1 // SPDX-License-Identifier: GPL-2.0+
3  * LCD-OLinuXino support for panel driver
72 	struct regulator *supply;  member
85 	struct lcd_olinuxino *lcd = to_lcd_olinuxino(panel);  in lcd_olinuxino_disable()  local
87 	if (!lcd->enabled)  in lcd_olinuxino_disable()
90 	backlight_disable(lcd->backlight);  in lcd_olinuxino_disable()
92 	lcd->enabled = false;  in lcd_olinuxino_disable()
99 	struct lcd_olinuxino *lcd = to_lcd_olinuxino(panel);  in lcd_olinuxino_unprepare()  local
101 	if (!lcd->prepared)  in lcd_olinuxino_unprepare()
104 	gpiod_set_value_cansleep(lcd->enable_gpio, 0);  in lcd_olinuxino_unprepare()
105 	regulator_disable(lcd->supply);  in lcd_olinuxino_unprepare()
107 	lcd->prepared = false;  in lcd_olinuxino_unprepare()
114 	struct lcd_olinuxino *lcd = to_lcd_olinuxino(panel);  in lcd_olinuxino_prepare()  local
117 	if (lcd->prepared)  in lcd_olinuxino_prepare()
120 	ret = regulator_enable(lcd->supply);  in lcd_olinuxino_prepare()
124 	gpiod_set_value_cansleep(lcd->enable_gpio, 1);  in lcd_olinuxino_prepare()
125 	lcd->prepared = true;  in lcd_olinuxino_prepare()
132 	struct lcd_olinuxino *lcd = to_lcd_olinuxino(panel);  in lcd_olinuxino_enable()  local
134 	if (lcd->enabled)  in lcd_olinuxino_enable()
137 	backlight_enable(lcd->backlight);  in lcd_olinuxino_enable()
139 	lcd->enabled = true;  in lcd_olinuxino_enable()
146 	struct lcd_olinuxino *lcd = to_lcd_olinuxino(panel);  in lcd_olinuxino_get_modes()  local
147 	struct drm_connector *connector = lcd->panel.connector;  in lcd_olinuxino_get_modes()
148 	struct lcd_olinuxino_info *lcd_info = &lcd->eeprom.info;  in lcd_olinuxino_get_modes()
149 	struct drm_device *drm = lcd->panel.drm;  in lcd_olinuxino_get_modes()
154 	for (i = 0; i < lcd->eeprom.num_modes; i++) {  in lcd_olinuxino_get_modes()
156 			   &lcd->eeprom.reserved[i * sizeof(*lcd_mode)];  in lcd_olinuxino_get_modes()
160 			dev_err(drm->dev, "failed to add mode %ux%u@%u\n",  in lcd_olinuxino_get_modes()
161 				lcd_mode->hactive,  in lcd_olinuxino_get_modes()
162 				lcd_mode->vactive,  in lcd_olinuxino_get_modes()
163 				lcd_mode->refresh);  in lcd_olinuxino_get_modes()
167 		mode->clock = lcd_mode->pixelclock;  in lcd_olinuxino_get_modes()
168 		mode->hdisplay = lcd_mode->hactive;  in lcd_olinuxino_get_modes()
169 		mode->hsync_start = lcd_mode->hactive + lcd_mode->hfp;  in lcd_olinuxino_get_modes()
170 		mode->hsync_end = lcd_mode->hactive + lcd_mode->hfp +  in lcd_olinuxino_get_modes()
171 				  lcd_mode->hpw;  in lcd_olinuxino_get_modes()
172 		mode->htotal = lcd_mode->hactive + lcd_mode->hfp +  in lcd_olinuxino_get_modes()
173 			       lcd_mode->hpw + lcd_mode->hbp;  in lcd_olinuxino_get_modes()
174 		mode->vdisplay = lcd_mode->vactive;  in lcd_olinuxino_get_modes()
175 		mode->vsync_start = lcd_mode->vactive + lcd_mode->vfp;  in lcd_olinuxino_get_modes()
176 		mode->vsync_end = lcd_mode->vactive + lcd_mode->vfp +  in lcd_olinuxino_get_modes()
177 				  lcd_mode->vpw;  in lcd_olinuxino_get_modes()
178 		mode->vtotal = lcd_mode->vactive + lcd_mode->vfp +  in lcd_olinuxino_get_modes()
179 			       lcd_mode->vpw + lcd_mode->vbp;  in lcd_olinuxino_get_modes()
180 		mode->vrefresh = lcd_mode->refresh;  in lcd_olinuxino_get_modes()
184 			mode->type |= DRM_MODE_TYPE_PREFERRED;  in lcd_olinuxino_get_modes()
185 		mode->type |= DRM_MODE_TYPE_DRIVER;  in lcd_olinuxino_get_modes()
193 	connector->display_info.width_mm = lcd_info->width_mm;  in lcd_olinuxino_get_modes()
194 	connector->display_info.height_mm = lcd_info->height_mm;  in lcd_olinuxino_get_modes()
195 	connector->display_info.bpc = lcd_info->bpc;  in lcd_olinuxino_get_modes()
197 	if (lcd_info->bus_format)  in lcd_olinuxino_get_modes()
198 		drm_display_info_set_bus_formats(&connector->display_info,  in lcd_olinuxino_get_modes()
199 						 &lcd_info->bus_format, 1);  in lcd_olinuxino_get_modes()
200 	connector->display_info.bus_flags = lcd_info->bus_flag;  in lcd_olinuxino_get_modes()
216 	struct device *dev = &client->dev;  in lcd_olinuxino_probe()
217 	struct lcd_olinuxino *lcd;  in lcd_olinuxino_probe()  local
221 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C |  in lcd_olinuxino_probe()
223 		return -ENODEV;  in lcd_olinuxino_probe()
225 	lcd = devm_kzalloc(dev, sizeof(*lcd), GFP_KERNEL);  in lcd_olinuxino_probe()
226 	if (!lcd)  in lcd_olinuxino_probe()
227 		return -ENOMEM;  in lcd_olinuxino_probe()
229 	i2c_set_clientdata(client, lcd);  in lcd_olinuxino_probe()
230 	lcd->dev = dev;  in lcd_olinuxino_probe()
231 	lcd->client = client;  in lcd_olinuxino_probe()
233 	mutex_init(&lcd->mutex);  in lcd_olinuxino_probe()
237 		mutex_lock(&lcd->mutex);  in lcd_olinuxino_probe()
241 						    (u8 *)&lcd->eeprom + i);  in lcd_olinuxino_probe()
242 		mutex_unlock(&lcd->mutex);  in lcd_olinuxino_probe()
250 	checksum = ~crc32(~0, (u8 *)&lcd->eeprom, 252);  in lcd_olinuxino_probe()
251 	if (checksum != lcd->eeprom.checksum) {  in lcd_olinuxino_probe()
253 		return -EINVAL;  in lcd_olinuxino_probe()
257 	if (lcd->eeprom.header != LCD_OLINUXINO_HEADER_MAGIC) {  in lcd_olinuxino_probe()
259 		return -EINVAL;  in lcd_olinuxino_probe()
263 		 lcd->eeprom.info.name,  in lcd_olinuxino_probe()
264 		 lcd->eeprom.revision,  in lcd_olinuxino_probe()
265 		 lcd->eeprom.serial);  in lcd_olinuxino_probe()
271 	if (lcd->eeprom.num_modes > 4) {  in lcd_olinuxino_probe()
273 		lcd->eeprom.num_modes = 4;  in lcd_olinuxino_probe()
276 	lcd->enabled = false;  in lcd_olinuxino_probe()
277 	lcd->prepared = false;  in lcd_olinuxino_probe()
279 	lcd->supply = devm_regulator_get(dev, "power");  in lcd_olinuxino_probe()
280 	if (IS_ERR(lcd->supply))  in lcd_olinuxino_probe()
281 		return PTR_ERR(lcd->supply);  in lcd_olinuxino_probe()
283 	lcd->enable_gpio = devm_gpiod_get(dev, "enable", GPIOD_OUT_LOW);  in lcd_olinuxino_probe()
284 	if (IS_ERR(lcd->enable_gpio))  in lcd_olinuxino_probe()
285 		return PTR_ERR(lcd->enable_gpio);  in lcd_olinuxino_probe()
287 	lcd->backlight = devm_of_find_backlight(dev);  in lcd_olinuxino_probe()
288 	if (IS_ERR(lcd->backlight))  in lcd_olinuxino_probe()
289 		return PTR_ERR(lcd->backlight);  in lcd_olinuxino_probe()
291 	drm_panel_init(&lcd->panel);  in lcd_olinuxino_probe()
292 	lcd->panel.dev = dev;  in lcd_olinuxino_probe()
293 	lcd->panel.funcs = &lcd_olinuxino_funcs;  in lcd_olinuxino_probe()
295 	return drm_panel_add(&lcd->panel);  in lcd_olinuxino_probe()
302 	drm_panel_remove(&panel->panel);  in lcd_olinuxino_remove()
304 	lcd_olinuxino_disable(&panel->panel);  in lcd_olinuxino_remove()
305 	lcd_olinuxino_unprepare(&panel->panel);  in lcd_olinuxino_remove()
311 	{ .compatible = "olimex,lcd-olinuxino" },
328 MODULE_DESCRIPTION("LCD-OLinuXino driver");