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864fe73c HCE |
1 | /* |
2 | * Atmel AT91 and AVR32 continuous touch screen driver for Wolfson WM97xx AC97 | |
3 | * codecs. | |
4 | * | |
5 | * Copyright (C) 2008 - 2009 Atmel Corporation | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify it | |
8 | * under the terms of the GNU General Public License version 2 as published by | |
9 | * the Free Software Foundation. | |
10 | */ | |
11 | #include <linux/module.h> | |
12 | #include <linux/moduleparam.h> | |
13 | #include <linux/kernel.h> | |
14 | #include <linux/init.h> | |
15 | #include <linux/delay.h> | |
16 | #include <linux/irq.h> | |
17 | #include <linux/interrupt.h> | |
18 | #include <linux/wm97xx.h> | |
19 | #include <linux/timer.h> | |
20 | #include <linux/gpio.h> | |
21 | #include <linux/io.h> | |
22 | ||
23 | #define AC97C_ICA 0x10 | |
24 | #define AC97C_CBRHR 0x30 | |
25 | #define AC97C_CBSR 0x38 | |
26 | #define AC97C_CBMR 0x3c | |
27 | #define AC97C_IER 0x54 | |
28 | #define AC97C_IDR 0x58 | |
29 | ||
30 | #define AC97C_RXRDY (1 << 4) | |
31 | #define AC97C_OVRUN (1 << 5) | |
32 | ||
33 | #define AC97C_CMR_SIZE_20 (0 << 16) | |
34 | #define AC97C_CMR_SIZE_18 (1 << 16) | |
35 | #define AC97C_CMR_SIZE_16 (2 << 16) | |
36 | #define AC97C_CMR_SIZE_10 (3 << 16) | |
37 | #define AC97C_CMR_CEM_LITTLE (1 << 18) | |
38 | #define AC97C_CMR_CEM_BIG (0 << 18) | |
39 | #define AC97C_CMR_CENA (1 << 21) | |
40 | ||
41 | #define AC97C_INT_CBEVT (1 << 4) | |
42 | ||
43 | #define AC97C_SR_CAEVT (1 << 3) | |
44 | ||
45 | #define AC97C_CH_MASK(slot) \ | |
46 | (0x7 << (3 * (slot - 3))) | |
47 | #define AC97C_CH_ASSIGN(slot, channel) \ | |
48 | (AC97C_CHANNEL_##channel << (3 * (slot - 3))) | |
49 | #define AC97C_CHANNEL_NONE 0x0 | |
50 | #define AC97C_CHANNEL_B 0x2 | |
51 | ||
52 | #define ac97c_writel(chip, reg, val) \ | |
53 | __raw_writel((val), (chip)->regs + AC97C_##reg) | |
54 | #define ac97c_readl(chip, reg) \ | |
55 | __raw_readl((chip)->regs + AC97C_##reg) | |
56 | ||
57 | #ifdef CONFIG_CPU_AT32AP700X | |
58 | #define ATMEL_WM97XX_AC97C_IOMEM (0xfff02800) | |
59 | #define ATMEL_WM97XX_AC97C_IRQ (29) | |
60 | #define ATMEL_WM97XX_GPIO_DEFAULT (32+16) /* Pin 16 on port B. */ | |
61 | #else | |
af901ca1 | 62 | #error Unknown CPU, this driver only supports AT32AP700X CPUs. |
864fe73c HCE |
63 | #endif |
64 | ||
65 | struct continuous { | |
66 | u16 id; /* codec id */ | |
67 | u8 code; /* continuous code */ | |
68 | u8 reads; /* number of coord reads per read cycle */ | |
69 | u32 speed; /* number of coords per second */ | |
70 | }; | |
71 | ||
72 | #define WM_READS(sp) ((sp / HZ) + 1) | |
73 | ||
74 | static const struct continuous cinfo[] = { | |
75 | {WM9705_ID2, 0, WM_READS(94), 94}, | |
76 | {WM9705_ID2, 1, WM_READS(188), 188}, | |
77 | {WM9705_ID2, 2, WM_READS(375), 375}, | |
78 | {WM9705_ID2, 3, WM_READS(750), 750}, | |
79 | {WM9712_ID2, 0, WM_READS(94), 94}, | |
80 | {WM9712_ID2, 1, WM_READS(188), 188}, | |
81 | {WM9712_ID2, 2, WM_READS(375), 375}, | |
82 | {WM9712_ID2, 3, WM_READS(750), 750}, | |
83 | {WM9713_ID2, 0, WM_READS(94), 94}, | |
84 | {WM9713_ID2, 1, WM_READS(120), 120}, | |
85 | {WM9713_ID2, 2, WM_READS(154), 154}, | |
86 | {WM9713_ID2, 3, WM_READS(188), 188}, | |
87 | }; | |
88 | ||
89 | /* Continuous speed index. */ | |
90 | static int sp_idx; | |
91 | ||
92 | /* | |
93 | * Pen sampling frequency (Hz) in continuous mode. | |
94 | */ | |
95 | static int cont_rate = 188; | |
96 | module_param(cont_rate, int, 0); | |
97 | MODULE_PARM_DESC(cont_rate, "Sampling rate in continuous mode (Hz)"); | |
98 | ||
99 | /* | |
100 | * Pen down detection. | |
101 | * | |
102 | * This driver can either poll or use an interrupt to indicate a pen down | |
103 | * event. If the irq request fails then it will fall back to polling mode. | |
104 | */ | |
105 | static int pen_int = 1; | |
106 | module_param(pen_int, int, 0); | |
107 | MODULE_PARM_DESC(pen_int, "Pen down detection (1 = interrupt, 0 = polling)"); | |
108 | ||
109 | /* | |
110 | * Pressure readback. | |
111 | * | |
112 | * Set to 1 to read back pen down pressure. | |
113 | */ | |
114 | static int pressure; | |
115 | module_param(pressure, int, 0); | |
116 | MODULE_PARM_DESC(pressure, "Pressure readback (1 = pressure, 0 = no pressure)"); | |
117 | ||
118 | /* | |
119 | * AC97 touch data slot. | |
120 | * | |
121 | * Touch screen readback data ac97 slot. | |
122 | */ | |
123 | static int ac97_touch_slot = 5; | |
124 | module_param(ac97_touch_slot, int, 0); | |
125 | MODULE_PARM_DESC(ac97_touch_slot, "Touch screen data slot AC97 number"); | |
126 | ||
127 | /* | |
128 | * GPIO line number. | |
129 | * | |
130 | * Set to GPIO number where the signal from the WM97xx device is hooked up. | |
131 | */ | |
132 | static int atmel_gpio_line = ATMEL_WM97XX_GPIO_DEFAULT; | |
133 | module_param(atmel_gpio_line, int, 0); | |
134 | MODULE_PARM_DESC(atmel_gpio_line, "GPIO line number connected to WM97xx"); | |
135 | ||
136 | struct atmel_wm97xx { | |
137 | struct wm97xx *wm; | |
138 | struct timer_list pen_timer; | |
139 | void __iomem *regs; | |
140 | unsigned long ac97c_irq; | |
141 | unsigned long gpio_pen; | |
142 | unsigned long gpio_irq; | |
143 | unsigned short x; | |
144 | unsigned short y; | |
145 | }; | |
146 | ||
147 | static irqreturn_t atmel_wm97xx_channel_b_interrupt(int irq, void *dev_id) | |
148 | { | |
149 | struct atmel_wm97xx *atmel_wm97xx = dev_id; | |
150 | struct wm97xx *wm = atmel_wm97xx->wm; | |
151 | int status = ac97c_readl(atmel_wm97xx, CBSR); | |
152 | irqreturn_t retval = IRQ_NONE; | |
153 | ||
154 | if (status & AC97C_OVRUN) { | |
155 | dev_dbg(&wm->touch_dev->dev, "AC97C overrun\n"); | |
156 | ac97c_readl(atmel_wm97xx, CBRHR); | |
157 | retval = IRQ_HANDLED; | |
158 | } else if (status & AC97C_RXRDY) { | |
159 | u16 data; | |
160 | u16 value; | |
161 | u16 source; | |
162 | u16 pen_down; | |
163 | ||
164 | data = ac97c_readl(atmel_wm97xx, CBRHR); | |
165 | value = data & 0x0fff; | |
166 | source = data & WM97XX_ADCSRC_MASK; | |
167 | pen_down = (data & WM97XX_PEN_DOWN) >> 8; | |
168 | ||
169 | if (source == WM97XX_ADCSEL_X) | |
170 | atmel_wm97xx->x = value; | |
171 | if (source == WM97XX_ADCSEL_Y) | |
172 | atmel_wm97xx->y = value; | |
173 | ||
174 | if (!pressure && source == WM97XX_ADCSEL_Y) { | |
175 | input_report_abs(wm->input_dev, ABS_X, atmel_wm97xx->x); | |
176 | input_report_abs(wm->input_dev, ABS_Y, atmel_wm97xx->y); | |
177 | input_report_key(wm->input_dev, BTN_TOUCH, pen_down); | |
178 | input_sync(wm->input_dev); | |
179 | } else if (pressure && source == WM97XX_ADCSEL_PRES) { | |
180 | input_report_abs(wm->input_dev, ABS_X, atmel_wm97xx->x); | |
181 | input_report_abs(wm->input_dev, ABS_Y, atmel_wm97xx->y); | |
182 | input_report_abs(wm->input_dev, ABS_PRESSURE, value); | |
183 | input_report_key(wm->input_dev, BTN_TOUCH, value); | |
184 | input_sync(wm->input_dev); | |
185 | } | |
186 | ||
187 | retval = IRQ_HANDLED; | |
188 | } | |
189 | ||
190 | return retval; | |
191 | } | |
192 | ||
193 | static void atmel_wm97xx_acc_pen_up(struct wm97xx *wm) | |
194 | { | |
195 | struct atmel_wm97xx *atmel_wm97xx = platform_get_drvdata(wm->touch_dev); | |
196 | struct input_dev *input_dev = wm->input_dev; | |
197 | int pen_down = gpio_get_value(atmel_wm97xx->gpio_pen); | |
198 | ||
199 | if (pen_down != 0) { | |
200 | mod_timer(&atmel_wm97xx->pen_timer, | |
201 | jiffies + msecs_to_jiffies(1)); | |
202 | } else { | |
203 | if (pressure) | |
204 | input_report_abs(input_dev, ABS_PRESSURE, 0); | |
205 | input_report_key(input_dev, BTN_TOUCH, 0); | |
206 | input_sync(input_dev); | |
207 | } | |
208 | } | |
209 | ||
210 | static void atmel_wm97xx_pen_timer(unsigned long data) | |
211 | { | |
212 | atmel_wm97xx_acc_pen_up((struct wm97xx *)data); | |
213 | } | |
214 | ||
215 | static int atmel_wm97xx_acc_startup(struct wm97xx *wm) | |
216 | { | |
217 | struct atmel_wm97xx *atmel_wm97xx = platform_get_drvdata(wm->touch_dev); | |
218 | int idx = 0; | |
219 | ||
220 | if (wm->ac97 == NULL) | |
221 | return -ENODEV; | |
222 | ||
223 | for (idx = 0; idx < ARRAY_SIZE(cinfo); idx++) { | |
224 | if (wm->id != cinfo[idx].id) | |
225 | continue; | |
226 | ||
227 | sp_idx = idx; | |
228 | ||
229 | if (cont_rate <= cinfo[idx].speed) | |
230 | break; | |
231 | } | |
232 | ||
233 | wm->acc_rate = cinfo[sp_idx].code; | |
234 | wm->acc_slot = ac97_touch_slot; | |
235 | dev_info(&wm->touch_dev->dev, "atmel accelerated touchscreen driver, " | |
236 | "%d samples/sec\n", cinfo[sp_idx].speed); | |
237 | ||
238 | if (pen_int) { | |
239 | unsigned long reg; | |
240 | ||
241 | wm->pen_irq = atmel_wm97xx->gpio_irq; | |
242 | ||
243 | switch (wm->id) { | |
244 | case WM9712_ID2: /* Fall through. */ | |
245 | case WM9713_ID2: | |
246 | /* | |
247 | * Use GPIO 13 (PEN_DOWN) to assert GPIO line 3 | |
248 | * (PENDOWN). | |
249 | */ | |
250 | wm97xx_config_gpio(wm, WM97XX_GPIO_13, WM97XX_GPIO_IN, | |
251 | WM97XX_GPIO_POL_HIGH, | |
252 | WM97XX_GPIO_STICKY, | |
253 | WM97XX_GPIO_WAKE); | |
254 | wm97xx_config_gpio(wm, WM97XX_GPIO_3, WM97XX_GPIO_OUT, | |
255 | WM97XX_GPIO_POL_HIGH, | |
256 | WM97XX_GPIO_NOTSTICKY, | |
257 | WM97XX_GPIO_NOWAKE); | |
258 | case WM9705_ID2: /* Fall through. */ | |
259 | /* | |
260 | * Enable touch data slot in AC97 controller channel B. | |
261 | */ | |
262 | reg = ac97c_readl(atmel_wm97xx, ICA); | |
263 | reg &= ~AC97C_CH_MASK(wm->acc_slot); | |
264 | reg |= AC97C_CH_ASSIGN(wm->acc_slot, B); | |
265 | ac97c_writel(atmel_wm97xx, ICA, reg); | |
266 | ||
267 | /* | |
268 | * Enable channel and interrupt for RXRDY and OVERRUN. | |
269 | */ | |
270 | ac97c_writel(atmel_wm97xx, CBMR, AC97C_CMR_CENA | |
271 | | AC97C_CMR_CEM_BIG | |
272 | | AC97C_CMR_SIZE_16 | |
273 | | AC97C_OVRUN | |
274 | | AC97C_RXRDY); | |
275 | /* Dummy read to empty RXRHR. */ | |
276 | ac97c_readl(atmel_wm97xx, CBRHR); | |
277 | /* | |
278 | * Enable interrupt for channel B in the AC97 | |
279 | * controller. | |
280 | */ | |
281 | ac97c_writel(atmel_wm97xx, IER, AC97C_INT_CBEVT); | |
282 | break; | |
283 | default: | |
284 | dev_err(&wm->touch_dev->dev, "pen down irq not " | |
285 | "supported on this device\n"); | |
286 | pen_int = 0; | |
287 | break; | |
288 | } | |
289 | } | |
290 | ||
291 | return 0; | |
292 | } | |
293 | ||
294 | static void atmel_wm97xx_acc_shutdown(struct wm97xx *wm) | |
295 | { | |
296 | if (pen_int) { | |
297 | struct atmel_wm97xx *atmel_wm97xx = | |
298 | platform_get_drvdata(wm->touch_dev); | |
299 | unsigned long ica; | |
300 | ||
301 | switch (wm->id & 0xffff) { | |
302 | case WM9705_ID2: /* Fall through. */ | |
303 | case WM9712_ID2: /* Fall through. */ | |
304 | case WM9713_ID2: | |
305 | /* Disable slot and turn off channel B interrupts. */ | |
306 | ica = ac97c_readl(atmel_wm97xx, ICA); | |
307 | ica &= ~AC97C_CH_MASK(wm->acc_slot); | |
308 | ac97c_writel(atmel_wm97xx, ICA, ica); | |
309 | ac97c_writel(atmel_wm97xx, IDR, AC97C_INT_CBEVT); | |
310 | ac97c_writel(atmel_wm97xx, CBMR, 0); | |
311 | wm->pen_irq = 0; | |
312 | break; | |
313 | default: | |
314 | dev_err(&wm->touch_dev->dev, "unknown codec\n"); | |
315 | break; | |
316 | } | |
317 | } | |
318 | } | |
319 | ||
320 | static void atmel_wm97xx_irq_enable(struct wm97xx *wm, int enable) | |
321 | { | |
322 | /* Intentionally left empty. */ | |
323 | } | |
324 | ||
325 | static struct wm97xx_mach_ops atmel_mach_ops = { | |
326 | .acc_enabled = 1, | |
327 | .acc_pen_up = atmel_wm97xx_acc_pen_up, | |
328 | .acc_startup = atmel_wm97xx_acc_startup, | |
329 | .acc_shutdown = atmel_wm97xx_acc_shutdown, | |
330 | .irq_enable = atmel_wm97xx_irq_enable, | |
331 | .irq_gpio = WM97XX_GPIO_3, | |
332 | }; | |
333 | ||
334 | static int __init atmel_wm97xx_probe(struct platform_device *pdev) | |
335 | { | |
336 | struct wm97xx *wm = platform_get_drvdata(pdev); | |
337 | struct atmel_wm97xx *atmel_wm97xx; | |
338 | int ret; | |
339 | ||
340 | atmel_wm97xx = kzalloc(sizeof(struct atmel_wm97xx), GFP_KERNEL); | |
341 | if (!atmel_wm97xx) { | |
342 | dev_dbg(&pdev->dev, "out of memory\n"); | |
343 | return -ENOMEM; | |
344 | } | |
345 | ||
346 | atmel_wm97xx->wm = wm; | |
347 | atmel_wm97xx->regs = (void *)ATMEL_WM97XX_AC97C_IOMEM; | |
348 | atmel_wm97xx->ac97c_irq = ATMEL_WM97XX_AC97C_IRQ; | |
349 | atmel_wm97xx->gpio_pen = atmel_gpio_line; | |
350 | atmel_wm97xx->gpio_irq = gpio_to_irq(atmel_wm97xx->gpio_pen); | |
351 | ||
352 | setup_timer(&atmel_wm97xx->pen_timer, atmel_wm97xx_pen_timer, | |
353 | (unsigned long)wm); | |
354 | ||
355 | ret = request_irq(atmel_wm97xx->ac97c_irq, | |
356 | atmel_wm97xx_channel_b_interrupt, | |
357 | IRQF_SHARED, "atmel-wm97xx-ch-b", atmel_wm97xx); | |
358 | if (ret) { | |
359 | dev_dbg(&pdev->dev, "could not request ac97c irq\n"); | |
360 | goto err; | |
361 | } | |
362 | ||
363 | platform_set_drvdata(pdev, atmel_wm97xx); | |
364 | ||
365 | ret = wm97xx_register_mach_ops(wm, &atmel_mach_ops); | |
366 | if (ret) | |
367 | goto err_irq; | |
368 | ||
369 | return ret; | |
370 | ||
371 | err_irq: | |
372 | free_irq(atmel_wm97xx->ac97c_irq, atmel_wm97xx); | |
373 | err: | |
374 | platform_set_drvdata(pdev, NULL); | |
375 | kfree(atmel_wm97xx); | |
376 | return ret; | |
377 | } | |
378 | ||
379 | static int __exit atmel_wm97xx_remove(struct platform_device *pdev) | |
380 | { | |
381 | struct atmel_wm97xx *atmel_wm97xx = platform_get_drvdata(pdev); | |
382 | struct wm97xx *wm = atmel_wm97xx->wm; | |
383 | ||
384 | ac97c_writel(atmel_wm97xx, IDR, AC97C_INT_CBEVT); | |
385 | free_irq(atmel_wm97xx->ac97c_irq, atmel_wm97xx); | |
386 | del_timer_sync(&atmel_wm97xx->pen_timer); | |
387 | wm97xx_unregister_mach_ops(wm); | |
388 | platform_set_drvdata(pdev, NULL); | |
389 | kfree(atmel_wm97xx); | |
390 | ||
391 | return 0; | |
392 | } | |
393 | ||
394 | #ifdef CONFIG_PM | |
395 | static int atmel_wm97xx_suspend(struct platform_device *pdev, pm_message_t msg) | |
396 | { | |
397 | struct atmel_wm97xx *atmel_wm97xx = platform_get_drvdata(pdev); | |
398 | ||
399 | ac97c_writel(atmel_wm97xx, IDR, AC97C_INT_CBEVT); | |
400 | disable_irq(atmel_wm97xx->gpio_irq); | |
401 | del_timer_sync(&atmel_wm97xx->pen_timer); | |
402 | ||
403 | return 0; | |
404 | } | |
405 | ||
406 | static int atmel_wm97xx_resume(struct platform_device *pdev) | |
407 | { | |
408 | struct atmel_wm97xx *atmel_wm97xx = platform_get_drvdata(pdev); | |
409 | struct wm97xx *wm = atmel_wm97xx->wm; | |
410 | ||
411 | if (wm->input_dev->users) { | |
412 | enable_irq(atmel_wm97xx->gpio_irq); | |
413 | ac97c_writel(atmel_wm97xx, IER, AC97C_INT_CBEVT); | |
414 | } | |
415 | ||
416 | return 0; | |
417 | } | |
418 | #else | |
419 | #define atmel_wm97xx_suspend NULL | |
420 | #define atmel_wm97xx_resume NULL | |
421 | #endif | |
422 | ||
423 | static struct platform_driver atmel_wm97xx_driver = { | |
424 | .remove = __exit_p(atmel_wm97xx_remove), | |
425 | .driver = { | |
426 | .name = "wm97xx-touch", | |
427 | }, | |
428 | .suspend = atmel_wm97xx_suspend, | |
429 | .resume = atmel_wm97xx_resume, | |
430 | }; | |
431 | ||
432 | static int __init atmel_wm97xx_init(void) | |
433 | { | |
434 | return platform_driver_probe(&atmel_wm97xx_driver, atmel_wm97xx_probe); | |
435 | } | |
436 | module_init(atmel_wm97xx_init); | |
437 | ||
438 | static void __exit atmel_wm97xx_exit(void) | |
439 | { | |
440 | platform_driver_unregister(&atmel_wm97xx_driver); | |
441 | } | |
442 | module_exit(atmel_wm97xx_exit); | |
443 | ||
444 | MODULE_AUTHOR("Hans-Christian Egtvedt <hans-christian.egtvedt@atmel.com>"); | |
445 | MODULE_DESCRIPTION("wm97xx continuous touch driver for Atmel AT91 and AVR32"); | |
446 | MODULE_LICENSE("GPL"); |