1d2912cb1SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only
2bab7614dSEric Miao /*
3bab7614dSEric Miao * GPIO driven matrix keyboard driver
4bab7614dSEric Miao *
5bab7614dSEric Miao * Copyright (c) 2008 Marek Vasut <marek.vasut@gmail.com>
6bab7614dSEric Miao *
7bab7614dSEric Miao * Based on corgikbd.c
8bab7614dSEric Miao */
9bab7614dSEric Miao
10bab7614dSEric Miao #include <linux/types.h>
11bab7614dSEric Miao #include <linux/delay.h>
127aacc42fSAndy Shevchenko #include <linux/gpio/consumer.h>
13bab7614dSEric Miao #include <linux/platform_device.h>
14bab7614dSEric Miao #include <linux/input.h>
15bab7614dSEric Miao #include <linux/irq.h>
16bab7614dSEric Miao #include <linux/interrupt.h>
17bab7614dSEric Miao #include <linux/jiffies.h>
18bab7614dSEric Miao #include <linux/module.h>
19bab7614dSEric Miao #include <linux/gpio.h>
20bab7614dSEric Miao #include <linux/input/matrix_keypad.h>
215a0e3ad6STejun Heo #include <linux/slab.h>
224a83eecfSAnilKumar Ch #include <linux/of.h>
234a83eecfSAnilKumar Ch #include <linux/of_gpio.h>
244a83eecfSAnilKumar Ch #include <linux/of_platform.h>
25bab7614dSEric Miao
26bab7614dSEric Miao struct matrix_keypad {
27bab7614dSEric Miao const struct matrix_keypad_platform_data *pdata;
28bab7614dSEric Miao struct input_dev *input_dev;
29d82f1c35SEric Miao unsigned int row_shift;
30bab7614dSEric Miao
31dd219234SDmitry Torokhov DECLARE_BITMAP(disabled_gpios, MATRIX_MAX_ROWS);
32dd219234SDmitry Torokhov
33bab7614dSEric Miao uint32_t last_key_state[MATRIX_MAX_COLS];
34bab7614dSEric Miao struct delayed_work work;
35dd219234SDmitry Torokhov spinlock_t lock;
36bab7614dSEric Miao bool scan_pending;
37bab7614dSEric Miao bool stopped;
38fb76dd10SLuotao Fu bool gpio_all_disabled;
39bab7614dSEric Miao };
40bab7614dSEric Miao
41bab7614dSEric Miao /*
42aa0e26bbSDavid Rivshin * NOTE: If drive_inactive_cols is false, then the GPIO has to be put into
43aa0e26bbSDavid Rivshin * HiZ when de-activated to cause minmal side effect when scanning other
44aa0e26bbSDavid Rivshin * columns. In that case it is configured here to be input, otherwise it is
45aa0e26bbSDavid Rivshin * driven with the inactive value.
46bab7614dSEric Miao */
__activate_col(const struct matrix_keypad_platform_data * pdata,int col,bool on)47bab7614dSEric Miao static void __activate_col(const struct matrix_keypad_platform_data *pdata,
48bab7614dSEric Miao int col, bool on)
49bab7614dSEric Miao {
50bab7614dSEric Miao bool level_on = !pdata->active_low;
51bab7614dSEric Miao
52bab7614dSEric Miao if (on) {
53bab7614dSEric Miao gpio_direction_output(pdata->col_gpios[col], level_on);
54bab7614dSEric Miao } else {
55bab7614dSEric Miao gpio_set_value_cansleep(pdata->col_gpios[col], !level_on);
56aa0e26bbSDavid Rivshin if (!pdata->drive_inactive_cols)
57bab7614dSEric Miao gpio_direction_input(pdata->col_gpios[col]);
58bab7614dSEric Miao }
59bab7614dSEric Miao }
60bab7614dSEric Miao
activate_col(const struct matrix_keypad_platform_data * pdata,int col,bool on)61bab7614dSEric Miao static void activate_col(const struct matrix_keypad_platform_data *pdata,
62bab7614dSEric Miao int col, bool on)
63bab7614dSEric Miao {
64bab7614dSEric Miao __activate_col(pdata, col, on);
65bab7614dSEric Miao
66bab7614dSEric Miao if (on && pdata->col_scan_delay_us)
67bab7614dSEric Miao udelay(pdata->col_scan_delay_us);
68bab7614dSEric Miao }
69bab7614dSEric Miao
activate_all_cols(const struct matrix_keypad_platform_data * pdata,bool on)70bab7614dSEric Miao static void activate_all_cols(const struct matrix_keypad_platform_data *pdata,
71bab7614dSEric Miao bool on)
72bab7614dSEric Miao {
73bab7614dSEric Miao int col;
74bab7614dSEric Miao
75bab7614dSEric Miao for (col = 0; col < pdata->num_col_gpios; col++)
76bab7614dSEric Miao __activate_col(pdata, col, on);
77bab7614dSEric Miao }
78bab7614dSEric Miao
row_asserted(const struct matrix_keypad_platform_data * pdata,int row)79bab7614dSEric Miao static bool row_asserted(const struct matrix_keypad_platform_data *pdata,
80bab7614dSEric Miao int row)
81bab7614dSEric Miao {
82bab7614dSEric Miao return gpio_get_value_cansleep(pdata->row_gpios[row]) ?
83bab7614dSEric Miao !pdata->active_low : pdata->active_low;
84bab7614dSEric Miao }
85bab7614dSEric Miao
enable_row_irqs(struct matrix_keypad * keypad)86bab7614dSEric Miao static void enable_row_irqs(struct matrix_keypad *keypad)
87bab7614dSEric Miao {
88bab7614dSEric Miao const struct matrix_keypad_platform_data *pdata = keypad->pdata;
89bab7614dSEric Miao int i;
90bab7614dSEric Miao
91fb76dd10SLuotao Fu if (pdata->clustered_irq > 0)
92fb76dd10SLuotao Fu enable_irq(pdata->clustered_irq);
93fb76dd10SLuotao Fu else {
94bab7614dSEric Miao for (i = 0; i < pdata->num_row_gpios; i++)
95bab7614dSEric Miao enable_irq(gpio_to_irq(pdata->row_gpios[i]));
96bab7614dSEric Miao }
97fb76dd10SLuotao Fu }
98bab7614dSEric Miao
disable_row_irqs(struct matrix_keypad * keypad)99bab7614dSEric Miao static void disable_row_irqs(struct matrix_keypad *keypad)
100bab7614dSEric Miao {
101bab7614dSEric Miao const struct matrix_keypad_platform_data *pdata = keypad->pdata;
102bab7614dSEric Miao int i;
103bab7614dSEric Miao
104fb76dd10SLuotao Fu if (pdata->clustered_irq > 0)
105fb76dd10SLuotao Fu disable_irq_nosync(pdata->clustered_irq);
106fb76dd10SLuotao Fu else {
107bab7614dSEric Miao for (i = 0; i < pdata->num_row_gpios; i++)
108bab7614dSEric Miao disable_irq_nosync(gpio_to_irq(pdata->row_gpios[i]));
109bab7614dSEric Miao }
110fb76dd10SLuotao Fu }
111bab7614dSEric Miao
112bab7614dSEric Miao /*
113bab7614dSEric Miao * This gets the keys from keyboard and reports it to input subsystem
114bab7614dSEric Miao */
matrix_keypad_scan(struct work_struct * work)115bab7614dSEric Miao static void matrix_keypad_scan(struct work_struct *work)
116bab7614dSEric Miao {
117bab7614dSEric Miao struct matrix_keypad *keypad =
118bab7614dSEric Miao container_of(work, struct matrix_keypad, work.work);
119bab7614dSEric Miao struct input_dev *input_dev = keypad->input_dev;
1204a83eecfSAnilKumar Ch const unsigned short *keycodes = input_dev->keycode;
121bab7614dSEric Miao const struct matrix_keypad_platform_data *pdata = keypad->pdata;
122bab7614dSEric Miao uint32_t new_state[MATRIX_MAX_COLS];
123bab7614dSEric Miao int row, col, code;
124bab7614dSEric Miao
125bab7614dSEric Miao /* de-activate all columns for scanning */
126bab7614dSEric Miao activate_all_cols(pdata, false);
127bab7614dSEric Miao
128bab7614dSEric Miao memset(new_state, 0, sizeof(new_state));
129bab7614dSEric Miao
13001c84b03SSiarhei Volkau for (row = 0; row < pdata->num_row_gpios; row++)
13101c84b03SSiarhei Volkau gpio_direction_input(pdata->row_gpios[row]);
13201c84b03SSiarhei Volkau
133bab7614dSEric Miao /* assert each column and read the row status out */
134bab7614dSEric Miao for (col = 0; col < pdata->num_col_gpios; col++) {
135bab7614dSEric Miao
136bab7614dSEric Miao activate_col(pdata, col, true);
137bab7614dSEric Miao
138bab7614dSEric Miao for (row = 0; row < pdata->num_row_gpios; row++)
139bab7614dSEric Miao new_state[col] |=
140bab7614dSEric Miao row_asserted(pdata, row) ? (1 << row) : 0;
141bab7614dSEric Miao
142bab7614dSEric Miao activate_col(pdata, col, false);
143bab7614dSEric Miao }
144bab7614dSEric Miao
145bab7614dSEric Miao for (col = 0; col < pdata->num_col_gpios; col++) {
146bab7614dSEric Miao uint32_t bits_changed;
147bab7614dSEric Miao
148bab7614dSEric Miao bits_changed = keypad->last_key_state[col] ^ new_state[col];
149bab7614dSEric Miao if (bits_changed == 0)
150bab7614dSEric Miao continue;
151bab7614dSEric Miao
152bab7614dSEric Miao for (row = 0; row < pdata->num_row_gpios; row++) {
153bab7614dSEric Miao if ((bits_changed & (1 << row)) == 0)
154bab7614dSEric Miao continue;
155bab7614dSEric Miao
156d82f1c35SEric Miao code = MATRIX_SCAN_CODE(row, col, keypad->row_shift);
157bab7614dSEric Miao input_event(input_dev, EV_MSC, MSC_SCAN, code);
158bab7614dSEric Miao input_report_key(input_dev,
1594a83eecfSAnilKumar Ch keycodes[code],
160bab7614dSEric Miao new_state[col] & (1 << row));
161bab7614dSEric Miao }
162bab7614dSEric Miao }
163bab7614dSEric Miao input_sync(input_dev);
164bab7614dSEric Miao
165bab7614dSEric Miao memcpy(keypad->last_key_state, new_state, sizeof(new_state));
166bab7614dSEric Miao
167bab7614dSEric Miao activate_all_cols(pdata, true);
168bab7614dSEric Miao
169bab7614dSEric Miao /* Enable IRQs again */
170bab7614dSEric Miao spin_lock_irq(&keypad->lock);
171bab7614dSEric Miao keypad->scan_pending = false;
172bab7614dSEric Miao enable_row_irqs(keypad);
173bab7614dSEric Miao spin_unlock_irq(&keypad->lock);
174bab7614dSEric Miao }
175bab7614dSEric Miao
matrix_keypad_interrupt(int irq,void * id)176bab7614dSEric Miao static irqreturn_t matrix_keypad_interrupt(int irq, void *id)
177bab7614dSEric Miao {
178bab7614dSEric Miao struct matrix_keypad *keypad = id;
179bab7614dSEric Miao unsigned long flags;
180bab7614dSEric Miao
181bab7614dSEric Miao spin_lock_irqsave(&keypad->lock, flags);
182bab7614dSEric Miao
183bab7614dSEric Miao /*
184bab7614dSEric Miao * See if another IRQ beaten us to it and scheduled the
185bab7614dSEric Miao * scan already. In that case we should not try to
186bab7614dSEric Miao * disable IRQs again.
187bab7614dSEric Miao */
188bab7614dSEric Miao if (unlikely(keypad->scan_pending || keypad->stopped))
189bab7614dSEric Miao goto out;
190bab7614dSEric Miao
191bab7614dSEric Miao disable_row_irqs(keypad);
192bab7614dSEric Miao keypad->scan_pending = true;
193bab7614dSEric Miao schedule_delayed_work(&keypad->work,
194bab7614dSEric Miao msecs_to_jiffies(keypad->pdata->debounce_ms));
195bab7614dSEric Miao
196bab7614dSEric Miao out:
197bab7614dSEric Miao spin_unlock_irqrestore(&keypad->lock, flags);
198bab7614dSEric Miao return IRQ_HANDLED;
199bab7614dSEric Miao }
200bab7614dSEric Miao
matrix_keypad_start(struct input_dev * dev)201bab7614dSEric Miao static int matrix_keypad_start(struct input_dev *dev)
202bab7614dSEric Miao {
203bab7614dSEric Miao struct matrix_keypad *keypad = input_get_drvdata(dev);
204bab7614dSEric Miao
205bab7614dSEric Miao keypad->stopped = false;
206bab7614dSEric Miao mb();
207bab7614dSEric Miao
208bab7614dSEric Miao /*
209bab7614dSEric Miao * Schedule an immediate key scan to capture current key state;
210bab7614dSEric Miao * columns will be activated and IRQs be enabled after the scan.
211bab7614dSEric Miao */
212bab7614dSEric Miao schedule_delayed_work(&keypad->work, 0);
213bab7614dSEric Miao
214bab7614dSEric Miao return 0;
215bab7614dSEric Miao }
216bab7614dSEric Miao
matrix_keypad_stop(struct input_dev * dev)217bab7614dSEric Miao static void matrix_keypad_stop(struct input_dev *dev)
218bab7614dSEric Miao {
219bab7614dSEric Miao struct matrix_keypad *keypad = input_get_drvdata(dev);
220bab7614dSEric Miao
221ea4f7bd2SZhang Bo spin_lock_irq(&keypad->lock);
222bab7614dSEric Miao keypad->stopped = true;
223ea4f7bd2SZhang Bo spin_unlock_irq(&keypad->lock);
224ea4f7bd2SZhang Bo
225a342083aSDmitry Torokhov flush_delayed_work(&keypad->work);
226bab7614dSEric Miao /*
227bab7614dSEric Miao * matrix_keypad_scan() will leave IRQs enabled;
228bab7614dSEric Miao * we should disable them now.
229bab7614dSEric Miao */
230bab7614dSEric Miao disable_row_irqs(keypad);
231bab7614dSEric Miao }
232bab7614dSEric Miao
matrix_keypad_enable_wakeup(struct matrix_keypad * keypad)233fb76dd10SLuotao Fu static void matrix_keypad_enable_wakeup(struct matrix_keypad *keypad)
234bab7614dSEric Miao {
235bab7614dSEric Miao const struct matrix_keypad_platform_data *pdata = keypad->pdata;
236fb76dd10SLuotao Fu unsigned int gpio;
237bab7614dSEric Miao int i;
238bab7614dSEric Miao
239fb76dd10SLuotao Fu if (pdata->clustered_irq > 0) {
240fb76dd10SLuotao Fu if (enable_irq_wake(pdata->clustered_irq) == 0)
241fb76dd10SLuotao Fu keypad->gpio_all_disabled = true;
242fb76dd10SLuotao Fu } else {
243bab7614dSEric Miao
244dd219234SDmitry Torokhov for (i = 0; i < pdata->num_row_gpios; i++) {
245dd219234SDmitry Torokhov if (!test_bit(i, keypad->disabled_gpios)) {
246fb76dd10SLuotao Fu gpio = pdata->row_gpios[i];
247dd219234SDmitry Torokhov
248dd219234SDmitry Torokhov if (enable_irq_wake(gpio_to_irq(gpio)) == 0)
249dd219234SDmitry Torokhov __set_bit(i, keypad->disabled_gpios);
250dd219234SDmitry Torokhov }
251dd219234SDmitry Torokhov }
252dd219234SDmitry Torokhov }
253fb76dd10SLuotao Fu }
254fb76dd10SLuotao Fu
matrix_keypad_disable_wakeup(struct matrix_keypad * keypad)255fb76dd10SLuotao Fu static void matrix_keypad_disable_wakeup(struct matrix_keypad *keypad)
256fb76dd10SLuotao Fu {
257fb76dd10SLuotao Fu const struct matrix_keypad_platform_data *pdata = keypad->pdata;
258fb76dd10SLuotao Fu unsigned int gpio;
259fb76dd10SLuotao Fu int i;
260fb76dd10SLuotao Fu
261fb76dd10SLuotao Fu if (pdata->clustered_irq > 0) {
262fb76dd10SLuotao Fu if (keypad->gpio_all_disabled) {
263fb76dd10SLuotao Fu disable_irq_wake(pdata->clustered_irq);
264fb76dd10SLuotao Fu keypad->gpio_all_disabled = false;
265fb76dd10SLuotao Fu }
266fb76dd10SLuotao Fu } else {
267fb76dd10SLuotao Fu for (i = 0; i < pdata->num_row_gpios; i++) {
268fb76dd10SLuotao Fu if (test_and_clear_bit(i, keypad->disabled_gpios)) {
269fb76dd10SLuotao Fu gpio = pdata->row_gpios[i];
270fb76dd10SLuotao Fu disable_irq_wake(gpio_to_irq(gpio));
271fb76dd10SLuotao Fu }
272fb76dd10SLuotao Fu }
273fb76dd10SLuotao Fu }
274fb76dd10SLuotao Fu }
275fb76dd10SLuotao Fu
matrix_keypad_suspend(struct device * dev)276fb76dd10SLuotao Fu static int matrix_keypad_suspend(struct device *dev)
277fb76dd10SLuotao Fu {
278fb76dd10SLuotao Fu struct platform_device *pdev = to_platform_device(dev);
279fb76dd10SLuotao Fu struct matrix_keypad *keypad = platform_get_drvdata(pdev);
280fb76dd10SLuotao Fu
281fb76dd10SLuotao Fu matrix_keypad_stop(keypad->input_dev);
282fb76dd10SLuotao Fu
283fb76dd10SLuotao Fu if (device_may_wakeup(&pdev->dev))
284fb76dd10SLuotao Fu matrix_keypad_enable_wakeup(keypad);
285bab7614dSEric Miao
286bab7614dSEric Miao return 0;
287bab7614dSEric Miao }
288bab7614dSEric Miao
matrix_keypad_resume(struct device * dev)289f72a28abSDmitry Torokhov static int matrix_keypad_resume(struct device *dev)
290bab7614dSEric Miao {
291f72a28abSDmitry Torokhov struct platform_device *pdev = to_platform_device(dev);
292bab7614dSEric Miao struct matrix_keypad *keypad = platform_get_drvdata(pdev);
293bab7614dSEric Miao
294fb76dd10SLuotao Fu if (device_may_wakeup(&pdev->dev))
295fb76dd10SLuotao Fu matrix_keypad_disable_wakeup(keypad);
296bab7614dSEric Miao
297bab7614dSEric Miao matrix_keypad_start(keypad->input_dev);
298bab7614dSEric Miao
299bab7614dSEric Miao return 0;
300bab7614dSEric Miao }
301bab7614dSEric Miao
302b9425700SJonathan Cameron static DEFINE_SIMPLE_DEV_PM_OPS(matrix_keypad_pm_ops,
3030508c19aSDmitry Torokhov matrix_keypad_suspend, matrix_keypad_resume);
3040508c19aSDmitry Torokhov
matrix_keypad_init_gpio(struct platform_device * pdev,struct matrix_keypad * keypad)3055298cc4cSBill Pemberton static int matrix_keypad_init_gpio(struct platform_device *pdev,
306bab7614dSEric Miao struct matrix_keypad *keypad)
307bab7614dSEric Miao {
308bab7614dSEric Miao const struct matrix_keypad_platform_data *pdata = keypad->pdata;
309b83643ebSDmitry Torokhov int i, err;
310bab7614dSEric Miao
311bab7614dSEric Miao /* initialized strobe lines as outputs, activated */
312bab7614dSEric Miao for (i = 0; i < pdata->num_col_gpios; i++) {
313bab7614dSEric Miao err = gpio_request(pdata->col_gpios[i], "matrix_kbd_col");
314bab7614dSEric Miao if (err) {
315bab7614dSEric Miao dev_err(&pdev->dev,
316bab7614dSEric Miao "failed to request GPIO%d for COL%d\n",
317bab7614dSEric Miao pdata->col_gpios[i], i);
318bab7614dSEric Miao goto err_free_cols;
319bab7614dSEric Miao }
320bab7614dSEric Miao
321bab7614dSEric Miao gpio_direction_output(pdata->col_gpios[i], !pdata->active_low);
322bab7614dSEric Miao }
323bab7614dSEric Miao
324bab7614dSEric Miao for (i = 0; i < pdata->num_row_gpios; i++) {
325bab7614dSEric Miao err = gpio_request(pdata->row_gpios[i], "matrix_kbd_row");
326bab7614dSEric Miao if (err) {
327bab7614dSEric Miao dev_err(&pdev->dev,
328bab7614dSEric Miao "failed to request GPIO%d for ROW%d\n",
329bab7614dSEric Miao pdata->row_gpios[i], i);
330bab7614dSEric Miao goto err_free_rows;
331bab7614dSEric Miao }
332bab7614dSEric Miao
333bab7614dSEric Miao gpio_direction_input(pdata->row_gpios[i]);
334bab7614dSEric Miao }
335bab7614dSEric Miao
336fb76dd10SLuotao Fu if (pdata->clustered_irq > 0) {
33724e4d21cSLothar Waßmann err = request_any_context_irq(pdata->clustered_irq,
338fb76dd10SLuotao Fu matrix_keypad_interrupt,
339fb76dd10SLuotao Fu pdata->clustered_irq_flags,
340fb76dd10SLuotao Fu "matrix-keypad", keypad);
34124e4d21cSLothar Waßmann if (err < 0) {
342fb76dd10SLuotao Fu dev_err(&pdev->dev,
343fb76dd10SLuotao Fu "Unable to acquire clustered interrupt\n");
344fb76dd10SLuotao Fu goto err_free_rows;
345fb76dd10SLuotao Fu }
346fb76dd10SLuotao Fu } else {
347bab7614dSEric Miao for (i = 0; i < pdata->num_row_gpios; i++) {
34824e4d21cSLothar Waßmann err = request_any_context_irq(
34924e4d21cSLothar Waßmann gpio_to_irq(pdata->row_gpios[i]),
350bab7614dSEric Miao matrix_keypad_interrupt,
351fb76dd10SLuotao Fu IRQF_TRIGGER_RISING |
352fb76dd10SLuotao Fu IRQF_TRIGGER_FALLING,
353bab7614dSEric Miao "matrix-keypad", keypad);
35424e4d21cSLothar Waßmann if (err < 0) {
355bab7614dSEric Miao dev_err(&pdev->dev,
356b83643ebSDmitry Torokhov "Unable to acquire interrupt for GPIO line %i\n",
357bab7614dSEric Miao pdata->row_gpios[i]);
358bab7614dSEric Miao goto err_free_irqs;
359bab7614dSEric Miao }
360bab7614dSEric Miao }
361fb76dd10SLuotao Fu }
362bab7614dSEric Miao
363bab7614dSEric Miao /* initialized as disabled - enabled by input->open */
364bab7614dSEric Miao disable_row_irqs(keypad);
365bab7614dSEric Miao return 0;
366bab7614dSEric Miao
367bab7614dSEric Miao err_free_irqs:
368bab7614dSEric Miao while (--i >= 0)
369bab7614dSEric Miao free_irq(gpio_to_irq(pdata->row_gpios[i]), keypad);
370bab7614dSEric Miao i = pdata->num_row_gpios;
371bab7614dSEric Miao err_free_rows:
372bab7614dSEric Miao while (--i >= 0)
373bab7614dSEric Miao gpio_free(pdata->row_gpios[i]);
374bab7614dSEric Miao i = pdata->num_col_gpios;
375bab7614dSEric Miao err_free_cols:
376bab7614dSEric Miao while (--i >= 0)
377bab7614dSEric Miao gpio_free(pdata->col_gpios[i]);
378bab7614dSEric Miao
379bab7614dSEric Miao return err;
380bab7614dSEric Miao }
381bab7614dSEric Miao
matrix_keypad_free_gpio(struct matrix_keypad * keypad)382b83643ebSDmitry Torokhov static void matrix_keypad_free_gpio(struct matrix_keypad *keypad)
383b83643ebSDmitry Torokhov {
384b83643ebSDmitry Torokhov const struct matrix_keypad_platform_data *pdata = keypad->pdata;
385b83643ebSDmitry Torokhov int i;
386b83643ebSDmitry Torokhov
387b83643ebSDmitry Torokhov if (pdata->clustered_irq > 0) {
388b83643ebSDmitry Torokhov free_irq(pdata->clustered_irq, keypad);
389b83643ebSDmitry Torokhov } else {
390b83643ebSDmitry Torokhov for (i = 0; i < pdata->num_row_gpios; i++)
391b83643ebSDmitry Torokhov free_irq(gpio_to_irq(pdata->row_gpios[i]), keypad);
392b83643ebSDmitry Torokhov }
393b83643ebSDmitry Torokhov
394b83643ebSDmitry Torokhov for (i = 0; i < pdata->num_row_gpios; i++)
395b83643ebSDmitry Torokhov gpio_free(pdata->row_gpios[i]);
396b83643ebSDmitry Torokhov
397b83643ebSDmitry Torokhov for (i = 0; i < pdata->num_col_gpios; i++)
398b83643ebSDmitry Torokhov gpio_free(pdata->col_gpios[i]);
399b83643ebSDmitry Torokhov }
400b83643ebSDmitry Torokhov
4014a83eecfSAnilKumar Ch #ifdef CONFIG_OF
4025298cc4cSBill Pemberton static struct matrix_keypad_platform_data *
matrix_keypad_parse_dt(struct device * dev)4034a83eecfSAnilKumar Ch matrix_keypad_parse_dt(struct device *dev)
4044a83eecfSAnilKumar Ch {
4054a83eecfSAnilKumar Ch struct matrix_keypad_platform_data *pdata;
4064a83eecfSAnilKumar Ch struct device_node *np = dev->of_node;
4074a83eecfSAnilKumar Ch unsigned int *gpios;
408d55bda1bSChristian Hoff int ret, i, nrow, ncol;
4094a83eecfSAnilKumar Ch
4104a83eecfSAnilKumar Ch if (!np) {
4114a83eecfSAnilKumar Ch dev_err(dev, "device lacks DT data\n");
4124a83eecfSAnilKumar Ch return ERR_PTR(-ENODEV);
4134a83eecfSAnilKumar Ch }
4144a83eecfSAnilKumar Ch
4154a83eecfSAnilKumar Ch pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
4164a83eecfSAnilKumar Ch if (!pdata) {
4174a83eecfSAnilKumar Ch dev_err(dev, "could not allocate memory for platform data\n");
4184a83eecfSAnilKumar Ch return ERR_PTR(-ENOMEM);
4194a83eecfSAnilKumar Ch }
4204a83eecfSAnilKumar Ch
421f8f7f47dSAndy Shevchenko pdata->num_row_gpios = nrow = gpiod_count(dev, "row");
422f8f7f47dSAndy Shevchenko pdata->num_col_gpios = ncol = gpiod_count(dev, "col");
423f8f7f47dSAndy Shevchenko if (nrow < 0 || ncol < 0) {
4244a83eecfSAnilKumar Ch dev_err(dev, "number of keypad rows/columns not specified\n");
4254a83eecfSAnilKumar Ch return ERR_PTR(-EINVAL);
4264a83eecfSAnilKumar Ch }
4274a83eecfSAnilKumar Ch
428*12c7d0aeSRob Herring pdata->no_autorepeat = of_property_read_bool(np, "linux,no-autorepeat");
429aeda5003SDmitry Torokhov
430aeda5003SDmitry Torokhov pdata->wakeup = of_property_read_bool(np, "wakeup-source") ||
431aeda5003SDmitry Torokhov of_property_read_bool(np, "linux,wakeup"); /* legacy */
432aeda5003SDmitry Torokhov
433*12c7d0aeSRob Herring pdata->active_low = of_property_read_bool(np, "gpio-activelow");
4344a83eecfSAnilKumar Ch
435aa0e26bbSDavid Rivshin pdata->drive_inactive_cols =
436aa0e26bbSDavid Rivshin of_property_read_bool(np, "drive-inactive-cols");
437aa0e26bbSDavid Rivshin
4384a83eecfSAnilKumar Ch of_property_read_u32(np, "debounce-delay-ms", &pdata->debounce_ms);
4394a83eecfSAnilKumar Ch of_property_read_u32(np, "col-scan-delay-us",
4404a83eecfSAnilKumar Ch &pdata->col_scan_delay_us);
4414a83eecfSAnilKumar Ch
442a86854d0SKees Cook gpios = devm_kcalloc(dev,
443a86854d0SKees Cook pdata->num_row_gpios + pdata->num_col_gpios,
444a86854d0SKees Cook sizeof(unsigned int),
4454a83eecfSAnilKumar Ch GFP_KERNEL);
4464a83eecfSAnilKumar Ch if (!gpios) {
4474a83eecfSAnilKumar Ch dev_err(dev, "could not allocate memory for gpios\n");
4484a83eecfSAnilKumar Ch return ERR_PTR(-ENOMEM);
4494a83eecfSAnilKumar Ch }
4504a83eecfSAnilKumar Ch
451d55bda1bSChristian Hoff for (i = 0; i < nrow; i++) {
452d55bda1bSChristian Hoff ret = of_get_named_gpio(np, "row-gpios", i);
453d55bda1bSChristian Hoff if (ret < 0)
454d55bda1bSChristian Hoff return ERR_PTR(ret);
455d55bda1bSChristian Hoff gpios[i] = ret;
456d55bda1bSChristian Hoff }
4574a83eecfSAnilKumar Ch
458d55bda1bSChristian Hoff for (i = 0; i < ncol; i++) {
459d55bda1bSChristian Hoff ret = of_get_named_gpio(np, "col-gpios", i);
460d55bda1bSChristian Hoff if (ret < 0)
461d55bda1bSChristian Hoff return ERR_PTR(ret);
462d55bda1bSChristian Hoff gpios[nrow + i] = ret;
463d55bda1bSChristian Hoff }
4644a83eecfSAnilKumar Ch
4654a83eecfSAnilKumar Ch pdata->row_gpios = gpios;
4664a83eecfSAnilKumar Ch pdata->col_gpios = &gpios[pdata->num_row_gpios];
4674a83eecfSAnilKumar Ch
4684a83eecfSAnilKumar Ch return pdata;
4694a83eecfSAnilKumar Ch }
4704a83eecfSAnilKumar Ch #else
4714a83eecfSAnilKumar Ch static inline struct matrix_keypad_platform_data *
matrix_keypad_parse_dt(struct device * dev)4724a83eecfSAnilKumar Ch matrix_keypad_parse_dt(struct device *dev)
4734a83eecfSAnilKumar Ch {
4744a83eecfSAnilKumar Ch dev_err(dev, "no platform data defined\n");
4754a83eecfSAnilKumar Ch
4764a83eecfSAnilKumar Ch return ERR_PTR(-EINVAL);
4774a83eecfSAnilKumar Ch }
4784a83eecfSAnilKumar Ch #endif
4794a83eecfSAnilKumar Ch
matrix_keypad_probe(struct platform_device * pdev)4805298cc4cSBill Pemberton static int matrix_keypad_probe(struct platform_device *pdev)
481bab7614dSEric Miao {
482bab7614dSEric Miao const struct matrix_keypad_platform_data *pdata;
483bab7614dSEric Miao struct matrix_keypad *keypad;
484bab7614dSEric Miao struct input_dev *input_dev;
485bab7614dSEric Miao int err;
486bab7614dSEric Miao
4874a83eecfSAnilKumar Ch pdata = dev_get_platdata(&pdev->dev);
488bab7614dSEric Miao if (!pdata) {
4894a83eecfSAnilKumar Ch pdata = matrix_keypad_parse_dt(&pdev->dev);
490d55bda1bSChristian Hoff if (IS_ERR(pdata))
4914a83eecfSAnilKumar Ch return PTR_ERR(pdata);
4924a83eecfSAnilKumar Ch } else if (!pdata->keymap_data) {
493bab7614dSEric Miao dev_err(&pdev->dev, "no keymap data defined\n");
494bab7614dSEric Miao return -EINVAL;
495bab7614dSEric Miao }
496bab7614dSEric Miao
4974a83eecfSAnilKumar Ch keypad = kzalloc(sizeof(struct matrix_keypad), GFP_KERNEL);
498bab7614dSEric Miao input_dev = input_allocate_device();
49901111fcdSDmitry Torokhov if (!keypad || !input_dev) {
500bab7614dSEric Miao err = -ENOMEM;
501bab7614dSEric Miao goto err_free_mem;
502bab7614dSEric Miao }
503bab7614dSEric Miao
504bab7614dSEric Miao keypad->input_dev = input_dev;
505bab7614dSEric Miao keypad->pdata = pdata;
5064a83eecfSAnilKumar Ch keypad->row_shift = get_count_order(pdata->num_col_gpios);
507bab7614dSEric Miao keypad->stopped = true;
508bab7614dSEric Miao INIT_DELAYED_WORK(&keypad->work, matrix_keypad_scan);
509bab7614dSEric Miao spin_lock_init(&keypad->lock);
510bab7614dSEric Miao
511bab7614dSEric Miao input_dev->name = pdev->name;
512bab7614dSEric Miao input_dev->id.bustype = BUS_HOST;
513bab7614dSEric Miao input_dev->dev.parent = &pdev->dev;
514bab7614dSEric Miao input_dev->open = matrix_keypad_start;
515bab7614dSEric Miao input_dev->close = matrix_keypad_stop;
516bab7614dSEric Miao
5174a83eecfSAnilKumar Ch err = matrix_keypad_build_keymap(pdata->keymap_data, NULL,
5181932811fSDmitry Torokhov pdata->num_row_gpios,
5191932811fSDmitry Torokhov pdata->num_col_gpios,
5204a83eecfSAnilKumar Ch NULL, input_dev);
5214a83eecfSAnilKumar Ch if (err) {
5224a83eecfSAnilKumar Ch dev_err(&pdev->dev, "failed to build keymap\n");
5231932811fSDmitry Torokhov goto err_free_mem;
5244a83eecfSAnilKumar Ch }
525bab7614dSEric Miao
5261932811fSDmitry Torokhov if (!pdata->no_autorepeat)
5271932811fSDmitry Torokhov __set_bit(EV_REP, input_dev->evbit);
528bab7614dSEric Miao input_set_capability(input_dev, EV_MSC, MSC_SCAN);
529bab7614dSEric Miao input_set_drvdata(input_dev, keypad);
530bab7614dSEric Miao
531b83643ebSDmitry Torokhov err = matrix_keypad_init_gpio(pdev, keypad);
532bab7614dSEric Miao if (err)
533bab7614dSEric Miao goto err_free_mem;
534bab7614dSEric Miao
535bab7614dSEric Miao err = input_register_device(keypad->input_dev);
536bab7614dSEric Miao if (err)
537b83643ebSDmitry Torokhov goto err_free_gpio;
538bab7614dSEric Miao
539bab7614dSEric Miao device_init_wakeup(&pdev->dev, pdata->wakeup);
540bab7614dSEric Miao platform_set_drvdata(pdev, keypad);
541bab7614dSEric Miao
542bab7614dSEric Miao return 0;
543bab7614dSEric Miao
544b83643ebSDmitry Torokhov err_free_gpio:
545b83643ebSDmitry Torokhov matrix_keypad_free_gpio(keypad);
546bab7614dSEric Miao err_free_mem:
547bab7614dSEric Miao input_free_device(input_dev);
548bab7614dSEric Miao kfree(keypad);
549bab7614dSEric Miao return err;
550bab7614dSEric Miao }
551bab7614dSEric Miao
matrix_keypad_remove(struct platform_device * pdev)552e2619cf7SBill Pemberton static int matrix_keypad_remove(struct platform_device *pdev)
553bab7614dSEric Miao {
554bab7614dSEric Miao struct matrix_keypad *keypad = platform_get_drvdata(pdev);
555bab7614dSEric Miao
556b83643ebSDmitry Torokhov matrix_keypad_free_gpio(keypad);
557bab7614dSEric Miao input_unregister_device(keypad->input_dev);
558bab7614dSEric Miao kfree(keypad);
559bab7614dSEric Miao
560bab7614dSEric Miao return 0;
561bab7614dSEric Miao }
562bab7614dSEric Miao
5634a83eecfSAnilKumar Ch #ifdef CONFIG_OF
5644a83eecfSAnilKumar Ch static const struct of_device_id matrix_keypad_dt_match[] = {
5654a83eecfSAnilKumar Ch { .compatible = "gpio-matrix-keypad" },
5664a83eecfSAnilKumar Ch { }
5674a83eecfSAnilKumar Ch };
5684a83eecfSAnilKumar Ch MODULE_DEVICE_TABLE(of, matrix_keypad_dt_match);
5694a83eecfSAnilKumar Ch #endif
5704a83eecfSAnilKumar Ch
571bab7614dSEric Miao static struct platform_driver matrix_keypad_driver = {
572bab7614dSEric Miao .probe = matrix_keypad_probe,
5731cb0aa88SBill Pemberton .remove = matrix_keypad_remove,
574bab7614dSEric Miao .driver = {
575bab7614dSEric Miao .name = "matrix-keypad",
576b9425700SJonathan Cameron .pm = pm_sleep_ptr(&matrix_keypad_pm_ops),
5774a83eecfSAnilKumar Ch .of_match_table = of_match_ptr(matrix_keypad_dt_match),
578bab7614dSEric Miao },
579bab7614dSEric Miao };
5805146c84fSJJ Ding module_platform_driver(matrix_keypad_driver);
581bab7614dSEric Miao
582bab7614dSEric Miao MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
583bab7614dSEric Miao MODULE_DESCRIPTION("GPIO Driven Matrix Keypad Driver");
584bab7614dSEric Miao MODULE_LICENSE("GPL v2");
585bab7614dSEric Miao MODULE_ALIAS("platform:matrix-keypad");
586