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 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 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 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 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 }; 101 102 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 }; 136 137 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 } 191 192 static int 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 return 0; 201 } 202 203 static const struct of_device_id ls037v7dw01_of_match[] = { 204 { .compatible = "sharp,ls037v7dw01", }, 205 { /* sentinel */ }, 206 }; 207 208 MODULE_DEVICE_TABLE(of, ls037v7dw01_of_match); 209 210 static struct platform_driver ls037v7dw01_driver = { 211 .probe = ls037v7dw01_probe, 212 .remove = ls037v7dw01_remove, 213 .driver = { 214 .name = "panel-sharp-ls037v7dw01", 215 .of_match_table = ls037v7dw01_of_match, 216 }, 217 }; 218 219 module_platform_driver(ls037v7dw01_driver); 220 221 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>"); 222 MODULE_DESCRIPTION("Sharp LS037V7DW01 Panel Driver"); 223 MODULE_LICENSE("GPL"); 224