1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * wm9712.c  --  Codec driver for Wolfson WM9712 AC97 Codecs.
69  * touchpanel plate and the ADC sampling the signal.
87 MODULE_PARM_DESC(five_wire, "Set to '1' to use 5-wire touchscreen.");
92  * Sources of glitch noise, such as signals driving an LCD display, may feed
94  * order to minimise this, a signal may be applied to the MASK pin to delay or
120 	21,    /* 1 AC97 Link frames */
141  * The delay is 3 AC97 link frames + the touchpanel settling delay
160 		dev_dbg(wm->dev, "setting pen detect pull-up to %d Ohms\n",  in wm9712_phy_init()
167 		dev_dbg(wm->dev, "setting 5-wire touchscreen mode.\n");  in wm9712_phy_init()
170 			dev_warn(wm->dev, "pressure measurement is not "  in wm9712_phy_init()
171 				 "supported in 5-wire mode\n");  in wm9712_phy_init()
179 		dev_dbg(wm->dev,  in wm9712_phy_init()
182 		dev_dbg(wm->dev,  in wm9712_phy_init()
189 		dev_dbg(wm->dev, "supplied delay out of range.\n");  in wm9712_phy_init()
194 	dev_dbg(wm->dev, "setting adc sample delay to %d u Secs.\n",  in wm9712_phy_init()
208 	/* wait - coord mode */  in wm9712_phy_init()
218 	u16 dig2 = wm->dig[2];  in wm9712_dig_enable()
231 	memcpy(wm->dig_save, wm->dig, sizeof(wm->dig));  in wm9712_aux_prepare()
238 	wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER1, wm->dig_save[1]);  in wm9712_dig_restore()
239 	wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER2, wm->dig_save[2]);  in wm9712_dig_restore()
244 	return wm->dig[2] & WM9712_PDEN;  in is_pden()
255 	if (wants_pen && !wm->pen_probably_down) {  in wm9712_poll_sample()
259 		wm->pen_probably_down = 1;  in wm9712_poll_sample()
263 	if (wm->mach_ops && wm->mach_ops->pre_sample)  in wm9712_poll_sample()
264 		wm->mach_ops->pre_sample(adcsel);  in wm9712_poll_sample()
275 		timeout--;  in wm9712_poll_sample()
281 			wm->pen_probably_down = 0;  in wm9712_poll_sample()
283 			dev_dbg(wm->dev, "adc sample timeout\n");  in wm9712_poll_sample()
288 	if (wm->mach_ops && wm->mach_ops->post_sample)  in wm9712_poll_sample()
289 		wm->mach_ops->post_sample(adcsel);  in wm9712_poll_sample()
293 		dev_dbg(wm->dev, "adc wrong sample, wanted %x got %x\n",  in wm9712_poll_sample()
303 			wm->pen_probably_down = 0;  in wm9712_poll_sample()
318 	if (!wm->pen_probably_down) {  in wm9712_poll_coord()
322 		wm->pen_probably_down = 1;  in wm9712_poll_coord()
326 	if (wm->mach_ops && wm->mach_ops->pre_sample)  in wm9712_poll_coord()
327 		wm->mach_ops->pre_sample(WM97XX_ADCSEL_X | WM97XX_ADCSEL_Y);  in wm9712_poll_coord()
334 	data->x = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD);  in wm9712_poll_coord()
339 		timeout--;  in wm9712_poll_coord()
345 			wm->pen_probably_down = 0;  in wm9712_poll_coord()
347 			dev_dbg(wm->dev, "adc sample timeout\n");  in wm9712_poll_coord()
352 	data->y = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD);  in wm9712_poll_coord()
354 		data->p = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD);  in wm9712_poll_coord()
356 		data->p = DEFAULT_PRESSURE;  in wm9712_poll_coord()
358 	if (wm->mach_ops && wm->mach_ops->post_sample)  in wm9712_poll_coord()
359 		wm->mach_ops->post_sample(WM97XX_ADCSEL_X | WM97XX_ADCSEL_Y);  in wm9712_poll_coord()
362 	if (!(data->x & WM97XX_ADCSEL_X) || !(data->y & WM97XX_ADCSEL_Y))  in wm9712_poll_coord()
364 	if (pil && !(data->p & WM97XX_ADCSEL_PRES))  in wm9712_poll_coord()
367 	if (!(data->x & WM97XX_PEN_DOWN) || !(data->y & WM97XX_PEN_DOWN)) {  in wm9712_poll_coord()
368 		wm->pen_probably_down = 0;  in wm9712_poll_coord()
389 					&data->x);  in wm9712_poll_touch()
394 					&data->y);  in wm9712_poll_touch()
400 						&data->p);  in wm9712_poll_touch()
404 			data->p = DEFAULT_PRESSURE;  in wm9712_poll_touch()
418 	dig1 = wm->dig[1];  in wm9712_acc_enable()
419 	dig2 = wm->dig[2];  in wm9712_acc_enable()
423 		if (wm->mach_ops->acc_startup) {  in wm9712_acc_enable()
424 			ret = wm->mach_ops->acc_startup(wm);  in wm9712_acc_enable()
432 			WM97XX_SLT(wm->acc_slot) |  in wm9712_acc_enable()
433 			WM97XX_RATE(wm->acc_rate);  in wm9712_acc_enable()
440 		if (wm->mach_ops->acc_shutdown)  in wm9712_acc_enable()
441 			wm->mach_ops->acc_shutdown(wm);  in wm9712_acc_enable()