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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. | |
b8d055a8 | 6 | * Author: Liam Girdwood <lrg@slimlogic.co.uk> |
4db8a5f2 MB |
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 | |
af901ca1 | 17 | * data in a continuous manner on the Intel XScale architecture |
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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> | |
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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> | |
b833306f MV |
34 | #include <linux/gpio.h> |
35 | ||
1f017a99 | 36 | #include <mach/regs-ac97.h> |
4db8a5f2 | 37 | |
b833306f | 38 | #include <asm/mach-types.h> |
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39 | |
40 | struct 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 | ||
49 | static 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 */ | |
65 | static int sp_idx; | |
66 | static u16 last, tries; | |
b833306f | 67 | static int irq; |
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68 | |
69 | /* | |
70 | * Pen sampling frequency (Hz) in continuous mode. | |
71 | */ | |
72 | static int cont_rate = 200; | |
73 | module_param(cont_rate, int, 0); | |
74 | MODULE_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 | */ | |
82 | static int pen_int; | |
83 | module_param(pen_int, int, 0); | |
84 | MODULE_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 | */ | |
91 | static int pressure; | |
92 | module_param(pressure, int, 0); | |
93 | MODULE_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 | */ | |
100 | static int ac97_touch_slot = 5; | |
101 | module_param(ac97_touch_slot, int, 0); | |
102 | MODULE_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 | |
107 | static 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 | |
115 | static void wm97xx_acc_pen_up(struct wm97xx *wm) | |
116 | { | |
180deb50 JS |
117 | unsigned int count; |
118 | ||
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119 | schedule_timeout_uninterruptible(1); |
120 | ||
180deb50 | 121 | for (count = 0; count < 16; count++) |
4db8a5f2 | 122 | MODR; |
4db8a5f2 MB |
123 | } |
124 | #endif | |
125 | ||
126 | static 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 | |
af901ca1 | 134 | * threshold set to use the notifications it gives. |
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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 | /* are samples valid */ | |
157 | if ((x & WM97XX_ADCSRC_MASK) != WM97XX_ADCSEL_X || | |
158 | (y & WM97XX_ADCSRC_MASK) != WM97XX_ADCSEL_Y || | |
159 | (p & WM97XX_ADCSRC_MASK) != WM97XX_ADCSEL_PRES) | |
160 | goto up; | |
161 | ||
162 | /* coordinate is good */ | |
163 | tries = 0; | |
164 | input_report_abs(wm->input_dev, ABS_X, x & 0xfff); | |
165 | input_report_abs(wm->input_dev, ABS_Y, y & 0xfff); | |
166 | input_report_abs(wm->input_dev, ABS_PRESSURE, p & 0xfff); | |
cd2d64b1 | 167 | input_report_key(wm->input_dev, BTN_TOUCH, (p != 0)); |
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168 | input_sync(wm->input_dev); |
169 | reads++; | |
170 | } while (reads < cinfo[sp_idx].reads); | |
171 | up: | |
172 | return RC_PENDOWN | RC_AGAIN; | |
173 | } | |
174 | ||
175 | static int wm97xx_acc_startup(struct wm97xx *wm) | |
176 | { | |
b833306f | 177 | int idx = 0, ret = 0; |
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178 | |
179 | /* check we have a codec */ | |
180 | if (wm->ac97 == NULL) | |
181 | return -ENODEV; | |
182 | ||
183 | /* Go you big red fire engine */ | |
184 | for (idx = 0; idx < ARRAY_SIZE(cinfo); idx++) { | |
185 | if (wm->id != cinfo[idx].id) | |
186 | continue; | |
187 | sp_idx = idx; | |
188 | if (cont_rate <= cinfo[idx].speed) | |
189 | break; | |
190 | } | |
191 | wm->acc_rate = cinfo[sp_idx].code; | |
192 | wm->acc_slot = ac97_touch_slot; | |
193 | dev_info(wm->dev, | |
194 | "mainstone accelerated touchscreen driver, %d samples/sec\n", | |
195 | cinfo[sp_idx].speed); | |
196 | ||
b833306f MV |
197 | /* IRQ driven touchscreen is used on Palm hardware */ |
198 | if (machine_is_palmt5() || machine_is_palmtx() || machine_is_palmld()) { | |
199 | pen_int = 1; | |
200 | irq = 27; | |
99fde513 MV |
201 | /* There is some obscure mutant of WM9712 interbred with WM9713 |
202 | * used on Palm HW */ | |
203 | wm->variant = WM97xx_WM1613; | |
b833306f MV |
204 | } else if (machine_is_mainstone() && pen_int) |
205 | irq = 4; | |
206 | ||
207 | if (irq) { | |
208 | ret = gpio_request(irq, "Touchscreen IRQ"); | |
209 | if (ret) | |
210 | goto out; | |
211 | ||
212 | ret = gpio_direction_input(irq); | |
213 | if (ret) { | |
214 | gpio_free(irq); | |
215 | goto out; | |
216 | } | |
217 | ||
218 | wm->pen_irq = gpio_to_irq(irq); | |
219 | set_irq_type(wm->pen_irq, IRQ_TYPE_EDGE_BOTH); | |
220 | } else /* pen irq not supported */ | |
221 | pen_int = 0; | |
222 | ||
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223 | /* codec specific irq config */ |
224 | if (pen_int) { | |
225 | switch (wm->id) { | |
226 | case WM9705_ID2: | |
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227 | break; |
228 | case WM9712_ID2: | |
229 | case WM9713_ID2: | |
4db8a5f2 | 230 | /* use PEN_DOWN GPIO 13 to assert IRQ on GPIO line 2 */ |
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231 | wm97xx_config_gpio(wm, WM97XX_GPIO_13, WM97XX_GPIO_IN, |
232 | WM97XX_GPIO_POL_HIGH, | |
233 | WM97XX_GPIO_STICKY, | |
234 | WM97XX_GPIO_WAKE); | |
235 | wm97xx_config_gpio(wm, WM97XX_GPIO_2, WM97XX_GPIO_OUT, | |
236 | WM97XX_GPIO_POL_HIGH, | |
237 | WM97XX_GPIO_NOTSTICKY, | |
238 | WM97XX_GPIO_NOWAKE); | |
239 | break; | |
240 | default: | |
241 | dev_err(wm->dev, | |
242 | "pen down irq not supported on this device\n"); | |
243 | pen_int = 0; | |
244 | break; | |
245 | } | |
246 | } | |
247 | ||
b833306f MV |
248 | out: |
249 | return ret; | |
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250 | } |
251 | ||
252 | static void wm97xx_acc_shutdown(struct wm97xx *wm) | |
253 | { | |
254 | /* codec specific deconfig */ | |
255 | if (pen_int) { | |
b833306f MV |
256 | if (irq) |
257 | gpio_free(irq); | |
258 | wm->pen_irq = 0; | |
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259 | } |
260 | } | |
261 | ||
262 | static void wm97xx_irq_enable(struct wm97xx *wm, int enable) | |
263 | { | |
264 | if (enable) | |
265 | enable_irq(wm->pen_irq); | |
266 | else | |
a700e72d | 267 | disable_irq_nosync(wm->pen_irq); |
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268 | } |
269 | ||
270 | static struct wm97xx_mach_ops mainstone_mach_ops = { | |
271 | .acc_enabled = 1, | |
272 | .acc_pen_up = wm97xx_acc_pen_up, | |
273 | .acc_pen_down = wm97xx_acc_pen_down, | |
274 | .acc_startup = wm97xx_acc_startup, | |
275 | .acc_shutdown = wm97xx_acc_shutdown, | |
276 | .irq_enable = wm97xx_irq_enable, | |
277 | .irq_gpio = WM97XX_GPIO_2, | |
278 | }; | |
279 | ||
280 | static int mainstone_wm97xx_probe(struct platform_device *pdev) | |
281 | { | |
282 | struct wm97xx *wm = platform_get_drvdata(pdev); | |
283 | ||
284 | return wm97xx_register_mach_ops(wm, &mainstone_mach_ops); | |
285 | } | |
286 | ||
287 | static int mainstone_wm97xx_remove(struct platform_device *pdev) | |
288 | { | |
289 | struct wm97xx *wm = platform_get_drvdata(pdev); | |
290 | ||
291 | wm97xx_unregister_mach_ops(wm); | |
292 | return 0; | |
293 | } | |
294 | ||
295 | static struct platform_driver mainstone_wm97xx_driver = { | |
296 | .probe = mainstone_wm97xx_probe, | |
297 | .remove = mainstone_wm97xx_remove, | |
298 | .driver = { | |
299 | .name = "wm97xx-touch", | |
300 | }, | |
301 | }; | |
302 | ||
303 | static int __init mainstone_wm97xx_init(void) | |
304 | { | |
305 | return platform_driver_register(&mainstone_wm97xx_driver); | |
306 | } | |
307 | ||
308 | static void __exit mainstone_wm97xx_exit(void) | |
309 | { | |
310 | platform_driver_unregister(&mainstone_wm97xx_driver); | |
311 | } | |
312 | ||
313 | module_init(mainstone_wm97xx_init); | |
314 | module_exit(mainstone_wm97xx_exit); | |
315 | ||
316 | /* Module information */ | |
b8d055a8 | 317 | MODULE_AUTHOR("Liam Girdwood <lrg@slimlogic.co.uk>"); |
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318 | MODULE_DESCRIPTION("wm97xx continuous touch driver for mainstone"); |
319 | MODULE_LICENSE("GPL"); |