2 * SPEAr Keyboard Driver
3 * Based on omap-keypad driver
5 * Copyright (C) 2010 ST Microelectronics
6 * Rajeev Kumar<rajeev-dlh.kumar@st.com>
8 * This file is licensed under the terms of the GNU General Public
9 * License version 2. This program is licensed "as is" without any
10 * warranty of any kind, whether express or implied.
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>
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>
28 /* Keyboard Registers */
29 #define MODE_REG 0x00 /* 16 bit reg */
30 #define STATUS_REG 0x0C /* 2 bit reg */
31 #define DATA_REG 0x10 /* 8 bit reg */
32 #define INTR_MASK 0x54
36 * pclk freq mask = (APB FEQ -1)= 82 MHZ.Programme bit 15-9 in mode
37 * control register as 1010010(82MHZ)
39 #define PCLK_FREQ_MSK 0xA400 /* 82 MHz */
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
48 #define KEY_MASK 0xFF000000
49 #define KEY_VALUE 0x00FFFFFF
51 #define COLUMN_MASK 0x0F
55 struct input_dev *input;
57 void __iomem *io_base;
60 unsigned short last_key;
61 unsigned short keycodes[256];
64 static irqreturn_t spear_kbd_interrupt(int irq, void *dev_id)
66 struct spear_kbd *kbd = dev_id;
67 struct input_dev *input = kbd->input;
71 sts = readb(kbd->io_base + STATUS_REG);
75 if (kbd->last_key != KEY_RESERVED) {
76 input_report_key(input, kbd->last_key, 0);
77 kbd->last_key = KEY_RESERVED;
80 /* following reads active (row, col) pair */
81 val = readb(kbd->io_base + DATA_REG);
82 key = kbd->keycodes[val];
84 input_event(input, EV_MSC, MSC_SCAN, val);
85 input_report_key(input, key, 1);
91 writeb(0, kbd->io_base + STATUS_REG);
96 static int spear_kbd_open(struct input_dev *dev)
98 struct spear_kbd *kbd = input_get_drvdata(dev);
102 kbd->last_key = KEY_RESERVED;
104 error = clk_enable(kbd->clk);
108 /* program keyboard */
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);
114 val = readw(kbd->io_base + MODE_REG);
116 writew(val, kbd->io_base + MODE_REG);
121 static void spear_kbd_close(struct input_dev *dev)
123 struct spear_kbd *kbd = input_get_drvdata(dev);
127 val = readw(kbd->io_base + MODE_REG);
129 writew(val, kbd->io_base + MODE_REG);
131 clk_disable(kbd->clk);
133 kbd->last_key = KEY_RESERVED;
136 static int __devinit spear_kbd_probe(struct platform_device *pdev)
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;
147 dev_err(&pdev->dev, "Invalid platform data\n");
151 keymap = pdata->keymap;
153 dev_err(&pdev->dev, "no keymap defined\n");
157 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
159 dev_err(&pdev->dev, "no keyboard resource defined\n");
163 irq = platform_get_irq(pdev, 0);
165 dev_err(&pdev->dev, "not able to get irq for the device\n");
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");
177 kbd->input = input_dev;
179 kbd->res = request_mem_region(res->start, resource_size(res),
182 dev_err(&pdev->dev, "keyboard region already claimed\n");
187 kbd->io_base = ioremap(res->start, resource_size(res));
189 dev_err(&pdev->dev, "ioremap failed for kbd_region\n");
191 goto err_release_mem_region;
194 kbd->clk = clk_get(&pdev->dev, NULL);
195 if (IS_ERR(kbd->clk)) {
196 error = PTR_ERR(kbd->clk);
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;
210 __set_bit(EV_KEY, input_dev->evbit);
212 __set_bit(EV_REP, input_dev->evbit);
213 input_set_capability(input_dev, EV_MSC, MSC_SCAN);
215 input_dev->keycode = kbd->keycodes;
216 input_dev->keycodesize = sizeof(kbd->keycodes[0]);
217 input_dev->keycodemax = ARRAY_SIZE(kbd->keycodes);
219 matrix_keypad_build_keymap(keymap, ROW_SHIFT,
220 input_dev->keycode, input_dev->keybit);
222 input_set_drvdata(input_dev, kbd);
224 error = request_irq(irq, spear_kbd_interrupt, 0, "keyboard", kbd);
226 dev_err(&pdev->dev, "request_irq fail\n");
230 error = input_register_device(input_dev);
232 dev_err(&pdev->dev, "Unable to register keyboard device\n");
236 device_init_wakeup(&pdev->dev, 1);
237 platform_set_drvdata(pdev, kbd);
242 free_irq(kbd->irq, kbd);
246 iounmap(kbd->io_base);
247 err_release_mem_region:
248 release_mem_region(res->start, resource_size(res));
250 input_free_device(input_dev);
256 static int __devexit spear_kbd_remove(struct platform_device *pdev)
258 struct spear_kbd *kbd = platform_get_drvdata(pdev);
260 free_irq(kbd->irq, kbd);
261 input_unregister_device(kbd->input);
263 iounmap(kbd->io_base);
264 release_mem_region(kbd->res->start, resource_size(kbd->res));
267 device_init_wakeup(&pdev->dev, 1);
268 platform_set_drvdata(pdev, NULL);
274 static int spear_kbd_suspend(struct device *dev)
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;
280 mutex_lock(&input_dev->mutex);
282 if (input_dev->users)
283 clk_enable(kbd->clk);
285 if (device_may_wakeup(&pdev->dev))
286 enable_irq_wake(kbd->irq);
288 mutex_unlock(&input_dev->mutex);
293 static int spear_kbd_resume(struct device *dev)
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;
299 mutex_lock(&input_dev->mutex);
301 if (device_may_wakeup(&pdev->dev))
302 disable_irq_wake(kbd->irq);
304 if (input_dev->users)
305 clk_enable(kbd->clk);
307 mutex_unlock(&input_dev->mutex);
312 static const struct dev_pm_ops spear_kbd_pm_ops = {
313 .suspend = spear_kbd_suspend,
314 .resume = spear_kbd_resume,
318 static struct platform_driver spear_kbd_driver = {
319 .probe = spear_kbd_probe,
320 .remove = __devexit_p(spear_kbd_remove),
323 .owner = THIS_MODULE,
325 .pm = &spear_kbd_pm_ops,
330 static int __init spear_kbd_init(void)
332 return platform_driver_register(&spear_kbd_driver);
334 module_init(spear_kbd_init);
336 static void __exit spear_kbd_exit(void)
338 platform_driver_unregister(&spear_kbd_driver);
340 module_exit(spear_kbd_exit);
342 MODULE_AUTHOR("Rajeev Kumar");
343 MODULE_DESCRIPTION("SPEAr Keyboard Driver");
344 MODULE_LICENSE("GPL");