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
24 #include <linux/irq.h>
30 #include <mach/regs-ac97.h>
32 #include <asm/mach-types.h>
35 	u16 id;    /* codec id */
61 static int irq;  variable
74  * event. If the irq request fails then it will fall back to polling mode.
150 		dev_dbg(wm->dev, "Raw coordinates: x=%x, y=%x, p=%x\n",  in wm97xx_acc_pen_down()
161 		input_report_abs(wm->input_dev, ABS_X, x & 0xfff);  in wm97xx_acc_pen_down()
162 		input_report_abs(wm->input_dev, ABS_Y, y & 0xfff);  in wm97xx_acc_pen_down()
163 		input_report_abs(wm->input_dev, ABS_PRESSURE, p & 0xfff);  in wm97xx_acc_pen_down()
164 		input_report_key(wm->input_dev, BTN_TOUCH, (p != 0));  in wm97xx_acc_pen_down()
165 		input_sync(wm->input_dev);  in wm97xx_acc_pen_down()
176 	/* check we have a codec */  in wm97xx_acc_startup()
177 	if (wm->ac97 == NULL)  in wm97xx_acc_startup()
178 		return -ENODEV;  in wm97xx_acc_startup()
182 		if (wm->id != cinfo[idx].id)  in wm97xx_acc_startup()
188 	wm->acc_rate = cinfo[sp_idx].code;  in wm97xx_acc_startup()
189 	wm->acc_slot = ac97_touch_slot;  in wm97xx_acc_startup()
190 	dev_info(wm->dev,  in wm97xx_acc_startup()
194 	/* IRQ driven touchscreen is used on Palm hardware */  in wm97xx_acc_startup()
197 		irq = 27;  in wm97xx_acc_startup()
200 		wm->variant = WM97xx_WM1613;  in wm97xx_acc_startup()
202 		irq = 4;  in wm97xx_acc_startup()
204 	if (irq) {  in wm97xx_acc_startup()
205 		ret = gpio_request(irq, "Touchscreen IRQ");  in wm97xx_acc_startup()
209 		ret = gpio_direction_input(irq);  in wm97xx_acc_startup()
211 			gpio_free(irq);  in wm97xx_acc_startup()
215 		wm->pen_irq = gpio_to_irq(irq);  in wm97xx_acc_startup()
216 		irq_set_irq_type(wm->pen_irq, IRQ_TYPE_EDGE_BOTH);  in wm97xx_acc_startup()
217 	} else /* pen irq not supported */  in wm97xx_acc_startup()
220 	/* codec specific irq config */  in wm97xx_acc_startup()
222 		switch (wm->id) {  in wm97xx_acc_startup()
227 			/* use PEN_DOWN GPIO 13 to assert IRQ on GPIO line 2 */  in wm97xx_acc_startup()
238 			dev_err(wm->dev,  in wm97xx_acc_startup()
239 				"pen down irq not supported on this device\n");  in wm97xx_acc_startup()
251 	/* codec specific deconfig */  in wm97xx_acc_shutdown()
253 		if (irq)  in wm97xx_acc_shutdown()
254 			gpio_free(irq);  in wm97xx_acc_shutdown()
255 		wm->pen_irq = 0;  in wm97xx_acc_shutdown()
262 		enable_irq(wm->pen_irq);  in wm97xx_irq_enable()
264 		disable_irq_nosync(wm->pen_irq);  in wm97xx_irq_enable()
296 		.name = "wm97xx-touch",