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/drivers/input/keyboard/omap-keypad.c

http://github.com/mirrors/linux
C | 322 lines | 233 code | 63 blank | 26 comment | 37 complexity | 90304e8c67b0887dd46523a2eac2bf12 MD5 | raw file
  1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 * linux/drivers/input/keyboard/omap-keypad.c
  4 *
  5 * OMAP Keypad Driver
  6 *
  7 * Copyright (C) 2003 Nokia Corporation
  8 * Written by Timo Teräs <ext-timo.teras@nokia.com>
  9 *
 10 * Added support for H2 & H3 Keypad
 11 * Copyright (C) 2004 Texas Instruments
 12 */
 13
 14#include <linux/module.h>
 15#include <linux/interrupt.h>
 16#include <linux/types.h>
 17#include <linux/input.h>
 18#include <linux/kernel.h>
 19#include <linux/delay.h>
 20#include <linux/platform_device.h>
 21#include <linux/mutex.h>
 22#include <linux/errno.h>
 23#include <linux/slab.h>
 24#include <linux/gpio.h>
 25#include <linux/platform_data/gpio-omap.h>
 26#include <linux/platform_data/keypad-omap.h>
 27
 28#undef NEW_BOARD_LEARNING_MODE
 29
 30static void omap_kp_tasklet(unsigned long);
 31static void omap_kp_timer(struct timer_list *);
 32
 33static unsigned char keypad_state[8];
 34static DEFINE_MUTEX(kp_enable_mutex);
 35static int kp_enable = 1;
 36static int kp_cur_group = -1;
 37
 38struct omap_kp {
 39	struct input_dev *input;
 40	struct timer_list timer;
 41	int irq;
 42	unsigned int rows;
 43	unsigned int cols;
 44	unsigned long delay;
 45	unsigned int debounce;
 46	unsigned short keymap[];
 47};
 48
 49static DECLARE_TASKLET_DISABLED(kp_tasklet, omap_kp_tasklet, 0);
 50
 51static unsigned int *row_gpios;
 52static unsigned int *col_gpios;
 53
 54static irqreturn_t omap_kp_interrupt(int irq, void *dev_id)
 55{
 56	/* disable keyboard interrupt and schedule for handling */
 57	omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
 58
 59	tasklet_schedule(&kp_tasklet);
 60
 61	return IRQ_HANDLED;
 62}
 63
 64static void omap_kp_timer(struct timer_list *unused)
 65{
 66	tasklet_schedule(&kp_tasklet);
 67}
 68
 69static void omap_kp_scan_keypad(struct omap_kp *omap_kp, unsigned char *state)
 70{
 71	int col = 0;
 72
 73	/* disable keyboard interrupt and schedule for handling */
 74	omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
 75
 76	/* read the keypad status */
 77	omap_writew(0xff, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBC);
 78	for (col = 0; col < omap_kp->cols; col++) {
 79		omap_writew(~(1 << col) & 0xff,
 80			    OMAP1_MPUIO_BASE + OMAP_MPUIO_KBC);
 81
 82		udelay(omap_kp->delay);
 83
 84		state[col] = ~omap_readw(OMAP1_MPUIO_BASE +
 85					 OMAP_MPUIO_KBR_LATCH) & 0xff;
 86	}
 87	omap_writew(0x00, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBC);
 88	udelay(2);
 89}
 90
 91static void omap_kp_tasklet(unsigned long data)
 92{
 93	struct omap_kp *omap_kp_data = (struct omap_kp *) data;
 94	unsigned short *keycodes = omap_kp_data->input->keycode;
 95	unsigned int row_shift = get_count_order(omap_kp_data->cols);
 96	unsigned char new_state[8], changed, key_down = 0;
 97	int col, row;
 98
 99	/* check for any changes */
100	omap_kp_scan_keypad(omap_kp_data, new_state);
101
102	/* check for changes and print those */
103	for (col = 0; col < omap_kp_data->cols; col++) {
104		changed = new_state[col] ^ keypad_state[col];
105		key_down |= new_state[col];
106		if (changed == 0)
107			continue;
108
109		for (row = 0; row < omap_kp_data->rows; row++) {
110			int key;
111			if (!(changed & (1 << row)))
112				continue;
113#ifdef NEW_BOARD_LEARNING_MODE
114			printk(KERN_INFO "omap-keypad: key %d-%d %s\n", col,
115			       row, (new_state[col] & (1 << row)) ?
116			       "pressed" : "released");
117#else
118			key = keycodes[MATRIX_SCAN_CODE(row, col, row_shift)];
119
120			if (!(kp_cur_group == (key & GROUP_MASK) ||
121			      kp_cur_group == -1))
122				continue;
123
124			kp_cur_group = key & GROUP_MASK;
125			input_report_key(omap_kp_data->input, key & ~GROUP_MASK,
126					 new_state[col] & (1 << row));
127#endif
128		}
129	}
130	input_sync(omap_kp_data->input);
131	memcpy(keypad_state, new_state, sizeof(keypad_state));
132
133	if (key_down) {
134		/* some key is pressed - keep irq disabled and use timer
135		 * to poll the keypad */
136		mod_timer(&omap_kp_data->timer, jiffies + HZ / 20);
137	} else {
138		/* enable interrupts */
139		omap_writew(0, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
140		kp_cur_group = -1;
141	}
142}
143
144static ssize_t omap_kp_enable_show(struct device *dev,
145				   struct device_attribute *attr, char *buf)
146{
147	return sprintf(buf, "%u\n", kp_enable);
148}
149
150static ssize_t omap_kp_enable_store(struct device *dev, struct device_attribute *attr,
151				    const char *buf, size_t count)
152{
153	struct omap_kp *omap_kp = dev_get_drvdata(dev);
154	int state;
155
156	if (sscanf(buf, "%u", &state) != 1)
157		return -EINVAL;
158
159	if ((state != 1) && (state != 0))
160		return -EINVAL;
161
162	mutex_lock(&kp_enable_mutex);
163	if (state != kp_enable) {
164		if (state)
165			enable_irq(omap_kp->irq);
166		else
167			disable_irq(omap_kp->irq);
168		kp_enable = state;
169	}
170	mutex_unlock(&kp_enable_mutex);
171
172	return strnlen(buf, count);
173}
174
175static DEVICE_ATTR(enable, S_IRUGO | S_IWUSR, omap_kp_enable_show, omap_kp_enable_store);
176
177static int omap_kp_probe(struct platform_device *pdev)
178{
179	struct omap_kp *omap_kp;
180	struct input_dev *input_dev;
181	struct omap_kp_platform_data *pdata = dev_get_platdata(&pdev->dev);
182	int i, col_idx, row_idx, ret;
183	unsigned int row_shift, keycodemax;
184
185	if (!pdata->rows || !pdata->cols || !pdata->keymap_data) {
186		printk(KERN_ERR "No rows, cols or keymap_data from pdata\n");
187		return -EINVAL;
188	}
189
190	row_shift = get_count_order(pdata->cols);
191	keycodemax = pdata->rows << row_shift;
192
193	omap_kp = kzalloc(sizeof(struct omap_kp) +
194			keycodemax * sizeof(unsigned short), GFP_KERNEL);
195	input_dev = input_allocate_device();
196	if (!omap_kp || !input_dev) {
197		kfree(omap_kp);
198		input_free_device(input_dev);
199		return -ENOMEM;
200	}
201
202	platform_set_drvdata(pdev, omap_kp);
203
204	omap_kp->input = input_dev;
205
206	/* Disable the interrupt for the MPUIO keyboard */
207	omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
208
209	if (pdata->delay)
210		omap_kp->delay = pdata->delay;
211
212	if (pdata->row_gpios && pdata->col_gpios) {
213		row_gpios = pdata->row_gpios;
214		col_gpios = pdata->col_gpios;
215	}
216
217	omap_kp->rows = pdata->rows;
218	omap_kp->cols = pdata->cols;
219
220	col_idx = 0;
221	row_idx = 0;
222
223	timer_setup(&omap_kp->timer, omap_kp_timer, 0);
224
225	/* get the irq and init timer*/
226	kp_tasklet.data = (unsigned long) omap_kp;
227	tasklet_enable(&kp_tasklet);
228
229	ret = device_create_file(&pdev->dev, &dev_attr_enable);
230	if (ret < 0)
231		goto err2;
232
233	/* setup input device */
234	input_dev->name = "omap-keypad";
235	input_dev->phys = "omap-keypad/input0";
236	input_dev->dev.parent = &pdev->dev;
237
238	input_dev->id.bustype = BUS_HOST;
239	input_dev->id.vendor = 0x0001;
240	input_dev->id.product = 0x0001;
241	input_dev->id.version = 0x0100;
242
243	if (pdata->rep)
244		__set_bit(EV_REP, input_dev->evbit);
245
246	ret = matrix_keypad_build_keymap(pdata->keymap_data, NULL,
247					 pdata->rows, pdata->cols,
248					 omap_kp->keymap, input_dev);
249	if (ret < 0)
250		goto err3;
251
252	ret = input_register_device(omap_kp->input);
253	if (ret < 0) {
254		printk(KERN_ERR "Unable to register omap-keypad input device\n");
255		goto err3;
256	}
257
258	if (pdata->dbounce)
259		omap_writew(0xff, OMAP1_MPUIO_BASE + OMAP_MPUIO_GPIO_DEBOUNCING);
260
261	/* scan current status and enable interrupt */
262	omap_kp_scan_keypad(omap_kp, keypad_state);
263	omap_kp->irq = platform_get_irq(pdev, 0);
264	if (omap_kp->irq >= 0) {
265		if (request_irq(omap_kp->irq, omap_kp_interrupt, 0,
266				"omap-keypad", omap_kp) < 0)
267			goto err4;
268	}
269	omap_writew(0, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
270
271	return 0;
272
273err4:
274	input_unregister_device(omap_kp->input);
275	input_dev = NULL;
276err3:
277	device_remove_file(&pdev->dev, &dev_attr_enable);
278err2:
279	for (i = row_idx - 1; i >= 0; i--)
280		gpio_free(row_gpios[i]);
281	for (i = col_idx - 1; i >= 0; i--)
282		gpio_free(col_gpios[i]);
283
284	kfree(omap_kp);
285	input_free_device(input_dev);
286
287	return -EINVAL;
288}
289
290static int omap_kp_remove(struct platform_device *pdev)
291{
292	struct omap_kp *omap_kp = platform_get_drvdata(pdev);
293
294	/* disable keypad interrupt handling */
295	tasklet_disable(&kp_tasklet);
296	omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
297	free_irq(omap_kp->irq, omap_kp);
298
299	del_timer_sync(&omap_kp->timer);
300	tasklet_kill(&kp_tasklet);
301
302	/* unregister everything */
303	input_unregister_device(omap_kp->input);
304
305	kfree(omap_kp);
306
307	return 0;
308}
309
310static struct platform_driver omap_kp_driver = {
311	.probe		= omap_kp_probe,
312	.remove		= omap_kp_remove,
313	.driver		= {
314		.name	= "omap-keypad",
315	},
316};
317module_platform_driver(omap_kp_driver);
318
319MODULE_AUTHOR("Timo Teräs");
320MODULE_DESCRIPTION("OMAP Keypad Driver");
321MODULE_LICENSE("GPL");
322MODULE_ALIAS("platform:omap-keypad");