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1/*
2 * mainstone-wm97xx.c -- Mainstone Continuous Touch screen driver for
3 * Wolfson WM97xx AC97 Codecs.
4 *
5 * Copyright 2004, 2007 Wolfson Microelectronics PLC.
6 * Author: Liam Girdwood <lrg@slimlogic.co.uk>
7 * Parts Copyright : Ian Molton <spyro@f2s.com>
8 * Andrew Zabolotny <zap@homelink.ru>
9 *
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License as published by the
12 * Free Software Foundation; either version 2 of the License, or (at your
13 * option) any later version.
14 *
15 * Notes:
16 * This is a wm97xx extended touch driver to capture touch
17 * data in a continuous manner on the Intel XScale architecture
18 *
19 * Features:
20 * - codecs supported:- WM9705, WM9712, WM9713
21 * - processors supported:- Intel XScale PXA25x, PXA26x, PXA27x
22 *
23 */
24
25#include <linux/module.h>
26#include <linux/moduleparam.h>
27#include <linux/kernel.h>
28#include <linux/init.h>
29#include <linux/delay.h>
30#include <linux/irq.h>
31#include <linux/interrupt.h>
32#include <linux/wm97xx.h>
33#include <linux/io.h>
34#include <linux/gpio.h>
35
36#include <mach/regs-ac97.h>
37
38#include <asm/mach-types.h>
39
40struct continuous {
41 u16 id; /* codec id */
42 u8 code; /* continuous code */
43 u8 reads; /* number of coord reads per read cycle */
44 u32 speed; /* number of coords per second */
45};
46
47#define WM_READS(sp) ((sp / HZ) + 1)
48
49static const struct continuous cinfo[] = {
50 {WM9705_ID2, 0, WM_READS(94), 94},
51 {WM9705_ID2, 1, WM_READS(188), 188},
52 {WM9705_ID2, 2, WM_READS(375), 375},
53 {WM9705_ID2, 3, WM_READS(750), 750},
54 {WM9712_ID2, 0, WM_READS(94), 94},
55 {WM9712_ID2, 1, WM_READS(188), 188},
56 {WM9712_ID2, 2, WM_READS(375), 375},
57 {WM9712_ID2, 3, WM_READS(750), 750},
58 {WM9713_ID2, 0, WM_READS(94), 94},
59 {WM9713_ID2, 1, WM_READS(120), 120},
60 {WM9713_ID2, 2, WM_READS(154), 154},
61 {WM9713_ID2, 3, WM_READS(188), 188},
62};
63
64/* continuous speed index */
65static int sp_idx;
66static u16 last, tries;
67static int irq;
68
69/*
70 * Pen sampling frequency (Hz) in continuous mode.
71 */
72static int cont_rate = 200;
73module_param(cont_rate, int, 0);
74MODULE_PARM_DESC(cont_rate, "Sampling rate in continuous mode (Hz)");
75
76/*
77 * Pen down detection.
78 *
79 * This driver can either poll or use an interrupt to indicate a pen down
80 * event. If the irq request fails then it will fall back to polling mode.
81 */
82static int pen_int;
83module_param(pen_int, int, 0);
84MODULE_PARM_DESC(pen_int, "Pen down detection (1 = interrupt, 0 = polling)");
85
86/*
87 * Pressure readback.
88 *
89 * Set to 1 to read back pen down pressure
90 */
91static int pressure;
92module_param(pressure, int, 0);
93MODULE_PARM_DESC(pressure, "Pressure readback (1 = pressure, 0 = no pressure)");
94
95/*
96 * AC97 touch data slot.
97 *
98 * Touch screen readback data ac97 slot
99 */
100static int ac97_touch_slot = 5;
101module_param(ac97_touch_slot, int, 0);
102MODULE_PARM_DESC(ac97_touch_slot, "Touch screen data slot AC97 number");
103
104
105/* flush AC97 slot 5 FIFO on pxa machines */
106#ifdef CONFIG_PXA27x
107static void wm97xx_acc_pen_up(struct wm97xx *wm)
108{
109 schedule_timeout_uninterruptible(1);
110
111 while (MISR & (1 << 2))
112 MODR;
113}
114#else
115static void wm97xx_acc_pen_up(struct wm97xx *wm)
116{
117 unsigned int count;
118
119 schedule_timeout_uninterruptible(1);
120
121 for (count = 0; count < 16; count++)
122 MODR;
123}
124#endif
125
126static int wm97xx_acc_pen_down(struct wm97xx *wm)
127{
128 u16 x, y, p = 0x100 | WM97XX_ADCSEL_PRES;
129 int reads = 0;
130
131 /* When the AC97 queue has been drained we need to allow time
132 * to buffer up samples otherwise we end up spinning polling
133 * for samples. The controller can't have a suitably low
134 * threshold set to use the notifications it gives.
135 */
136 schedule_timeout_uninterruptible(1);
137
138 if (tries > 5) {
139 tries = 0;
140 return RC_PENUP;
141 }
142
143 x = MODR;
144 if (x == last) {
145 tries++;
146 return RC_AGAIN;
147 }
148 last = x;
149 do {
150 if (reads)
151 x = MODR;
152 y = MODR;
153 if (pressure)
154 p = MODR;
155
156 dev_dbg(wm->dev, "Raw coordinates: x=%x, y=%x, p=%x\n",
157 x, y, p);
158
159 /* are samples valid */
160 if ((x & WM97XX_ADCSEL_MASK) != WM97XX_ADCSEL_X ||
161 (y & WM97XX_ADCSEL_MASK) != WM97XX_ADCSEL_Y ||
162 (p & WM97XX_ADCSEL_MASK) != WM97XX_ADCSEL_PRES)
163 goto up;
164
165 /* coordinate is good */
166 tries = 0;
167 input_report_abs(wm->input_dev, ABS_X, x & 0xfff);
168 input_report_abs(wm->input_dev, ABS_Y, y & 0xfff);
169 input_report_abs(wm->input_dev, ABS_PRESSURE, p & 0xfff);
170 input_report_key(wm->input_dev, BTN_TOUCH, (p != 0));
171 input_sync(wm->input_dev);
172 reads++;
173 } while (reads < cinfo[sp_idx].reads);
174up:
175 return RC_PENDOWN | RC_AGAIN;
176}
177
178static int wm97xx_acc_startup(struct wm97xx *wm)
179{
180 int idx = 0, ret = 0;
181
182 /* check we have a codec */
183 if (wm->ac97 == NULL)
184 return -ENODEV;
185
186 /* Go you big red fire engine */
187 for (idx = 0; idx < ARRAY_SIZE(cinfo); idx++) {
188 if (wm->id != cinfo[idx].id)
189 continue;
190 sp_idx = idx;
191 if (cont_rate <= cinfo[idx].speed)
192 break;
193 }
194 wm->acc_rate = cinfo[sp_idx].code;
195 wm->acc_slot = ac97_touch_slot;
196 dev_info(wm->dev,
197 "mainstone accelerated touchscreen driver, %d samples/sec\n",
198 cinfo[sp_idx].speed);
199
200 /* IRQ driven touchscreen is used on Palm hardware */
201 if (machine_is_palmt5() || machine_is_palmtx() || machine_is_palmld()) {
202 pen_int = 1;
203 irq = 27;
204 /* There is some obscure mutant of WM9712 interbred with WM9713
205 * used on Palm HW */
206 wm->variant = WM97xx_WM1613;
207 } else if (machine_is_mainstone() && pen_int)
208 irq = 4;
209
210 if (irq) {
211 ret = gpio_request(irq, "Touchscreen IRQ");
212 if (ret)
213 goto out;
214
215 ret = gpio_direction_input(irq);
216 if (ret) {
217 gpio_free(irq);
218 goto out;
219 }
220
221 wm->pen_irq = gpio_to_irq(irq);
222 irq_set_irq_type(wm->pen_irq, IRQ_TYPE_EDGE_BOTH);
223 } else /* pen irq not supported */
224 pen_int = 0;
225
226 /* codec specific irq config */
227 if (pen_int) {
228 switch (wm->id) {
229 case WM9705_ID2:
230 break;
231 case WM9712_ID2:
232 case WM9713_ID2:
233 /* use PEN_DOWN GPIO 13 to assert IRQ on GPIO line 2 */
234 wm97xx_config_gpio(wm, WM97XX_GPIO_13, WM97XX_GPIO_IN,
235 WM97XX_GPIO_POL_HIGH,
236 WM97XX_GPIO_STICKY,
237 WM97XX_GPIO_WAKE);
238 wm97xx_config_gpio(wm, WM97XX_GPIO_2, WM97XX_GPIO_OUT,
239 WM97XX_GPIO_POL_HIGH,
240 WM97XX_GPIO_NOTSTICKY,
241 WM97XX_GPIO_NOWAKE);
242 break;
243 default:
244 dev_err(wm->dev,
245 "pen down irq not supported on this device\n");
246 pen_int = 0;
247 break;
248 }
249 }
250
251out:
252 return ret;
253}
254
255static void wm97xx_acc_shutdown(struct wm97xx *wm)
256{
257 /* codec specific deconfig */
258 if (pen_int) {
259 if (irq)
260 gpio_free(irq);
261 wm->pen_irq = 0;
262 }
263}
264
265static void wm97xx_irq_enable(struct wm97xx *wm, int enable)
266{
267 if (enable)
268 enable_irq(wm->pen_irq);
269 else
270 disable_irq_nosync(wm->pen_irq);
271}
272
273static struct wm97xx_mach_ops mainstone_mach_ops = {
274 .acc_enabled = 1,
275 .acc_pen_up = wm97xx_acc_pen_up,
276 .acc_pen_down = wm97xx_acc_pen_down,
277 .acc_startup = wm97xx_acc_startup,
278 .acc_shutdown = wm97xx_acc_shutdown,
279 .irq_enable = wm97xx_irq_enable,
280 .irq_gpio = WM97XX_GPIO_2,
281};
282
283static int mainstone_wm97xx_probe(struct platform_device *pdev)
284{
285 struct wm97xx *wm = platform_get_drvdata(pdev);
286
287 return wm97xx_register_mach_ops(wm, &mainstone_mach_ops);
288}
289
290static int mainstone_wm97xx_remove(struct platform_device *pdev)
291{
292 struct wm97xx *wm = platform_get_drvdata(pdev);
293
294 wm97xx_unregister_mach_ops(wm);
295 return 0;
296}
297
298static struct platform_driver mainstone_wm97xx_driver = {
299 .probe = mainstone_wm97xx_probe,
300 .remove = mainstone_wm97xx_remove,
301 .driver = {
302 .name = "wm97xx-touch",
303 },
304};
305
306static int __init mainstone_wm97xx_init(void)
307{
308 return platform_driver_register(&mainstone_wm97xx_driver);
309}
310
311static void __exit mainstone_wm97xx_exit(void)
312{
313 platform_driver_unregister(&mainstone_wm97xx_driver);
314}
315
316module_init(mainstone_wm97xx_init);
317module_exit(mainstone_wm97xx_exit);
318
319/* Module information */
320MODULE_AUTHOR("Liam Girdwood <lrg@slimlogic.co.uk>");
321MODULE_DESCRIPTION("wm97xx continuous touch driver for mainstone");
322MODULE_LICENSE("GPL");
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * mainstone-wm97xx.c -- Mainstone Continuous Touch screen driver for
4 * Wolfson WM97xx AC97 Codecs.
5 *
6 * Copyright 2004, 2007 Wolfson Microelectronics PLC.
7 * Author: Liam Girdwood <lrg@slimlogic.co.uk>
8 * Parts Copyright : Ian Molton <spyro@f2s.com>
9 * Andrew Zabolotny <zap@homelink.ru>
10 *
11 * Notes:
12 * This is a wm97xx extended touch driver to capture touch
13 * data in a continuous manner on the Intel XScale architecture
14 *
15 * Features:
16 * - codecs supported:- WM9705, WM9712, WM9713
17 * - processors supported:- Intel XScale PXA25x, PXA26x, PXA27x
18 */
19
20#include <linux/module.h>
21#include <linux/moduleparam.h>
22#include <linux/kernel.h>
23#include <linux/delay.h>
24#include <linux/irq.h>
25#include <linux/interrupt.h>
26#include <linux/wm97xx.h>
27#include <linux/io.h>
28#include <linux/gpio.h>
29
30#include <mach/regs-ac97.h>
31
32#include <asm/mach-types.h>
33
34struct continuous {
35 u16 id; /* codec id */
36 u8 code; /* continuous code */
37 u8 reads; /* number of coord reads per read cycle */
38 u32 speed; /* number of coords per second */
39};
40
41#define WM_READS(sp) ((sp / HZ) + 1)
42
43static const struct continuous cinfo[] = {
44 {WM9705_ID2, 0, WM_READS(94), 94},
45 {WM9705_ID2, 1, WM_READS(188), 188},
46 {WM9705_ID2, 2, WM_READS(375), 375},
47 {WM9705_ID2, 3, WM_READS(750), 750},
48 {WM9712_ID2, 0, WM_READS(94), 94},
49 {WM9712_ID2, 1, WM_READS(188), 188},
50 {WM9712_ID2, 2, WM_READS(375), 375},
51 {WM9712_ID2, 3, WM_READS(750), 750},
52 {WM9713_ID2, 0, WM_READS(94), 94},
53 {WM9713_ID2, 1, WM_READS(120), 120},
54 {WM9713_ID2, 2, WM_READS(154), 154},
55 {WM9713_ID2, 3, WM_READS(188), 188},
56};
57
58/* continuous speed index */
59static int sp_idx;
60static u16 last, tries;
61static int irq;
62
63/*
64 * Pen sampling frequency (Hz) in continuous mode.
65 */
66static int cont_rate = 200;
67module_param(cont_rate, int, 0);
68MODULE_PARM_DESC(cont_rate, "Sampling rate in continuous mode (Hz)");
69
70/*
71 * Pen down detection.
72 *
73 * This driver can either poll or use an interrupt to indicate a pen down
74 * event. If the irq request fails then it will fall back to polling mode.
75 */
76static int pen_int;
77module_param(pen_int, int, 0);
78MODULE_PARM_DESC(pen_int, "Pen down detection (1 = interrupt, 0 = polling)");
79
80/*
81 * Pressure readback.
82 *
83 * Set to 1 to read back pen down pressure
84 */
85static int pressure;
86module_param(pressure, int, 0);
87MODULE_PARM_DESC(pressure, "Pressure readback (1 = pressure, 0 = no pressure)");
88
89/*
90 * AC97 touch data slot.
91 *
92 * Touch screen readback data ac97 slot
93 */
94static int ac97_touch_slot = 5;
95module_param(ac97_touch_slot, int, 0);
96MODULE_PARM_DESC(ac97_touch_slot, "Touch screen data slot AC97 number");
97
98
99/* flush AC97 slot 5 FIFO on pxa machines */
100#ifdef CONFIG_PXA27x
101static void wm97xx_acc_pen_up(struct wm97xx *wm)
102{
103 schedule_timeout_uninterruptible(1);
104
105 while (MISR & (1 << 2))
106 MODR;
107}
108#else
109static void wm97xx_acc_pen_up(struct wm97xx *wm)
110{
111 unsigned int count;
112
113 schedule_timeout_uninterruptible(1);
114
115 for (count = 0; count < 16; count++)
116 MODR;
117}
118#endif
119
120static int wm97xx_acc_pen_down(struct wm97xx *wm)
121{
122 u16 x, y, p = 0x100 | WM97XX_ADCSEL_PRES;
123 int reads = 0;
124
125 /* When the AC97 queue has been drained we need to allow time
126 * to buffer up samples otherwise we end up spinning polling
127 * for samples. The controller can't have a suitably low
128 * threshold set to use the notifications it gives.
129 */
130 schedule_timeout_uninterruptible(1);
131
132 if (tries > 5) {
133 tries = 0;
134 return RC_PENUP;
135 }
136
137 x = MODR;
138 if (x == last) {
139 tries++;
140 return RC_AGAIN;
141 }
142 last = x;
143 do {
144 if (reads)
145 x = MODR;
146 y = MODR;
147 if (pressure)
148 p = MODR;
149
150 dev_dbg(wm->dev, "Raw coordinates: x=%x, y=%x, p=%x\n",
151 x, y, p);
152
153 /* are samples valid */
154 if ((x & WM97XX_ADCSEL_MASK) != WM97XX_ADCSEL_X ||
155 (y & WM97XX_ADCSEL_MASK) != WM97XX_ADCSEL_Y ||
156 (p & WM97XX_ADCSEL_MASK) != WM97XX_ADCSEL_PRES)
157 goto up;
158
159 /* coordinate is good */
160 tries = 0;
161 input_report_abs(wm->input_dev, ABS_X, x & 0xfff);
162 input_report_abs(wm->input_dev, ABS_Y, y & 0xfff);
163 input_report_abs(wm->input_dev, ABS_PRESSURE, p & 0xfff);
164 input_report_key(wm->input_dev, BTN_TOUCH, (p != 0));
165 input_sync(wm->input_dev);
166 reads++;
167 } while (reads < cinfo[sp_idx].reads);
168up:
169 return RC_PENDOWN | RC_AGAIN;
170}
171
172static int wm97xx_acc_startup(struct wm97xx *wm)
173{
174 int idx = 0, ret = 0;
175
176 /* check we have a codec */
177 if (wm->ac97 == NULL)
178 return -ENODEV;
179
180 /* Go you big red fire engine */
181 for (idx = 0; idx < ARRAY_SIZE(cinfo); idx++) {
182 if (wm->id != cinfo[idx].id)
183 continue;
184 sp_idx = idx;
185 if (cont_rate <= cinfo[idx].speed)
186 break;
187 }
188 wm->acc_rate = cinfo[sp_idx].code;
189 wm->acc_slot = ac97_touch_slot;
190 dev_info(wm->dev,
191 "mainstone accelerated touchscreen driver, %d samples/sec\n",
192 cinfo[sp_idx].speed);
193
194 /* IRQ driven touchscreen is used on Palm hardware */
195 if (machine_is_palmt5() || machine_is_palmtx() || machine_is_palmld()) {
196 pen_int = 1;
197 irq = 27;
198 /* There is some obscure mutant of WM9712 interbred with WM9713
199 * used on Palm HW */
200 wm->variant = WM97xx_WM1613;
201 } else if (machine_is_mainstone() && pen_int)
202 irq = 4;
203
204 if (irq) {
205 ret = gpio_request(irq, "Touchscreen IRQ");
206 if (ret)
207 goto out;
208
209 ret = gpio_direction_input(irq);
210 if (ret) {
211 gpio_free(irq);
212 goto out;
213 }
214
215 wm->pen_irq = gpio_to_irq(irq);
216 irq_set_irq_type(wm->pen_irq, IRQ_TYPE_EDGE_BOTH);
217 } else /* pen irq not supported */
218 pen_int = 0;
219
220 /* codec specific irq config */
221 if (pen_int) {
222 switch (wm->id) {
223 case WM9705_ID2:
224 break;
225 case WM9712_ID2:
226 case WM9713_ID2:
227 /* use PEN_DOWN GPIO 13 to assert IRQ on GPIO line 2 */
228 wm97xx_config_gpio(wm, WM97XX_GPIO_13, WM97XX_GPIO_IN,
229 WM97XX_GPIO_POL_HIGH,
230 WM97XX_GPIO_STICKY,
231 WM97XX_GPIO_WAKE);
232 wm97xx_config_gpio(wm, WM97XX_GPIO_2, WM97XX_GPIO_OUT,
233 WM97XX_GPIO_POL_HIGH,
234 WM97XX_GPIO_NOTSTICKY,
235 WM97XX_GPIO_NOWAKE);
236 break;
237 default:
238 dev_err(wm->dev,
239 "pen down irq not supported on this device\n");
240 pen_int = 0;
241 break;
242 }
243 }
244
245out:
246 return ret;
247}
248
249static void wm97xx_acc_shutdown(struct wm97xx *wm)
250{
251 /* codec specific deconfig */
252 if (pen_int) {
253 if (irq)
254 gpio_free(irq);
255 wm->pen_irq = 0;
256 }
257}
258
259static void wm97xx_irq_enable(struct wm97xx *wm, int enable)
260{
261 if (enable)
262 enable_irq(wm->pen_irq);
263 else
264 disable_irq_nosync(wm->pen_irq);
265}
266
267static struct wm97xx_mach_ops mainstone_mach_ops = {
268 .acc_enabled = 1,
269 .acc_pen_up = wm97xx_acc_pen_up,
270 .acc_pen_down = wm97xx_acc_pen_down,
271 .acc_startup = wm97xx_acc_startup,
272 .acc_shutdown = wm97xx_acc_shutdown,
273 .irq_enable = wm97xx_irq_enable,
274 .irq_gpio = WM97XX_GPIO_2,
275};
276
277static int mainstone_wm97xx_probe(struct platform_device *pdev)
278{
279 struct wm97xx *wm = platform_get_drvdata(pdev);
280
281 return wm97xx_register_mach_ops(wm, &mainstone_mach_ops);
282}
283
284static int mainstone_wm97xx_remove(struct platform_device *pdev)
285{
286 struct wm97xx *wm = platform_get_drvdata(pdev);
287
288 wm97xx_unregister_mach_ops(wm);
289 return 0;
290}
291
292static struct platform_driver mainstone_wm97xx_driver = {
293 .probe = mainstone_wm97xx_probe,
294 .remove = mainstone_wm97xx_remove,
295 .driver = {
296 .name = "wm97xx-touch",
297 },
298};
299module_platform_driver(mainstone_wm97xx_driver);
300
301/* Module information */
302MODULE_AUTHOR("Liam Girdwood <lrg@slimlogic.co.uk>");
303MODULE_DESCRIPTION("wm97xx continuous touch driver for mainstone");
304MODULE_LICENSE("GPL");