--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Sharp LS037V7DW01 LCD Panel Driver
+ *
+ * Copyright (C) 2019 Texas Instruments Incorporated
+ *
+ * Based on the omapdrm-specific panel-sharp-ls037v7dw01 driver
+ *
+ * Copyright (C) 2013 Texas Instruments Incorporated
+ * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
+ */
+
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/consumer.h>
+
+#include <drm/drm_connector.h>
+#include <drm/drm_modes.h>
+#include <drm/drm_panel.h>
+
+struct ls037v7dw01_panel {
+ struct drm_panel panel;
+ struct platform_device *pdev;
+
+ struct regulator *vdd;
+ struct gpio_desc *resb_gpio; /* low = reset active min 20 us */
+ struct gpio_desc *ini_gpio; /* high = power on */
+ struct gpio_desc *mo_gpio; /* low = 480x640, high = 240x320 */
+ struct gpio_desc *lr_gpio; /* high = conventional horizontal scanning */
+ struct gpio_desc *ud_gpio; /* high = conventional vertical scanning */
+};
+
+#define to_ls037v7dw01_device(p) \
+ container_of(p, struct ls037v7dw01_panel, panel)
+
+static int ls037v7dw01_disable(struct drm_panel *panel)
+{
+ struct ls037v7dw01_panel *lcd = to_ls037v7dw01_device(panel);
+
+ gpiod_set_value_cansleep(lcd->ini_gpio, 0);
+ gpiod_set_value_cansleep(lcd->resb_gpio, 0);
+
+ /* Wait at least 5 vsyncs after disabling the LCD. */
+ msleep(100);
+
+ return 0;
+}
+
+static int ls037v7dw01_unprepare(struct drm_panel *panel)
+{
+ struct ls037v7dw01_panel *lcd = to_ls037v7dw01_device(panel);
+
+ regulator_disable(lcd->vdd);
+ return 0;
+}
+
+static int ls037v7dw01_prepare(struct drm_panel *panel)
+{
+ struct ls037v7dw01_panel *lcd = to_ls037v7dw01_device(panel);
+ int ret;
+
+ ret = regulator_enable(lcd->vdd);
+ if (ret < 0)
+ dev_err(&lcd->pdev->dev, "%s: failed to enable regulator\n",
+ __func__);
+
+ return ret;
+}
+
+static int ls037v7dw01_enable(struct drm_panel *panel)
+{
+ struct ls037v7dw01_panel *lcd = to_ls037v7dw01_device(panel);
+
+ /* Wait couple of vsyncs before enabling the LCD. */
+ msleep(50);
+
+ gpiod_set_value_cansleep(lcd->resb_gpio, 1);
+ gpiod_set_value_cansleep(lcd->ini_gpio, 1);
+
+ return 0;
+}
+
+static const struct drm_display_mode ls037v7dw01_mode = {
+ .clock = 19200,
+ .hdisplay = 480,
+ .hsync_start = 480 + 1,
+ .hsync_end = 480 + 1 + 2,
+ .htotal = 480 + 1 + 2 + 28,
+ .vdisplay = 640,
+ .vsync_start = 640 + 1,
+ .vsync_end = 640 + 1 + 1,
+ .vtotal = 640 + 1 + 1 + 1,
+ .vrefresh = 58,
+ .type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
+ .flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,
+ .width_mm = 56,
+ .height_mm = 75,
+};
+
+static int ls037v7dw01_get_modes(struct drm_panel *panel)
+{
+ struct drm_connector *connector = panel->connector;
+ struct drm_display_mode *mode;
+
+ mode = drm_mode_duplicate(panel->drm, &ls037v7dw01_mode);
+ if (!mode)
+ return -ENOMEM;
+
+ drm_mode_set_name(mode);
+ drm_mode_probed_add(connector, mode);
+
+ connector->display_info.width_mm = ls037v7dw01_mode.width_mm;
+ connector->display_info.height_mm = ls037v7dw01_mode.height_mm;
+ /*
+ * FIXME: According to the datasheet pixel data is sampled on the
+ * rising edge of the clock, but the code running on the SDP3430
+ * indicates sampling on the negative edge. This should be tested on a
+ * real device.
+ */
+ connector->display_info.bus_flags = DRM_BUS_FLAG_DE_HIGH
+ | DRM_BUS_FLAG_SYNC_SAMPLE_POSEDGE
+ | DRM_BUS_FLAG_PIXDATA_SAMPLE_NEGEDGE;
+
+ return 1;
+}
+
+static const struct drm_panel_funcs ls037v7dw01_funcs = {
+ .disable = ls037v7dw01_disable,
+ .unprepare = ls037v7dw01_unprepare,
+ .prepare = ls037v7dw01_prepare,
+ .enable = ls037v7dw01_enable,
+ .get_modes = ls037v7dw01_get_modes,
+};
+
+static int ls037v7dw01_probe(struct platform_device *pdev)
+{
+ struct ls037v7dw01_panel *lcd;
+
+ lcd = devm_kzalloc(&pdev->dev, sizeof(*lcd), GFP_KERNEL);
+ if (lcd == NULL)
+ return -ENOMEM;
+
+ platform_set_drvdata(pdev, lcd);
+ lcd->pdev = pdev;
+
+ lcd->vdd = devm_regulator_get(&pdev->dev, "envdd");
+ if (IS_ERR(lcd->vdd)) {
+ dev_err(&pdev->dev, "failed to get regulator\n");
+ return PTR_ERR(lcd->vdd);
+ }
+
+ lcd->ini_gpio = devm_gpiod_get(&pdev->dev, "enable", GPIOD_OUT_LOW);
+ if (IS_ERR(lcd->ini_gpio)) {
+ dev_err(&pdev->dev, "failed to get enable gpio\n");
+ return PTR_ERR(lcd->ini_gpio);
+ }
+
+ lcd->resb_gpio = devm_gpiod_get(&pdev->dev, "reset", GPIOD_OUT_LOW);
+ if (IS_ERR(lcd->resb_gpio)) {
+ dev_err(&pdev->dev, "failed to get reset gpio\n");
+ return PTR_ERR(lcd->resb_gpio);
+ }
+
+ lcd->mo_gpio = devm_gpiod_get_index(&pdev->dev, "mode", 0,
+ GPIOD_OUT_LOW);
+ if (IS_ERR(lcd->mo_gpio)) {
+ dev_err(&pdev->dev, "failed to get mode[0] gpio\n");
+ return PTR_ERR(lcd->mo_gpio);
+ }
+
+ lcd->lr_gpio = devm_gpiod_get_index(&pdev->dev, "mode", 1,
+ GPIOD_OUT_LOW);
+ if (IS_ERR(lcd->lr_gpio)) {
+ dev_err(&pdev->dev, "failed to get mode[1] gpio\n");
+ return PTR_ERR(lcd->lr_gpio);
+ }
+
+ lcd->ud_gpio = devm_gpiod_get_index(&pdev->dev, "mode", 2,
+ GPIOD_OUT_LOW);
+ if (IS_ERR(lcd->ud_gpio)) {
+ dev_err(&pdev->dev, "failed to get mode[2] gpio\n");
+ return PTR_ERR(lcd->ud_gpio);
+ }
+
+ drm_panel_init(&lcd->panel);
+ lcd->panel.dev = &pdev->dev;
+ lcd->panel.funcs = &ls037v7dw01_funcs;
+
+ return drm_panel_add(&lcd->panel);
+}
+
+static int ls037v7dw01_remove(struct platform_device *pdev)
+{
+ struct ls037v7dw01_panel *lcd = platform_get_drvdata(pdev);
+
+ drm_panel_remove(&lcd->panel);
+ drm_panel_disable(&lcd->panel);
+ drm_panel_unprepare(&lcd->panel);
+
+ return 0;
+}
+
+static const struct of_device_id ls037v7dw01_of_match[] = {
+ { .compatible = "sharp,ls037v7dw01", },
+ { /* sentinel */ },
+};
+
+MODULE_DEVICE_TABLE(of, ls037v7dw01_of_match);
+
+static struct platform_driver ls037v7dw01_driver = {
+ .probe = ls037v7dw01_probe,
+ .remove = ls037v7dw01_remove,
+ .driver = {
+ .name = "panel-sharp-ls037v7dw01",
+ .of_match_table = ls037v7dw01_of_match,
+ },
+};
+
+module_platform_driver(ls037v7dw01_driver);
+
+MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
+MODULE_DESCRIPTION("Sharp LS037V7DW01 Panel Driver");
+MODULE_LICENSE("GPL");
projects / platform / kernel / linux-rpi.git / commitdiff