1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * wm9705.c  --  Codec driver for Wolfson WM9705 AC97 Codec.
38 static int pil;
39 module_param(pil, int, 0);
43  * Set threshold for pressure measurement.
45  * Pen down pressure below threshold is ignored.
47 static int pressure = DEFAULT_PRESSURE & 0xfff;
48 module_param(pressure, int, 0);
49 MODULE_PARM_DESC(pressure, "Set threshold for pressure measurement.");
63 static int delay = 4;
64 module_param(delay, int, 0);
68  * Pen detect comparator threshold.
70  * 0 to Vmid in 15 steps, 0 = use zero power comparator with Vmid threshold
71  * i.e. 1 =  Vmid/15 threshold
72  *      15 =  Vmid/1 threshold
77 static int pdd = 8;
78 module_param(pdd, int, 0);
79 MODULE_PARM_DESC(pdd, "Set pen detect comparator threshold");
94 static int mask;
95 module_param(mask, int, 0);
101 static const int delay_table[] = {
125 static inline void poll_delay(int d)  in poll_delay()
147 		dev_dbg(wm->dev,  in wm9705_phy_init()
150 		dev_dbg(wm->dev,  in wm9705_phy_init()
158 			dev_dbg(wm->dev, "supplied delay out of range.");  in wm9705_phy_init()
164 	dev_dbg(wm->dev, "setting adc sample delay to %d u Secs.",  in wm9705_phy_init()
169 	dev_dbg(wm->dev, "setting pdd to Vmid/%d", 1 - (pdd & 0x000f));  in wm9705_phy_init()
178 static void wm9705_dig_enable(struct wm97xx *wm, int enable)  in wm9705_dig_enable()
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()
202 static inline int is_pden(struct wm97xx *wm)  in is_pden()
204 	return wm->dig[2] & WM9705_PDEN;  in is_pden()
210 static int wm9705_poll_sample(struct wm97xx *wm, int adcsel, int *sample)  in wm9705_poll_sample()
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()
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()
270 static int wm9705_poll_touch(struct wm97xx *wm, struct wm97xx_data *data)  in wm9705_poll_touch()
272 	int rc;  in wm9705_poll_touch()
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()
294 static int wm9705_acc_enable(struct wm97xx *wm, int enable)  in wm9705_acc_enable()
297 	int ret = 0;  in wm9705_acc_enable()
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()
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()