1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * NXP LPC32xx SoC Key Scan Interface
6  *    Kevin Wells <kevin.wells@nxp.com>
9  * Copyright (C) 2010 NXP Semiconductors
74 	struct input_dev *input = kscandat->input;  in lpc32xx_mod_states()
78 	key = readl(LPC32XX_KS_DATA(kscandat->kscan_base, col));  in lpc32xx_mod_states()
79 	changed = key ^ kscandat->lastkeystates[col];  in lpc32xx_mod_states()
80 	kscandat->lastkeystates[col] = key;  in lpc32xx_mod_states()
86 						    kscandat->row_shift);  in lpc32xx_mod_states()
87 			keycode = kscandat->keymap[scancode];  in lpc32xx_mod_states()
97 	int i;  in lpc32xx_kscan_irq()  local
99 	for (i = 0; i < kscandat->matrix_sz; i++)  in lpc32xx_kscan_irq()
100 		lpc32xx_mod_states(kscandat, i);  in lpc32xx_kscan_irq()
102 	writel(1, LPC32XX_KS_IRQ(kscandat->kscan_base));  in lpc32xx_kscan_irq()
104 	input_sync(kscandat->input);  in lpc32xx_kscan_irq()
114 	error = clk_prepare_enable(kscandat->clk);  in lpc32xx_kscan_open()
118 	writel(1, LPC32XX_KS_IRQ(kscandat->kscan_base));  in lpc32xx_kscan_open()
127 	writel(1, LPC32XX_KS_IRQ(kscandat->kscan_base));  in lpc32xx_kscan_close()
128 	clk_disable_unprepare(kscandat->clk);  in lpc32xx_kscan_close()
134 	struct device_node *np = dev->of_node;  in lpc32xx_parse_dt()
143 		return -EINVAL;  in lpc32xx_parse_dt()
146 	kscandat->matrix_sz = rows;  in lpc32xx_parse_dt()
147 	kscandat->row_shift = get_count_order(columns);  in lpc32xx_parse_dt()
149 	of_property_read_u32(np, "nxp,debounce-delay-ms", &kscandat->deb_clks);  in lpc32xx_parse_dt()
150 	of_property_read_u32(np, "nxp,scan-delay-ms", &kscandat->scan_delay);  in lpc32xx_parse_dt()
151 	if (!kscandat->deb_clks || !kscandat->scan_delay) {  in lpc32xx_parse_dt()
153 		return -EINVAL;  in lpc32xx_parse_dt()
170 		dev_err(&pdev->dev, "failed to get platform I/O memory\n");  in lpc32xx_kscan_probe()
171 		return -EINVAL;  in lpc32xx_kscan_probe()
176 		return -EINVAL;  in lpc32xx_kscan_probe()
178 	kscandat = devm_kzalloc(&pdev->dev, sizeof(*kscandat),  in lpc32xx_kscan_probe()
181 		return -ENOMEM;  in lpc32xx_kscan_probe()
183 	error = lpc32xx_parse_dt(&pdev->dev, kscandat);  in lpc32xx_kscan_probe()
185 		dev_err(&pdev->dev, "failed to parse device tree\n");  in lpc32xx_kscan_probe()
189 	keymap_size = sizeof(kscandat->keymap[0]) *  in lpc32xx_kscan_probe()
190 				(kscandat->matrix_sz << kscandat->row_shift);  in lpc32xx_kscan_probe()
191 	kscandat->keymap = devm_kzalloc(&pdev->dev, keymap_size, GFP_KERNEL);  in lpc32xx_kscan_probe()
192 	if (!kscandat->keymap)  in lpc32xx_kscan_probe()
193 		return -ENOMEM;  in lpc32xx_kscan_probe()
195 	kscandat->input = input = devm_input_allocate_device(&pdev->dev);  in lpc32xx_kscan_probe()
197 		dev_err(&pdev->dev, "failed to allocate input device\n");  in lpc32xx_kscan_probe()
198 		return -ENOMEM;  in lpc32xx_kscan_probe()
202 	input->name		= pdev->name;  in lpc32xx_kscan_probe()
203 	input->phys		= "lpc32xx/input0";  in lpc32xx_kscan_probe()
204 	input->id.vendor	= 0x0001;  in lpc32xx_kscan_probe()
205 	input->id.product	= 0x0001;  in lpc32xx_kscan_probe()
206 	input->id.version	= 0x0100;  in lpc32xx_kscan_probe()
207 	input->open		= lpc32xx_kscan_open;  in lpc32xx_kscan_probe()
208 	input->close		= lpc32xx_kscan_close;  in lpc32xx_kscan_probe()
209 	input->dev.parent	= &pdev->dev;  in lpc32xx_kscan_probe()
214 					   kscandat->matrix_sz,  in lpc32xx_kscan_probe()
215 					   kscandat->matrix_sz,  in lpc32xx_kscan_probe()
216 					   kscandat->keymap, kscandat->input);  in lpc32xx_kscan_probe()
218 		dev_err(&pdev->dev, "failed to build keymap\n");  in lpc32xx_kscan_probe()
222 	input_set_drvdata(kscandat->input, kscandat);  in lpc32xx_kscan_probe()
224 	kscandat->kscan_base = devm_ioremap_resource(&pdev->dev, res);  in lpc32xx_kscan_probe()
225 	if (IS_ERR(kscandat->kscan_base))  in lpc32xx_kscan_probe()
226 		return PTR_ERR(kscandat->kscan_base);  in lpc32xx_kscan_probe()
229 	kscandat->clk = devm_clk_get(&pdev->dev, NULL);  in lpc32xx_kscan_probe()
230 	if (IS_ERR(kscandat->clk)) {  in lpc32xx_kscan_probe()
231 		dev_err(&pdev->dev, "failed to get clock\n");  in lpc32xx_kscan_probe()
232 		return PTR_ERR(kscandat->clk);  in lpc32xx_kscan_probe()
236 	error = clk_prepare_enable(kscandat->clk);  in lpc32xx_kscan_probe()
240 	writel(kscandat->deb_clks, LPC32XX_KS_DEB(kscandat->kscan_base));  in lpc32xx_kscan_probe()
241 	writel(kscandat->scan_delay, LPC32XX_KS_SCAN_CTL(kscandat->kscan_base));  in lpc32xx_kscan_probe()
243 	       LPC32XX_KS_FAST_TST(kscandat->kscan_base));  in lpc32xx_kscan_probe()
244 	writel(kscandat->matrix_sz,  in lpc32xx_kscan_probe()
245 	       LPC32XX_KS_MATRIX_DIM(kscandat->kscan_base));  in lpc32xx_kscan_probe()
246 	writel(1, LPC32XX_KS_IRQ(kscandat->kscan_base));  in lpc32xx_kscan_probe()
247 	clk_disable_unprepare(kscandat->clk);  in lpc32xx_kscan_probe()
249 	error = devm_request_irq(&pdev->dev, irq, lpc32xx_kscan_irq, 0,  in lpc32xx_kscan_probe()
250 				 pdev->name, kscandat);  in lpc32xx_kscan_probe()
252 		dev_err(&pdev->dev, "failed to request irq\n");  in lpc32xx_kscan_probe()
256 	error = input_register_device(kscandat->input);  in lpc32xx_kscan_probe()
258 		dev_err(&pdev->dev, "failed to register input device\n");  in lpc32xx_kscan_probe()
272 	struct input_dev *input = kscandat->input;  in lpc32xx_kscan_suspend()
274 	mutex_lock(&input->mutex);  in lpc32xx_kscan_suspend()
278 		writel(1, LPC32XX_KS_IRQ(kscandat->kscan_base));  in lpc32xx_kscan_suspend()
279 		clk_disable_unprepare(kscandat->clk);  in lpc32xx_kscan_suspend()
282 	mutex_unlock(&input->mutex);  in lpc32xx_kscan_suspend()
290 	struct input_dev *input = kscandat->input;  in lpc32xx_kscan_resume()
293 	mutex_lock(&input->mutex);  in lpc32xx_kscan_resume()
297 		retval = clk_prepare_enable(kscandat->clk);  in lpc32xx_kscan_resume()
299 			writel(1, LPC32XX_KS_IRQ(kscandat->kscan_base));  in lpc32xx_kscan_resume()
302 	mutex_unlock(&input->mutex);  in lpc32xx_kscan_resume()
311 	{ .compatible = "nxp,lpc3220-key" },
328 MODULE_AUTHOR("Kevin Wells <kevin.wells@nxp.com>");