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()
201 	struct device *dev = &pdev->dev;  in lpc32xx_ts_probe()
213 		return -ENOMEM;  in lpc32xx_ts_probe()
215 	tsc->irq = irq;  in lpc32xx_ts_probe()
217 	tsc->tsc_base = devm_platform_ioremap_resource(pdev, 0);  in lpc32xx_ts_probe()
218 	if (IS_ERR(tsc->tsc_base))  in lpc32xx_ts_probe()
219 		return PTR_ERR(tsc->tsc_base);  in lpc32xx_ts_probe()
221 	tsc->clk = devm_clk_get(dev, NULL);  in lpc32xx_ts_probe()
222 	if (IS_ERR(tsc->clk)) {  in lpc32xx_ts_probe()
223 		dev_err(&pdev->dev, "failed getting clock\n");  in lpc32xx_ts_probe()
224 		return PTR_ERR(tsc->clk);  in lpc32xx_ts_probe()
229 		dev_err(&pdev->dev, "failed allocating input device\n");  in lpc32xx_ts_probe()
230 		return -ENOMEM;  in lpc32xx_ts_probe()
233 	input->name = MOD_NAME;  in lpc32xx_ts_probe()
234 	input->phys = "lpc32xx/input0";  in lpc32xx_ts_probe()
235 	input->id.bustype = BUS_HOST;  in lpc32xx_ts_probe()
236 	input->id.vendor = 0x0001;  in lpc32xx_ts_probe()
237 	input->id.product = 0x0002;  in lpc32xx_ts_probe()
238 	input->id.version = 0x0100;  in lpc32xx_ts_probe()
239 	input->open = lpc32xx_ts_open;  in lpc32xx_ts_probe()
240 	input->close = lpc32xx_ts_close;  in lpc32xx_ts_probe()
249 	tsc->dev = input;  in lpc32xx_ts_probe()
251 	error = devm_request_irq(dev, tsc->irq, lpc32xx_ts_interrupt,  in lpc32xx_ts_probe()
252 				 0, pdev->name, tsc);  in lpc32xx_ts_probe()
254 		dev_err(&pdev->dev, "failed requesting interrupt\n");  in lpc32xx_ts_probe()
260 		dev_err(&pdev->dev, "failed registering input device\n");  in lpc32xx_ts_probe()
265 	device_init_wakeup(&pdev->dev, true);  in lpc32xx_ts_probe()
274 	struct input_dev *input = tsc->dev;  in lpc32xx_ts_suspend()
282 	mutex_lock(&input->mutex);  in lpc32xx_ts_suspend()
286 			enable_irq_wake(tsc->irq);  in lpc32xx_ts_suspend()
291 	mutex_unlock(&input->mutex);  in lpc32xx_ts_suspend()
299 	struct input_dev *input = tsc->dev;  in lpc32xx_ts_resume()
301 	mutex_lock(&input->mutex);  in lpc32xx_ts_resume()
305 			disable_irq_wake(tsc->irq);  in lpc32xx_ts_resume()
310 	mutex_unlock(&input->mutex);  in lpc32xx_ts_resume()
326 	{ .compatible = "nxp,lpc3220-tsc", },