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a17f7955 AA |
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> | |
5ad567ff | 32 | #include <linux/pm_runtime.h> |
a17f7955 | 33 | |
0f1142a5 | 34 | #include <linux/platform_data/omap4-keypad.h> |
a17f7955 AA |
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 */ | |
a17f7955 AA |
55 | #define OMAP4_DEF_IRQENABLE_EVENTEN (1 << 0) |
56 | #define OMAP4_DEF_IRQENABLE_LONGKEY (1 << 1) | |
57 | #define OMAP4_DEF_IRQENABLE_TIMEOUTEN (1 << 2) | |
9a34bc61 MT |
58 | #define OMAP4_DEF_WUP_EVENT_ENA (1 << 0) |
59 | #define OMAP4_DEF_WUP_LONG_KEY_ENA (1 << 1) | |
a17f7955 AA |
60 | #define OMAP4_DEF_CTRL_NOSOFTMODE (1 << 1) |
61 | #define OMAP4_DEF_CTRLPTVVALUE (1 << 2) | |
62 | #define OMAP4_DEF_CTRLPTV (1 << 1) | |
a17f7955 AA |
63 | |
64 | /* OMAP4 values */ | |
05362f48 | 65 | #define OMAP4_VAL_IRQDISABLE 0x00 |
a17f7955 AA |
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 | ||
a17f7955 AA |
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 */ | |
05362f48 | 94 | __raw_writel(OMAP4_VAL_IRQDISABLE, |
a17f7955 AA |
95 | keypad_data->base + OMAP4_KBD_IRQENABLE); |
96 | ||
97 | *new_state = __raw_readl(keypad_data->base + OMAP4_KBD_FULLCODE31_0); | |
05362f48 AA |
98 | *(new_state + 1) = __raw_readl(keypad_data->base |
99 | + OMAP4_KBD_FULLCODE63_32); | |
a17f7955 AA |
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 | ||
5ad567ff AA |
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 | ||
a17f7955 AA |
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; | |
f3a1ba60 AA |
182 | struct resource *res; |
183 | resource_size_t size; | |
a17f7955 | 184 | unsigned int row_shift, max_keys; |
f3a1ba60 | 185 | int irq; |
a17f7955 AA |
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 | ||
f3a1ba60 AA |
195 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
196 | if (!res) { | |
a17f7955 AA |
197 | dev_err(&pdev->dev, "no base address specified\n"); |
198 | return -EINVAL; | |
199 | } | |
200 | ||
f3a1ba60 AA |
201 | irq = platform_get_irq(pdev, 0); |
202 | if (!irq) { | |
a17f7955 AA |
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 | ||
f3a1ba60 AA |
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 | } | |
a17f7955 | 231 | |
f3a1ba60 AA |
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; | |
a17f7955 AA |
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; | |
f3a1ba60 | 248 | goto err_unmap; |
a17f7955 AA |
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 | ||
5ad567ff AA |
258 | input_dev->open = omap4_keypad_open; |
259 | input_dev->close = omap4_keypad_close; | |
260 | ||
a17f7955 AA |
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 | ||
a17f7955 | 275 | error = request_irq(keypad_data->irq, omap4_keypad_interrupt, |
f8038c42 | 276 | IRQF_TRIGGER_RISING, |
a17f7955 AA |
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 | ||
5ad567ff AA |
283 | pm_runtime_enable(&pdev->dev); |
284 | ||
a17f7955 AA |
285 | error = input_register_device(keypad_data->input); |
286 | if (error < 0) { | |
287 | dev_err(&pdev->dev, "failed to register input device\n"); | |
5ad567ff | 288 | goto err_pm_disable; |
a17f7955 AA |
289 | } |
290 | ||
a17f7955 AA |
291 | platform_set_drvdata(pdev, keypad_data); |
292 | return 0; | |
293 | ||
5ad567ff AA |
294 | err_pm_disable: |
295 | pm_runtime_disable(&pdev->dev); | |
a17f7955 AA |
296 | free_irq(keypad_data->irq, keypad_data); |
297 | err_free_input: | |
298 | input_free_device(input_dev); | |
f3a1ba60 AA |
299 | err_unmap: |
300 | iounmap(keypad_data->base); | |
301 | err_release_mem: | |
302 | release_mem_region(res->start, size); | |
a17f7955 AA |
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); | |
f3a1ba60 | 311 | struct resource *res; |
a17f7955 AA |
312 | |
313 | free_irq(keypad_data->irq, keypad_data); | |
5ad567ff AA |
314 | |
315 | pm_runtime_disable(&pdev->dev); | |
316 | ||
a17f7955 | 317 | input_unregister_device(keypad_data->input); |
f3a1ba60 AA |
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 | ||
a17f7955 AA |
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 | }; | |
5146c84f | 338 | module_platform_driver(omap4_keypad_driver); |
a17f7955 AA |
339 | |
340 | MODULE_AUTHOR("Texas Instruments"); | |
341 | MODULE_DESCRIPTION("OMAP4 Keypad Driver"); | |
342 | MODULE_LICENSE("GPL"); | |
343 | MODULE_ALIAS("platform:omap4-keypad"); |