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12#include <linux/platform_device.h>
13#include <linux/interrupt.h>
14#include <linux/spinlock.h>
15#include <linux/io.h>
16#include <linux/delay.h>
17#include <linux/input.h>
18#include <linux/slab.h>
19#include <linux/clk.h>
20#include <linux/module.h>
21
22#include <linux/platform_data/keypad-nomadik-ske.h>
23
24
25#define SKE_KPMLT (0x1 << 6)
26#define SKE_KPCN (0x7 << 3)
27#define SKE_KPASEN (0x1 << 2)
28#define SKE_KPASON (0x1 << 7)
29
30
31#define SKE_KPIMA (0x1 << 2)
32
33
34#define SKE_KPICS (0x1 << 3)
35#define SKE_KPICA (0x1 << 2)
36
37
38#define SKE_KPRISA (0x1 << 2)
39
40#define SKE_KEYPAD_ROW_SHIFT 3
41#define SKE_KPD_NUM_ROWS 8
42#define SKE_KPD_NUM_COLS 8
43
44
45#define SKE_ASR0 0x20
46#define SKE_ASR1 0x24
47#define SKE_ASR2 0x28
48#define SKE_ASR3 0x2C
49
50#define SKE_NUM_ASRX_REGISTERS (4)
51#define KEY_PRESSED_DELAY 10
52
53
54
55
56
57
58
59
60
61
62
63
64struct ske_keypad {
65 int irq;
66 void __iomem *reg_base;
67 struct input_dev *input;
68 const struct ske_keypad_platform_data *board;
69 unsigned short keymap[SKE_KPD_NUM_ROWS * SKE_KPD_NUM_COLS];
70 struct clk *clk;
71 struct clk *pclk;
72 spinlock_t ske_keypad_lock;
73};
74
75static void ske_keypad_set_bits(struct ske_keypad *keypad, u16 addr,
76 u8 mask, u8 data)
77{
78 u32 ret;
79
80 spin_lock(&keypad->ske_keypad_lock);
81
82 ret = readl(keypad->reg_base + addr);
83 ret &= ~mask;
84 ret |= data;
85 writel(ret, keypad->reg_base + addr);
86
87 spin_unlock(&keypad->ske_keypad_lock);
88}
89
90
91
92
93
94
95static int __init ske_keypad_chip_init(struct ske_keypad *keypad)
96{
97 u32 value;
98 int timeout = keypad->board->debounce_ms;
99
100
101 while ((readl(keypad->reg_base + SKE_RIS) != 0x00000000) && timeout--)
102 cpu_relax();
103
104 if (timeout == -1)
105 return -EINVAL;
106
107
108
109
110
111
112 spin_lock(&keypad->ske_keypad_lock);
113 value = readl(keypad->reg_base + SKE_DBCR);
114 value = value & 0xff;
115 value |= ((keypad->board->debounce_ms * 32000)/32768) << 8;
116 writel(value, keypad->reg_base + SKE_DBCR);
117 spin_unlock(&keypad->ske_keypad_lock);
118
119
120 ske_keypad_set_bits(keypad, SKE_CR, 0x0, SKE_KPMLT);
121
122
123
124
125
126 value = (keypad->board->kcol - 1) << 3;
127 ske_keypad_set_bits(keypad, SKE_CR, SKE_KPCN, value);
128
129
130 ske_keypad_set_bits(keypad, SKE_ICR, 0x0, SKE_KPICA | SKE_KPICS);
131
132
133 ske_keypad_set_bits(keypad, SKE_IMSC, 0x0, SKE_KPIMA);
134
135
136 ske_keypad_set_bits(keypad, SKE_CR, 0x0, SKE_KPASEN);
137
138 return 0;
139}
140
141static void ske_keypad_report(struct ske_keypad *keypad, u8 status, int col)
142{
143 int row = 0, code, pos;
144 struct input_dev *input = keypad->input;
145 u32 ske_ris;
146 int key_pressed;
147 int num_of_rows;
148
149
150 num_of_rows = hweight8(status);
151 do {
152 pos = __ffs(status);
153 row = pos;
154 status &= ~(1 << pos);
155
156 code = MATRIX_SCAN_CODE(row, col, SKE_KEYPAD_ROW_SHIFT);
157 ske_ris = readl(keypad->reg_base + SKE_RIS);
158 key_pressed = ske_ris & SKE_KPRISA;
159
160 input_event(input, EV_MSC, MSC_SCAN, code);
161 input_report_key(input, keypad->keymap[code], key_pressed);
162 input_sync(input);
163 num_of_rows--;
164 } while (num_of_rows);
165}
166
167static void ske_keypad_read_data(struct ske_keypad *keypad)
168{
169 u8 status;
170 int col = 0;
171 int ske_asr, i;
172
173
174
175
176
177
178
179
180 for (i = 0; i < SKE_NUM_ASRX_REGISTERS; i++) {
181 ske_asr = readl(keypad->reg_base + SKE_ASR0 + (4 * i));
182 if (!ske_asr)
183 continue;
184
185
186 status = ske_asr & 0xff;
187 if (status) {
188 col = i * 2;
189 ske_keypad_report(keypad, status, col);
190 }
191 status = (ske_asr & 0xff00) >> 8;
192 if (status) {
193 col = (i * 2) + 1;
194 ske_keypad_report(keypad, status, col);
195 }
196 }
197}
198
199static irqreturn_t ske_keypad_irq(int irq, void *dev_id)
200{
201 struct ske_keypad *keypad = dev_id;
202 int timeout = keypad->board->debounce_ms;
203
204
205 ske_keypad_set_bits(keypad, SKE_IMSC, ~SKE_KPIMA, 0x0);
206 ske_keypad_set_bits(keypad, SKE_ICR, 0x0, SKE_KPICA);
207
208 while ((readl(keypad->reg_base + SKE_CR) & SKE_KPASON) && --timeout)
209 cpu_relax();
210
211
212 ske_keypad_read_data(keypad);
213
214
215 while ((readl(keypad->reg_base + SKE_RIS)) && --timeout)
216 msleep(KEY_PRESSED_DELAY);
217
218
219 ske_keypad_set_bits(keypad, SKE_IMSC, 0x0, SKE_KPIMA);
220
221 return IRQ_HANDLED;
222}
223
224static int __init ske_keypad_probe(struct platform_device *pdev)
225{
226 const struct ske_keypad_platform_data *plat =
227 dev_get_platdata(&pdev->dev);
228 struct ske_keypad *keypad;
229 struct input_dev *input;
230 struct resource *res;
231 int irq;
232 int error;
233
234 if (!plat) {
235 dev_err(&pdev->dev, "invalid keypad platform data\n");
236 return -EINVAL;
237 }
238
239 irq = platform_get_irq(pdev, 0);
240 if (irq < 0)
241 return -EINVAL;
242
243 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
244 if (!res) {
245 dev_err(&pdev->dev, "missing platform resources\n");
246 return -EINVAL;
247 }
248
249 keypad = kzalloc(sizeof(struct ske_keypad), GFP_KERNEL);
250 input = input_allocate_device();
251 if (!keypad || !input) {
252 dev_err(&pdev->dev, "failed to allocate keypad memory\n");
253 error = -ENOMEM;
254 goto err_free_mem;
255 }
256
257 keypad->irq = irq;
258 keypad->board = plat;
259 keypad->input = input;
260 spin_lock_init(&keypad->ske_keypad_lock);
261
262 if (!request_mem_region(res->start, resource_size(res), pdev->name)) {
263 dev_err(&pdev->dev, "failed to request I/O memory\n");
264 error = -EBUSY;
265 goto err_free_mem;
266 }
267
268 keypad->reg_base = ioremap(res->start, resource_size(res));
269 if (!keypad->reg_base) {
270 dev_err(&pdev->dev, "failed to remap I/O memory\n");
271 error = -ENXIO;
272 goto err_free_mem_region;
273 }
274
275 keypad->pclk = clk_get(&pdev->dev, "apb_pclk");
276 if (IS_ERR(keypad->pclk)) {
277 dev_err(&pdev->dev, "failed to get pclk\n");
278 error = PTR_ERR(keypad->pclk);
279 goto err_iounmap;
280 }
281
282 keypad->clk = clk_get(&pdev->dev, NULL);
283 if (IS_ERR(keypad->clk)) {
284 dev_err(&pdev->dev, "failed to get clk\n");
285 error = PTR_ERR(keypad->clk);
286 goto err_pclk;
287 }
288
289 input->id.bustype = BUS_HOST;
290 input->name = "ux500-ske-keypad";
291 input->dev.parent = &pdev->dev;
292
293 error = matrix_keypad_build_keymap(plat->keymap_data, NULL,
294 SKE_KPD_NUM_ROWS, SKE_KPD_NUM_COLS,
295 keypad->keymap, input);
296 if (error) {
297 dev_err(&pdev->dev, "Failed to build keymap\n");
298 goto err_clk;
299 }
300
301 input_set_capability(input, EV_MSC, MSC_SCAN);
302 if (!plat->no_autorepeat)
303 __set_bit(EV_REP, input->evbit);
304
305 error = clk_prepare_enable(keypad->pclk);
306 if (error) {
307 dev_err(&pdev->dev, "Failed to prepare/enable pclk\n");
308 goto err_clk;
309 }
310
311 error = clk_prepare_enable(keypad->clk);
312 if (error) {
313 dev_err(&pdev->dev, "Failed to prepare/enable clk\n");
314 goto err_pclk_disable;
315 }
316
317
318
319 if (keypad->board->init)
320 keypad->board->init();
321
322 error = ske_keypad_chip_init(keypad);
323 if (error) {
324 dev_err(&pdev->dev, "unable to init keypad hardware\n");
325 goto err_clk_disable;
326 }
327
328 error = request_threaded_irq(keypad->irq, NULL, ske_keypad_irq,
329 IRQF_ONESHOT, "ske-keypad", keypad);
330 if (error) {
331 dev_err(&pdev->dev, "allocate irq %d failed\n", keypad->irq);
332 goto err_clk_disable;
333 }
334
335 error = input_register_device(input);
336 if (error) {
337 dev_err(&pdev->dev,
338 "unable to register input device: %d\n", error);
339 goto err_free_irq;
340 }
341
342 if (plat->wakeup_enable)
343 device_init_wakeup(&pdev->dev, true);
344
345 platform_set_drvdata(pdev, keypad);
346
347 return 0;
348
349err_free_irq:
350 free_irq(keypad->irq, keypad);
351err_clk_disable:
352 clk_disable_unprepare(keypad->clk);
353err_pclk_disable:
354 clk_disable_unprepare(keypad->pclk);
355err_clk:
356 clk_put(keypad->clk);
357err_pclk:
358 clk_put(keypad->pclk);
359err_iounmap:
360 iounmap(keypad->reg_base);
361err_free_mem_region:
362 release_mem_region(res->start, resource_size(res));
363err_free_mem:
364 input_free_device(input);
365 kfree(keypad);
366 return error;
367}
368
369static int ske_keypad_remove(struct platform_device *pdev)
370{
371 struct ske_keypad *keypad = platform_get_drvdata(pdev);
372 struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
373
374 free_irq(keypad->irq, keypad);
375
376 input_unregister_device(keypad->input);
377
378 clk_disable_unprepare(keypad->clk);
379 clk_put(keypad->clk);
380
381 if (keypad->board->exit)
382 keypad->board->exit();
383
384 iounmap(keypad->reg_base);
385 release_mem_region(res->start, resource_size(res));
386 kfree(keypad);
387
388 return 0;
389}
390
391#ifdef CONFIG_PM_SLEEP
392static int ske_keypad_suspend(struct device *dev)
393{
394 struct platform_device *pdev = to_platform_device(dev);
395 struct ske_keypad *keypad = platform_get_drvdata(pdev);
396 int irq = platform_get_irq(pdev, 0);
397
398 if (device_may_wakeup(dev))
399 enable_irq_wake(irq);
400 else
401 ske_keypad_set_bits(keypad, SKE_IMSC, ~SKE_KPIMA, 0x0);
402
403 return 0;
404}
405
406static int ske_keypad_resume(struct device *dev)
407{
408 struct platform_device *pdev = to_platform_device(dev);
409 struct ske_keypad *keypad = platform_get_drvdata(pdev);
410 int irq = platform_get_irq(pdev, 0);
411
412 if (device_may_wakeup(dev))
413 disable_irq_wake(irq);
414 else
415 ske_keypad_set_bits(keypad, SKE_IMSC, 0x0, SKE_KPIMA);
416
417 return 0;
418}
419#endif
420
421static SIMPLE_DEV_PM_OPS(ske_keypad_dev_pm_ops,
422 ske_keypad_suspend, ske_keypad_resume);
423
424static struct platform_driver ske_keypad_driver = {
425 .driver = {
426 .name = "nmk-ske-keypad",
427 .pm = &ske_keypad_dev_pm_ops,
428 },
429 .remove = ske_keypad_remove,
430};
431
432module_platform_driver_probe(ske_keypad_driver, ske_keypad_probe);
433
434MODULE_LICENSE("GPL v2");
435MODULE_AUTHOR("Naveen Kumar <naveen.gaddipati@stericsson.com> / Sundar Iyer <sundar.iyer@stericsson.com>");
436MODULE_DESCRIPTION("Nomadik Scroll-Key-Encoder Keypad Driver");
437MODULE_ALIAS("platform:nomadik-ske-keypad");
438
