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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
33#include <plat/omap4-keypad.h>
34
35
36#define OMAP4_KBD_REVISION 0x00
37#define OMAP4_KBD_SYSCONFIG 0x10
38#define OMAP4_KBD_SYSSTATUS 0x14
39#define OMAP4_KBD_IRQSTATUS 0x18
40#define OMAP4_KBD_IRQENABLE 0x1C
41#define OMAP4_KBD_WAKEUPENABLE 0x20
42#define OMAP4_KBD_PENDING 0x24
43#define OMAP4_KBD_CTRL 0x28
44#define OMAP4_KBD_DEBOUNCINGTIME 0x2C
45#define OMAP4_KBD_LONGKEYTIME 0x30
46#define OMAP4_KBD_TIMEOUT 0x34
47#define OMAP4_KBD_STATEMACHINE 0x38
48#define OMAP4_KBD_ROWINPUTS 0x3C
49#define OMAP4_KBD_COLUMNOUTPUTS 0x40
50#define OMAP4_KBD_FULLCODE31_0 0x44
51#define OMAP4_KBD_FULLCODE63_32 0x48
52
53
54#define OMAP4_DEF_IRQENABLE_EVENTEN (1 << 0)
55#define OMAP4_DEF_IRQENABLE_LONGKEY (1 << 1)
56#define OMAP4_DEF_IRQENABLE_TIMEOUTEN (1 << 2)
57#define OMAP4_DEF_WUP_EVENT_ENA (1 << 0)
58#define OMAP4_DEF_WUP_LONG_KEY_ENA (1 << 1)
59#define OMAP4_DEF_CTRL_NOSOFTMODE (1 << 1)
60#define OMAP4_DEF_CTRLPTVVALUE (1 << 2)
61#define OMAP4_DEF_CTRLPTV (1 << 1)
62
63
64#define OMAP4_VAL_IRQDISABLE 0x00
65#define OMAP4_VAL_DEBOUNCINGTIME 0x07
66#define OMAP4_VAL_FUNCTIONALCFG 0x1E
67
68#define OMAP4_MASK_IRQSTATUSDISABLE 0xFFFF
69
70struct omap4_keypad {
71 struct input_dev *input;
72
73 void __iomem *base;
74 int irq;
75
76 unsigned int rows;
77 unsigned int cols;
78 unsigned int row_shift;
79 unsigned char key_state[8];
80 unsigned short keymap[];
81};
82
83static void __devinit omap4_keypad_config(struct omap4_keypad *keypad_data)
84{
85 __raw_writel(OMAP4_VAL_FUNCTIONALCFG,
86 keypad_data->base + OMAP4_KBD_CTRL);
87 __raw_writel(OMAP4_VAL_DEBOUNCINGTIME,
88 keypad_data->base + OMAP4_KBD_DEBOUNCINGTIME);
89 __raw_writel(OMAP4_VAL_IRQDISABLE,
90 keypad_data->base + OMAP4_KBD_IRQSTATUS);
91 __raw_writel(OMAP4_DEF_IRQENABLE_EVENTEN | OMAP4_DEF_IRQENABLE_LONGKEY,
92 keypad_data->base + OMAP4_KBD_IRQENABLE);
93 __raw_writel(OMAP4_DEF_WUP_EVENT_ENA | OMAP4_DEF_WUP_LONG_KEY_ENA,
94 keypad_data->base + OMAP4_KBD_WAKEUPENABLE);
95}
96
97
98static irqreturn_t omap4_keypad_interrupt(int irq, void *dev_id)
99{
100 struct omap4_keypad *keypad_data = dev_id;
101 struct input_dev *input_dev = keypad_data->input;
102 unsigned char key_state[ARRAY_SIZE(keypad_data->key_state)];
103 unsigned int col, row, code, changed;
104 u32 *new_state = (u32 *) key_state;
105
106
107 __raw_writel(OMAP4_VAL_IRQDISABLE,
108 keypad_data->base + OMAP4_KBD_IRQENABLE);
109
110 *new_state = __raw_readl(keypad_data->base + OMAP4_KBD_FULLCODE31_0);
111 *(new_state + 1) = __raw_readl(keypad_data->base
112 + OMAP4_KBD_FULLCODE63_32);
113
114 for (row = 0; row < keypad_data->rows; row++) {
115 changed = key_state[row] ^ keypad_data->key_state[row];
116 if (!changed)
117 continue;
118
119 for (col = 0; col < keypad_data->cols; col++) {
120 if (changed & (1 << col)) {
121 code = MATRIX_SCAN_CODE(row, col,
122 keypad_data->row_shift);
123 input_event(input_dev, EV_MSC, MSC_SCAN, code);
124 input_report_key(input_dev,
125 keypad_data->keymap[code],
126 key_state[row] & (1 << col));
127 }
128 }
129 }
130
131 input_sync(input_dev);
132
133 memcpy(keypad_data->key_state, key_state,
134 sizeof(keypad_data->key_state));
135
136
137 __raw_writel(__raw_readl(keypad_data->base + OMAP4_KBD_IRQSTATUS),
138 keypad_data->base + OMAP4_KBD_IRQSTATUS);
139
140
141 __raw_writel(OMAP4_DEF_IRQENABLE_EVENTEN | OMAP4_DEF_IRQENABLE_LONGKEY,
142 keypad_data->base + OMAP4_KBD_IRQENABLE);
143
144 return IRQ_HANDLED;
145}
146
147static int __devinit omap4_keypad_probe(struct platform_device *pdev)
148{
149 const struct omap4_keypad_platform_data *pdata;
150 struct omap4_keypad *keypad_data;
151 struct input_dev *input_dev;
152 struct resource *res;
153 resource_size_t size;
154 unsigned int row_shift, max_keys;
155 int irq;
156 int error;
157
158
159 pdata = pdev->dev.platform_data;
160 if (!pdata) {
161 dev_err(&pdev->dev, "no platform data defined\n");
162 return -EINVAL;
163 }
164
165 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
166 if (!res) {
167 dev_err(&pdev->dev, "no base address specified\n");
168 return -EINVAL;
169 }
170
171 irq = platform_get_irq(pdev, 0);
172 if (!irq) {
173 dev_err(&pdev->dev, "no keyboard irq assigned\n");
174 return -EINVAL;
175 }
176
177 if (!pdata->keymap_data) {
178 dev_err(&pdev->dev, "no keymap data defined\n");
179 return -EINVAL;
180 }
181
182 row_shift = get_count_order(pdata->cols);
183 max_keys = pdata->rows << row_shift;
184
185 keypad_data = kzalloc(sizeof(struct omap4_keypad) +
186 max_keys * sizeof(keypad_data->keymap[0]),
187 GFP_KERNEL);
188 if (!keypad_data) {
189 dev_err(&pdev->dev, "keypad_data memory allocation failed\n");
190 return -ENOMEM;
191 }
192
193 size = resource_size(res);
194
195 res = request_mem_region(res->start, size, pdev->name);
196 if (!res) {
197 dev_err(&pdev->dev, "can't request mem region\n");
198 error = -EBUSY;
199 goto err_free_keypad;
200 }
201
202 keypad_data->base = ioremap(res->start, resource_size(res));
203 if (!keypad_data->base) {
204 dev_err(&pdev->dev, "can't ioremap mem resource\n");
205 error = -ENOMEM;
206 goto err_release_mem;
207 }
208
209 keypad_data->irq = irq;
210 keypad_data->row_shift = row_shift;
211 keypad_data->rows = pdata->rows;
212 keypad_data->cols = pdata->cols;
213
214
215 keypad_data->input = input_dev = input_allocate_device();
216 if (!input_dev) {
217 error = -ENOMEM;
218 goto err_unmap;
219 }
220
221 input_dev->name = pdev->name;
222 input_dev->dev.parent = &pdev->dev;
223 input_dev->id.bustype = BUS_HOST;
224 input_dev->id.vendor = 0x0001;
225 input_dev->id.product = 0x0001;
226 input_dev->id.version = 0x0001;
227
228 input_dev->keycode = keypad_data->keymap;
229 input_dev->keycodesize = sizeof(keypad_data->keymap[0]);
230 input_dev->keycodemax = max_keys;
231
232 __set_bit(EV_KEY, input_dev->evbit);
233 __set_bit(EV_REP, input_dev->evbit);
234
235 input_set_capability(input_dev, EV_MSC, MSC_SCAN);
236
237 input_set_drvdata(input_dev, keypad_data);
238
239 matrix_keypad_build_keymap(pdata->keymap_data, row_shift,
240 input_dev->keycode, input_dev->keybit);
241
242 omap4_keypad_config(keypad_data);
243
244 error = request_irq(keypad_data->irq, omap4_keypad_interrupt,
245 IRQF_TRIGGER_RISING,
246 "omap4-keypad", keypad_data);
247 if (error) {
248 dev_err(&pdev->dev, "failed to register interrupt\n");
249 goto err_free_input;
250 }
251
252 error = input_register_device(keypad_data->input);
253 if (error < 0) {
254 dev_err(&pdev->dev, "failed to register input device\n");
255 goto err_free_irq;
256 }
257
258
259 platform_set_drvdata(pdev, keypad_data);
260 return 0;
261
262err_free_irq:
263 free_irq(keypad_data->irq, keypad_data);
264err_free_input:
265 input_free_device(input_dev);
266err_unmap:
267 iounmap(keypad_data->base);
268err_release_mem:
269 release_mem_region(res->start, size);
270err_free_keypad:
271 kfree(keypad_data);
272 return error;
273}
274
275static int __devexit omap4_keypad_remove(struct platform_device *pdev)
276{
277 struct omap4_keypad *keypad_data = platform_get_drvdata(pdev);
278 struct resource *res;
279
280 free_irq(keypad_data->irq, keypad_data);
281 input_unregister_device(keypad_data->input);
282
283 iounmap(keypad_data->base);
284
285 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
286 release_mem_region(res->start, resource_size(res));
287
288 kfree(keypad_data);
289 platform_set_drvdata(pdev, NULL);
290
291 return 0;
292}
293
294static struct platform_driver omap4_keypad_driver = {
295 .probe = omap4_keypad_probe,
296 .remove = __devexit_p(omap4_keypad_remove),
297 .driver = {
298 .name = "omap4-keypad",
299 .owner = THIS_MODULE,
300 },
301};
302
303static int __init omap4_keypad_init(void)
304{
305 return platform_driver_register(&omap4_keypad_driver);
306}
307module_init(omap4_keypad_init);
308
309static void __exit omap4_keypad_exit(void)
310{
311 platform_driver_unregister(&omap4_keypad_driver);
312}
313module_exit(omap4_keypad_exit);
314
315MODULE_AUTHOR("Texas Instruments");
316MODULE_DESCRIPTION("OMAP4 Keypad Driver");
317MODULE_LICENSE("GPL");
318MODULE_ALIAS("platform:omap4-keypad");
319
