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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 |
4db8a5f2 MB |
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> | |
4db8a5f2 | 27 | #include <linux/kernel.h> |
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28 | #include <linux/delay.h> |
29 | #include <linux/irq.h> | |
30 | #include <linux/interrupt.h> | |
31 | #include <linux/wm97xx.h> | |
32 | #include <linux/io.h> | |
b833306f MV |
33 | #include <linux/gpio.h> |
34 | ||
1f017a99 | 35 | #include <mach/regs-ac97.h> |
4db8a5f2 | 36 | |
b833306f | 37 | #include <asm/mach-types.h> |
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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; | |
b833306f | 66 | static int irq; |
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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 | { | |
180deb50 JS |
116 | unsigned int count; |
117 | ||
4db8a5f2 MB |
118 | schedule_timeout_uninterruptible(1); |
119 | ||
180deb50 | 120 | for (count = 0; count < 16; count++) |
4db8a5f2 | 121 | MODR; |
4db8a5f2 MB |
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 | |
af901ca1 | 133 | * threshold set to use the notifications it gives. |
4db8a5f2 MB |
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 | ||
dcfc32ba MB |
155 | dev_dbg(wm->dev, "Raw coordinates: x=%x, y=%x, p=%x\n", |
156 | x, y, p); | |
157 | ||
4db8a5f2 | 158 | /* are samples valid */ |
2456689b WS |
159 | if ((x & WM97XX_ADCSEL_MASK) != WM97XX_ADCSEL_X || |
160 | (y & WM97XX_ADCSEL_MASK) != WM97XX_ADCSEL_Y || | |
161 | (p & WM97XX_ADCSEL_MASK) != WM97XX_ADCSEL_PRES) | |
4db8a5f2 MB |
162 | goto up; |
163 | ||
164 | /* coordinate is good */ | |
165 | tries = 0; | |
166 | input_report_abs(wm->input_dev, ABS_X, x & 0xfff); | |
167 | input_report_abs(wm->input_dev, ABS_Y, y & 0xfff); | |
168 | input_report_abs(wm->input_dev, ABS_PRESSURE, p & 0xfff); | |
cd2d64b1 | 169 | input_report_key(wm->input_dev, BTN_TOUCH, (p != 0)); |
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170 | input_sync(wm->input_dev); |
171 | reads++; | |
172 | } while (reads < cinfo[sp_idx].reads); | |
173 | up: | |
174 | return RC_PENDOWN | RC_AGAIN; | |
175 | } | |
176 | ||
177 | static int wm97xx_acc_startup(struct wm97xx *wm) | |
178 | { | |
b833306f | 179 | int idx = 0, ret = 0; |
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180 | |
181 | /* check we have a codec */ | |
182 | if (wm->ac97 == NULL) | |
183 | return -ENODEV; | |
184 | ||
185 | /* Go you big red fire engine */ | |
186 | for (idx = 0; idx < ARRAY_SIZE(cinfo); idx++) { | |
187 | if (wm->id != cinfo[idx].id) | |
188 | continue; | |
189 | sp_idx = idx; | |
190 | if (cont_rate <= cinfo[idx].speed) | |
191 | break; | |
192 | } | |
193 | wm->acc_rate = cinfo[sp_idx].code; | |
194 | wm->acc_slot = ac97_touch_slot; | |
195 | dev_info(wm->dev, | |
196 | "mainstone accelerated touchscreen driver, %d samples/sec\n", | |
197 | cinfo[sp_idx].speed); | |
198 | ||
b833306f MV |
199 | /* IRQ driven touchscreen is used on Palm hardware */ |
200 | if (machine_is_palmt5() || machine_is_palmtx() || machine_is_palmld()) { | |
201 | pen_int = 1; | |
202 | irq = 27; | |
99fde513 MV |
203 | /* There is some obscure mutant of WM9712 interbred with WM9713 |
204 | * used on Palm HW */ | |
205 | wm->variant = WM97xx_WM1613; | |
b833306f MV |
206 | } else if (machine_is_mainstone() && pen_int) |
207 | irq = 4; | |
208 | ||
209 | if (irq) { | |
210 | ret = gpio_request(irq, "Touchscreen IRQ"); | |
211 | if (ret) | |
212 | goto out; | |
213 | ||
214 | ret = gpio_direction_input(irq); | |
215 | if (ret) { | |
216 | gpio_free(irq); | |
217 | goto out; | |
218 | } | |
219 | ||
220 | wm->pen_irq = gpio_to_irq(irq); | |
dced35ae | 221 | irq_set_irq_type(wm->pen_irq, IRQ_TYPE_EDGE_BOTH); |
b833306f MV |
222 | } else /* pen irq not supported */ |
223 | pen_int = 0; | |
224 | ||
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225 | /* codec specific irq config */ |
226 | if (pen_int) { | |
227 | switch (wm->id) { | |
228 | case WM9705_ID2: | |
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229 | break; |
230 | case WM9712_ID2: | |
231 | case WM9713_ID2: | |
4db8a5f2 | 232 | /* use PEN_DOWN GPIO 13 to assert IRQ on GPIO line 2 */ |
4db8a5f2 MB |
233 | wm97xx_config_gpio(wm, WM97XX_GPIO_13, WM97XX_GPIO_IN, |
234 | WM97XX_GPIO_POL_HIGH, | |
235 | WM97XX_GPIO_STICKY, | |
236 | WM97XX_GPIO_WAKE); | |
237 | wm97xx_config_gpio(wm, WM97XX_GPIO_2, WM97XX_GPIO_OUT, | |
238 | WM97XX_GPIO_POL_HIGH, | |
239 | WM97XX_GPIO_NOTSTICKY, | |
240 | WM97XX_GPIO_NOWAKE); | |
241 | break; | |
242 | default: | |
243 | dev_err(wm->dev, | |
244 | "pen down irq not supported on this device\n"); | |
245 | pen_int = 0; | |
246 | break; | |
247 | } | |
248 | } | |
249 | ||
b833306f MV |
250 | out: |
251 | return ret; | |
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252 | } |
253 | ||
254 | static void wm97xx_acc_shutdown(struct wm97xx *wm) | |
255 | { | |
256 | /* codec specific deconfig */ | |
257 | if (pen_int) { | |
b833306f MV |
258 | if (irq) |
259 | gpio_free(irq); | |
260 | wm->pen_irq = 0; | |
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261 | } |
262 | } | |
263 | ||
264 | static void wm97xx_irq_enable(struct wm97xx *wm, int enable) | |
265 | { | |
266 | if (enable) | |
267 | enable_irq(wm->pen_irq); | |
268 | else | |
a700e72d | 269 | disable_irq_nosync(wm->pen_irq); |
4db8a5f2 MB |
270 | } |
271 | ||
272 | static struct wm97xx_mach_ops mainstone_mach_ops = { | |
273 | .acc_enabled = 1, | |
274 | .acc_pen_up = wm97xx_acc_pen_up, | |
275 | .acc_pen_down = wm97xx_acc_pen_down, | |
276 | .acc_startup = wm97xx_acc_startup, | |
277 | .acc_shutdown = wm97xx_acc_shutdown, | |
278 | .irq_enable = wm97xx_irq_enable, | |
279 | .irq_gpio = WM97XX_GPIO_2, | |
280 | }; | |
281 | ||
282 | static int mainstone_wm97xx_probe(struct platform_device *pdev) | |
283 | { | |
284 | struct wm97xx *wm = platform_get_drvdata(pdev); | |
285 | ||
286 | return wm97xx_register_mach_ops(wm, &mainstone_mach_ops); | |
287 | } | |
288 | ||
289 | static int mainstone_wm97xx_remove(struct platform_device *pdev) | |
290 | { | |
291 | struct wm97xx *wm = platform_get_drvdata(pdev); | |
292 | ||
293 | wm97xx_unregister_mach_ops(wm); | |
294 | return 0; | |
295 | } | |
296 | ||
297 | static struct platform_driver mainstone_wm97xx_driver = { | |
298 | .probe = mainstone_wm97xx_probe, | |
299 | .remove = mainstone_wm97xx_remove, | |
300 | .driver = { | |
301 | .name = "wm97xx-touch", | |
302 | }, | |
303 | }; | |
cdcc96e2 | 304 | module_platform_driver(mainstone_wm97xx_driver); |
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305 | |
306 | /* Module information */ | |
b8d055a8 | 307 | MODULE_AUTHOR("Liam Girdwood <lrg@slimlogic.co.uk>"); |
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308 | MODULE_DESCRIPTION("wm97xx continuous touch driver for mainstone"); |
309 | MODULE_LICENSE("GPL"); |