1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * Samsung keypad driver
24 #include <linux/input/samsung-keypad.h>
78 static void samsung_keypad_scan(struct samsung_keypad *keypad,  in samsung_keypad_scan()  argument
84 	for (col = 0; col < keypad->cols; col++) {  in samsung_keypad_scan()
86 		val <<= keypad->chip->column_shift;  in samsung_keypad_scan()
88 		writel(val, keypad->base + SAMSUNG_KEYIFCOL);  in samsung_keypad_scan()
91 		val = readl(keypad->base + SAMSUNG_KEYIFROW);  in samsung_keypad_scan()
92 		row_state[col] = ~val & GENMASK(keypad->rows - 1, 0);  in samsung_keypad_scan()
96 	writel(0, keypad->base + SAMSUNG_KEYIFCOL);  in samsung_keypad_scan()
99 static bool samsung_keypad_report(struct samsung_keypad *keypad,  in samsung_keypad_report()  argument
102 	struct input_dev *input_dev = keypad->input_dev;  in samsung_keypad_report()
109 	for (col = 0; col < keypad->cols; col++) {  in samsung_keypad_report()
110 		changed = row_state[col] ^ keypad->row_state[col];  in samsung_keypad_report()
115 		for (row = 0; row < keypad->rows; row++) {  in samsung_keypad_report()
121 			dev_dbg(&keypad->input_dev->dev,  in samsung_keypad_report()
125 			val = MATRIX_SCAN_CODE(row, col, keypad->row_shift);  in samsung_keypad_report()
129 					keypad->keycodes[val], pressed);  in samsung_keypad_report()
131 		input_sync(keypad->input_dev);  in samsung_keypad_report()
134 	memcpy(keypad->row_state, row_state, sizeof(keypad->row_state));  in samsung_keypad_report()
141 	struct samsung_keypad *keypad = dev_id;  in samsung_keypad_irq()  local
145 	pm_runtime_get_sync(&keypad->pdev->dev);  in samsung_keypad_irq()
148 		readl(keypad->base + SAMSUNG_KEYIFSTSCLR);  in samsung_keypad_irq()
150 		writel(~0x0, keypad->base + SAMSUNG_KEYIFSTSCLR);  in samsung_keypad_irq()
152 		samsung_keypad_scan(keypad, row_state);  in samsung_keypad_irq()
154 		key_down = samsung_keypad_report(keypad, row_state);  in samsung_keypad_irq()
156 			wait_event_timeout(keypad->wait, keypad->stopped,  in samsung_keypad_irq()
159 	} while (key_down && !keypad->stopped);  in samsung_keypad_irq()
161 	pm_runtime_put(&keypad->pdev->dev);  in samsung_keypad_irq()
166 static void samsung_keypad_start(struct samsung_keypad *keypad)  in samsung_keypad_start()  argument
170 	pm_runtime_get_sync(&keypad->pdev->dev);  in samsung_keypad_start()
173 	keypad->stopped = false;  in samsung_keypad_start()
175 	clk_enable(keypad->clk);  in samsung_keypad_start()
178 	val = readl(keypad->base + SAMSUNG_KEYIFCON);  in samsung_keypad_start()
180 	writel(val, keypad->base + SAMSUNG_KEYIFCON);  in samsung_keypad_start()
183 	writel(0, keypad->base + SAMSUNG_KEYIFCOL);  in samsung_keypad_start()
185 	pm_runtime_put(&keypad->pdev->dev);  in samsung_keypad_start()
188 static void samsung_keypad_stop(struct samsung_keypad *keypad)  in samsung_keypad_stop()  argument
192 	pm_runtime_get_sync(&keypad->pdev->dev);  in samsung_keypad_stop()
195 	keypad->stopped = true;  in samsung_keypad_stop()
196 	wake_up(&keypad->wait);  in samsung_keypad_stop()
197 	disable_irq(keypad->irq);  in samsung_keypad_stop()
200 	writel(~0x0, keypad->base + SAMSUNG_KEYIFSTSCLR);  in samsung_keypad_stop()
203 	val = readl(keypad->base + SAMSUNG_KEYIFCON);  in samsung_keypad_stop()
205 	writel(val, keypad->base + SAMSUNG_KEYIFCON);  in samsung_keypad_stop()
207 	clk_disable(keypad->clk);  in samsung_keypad_stop()
211 	 * re-enable the handler.  in samsung_keypad_stop()
213 	enable_irq(keypad->irq);  in samsung_keypad_stop()
215 	pm_runtime_put(&keypad->pdev->dev);  in samsung_keypad_stop()
220 	struct samsung_keypad *keypad = input_get_drvdata(input_dev);  in samsung_keypad_open()  local
222 	samsung_keypad_start(keypad);  in samsung_keypad_open()
229 	struct samsung_keypad *keypad = input_get_drvdata(input_dev);  in samsung_keypad_close()  local
231 	samsung_keypad_stop(keypad);  in samsung_keypad_close()
241 	struct device_node *np = dev->of_node, *key_np;  in samsung_keypad_parse_dt()
246 		return ERR_PTR(-EINVAL);  in samsung_keypad_parse_dt()
252 		return ERR_PTR(-ENOMEM);  in samsung_keypad_parse_dt()
255 	of_property_read_u32(np, "samsung,keypad-num-rows", &num_rows);  in samsung_keypad_parse_dt()
256 	of_property_read_u32(np, "samsung,keypad-num-columns", &num_cols);  in samsung_keypad_parse_dt()
258 		dev_err(dev, "number of keypad rows/columns not specified\n");  in samsung_keypad_parse_dt()
259 		return ERR_PTR(-EINVAL);  in samsung_keypad_parse_dt()
261 	pdata->rows = num_rows;  in samsung_keypad_parse_dt()
262 	pdata->cols = num_cols;  in samsung_keypad_parse_dt()
267 		return ERR_PTR(-ENOMEM);  in samsung_keypad_parse_dt()
269 	pdata->keymap_data = keymap_data;  in samsung_keypad_parse_dt()
272 	keymap_data->keymap_size = key_count;  in samsung_keypad_parse_dt()
276 		return ERR_PTR(-ENOMEM);  in samsung_keypad_parse_dt()
278 	keymap_data->keymap = keymap;  in samsung_keypad_parse_dt()
282 		of_property_read_u32(key_np, "keypad,row", &row);  in samsung_keypad_parse_dt()
283 		of_property_read_u32(key_np, "keypad,column", &col);  in samsung_keypad_parse_dt()
288 	pdata->no_autorepeat = of_property_read_bool(np, "linux,input-no-autorepeat");  in samsung_keypad_parse_dt()
290 	pdata->wakeup = of_property_read_bool(np, "wakeup-source") ||  in samsung_keypad_parse_dt()
292 			of_property_read_bool(np, "linux,input-wakeup");  in samsung_keypad_parse_dt()
303 	return ERR_PTR(-EINVAL);  in samsung_keypad_parse_dt()
312 	struct samsung_keypad *keypad;  in samsung_keypad_probe()  local
318 	pdata = dev_get_platdata(&pdev->dev);  in samsung_keypad_probe()
320 		pdata = samsung_keypad_parse_dt(&pdev->dev);  in samsung_keypad_probe()
325 	keymap_data = pdata->keymap_data;  in samsung_keypad_probe()
327 		dev_err(&pdev->dev, "no keymap data defined\n");  in samsung_keypad_probe()
328 		return -EINVAL;  in samsung_keypad_probe()
331 	if (!pdata->rows || pdata->rows > SAMSUNG_MAX_ROWS)  in samsung_keypad_probe()
332 		return -EINVAL;  in samsung_keypad_probe()
334 	if (!pdata->cols || pdata->cols > SAMSUNG_MAX_COLS)  in samsung_keypad_probe()
335 		return -EINVAL;  in samsung_keypad_probe()
338 	if (pdata->cfg_gpio)  in samsung_keypad_probe()
339 		pdata->cfg_gpio(pdata->rows, pdata->cols);  in samsung_keypad_probe()
341 	row_shift = get_count_order(pdata->cols);  in samsung_keypad_probe()
343 	keypad = devm_kzalloc(&pdev->dev,  in samsung_keypad_probe()
344 			      struct_size(keypad, keycodes,  in samsung_keypad_probe()
345 					  pdata->rows << row_shift),  in samsung_keypad_probe()
347 	if (!keypad)  in samsung_keypad_probe()
348 		return -ENOMEM;  in samsung_keypad_probe()
350 	input_dev = devm_input_allocate_device(&pdev->dev);  in samsung_keypad_probe()
352 		return -ENOMEM;  in samsung_keypad_probe()
356 		return -ENODEV;  in samsung_keypad_probe()
358 	keypad->base = devm_ioremap(&pdev->dev, res->start, resource_size(res));  in samsung_keypad_probe()
359 	if (!keypad->base)  in samsung_keypad_probe()
360 		return -EBUSY;  in samsung_keypad_probe()
362 	keypad->clk = devm_clk_get_prepared(&pdev->dev, "keypad");  in samsung_keypad_probe()
363 	if (IS_ERR(keypad->clk)) {  in samsung_keypad_probe()
364 		dev_err(&pdev->dev, "failed to get keypad clk\n");  in samsung_keypad_probe()
365 		return PTR_ERR(keypad->clk);  in samsung_keypad_probe()
368 	keypad->input_dev = input_dev;  in samsung_keypad_probe()
369 	keypad->pdev = pdev;  in samsung_keypad_probe()
370 	keypad->row_shift = row_shift;  in samsung_keypad_probe()
371 	keypad->rows = pdata->rows;  in samsung_keypad_probe()
372 	keypad->cols = pdata->cols;  in samsung_keypad_probe()
373 	keypad->stopped = true;  in samsung_keypad_probe()
374 	init_waitqueue_head(&keypad->wait);  in samsung_keypad_probe()
376 	keypad->chip = device_get_match_data(&pdev->dev);  in samsung_keypad_probe()
377 	if (!keypad->chip) {  in samsung_keypad_probe()
380 			keypad->chip = (const void *)id->driver_data;  in samsung_keypad_probe()
383 	if (!keypad->chip) {  in samsung_keypad_probe()
384 		dev_err(&pdev->dev, "Unable to determine chip type");  in samsung_keypad_probe()
385 		return -EINVAL;  in samsung_keypad_probe()
388 	input_dev->name = pdev->name;  in samsung_keypad_probe()
389 	input_dev->id.bustype = BUS_HOST;  in samsung_keypad_probe()
391 	input_dev->open = samsung_keypad_open;  in samsung_keypad_probe()
392 	input_dev->close = samsung_keypad_close;  in samsung_keypad_probe()
395 					   pdata->rows, pdata->cols,  in samsung_keypad_probe()
396 					   keypad->keycodes, input_dev);  in samsung_keypad_probe()
398 		dev_err(&pdev->dev, "failed to build keymap\n");  in samsung_keypad_probe()
403 	if (!pdata->no_autorepeat)  in samsung_keypad_probe()
404 		__set_bit(EV_REP, input_dev->evbit);  in samsung_keypad_probe()
406 	input_set_drvdata(input_dev, keypad);  in samsung_keypad_probe()
408 	keypad->irq = platform_get_irq(pdev, 0);  in samsung_keypad_probe()
409 	if (keypad->irq < 0) {  in samsung_keypad_probe()
410 		error = keypad->irq;  in samsung_keypad_probe()
414 	error = devm_request_threaded_irq(&pdev->dev, keypad->irq, NULL,  in samsung_keypad_probe()
416 					  dev_name(&pdev->dev), keypad);  in samsung_keypad_probe()
418 		dev_err(&pdev->dev, "failed to register keypad interrupt\n");  in samsung_keypad_probe()
422 	device_init_wakeup(&pdev->dev, pdata->wakeup);  in samsung_keypad_probe()
423 	platform_set_drvdata(pdev, keypad);  in samsung_keypad_probe()
425 	error = devm_pm_runtime_enable(&pdev->dev);  in samsung_keypad_probe()
429 	error = input_register_device(keypad->input_dev);  in samsung_keypad_probe()
433 	if (pdev->dev.of_node) {  in samsung_keypad_probe()
434 		devm_kfree(&pdev->dev, (void *)pdata->keymap_data->keymap);  in samsung_keypad_probe()
435 		devm_kfree(&pdev->dev, (void *)pdata->keymap_data);  in samsung_keypad_probe()
436 		devm_kfree(&pdev->dev, (void *)pdata);  in samsung_keypad_probe()
444 	struct samsung_keypad *keypad = platform_get_drvdata(pdev);  in samsung_keypad_runtime_suspend()  local
448 	if (keypad->stopped)  in samsung_keypad_runtime_suspend()
452 	error = enable_irq_wake(keypad->irq);  in samsung_keypad_runtime_suspend()
454 		keypad->wake_enabled = true;  in samsung_keypad_runtime_suspend()
456 	val = readl(keypad->base + SAMSUNG_KEYIFCON);  in samsung_keypad_runtime_suspend()
458 	writel(val, keypad->base + SAMSUNG_KEYIFCON);  in samsung_keypad_runtime_suspend()
460 	clk_disable(keypad->clk);  in samsung_keypad_runtime_suspend()
468 	struct samsung_keypad *keypad = platform_get_drvdata(pdev);  in samsung_keypad_runtime_resume()  local
471 	if (keypad->stopped)  in samsung_keypad_runtime_resume()
474 	clk_enable(keypad->clk);  in samsung_keypad_runtime_resume()
476 	val = readl(keypad->base + SAMSUNG_KEYIFCON);  in samsung_keypad_runtime_resume()
478 	writel(val, keypad->base + SAMSUNG_KEYIFCON);  in samsung_keypad_runtime_resume()
480 	if (keypad->wake_enabled)  in samsung_keypad_runtime_resume()
481 		disable_irq_wake(keypad->irq);  in samsung_keypad_runtime_resume()
486 static void samsung_keypad_toggle_wakeup(struct samsung_keypad *keypad,  in samsung_keypad_toggle_wakeup()  argument
491 	clk_enable(keypad->clk);  in samsung_keypad_toggle_wakeup()
493 	val = readl(keypad->base + SAMSUNG_KEYIFCON);  in samsung_keypad_toggle_wakeup()
496 		if (device_may_wakeup(&keypad->pdev->dev))  in samsung_keypad_toggle_wakeup()
497 			enable_irq_wake(keypad->irq);  in samsung_keypad_toggle_wakeup()
500 		if (device_may_wakeup(&keypad->pdev->dev))  in samsung_keypad_toggle_wakeup()
501 			disable_irq_wake(keypad->irq);  in samsung_keypad_toggle_wakeup()
503 	writel(val, keypad->base + SAMSUNG_KEYIFCON);  in samsung_keypad_toggle_wakeup()
505 	clk_disable(keypad->clk);  in samsung_keypad_toggle_wakeup()
511 	struct samsung_keypad *keypad = platform_get_drvdata(pdev);  in samsung_keypad_suspend()  local
512 	struct input_dev *input_dev = keypad->input_dev;  in samsung_keypad_suspend()
514 	guard(mutex)(&input_dev->mutex);  in samsung_keypad_suspend()
517 		samsung_keypad_stop(keypad);  in samsung_keypad_suspend()
519 	samsung_keypad_toggle_wakeup(keypad, true);  in samsung_keypad_suspend()
527 	struct samsung_keypad *keypad = platform_get_drvdata(pdev);  in samsung_keypad_resume()  local
528 	struct input_dev *input_dev = keypad->input_dev;  in samsung_keypad_resume()
530 	guard(mutex)(&input_dev->mutex);  in samsung_keypad_resume()
532 	samsung_keypad_toggle_wakeup(keypad, false);  in samsung_keypad_resume()
535 		samsung_keypad_start(keypad);  in samsung_keypad_resume()
557 		.compatible = "samsung,s3c6410-keypad",
560 		.compatible = "samsung,s5pv210-keypad",
570 		.name		= "samsung-keypad",
573 		.name		= "s5pv210-keypad",
583 		.name	= "samsung-keypad",
591 MODULE_DESCRIPTION("Samsung keypad driver");