1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * wm9713.c  --  Codec touch driver for Wolfson WM9713 AC97 Codec.
32  * i.e. pull up resistance = 64k Ohms / rpu.
69  * touchpanel plate and the ADC sampling the signal.
81  * Set five_wire = 1 to use a 5 wire touchscreen.
87 MODULE_PARM_DESC(five_wire, "Set to '1' to use 5-wire touchscreen.");
109  * Set to 1 to enable coordinate polling. e.g. x,y[,p] is sampled together
163 		dev_info(wm->dev, "setting pen detect pull-up to %d Ohms\n",  in wm9713_phy_init()
170 		dev_info(wm->dev, "setting 5-wire touchscreen mode.");  in wm9713_phy_init()
173 			dev_warn(wm->dev,  in wm9713_phy_init()
183 		dev_info(wm->dev,  in wm9713_phy_init()
186 		dev_info(wm->dev,  in wm9713_phy_init()
193 		dev_info(wm->dev, "supplied delay out of range.");  in wm9713_phy_init()
195 		dev_info(wm->dev, "setting adc sample delay to %d u Secs.",  in wm9713_phy_init()
206 	wm->misc = wm97xx_reg_read(wm, 0x5a);  in wm9713_phy_init()
221 		wm97xx_reg_write(wm, AC97_WM9713_DIG3, wm->dig[2] |  in wm9713_dig_enable()
225 		wm97xx_reg_write(wm, AC97_WM9713_DIG3, wm->dig[2] &  in wm9713_dig_enable()
234 	wm97xx_reg_write(wm, AC97_WM9713_DIG1, wm->dig_save[0]);  in wm9713_dig_restore()
235 	wm97xx_reg_write(wm, AC97_WM9713_DIG2, wm->dig_save[1]);  in wm9713_dig_restore()
236 	wm97xx_reg_write(wm, AC97_WM9713_DIG3, wm->dig_save[2]);  in wm9713_dig_restore()
241 	memcpy(wm->dig_save, wm->dig, sizeof(wm->dig));  in wm9713_aux_prepare()
249 	return wm->dig[2] & WM9713_PDEN;  in is_pden()
261 	if (wants_pen && !wm->pen_probably_down) {  in wm9713_poll_sample()
265 		wm->pen_probably_down = 1;  in wm9713_poll_sample()
274 	if (wm->mach_ops && wm->mach_ops->pre_sample)  in wm9713_poll_sample()
275 		wm->mach_ops->pre_sample(adcsel);  in wm9713_poll_sample()
285 		timeout--;  in wm9713_poll_sample()
291 			wm->pen_probably_down = 0;  in wm9713_poll_sample()
293 			dev_dbg(wm->dev, "adc sample timeout");  in wm9713_poll_sample()
298 	if (wm->mach_ops && wm->mach_ops->post_sample)  in wm9713_poll_sample()
299 		wm->mach_ops->post_sample(adcsel);  in wm9713_poll_sample()
303 		dev_dbg(wm->dev, "adc wrong sample, wanted %x got %x",  in wm9713_poll_sample()
310 		wm->pen_probably_down = 0;  in wm9713_poll_sample()
325 	if (!wm->pen_probably_down) {  in wm9713_poll_coord()
329 		wm->pen_probably_down = 1;  in wm9713_poll_coord()
338 	if (wm->mach_ops && wm->mach_ops->pre_sample)  in wm9713_poll_coord()
339 		wm->mach_ops->pre_sample(WM97XX_ADCSEL_X | WM97XX_ADCSEL_Y);  in wm9713_poll_coord()
345 	data->x = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD);  in wm9713_poll_coord()
350 		timeout--;  in wm9713_poll_coord()
356 			wm->pen_probably_down = 0;  in wm9713_poll_coord()
358 			dev_dbg(wm->dev, "adc sample timeout");  in wm9713_poll_coord()
363 	data->y = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD);  in wm9713_poll_coord()
365 		data->p = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD);  in wm9713_poll_coord()
367 		data->p = DEFAULT_PRESSURE;  in wm9713_poll_coord()
369 	if (wm->mach_ops && wm->mach_ops->post_sample)  in wm9713_poll_coord()
370 		wm->mach_ops->post_sample(WM97XX_ADCSEL_X | WM97XX_ADCSEL_Y);  in wm9713_poll_coord()
373 	if (!(data->x & WM97XX_ADCSEL_X) || !(data->y & WM97XX_ADCSEL_Y))  in wm9713_poll_coord()
375 	if (pil && !(data->p & WM97XX_ADCSEL_PRES))  in wm9713_poll_coord()
378 	if (!(data->x & WM97XX_PEN_DOWN) || !(data->y & WM97XX_PEN_DOWN)) {  in wm9713_poll_coord()
379 		wm->pen_probably_down = 0;  in wm9713_poll_coord()
388  * Sample the WM9713 touchscreen in polling mode
399 		rc = wm9713_poll_sample(wm, WM97XX_ADCSEL_X | WM97XX_PEN_DOWN, &data->x);  in wm9713_poll_touch()
402 		rc = wm9713_poll_sample(wm, WM97XX_ADCSEL_Y | WM97XX_PEN_DOWN, &data->y);  in wm9713_poll_touch()
407 						&data->p);  in wm9713_poll_touch()
411 			data->p = DEFAULT_PRESSURE;  in wm9713_poll_touch()
425 	dig1 = wm->dig[0];  in wm9713_acc_enable()
426 	dig2 = wm->dig[1];  in wm9713_acc_enable()
427 	dig3 = wm->dig[2];  in wm9713_acc_enable()
431 		if (wm->mach_ops->acc_startup &&  in wm9713_acc_enable()
432 			(ret = wm->mach_ops->acc_startup(wm)) < 0)  in wm9713_acc_enable()
443 		WM97XX_SLT(wm->acc_slot) | WM97XX_RATE(wm->acc_rate);  in wm9713_acc_enable()
449 		if (wm->mach_ops->acc_shutdown)  in wm9713_acc_enable()
450 			wm->mach_ops->acc_shutdown(wm);  in wm9713_acc_enable()