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14#include <linux/module.h>
15#include <linux/interrupt.h>
16#include <linux/types.h>
17#include <linux/input.h>
18#include <linux/kernel.h>
19#include <linux/delay.h>
20#include <linux/platform_device.h>
21#include <linux/mutex.h>
22#include <linux/errno.h>
23#include <linux/slab.h>
24#include <linux/gpio.h>
25#include <linux/platform_data/gpio-omap.h>
26#include <linux/platform_data/keypad-omap.h>
27
28#undef NEW_BOARD_LEARNING_MODE
29
30static void omap_kp_tasklet(unsigned long);
31static void omap_kp_timer(struct timer_list *);
32
33static unsigned char keypad_state[8];
34static DEFINE_MUTEX(kp_enable_mutex);
35static int kp_enable = 1;
36static int kp_cur_group = -1;
37
38struct omap_kp {
39 struct input_dev *input;
40 struct timer_list timer;
41 int irq;
42 unsigned int rows;
43 unsigned int cols;
44 unsigned long delay;
45 unsigned int debounce;
46 unsigned short keymap[];
47};
48
49static DECLARE_TASKLET_DISABLED_OLD(kp_tasklet, omap_kp_tasklet);
50
51static unsigned int *row_gpios;
52static unsigned int *col_gpios;
53
54static irqreturn_t omap_kp_interrupt(int irq, void *dev_id)
55{
56
57 omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
58
59 tasklet_schedule(&kp_tasklet);
60
61 return IRQ_HANDLED;
62}
63
64static void omap_kp_timer(struct timer_list *unused)
65{
66 tasklet_schedule(&kp_tasklet);
67}
68
69static void omap_kp_scan_keypad(struct omap_kp *omap_kp, unsigned char *state)
70{
71 int col = 0;
72
73
74 omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
75
76
77 omap_writew(0xff, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBC);
78 for (col = 0; col < omap_kp->cols; col++) {
79 omap_writew(~(1 << col) & 0xff,
80 OMAP1_MPUIO_BASE + OMAP_MPUIO_KBC);
81
82 udelay(omap_kp->delay);
83
84 state[col] = ~omap_readw(OMAP1_MPUIO_BASE +
85 OMAP_MPUIO_KBR_LATCH) & 0xff;
86 }
87 omap_writew(0x00, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBC);
88 udelay(2);
89}
90
91static void omap_kp_tasklet(unsigned long data)
92{
93 struct omap_kp *omap_kp_data = (struct omap_kp *) data;
94 unsigned short *keycodes = omap_kp_data->input->keycode;
95 unsigned int row_shift = get_count_order(omap_kp_data->cols);
96 unsigned char new_state[8], changed, key_down = 0;
97 int col, row;
98
99
100 omap_kp_scan_keypad(omap_kp_data, new_state);
101
102
103 for (col = 0; col < omap_kp_data->cols; col++) {
104 changed = new_state[col] ^ keypad_state[col];
105 key_down |= new_state[col];
106 if (changed == 0)
107 continue;
108
109 for (row = 0; row < omap_kp_data->rows; row++) {
110 int key;
111 if (!(changed & (1 << row)))
112 continue;
113#ifdef NEW_BOARD_LEARNING_MODE
114 printk(KERN_INFO "omap-keypad: key %d-%d %s\n", col,
115 row, (new_state[col] & (1 << row)) ?
116 "pressed" : "released");
117#else
118 key = keycodes[MATRIX_SCAN_CODE(row, col, row_shift)];
119
120 if (!(kp_cur_group == (key & GROUP_MASK) ||
121 kp_cur_group == -1))
122 continue;
123
124 kp_cur_group = key & GROUP_MASK;
125 input_report_key(omap_kp_data->input, key & ~GROUP_MASK,
126 new_state[col] & (1 << row));
127#endif
128 }
129 }
130 input_sync(omap_kp_data->input);
131 memcpy(keypad_state, new_state, sizeof(keypad_state));
132
133 if (key_down) {
134
135
136 mod_timer(&omap_kp_data->timer, jiffies + HZ / 20);
137 } else {
138
139 omap_writew(0, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
140 kp_cur_group = -1;
141 }
142}
143
144static ssize_t omap_kp_enable_show(struct device *dev,
145 struct device_attribute *attr, char *buf)
146{
147 return sprintf(buf, "%u\n", kp_enable);
148}
149
150static ssize_t omap_kp_enable_store(struct device *dev, struct device_attribute *attr,
151 const char *buf, size_t count)
152{
153 struct omap_kp *omap_kp = dev_get_drvdata(dev);
154 int state;
155
156 if (sscanf(buf, "%u", &state) != 1)
157 return -EINVAL;
158
159 if ((state != 1) && (state != 0))
160 return -EINVAL;
161
162 mutex_lock(&kp_enable_mutex);
163 if (state != kp_enable) {
164 if (state)
165 enable_irq(omap_kp->irq);
166 else
167 disable_irq(omap_kp->irq);
168 kp_enable = state;
169 }
170 mutex_unlock(&kp_enable_mutex);
171
172 return strnlen(buf, count);
173}
174
175static DEVICE_ATTR(enable, S_IRUGO | S_IWUSR, omap_kp_enable_show, omap_kp_enable_store);
176
177static int omap_kp_probe(struct platform_device *pdev)
178{
179 struct omap_kp *omap_kp;
180 struct input_dev *input_dev;
181 struct omap_kp_platform_data *pdata = dev_get_platdata(&pdev->dev);
182 int i, col_idx, row_idx, ret;
183 unsigned int row_shift, keycodemax;
184
185 if (!pdata->rows || !pdata->cols || !pdata->keymap_data) {
186 printk(KERN_ERR "No rows, cols or keymap_data from pdata\n");
187 return -EINVAL;
188 }
189
190 row_shift = get_count_order(pdata->cols);
191 keycodemax = pdata->rows << row_shift;
192
193 omap_kp = kzalloc(sizeof(struct omap_kp) +
194 keycodemax * sizeof(unsigned short), GFP_KERNEL);
195 input_dev = input_allocate_device();
196 if (!omap_kp || !input_dev) {
197 kfree(omap_kp);
198 input_free_device(input_dev);
199 return -ENOMEM;
200 }
201
202 platform_set_drvdata(pdev, omap_kp);
203
204 omap_kp->input = input_dev;
205
206
207 omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
208
209 if (pdata->delay)
210 omap_kp->delay = pdata->delay;
211
212 if (pdata->row_gpios && pdata->col_gpios) {
213 row_gpios = pdata->row_gpios;
214 col_gpios = pdata->col_gpios;
215 }
216
217 omap_kp->rows = pdata->rows;
218 omap_kp->cols = pdata->cols;
219
220 col_idx = 0;
221 row_idx = 0;
222
223 timer_setup(&omap_kp->timer, omap_kp_timer, 0);
224
225
226 kp_tasklet.data = (unsigned long) omap_kp;
227 tasklet_enable(&kp_tasklet);
228
229 ret = device_create_file(&pdev->dev, &dev_attr_enable);
230 if (ret < 0)
231 goto err2;
232
233
234 input_dev->name = "omap-keypad";
235 input_dev->phys = "omap-keypad/input0";
236 input_dev->dev.parent = &pdev->dev;
237
238 input_dev->id.bustype = BUS_HOST;
239 input_dev->id.vendor = 0x0001;
240 input_dev->id.product = 0x0001;
241 input_dev->id.version = 0x0100;
242
243 if (pdata->rep)
244 __set_bit(EV_REP, input_dev->evbit);
245
246 ret = matrix_keypad_build_keymap(pdata->keymap_data, NULL,
247 pdata->rows, pdata->cols,
248 omap_kp->keymap, input_dev);
249 if (ret < 0)
250 goto err3;
251
252 ret = input_register_device(omap_kp->input);
253 if (ret < 0) {
254 printk(KERN_ERR "Unable to register omap-keypad input device\n");
255 goto err3;
256 }
257
258 if (pdata->dbounce)
259 omap_writew(0xff, OMAP1_MPUIO_BASE + OMAP_MPUIO_GPIO_DEBOUNCING);
260
261
262 omap_kp_scan_keypad(omap_kp, keypad_state);
263 omap_kp->irq = platform_get_irq(pdev, 0);
264 if (omap_kp->irq >= 0) {
265 if (request_irq(omap_kp->irq, omap_kp_interrupt, 0,
266 "omap-keypad", omap_kp) < 0)
267 goto err4;
268 }
269 omap_writew(0, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
270
271 return 0;
272
273err4:
274 input_unregister_device(omap_kp->input);
275 input_dev = NULL;
276err3:
277 device_remove_file(&pdev->dev, &dev_attr_enable);
278err2:
279 for (i = row_idx - 1; i >= 0; i--)
280 gpio_free(row_gpios[i]);
281 for (i = col_idx - 1; i >= 0; i--)
282 gpio_free(col_gpios[i]);
283
284 kfree(omap_kp);
285 input_free_device(input_dev);
286
287 return -EINVAL;
288}
289
290static int omap_kp_remove(struct platform_device *pdev)
291{
292 struct omap_kp *omap_kp = platform_get_drvdata(pdev);
293
294
295 tasklet_disable(&kp_tasklet);
296 omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
297 free_irq(omap_kp->irq, omap_kp);
298
299 del_timer_sync(&omap_kp->timer);
300 tasklet_kill(&kp_tasklet);
301
302
303 input_unregister_device(omap_kp->input);
304
305 kfree(omap_kp);
306
307 return 0;
308}
309
310static struct platform_driver omap_kp_driver = {
311 .probe = omap_kp_probe,
312 .remove = omap_kp_remove,
313 .driver = {
314 .name = "omap-keypad",
315 },
316};
317module_platform_driver(omap_kp_driver);
318
319MODULE_AUTHOR("Timo Teräs");
320MODULE_DESCRIPTION("OMAP Keypad Driver");
321MODULE_LICENSE("GPL");
322MODULE_ALIAS("platform:omap-keypad");
323
