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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 | |
7 | * liam.girdwood@wolfsonmicro.com or linux@wolfsonmicro.com | |
8 | * Parts Copyright : Ian Molton <spyro@f2s.com> | |
9 | * Andrew Zabolotny <zap@homelink.ru> | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify it | |
12 | * under the terms of the GNU General Public License as published by the | |
13 | * Free Software Foundation; either version 2 of the License, or (at your | |
14 | * option) any later version. | |
15 | * | |
16 | * Notes: | |
17 | * This is a wm97xx extended touch driver to capture touch | |
18 | * data in a continuous manner on the Intel XScale archictecture | |
19 | * | |
20 | * Features: | |
21 | * - codecs supported:- WM9705, WM9712, WM9713 | |
22 | * - processors supported:- Intel XScale PXA25x, PXA26x, PXA27x | |
23 | * | |
24 | */ | |
25 | ||
26 | #include <linux/module.h> | |
27 | #include <linux/moduleparam.h> | |
28 | #include <linux/version.h> | |
29 | #include <linux/kernel.h> | |
30 | #include <linux/init.h> | |
31 | #include <linux/delay.h> | |
32 | #include <linux/irq.h> | |
33 | #include <linux/interrupt.h> | |
34 | #include <linux/wm97xx.h> | |
35 | #include <linux/io.h> | |
36 | #include <asm/arch/pxa-regs.h> | |
37 | ||
38 | #define VERSION "0.13" | |
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; | |
67 | ||
68 | /* | |
69 | * Pen sampling frequency (Hz) in continuous mode. | |
70 | */ | |
71 | static int cont_rate = 200; | |
72 | module_param(cont_rate, int, 0); | |
73 | MODULE_PARM_DESC(cont_rate, "Sampling rate in continuous mode (Hz)"); | |
74 | ||
75 | /* | |
76 | * Pen down detection. | |
77 | * | |
78 | * This driver can either poll or use an interrupt to indicate a pen down | |
79 | * event. If the irq request fails then it will fall back to polling mode. | |
80 | */ | |
81 | static int pen_int; | |
82 | module_param(pen_int, int, 0); | |
83 | MODULE_PARM_DESC(pen_int, "Pen down detection (1 = interrupt, 0 = polling)"); | |
84 | ||
85 | /* | |
86 | * Pressure readback. | |
87 | * | |
88 | * Set to 1 to read back pen down pressure | |
89 | */ | |
90 | static int pressure; | |
91 | module_param(pressure, int, 0); | |
92 | MODULE_PARM_DESC(pressure, "Pressure readback (1 = pressure, 0 = no pressure)"); | |
93 | ||
94 | /* | |
95 | * AC97 touch data slot. | |
96 | * | |
97 | * Touch screen readback data ac97 slot | |
98 | */ | |
99 | static int ac97_touch_slot = 5; | |
100 | module_param(ac97_touch_slot, int, 0); | |
101 | MODULE_PARM_DESC(ac97_touch_slot, "Touch screen data slot AC97 number"); | |
102 | ||
103 | ||
104 | /* flush AC97 slot 5 FIFO on pxa machines */ | |
105 | #ifdef CONFIG_PXA27x | |
106 | static void wm97xx_acc_pen_up(struct wm97xx *wm) | |
107 | { | |
108 | schedule_timeout_uninterruptible(1); | |
109 | ||
110 | while (MISR & (1 << 2)) | |
111 | MODR; | |
112 | } | |
113 | #else | |
114 | static void wm97xx_acc_pen_up(struct wm97xx *wm) | |
115 | { | |
116 | int count = 16; | |
117 | schedule_timeout_uninterruptible(1); | |
118 | ||
119 | while (count < 16) { | |
120 | MODR; | |
121 | count--; | |
122 | } | |
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 | |
134 | * threashold 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 | /* 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); | |
167 | input_sync(wm->input_dev); | |
168 | reads++; | |
169 | } while (reads < cinfo[sp_idx].reads); | |
170 | up: | |
171 | return RC_PENDOWN | RC_AGAIN; | |
172 | } | |
173 | ||
174 | static int wm97xx_acc_startup(struct wm97xx *wm) | |
175 | { | |
176 | int idx = 0; | |
177 | ||
178 | /* check we have a codec */ | |
179 | if (wm->ac97 == NULL) | |
180 | return -ENODEV; | |
181 | ||
182 | /* Go you big red fire engine */ | |
183 | for (idx = 0; idx < ARRAY_SIZE(cinfo); idx++) { | |
184 | if (wm->id != cinfo[idx].id) | |
185 | continue; | |
186 | sp_idx = idx; | |
187 | if (cont_rate <= cinfo[idx].speed) | |
188 | break; | |
189 | } | |
190 | wm->acc_rate = cinfo[sp_idx].code; | |
191 | wm->acc_slot = ac97_touch_slot; | |
192 | dev_info(wm->dev, | |
193 | "mainstone accelerated touchscreen driver, %d samples/sec\n", | |
194 | cinfo[sp_idx].speed); | |
195 | ||
196 | /* codec specific irq config */ | |
197 | if (pen_int) { | |
198 | switch (wm->id) { | |
199 | case WM9705_ID2: | |
200 | wm->pen_irq = IRQ_GPIO(4); | |
6cab4860 | 201 | set_irq_type(IRQ_GPIO(4), IRQ_TYPE_EDGE_BOTH); |
4db8a5f2 MB |
202 | break; |
203 | case WM9712_ID2: | |
204 | case WM9713_ID2: | |
205 | /* enable pen down interrupt */ | |
206 | /* use PEN_DOWN GPIO 13 to assert IRQ on GPIO line 2 */ | |
207 | wm->pen_irq = MAINSTONE_AC97_IRQ; | |
208 | wm97xx_config_gpio(wm, WM97XX_GPIO_13, WM97XX_GPIO_IN, | |
209 | WM97XX_GPIO_POL_HIGH, | |
210 | WM97XX_GPIO_STICKY, | |
211 | WM97XX_GPIO_WAKE); | |
212 | wm97xx_config_gpio(wm, WM97XX_GPIO_2, WM97XX_GPIO_OUT, | |
213 | WM97XX_GPIO_POL_HIGH, | |
214 | WM97XX_GPIO_NOTSTICKY, | |
215 | WM97XX_GPIO_NOWAKE); | |
216 | break; | |
217 | default: | |
218 | dev_err(wm->dev, | |
219 | "pen down irq not supported on this device\n"); | |
220 | pen_int = 0; | |
221 | break; | |
222 | } | |
223 | } | |
224 | ||
225 | return 0; | |
226 | } | |
227 | ||
228 | static void wm97xx_acc_shutdown(struct wm97xx *wm) | |
229 | { | |
230 | /* codec specific deconfig */ | |
231 | if (pen_int) { | |
232 | switch (wm->id & 0xffff) { | |
233 | case WM9705_ID2: | |
234 | wm->pen_irq = 0; | |
235 | break; | |
236 | case WM9712_ID2: | |
237 | case WM9713_ID2: | |
238 | /* disable interrupt */ | |
239 | wm->pen_irq = 0; | |
240 | break; | |
241 | } | |
242 | } | |
243 | } | |
244 | ||
245 | static void wm97xx_irq_enable(struct wm97xx *wm, int enable) | |
246 | { | |
247 | if (enable) | |
248 | enable_irq(wm->pen_irq); | |
249 | else | |
250 | disable_irq(wm->pen_irq); | |
251 | } | |
252 | ||
253 | static struct wm97xx_mach_ops mainstone_mach_ops = { | |
254 | .acc_enabled = 1, | |
255 | .acc_pen_up = wm97xx_acc_pen_up, | |
256 | .acc_pen_down = wm97xx_acc_pen_down, | |
257 | .acc_startup = wm97xx_acc_startup, | |
258 | .acc_shutdown = wm97xx_acc_shutdown, | |
259 | .irq_enable = wm97xx_irq_enable, | |
260 | .irq_gpio = WM97XX_GPIO_2, | |
261 | }; | |
262 | ||
263 | static int mainstone_wm97xx_probe(struct platform_device *pdev) | |
264 | { | |
265 | struct wm97xx *wm = platform_get_drvdata(pdev); | |
266 | ||
267 | return wm97xx_register_mach_ops(wm, &mainstone_mach_ops); | |
268 | } | |
269 | ||
270 | static int mainstone_wm97xx_remove(struct platform_device *pdev) | |
271 | { | |
272 | struct wm97xx *wm = platform_get_drvdata(pdev); | |
273 | ||
274 | wm97xx_unregister_mach_ops(wm); | |
275 | return 0; | |
276 | } | |
277 | ||
278 | static struct platform_driver mainstone_wm97xx_driver = { | |
279 | .probe = mainstone_wm97xx_probe, | |
280 | .remove = mainstone_wm97xx_remove, | |
281 | .driver = { | |
282 | .name = "wm97xx-touch", | |
283 | }, | |
284 | }; | |
285 | ||
286 | static int __init mainstone_wm97xx_init(void) | |
287 | { | |
288 | return platform_driver_register(&mainstone_wm97xx_driver); | |
289 | } | |
290 | ||
291 | static void __exit mainstone_wm97xx_exit(void) | |
292 | { | |
293 | platform_driver_unregister(&mainstone_wm97xx_driver); | |
294 | } | |
295 | ||
296 | module_init(mainstone_wm97xx_init); | |
297 | module_exit(mainstone_wm97xx_exit); | |
298 | ||
299 | /* Module information */ | |
300 | MODULE_AUTHOR("Liam Girdwood <liam.girdwood@wolfsonmicro.com>"); | |
301 | MODULE_DESCRIPTION("wm97xx continuous touch driver for mainstone"); | |
302 | MODULE_LICENSE("GPL"); |