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>
26 #include <linux/clk.h>
27 #include <linux/err.h>
29 #include <asm/mach-types.h>
30 #include <asm/mach/arch.h>
31 #include <asm/mach/map.h>
33 #include <asm/arch/hardware.h>
34 #include <asm/arch/pxa-regs.h>
35 #include <asm/arch/irqs.h>
36 #include <asm/arch/pxa27x_keyboard.h>
38 #define DRIVER_NAME "pxa27x-keyboard"
40 #define KPASMKP(col) (col/2 == 0 ? KPASMKP0 : \
41 col/2 == 1 ? KPASMKP1 : \
42 col/2 == 2 ? KPASMKP2 : KPASMKP3)
43 #define KPASMKPx_MKC(row, col) (1 << (row + 16 * (col % 2)))
45 static struct clk *pxakbd_clk;
47 static irqreturn_t pxakbd_irq_handler(int irq, void *dev_id)
49 struct platform_device *pdev = dev_id;
50 struct pxa27x_keyboard_platform_data *pdata = pdev->dev.platform_data;
51 struct input_dev *input_dev = platform_get_drvdata(pdev);
52 unsigned long kpc = KPC;
56 unsigned long kpdk = KPDK;
58 if (!(kpdk & KPDK_DKP)) {
59 /* better luck next time */
60 } else if (kpc & KPC_REE0) {
61 unsigned long kprec = KPREC;
64 if (kprec & KPREC_OF0)
65 rel = (kprec & 0xff) + 0x7f;
66 else if (kprec & KPREC_UF0)
67 rel = (kprec & 0xff) - 0x7f - 0xff;
69 rel = (kprec & 0xff) - 0x7f;
72 input_report_rel(input_dev, REL_WHEEL, rel);
73 input_sync(input_dev);
79 /* report the status of every button */
80 for (row = 0; row < pdata->nr_rows; row++) {
81 for (col = 0; col < pdata->nr_cols; col++) {
82 p = KPASMKP(col) & KPASMKPx_MKC(row, col) ?
84 pr_debug("keycode %x - pressed %x\n",
85 pdata->keycodes[row][col], p);
86 input_report_key(input_dev,
87 pdata->keycodes[row][col], p);
90 input_sync(input_dev);
96 static int pxakbd_open(struct input_dev *dev)
98 /* Set keypad control register */
101 (2 << 6) | KPC_REE0 | KPC_DK_DEB_SEL |
102 KPC_ME | KPC_MIE | KPC_DE | KPC_DIE);
104 KPC &= ~KPC_AS; /* disable automatic scan */
105 KPC &= ~KPC_IMKP; /* do not ignore multiple keypresses */
107 /* Set rotary count to mid-point value */
110 /* Enable unit clock */
111 clk_enable(pxakbd_clk);
116 static void pxakbd_close(struct input_dev *dev)
118 /* Disable clock unit */
119 clk_disable(pxakbd_clk);
123 static int pxakbd_suspend(struct platform_device *pdev, pm_message_t state)
125 struct pxa27x_keyboard_platform_data *pdata = pdev->dev.platform_data;
127 /* Save controller status */
128 pdata->reg_kpc = KPC;
129 pdata->reg_kprec = KPREC;
134 static int pxakbd_resume(struct platform_device *pdev)
136 struct pxa27x_keyboard_platform_data *pdata = pdev->dev.platform_data;
137 struct input_dev *input_dev = platform_get_drvdata(pdev);
139 mutex_lock(&input_dev->mutex);
141 if (input_dev->users) {
142 /* Restore controller status */
143 KPC = pdata->reg_kpc;
144 KPREC = pdata->reg_kprec;
146 /* Enable unit clock */
147 clk_disable(pxakbd_clk);
148 clk_enable(pxakbd_clk);
151 mutex_unlock(&input_dev->mutex);
156 #define pxakbd_suspend NULL
157 #define pxakbd_resume NULL
160 static int __devinit pxakbd_probe(struct platform_device *pdev)
162 struct pxa27x_keyboard_platform_data *pdata = pdev->dev.platform_data;
163 struct input_dev *input_dev;
164 int i, row, col, error;
166 pxakbd_clk = clk_get(&pdev->dev, "KBDCLK");
167 if (IS_ERR(pxakbd_clk)) {
168 error = PTR_ERR(pxakbd_clk);
172 /* Create and register the input driver. */
173 input_dev = input_allocate_device();
175 printk(KERN_ERR "Cannot request keypad device\n");
180 input_dev->name = DRIVER_NAME;
181 input_dev->id.bustype = BUS_HOST;
182 input_dev->open = pxakbd_open;
183 input_dev->close = pxakbd_close;
184 input_dev->dev.parent = &pdev->dev;
186 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP) |
188 input_dev->relbit[BIT_WORD(REL_WHEEL)] = BIT_MASK(REL_WHEEL);
189 for (row = 0; row < pdata->nr_rows; row++) {
190 for (col = 0; col < pdata->nr_cols; col++) {
191 int code = pdata->keycodes[row][col];
193 set_bit(code, input_dev->keybit);
197 error = request_irq(IRQ_KEYPAD, pxakbd_irq_handler, IRQF_DISABLED,
200 printk(KERN_ERR "Cannot request keypad IRQ\n");
204 platform_set_drvdata(pdev, input_dev);
206 /* Register the input device */
207 error = input_register_device(input_dev);
212 for (i = 0; i < pdata->nr_rows + pdata->nr_cols; i++)
213 pxa_gpio_mode(pdata->gpio_modes[i]);
216 * Store rows/cols info into keyboard registers.
219 KPC |= (pdata->nr_rows - 1) << 26;
220 KPC |= (pdata->nr_cols - 1) << 23;
222 for (col = 0; col < pdata->nr_cols; col++)
223 KPC |= KPC_MS0 << col;
228 platform_set_drvdata(pdev, NULL);
229 free_irq(IRQ_KEYPAD, pdev);
231 input_free_device(input_dev);
238 static int __devexit pxakbd_remove(struct platform_device *pdev)
240 struct input_dev *input_dev = platform_get_drvdata(pdev);
242 input_unregister_device(input_dev);
243 free_irq(IRQ_KEYPAD, pdev);
245 platform_set_drvdata(pdev, NULL);
250 static struct platform_driver pxakbd_driver = {
251 .probe = pxakbd_probe,
252 .remove = __devexit_p(pxakbd_remove),
253 .suspend = pxakbd_suspend,
254 .resume = pxakbd_resume,
260 static int __init pxakbd_init(void)
262 return platform_driver_register(&pxakbd_driver);
265 static void __exit pxakbd_exit(void)
267 platform_driver_unregister(&pxakbd_driver);
270 module_init(pxakbd_init);
271 module_exit(pxakbd_exit);
273 MODULE_DESCRIPTION("PXA27x Matrix Keyboard Driver");
274 MODULE_LICENSE("GPL");