1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Sharp LS037V7DW01 LCD Panel Driver
4 *
5 * Copyright (C) 2019 Texas Instruments Incorporated
6 *
7 * Based on the omapdrm-specific panel-sharp-ls037v7dw01 driver
8 *
9 * Copyright (C) 2013 Texas Instruments Incorporated
10 * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
11 */
12
13 #include <linux/delay.h>
14 #include <linux/gpio/consumer.h>
15 #include <linux/module.h>
16 #include <linux/of.h>
17 #include <linux/platform_device.h>
18 #include <linux/regulator/consumer.h>
19
20 #include <drm/drm_connector.h>
21 #include <drm/drm_modes.h>
22 #include <drm/drm_panel.h>
23
24 struct ls037v7dw01_panel {
25 struct drm_panel panel;
26 struct platform_device *pdev;
27
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 */
34 };
35
36 #define to_ls037v7dw01_device(p) \
37 container_of(p, struct ls037v7dw01_panel, panel)
38
ls037v7dw01_disable(struct drm_panel * panel)39 static int ls037v7dw01_disable(struct drm_panel *panel)
40 {
41 struct ls037v7dw01_panel *lcd = to_ls037v7dw01_device(panel);
42
43 gpiod_set_value_cansleep(lcd->ini_gpio, 0);
44 gpiod_set_value_cansleep(lcd->resb_gpio, 0);
45
46 /* Wait at least 5 vsyncs after disabling the LCD. */
47 msleep(100);
48
49 return 0;
50 }
51
ls037v7dw01_unprepare(struct drm_panel * panel)52 static int ls037v7dw01_unprepare(struct drm_panel *panel)
53 {
54 struct ls037v7dw01_panel *lcd = to_ls037v7dw01_device(panel);
55
56 regulator_disable(lcd->vdd);
57 return 0;
58 }
59
ls037v7dw01_prepare(struct drm_panel * panel)60 static int ls037v7dw01_prepare(struct drm_panel *panel)
61 {
62 struct ls037v7dw01_panel *lcd = to_ls037v7dw01_device(panel);
63 int ret;
64
65 ret = regulator_enable(lcd->vdd);
66 if (ret < 0)
67 dev_err(&lcd->pdev->dev, "%s: failed to enable regulator\n",
68 __func__);
69
70 return ret;
71 }
72
ls037v7dw01_enable(struct drm_panel * panel)73 static int ls037v7dw01_enable(struct drm_panel *panel)
74 {
75 struct ls037v7dw01_panel *lcd = to_ls037v7dw01_device(panel);
76
77 /* Wait couple of vsyncs before enabling the LCD. */
78 msleep(50);
79
80 gpiod_set_value_cansleep(lcd->resb_gpio, 1);
81 gpiod_set_value_cansleep(lcd->ini_gpio, 1);
82
83 return 0;
84 }
85
86 static const struct drm_display_mode ls037v7dw01_mode = {
87 .clock = 19200,
88 .hdisplay = 480,
89 .hsync_start = 480 + 1,
90 .hsync_end = 480 + 1 + 2,
91 .htotal = 480 + 1 + 2 + 28,
92 .vdisplay = 640,
93 .vsync_start = 640 + 1,
94 .vsync_end = 640 + 1 + 1,
95 .vtotal = 640 + 1 + 1 + 1,
96 .type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
97 .flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,
98 .width_mm = 56,
99 .height_mm = 75,
100 };
101
ls037v7dw01_get_modes(struct drm_panel * panel,struct drm_connector * connector)102 static int ls037v7dw01_get_modes(struct drm_panel *panel,
103 struct drm_connector *connector)
104 {
105 struct drm_display_mode *mode;
106
107 mode = drm_mode_duplicate(connector->dev, &ls037v7dw01_mode);
108 if (!mode)
109 return -ENOMEM;
110
111 drm_mode_set_name(mode);
112 drm_mode_probed_add(connector, mode);
113
114 connector->display_info.width_mm = ls037v7dw01_mode.width_mm;
115 connector->display_info.height_mm = ls037v7dw01_mode.height_mm;
116 /*
117 * FIXME: According to the datasheet pixel data is sampled on the
118 * rising edge of the clock, but the code running on the SDP3430
119 * indicates sampling on the negative edge. This should be tested on a
120 * real device.
121 */
122 connector->display_info.bus_flags = DRM_BUS_FLAG_DE_HIGH
123 | DRM_BUS_FLAG_SYNC_SAMPLE_POSEDGE
124 | DRM_BUS_FLAG_PIXDATA_SAMPLE_NEGEDGE;
125
126 return 1;
127 }
128
129 static const struct drm_panel_funcs ls037v7dw01_funcs = {
130 .disable = ls037v7dw01_disable,
131 .unprepare = ls037v7dw01_unprepare,
132 .prepare = ls037v7dw01_prepare,
133 .enable = ls037v7dw01_enable,
134 .get_modes = ls037v7dw01_get_modes,
135 };
136
ls037v7dw01_probe(struct platform_device * pdev)137 static int ls037v7dw01_probe(struct platform_device *pdev)
138 {
139 struct ls037v7dw01_panel *lcd;
140
141 lcd = devm_kzalloc(&pdev->dev, sizeof(*lcd), GFP_KERNEL);
142 if (!lcd)
143 return -ENOMEM;
144
145 platform_set_drvdata(pdev, lcd);
146 lcd->pdev = pdev;
147
148 lcd->vdd = devm_regulator_get(&pdev->dev, "envdd");
149 if (IS_ERR(lcd->vdd))
150 return dev_err_probe(&pdev->dev, PTR_ERR(lcd->vdd),
151 "failed to get regulator\n");
152
153 lcd->ini_gpio = devm_gpiod_get(&pdev->dev, "enable", GPIOD_OUT_LOW);
154 if (IS_ERR(lcd->ini_gpio))
155 return dev_err_probe(&pdev->dev, PTR_ERR(lcd->ini_gpio),
156 "failed to get enable gpio\n");
157
158 lcd->resb_gpio = devm_gpiod_get(&pdev->dev, "reset", GPIOD_OUT_LOW);
159 if (IS_ERR(lcd->resb_gpio))
160 return dev_err_probe(&pdev->dev, PTR_ERR(lcd->resb_gpio),
161 "failed to get reset gpio\n");
162
163 lcd->mo_gpio = devm_gpiod_get_index(&pdev->dev, "mode", 0,
164 GPIOD_OUT_LOW);
165 if (IS_ERR(lcd->mo_gpio)) {
166 dev_err(&pdev->dev, "failed to get mode[0] gpio\n");
167 return PTR_ERR(lcd->mo_gpio);
168 }
169
170 lcd->lr_gpio = devm_gpiod_get_index(&pdev->dev, "mode", 1,
171 GPIOD_OUT_LOW);
172 if (IS_ERR(lcd->lr_gpio)) {
173 dev_err(&pdev->dev, "failed to get mode[1] gpio\n");
174 return PTR_ERR(lcd->lr_gpio);
175 }
176
177 lcd->ud_gpio = devm_gpiod_get_index(&pdev->dev, "mode", 2,
178 GPIOD_OUT_LOW);
179 if (IS_ERR(lcd->ud_gpio)) {
180 dev_err(&pdev->dev, "failed to get mode[2] gpio\n");
181 return PTR_ERR(lcd->ud_gpio);
182 }
183
184 drm_panel_init(&lcd->panel, &pdev->dev, &ls037v7dw01_funcs,
185 DRM_MODE_CONNECTOR_DPI);
186
187 drm_panel_add(&lcd->panel);
188
189 return 0;
190 }
191
ls037v7dw01_remove(struct platform_device * pdev)192 static void ls037v7dw01_remove(struct platform_device *pdev)
193 {
194 struct ls037v7dw01_panel *lcd = platform_get_drvdata(pdev);
195
196 drm_panel_remove(&lcd->panel);
197 drm_panel_disable(&lcd->panel);
198 drm_panel_unprepare(&lcd->panel);
199 }
200
201 static const struct of_device_id ls037v7dw01_of_match[] = {
202 { .compatible = "sharp,ls037v7dw01", },
203 { /* sentinel */ },
204 };
205
206 MODULE_DEVICE_TABLE(of, ls037v7dw01_of_match);
207
208 static struct platform_driver ls037v7dw01_driver = {
209 .probe = ls037v7dw01_probe,
210 .remove_new = ls037v7dw01_remove,
211 .driver = {
212 .name = "panel-sharp-ls037v7dw01",
213 .of_match_table = ls037v7dw01_of_match,
214 },
215 };
216
217 module_platform_driver(ls037v7dw01_driver);
218
219 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
220 MODULE_DESCRIPTION("Sharp LS037V7DW01 Panel Driver");
221 MODULE_LICENSE("GPL");
222