1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * Samsung S3C24XX touchscreen driver
5  * Copyright 2004 Arnaud Patard <arnaud.patard@rtp-net.org>
6  * Copyright 2008 Ben Dooks <ben-linux@fluff.org>
23 #include <linux/soc/samsung/s3c-adc.h>
24 #include <linux/platform_data/touchscreen-s3c2410.h>
76 #define FEAT_PEN_IRQ	(1 << 0)	/* HAS ADCCLRINTPNDNUP */
78 /* Per-touchscreen data. */
81  * struct s3c2410ts - driver touchscreen state.
111  * get_down - return the down state of the pen
115  * Return non-zero if both readings show that the pen is down.
170  * stylus_irq - touchscreen stylus event interrupt
205  * s3c24xx_ts_conversion - ADC conversion callback
211  * Called when a conversion has finished.
224 	/* From tests, it seems that it is unlikely to get a pen-up  in s3c24xx_ts_conversion()
226 	 * ignore any pen-up events with less than the requisite  in s3c24xx_ts_conversion()
229 	 * In several thousand conversions, no pen-ups where detected  in s3c24xx_ts_conversion()
235  * s3c24xx_ts_select - ADC selection callback.
253  * s3c2410ts_probe - device core probe entry point
262 	struct device *dev = &pdev->dev;  in s3c2410ts_probe()
265 	int ret = -EINVAL;  in s3c2410ts_probe()
275 		return -EINVAL;  in s3c2410ts_probe()
278 	dev_dbg(dev, "initialising touchscreen\n");  in s3c2410ts_probe()
283 		return -ENOENT;  in s3c2410ts_probe()
302 		ret = -ENOENT;  in s3c2410ts_probe()
306 	ts.io = ioremap(res->start, resource_size(res));  in s3c2410ts_probe()
309 		ret = -ENOMEM;  in s3c2410ts_probe()
314 	if (info->cfg_gpio)  in s3c2410ts_probe()
315 		info->cfg_gpio(to_platform_device(ts.dev));  in s3c2410ts_probe()
326 	if ((info->delay & 0xffff) > 0)  in s3c2410ts_probe()
327 		writel(info->delay & 0xffff, ts.io + S3C2410_ADCDLY);  in s3c2410ts_probe()
334 		ret = -ENOMEM;  in s3c2410ts_probe()
339 	ts.input->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);  in s3c2410ts_probe()
340 	ts.input->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);  in s3c2410ts_probe()
344 	ts.input->name = "S3C24XX TouchScreen";  in s3c2410ts_probe()
345 	ts.input->id.bustype = BUS_HOST;  in s3c2410ts_probe()
346 	ts.input->id.vendor = 0xDEAD;  in s3c2410ts_probe()
347 	ts.input->id.product = 0xBEEF;  in s3c2410ts_probe()
348 	ts.input->id.version = 0x0102;  in s3c2410ts_probe()
350 	ts.shift = info->oversampling_shift;  in s3c2410ts_probe()
351 	ts.features = platform_get_device_id(pdev)->driver_data;  in s3c2410ts_probe()
366 		ret = -EIO;  in s3c2410ts_probe()
387  * s3c2410ts_remove - device core removal entry point
419 	struct s3c2410_ts_mach_info *info = dev_get_platdata(&pdev->dev);  in s3c2410ts_resume()
425 	if ((info->delay & 0xffff) > 0)  in s3c2410ts_resume()
426 		writel(info->delay & 0xffff, ts.io + S3C2410_ADCDLY);  in s3c2410ts_resume()
440 	{ "s3c2410-ts", 0 },
441 	{ "s3c2440-ts", 0 },
442 	{ "s3c64xx-ts", FEAT_PEN_IRQ },
449 		.name   = "samsung-ts",
460 MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>, "
463 MODULE_DESCRIPTION("S3C24XX Touchscreen driver");