1 // SPDX-License-Identifier: GPL-2.0+
3  * LCD-OLinuXino support for panel driver
83 	struct lcd_olinuxino *lcd = to_lcd_olinuxino(panel);  in lcd_olinuxino_disable()  local
85 	if (!lcd->enabled)  in lcd_olinuxino_disable()
88 	lcd->enabled = false;  in lcd_olinuxino_disable()
95 	struct lcd_olinuxino *lcd = to_lcd_olinuxino(panel);  in lcd_olinuxino_unprepare()  local
97 	if (!lcd->prepared)  in lcd_olinuxino_unprepare()
100 	gpiod_set_value_cansleep(lcd->enable_gpio, 0);  in lcd_olinuxino_unprepare()
101 	regulator_disable(lcd->supply);  in lcd_olinuxino_unprepare()
103 	lcd->prepared = false;  in lcd_olinuxino_unprepare()
110 	struct lcd_olinuxino *lcd = to_lcd_olinuxino(panel);  in lcd_olinuxino_prepare()  local
113 	if (lcd->prepared)  in lcd_olinuxino_prepare()
116 	ret = regulator_enable(lcd->supply);  in lcd_olinuxino_prepare()
120 	gpiod_set_value_cansleep(lcd->enable_gpio, 1);  in lcd_olinuxino_prepare()
121 	lcd->prepared = true;  in lcd_olinuxino_prepare()
128 	struct lcd_olinuxino *lcd = to_lcd_olinuxino(panel);  in lcd_olinuxino_enable()  local
130 	if (lcd->enabled)  in lcd_olinuxino_enable()
133 	lcd->enabled = true;  in lcd_olinuxino_enable()
141 	struct lcd_olinuxino *lcd = to_lcd_olinuxino(panel);  in lcd_olinuxino_get_modes()  local
142 	struct lcd_olinuxino_info *lcd_info = &lcd->eeprom.info;  in lcd_olinuxino_get_modes()
147 	for (i = 0; i < lcd->eeprom.num_modes; i++) {  in lcd_olinuxino_get_modes()
149 			   &lcd->eeprom.reserved[i * sizeof(*lcd_mode)];  in lcd_olinuxino_get_modes()
151 		mode = drm_mode_create(connector->dev);  in lcd_olinuxino_get_modes()
153 			dev_err(panel->dev, "failed to add mode %ux%u@%u\n",  in lcd_olinuxino_get_modes()
154 				lcd_mode->hactive,  in lcd_olinuxino_get_modes()
155 				lcd_mode->vactive,  in lcd_olinuxino_get_modes()
156 				lcd_mode->refresh);  in lcd_olinuxino_get_modes()
160 		mode->clock = lcd_mode->pixelclock;  in lcd_olinuxino_get_modes()
161 		mode->hdisplay = lcd_mode->hactive;  in lcd_olinuxino_get_modes()
162 		mode->hsync_start = lcd_mode->hactive + lcd_mode->hfp;  in lcd_olinuxino_get_modes()
163 		mode->hsync_end = lcd_mode->hactive + lcd_mode->hfp +  in lcd_olinuxino_get_modes()
164 				  lcd_mode->hpw;  in lcd_olinuxino_get_modes()
165 		mode->htotal = lcd_mode->hactive + lcd_mode->hfp +  in lcd_olinuxino_get_modes()
166 			       lcd_mode->hpw + lcd_mode->hbp;  in lcd_olinuxino_get_modes()
167 		mode->vdisplay = lcd_mode->vactive;  in lcd_olinuxino_get_modes()
168 		mode->vsync_start = lcd_mode->vactive + lcd_mode->vfp;  in lcd_olinuxino_get_modes()
169 		mode->vsync_end = lcd_mode->vactive + lcd_mode->vfp +  in lcd_olinuxino_get_modes()
170 				  lcd_mode->vpw;  in lcd_olinuxino_get_modes()
171 		mode->vtotal = lcd_mode->vactive + lcd_mode->vfp +  in lcd_olinuxino_get_modes()
172 			       lcd_mode->vpw + lcd_mode->vbp;  in lcd_olinuxino_get_modes()
176 			mode->type |= DRM_MODE_TYPE_PREFERRED;  in lcd_olinuxino_get_modes()
177 		mode->type |= DRM_MODE_TYPE_DRIVER;  in lcd_olinuxino_get_modes()
185 	connector->display_info.width_mm = lcd_info->width_mm;  in lcd_olinuxino_get_modes()
186 	connector->display_info.height_mm = lcd_info->height_mm;  in lcd_olinuxino_get_modes()
187 	connector->display_info.bpc = lcd_info->bpc;  in lcd_olinuxino_get_modes()
189 	if (lcd_info->bus_format)  in lcd_olinuxino_get_modes()
190 		drm_display_info_set_bus_formats(&connector->display_info,  in lcd_olinuxino_get_modes()
191 						 &lcd_info->bus_format, 1);  in lcd_olinuxino_get_modes()
192 	connector->display_info.bus_flags = lcd_info->bus_flag;  in lcd_olinuxino_get_modes()
208 	struct device *dev = &client->dev;  in lcd_olinuxino_probe()
209 	struct lcd_olinuxino *lcd;  in lcd_olinuxino_probe()  local
213 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C |  in lcd_olinuxino_probe()
215 		return -ENODEV;  in lcd_olinuxino_probe()
217 	lcd = devm_kzalloc(dev, sizeof(*lcd), GFP_KERNEL);  in lcd_olinuxino_probe()
218 	if (!lcd)  in lcd_olinuxino_probe()
219 		return -ENOMEM;  in lcd_olinuxino_probe()
221 	i2c_set_clientdata(client, lcd);  in lcd_olinuxino_probe()
222 	lcd->dev = dev;  in lcd_olinuxino_probe()
223 	lcd->client = client;  in lcd_olinuxino_probe()
225 	mutex_init(&lcd->mutex);  in lcd_olinuxino_probe()
229 		mutex_lock(&lcd->mutex);  in lcd_olinuxino_probe()
233 						    (u8 *)&lcd->eeprom + i);  in lcd_olinuxino_probe()
234 		mutex_unlock(&lcd->mutex);  in lcd_olinuxino_probe()
242 	checksum = ~crc32(~0, (u8 *)&lcd->eeprom, 252);  in lcd_olinuxino_probe()
243 	if (checksum != lcd->eeprom.checksum) {  in lcd_olinuxino_probe()
245 		return -EINVAL;  in lcd_olinuxino_probe()
249 	if (lcd->eeprom.header != LCD_OLINUXINO_HEADER_MAGIC) {  in lcd_olinuxino_probe()
251 		return -EINVAL;  in lcd_olinuxino_probe()
255 		 lcd->eeprom.info.name,  in lcd_olinuxino_probe()
256 		 lcd->eeprom.revision,  in lcd_olinuxino_probe()
257 		 lcd->eeprom.serial);  in lcd_olinuxino_probe()
263 	if (lcd->eeprom.num_modes > 4) {  in lcd_olinuxino_probe()
265 		lcd->eeprom.num_modes = 4;  in lcd_olinuxino_probe()
268 	lcd->enabled = false;  in lcd_olinuxino_probe()
269 	lcd->prepared = false;  in lcd_olinuxino_probe()
271 	lcd->supply = devm_regulator_get(dev, "power");  in lcd_olinuxino_probe()
272 	if (IS_ERR(lcd->supply))  in lcd_olinuxino_probe()
273 		return PTR_ERR(lcd->supply);  in lcd_olinuxino_probe()
275 	lcd->enable_gpio = devm_gpiod_get(dev, "enable", GPIOD_OUT_LOW);  in lcd_olinuxino_probe()
276 	if (IS_ERR(lcd->enable_gpio))  in lcd_olinuxino_probe()
277 		return PTR_ERR(lcd->enable_gpio);  in lcd_olinuxino_probe()
279 	drm_panel_init(&lcd->panel, dev, &lcd_olinuxino_funcs,  in lcd_olinuxino_probe()
282 	ret = drm_panel_of_backlight(&lcd->panel);  in lcd_olinuxino_probe()
286 	drm_panel_add(&lcd->panel);  in lcd_olinuxino_probe()
295 	drm_panel_remove(&panel->panel);  in lcd_olinuxino_remove()
297 	drm_panel_disable(&panel->panel);  in lcd_olinuxino_remove()
298 	drm_panel_unprepare(&panel->panel);  in lcd_olinuxino_remove()
304 	{ .compatible = "olimex,lcd-olinuxino" },
321 MODULE_DESCRIPTION("LCD-OLinuXino driver");