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1 /*
2  * OMAP4 Keypad Driver
3  *
4  * Copyright (C) 2010 Texas Instruments
5  *
6  * Author: Abraham Arce <x0066660@ti.com>
7  * Initial Code: Syed Rafiuddin <rafiuddin.syed@ti.com>
8  *
9  * This program is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License as published by
11  * the Free Software Foundation; either version 2 of the License, or
12  * (at your option) any later version.
13  *
14  * This program is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17  * GNU General Public License for more details.
18  *
19  * You should have received a copy of the GNU General Public License
20  * along with this program; if not, write to the Free Software
21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22  */
23
24 #include <linux/module.h>
25 #include <linux/init.h>
26 #include <linux/interrupt.h>
27 #include <linux/platform_device.h>
28 #include <linux/errno.h>
29 #include <linux/io.h>
30 #include <linux/input.h>
31 #include <linux/slab.h>
32 #include <linux/pm_runtime.h>
33
34 #include <linux/platform_data/omap4-keypad.h>
35
36 /* OMAP4 registers */
37 #define OMAP4_KBD_REVISION              0x00
38 #define OMAP4_KBD_SYSCONFIG             0x10
39 #define OMAP4_KBD_SYSSTATUS             0x14
40 #define OMAP4_KBD_IRQSTATUS             0x18
41 #define OMAP4_KBD_IRQENABLE             0x1C
42 #define OMAP4_KBD_WAKEUPENABLE          0x20
43 #define OMAP4_KBD_PENDING               0x24
44 #define OMAP4_KBD_CTRL                  0x28
45 #define OMAP4_KBD_DEBOUNCINGTIME        0x2C
46 #define OMAP4_KBD_LONGKEYTIME           0x30
47 #define OMAP4_KBD_TIMEOUT               0x34
48 #define OMAP4_KBD_STATEMACHINE          0x38
49 #define OMAP4_KBD_ROWINPUTS             0x3C
50 #define OMAP4_KBD_COLUMNOUTPUTS         0x40
51 #define OMAP4_KBD_FULLCODE31_0          0x44
52 #define OMAP4_KBD_FULLCODE63_32         0x48
53
54 /* OMAP4 bit definitions */
55 #define OMAP4_DEF_IRQENABLE_EVENTEN     (1 << 0)
56 #define OMAP4_DEF_IRQENABLE_LONGKEY     (1 << 1)
57 #define OMAP4_DEF_IRQENABLE_TIMEOUTEN   (1 << 2)
58 #define OMAP4_DEF_WUP_EVENT_ENA         (1 << 0)
59 #define OMAP4_DEF_WUP_LONG_KEY_ENA      (1 << 1)
60 #define OMAP4_DEF_CTRL_NOSOFTMODE       (1 << 1)
61 #define OMAP4_DEF_CTRLPTVVALUE          (1 << 2)
62 #define OMAP4_DEF_CTRLPTV               (1 << 1)
63
64 /* OMAP4 values */
65 #define OMAP4_VAL_IRQDISABLE            0x00
66 #define OMAP4_VAL_DEBOUNCINGTIME        0x07
67 #define OMAP4_VAL_FUNCTIONALCFG         0x1E
68
69 #define OMAP4_MASK_IRQSTATUSDISABLE     0xFFFF
70
71 struct omap4_keypad {
72         struct input_dev *input;
73
74         void __iomem *base;
75         int irq;
76
77         unsigned int rows;
78         unsigned int cols;
79         unsigned int row_shift;
80         unsigned char key_state[8];
81         unsigned short keymap[];
82 };
83
84 /* Interrupt handler */
85 static irqreturn_t omap4_keypad_interrupt(int irq, void *dev_id)
86 {
87         struct omap4_keypad *keypad_data = dev_id;
88         struct input_dev *input_dev = keypad_data->input;
89         unsigned char key_state[ARRAY_SIZE(keypad_data->key_state)];
90         unsigned int col, row, code, changed;
91         u32 *new_state = (u32 *) key_state;
92
93         /* Disable interrupts */
94         __raw_writel(OMAP4_VAL_IRQDISABLE,
95                      keypad_data->base + OMAP4_KBD_IRQENABLE);
96
97         *new_state = __raw_readl(keypad_data->base + OMAP4_KBD_FULLCODE31_0);
98         *(new_state + 1) = __raw_readl(keypad_data->base
99                                                 + OMAP4_KBD_FULLCODE63_32);
100
101         for (row = 0; row < keypad_data->rows; row++) {
102                 changed = key_state[row] ^ keypad_data->key_state[row];
103                 if (!changed)
104                         continue;
105
106                 for (col = 0; col < keypad_data->cols; col++) {
107                         if (changed & (1 << col)) {
108                                 code = MATRIX_SCAN_CODE(row, col,
109                                                 keypad_data->row_shift);
110                                 input_event(input_dev, EV_MSC, MSC_SCAN, code);
111                                 input_report_key(input_dev,
112                                                  keypad_data->keymap[code],
113                                                  key_state[row] & (1 << col));
114                         }
115                 }
116         }
117
118         input_sync(input_dev);
119
120         memcpy(keypad_data->key_state, key_state,
121                 sizeof(keypad_data->key_state));
122
123         /* clear pending interrupts */
124         __raw_writel(__raw_readl(keypad_data->base + OMAP4_KBD_IRQSTATUS),
125                         keypad_data->base + OMAP4_KBD_IRQSTATUS);
126
127         /* enable interrupts */
128         __raw_writel(OMAP4_DEF_IRQENABLE_EVENTEN | OMAP4_DEF_IRQENABLE_LONGKEY,
129                         keypad_data->base + OMAP4_KBD_IRQENABLE);
130
131         return IRQ_HANDLED;
132 }
133
134 static int omap4_keypad_open(struct input_dev *input)
135 {
136         struct omap4_keypad *keypad_data = input_get_drvdata(input);
137
138         pm_runtime_get_sync(input->dev.parent);
139
140         disable_irq(keypad_data->irq);
141
142         __raw_writel(OMAP4_VAL_FUNCTIONALCFG,
143                         keypad_data->base + OMAP4_KBD_CTRL);
144         __raw_writel(OMAP4_VAL_DEBOUNCINGTIME,
145                         keypad_data->base + OMAP4_KBD_DEBOUNCINGTIME);
146         __raw_writel(OMAP4_VAL_IRQDISABLE,
147                         keypad_data->base + OMAP4_KBD_IRQSTATUS);
148         __raw_writel(OMAP4_DEF_IRQENABLE_EVENTEN | OMAP4_DEF_IRQENABLE_LONGKEY,
149                         keypad_data->base + OMAP4_KBD_IRQENABLE);
150         __raw_writel(OMAP4_DEF_WUP_EVENT_ENA | OMAP4_DEF_WUP_LONG_KEY_ENA,
151                         keypad_data->base + OMAP4_KBD_WAKEUPENABLE);
152
153         enable_irq(keypad_data->irq);
154
155         return 0;
156 }
157
158 static void omap4_keypad_close(struct input_dev *input)
159 {
160         struct omap4_keypad *keypad_data = input_get_drvdata(input);
161
162         disable_irq(keypad_data->irq);
163
164         /* Disable interrupts */
165         __raw_writel(OMAP4_VAL_IRQDISABLE,
166                      keypad_data->base + OMAP4_KBD_IRQENABLE);
167
168         /* clear pending interrupts */
169         __raw_writel(__raw_readl(keypad_data->base + OMAP4_KBD_IRQSTATUS),
170                         keypad_data->base + OMAP4_KBD_IRQSTATUS);
171
172         enable_irq(keypad_data->irq);
173
174         pm_runtime_put_sync(input->dev.parent);
175 }
176
177 static int __devinit omap4_keypad_probe(struct platform_device *pdev)
178 {
179         const struct omap4_keypad_platform_data *pdata;
180         struct omap4_keypad *keypad_data;
181         struct input_dev *input_dev;
182         struct resource *res;
183         resource_size_t size;
184         unsigned int row_shift, max_keys;
185         int irq;
186         int error;
187
188         /* platform data */
189         pdata = pdev->dev.platform_data;
190         if (!pdata) {
191                 dev_err(&pdev->dev, "no platform data defined\n");
192                 return -EINVAL;
193         }
194
195         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
196         if (!res) {
197                 dev_err(&pdev->dev, "no base address specified\n");
198                 return -EINVAL;
199         }
200
201         irq = platform_get_irq(pdev, 0);
202         if (!irq) {
203                 dev_err(&pdev->dev, "no keyboard irq assigned\n");
204                 return -EINVAL;
205         }
206
207         if (!pdata->keymap_data) {
208                 dev_err(&pdev->dev, "no keymap data defined\n");
209                 return -EINVAL;
210         }
211
212         row_shift = get_count_order(pdata->cols);
213         max_keys = pdata->rows << row_shift;
214
215         keypad_data = kzalloc(sizeof(struct omap4_keypad) +
216                                 max_keys * sizeof(keypad_data->keymap[0]),
217                               GFP_KERNEL);
218         if (!keypad_data) {
219                 dev_err(&pdev->dev, "keypad_data memory allocation failed\n");
220                 return -ENOMEM;
221         }
222
223         size = resource_size(res);
224
225         res = request_mem_region(res->start, size, pdev->name);
226         if (!res) {
227                 dev_err(&pdev->dev, "can't request mem region\n");
228                 error = -EBUSY;
229                 goto err_free_keypad;
230         }
231
232         keypad_data->base = ioremap(res->start, resource_size(res));
233         if (!keypad_data->base) {
234                 dev_err(&pdev->dev, "can't ioremap mem resource\n");
235                 error = -ENOMEM;
236                 goto err_release_mem;
237         }
238
239         keypad_data->irq = irq;
240         keypad_data->row_shift = row_shift;
241         keypad_data->rows = pdata->rows;
242         keypad_data->cols = pdata->cols;
243
244         /* input device allocation */
245         keypad_data->input = input_dev = input_allocate_device();
246         if (!input_dev) {
247                 error = -ENOMEM;
248                 goto err_unmap;
249         }
250
251         input_dev->name = pdev->name;
252         input_dev->dev.parent = &pdev->dev;
253         input_dev->id.bustype = BUS_HOST;
254         input_dev->id.vendor = 0x0001;
255         input_dev->id.product = 0x0001;
256         input_dev->id.version = 0x0001;
257
258         input_dev->open = omap4_keypad_open;
259         input_dev->close = omap4_keypad_close;
260
261         input_dev->keycode      = keypad_data->keymap;
262         input_dev->keycodesize  = sizeof(keypad_data->keymap[0]);
263         input_dev->keycodemax   = max_keys;
264
265         __set_bit(EV_KEY, input_dev->evbit);
266         __set_bit(EV_REP, input_dev->evbit);
267
268         input_set_capability(input_dev, EV_MSC, MSC_SCAN);
269
270         input_set_drvdata(input_dev, keypad_data);
271
272         matrix_keypad_build_keymap(pdata->keymap_data, row_shift,
273                         input_dev->keycode, input_dev->keybit);
274
275         error = request_irq(keypad_data->irq, omap4_keypad_interrupt,
276                              IRQF_TRIGGER_RISING,
277                              "omap4-keypad", keypad_data);
278         if (error) {
279                 dev_err(&pdev->dev, "failed to register interrupt\n");
280                 goto err_free_input;
281         }
282
283         pm_runtime_enable(&pdev->dev);
284
285         error = input_register_device(keypad_data->input);
286         if (error < 0) {
287                 dev_err(&pdev->dev, "failed to register input device\n");
288                 goto err_pm_disable;
289         }
290
291         platform_set_drvdata(pdev, keypad_data);
292         return 0;
293
294 err_pm_disable:
295         pm_runtime_disable(&pdev->dev);
296         free_irq(keypad_data->irq, keypad_data);
297 err_free_input:
298         input_free_device(input_dev);
299 err_unmap:
300         iounmap(keypad_data->base);
301 err_release_mem:
302         release_mem_region(res->start, size);
303 err_free_keypad:
304         kfree(keypad_data);
305         return error;
306 }
307
308 static int __devexit omap4_keypad_remove(struct platform_device *pdev)
309 {
310         struct omap4_keypad *keypad_data = platform_get_drvdata(pdev);
311         struct resource *res;
312
313         free_irq(keypad_data->irq, keypad_data);
314
315         pm_runtime_disable(&pdev->dev);
316
317         input_unregister_device(keypad_data->input);
318
319         iounmap(keypad_data->base);
320
321         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
322         release_mem_region(res->start, resource_size(res));
323
324         kfree(keypad_data);
325         platform_set_drvdata(pdev, NULL);
326
327         return 0;
328 }
329
330 static struct platform_driver omap4_keypad_driver = {
331         .probe          = omap4_keypad_probe,
332         .remove         = __devexit_p(omap4_keypad_remove),
333         .driver         = {
334                 .name   = "omap4-keypad",
335                 .owner  = THIS_MODULE,
336         },
337 };
338 module_platform_driver(omap4_keypad_driver);
339
340 MODULE_AUTHOR("Texas Instruments");
341 MODULE_DESCRIPTION("OMAP4 Keypad Driver");
342 MODULE_LICENSE("GPL");
343 MODULE_ALIAS("platform:omap4-keypad");