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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#include <linux/slab.h>
23
24#define AC97C_ICA 0x10
25#define AC97C_CBRHR 0x30
26#define AC97C_CBSR 0x38
27#define AC97C_CBMR 0x3c
28#define AC97C_IER 0x54
29#define AC97C_IDR 0x58
30
31#define AC97C_RXRDY (1 << 4)
32#define AC97C_OVRUN (1 << 5)
33
34#define AC97C_CMR_SIZE_20 (0 << 16)
35#define AC97C_CMR_SIZE_18 (1 << 16)
36#define AC97C_CMR_SIZE_16 (2 << 16)
37#define AC97C_CMR_SIZE_10 (3 << 16)
38#define AC97C_CMR_CEM_LITTLE (1 << 18)
39#define AC97C_CMR_CEM_BIG (0 << 18)
40#define AC97C_CMR_CENA (1 << 21)
41
42#define AC97C_INT_CBEVT (1 << 4)
43
44#define AC97C_SR_CAEVT (1 << 3)
45
46#define AC97C_CH_MASK(slot) \
47 (0x7 << (3 * (slot - 3)))
48#define AC97C_CH_ASSIGN(slot, channel) \
49 (AC97C_CHANNEL_##channel << (3 * (slot - 3)))
50#define AC97C_CHANNEL_NONE 0x0
51#define AC97C_CHANNEL_B 0x2
52
53#define ac97c_writel(chip, reg, val) \
54 __raw_writel((val), (chip)->regs + AC97C_##reg)
55#define ac97c_readl(chip, reg) \
56 __raw_readl((chip)->regs + AC97C_##reg)
57
58#ifdef CONFIG_CPU_AT32AP700X
59#define ATMEL_WM97XX_AC97C_IOMEM (0xfff02800)
60#define ATMEL_WM97XX_AC97C_IRQ (29)
61#define ATMEL_WM97XX_GPIO_DEFAULT (32+16)
62#else
63#error Unknown CPU, this driver only supports AT32AP700X CPUs.
64#endif
65
66struct continuous {
67 u16 id;
68 u8 code;
69 u8 reads;
70 u32 speed;
71};
72
73#define WM_READS(sp) ((sp / HZ) + 1)
74
75static const struct continuous cinfo[] = {
76 {WM9705_ID2, 0, WM_READS(94), 94},
77 {WM9705_ID2, 1, WM_READS(188), 188},
78 {WM9705_ID2, 2, WM_READS(375), 375},
79 {WM9705_ID2, 3, WM_READS(750), 750},
80 {WM9712_ID2, 0, WM_READS(94), 94},
81 {WM9712_ID2, 1, WM_READS(188), 188},
82 {WM9712_ID2, 2, WM_READS(375), 375},
83 {WM9712_ID2, 3, WM_READS(750), 750},
84 {WM9713_ID2, 0, WM_READS(94), 94},
85 {WM9713_ID2, 1, WM_READS(120), 120},
86 {WM9713_ID2, 2, WM_READS(154), 154},
87 {WM9713_ID2, 3, WM_READS(188), 188},
88};
89
90
91static int sp_idx;
92
93
94
95
96static int cont_rate = 188;
97module_param(cont_rate, int, 0);
98MODULE_PARM_DESC(cont_rate, "Sampling rate in continuous mode (Hz)");
99
100
101
102
103
104
105
106static int pen_int = 1;
107module_param(pen_int, int, 0);
108MODULE_PARM_DESC(pen_int, "Pen down detection (1 = interrupt, 0 = polling)");
109
110
111
112
113
114
115static int pressure;
116module_param(pressure, int, 0);
117MODULE_PARM_DESC(pressure, "Pressure readback (1 = pressure, 0 = no pressure)");
118
119
120
121
122
123
124static int ac97_touch_slot = 5;
125module_param(ac97_touch_slot, int, 0);
126MODULE_PARM_DESC(ac97_touch_slot, "Touch screen data slot AC97 number");
127
128
129
130
131
132
133static int atmel_gpio_line = ATMEL_WM97XX_GPIO_DEFAULT;
134module_param(atmel_gpio_line, int, 0);
135MODULE_PARM_DESC(atmel_gpio_line, "GPIO line number connected to WM97xx");
136
137struct atmel_wm97xx {
138 struct wm97xx *wm;
139 struct timer_list pen_timer;
140 void __iomem *regs;
141 unsigned long ac97c_irq;
142 unsigned long gpio_pen;
143 unsigned long gpio_irq;
144 unsigned short x;
145 unsigned short y;
146};
147
148static irqreturn_t atmel_wm97xx_channel_b_interrupt(int irq, void *dev_id)
149{
150 struct atmel_wm97xx *atmel_wm97xx = dev_id;
151 struct wm97xx *wm = atmel_wm97xx->wm;
152 int status = ac97c_readl(atmel_wm97xx, CBSR);
153 irqreturn_t retval = IRQ_NONE;
154
155 if (status & AC97C_OVRUN) {
156 dev_dbg(&wm->touch_dev->dev, "AC97C overrun\n");
157 ac97c_readl(atmel_wm97xx, CBRHR);
158 retval = IRQ_HANDLED;
159 } else if (status & AC97C_RXRDY) {
160 u16 data;
161 u16 value;
162 u16 source;
163 u16 pen_down;
164
165 data = ac97c_readl(atmel_wm97xx, CBRHR);
166 value = data & 0x0fff;
167 source = data & WM97XX_ADCSEL_MASK;
168 pen_down = (data & WM97XX_PEN_DOWN) >> 8;
169
170 if (source == WM97XX_ADCSEL_X)
171 atmel_wm97xx->x = value;
172 if (source == WM97XX_ADCSEL_Y)
173 atmel_wm97xx->y = value;
174
175 if (!pressure && source == WM97XX_ADCSEL_Y) {
176 input_report_abs(wm->input_dev, ABS_X, atmel_wm97xx->x);
177 input_report_abs(wm->input_dev, ABS_Y, atmel_wm97xx->y);
178 input_report_key(wm->input_dev, BTN_TOUCH, pen_down);
179 input_sync(wm->input_dev);
180 } else if (pressure && source == WM97XX_ADCSEL_PRES) {
181 input_report_abs(wm->input_dev, ABS_X, atmel_wm97xx->x);
182 input_report_abs(wm->input_dev, ABS_Y, atmel_wm97xx->y);
183 input_report_abs(wm->input_dev, ABS_PRESSURE, value);
184 input_report_key(wm->input_dev, BTN_TOUCH, value);
185 input_sync(wm->input_dev);
186 }
187
188 retval = IRQ_HANDLED;
189 }
190
191 return retval;
192}
193
194static void atmel_wm97xx_acc_pen_up(struct wm97xx *wm)
195{
196 struct atmel_wm97xx *atmel_wm97xx = platform_get_drvdata(wm->touch_dev);
197 struct input_dev *input_dev = wm->input_dev;
198 int pen_down = gpio_get_value(atmel_wm97xx->gpio_pen);
199
200 if (pen_down != 0) {
201 mod_timer(&atmel_wm97xx->pen_timer,
202 jiffies + msecs_to_jiffies(1));
203 } else {
204 if (pressure)
205 input_report_abs(input_dev, ABS_PRESSURE, 0);
206 input_report_key(input_dev, BTN_TOUCH, 0);
207 input_sync(input_dev);
208 }
209}
210
211static void atmel_wm97xx_pen_timer(unsigned long data)
212{
213 atmel_wm97xx_acc_pen_up((struct wm97xx *)data);
214}
215
216static int atmel_wm97xx_acc_startup(struct wm97xx *wm)
217{
218 struct atmel_wm97xx *atmel_wm97xx = platform_get_drvdata(wm->touch_dev);
219 int idx = 0;
220
221 if (wm->ac97 == NULL)
222 return -ENODEV;
223
224 for (idx = 0; idx < ARRAY_SIZE(cinfo); idx++) {
225 if (wm->id != cinfo[idx].id)
226 continue;
227
228 sp_idx = idx;
229
230 if (cont_rate <= cinfo[idx].speed)
231 break;
232 }
233
234 wm->acc_rate = cinfo[sp_idx].code;
235 wm->acc_slot = ac97_touch_slot;
236 dev_info(&wm->touch_dev->dev, "atmel accelerated touchscreen driver, "
237 "%d samples/sec\n", cinfo[sp_idx].speed);
238
239 if (pen_int) {
240 unsigned long reg;
241
242 wm->pen_irq = atmel_wm97xx->gpio_irq;
243
244 switch (wm->id) {
245 case WM9712_ID2:
246 case WM9713_ID2:
247
248
249
250
251 wm97xx_config_gpio(wm, WM97XX_GPIO_13, WM97XX_GPIO_IN,
252 WM97XX_GPIO_POL_HIGH,
253 WM97XX_GPIO_STICKY,
254 WM97XX_GPIO_WAKE);
255 wm97xx_config_gpio(wm, WM97XX_GPIO_3, WM97XX_GPIO_OUT,
256 WM97XX_GPIO_POL_HIGH,
257 WM97XX_GPIO_NOTSTICKY,
258 WM97XX_GPIO_NOWAKE);
259 case WM9705_ID2:
260
261
262
263 reg = ac97c_readl(atmel_wm97xx, ICA);
264 reg &= ~AC97C_CH_MASK(wm->acc_slot);
265 reg |= AC97C_CH_ASSIGN(wm->acc_slot, B);
266 ac97c_writel(atmel_wm97xx, ICA, reg);
267
268
269
270
271 ac97c_writel(atmel_wm97xx, CBMR, AC97C_CMR_CENA
272 | AC97C_CMR_CEM_BIG
273 | AC97C_CMR_SIZE_16
274 | AC97C_OVRUN
275 | AC97C_RXRDY);
276
277 ac97c_readl(atmel_wm97xx, CBRHR);
278
279
280
281
282 ac97c_writel(atmel_wm97xx, IER, AC97C_INT_CBEVT);
283 break;
284 default:
285 dev_err(&wm->touch_dev->dev, "pen down irq not "
286 "supported on this device\n");
287 pen_int = 0;
288 break;
289 }
290 }
291
292 return 0;
293}
294
295static void atmel_wm97xx_acc_shutdown(struct wm97xx *wm)
296{
297 if (pen_int) {
298 struct atmel_wm97xx *atmel_wm97xx =
299 platform_get_drvdata(wm->touch_dev);
300 unsigned long ica;
301
302 switch (wm->id & 0xffff) {
303 case WM9705_ID2:
304 case WM9712_ID2:
305 case WM9713_ID2:
306
307 ica = ac97c_readl(atmel_wm97xx, ICA);
308 ica &= ~AC97C_CH_MASK(wm->acc_slot);
309 ac97c_writel(atmel_wm97xx, ICA, ica);
310 ac97c_writel(atmel_wm97xx, IDR, AC97C_INT_CBEVT);
311 ac97c_writel(atmel_wm97xx, CBMR, 0);
312 wm->pen_irq = 0;
313 break;
314 default:
315 dev_err(&wm->touch_dev->dev, "unknown codec\n");
316 break;
317 }
318 }
319}
320
321static void atmel_wm97xx_irq_enable(struct wm97xx *wm, int enable)
322{
323
324}
325
326static struct wm97xx_mach_ops atmel_mach_ops = {
327 .acc_enabled = 1,
328 .acc_pen_up = atmel_wm97xx_acc_pen_up,
329 .acc_startup = atmel_wm97xx_acc_startup,
330 .acc_shutdown = atmel_wm97xx_acc_shutdown,
331 .irq_enable = atmel_wm97xx_irq_enable,
332 .irq_gpio = WM97XX_GPIO_3,
333};
334
335static int __init atmel_wm97xx_probe(struct platform_device *pdev)
336{
337 struct wm97xx *wm = platform_get_drvdata(pdev);
338 struct atmel_wm97xx *atmel_wm97xx;
339 int ret;
340
341 atmel_wm97xx = kzalloc(sizeof(struct atmel_wm97xx), GFP_KERNEL);
342 if (!atmel_wm97xx) {
343 dev_dbg(&pdev->dev, "out of memory\n");
344 return -ENOMEM;
345 }
346
347 atmel_wm97xx->wm = wm;
348 atmel_wm97xx->regs = (void *)ATMEL_WM97XX_AC97C_IOMEM;
349 atmel_wm97xx->ac97c_irq = ATMEL_WM97XX_AC97C_IRQ;
350 atmel_wm97xx->gpio_pen = atmel_gpio_line;
351 atmel_wm97xx->gpio_irq = gpio_to_irq(atmel_wm97xx->gpio_pen);
352
353 setup_timer(&atmel_wm97xx->pen_timer, atmel_wm97xx_pen_timer,
354 (unsigned long)wm);
355
356 ret = request_irq(atmel_wm97xx->ac97c_irq,
357 atmel_wm97xx_channel_b_interrupt,
358 IRQF_SHARED, "atmel-wm97xx-ch-b", atmel_wm97xx);
359 if (ret) {
360 dev_dbg(&pdev->dev, "could not request ac97c irq\n");
361 goto err;
362 }
363
364 platform_set_drvdata(pdev, atmel_wm97xx);
365
366 ret = wm97xx_register_mach_ops(wm, &atmel_mach_ops);
367 if (ret)
368 goto err_irq;
369
370 return ret;
371
372err_irq:
373 free_irq(atmel_wm97xx->ac97c_irq, atmel_wm97xx);
374err:
375 kfree(atmel_wm97xx);
376 return ret;
377}
378
379static 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 kfree(atmel_wm97xx);
389
390 return 0;
391}
392
393#ifdef CONFIG_PM_SLEEP
394static int atmel_wm97xx_suspend(struct *dev)
395{
396 struct platform_device *pdev = to_platform_device(dev);
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
406static int atmel_wm97xx_resume(struct device *dev)
407{
408 struct platform_device *pdev = to_platform_device(dev);
409 struct atmel_wm97xx *atmel_wm97xx = platform_get_drvdata(pdev);
410 struct wm97xx *wm = atmel_wm97xx->wm;
411
412 if (wm->input_dev->users) {
413 enable_irq(atmel_wm97xx->gpio_irq);
414 ac97c_writel(atmel_wm97xx, IER, AC97C_INT_CBEVT);
415 }
416
417 return 0;
418}
419#endif
420
421static SIMPLE_DEV_PM_OPS(atmel_wm97xx_pm_ops,
422 atmel_wm97xx_suspend, atmel_wm97xx_resume);
423
424static struct platform_driver atmel_wm97xx_driver = {
425 .remove = __exit_p(atmel_wm97xx_remove),
426 .driver = {
427 .name = "wm97xx-touch",
428 .owner = THIS_MODULE,
429 .pm = &atmel_wm97xx_pm_ops,
430 },
431};
432
433module_platform_driver_probe(atmel_wm97xx_driver, atmel_wm97xx_probe);
434
435MODULE_AUTHOR("Hans-Christian Egtvedt <egtvedt@samfundet.no>");
436MODULE_DESCRIPTION("wm97xx continuous touch driver for Atmel AT91 and AVR32");
437MODULE_LICENSE("GPL");
438
