1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * mainstone-wm97xx.c  --  Mainstone Continuous Touch screen driver for
16  *       - codecs supported:- WM9705, WM9712, WM9713
17  *       - processors supported:- Intel XScale PXA25x, PXA26x, PXA27x
31 #include <sound/pxa2xx-lib.h>
33 #include <asm/mach-types.h>
64  * Pen sampling frequency (Hz) in continuous mode.
71  * Pen down detection.
73  * This driver can either poll or use an interrupt to indicate a pen down
78 MODULE_PARM_DESC(pen_int, "Pen down detection (1 = interrupt, 0 = polling)");
83  * Set to 1 to read back pen down pressure
122 	 * to buffer up samples otherwise we end up spinning polling  in wm97xx_acc_pen_down()
146 		dev_dbg(wm->dev, "Raw coordinates: x=%x, y=%x, p=%x\n",  in wm97xx_acc_pen_down()
153 			goto up;  in wm97xx_acc_pen_down()
157 		input_report_abs(wm->input_dev, ABS_X, x & 0xfff);  in wm97xx_acc_pen_down()
158 		input_report_abs(wm->input_dev, ABS_Y, y & 0xfff);  in wm97xx_acc_pen_down()
159 		input_report_abs(wm->input_dev, ABS_PRESSURE, p & 0xfff);  in wm97xx_acc_pen_down()
160 		input_report_key(wm->input_dev, BTN_TOUCH, (p != 0));  in wm97xx_acc_pen_down()
161 		input_sync(wm->input_dev);  in wm97xx_acc_pen_down()
164 up:  in wm97xx_acc_pen_down()
173 	if (wm->ac97 == NULL)  in wm97xx_acc_startup()
174 		return -ENODEV;  in wm97xx_acc_startup()
178 		if (wm->id != cinfo[idx].id)  in wm97xx_acc_startup()
184 	wm->acc_rate = cinfo[sp_idx].code;  in wm97xx_acc_startup()
185 	wm->acc_slot = ac97_touch_slot;  in wm97xx_acc_startup()
186 	dev_info(wm->dev,  in wm97xx_acc_startup()
191 		gpiod_irq = gpiod_get(wm->dev, "touch", GPIOD_IN);  in wm97xx_acc_startup()
197 		wm->pen_irq = gpiod_to_irq(gpiod_irq);  in wm97xx_acc_startup()
198 		irq_set_irq_type(wm->pen_irq, IRQ_TYPE_EDGE_BOTH);  in wm97xx_acc_startup()
203 		switch (wm->id) {  in wm97xx_acc_startup()
219 			dev_err(wm->dev,  in wm97xx_acc_startup()
220 				"pen down irq not supported on this device\n");  in wm97xx_acc_startup()
235 		wm->pen_irq = 0;  in wm97xx_acc_shutdown()
266 		.name	= "wm97xx-touch",