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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 | |
17 | * data in a continuous manner on the Intel XScale archictecture | |
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/version.h> | |
28 | #include <linux/kernel.h> | |
29 | #include <linux/init.h> | |
30 | #include <linux/delay.h> | |
31 | #include <linux/irq.h> | |
32 | #include <linux/interrupt.h> | |
33 | #include <linux/wm97xx.h> | |
34 | #include <linux/io.h> | |
35 | #include <asm/arch/pxa-regs.h> | |
36 | ||
37 | #define VERSION "0.13" | |
38 | ||
39 | struct continuous { | |
40 | u16 id; /* codec id */ | |
41 | u8 code; /* continuous code */ | |
42 | u8 reads; /* number of coord reads per read cycle */ | |
43 | u32 speed; /* number of coords per second */ | |
44 | }; | |
45 | ||
46 | #define WM_READS(sp) ((sp / HZ) + 1) | |
47 | ||
48 | static const struct continuous cinfo[] = { | |
49 | {WM9705_ID2, 0, WM_READS(94), 94}, | |
50 | {WM9705_ID2, 1, WM_READS(188), 188}, | |
51 | {WM9705_ID2, 2, WM_READS(375), 375}, | |
52 | {WM9705_ID2, 3, WM_READS(750), 750}, | |
53 | {WM9712_ID2, 0, WM_READS(94), 94}, | |
54 | {WM9712_ID2, 1, WM_READS(188), 188}, | |
55 | {WM9712_ID2, 2, WM_READS(375), 375}, | |
56 | {WM9712_ID2, 3, WM_READS(750), 750}, | |
57 | {WM9713_ID2, 0, WM_READS(94), 94}, | |
58 | {WM9713_ID2, 1, WM_READS(120), 120}, | |
59 | {WM9713_ID2, 2, WM_READS(154), 154}, | |
60 | {WM9713_ID2, 3, WM_READS(188), 188}, | |
61 | }; | |
62 | ||
63 | /* continuous speed index */ | |
64 | static int sp_idx; | |
65 | static u16 last, tries; | |
66 | ||
67 | /* | |
68 | * Pen sampling frequency (Hz) in continuous mode. | |
69 | */ | |
70 | static int cont_rate = 200; | |
71 | module_param(cont_rate, int, 0); | |
72 | MODULE_PARM_DESC(cont_rate, "Sampling rate in continuous mode (Hz)"); | |
73 | ||
74 | /* | |
75 | * Pen down detection. | |
76 | * | |
77 | * This driver can either poll or use an interrupt to indicate a pen down | |
78 | * event. If the irq request fails then it will fall back to polling mode. | |
79 | */ | |
80 | static int pen_int; | |
81 | module_param(pen_int, int, 0); | |
82 | MODULE_PARM_DESC(pen_int, "Pen down detection (1 = interrupt, 0 = polling)"); | |
83 | ||
84 | /* | |
85 | * Pressure readback. | |
86 | * | |
87 | * Set to 1 to read back pen down pressure | |
88 | */ | |
89 | static int pressure; | |
90 | module_param(pressure, int, 0); | |
91 | MODULE_PARM_DESC(pressure, "Pressure readback (1 = pressure, 0 = no pressure)"); | |
92 | ||
93 | /* | |
94 | * AC97 touch data slot. | |
95 | * | |
96 | * Touch screen readback data ac97 slot | |
97 | */ | |
98 | static int ac97_touch_slot = 5; | |
99 | module_param(ac97_touch_slot, int, 0); | |
100 | MODULE_PARM_DESC(ac97_touch_slot, "Touch screen data slot AC97 number"); | |
101 | ||
102 | ||
103 | /* flush AC97 slot 5 FIFO on pxa machines */ | |
104 | #ifdef CONFIG_PXA27x | |
105 | static void wm97xx_acc_pen_up(struct wm97xx *wm) | |
106 | { | |
107 | schedule_timeout_uninterruptible(1); | |
108 | ||
109 | while (MISR & (1 << 2)) | |
110 | MODR; | |
111 | } | |
112 | #else | |
113 | static void wm97xx_acc_pen_up(struct wm97xx *wm) | |
114 | { | |
115 | int count = 16; | |
116 | schedule_timeout_uninterruptible(1); | |
117 | ||
118 | while (count < 16) { | |
119 | MODR; | |
120 | count--; | |
121 | } | |
122 | } | |
123 | #endif | |
124 | ||
125 | static int wm97xx_acc_pen_down(struct wm97xx *wm) | |
126 | { | |
127 | u16 x, y, p = 0x100 | WM97XX_ADCSEL_PRES; | |
128 | int reads = 0; | |
129 | ||
130 | /* When the AC97 queue has been drained we need to allow time | |
131 | * to buffer up samples otherwise we end up spinning polling | |
132 | * for samples. The controller can't have a suitably low | |
133 | * threashold set to use the notifications it gives. | |
134 | */ | |
135 | schedule_timeout_uninterruptible(1); | |
136 | ||
137 | if (tries > 5) { | |
138 | tries = 0; | |
139 | return RC_PENUP; | |
140 | } | |
141 | ||
142 | x = MODR; | |
143 | if (x == last) { | |
144 | tries++; | |
145 | return RC_AGAIN; | |
146 | } | |
147 | last = x; | |
148 | do { | |
149 | if (reads) | |
150 | x = MODR; | |
151 | y = MODR; | |
152 | if (pressure) | |
153 | p = MODR; | |
154 | ||
155 | /* are samples valid */ | |
156 | if ((x & WM97XX_ADCSRC_MASK) != WM97XX_ADCSEL_X || | |
157 | (y & WM97XX_ADCSRC_MASK) != WM97XX_ADCSEL_Y || | |
158 | (p & WM97XX_ADCSRC_MASK) != WM97XX_ADCSEL_PRES) | |
159 | goto up; | |
160 | ||
161 | /* coordinate is good */ | |
162 | tries = 0; | |
163 | input_report_abs(wm->input_dev, ABS_X, x & 0xfff); | |
164 | input_report_abs(wm->input_dev, ABS_Y, y & 0xfff); | |
165 | input_report_abs(wm->input_dev, ABS_PRESSURE, p & 0xfff); | |
166 | input_sync(wm->input_dev); | |
167 | reads++; | |
168 | } while (reads < cinfo[sp_idx].reads); | |
169 | up: | |
170 | return RC_PENDOWN | RC_AGAIN; | |
171 | } | |
172 | ||
173 | static int wm97xx_acc_startup(struct wm97xx *wm) | |
174 | { | |
175 | int idx = 0; | |
176 | ||
177 | /* check we have a codec */ | |
178 | if (wm->ac97 == NULL) | |
179 | return -ENODEV; | |
180 | ||
181 | /* Go you big red fire engine */ | |
182 | for (idx = 0; idx < ARRAY_SIZE(cinfo); idx++) { | |
183 | if (wm->id != cinfo[idx].id) | |
184 | continue; | |
185 | sp_idx = idx; | |
186 | if (cont_rate <= cinfo[idx].speed) | |
187 | break; | |
188 | } | |
189 | wm->acc_rate = cinfo[sp_idx].code; | |
190 | wm->acc_slot = ac97_touch_slot; | |
191 | dev_info(wm->dev, | |
192 | "mainstone accelerated touchscreen driver, %d samples/sec\n", | |
193 | cinfo[sp_idx].speed); | |
194 | ||
195 | /* codec specific irq config */ | |
196 | if (pen_int) { | |
197 | switch (wm->id) { | |
198 | case WM9705_ID2: | |
199 | wm->pen_irq = IRQ_GPIO(4); | |
6cab4860 | 200 | set_irq_type(IRQ_GPIO(4), IRQ_TYPE_EDGE_BOTH); |
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201 | break; |
202 | case WM9712_ID2: | |
203 | case WM9713_ID2: | |
204 | /* enable pen down interrupt */ | |
205 | /* use PEN_DOWN GPIO 13 to assert IRQ on GPIO line 2 */ | |
206 | wm->pen_irq = MAINSTONE_AC97_IRQ; | |
207 | wm97xx_config_gpio(wm, WM97XX_GPIO_13, WM97XX_GPIO_IN, | |
208 | WM97XX_GPIO_POL_HIGH, | |
209 | WM97XX_GPIO_STICKY, | |
210 | WM97XX_GPIO_WAKE); | |
211 | wm97xx_config_gpio(wm, WM97XX_GPIO_2, WM97XX_GPIO_OUT, | |
212 | WM97XX_GPIO_POL_HIGH, | |
213 | WM97XX_GPIO_NOTSTICKY, | |
214 | WM97XX_GPIO_NOWAKE); | |
215 | break; | |
216 | default: | |
217 | dev_err(wm->dev, | |
218 | "pen down irq not supported on this device\n"); | |
219 | pen_int = 0; | |
220 | break; | |
221 | } | |
222 | } | |
223 | ||
224 | return 0; | |
225 | } | |
226 | ||
227 | static void wm97xx_acc_shutdown(struct wm97xx *wm) | |
228 | { | |
229 | /* codec specific deconfig */ | |
230 | if (pen_int) { | |
231 | switch (wm->id & 0xffff) { | |
232 | case WM9705_ID2: | |
233 | wm->pen_irq = 0; | |
234 | break; | |
235 | case WM9712_ID2: | |
236 | case WM9713_ID2: | |
237 | /* disable interrupt */ | |
238 | wm->pen_irq = 0; | |
239 | break; | |
240 | } | |
241 | } | |
242 | } | |
243 | ||
244 | static void wm97xx_irq_enable(struct wm97xx *wm, int enable) | |
245 | { | |
246 | if (enable) | |
247 | enable_irq(wm->pen_irq); | |
248 | else | |
249 | disable_irq(wm->pen_irq); | |
250 | } | |
251 | ||
252 | static struct wm97xx_mach_ops mainstone_mach_ops = { | |
253 | .acc_enabled = 1, | |
254 | .acc_pen_up = wm97xx_acc_pen_up, | |
255 | .acc_pen_down = wm97xx_acc_pen_down, | |
256 | .acc_startup = wm97xx_acc_startup, | |
257 | .acc_shutdown = wm97xx_acc_shutdown, | |
258 | .irq_enable = wm97xx_irq_enable, | |
259 | .irq_gpio = WM97XX_GPIO_2, | |
260 | }; | |
261 | ||
262 | static int mainstone_wm97xx_probe(struct platform_device *pdev) | |
263 | { | |
264 | struct wm97xx *wm = platform_get_drvdata(pdev); | |
265 | ||
266 | return wm97xx_register_mach_ops(wm, &mainstone_mach_ops); | |
267 | } | |
268 | ||
269 | static int mainstone_wm97xx_remove(struct platform_device *pdev) | |
270 | { | |
271 | struct wm97xx *wm = platform_get_drvdata(pdev); | |
272 | ||
273 | wm97xx_unregister_mach_ops(wm); | |
274 | return 0; | |
275 | } | |
276 | ||
277 | static struct platform_driver mainstone_wm97xx_driver = { | |
278 | .probe = mainstone_wm97xx_probe, | |
279 | .remove = mainstone_wm97xx_remove, | |
280 | .driver = { | |
281 | .name = "wm97xx-touch", | |
282 | }, | |
283 | }; | |
284 | ||
285 | static int __init mainstone_wm97xx_init(void) | |
286 | { | |
287 | return platform_driver_register(&mainstone_wm97xx_driver); | |
288 | } | |
289 | ||
290 | static void __exit mainstone_wm97xx_exit(void) | |
291 | { | |
292 | platform_driver_unregister(&mainstone_wm97xx_driver); | |
293 | } | |
294 | ||
295 | module_init(mainstone_wm97xx_init); | |
296 | module_exit(mainstone_wm97xx_exit); | |
297 | ||
298 | /* Module information */ | |
b8d055a8 | 299 | MODULE_AUTHOR("Liam Girdwood <lrg@slimlogic.co.uk>"); |
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300 | MODULE_DESCRIPTION("wm97xx continuous touch driver for mainstone"); |
301 | MODULE_LICENSE("GPL"); |