1 // SPDX-License-Identifier: GPL-2.0+
3  * LCD-OLinuXino support for panel driver
42 	char name[32];  member
70 	struct lcd_olinuxino_eeprom eeprom;  member
82 	gpiod_set_value_cansleep(lcd->enable_gpio, 0);  in lcd_olinuxino_unprepare()
83 	regulator_disable(lcd->supply);  in lcd_olinuxino_unprepare()
93 	ret = regulator_enable(lcd->supply);  in lcd_olinuxino_prepare()
97 	gpiod_set_value_cansleep(lcd->enable_gpio, 1);  in lcd_olinuxino_prepare()
106 	struct lcd_olinuxino_info *lcd_info = &lcd->eeprom.info;  in lcd_olinuxino_get_modes()
111 	for (i = 0; i < lcd->eeprom.num_modes; i++) {  in lcd_olinuxino_get_modes()
113 			   &lcd->eeprom.reserved[i * sizeof(*lcd_mode)];  in lcd_olinuxino_get_modes()
115 		mode = drm_mode_create(connector->dev);  in lcd_olinuxino_get_modes()
117 			dev_err(panel->dev, "failed to add mode %ux%u@%u\n",  in lcd_olinuxino_get_modes()
118 				lcd_mode->hactive,  in lcd_olinuxino_get_modes()
119 				lcd_mode->vactive,  in lcd_olinuxino_get_modes()
120 				lcd_mode->refresh);  in lcd_olinuxino_get_modes()
124 		mode->clock = lcd_mode->pixelclock;  in lcd_olinuxino_get_modes()
125 		mode->hdisplay = lcd_mode->hactive;  in lcd_olinuxino_get_modes()
126 		mode->hsync_start = lcd_mode->hactive + lcd_mode->hfp;  in lcd_olinuxino_get_modes()
127 		mode->hsync_end = lcd_mode->hactive + lcd_mode->hfp +  in lcd_olinuxino_get_modes()
128 				  lcd_mode->hpw;  in lcd_olinuxino_get_modes()
129 		mode->htotal = lcd_mode->hactive + lcd_mode->hfp +  in lcd_olinuxino_get_modes()
130 			       lcd_mode->hpw + lcd_mode->hbp;  in lcd_olinuxino_get_modes()
131 		mode->vdisplay = lcd_mode->vactive;  in lcd_olinuxino_get_modes()
132 		mode->vsync_start = lcd_mode->vactive + lcd_mode->vfp;  in lcd_olinuxino_get_modes()
133 		mode->vsync_end = lcd_mode->vactive + lcd_mode->vfp +  in lcd_olinuxino_get_modes()
134 				  lcd_mode->vpw;  in lcd_olinuxino_get_modes()
135 		mode->vtotal = lcd_mode->vactive + lcd_mode->vfp +  in lcd_olinuxino_get_modes()
136 			       lcd_mode->vpw + lcd_mode->vbp;  in lcd_olinuxino_get_modes()
140 			mode->type |= DRM_MODE_TYPE_PREFERRED;  in lcd_olinuxino_get_modes()
141 		mode->type |= DRM_MODE_TYPE_DRIVER;  in lcd_olinuxino_get_modes()
149 	connector->display_info.width_mm = lcd_info->width_mm;  in lcd_olinuxino_get_modes()
150 	connector->display_info.height_mm = lcd_info->height_mm;  in lcd_olinuxino_get_modes()
151 	connector->display_info.bpc = lcd_info->bpc;  in lcd_olinuxino_get_modes()
153 	if (lcd_info->bus_format)  in lcd_olinuxino_get_modes()
154 		drm_display_info_set_bus_formats(&connector->display_info,  in lcd_olinuxino_get_modes()
155 						 &lcd_info->bus_format, 1);  in lcd_olinuxino_get_modes()
156 	connector->display_info.bus_flags = lcd_info->bus_flag;  in lcd_olinuxino_get_modes()
169 	struct device *dev = &client->dev;  in lcd_olinuxino_probe()
174 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C |  in lcd_olinuxino_probe()
176 		return -ENODEV;  in lcd_olinuxino_probe()
180 		return -ENOMEM;  in lcd_olinuxino_probe()
183 	lcd->dev = dev;  in lcd_olinuxino_probe()
184 	lcd->client = client;  in lcd_olinuxino_probe()
186 	mutex_init(&lcd->mutex);  in lcd_olinuxino_probe()
190 		mutex_lock(&lcd->mutex);  in lcd_olinuxino_probe()
194 						    (u8 *)&lcd->eeprom + i);  in lcd_olinuxino_probe()
195 		mutex_unlock(&lcd->mutex);  in lcd_olinuxino_probe()
203 	checksum = ~crc32(~0, (u8 *)&lcd->eeprom, 252);  in lcd_olinuxino_probe()
204 	if (checksum != lcd->eeprom.checksum) {  in lcd_olinuxino_probe()
206 		return -EINVAL;  in lcd_olinuxino_probe()
210 	if (lcd->eeprom.header != LCD_OLINUXINO_HEADER_MAGIC) {  in lcd_olinuxino_probe()
212 		return -EINVAL;  in lcd_olinuxino_probe()
216 		 lcd->eeprom.info.name,  in lcd_olinuxino_probe()
217 		 lcd->eeprom.revision,  in lcd_olinuxino_probe()
218 		 lcd->eeprom.serial);  in lcd_olinuxino_probe()
221 	 * The eeprom can hold up to 4 modes.  in lcd_olinuxino_probe()
224 	if (lcd->eeprom.num_modes > 4) {  in lcd_olinuxino_probe()
226 		lcd->eeprom.num_modes = 4;  in lcd_olinuxino_probe()
229 	lcd->supply = devm_regulator_get(dev, "power");  in lcd_olinuxino_probe()
230 	if (IS_ERR(lcd->supply))  in lcd_olinuxino_probe()
231 		return PTR_ERR(lcd->supply);  in lcd_olinuxino_probe()
233 	lcd->enable_gpio = devm_gpiod_get(dev, "enable", GPIOD_OUT_LOW);  in lcd_olinuxino_probe()
234 	if (IS_ERR(lcd->enable_gpio))  in lcd_olinuxino_probe()
235 		return PTR_ERR(lcd->enable_gpio);  in lcd_olinuxino_probe()
237 	drm_panel_init(&lcd->panel, dev, &lcd_olinuxino_funcs,  in lcd_olinuxino_probe()
240 	ret = drm_panel_of_backlight(&lcd->panel);  in lcd_olinuxino_probe()
244 	drm_panel_add(&lcd->panel);  in lcd_olinuxino_probe()
253 	drm_panel_remove(&panel->panel);  in lcd_olinuxino_remove()
257 	{ .compatible = "olimex,lcd-olinuxino" },
264 		.name = "lcd_olinuxino",
274 MODULE_DESCRIPTION("LCD-OLinuXino driver");