2 * linux/drivers/input/keyboard/pxa27x_keyboard.c
4 * Driver for the pxa27x matrix keyboard controller.
6 * Created: Feb 22, 2007
7 * Author: Rodolfo Giometti <giometti@linux.it>
9 * Based on a previous implementations by Kevin O'Connor
10 * <kevin_at_koconnor.net> and Alex Osborne <bobofdoom@gmail.com> and
11 * on some suggestions by Nicolas Pitre <nico@cam.org>.
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License version 2 as
15 * published by the Free Software Foundation.
19 #include <linux/kernel.h>
20 #include <linux/module.h>
21 #include <linux/init.h>
22 #include <linux/interrupt.h>
23 #include <linux/input.h>
24 #include <linux/device.h>
25 #include <linux/platform_device.h>
27 #include <asm/mach-types.h>
28 #include <asm/mach/arch.h>
29 #include <asm/mach/map.h>
31 #include <asm/arch/hardware.h>
32 #include <asm/arch/pxa-regs.h>
33 #include <asm/arch/irqs.h>
34 #include <asm/arch/pxa27x_keyboard.h>
36 #define DRIVER_NAME "pxa27x-keyboard"
38 #define KPASMKP(col) (col/2 == 0 ? KPASMKP0 : \
39 col/2 == 1 ? KPASMKP1 : \
40 col/2 == 2 ? KPASMKP2 : KPASMKP3)
41 #define KPASMKPx_MKC(row, col) (1 << (row + 16 * (col % 2)))
43 static irqreturn_t pxakbd_irq_handler(int irq, void *dev_id)
45 struct platform_device *pdev = dev_id;
46 struct pxa27x_keyboard_platform_data *pdata = pdev->dev.platform_data;
47 struct input_dev *input_dev = platform_get_drvdata(pdev);
48 unsigned long kpc = KPC;
52 unsigned long kpdk = KPDK;
54 if (!(kpdk & KPDK_DKP)) {
55 /* better luck next time */
56 } else if (kpc & KPC_REE0) {
57 unsigned long kprec = KPREC;
60 if (kprec & KPREC_OF0)
61 rel = (kprec & 0xff) + 0x7f;
62 else if (kprec & KPREC_UF0)
63 rel = (kprec & 0xff) - 0x7f - 0xff;
65 rel = (kprec & 0xff) - 0x7f;
68 input_report_rel(input_dev, REL_WHEEL, rel);
69 input_sync(input_dev);
75 /* report the status of every button */
76 for (row = 0; row < pdata->nr_rows; row++) {
77 for (col = 0; col < pdata->nr_cols; col++) {
78 p = KPASMKP(col) & KPASMKPx_MKC(row, col) ?
80 pr_debug("keycode %x - pressed %x\n",
81 pdata->keycodes[row][col], p);
82 input_report_key(input_dev,
83 pdata->keycodes[row][col], p);
86 input_sync(input_dev);
92 static int pxakbd_open(struct input_dev *dev)
94 /* Set keypad control register */
97 (2 << 6) | KPC_REE0 | KPC_DK_DEB_SEL |
98 KPC_ME | KPC_MIE | KPC_DE | KPC_DIE);
100 KPC &= ~KPC_AS; /* disable automatic scan */
101 KPC &= ~KPC_IMKP; /* do not ignore multiple keypresses */
103 /* Set rotary count to mid-point value */
106 /* Enable unit clock */
107 pxa_set_cken(CKEN_KEYPAD, 1);
112 static void pxakbd_close(struct input_dev *dev)
114 /* Disable clock unit */
115 pxa_set_cken(CKEN_KEYPAD, 0);
119 static int pxakbd_suspend(struct platform_device *pdev, pm_message_t state)
121 struct pxa27x_keyboard_platform_data *pdata = pdev->dev.platform_data;
123 /* Save controller status */
124 pdata->reg_kpc = KPC;
125 pdata->reg_kprec = KPREC;
130 static int pxakbd_resume(struct platform_device *pdev)
132 struct pxa27x_keyboard_platform_data *pdata = pdev->dev.platform_data;
133 struct input_dev *input_dev = platform_get_drvdata(pdev);
135 mutex_lock(&input_dev->mutex);
137 if (input_dev->users) {
138 /* Restore controller status */
139 KPC = pdata->reg_kpc;
140 KPREC = pdata->reg_kprec;
142 /* Enable unit clock */
143 pxa_set_cken(CKEN_KEYPAD, 1);
146 mutex_unlock(&input_dev->mutex);
151 #define pxakbd_suspend NULL
152 #define pxakbd_resume NULL
155 static int __devinit pxakbd_probe(struct platform_device *pdev)
157 struct pxa27x_keyboard_platform_data *pdata = pdev->dev.platform_data;
158 struct input_dev *input_dev;
159 int i, row, col, error;
161 /* Create and register the input driver. */
162 input_dev = input_allocate_device();
164 printk(KERN_ERR "Cannot request keypad device\n");
168 input_dev->name = DRIVER_NAME;
169 input_dev->id.bustype = BUS_HOST;
170 input_dev->open = pxakbd_open;
171 input_dev->close = pxakbd_close;
172 input_dev->dev.parent = &pdev->dev;
174 input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_REP) | BIT(EV_REL);
175 input_dev->relbit[LONG(REL_WHEEL)] = BIT(REL_WHEEL);
176 for (row = 0; row < pdata->nr_rows; row++) {
177 for (col = 0; col < pdata->nr_cols; col++) {
178 int code = pdata->keycodes[row][col];
180 set_bit(code, input_dev->keybit);
184 error = request_irq(IRQ_KEYPAD, pxakbd_irq_handler, IRQF_DISABLED,
187 printk(KERN_ERR "Cannot request keypad IRQ\n");
188 pxa_set_cken(CKEN_KEYPAD, 0);
192 platform_set_drvdata(pdev, input_dev);
194 /* Register the input device */
195 error = input_register_device(input_dev);
200 for (i = 0; i < pdata->nr_rows + pdata->nr_cols; i++)
201 pxa_gpio_mode(pdata->gpio_modes[i]);
204 * Store rows/cols info into keyboard registers.
207 KPC |= (pdata->nr_rows - 1) << 26;
208 KPC |= (pdata->nr_cols - 1) << 23;
210 for (col = 0; col < pdata->nr_cols; col++)
211 KPC |= KPC_MS0 << col;
216 platform_set_drvdata(pdev, NULL);
217 free_irq(IRQ_KEYPAD, pdev);
219 input_free_device(input_dev);
223 static int __devexit pxakbd_remove(struct platform_device *pdev)
225 struct input_dev *input_dev = platform_get_drvdata(pdev);
227 input_unregister_device(input_dev);
228 free_irq(IRQ_KEYPAD, pdev);
229 platform_set_drvdata(pdev, NULL);
234 static struct platform_driver pxakbd_driver = {
235 .probe = pxakbd_probe,
236 .remove = __devexit_p(pxakbd_remove),
237 .suspend = pxakbd_suspend,
238 .resume = pxakbd_resume,
244 static int __init pxakbd_init(void)
246 return platform_driver_register(&pxakbd_driver);
249 static void __exit pxakbd_exit(void)
251 platform_driver_unregister(&pxakbd_driver);
254 module_init(pxakbd_init);
255 module_exit(pxakbd_exit);
257 MODULE_DESCRIPTION("PXA27x Matrix Keyboard Driver");
258 MODULE_LICENSE("GPL");