1 // SPDX-License-Identifier: GPL-2.0
5  * Found in the Samsung Galaxy Ace 2 GT-I8160 mobile phone.
7  * Inspired by code and know-how in the vendor driver by Gareth Phillips.
18 #include <linux/media-bus-format.h>
29 #define WS2401_BCMODE			0xc1 /* Backlight control mode */
33 #define WS2401_WRMIE			0xc7 /* Write MIE mode */
58  * struct ws2401 - state container for a panel controlled by the WS2401
72 	/** @reset: reset GPIO line */
73 	struct gpio_desc *reset;  member
106 	struct mipi_dbi *dbi = &ws->dbi;  in ws2401_read_mtp_id()
112 		dev_err(ws->dev, "unable to read MTP ID 1\n");  in ws2401_read_mtp_id()
117 		dev_err(ws->dev, "unable to read MTP ID 2\n");  in ws2401_read_mtp_id()
122 		dev_err(ws->dev, "unable to read MTP ID 3\n");  in ws2401_read_mtp_id()
125 	dev_info(ws->dev, "MTP ID: %02x %02x %02x\n", id1, id2, id3);  in ws2401_read_mtp_id()
130 	struct mipi_dbi *dbi = &ws->dbi;  in ws2401_power_on()
134 	ret = regulator_bulk_enable(ARRAY_SIZE(ws->regulators),  in ws2401_power_on()
135 				    ws->regulators);  in ws2401_power_on()
137 		dev_err(ws->dev, "failed to enable regulators: %d\n", ret);  in ws2401_power_on()
142 	/* Assert reset >=1 ms */  in ws2401_power_on()
143 	gpiod_set_value_cansleep(ws->reset, 1);  in ws2401_power_on()
145 	/* De-assert reset */  in ws2401_power_on()
146 	gpiod_set_value_cansleep(ws->reset, 0);  in ws2401_power_on()
149 	dev_dbg(ws->dev, "de-asserted RESET\n");  in ws2401_power_on()
152 	 * Exit sleep mode and initialize display - some hammering is  in ws2401_power_on()
163 	/* Set addressing mode Flip V(d0), Flip H(d1) RGB/BGR(d3) */  in ws2401_power_on()
170 	mipi_dbi_command(dbi, WS2401_NSMPS, 0x06, 0x03, /* DDVDH: -4.6v */  in ws2401_power_on()
174 			 0xb4,	/* VGH:16.1v, VGL:-13.8v */  in ws2401_power_on()
176 			 0x50,	/* GREFN:-4.2v (default) */  in ws2401_power_on()
178 			 0x44);	/* VOUTL:-10v (default) */  in ws2401_power_on()
188 	/* Set up gamma, probably these are P-gamma and N-gamma for each color */  in ws2401_power_on()
208 	if (ws->internal_bl) {  in ws2401_power_on()
225 	/* Go into RESET and disable regulators */  in ws2401_power_off()
226 	gpiod_set_value_cansleep(ws->reset, 1);  in ws2401_power_off()
227 	return regulator_bulk_disable(ARRAY_SIZE(ws->regulators),  in ws2401_power_off()
228 				      ws->regulators);  in ws2401_power_off()
234 	struct mipi_dbi *dbi = &ws->dbi;  in ws2401_unprepare()
237 	if (ws->internal_bl)  in ws2401_unprepare()
247 	struct mipi_dbi *dbi = &ws->dbi;  in ws2401_disable()
263 	struct mipi_dbi *dbi = &ws->dbi;  in ws2401_enable()
271  * ws2401_get_modes() - return the mode
272  * @panel: the panel to get the mode for
279 	struct drm_display_mode *mode;  in ws2401_get_modes()  local
284 	 * this mode, the following connector display_info settings and  in ws2401_get_modes()
288 	mode = drm_mode_duplicate(connector->dev, &lms380kf01_480_800_mode);  in ws2401_get_modes()
289 	if (!mode) {  in ws2401_get_modes()
290 		dev_err(ws->dev, "failed to add mode\n");  in ws2401_get_modes()
291 		return -ENOMEM;  in ws2401_get_modes()
294 	connector->display_info.bpc = 8;  in ws2401_get_modes()
295 	connector->display_info.width_mm = mode->width_mm;  in ws2401_get_modes()
296 	connector->display_info.height_mm = mode->height_mm;  in ws2401_get_modes()
297 	connector->display_info.bus_flags =  in ws2401_get_modes()
299 	drm_display_info_set_bus_formats(&connector->display_info,  in ws2401_get_modes()
302 	drm_mode_set_name(mode);  in ws2401_get_modes()
303 	mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;  in ws2401_get_modes()
305 	drm_mode_probed_add(connector, mode);  in ws2401_get_modes()
321 	struct mipi_dbi *dbi = &ws->dbi;  in ws2401_set_brightness()
346 	struct device *dev = &spi->dev;  in ws2401_probe()
352 		return -ENOMEM;  in ws2401_probe()
353 	ws->dev = dev;  in ws2401_probe()
359 	ws->regulators[0].supply = "vci";  in ws2401_probe()
360 	ws->regulators[1].supply = "vccio";  in ws2401_probe()
362 				      ARRAY_SIZE(ws->regulators),  in ws2401_probe()
363 				      ws->regulators);  in ws2401_probe()
367 	ws->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);  in ws2401_probe()
368 	if (IS_ERR(ws->reset)) {  in ws2401_probe()
369 		ret = PTR_ERR(ws->reset);  in ws2401_probe()
370 		return dev_err_probe(dev, ret, "no RESET GPIO\n");  in ws2401_probe()
373 	ret = mipi_dbi_spi_init(spi, &ws->dbi, NULL);  in ws2401_probe()
376 	ws->dbi.read_commands = ws2401_dbi_read_commands;  in ws2401_probe()
382 	drm_panel_init(&ws->panel, dev, &ws2401_drm_funcs,  in ws2401_probe()
385 	ret = drm_panel_of_backlight(&ws->panel);  in ws2401_probe()
390 	if (!ws->panel.backlight) {  in ws2401_probe()
392 		ws->panel.backlight =  in ws2401_probe()
395 		if (IS_ERR(ws->panel.backlight))  in ws2401_probe()
396 			return dev_err_probe(dev, PTR_ERR(ws->panel.backlight),  in ws2401_probe()
404 	drm_panel_add(&ws->panel);  in ws2401_probe()
414 	drm_panel_remove(&ws->panel);  in ws2401_remove()
439 		.name	= "ws2401-panel",