1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * wm9705.c  --  Codec driver for Wolfson WM9705 AC97 Codec.
16 #include <linux/delay.h>
35  * This is used to increase the range of values returned by the adc
52  * Set adc sample delay.
56  * touchpanel plate and the ADC sampling the signal.
58  * This delay can be set by setting delay = n, where n is the array
59  * position of the delay in the array delay_table below.
60  * Long delays > 1ms are supported for completeness, but are not
63 static int delay = 4;  variable
64 module_param(delay, int, 0);
65 MODULE_PARM_DESC(delay, "Set adc sample delay.");
82  * Set adc mask function.
86  * order to minimise this, a signal may be applied to the MASK pin to delay or
89  * 0 = No delay or sync
91  * 2 = Edge triggered, edge on pin delays conversion by delay param (above)
92  * 3 = Edge triggered, edge on pin starts conversion after delay param
96 MODULE_PARM_DESC(mask, "Set adc mask function.");
99  * ADC sample delay times in uS
117 	0      /* No delay, switch matrix always on */
121  * Delay after issuing a POLL command.
123  * The delay is 3 AC97 link frames + the touchpanel settling delay
147 		dev_dbg(wm->dev,  in wm9705_phy_init()
150 		dev_dbg(wm->dev,  in wm9705_phy_init()
155 	/* polling mode sample settling delay */  in wm9705_phy_init()
156 	if (delay != 4) {  in wm9705_phy_init()
157 		if (delay < 0 || delay > 15) {  in wm9705_phy_init()
158 			dev_dbg(wm->dev, "supplied delay out of range.");  in wm9705_phy_init()
159 			delay = 4;  in wm9705_phy_init()
163 	dig1 |= WM97XX_DELAY(delay);  in wm9705_phy_init()
164 	dev_dbg(wm->dev, "setting adc sample delay to %d u Secs.",  in wm9705_phy_init()
165 		delay_table[delay]);  in wm9705_phy_init()
169 	dev_dbg(wm->dev, "setting pdd to Vmid/%d", 1 - (pdd & 0x000f));  in wm9705_phy_init()
182 				 wm->dig[2] | WM97XX_PRP_DET_DIG);  in wm9705_dig_enable()
186 				 wm->dig[2] & ~WM97XX_PRP_DET_DIG);  in wm9705_dig_enable()
191 	memcpy(wm->dig_save, wm->dig, sizeof(wm->dig));  in wm9705_aux_prepare()
198 	wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER1, wm->dig_save[1]);  in wm9705_dig_restore()
199 	wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER2, wm->dig_save[2]);  in wm9705_dig_restore()
204 	return wm->dig[2] & WM9705_PDEN;  in is_pden()
208  * Read a sample from the WM9705 adc in polling mode.
212 	int timeout = 5 * delay;  in wm9705_poll_sample()
215 	if (wants_pen && !wm->pen_probably_down) {  in wm9705_poll_sample()
219 		wm->pen_probably_down = 1;  in wm9705_poll_sample()
223 	if (wm->mach_ops && wm->mach_ops->pre_sample)  in wm9705_poll_sample()
224 		wm->mach_ops->pre_sample(adcsel);  in wm9705_poll_sample()
226 				| WM97XX_POLL | WM97XX_DELAY(delay));  in wm9705_poll_sample()
228 	/* wait 3 AC97 time slots + delay for conversion */  in wm9705_poll_sample()
229 	poll_delay(delay);  in wm9705_poll_sample()
235 		timeout--;  in wm9705_poll_sample()
241 			wm->pen_probably_down = 0;  in wm9705_poll_sample()
243 			dev_dbg(wm->dev, "adc sample timeout");  in wm9705_poll_sample()
248 	if (wm->mach_ops && wm->mach_ops->post_sample)  in wm9705_poll_sample()
249 		wm->mach_ops->post_sample(adcsel);  in wm9705_poll_sample()
253 		dev_dbg(wm->dev, "adc wrong sample, wanted %x got %x",  in wm9705_poll_sample()
260 		wm->pen_probably_down = 0;  in wm9705_poll_sample()
274 	rc = wm9705_poll_sample(wm, WM97XX_ADCSEL_X | WM97XX_PEN_DOWN, &data->x);  in wm9705_poll_touch()
277 	rc = wm9705_poll_sample(wm, WM97XX_ADCSEL_Y | WM97XX_PEN_DOWN, &data->y);  in wm9705_poll_touch()
281 		rc = wm9705_poll_sample(wm, WM97XX_ADCSEL_PRES | WM97XX_PEN_DOWN, &data->p);  in wm9705_poll_touch()
285 		data->p = DEFAULT_PRESSURE;  in wm9705_poll_touch()
299 	dig1 = wm->dig[1];  in wm9705_acc_enable()
300 	dig2 = wm->dig[2];  in wm9705_acc_enable()
304 		if (wm->mach_ops->acc_startup &&  in wm9705_acc_enable()
305 		    (ret = wm->mach_ops->acc_startup(wm)) < 0)  in wm9705_acc_enable()
310 			WM97XX_DELAY(delay) |  in wm9705_acc_enable()
311 			WM97XX_SLT(wm->acc_slot) |  in wm9705_acc_enable()
312 			WM97XX_RATE(wm->acc_rate);  in wm9705_acc_enable()
319 		if (wm->mach_ops->acc_shutdown)  in wm9705_acc_enable()
320 			wm->mach_ops->acc_shutdown(wm);  in wm9705_acc_enable()