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