dss_device *in = ddata->in;
+ int r;
+
+ if (omapdss_device_is_connected(dssdev))
+ return 0;
+
+ r = in->ops.dpi->connect(in, dssdev);
+ if (r)
+ return r;
+
+ init_lb035q02_panel(ddata->spi);
+
+ return 0;
+}
+
+static void lb035q02_disconnect(struct omap_dss_device *dssdev)
+{
+ struct panel_drv_data *ddata = to_panel_data(dssdev);
+ struct omap_dss_device *in = ddata->in;
+
+ if (!omapdss_device_is_connected(dssdev))
+ return;
+
+ in->ops.dpi->disconnect(in, dssdev);
+}
+
+static int lb035q02_enable(struct omap_dss_device *dssdev)
+{
+ struct panel_drv_data *ddata = to_panel_data(dssdev);
+ struct omap_dss_device *in = ddata->in;
+ int r;
+
+ if (!omapdss_device_is_connected(dssdev))
+ return -ENODEV;
+
+ if (omapdss_device_is_enabled(dssdev))
+ return 0;
+
+ if (ddata->data_lines)
+ in->ops.dpi->set_data_lines(in, ddata->data_lines);
+ in->ops.dpi->set_timings(in, &ddata->videomode);
+
+ r = in->ops.dpi->enable(in);
+ if (r)
+ return r;
+
+ if (ddata->enable_gpio)
+ gpiod_set_value_cansleep(ddata->enable_gpio, 1);
+
+ if (gpio_is_valid(ddata->backlight_gpio))
+ gpio_set_value_cansleep(ddata->backlight_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 *in = ddata->in;
+
+ if (!omapdss_device_is_enabled(dssdev))
+ return;
+
+ if (ddata->enable_gpio)
+ gpiod_set_value_cansleep(ddata->enable_gpio, 0);
+
+ if (gpio_is_valid(ddata->backlight_gpio))
+ gpio_set_value_cansleep(ddata->backlight_gpio, 0);
+
+ in->ops.dpi->disable(in);
+
+ dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
+}
+
+static void lb035q02_set_timings(struct omap_dss_device *dssdev,
+ struct omap_video_timings *timings)
+{
+ struct panel_drv_data *ddata = to_panel_data(dssdev);
+ struct omap_dss_device *in = ddata->in;
+
+ ddata->videomode = *timings;
+ dssdev->panel.timings = *timings;
+
+ in->ops.dpi->set_timings(in, timings);
+}
+
+static void lb035q02_get_timings(struct omap_dss_device *dssdev,
+ struct omap_video_timings *timings)
+{
+ struct panel_drv_data *ddata = to_panel_data(dssdev);
+
+ *timings = ddata->videomode;
+}
+
+static int lb035q02_check_timings(struct omap_dss_device *dssdev,
+ struct omap_video_timings *timings)
+{
+ struct panel_drv_data *ddata = to_panel_data(dssdev);
+ struct omap_dss_device *in = ddata->in;
+
+ return in->ops.dpi->check_timings(in, timings);
+}
+
+static struct omap_dss_driver lb035q02_ops = {
+ .connect = lb035q02_connect,
+ .disconnect = lb035q02_disconnect,
+
+ .enable = lb035q02_enable,
+ .disable = lb035q02_disable,
+
+ .set_timings = lb035q02_set_timings,
+ .get_timings = lb035q02_get_timings,
+ .check_timings = lb035q02_check_timings,
+
+ .get_resolution = omapdss_default_get_resolution,
+};
+
+static int lb035q02_probe_pdata(struct spi_device *spi)
+{
+ const struct panel_lb035q02_platform_data *pdata;
+ struct panel_drv_data *ddata = dev_get_drvdata(&spi->dev);
+ struct omap_dss_device *dssdev, *in;
+ int r;
+
+ pdata = dev_get_platdata(&spi->dev);
+
+ in = omap_dss_find_output(pdata->source);
+ if (in == NULL) {
+ dev_err(&spi->dev, "failed to find video source '%s'\n",
+ pdata->source);
+ return -EPROBE_DEFER;
+ }
+
+ ddata->in = in;
+
+ ddata->data_lines = pdata->data_lines;
+
+ dssdev = &ddata->dssdev;
+ dssdev->name = pdata->name;
+
+ r = devm_gpio_request_one(&spi->dev, pdata->enable_gpio,
+ GPIOF_OUT_INIT_LOW, "panel enable");
+ if (r)
+ goto err_gpio;
+
+ ddata->enable_gpio = gpio_to_desc(pdata->enable_gpio);
+
+ ddata->backlight_gpio = pdata->backlight_gpio;
+
+ return 0;
+err_gpio:
+ omap_dss_put_device(ddata->in);
+ return r;
+}
+
+static int lb035q02_probe_of(struct spi_device *spi)
+{
+ struct device_node *node = spi->dev.of_node;
+ struct panel_drv_data *ddata = dev_get_drvdata(&spi->dev);
+ struct omap_dss_device *in;
+ struct gpio_desc *gpio;
+
+ gpio = devm_gpiod_get(&spi->dev, "enable");
+ if (IS_ERR(gpio)) {
+ dev_err(&spi->dev, "failed to parse enable gpio\n");
+ return PTR_ERR(gpio);
+ } else {
+ gpiod_direction_output(gpio, 0);
+ ddata->enable_gpio = gpio;
+ }
+
+ ddata->backlight_gpio = -ENOENT;
+
+ in = omapdss_of_find_source_for_first_ep(node);
+ if (IS_ERR(in)) {
+ dev_err(&spi->dev, "failed to find video source\n");
+ return PTR_ERR(in);
+ }
+
+ ddata->in = in;
+
+ 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;
+
+ if (dev_get_platdata(&spi->dev)) {
+ r = lb035q02_probe_pdata(spi);
+ if (r)
+ return r;
+ } else if (spi->dev.of_node) {
+ r = lb035q02_probe_of(spi);
+ if (r)
+ return r;
+ } else {
+ return -ENODEV;
+ }
+
+ if (gpio_is_valid(ddata->backlight_gpio)) {
+ r = devm_gpio_request_one(&spi->dev, ddata->backlight_gpio,
+ GPIOF_OUT_INIT_LOW, "panel backlight");
+ if (r)
+ goto err_gpio;
+ }
+
+ ddata->videomode = lb035q02_timings;
+
+ dssdev = &ddata->dssdev;
+ dssdev->dev = &spi->dev;
+ dssdev->driver = &lb035q02_ops;
+ dssdev->type = OMAP_DISPLAY_TYPE_DPI;
+ dssdev->owner = THIS_MODULE;
+ dssdev->panel.timings = ddata->videomode;
+ dssdev->phy.dpi.data_lines = ddata->data_lines;
+
+ r = omapdss_register_display(dssdev);
+ if (r) {
+ dev_err(&spi->dev, "Failed to register panel\n");
+ goto err_reg;
+ }
+
+ return 0;
+
+err_reg:
+err_gpio:
+ omap_dss_put_device(ddata->in);
+ return r;
+}
+
+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;
+ struct omap_dss_device *in = ddata->in;
+
+ omapdss_unregister_display(dssdev);
+
+ lb035q02_disable(dssdev);
+ lb035q02_disconnect(dssdev);
+
+ omap_dss_put_device(in);
+
+ 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",
+ .owner = THIS_MODULE,
+ .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");
Code Review / kvmfornfv.git / blobdiff