1/* SPDX-License-Identifier: GPL-2.0 */
2
3/*
4 * Register bits and API for Wolfson WM97xx series of codecs
5 */
6
7#ifndef _LINUX_WM97XX_H
8#define _LINUX_WM97XX_H
9
10#include <sound/core.h>
11#include <sound/pcm.h>
12#include <sound/ac97_codec.h>
13#include <sound/initval.h>
14#include <linux/types.h>
15#include <linux/list.h>
16#include <linux/input.h> /* Input device layer */
17#include <linux/platform_device.h>
18
19/*
20 * WM97xx variants
21 */
22#define WM97xx_GENERIC 0x0000
23#define WM97xx_WM1613 0x1613
24
25/*
26 * WM97xx AC97 Touchscreen registers
27 */
28#define AC97_WM97XX_DIGITISER1 0x76
29#define AC97_WM97XX_DIGITISER2 0x78
30#define AC97_WM97XX_DIGITISER_RD 0x7a
31#define AC97_WM9713_DIG1 0x74
32#define AC97_WM9713_DIG2 AC97_WM97XX_DIGITISER1
33#define AC97_WM9713_DIG3 AC97_WM97XX_DIGITISER2
34
35/*
36 * WM97xx register bits
37 */
38#define WM97XX_POLL 0x8000 /* initiate a polling measurement */
39#define WM97XX_ADCSEL_X 0x1000 /* x coord measurement */
40#define WM97XX_ADCSEL_Y 0x2000 /* y coord measurement */
41#define WM97XX_ADCSEL_PRES 0x3000 /* pressure measurement */
42#define WM97XX_AUX_ID1 0x4000
43#define WM97XX_AUX_ID2 0x5000
44#define WM97XX_AUX_ID3 0x6000
45#define WM97XX_AUX_ID4 0x7000
46#define WM97XX_ADCSEL_MASK 0x7000 /* ADC selection mask */
47#define WM97XX_COO 0x0800 /* enable coordinate mode */
48#define WM97XX_CTC 0x0400 /* enable continuous mode */
49#define WM97XX_CM_RATE_93 0x0000 /* 93.75Hz continuous rate */
50#define WM97XX_CM_RATE_187 0x0100 /* 187.5Hz continuous rate */
51#define WM97XX_CM_RATE_375 0x0200 /* 375Hz continuous rate */
52#define WM97XX_CM_RATE_750 0x0300 /* 750Hz continuous rate */
53#define WM97XX_CM_RATE_8K 0x00f0 /* 8kHz continuous rate */
54#define WM97XX_CM_RATE_12K 0x01f0 /* 12kHz continuous rate */
55#define WM97XX_CM_RATE_24K 0x02f0 /* 24kHz continuous rate */
56#define WM97XX_CM_RATE_48K 0x03f0 /* 48kHz continuous rate */
57#define WM97XX_CM_RATE_MASK 0x03f0
58#define WM97XX_RATE(i) (((i & 3) << 8) | ((i & 4) ? 0xf0 : 0))
59#define WM97XX_DELAY(i) ((i << 4) & 0x00f0) /* sample delay times */
60#define WM97XX_DELAY_MASK 0x00f0
61#define WM97XX_SLEN 0x0008 /* slot read back enable */
62#define WM97XX_SLT(i) ((i - 5) & 0x7) /* panel slot (5-11) */
63#define WM97XX_SLT_MASK 0x0007
64#define WM97XX_PRP_DETW 0x4000 /* detect on, digitise off, wake */
65#define WM97XX_PRP_DET 0x8000 /* detect on, digitise off, no wake */
66#define WM97XX_PRP_DET_DIG 0xc000 /* setect on, digitise on */
67#define WM97XX_RPR 0x2000 /* wake up on pen down */
68#define WM97XX_PEN_DOWN 0x8000 /* pen is down */
69
70/* WM9712 Bits */
71#define WM9712_45W 0x1000 /* set for 5-wire touchscreen */
72#define WM9712_PDEN 0x0800 /* measure only when pen down */
73#define WM9712_WAIT 0x0200 /* wait until adc is read before next sample */
74#define WM9712_PIL 0x0100 /* current used for pressure measurement. set 400uA else 200uA */
75#define WM9712_MASK_HI 0x0040 /* hi on mask pin (47) stops conversions */
76#define WM9712_MASK_EDGE 0x0080 /* rising/falling edge on pin delays sample */
77#define WM9712_MASK_SYNC 0x00c0 /* rising/falling edge on mask initiates sample */
78#define WM9712_RPU(i) (i&0x3f) /* internal pull up on pen detect (64k / rpu) */
79#define WM9712_PD(i) (0x1 << i) /* power management */
80
81/* WM9712 Registers */
82#define AC97_WM9712_POWER 0x24
83#define AC97_WM9712_REV 0x58
84
85/* WM9705 Bits */
86#define WM9705_PDEN 0x1000 /* measure only when pen is down */
87#define WM9705_PINV 0x0800 /* inverts sense of pen down output */
88#define WM9705_BSEN 0x0400 /* BUSY flag enable, pin47 is 1 when busy */
89#define WM9705_BINV 0x0200 /* invert BUSY (pin47) output */
90#define WM9705_WAIT 0x0100 /* wait until adc is read before next sample */
91#define WM9705_PIL 0x0080 /* current used for pressure measurement. set 400uA else 200uA */
92#define WM9705_PHIZ 0x0040 /* set PHONE and PCBEEP inputs to high impedance */
93#define WM9705_MASK_HI 0x0010 /* hi on mask stops conversions */
94#define WM9705_MASK_EDGE 0x0020 /* rising/falling edge on pin delays sample */
95#define WM9705_MASK_SYNC 0x0030 /* rising/falling edge on mask initiates sample */
96#define WM9705_PDD(i) (i & 0x000f) /* pen detect comparator threshold */
97
98
99/* WM9713 Bits */
100#define WM9713_PDPOL 0x0400 /* Pen down polarity */
101#define WM9713_POLL 0x0200 /* initiate a polling measurement */
102#define WM9713_CTC 0x0100 /* enable continuous mode */
103#define WM9713_ADCSEL_X 0x0002 /* X measurement */
104#define WM9713_ADCSEL_Y 0x0004 /* Y measurement */
105#define WM9713_ADCSEL_PRES 0x0008 /* Pressure measurement */
106#define WM9713_COO 0x0001 /* enable coordinate mode */
107#define WM9713_45W 0x1000 /* set for 5 wire panel */
108#define WM9713_PDEN 0x0800 /* measure only when pen down */
109#define WM9713_ADCSEL_MASK 0x00fe /* ADC selection mask */
110#define WM9713_WAIT 0x0200 /* coordinate wait */
111
112/* AUX ADC ID's */
113#define TS_COMP1 0x0
114#define TS_COMP2 0x1
115#define TS_BMON 0x2
116#define TS_WIPER 0x3
117
118/* ID numbers */
119#define WM97XX_ID1 0x574d
120#define WM9712_ID2 0x4c12
121#define WM9705_ID2 0x4c05
122#define WM9713_ID2 0x4c13
123
124/* Codec GPIO's */
125#define WM97XX_MAX_GPIO 16
126#define WM97XX_GPIO_1 (1 << 1)
127#define WM97XX_GPIO_2 (1 << 2)
128#define WM97XX_GPIO_3 (1 << 3)
129#define WM97XX_GPIO_4 (1 << 4)
130#define WM97XX_GPIO_5 (1 << 5)
131#define WM97XX_GPIO_6 (1 << 6)
132#define WM97XX_GPIO_7 (1 << 7)
133#define WM97XX_GPIO_8 (1 << 8)
134#define WM97XX_GPIO_9 (1 << 9)
135#define WM97XX_GPIO_10 (1 << 10)
136#define WM97XX_GPIO_11 (1 << 11)
137#define WM97XX_GPIO_12 (1 << 12)
138#define WM97XX_GPIO_13 (1 << 13)
139#define WM97XX_GPIO_14 (1 << 14)
140#define WM97XX_GPIO_15 (1 << 15)
141
142
143#define AC97_LINK_FRAME 21 /* time in uS for AC97 link frame */
144
145
146/*---------------- Return codes from sample reading functions ---------------*/
147
148/* More data is available; call the sample gathering function again */
149#define RC_AGAIN 0x00000001
150/* The returned sample is valid */
151#define RC_VALID 0x00000002
152/* The pen is up (the first RC_VALID without RC_PENUP means pen is down) */
153#define RC_PENUP 0x00000004
154/* The pen is down (RC_VALID implies RC_PENDOWN, but sometimes it is helpful
155 to tell the handler that the pen is down but we don't know yet his coords,
156 so the handler should not sleep or wait for pendown irq) */
157#define RC_PENDOWN 0x00000008
158
159/*
160 * The wm97xx driver provides a private API for writing platform-specific
161 * drivers.
162 */
163
164/* The structure used to return arch specific sampled data into */
165struct wm97xx_data {
166 int x;
167 int y;
168 int p;
169};
170
171/*
172 * Codec GPIO status
173 */
174enum wm97xx_gpio_status {
175 WM97XX_GPIO_HIGH,
176 WM97XX_GPIO_LOW
177};
178
179/*
180 * Codec GPIO direction
181 */
182enum wm97xx_gpio_dir {
183 WM97XX_GPIO_IN,
184 WM97XX_GPIO_OUT
185};
186
187/*
188 * Codec GPIO polarity
189 */
190enum wm97xx_gpio_pol {
191 WM97XX_GPIO_POL_HIGH,
192 WM97XX_GPIO_POL_LOW
193};
194
195/*
196 * Codec GPIO sticky
197 */
198enum wm97xx_gpio_sticky {
199 WM97XX_GPIO_STICKY,
200 WM97XX_GPIO_NOTSTICKY
201};
202
203/*
204 * Codec GPIO wake
205 */
206enum wm97xx_gpio_wake {
207 WM97XX_GPIO_WAKE,
208 WM97XX_GPIO_NOWAKE
209};
210
211/*
212 * Digitiser ioctl commands
213 */
214#define WM97XX_DIG_START 0x1
215#define WM97XX_DIG_STOP 0x2
216#define WM97XX_PHY_INIT 0x3
217#define WM97XX_AUX_PREPARE 0x4
218#define WM97XX_DIG_RESTORE 0x5
219
220struct wm97xx;
221
222extern struct wm97xx_codec_drv wm9705_codec;
223extern struct wm97xx_codec_drv wm9712_codec;
224extern struct wm97xx_codec_drv wm9713_codec;
225
226/*
227 * Codec driver interface - allows mapping to WM9705/12/13 and newer codecs
228 */
229struct wm97xx_codec_drv {
230 u16 id;
231 char *name;
232
233 /* read 1 sample */
234 int (*poll_sample) (struct wm97xx *, int adcsel, int *sample);
235
236 /* read X,Y,[P] in poll */
237 int (*poll_touch) (struct wm97xx *, struct wm97xx_data *);
238
239 int (*acc_enable) (struct wm97xx *, int enable);
240 void (*phy_init) (struct wm97xx *);
241 void (*dig_enable) (struct wm97xx *, int enable);
242 void (*dig_restore) (struct wm97xx *);
243 void (*aux_prepare) (struct wm97xx *);
244};
245
246
247/* Machine specific and accelerated touch operations */
248struct wm97xx_mach_ops {
249
250 /* accelerated touch readback - coords are transmited on AC97 link */
251 int acc_enabled;
252 void (*acc_pen_up) (struct wm97xx *);
253 int (*acc_pen_down) (struct wm97xx *);
254 int (*acc_startup) (struct wm97xx *);
255 void (*acc_shutdown) (struct wm97xx *);
256
257 /* interrupt mask control - required for accelerated operation */
258 void (*irq_enable) (struct wm97xx *, int enable);
259
260 /* GPIO pin used for accelerated operation */
261 int irq_gpio;
262
263 /* pre and post sample - can be used to minimise any analog noise */
264 void (*pre_sample) (int); /* function to run before sampling */
265 void (*post_sample) (int); /* function to run after sampling */
266};
267
268struct wm97xx {
269 u16 dig[3], id, gpio[6], misc; /* Cached codec registers */
270 u16 dig_save[3]; /* saved during aux reading */
271 struct wm97xx_codec_drv *codec; /* attached codec driver*/
272 struct input_dev *input_dev; /* touchscreen input device */
273 struct snd_ac97 *ac97; /* ALSA codec access */
274 struct device *dev; /* ALSA device */
275 struct platform_device *battery_dev;
276 struct platform_device *touch_dev;
277 struct wm97xx_mach_ops *mach_ops;
278 struct mutex codec_mutex;
279 struct delayed_work ts_reader; /* Used to poll touchscreen */
280 unsigned long ts_reader_interval; /* Current interval for timer */
281 unsigned long ts_reader_min_interval; /* Minimum interval */
282 unsigned int pen_irq; /* Pen IRQ number in use */
283 struct workqueue_struct *ts_workq;
284 struct work_struct pen_event_work;
285 u16 acc_slot; /* AC97 slot used for acc touch data */
286 u16 acc_rate; /* acc touch data rate */
287 unsigned pen_is_down:1; /* Pen is down */
288 unsigned aux_waiting:1; /* aux measurement waiting */
289 unsigned pen_probably_down:1; /* used in polling mode */
290 u16 variant; /* WM97xx chip variant */
291 u16 suspend_mode; /* PRP in suspend mode */
292};
293
294struct wm97xx_batt_pdata {
295 int batt_aux;
296 int temp_aux;
297 int charge_gpio;
298 int min_voltage;
299 int max_voltage;
300 int batt_div;
301 int batt_mult;
302 int temp_div;
303 int temp_mult;
304 int batt_tech;
305 char *batt_name;
306};
307
308struct wm97xx_pdata {
309 struct wm97xx_batt_pdata *batt_pdata; /* battery data */
310};
311
312/*
313 * Codec GPIO access (not supported on WM9705)
314 * This can be used to set/get codec GPIO and Virtual GPIO status.
315 */
316enum wm97xx_gpio_status wm97xx_get_gpio(struct wm97xx *wm, u32 gpio);
317void wm97xx_set_gpio(struct wm97xx *wm, u32 gpio,
318 enum wm97xx_gpio_status status);
319void wm97xx_config_gpio(struct wm97xx *wm, u32 gpio,
320 enum wm97xx_gpio_dir dir,
321 enum wm97xx_gpio_pol pol,
322 enum wm97xx_gpio_sticky sticky,
323 enum wm97xx_gpio_wake wake);
324
325void wm97xx_set_suspend_mode(struct wm97xx *wm, u16 mode);
326
327/* codec AC97 IO access */
328int wm97xx_reg_read(struct wm97xx *wm, u16 reg);
329void wm97xx_reg_write(struct wm97xx *wm, u16 reg, u16 val);
330
331/* aux adc readback */
332int wm97xx_read_aux_adc(struct wm97xx *wm, u16 adcsel);
333
334/* machine ops */
335int wm97xx_register_mach_ops(struct wm97xx *, struct wm97xx_mach_ops *);
336void wm97xx_unregister_mach_ops(struct wm97xx *);
337
338#endif
339