1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * twl4030_keypad.c - driver for 8x8 keypad controller in twl4030 chips
8  * Code re-written for 2430SDP by:
27  * events, since it uses only the always-on 32KiHz oscillator, and has
29  * multi-key combinations.
50 	bool		autorepeat;  member
59 /*----------------------------------------------------------------------*/
100 #define KEYP_PERIOD_US(t, prescale)	((t) / (31 << ((prescale) + 1)) - 1)
123 /*----------------------------------------------------------------------*/
131 		dev_warn(kp->dbg_dev,  in twl4030_kpread()
132 			"Couldn't read TWL4030: %X - ret %d[%x]\n",  in twl4030_kpread()
143 		dev_warn(kp->dbg_dev,  in twl4030_kpwrite_u8()
144 			"Could not write TWL4030: %X - ret %d[%x]\n",  in twl4030_kpwrite_u8()
159 		return 1 << kp->n_cols;  in twl4030_col_xlate()
161 		return col & ((1 << kp->n_cols) - 1);  in twl4030_col_xlate()
169 				 KEYP_FULL_CODE_7_0, kp->n_rows);  in twl4030_read_kp_matrix_state()
171 		for (row = 0; row < kp->n_rows; row++)  in twl4030_read_kp_matrix_state()
182 	for (i = 0; i < kp->n_rows; i++) {  in twl4030_is_in_ghost_state()
196 	struct input_dev *input = kp->input;  in twl4030_kp_scan()
214 	for (row = 0; row < kp->n_rows; row++) {  in twl4030_kp_scan()
215 		int changed = new_state[row] ^ kp->kp_state[row];  in twl4030_kp_scan()
221 		for (col = 0; col < kp->n_cols + 1; col++) {  in twl4030_kp_scan()
227 			dev_dbg(kp->dbg_dev, "key [%d:%d] %s\n", row, col,  in twl4030_kp_scan()
233 			input_report_key(input, kp->keymap[code],  in twl4030_kp_scan()
236 		kp->kp_state[row] = new_state[row];  in twl4030_kp_scan()
270 	/* Enable controller, with hardware decoding but not autorepeat */  in twl4030_kp_program()
274 		return -EIO;  in twl4030_kp_program()
284 		return -EIO;  in twl4030_kp_program()
289 		return -EIO;  in twl4030_kp_program()
294 		return -EIO;  in twl4030_kp_program()
299 		return -EIO;  in twl4030_kp_program()
302 		return -EIO;  in twl4030_kp_program()
305 	 * Enable Clear-on-Read; disable remembering events that fire  in twl4030_kp_program()
310 		return -EIO;  in twl4030_kp_program()
313 	if (twl4030_read_kp_matrix_state(kp, kp->kp_state) < 0)  in twl4030_kp_program()
314 		return -EIO;  in twl4030_kp_program()
325 	struct twl4030_keypad_data *pdata = dev_get_platdata(&pdev->dev);  in twl4030_kp_probe()
332 	kp = devm_kzalloc(&pdev->dev, sizeof(*kp), GFP_KERNEL);  in twl4030_kp_probe()
334 		return -ENOMEM;  in twl4030_kp_probe()
336 	input = devm_input_allocate_device(&pdev->dev);  in twl4030_kp_probe()
338 		return -ENOMEM;  in twl4030_kp_probe()
341 	kp->dbg_dev		= &pdev->dev;  in twl4030_kp_probe()
342 	kp->input		= input;  in twl4030_kp_probe()
345 	input->name		= "TWL4030 Keypad";  in twl4030_kp_probe()
346 	input->phys		= "twl4030_keypad/input0";  in twl4030_kp_probe()
348 	input->id.bustype	= BUS_HOST;  in twl4030_kp_probe()
349 	input->id.vendor	= 0x0001;  in twl4030_kp_probe()
350 	input->id.product	= 0x0001;  in twl4030_kp_probe()
351 	input->id.version	= 0x0003;  in twl4030_kp_probe()
354 		if (!pdata->rows || !pdata->cols || !pdata->keymap_data) {  in twl4030_kp_probe()
355 			dev_err(&pdev->dev, "Missing platform_data\n");  in twl4030_kp_probe()
356 			return -EINVAL;  in twl4030_kp_probe()
359 		kp->n_rows = pdata->rows;  in twl4030_kp_probe()
360 		kp->n_cols = pdata->cols;  in twl4030_kp_probe()
361 		kp->autorepeat = pdata->rep;  in twl4030_kp_probe()
362 		keymap_data = pdata->keymap_data;  in twl4030_kp_probe()
364 		error = matrix_keypad_parse_properties(&pdev->dev, &kp->n_rows,  in twl4030_kp_probe()
365 						       &kp->n_cols);  in twl4030_kp_probe()
369 		kp->autorepeat = true;  in twl4030_kp_probe()
372 	if (kp->n_rows > TWL4030_MAX_ROWS || kp->n_cols > TWL4030_MAX_COLS) {  in twl4030_kp_probe()
373 		dev_err(&pdev->dev,  in twl4030_kp_probe()
375 		return -EINVAL;  in twl4030_kp_probe()
378 	kp->irq = platform_get_irq(pdev, 0);  in twl4030_kp_probe()
379 	if (kp->irq < 0)  in twl4030_kp_probe()
380 		return kp->irq;  in twl4030_kp_probe()
385 					   kp->keymap, input);  in twl4030_kp_probe()
387 		dev_err(kp->dbg_dev, "Failed to build keymap\n");  in twl4030_kp_probe()
393 	if (kp->autorepeat)  in twl4030_kp_probe()
394 		__set_bit(EV_REP, input->evbit);  in twl4030_kp_probe()
398 		dev_err(kp->dbg_dev,  in twl4030_kp_probe()
413 	error = devm_request_threaded_irq(&pdev->dev, kp->irq, NULL, do_kp_irq,  in twl4030_kp_probe()
414 					  0, pdev->name, kp);  in twl4030_kp_probe()
416 		dev_info(kp->dbg_dev, "request_irq failed for irq no=%d: %d\n",  in twl4030_kp_probe()
417 			kp->irq, error);  in twl4030_kp_probe()
424 		/* mask all events - we don't care about the result */  in twl4030_kp_probe()
426 		return -EIO;  in twl4030_kp_probe()
434 	{ .compatible = "ti,twl4030-keypad" },
441  * NOTE: twl4030 are multi-function devices connected via I2C.