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13#include <linux/clk.h>
14#include <linux/errno.h>
15#include <linux/init.h>
16#include <linux/interrupt.h>
17#include <linux/input.h>
18#include <linux/io.h>
19#include <linux/irq.h>
20#include <linux/kernel.h>
21#include <linux/module.h>
22#include <linux/platform_device.h>
23#include <linux/pm_wakeup.h>
24#include <linux/slab.h>
25#include <linux/types.h>
26#include <plat/keyboard.h>
27
28
29#define MODE_REG 0x00
30#define STATUS_REG 0x0C
31#define DATA_REG 0x10
32#define INTR_MASK 0x54
33
34
35
36
37
38
39#define PCLK_FREQ_MSK 0xA400
40#define START_SCAN 0x0100
41#define SCAN_RATE_10 0x0000
42#define SCAN_RATE_20 0x0004
43#define SCAN_RATE_40 0x0008
44#define SCAN_RATE_80 0x000C
45#define MODE_KEYBOARD 0x0002
46#define DATA_AVAIL 0x2
47
48#define KEY_MASK 0xFF000000
49#define KEY_VALUE 0x00FFFFFF
50#define ROW_MASK 0xF0
51#define COLUMN_MASK 0x0F
52#define ROW_SHIFT 4
53
54struct spear_kbd {
55 struct input_dev *input;
56 struct resource *res;
57 void __iomem *io_base;
58 struct clk *clk;
59 unsigned int irq;
60 unsigned short last_key;
61 unsigned short keycodes[256];
62};
63
64static irqreturn_t spear_kbd_interrupt(int irq, void *dev_id)
65{
66 struct spear_kbd *kbd = dev_id;
67 struct input_dev *input = kbd->input;
68 unsigned int key;
69 u8 sts, val;
70
71 sts = readb(kbd->io_base + STATUS_REG);
72 if (sts & DATA_AVAIL)
73 return IRQ_NONE;
74
75 if (kbd->last_key != KEY_RESERVED) {
76 input_report_key(input, kbd->last_key, 0);
77 kbd->last_key = KEY_RESERVED;
78 }
79
80
81 val = readb(kbd->io_base + DATA_REG);
82 key = kbd->keycodes[val];
83
84 input_event(input, EV_MSC, MSC_SCAN, val);
85 input_report_key(input, key, 1);
86 input_sync(input);
87
88 kbd->last_key = key;
89
90
91 writeb(0, kbd->io_base + STATUS_REG);
92
93 return IRQ_HANDLED;
94}
95
96static int spear_kbd_open(struct input_dev *dev)
97{
98 struct spear_kbd *kbd = input_get_drvdata(dev);
99 int error;
100 u16 val;
101
102 kbd->last_key = KEY_RESERVED;
103
104 error = clk_enable(kbd->clk);
105 if (error)
106 return error;
107
108
109 val = SCAN_RATE_80 | MODE_KEYBOARD | PCLK_FREQ_MSK;
110 writew(val, kbd->io_base + MODE_REG);
111 writeb(1, kbd->io_base + STATUS_REG);
112
113
114 val = readw(kbd->io_base + MODE_REG);
115 val |= START_SCAN;
116 writew(val, kbd->io_base + MODE_REG);
117
118 return 0;
119}
120
121static void spear_kbd_close(struct input_dev *dev)
122{
123 struct spear_kbd *kbd = input_get_drvdata(dev);
124 u16 val;
125
126
127 val = readw(kbd->io_base + MODE_REG);
128 val &= ~START_SCAN;
129 writew(val, kbd->io_base + MODE_REG);
130
131 clk_disable(kbd->clk);
132
133 kbd->last_key = KEY_RESERVED;
134}
135
136static int __devinit spear_kbd_probe(struct platform_device *pdev)
137{
138 const struct kbd_platform_data *pdata = pdev->dev.platform_data;
139 const struct matrix_keymap_data *keymap;
140 struct spear_kbd *kbd;
141 struct input_dev *input_dev;
142 struct resource *res;
143 int irq;
144 int error;
145
146 if (!pdata) {
147 dev_err(&pdev->dev, "Invalid platform data\n");
148 return -EINVAL;
149 }
150
151 keymap = pdata->keymap;
152 if (!keymap) {
153 dev_err(&pdev->dev, "no keymap defined\n");
154 return -EINVAL;
155 }
156
157 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
158 if (!res) {
159 dev_err(&pdev->dev, "no keyboard resource defined\n");
160 return -EBUSY;
161 }
162
163 irq = platform_get_irq(pdev, 0);
164 if (irq < 0) {
165 dev_err(&pdev->dev, "not able to get irq for the device\n");
166 return irq;
167 }
168
169 kbd = kzalloc(sizeof(*kbd), GFP_KERNEL);
170 input_dev = input_allocate_device();
171 if (!kbd || !input_dev) {
172 dev_err(&pdev->dev, "out of memory\n");
173 error = -ENOMEM;
174 goto err_free_mem;
175 }
176
177 kbd->input = input_dev;
178 kbd->irq = irq;
179 kbd->res = request_mem_region(res->start, resource_size(res),
180 pdev->name);
181 if (!kbd->res) {
182 dev_err(&pdev->dev, "keyboard region already claimed\n");
183 error = -EBUSY;
184 goto err_free_mem;
185 }
186
187 kbd->io_base = ioremap(res->start, resource_size(res));
188 if (!kbd->io_base) {
189 dev_err(&pdev->dev, "ioremap failed for kbd_region\n");
190 error = -ENOMEM;
191 goto err_release_mem_region;
192 }
193
194 kbd->clk = clk_get(&pdev->dev, NULL);
195 if (IS_ERR(kbd->clk)) {
196 error = PTR_ERR(kbd->clk);
197 goto err_iounmap;
198 }
199
200 input_dev->name = "Spear Keyboard";
201 input_dev->phys = "keyboard/input0";
202 input_dev->dev.parent = &pdev->dev;
203 input_dev->id.bustype = BUS_HOST;
204 input_dev->id.vendor = 0x0001;
205 input_dev->id.product = 0x0001;
206 input_dev->id.version = 0x0100;
207 input_dev->open = spear_kbd_open;
208 input_dev->close = spear_kbd_close;
209
210 __set_bit(EV_KEY, input_dev->evbit);
211 if (pdata->rep)
212 __set_bit(EV_REP, input_dev->evbit);
213 input_set_capability(input_dev, EV_MSC, MSC_SCAN);
214
215 input_dev->keycode = kbd->keycodes;
216 input_dev->keycodesize = sizeof(kbd->keycodes[0]);
217 input_dev->keycodemax = ARRAY_SIZE(kbd->keycodes);
218
219 matrix_keypad_build_keymap(keymap, ROW_SHIFT,
220 input_dev->keycode, input_dev->keybit);
221
222 input_set_drvdata(input_dev, kbd);
223
224 error = request_irq(irq, spear_kbd_interrupt, 0, "keyboard", kbd);
225 if (error) {
226 dev_err(&pdev->dev, "request_irq fail\n");
227 goto err_put_clk;
228 }
229
230 error = input_register_device(input_dev);
231 if (error) {
232 dev_err(&pdev->dev, "Unable to register keyboard device\n");
233 goto err_free_irq;
234 }
235
236 device_init_wakeup(&pdev->dev, 1);
237 platform_set_drvdata(pdev, kbd);
238
239 return 0;
240
241err_free_irq:
242 free_irq(kbd->irq, kbd);
243err_put_clk:
244 clk_put(kbd->clk);
245err_iounmap:
246 iounmap(kbd->io_base);
247err_release_mem_region:
248 release_mem_region(res->start, resource_size(res));
249err_free_mem:
250 input_free_device(input_dev);
251 kfree(kbd);
252
253 return error;
254}
255
256static int __devexit spear_kbd_remove(struct platform_device *pdev)
257{
258 struct spear_kbd *kbd = platform_get_drvdata(pdev);
259
260 free_irq(kbd->irq, kbd);
261 input_unregister_device(kbd->input);
262 clk_put(kbd->clk);
263 iounmap(kbd->io_base);
264 release_mem_region(kbd->res->start, resource_size(kbd->res));
265 kfree(kbd);
266
267 device_init_wakeup(&pdev->dev, 1);
268 platform_set_drvdata(pdev, NULL);
269
270 return 0;
271}
272
273#ifdef CONFIG_PM
274static int spear_kbd_suspend(struct device *dev)
275{
276 struct platform_device *pdev = to_platform_device(dev);
277 struct spear_kbd *kbd = platform_get_drvdata(pdev);
278 struct input_dev *input_dev = kbd->input;
279
280 mutex_lock(&input_dev->mutex);
281
282 if (input_dev->users)
283 clk_enable(kbd->clk);
284
285 if (device_may_wakeup(&pdev->dev))
286 enable_irq_wake(kbd->irq);
287
288 mutex_unlock(&input_dev->mutex);
289
290 return 0;
291}
292
293static int spear_kbd_resume(struct device *dev)
294{
295 struct platform_device *pdev = to_platform_device(dev);
296 struct spear_kbd *kbd = platform_get_drvdata(pdev);
297 struct input_dev *input_dev = kbd->input;
298
299 mutex_lock(&input_dev->mutex);
300
301 if (device_may_wakeup(&pdev->dev))
302 disable_irq_wake(kbd->irq);
303
304 if (input_dev->users)
305 clk_enable(kbd->clk);
306
307 mutex_unlock(&input_dev->mutex);
308
309 return 0;
310}
311
312static const struct dev_pm_ops spear_kbd_pm_ops = {
313 .suspend = spear_kbd_suspend,
314 .resume = spear_kbd_resume,
315};
316#endif
317
318static struct platform_driver spear_kbd_driver = {
319 .probe = spear_kbd_probe,
320 .remove = __devexit_p(spear_kbd_remove),
321 .driver = {
322 .name = "keyboard",
323 .owner = THIS_MODULE,
324#ifdef CONFIG_PM
325 .pm = &spear_kbd_pm_ops,
326#endif
327 },
328};
329
330static int __init spear_kbd_init(void)
331{
332 return platform_driver_register(&spear_kbd_driver);
333}
334module_init(spear_kbd_init);
335
336static void __exit spear_kbd_exit(void)
337{
338 platform_driver_unregister(&spear_kbd_driver);
339}
340module_exit(spear_kbd_exit);
341
342MODULE_AUTHOR("Rajeev Kumar");
343MODULE_DESCRIPTION("SPEAr Keyboard Driver");
344MODULE_LICENSE("GPL");
345
