1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * LCD driver for MIPI DBI-C / DCS compatible LCDs
16 #include <linux/platform_data/lcd-mipid.h>
64 	BUG_ON(md->spi == NULL);  in mipid_transfer()
72 	x->tx_buf		= &cmd;  in mipid_transfer()
73 	x->bits_per_word	= 9;  in mipid_transfer()
74 	x->len			= 2;  in mipid_transfer()
79 		x->tx_buf		= wbuf;  in mipid_transfer()
80 		x->len			= wlen;  in mipid_transfer()
81 		x->bits_per_word	= 9;  in mipid_transfer()
87 		x->rx_buf	= &w;  in mipid_transfer()
88 		x->len		= 1;  in mipid_transfer()
95 			x->bits_per_word = 9;  in mipid_transfer()
96 			x->len		 = 2;  in mipid_transfer()
99 			x->rx_buf	 = &rbuf[1];  in mipid_transfer()
100 			x->len		 = rlen - 1;  in mipid_transfer()
105 	r = spi_sync(md->spi, &m);  in mipid_transfer()
107 		dev_dbg(&md->spi->dev, "spi_sync %d\n", r);  in mipid_transfer()
153 	set_data_lines(md, md->panel.data_lines);  in send_init_string()
158 	md->hw_guard_wait = msecs_to_jiffies(guard_msec);  in hw_guard_start()
159 	md->hw_guard_end = jiffies + md->hw_guard_wait;  in hw_guard_start()
164 	unsigned long wait = md->hw_guard_end - jiffies;  in hw_guard_wait()
166 	if ((long)wait > 0 && time_before_eq(wait,  md->hw_guard_wait)) {  in hw_guard_wait()
204 	struct mipid_platform_data *pd = md->spi->dev.platform_data;  in mipid_set_bklight_level()
206 	if (pd->get_bklight_max == NULL || pd->set_bklight_level == NULL)  in mipid_set_bklight_level()
207 		return -ENODEV;  in mipid_set_bklight_level()
208 	if (level > pd->get_bklight_max(pd))  in mipid_set_bklight_level()
209 		return -EINVAL;  in mipid_set_bklight_level()
210 	if (!md->enabled) {  in mipid_set_bklight_level()
211 		md->saved_bklight_level = level;  in mipid_set_bklight_level()
214 	pd->set_bklight_level(pd, level);  in mipid_set_bklight_level()
222 	struct mipid_platform_data *pd = md->spi->dev.platform_data;  in mipid_get_bklight_level()
224 	if (pd->get_bklight_level == NULL)  in mipid_get_bklight_level()
225 		return -ENODEV;  in mipid_get_bklight_level()
226 	return pd->get_bklight_level(pd);  in mipid_get_bklight_level()
232 	struct mipid_platform_data *pd = md->spi->dev.platform_data;  in mipid_get_bklight_max()
234 	if (pd->get_bklight_max == NULL)  in mipid_get_bklight_max()
235 		return -ENODEV;  in mipid_get_bklight_max()
237 	return pd->get_bklight_max(pd);  in mipid_get_bklight_max()
250 	mutex_lock(&md->mutex);  in read_first_pixel()
254 	mutex_unlock(&md->mutex);  in read_first_pixel()
256 	switch (md->panel.data_lines) {  in read_first_pixel()
261 		/* 24 bit -> 16 bit */  in read_first_pixel()
288 		omapfb_write_first_pixel(md->fbdev, test_values[i]);  in mipid_run_test()
299 				dev_err(&md->spi->dev,  in mipid_run_test()
314 	dev_err(&md->spi->dev, "performing LCD ESD recovery\n");  in ls041y3_esd_recover()
326 	dev_dbg(&md->spi->dev, "ESD mode 1 state1 %02x state2 %02x\n",  in ls041y3_esd_check_mode1()
355 		mipid_write(md, rd->cmd, (u8 *)rd->wbuf, rd->wlen);  in ls041y3_esd_check_mode2()
358 	mipid_read(md, rd->cmd, rbuf, 2);  in ls041y3_esd_check_mode2()
363 		mipid_write(md, rd->cmd, (u8 *)rd->wbuf, rd->wlen);  in ls041y3_esd_check_mode2()
366 	dev_dbg(&md->spi->dev, "ESD mode 2 state %02x\n", rbuf[1]);  in ls041y3_esd_check_mode2()
374 	if (md->revision >= 0x88)  in ls041y3_esd_check()
380 	if (md->esd_check != NULL)  in mipid_esd_start_check()
381 		schedule_delayed_work(&md->esd_work,  in mipid_esd_start_check()
387 	if (md->esd_check != NULL)  in mipid_esd_stop_check()
388 		cancel_delayed_work_sync(&md->esd_work);  in mipid_esd_stop_check()
396 	mutex_lock(&md->mutex);  in mipid_esd_work()
397 	md->esd_check(md);  in mipid_esd_work()
398 	mutex_unlock(&md->mutex);  in mipid_esd_work()
406 	mutex_lock(&md->mutex);  in mipid_enable()
408 	if (md->enabled) {  in mipid_enable()
409 		mutex_unlock(&md->mutex);  in mipid_enable()
413 	md->enabled = 1;  in mipid_enable()
416 	mipid_set_bklight_level(panel, md->saved_bklight_level);  in mipid_enable()
419 	mutex_unlock(&md->mutex);  in mipid_enable()
432 	mutex_lock(&md->mutex);  in mipid_disable()
434 	if (!md->enabled) {  in mipid_disable()
435 		mutex_unlock(&md->mutex);  in mipid_disable()
438 	md->saved_bklight_level = mipid_get_bklight_level(panel);  in mipid_disable()
442 	md->enabled = 0;  in mipid_disable()
444 	mutex_unlock(&md->mutex);  in mipid_disable()
455 	dev_dbg(&md->spi->dev,  in panel_enabled()
466 	md->fbdev = fbdev;  in mipid_init()
467 	INIT_DELAYED_WORK(&md->esd_work, mipid_esd_work);  in mipid_init()
468 	mutex_init(&md->mutex);  in mipid_init()
470 	md->enabled = panel_enabled(md);  in mipid_init()
472 	if (md->enabled)  in mipid_init()
475 		md->saved_bklight_level = mipid_get_bklight_level(panel);  in mipid_init()
484 	if (md->enabled)  in mipid_cleanup()
518 	pdata = md->spi->dev.platform_data;  in mipid_detect()
520 		dev_err(&md->spi->dev, "missing platform data\n");  in mipid_detect()
521 		return -ENOENT;  in mipid_detect()
525 	dev_dbg(&md->spi->dev, "MIPI display ID: %02x%02x%02x\n",  in mipid_detect()
530 		md->panel.name = "lph8923";  in mipid_detect()
533 		md->panel.name = "ls041y3";  in mipid_detect()
534 		md->esd_check = ls041y3_esd_check;  in mipid_detect()
537 		md->panel.name = "unknown";  in mipid_detect()
538 		dev_err(&md->spi->dev, "invalid display ID\n");  in mipid_detect()
539 		return -ENODEV;  in mipid_detect()
542 	md->revision = display_id[1];  in mipid_detect()
543 	md->panel.data_lines = pdata->data_lines;  in mipid_detect()
545 			md->panel.name, md->revision, md->panel.data_lines);  in mipid_detect()
557 		dev_err(&spi->dev, "out of memory\n");  in mipid_spi_probe()
558 		return -ENOMEM;  in mipid_spi_probe()
561 	/* This will de-assert RESET if active */  in mipid_spi_probe()
562 	md->reset = gpiod_get(&spi->dev, "reset", GPIOD_OUT_LOW);  in mipid_spi_probe()
563 	if (IS_ERR(md->reset))  in mipid_spi_probe()
564 		return dev_err_probe(&spi->dev, PTR_ERR(md->reset),  in mipid_spi_probe()
567 	spi->mode = SPI_MODE_0;  in mipid_spi_probe()
568 	md->spi = spi;  in mipid_spi_probe()
569 	dev_set_drvdata(&spi->dev, md);  in mipid_spi_probe()
570 	md->panel = mipid_panel;  in mipid_spi_probe()
576 	omapfb_register_panel(&md->panel);  in mipid_spi_probe()
587 	struct mipid_device *md = dev_get_drvdata(&spi->dev);  in mipid_spi_remove()
589 	/* Asserts RESET */  in mipid_spi_remove()
590 	gpiod_set_value(md->reset, 1);  in mipid_spi_remove()
591 	mipid_disable(&md->panel);  in mipid_spi_remove()