1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * LPC32xx built-in touchscreen driver
18  * Touchscreen controller register offsets
43 #define LPC32XX_TSC_ADCCON_X_SAMPLE_SIZE(s)	((10 - (s)) << 7)
44 #define LPC32XX_TSC_ADCCON_Y_SAMPLE_SIZE(s)	((10 - (s)) << 4)
57 #define MOD_NAME "ts-lpc32xx"
60 	__raw_readl((dev)->tsc_base + (reg))
62 	__raw_writel((val), (dev)->tsc_base + (reg))
83 	struct input_dev *input = tsc->dev;  in lpc32xx_ts_interrupt()
88 		/* FIFO overflow - throw away samples */  in lpc32xx_ts_interrupt()
94 	 * Gather and normalize 4 samples. Pen-up events may have less  in lpc32xx_ts_interrupt()
95 	 * than 4 samples, but its ok to pop 4 and let the last sample  in lpc32xx_ts_interrupt()
96 	 * pen status check drop the samples.  in lpc32xx_ts_interrupt()
103 		xs[idx] = LPC32XX_TSC_ADCDAT_VALUE_MASK -  in lpc32xx_ts_interrupt()
105 		ys[idx] = LPC32XX_TSC_ADCDAT_VALUE_MASK -  in lpc32xx_ts_interrupt()
113 		/* Use average of 2nd and 3rd sample for position */  in lpc32xx_ts_interrupt()
133 	clk_disable_unprepare(tsc->clk);  in lpc32xx_stop_tsc()
141 	err = clk_prepare_enable(tsc->clk);  in lpc32xx_setup_tsc()
147 	/* Set the TSC FIFO depth to 4 samples @ 10-bits per sample (max) */  in lpc32xx_setup_tsc()
210 		dev_err(&pdev->dev, "Can't get memory resource\n");  in lpc32xx_ts_probe()
211 		return -ENOENT;  in lpc32xx_ts_probe()
221 		dev_err(&pdev->dev, "failed allocating memory\n");  in lpc32xx_ts_probe()
222 		error = -ENOMEM;  in lpc32xx_ts_probe()
226 	tsc->dev = input;  in lpc32xx_ts_probe()
227 	tsc->irq = irq;  in lpc32xx_ts_probe()
231 	if (!request_mem_region(res->start, size, pdev->name)) {  in lpc32xx_ts_probe()
232 		dev_err(&pdev->dev, "TSC registers are not free\n");  in lpc32xx_ts_probe()
233 		error = -EBUSY;  in lpc32xx_ts_probe()
237 	tsc->tsc_base = ioremap(res->start, size);  in lpc32xx_ts_probe()
238 	if (!tsc->tsc_base) {  in lpc32xx_ts_probe()
239 		dev_err(&pdev->dev, "Can't map memory\n");  in lpc32xx_ts_probe()
240 		error = -ENOMEM;  in lpc32xx_ts_probe()
244 	tsc->clk = clk_get(&pdev->dev, NULL);  in lpc32xx_ts_probe()
245 	if (IS_ERR(tsc->clk)) {  in lpc32xx_ts_probe()
246 		dev_err(&pdev->dev, "failed getting clock\n");  in lpc32xx_ts_probe()
247 		error = PTR_ERR(tsc->clk);  in lpc32xx_ts_probe()
251 	input->name = MOD_NAME;  in lpc32xx_ts_probe()
252 	input->phys = "lpc32xx/input0";  in lpc32xx_ts_probe()
253 	input->id.bustype = BUS_HOST;  in lpc32xx_ts_probe()
254 	input->id.vendor = 0x0001;  in lpc32xx_ts_probe()
255 	input->id.product = 0x0002;  in lpc32xx_ts_probe()
256 	input->id.version = 0x0100;  in lpc32xx_ts_probe()
257 	input->dev.parent = &pdev->dev;  in lpc32xx_ts_probe()
258 	input->open = lpc32xx_ts_open;  in lpc32xx_ts_probe()
259 	input->close = lpc32xx_ts_close;  in lpc32xx_ts_probe()
261 	input->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);  in lpc32xx_ts_probe()
262 	input->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);  in lpc32xx_ts_probe()
270 	error = request_irq(tsc->irq, lpc32xx_ts_interrupt,  in lpc32xx_ts_probe()
271 			    0, pdev->name, tsc);  in lpc32xx_ts_probe()
273 		dev_err(&pdev->dev, "failed requesting interrupt\n");  in lpc32xx_ts_probe()
279 		dev_err(&pdev->dev, "failed registering input device\n");  in lpc32xx_ts_probe()
284 	device_init_wakeup(&pdev->dev, 1);  in lpc32xx_ts_probe()
289 	free_irq(tsc->irq, tsc);  in lpc32xx_ts_probe()
291 	clk_put(tsc->clk);  in lpc32xx_ts_probe()
293 	iounmap(tsc->tsc_base);  in lpc32xx_ts_probe()
295 	release_mem_region(res->start, size);  in lpc32xx_ts_probe()
308 	free_irq(tsc->irq, tsc);  in lpc32xx_ts_remove()
310 	input_unregister_device(tsc->dev);  in lpc32xx_ts_remove()
312 	clk_put(tsc->clk);  in lpc32xx_ts_remove()
314 	iounmap(tsc->tsc_base);  in lpc32xx_ts_remove()
316 	release_mem_region(res->start, resource_size(res));  in lpc32xx_ts_remove()
327 	struct input_dev *input = tsc->dev;  in lpc32xx_ts_suspend()
335 	mutex_lock(&input->mutex);  in lpc32xx_ts_suspend()
337 	if (input->users) {  in lpc32xx_ts_suspend()
339 			enable_irq_wake(tsc->irq);  in lpc32xx_ts_suspend()
344 	mutex_unlock(&input->mutex);  in lpc32xx_ts_suspend()
352 	struct input_dev *input = tsc->dev;  in lpc32xx_ts_resume()
354 	mutex_lock(&input->mutex);  in lpc32xx_ts_resume()
356 	if (input->users) {  in lpc32xx_ts_resume()
358 			disable_irq_wake(tsc->irq);  in lpc32xx_ts_resume()
363 	mutex_unlock(&input->mutex);  in lpc32xx_ts_resume()
379 	{ .compatible = "nxp,lpc3220-tsc", },