1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * LCD panel driver for Sharp LS037V7DW01 4 * 5 * Copyright (C) 2013 Texas Instruments 6 * Author: Tomi Valkeinen <tomi.valkeinen@ti.com> 7 */ 8 9 #include <linux/delay.h> 10 #include <linux/gpio.h> 11 #include <linux/module.h> 12 #include <linux/of.h> 13 #include <linux/of_gpio.h> 14 #include <linux/platform_device.h> 15 #include <linux/slab.h> 16 #include <linux/regulator/consumer.h> 17 #include <video/omapfb_dss.h> 18 19 struct panel_drv_data { 20 struct omap_dss_device dssdev; 21 struct omap_dss_device *in; 22 struct regulator *vcc; 23 24 int data_lines; 25 26 struct omap_video_timings videomode; 27 28 struct gpio_desc *resb_gpio; /* low = reset active min 20 us */ 29 struct gpio_desc *ini_gpio; /* high = power on */ 30 struct gpio_desc *mo_gpio; /* low = 480x640, high = 240x320 */ 31 struct gpio_desc *lr_gpio; /* high = conventional horizontal scanning */ 32 struct gpio_desc *ud_gpio; /* high = conventional vertical scanning */ 33 }; 34 35 static const struct omap_video_timings sharp_ls_timings = { 36 .x_res = 480, 37 .y_res = 640, 38 39 .pixelclock = 19200000, 40 41 .hsw = 2, 42 .hfp = 1, 43 .hbp = 28, 44 45 .vsw = 1, 46 .vfp = 1, 47 .vbp = 1, 48 49 .vsync_level = OMAPDSS_SIG_ACTIVE_LOW, 50 .hsync_level = OMAPDSS_SIG_ACTIVE_LOW, 51 .data_pclk_edge = OMAPDSS_DRIVE_SIG_RISING_EDGE, 52 .de_level = OMAPDSS_SIG_ACTIVE_HIGH, 53 .sync_pclk_edge = OMAPDSS_DRIVE_SIG_FALLING_EDGE, 54 }; 55 56 #define to_panel_data(p) container_of(p, struct panel_drv_data, dssdev) 57 58 static int sharp_ls_connect(struct omap_dss_device *dssdev) 59 { 60 struct panel_drv_data *ddata = to_panel_data(dssdev); 61 struct omap_dss_device *in = ddata->in; 62 63 if (omapdss_device_is_connected(dssdev)) 64 return 0; 65 66 return in->ops.dpi->connect(in, dssdev); 67 } 68 69 static void sharp_ls_disconnect(struct omap_dss_device *dssdev) 70 { 71 struct panel_drv_data *ddata = to_panel_data(dssdev); 72 struct omap_dss_device *in = ddata->in; 73 74 if (!omapdss_device_is_connected(dssdev)) 75 return; 76 77 in->ops.dpi->disconnect(in, dssdev); 78 } 79 80 static int sharp_ls_enable(struct omap_dss_device *dssdev) 81 { 82 struct panel_drv_data *ddata = to_panel_data(dssdev); 83 struct omap_dss_device *in = ddata->in; 84 int r; 85 86 if (!omapdss_device_is_connected(dssdev)) 87 return -ENODEV; 88 89 if (omapdss_device_is_enabled(dssdev)) 90 return 0; 91 92 if (ddata->data_lines) 93 in->ops.dpi->set_data_lines(in, ddata->data_lines); 94 in->ops.dpi->set_timings(in, &ddata->videomode); 95 96 if (ddata->vcc) { 97 r = regulator_enable(ddata->vcc); 98 if (r != 0) 99 return r; 100 } 101 102 r = in->ops.dpi->enable(in); 103 if (r) { 104 regulator_disable(ddata->vcc); 105 return r; 106 } 107 108 /* wait couple of vsyncs until enabling the LCD */ 109 msleep(50); 110 111 if (ddata->resb_gpio) 112 gpiod_set_value_cansleep(ddata->resb_gpio, 1); 113 114 if (ddata->ini_gpio) 115 gpiod_set_value_cansleep(ddata->ini_gpio, 1); 116 117 dssdev->state = OMAP_DSS_DISPLAY_ACTIVE; 118 119 return 0; 120 } 121 122 static void sharp_ls_disable(struct omap_dss_device *dssdev) 123 { 124 struct panel_drv_data *ddata = to_panel_data(dssdev); 125 struct omap_dss_device *in = ddata->in; 126 127 if (!omapdss_device_is_enabled(dssdev)) 128 return; 129 130 if (ddata->ini_gpio) 131 gpiod_set_value_cansleep(ddata->ini_gpio, 0); 132 133 if (ddata->resb_gpio) 134 gpiod_set_value_cansleep(ddata->resb_gpio, 0); 135 136 /* wait at least 5 vsyncs after disabling the LCD */ 137 138 msleep(100); 139 140 in->ops.dpi->disable(in); 141 142 if (ddata->vcc) 143 regulator_disable(ddata->vcc); 144 145 dssdev->state = OMAP_DSS_DISPLAY_DISABLED; 146 } 147 148 static void sharp_ls_set_timings(struct omap_dss_device *dssdev, 149 struct omap_video_timings *timings) 150 { 151 struct panel_drv_data *ddata = to_panel_data(dssdev); 152 struct omap_dss_device *in = ddata->in; 153 154 ddata->videomode = *timings; 155 dssdev->panel.timings = *timings; 156 157 in->ops.dpi->set_timings(in, timings); 158 } 159 160 static void sharp_ls_get_timings(struct omap_dss_device *dssdev, 161 struct omap_video_timings *timings) 162 { 163 struct panel_drv_data *ddata = to_panel_data(dssdev); 164 165 *timings = ddata->videomode; 166 } 167 168 static int sharp_ls_check_timings(struct omap_dss_device *dssdev, 169 struct omap_video_timings *timings) 170 { 171 struct panel_drv_data *ddata = to_panel_data(dssdev); 172 struct omap_dss_device *in = ddata->in; 173 174 return in->ops.dpi->check_timings(in, timings); 175 } 176 177 static struct omap_dss_driver sharp_ls_ops = { 178 .connect = sharp_ls_connect, 179 .disconnect = sharp_ls_disconnect, 180 181 .enable = sharp_ls_enable, 182 .disable = sharp_ls_disable, 183 184 .set_timings = sharp_ls_set_timings, 185 .get_timings = sharp_ls_get_timings, 186 .check_timings = sharp_ls_check_timings, 187 188 .get_resolution = omapdss_default_get_resolution, 189 }; 190 191 static int sharp_ls_get_gpio_of(struct device *dev, int index, int val, 192 const char *desc, struct gpio_desc **gpiod) 193 { 194 struct gpio_desc *gd; 195 196 *gpiod = NULL; 197 198 gd = devm_gpiod_get_index(dev, desc, index, GPIOD_OUT_LOW); 199 if (IS_ERR(gd)) 200 return PTR_ERR(gd); 201 202 *gpiod = gd; 203 return 0; 204 } 205 206 static int sharp_ls_probe_of(struct platform_device *pdev) 207 { 208 struct panel_drv_data *ddata = platform_get_drvdata(pdev); 209 struct device_node *node = pdev->dev.of_node; 210 struct omap_dss_device *in; 211 int r; 212 213 ddata->vcc = devm_regulator_get(&pdev->dev, "envdd"); 214 if (IS_ERR(ddata->vcc)) 215 return dev_err_probe(&pdev->dev, PTR_ERR(ddata->vcc), 216 "failed to get regulator\n"); 217 218 /* lcd INI */ 219 r = sharp_ls_get_gpio_of(&pdev->dev, 0, 0, "enable", &ddata->ini_gpio); 220 if (r) 221 return r; 222 223 /* lcd RESB */ 224 r = sharp_ls_get_gpio_of(&pdev->dev, 0, 0, "reset", &ddata->resb_gpio); 225 if (r) 226 return r; 227 228 /* lcd MO */ 229 r = sharp_ls_get_gpio_of(&pdev->dev, 0, 0, "mode", &ddata->mo_gpio); 230 if (r) 231 return r; 232 233 /* lcd LR */ 234 r = sharp_ls_get_gpio_of(&pdev->dev, 1, 1, "mode", &ddata->lr_gpio); 235 if (r) 236 return r; 237 238 /* lcd UD */ 239 r = sharp_ls_get_gpio_of(&pdev->dev, 2, 1, "mode", &ddata->ud_gpio); 240 if (r) 241 return r; 242 243 in = omapdss_of_find_source_for_first_ep(node); 244 if (IS_ERR(in)) { 245 dev_err(&pdev->dev, "failed to find video source\n"); 246 return PTR_ERR(in); 247 } 248 249 ddata->in = in; 250 251 return 0; 252 } 253 254 static int sharp_ls_probe(struct platform_device *pdev) 255 { 256 struct panel_drv_data *ddata; 257 struct omap_dss_device *dssdev; 258 int r; 259 260 if (!pdev->dev.of_node) 261 return -ENODEV; 262 263 ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL); 264 if (ddata == NULL) 265 return -ENOMEM; 266 267 platform_set_drvdata(pdev, ddata); 268 269 r = sharp_ls_probe_of(pdev); 270 if (r) 271 return r; 272 273 ddata->videomode = sharp_ls_timings; 274 275 dssdev = &ddata->dssdev; 276 dssdev->dev = &pdev->dev; 277 dssdev->driver = &sharp_ls_ops; 278 dssdev->type = OMAP_DISPLAY_TYPE_DPI; 279 dssdev->owner = THIS_MODULE; 280 dssdev->panel.timings = ddata->videomode; 281 dssdev->phy.dpi.data_lines = ddata->data_lines; 282 283 r = omapdss_register_display(dssdev); 284 if (r) { 285 dev_err(&pdev->dev, "Failed to register panel\n"); 286 goto err_reg; 287 } 288 289 return 0; 290 291 err_reg: 292 omap_dss_put_device(ddata->in); 293 return r; 294 } 295 296 static int __exit sharp_ls_remove(struct platform_device *pdev) 297 { 298 struct panel_drv_data *ddata = platform_get_drvdata(pdev); 299 struct omap_dss_device *dssdev = &ddata->dssdev; 300 struct omap_dss_device *in = ddata->in; 301 302 omapdss_unregister_display(dssdev); 303 304 sharp_ls_disable(dssdev); 305 sharp_ls_disconnect(dssdev); 306 307 omap_dss_put_device(in); 308 309 return 0; 310 } 311 312 static const struct of_device_id sharp_ls_of_match[] = { 313 { .compatible = "omapdss,sharp,ls037v7dw01", }, 314 {}, 315 }; 316 317 MODULE_DEVICE_TABLE(of, sharp_ls_of_match); 318 319 static struct platform_driver sharp_ls_driver = { 320 .probe = sharp_ls_probe, 321 .remove = __exit_p(sharp_ls_remove), 322 .driver = { 323 .name = "panel-sharp-ls037v7dw01", 324 .of_match_table = sharp_ls_of_match, 325 .suppress_bind_attrs = true, 326 }, 327 }; 328 329 module_platform_driver(sharp_ls_driver); 330 331 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>"); 332 MODULE_DESCRIPTION("Sharp LS037V7DW01 Panel Driver"); 333 MODULE_LICENSE("GPL"); 334