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 dev_err(&pdev->dev, "failed to get regulator\n"); 216 return PTR_ERR(ddata->vcc); 217 } 218 219 /* lcd INI */ 220 r = sharp_ls_get_gpio_of(&pdev->dev, 0, 0, "enable", &ddata->ini_gpio); 221 if (r) 222 return r; 223 224 /* lcd RESB */ 225 r = sharp_ls_get_gpio_of(&pdev->dev, 0, 0, "reset", &ddata->resb_gpio); 226 if (r) 227 return r; 228 229 /* lcd MO */ 230 r = sharp_ls_get_gpio_of(&pdev->dev, 0, 0, "mode", &ddata->mo_gpio); 231 if (r) 232 return r; 233 234 /* lcd LR */ 235 r = sharp_ls_get_gpio_of(&pdev->dev, 1, 1, "mode", &ddata->lr_gpio); 236 if (r) 237 return r; 238 239 /* lcd UD */ 240 r = sharp_ls_get_gpio_of(&pdev->dev, 2, 1, "mode", &ddata->ud_gpio); 241 if (r) 242 return r; 243 244 in = omapdss_of_find_source_for_first_ep(node); 245 if (IS_ERR(in)) { 246 dev_err(&pdev->dev, "failed to find video source\n"); 247 return PTR_ERR(in); 248 } 249 250 ddata->in = in; 251 252 return 0; 253 } 254 255 static int sharp_ls_probe(struct platform_device *pdev) 256 { 257 struct panel_drv_data *ddata; 258 struct omap_dss_device *dssdev; 259 int r; 260 261 if (!pdev->dev.of_node) 262 return -ENODEV; 263 264 ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL); 265 if (ddata == NULL) 266 return -ENOMEM; 267 268 platform_set_drvdata(pdev, ddata); 269 270 r = sharp_ls_probe_of(pdev); 271 if (r) 272 return r; 273 274 ddata->videomode = sharp_ls_timings; 275 276 dssdev = &ddata->dssdev; 277 dssdev->dev = &pdev->dev; 278 dssdev->driver = &sharp_ls_ops; 279 dssdev->type = OMAP_DISPLAY_TYPE_DPI; 280 dssdev->owner = THIS_MODULE; 281 dssdev->panel.timings = ddata->videomode; 282 dssdev->phy.dpi.data_lines = ddata->data_lines; 283 284 r = omapdss_register_display(dssdev); 285 if (r) { 286 dev_err(&pdev->dev, "Failed to register panel\n"); 287 goto err_reg; 288 } 289 290 return 0; 291 292 err_reg: 293 omap_dss_put_device(ddata->in); 294 return r; 295 } 296 297 static int __exit sharp_ls_remove(struct platform_device *pdev) 298 { 299 struct panel_drv_data *ddata = platform_get_drvdata(pdev); 300 struct omap_dss_device *dssdev = &ddata->dssdev; 301 struct omap_dss_device *in = ddata->in; 302 303 omapdss_unregister_display(dssdev); 304 305 sharp_ls_disable(dssdev); 306 sharp_ls_disconnect(dssdev); 307 308 omap_dss_put_device(in); 309 310 return 0; 311 } 312 313 static const struct of_device_id sharp_ls_of_match[] = { 314 { .compatible = "omapdss,sharp,ls037v7dw01", }, 315 {}, 316 }; 317 318 MODULE_DEVICE_TABLE(of, sharp_ls_of_match); 319 320 static struct platform_driver sharp_ls_driver = { 321 .probe = sharp_ls_probe, 322 .remove = __exit_p(sharp_ls_remove), 323 .driver = { 324 .name = "panel-sharp-ls037v7dw01", 325 .of_match_table = sharp_ls_of_match, 326 .suppress_bind_attrs = true, 327 }, 328 }; 329 330 module_platform_driver(sharp_ls_driver); 331 332 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>"); 333 MODULE_DESCRIPTION("Sharp LS037V7DW01 Panel Driver"); 334 MODULE_LICENSE("GPL"); 335