1 // SPDX-License-Identifier: GPL-2.0
3 * Sharp LS037V7DW01 LCD Panel Driver
5 * Copyright (C) 2019 Texas Instruments Incorporated
7 * Based on the omapdrm-specific panel-sharp-ls037v7dw01 driver
9 * Copyright (C) 2013 Texas Instruments Incorporated
10 * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
13 #include <linux/delay.h>
14 #include <linux/gpio/consumer.h>
15 #include <linux/module.h>
17 #include <linux/platform_device.h>
18 #include <linux/regulator/consumer.h>
20 #include <drm/drm_connector.h>
21 #include <drm/drm_modes.h>
22 #include <drm/drm_panel.h>
24 struct ls037v7dw01_panel {
25 struct drm_panel panel;
26 struct platform_device *pdev;
28 struct regulator *vdd;
29 struct gpio_desc *resb_gpio; /* low = reset active min 20 us */
30 struct gpio_desc *ini_gpio; /* high = power on */
31 struct gpio_desc *mo_gpio; /* low = 480x640, high = 240x320 */
32 struct gpio_desc *lr_gpio; /* high = conventional horizontal scanning */
33 struct gpio_desc *ud_gpio; /* high = conventional vertical scanning */
36 #define to_ls037v7dw01_device(p) \
37 container_of(p, struct ls037v7dw01_panel, panel)
39 static int ls037v7dw01_disable(struct drm_panel *panel)
41 struct ls037v7dw01_panel *lcd = to_ls037v7dw01_device(panel);
43 gpiod_set_value_cansleep(lcd->ini_gpio, 0);
44 gpiod_set_value_cansleep(lcd->resb_gpio, 0);
46 /* Wait at least 5 vsyncs after disabling the LCD. */
52 static int ls037v7dw01_unprepare(struct drm_panel *panel)
54 struct ls037v7dw01_panel *lcd = to_ls037v7dw01_device(panel);
56 regulator_disable(lcd->vdd);
60 static int ls037v7dw01_prepare(struct drm_panel *panel)
62 struct ls037v7dw01_panel *lcd = to_ls037v7dw01_device(panel);
65 ret = regulator_enable(lcd->vdd);
67 dev_err(&lcd->pdev->dev, "%s: failed to enable regulator\n",
73 static int ls037v7dw01_enable(struct drm_panel *panel)
75 struct ls037v7dw01_panel *lcd = to_ls037v7dw01_device(panel);
77 /* Wait couple of vsyncs before enabling the LCD. */
80 gpiod_set_value_cansleep(lcd->resb_gpio, 1);
81 gpiod_set_value_cansleep(lcd->ini_gpio, 1);
86 static const struct drm_display_mode ls037v7dw01_mode = {
89 .hsync_start = 480 + 1,
90 .hsync_end = 480 + 1 + 2,
91 .htotal = 480 + 1 + 2 + 28,
93 .vsync_start = 640 + 1,
94 .vsync_end = 640 + 1 + 1,
95 .vtotal = 640 + 1 + 1 + 1,
97 .type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
98 .flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,
103 static int ls037v7dw01_get_modes(struct drm_panel *panel,
104 struct drm_connector *connector)
106 struct drm_display_mode *mode;
108 mode = drm_mode_duplicate(connector->dev, &ls037v7dw01_mode);
112 drm_mode_set_name(mode);
113 drm_mode_probed_add(connector, mode);
115 connector->display_info.width_mm = ls037v7dw01_mode.width_mm;
116 connector->display_info.height_mm = ls037v7dw01_mode.height_mm;
118 * FIXME: According to the datasheet pixel data is sampled on the
119 * rising edge of the clock, but the code running on the SDP3430
120 * indicates sampling on the negative edge. This should be tested on a
123 connector->display_info.bus_flags = DRM_BUS_FLAG_DE_HIGH
124 | DRM_BUS_FLAG_SYNC_SAMPLE_POSEDGE
125 | DRM_BUS_FLAG_PIXDATA_SAMPLE_NEGEDGE;
130 static const struct drm_panel_funcs ls037v7dw01_funcs = {
131 .disable = ls037v7dw01_disable,
132 .unprepare = ls037v7dw01_unprepare,
133 .prepare = ls037v7dw01_prepare,
134 .enable = ls037v7dw01_enable,
135 .get_modes = ls037v7dw01_get_modes,
138 static int ls037v7dw01_probe(struct platform_device *pdev)
140 struct ls037v7dw01_panel *lcd;
142 lcd = devm_kzalloc(&pdev->dev, sizeof(*lcd), GFP_KERNEL);
146 platform_set_drvdata(pdev, lcd);
149 lcd->vdd = devm_regulator_get(&pdev->dev, "envdd");
150 if (IS_ERR(lcd->vdd)) {
151 dev_err(&pdev->dev, "failed to get regulator\n");
152 return PTR_ERR(lcd->vdd);
155 lcd->ini_gpio = devm_gpiod_get(&pdev->dev, "enable", GPIOD_OUT_LOW);
156 if (IS_ERR(lcd->ini_gpio)) {
157 dev_err(&pdev->dev, "failed to get enable gpio\n");
158 return PTR_ERR(lcd->ini_gpio);
161 lcd->resb_gpio = devm_gpiod_get(&pdev->dev, "reset", GPIOD_OUT_LOW);
162 if (IS_ERR(lcd->resb_gpio)) {
163 dev_err(&pdev->dev, "failed to get reset gpio\n");
164 return PTR_ERR(lcd->resb_gpio);
167 lcd->mo_gpio = devm_gpiod_get_index(&pdev->dev, "mode", 0,
169 if (IS_ERR(lcd->mo_gpio)) {
170 dev_err(&pdev->dev, "failed to get mode[0] gpio\n");
171 return PTR_ERR(lcd->mo_gpio);
174 lcd->lr_gpio = devm_gpiod_get_index(&pdev->dev, "mode", 1,
176 if (IS_ERR(lcd->lr_gpio)) {
177 dev_err(&pdev->dev, "failed to get mode[1] gpio\n");
178 return PTR_ERR(lcd->lr_gpio);
181 lcd->ud_gpio = devm_gpiod_get_index(&pdev->dev, "mode", 2,
183 if (IS_ERR(lcd->ud_gpio)) {
184 dev_err(&pdev->dev, "failed to get mode[2] gpio\n");
185 return PTR_ERR(lcd->ud_gpio);
188 drm_panel_init(&lcd->panel, &pdev->dev, &ls037v7dw01_funcs,
189 DRM_MODE_CONNECTOR_DPI);
191 return drm_panel_add(&lcd->panel);
194 static int ls037v7dw01_remove(struct platform_device *pdev)
196 struct ls037v7dw01_panel *lcd = platform_get_drvdata(pdev);
198 drm_panel_remove(&lcd->panel);
199 drm_panel_disable(&lcd->panel);
200 drm_panel_unprepare(&lcd->panel);
205 static const struct of_device_id ls037v7dw01_of_match[] = {
206 { .compatible = "sharp,ls037v7dw01", },
210 MODULE_DEVICE_TABLE(of, ls037v7dw01_of_match);
212 static struct platform_driver ls037v7dw01_driver = {
213 .probe = ls037v7dw01_probe,
214 .remove = ls037v7dw01_remove,
216 .name = "panel-sharp-ls037v7dw01",
217 .of_match_table = ls037v7dw01_of_match,
221 module_platform_driver(ls037v7dw01_driver);
223 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
224 MODULE_DESCRIPTION("Sharp LS037V7DW01 Panel Driver");
225 MODULE_LICENSE("GPL");