1/*
  2 * Copyright (c) 2008-2009 Nuvoton technology corporation.
  3 *
  4 * Wan ZongShun <mcuos.com@gmail.com>
  5 *
  6 * This program is free software; you can redistribute it and/or modify
  7 * it under the terms of the GNU General Public License as published by
  8 * the Free Software Foundation;version 2 of the License.
  9 *
 10 */
 11
 12#include <linux/kernel.h>
 13#include <linux/module.h>
 14#include <linux/init.h>
 15#include <linux/interrupt.h>
 16#include <linux/input.h>
 17#include <linux/device.h>
 18#include <linux/platform_device.h>
 19#include <linux/clk.h>
 20#include <linux/err.h>
 21#include <linux/io.h>
 22#include <linux/slab.h>
 23
 24#include <mach/w90p910_keypad.h>
 25
 26/* Keypad Interface Control Registers */
 27#define KPI_CONF		0x00
 28#define KPI_3KCONF		0x04
 29#define KPI_LPCONF		0x08
 30#define KPI_STATUS		0x0C
 31
 32#define IS1KEY			(0x01 << 16)
 33#define INTTR			(0x01 << 21)
 34#define KEY0R			(0x0f << 3)
 35#define KEY0C			0x07
 36#define DEBOUNCE_BIT		0x08
 37#define KSIZE0			(0x01 << 16)
 38#define KSIZE1			(0x01 << 17)
 39#define KPSEL			(0x01 << 19)
 40#define ENKP			(0x01 << 18)
 41
 42#define KGET_RAW(n)		(((n) & KEY0R) >> 3)
 43#define KGET_COLUMN(n)		((n) & KEY0C)
 44
 45#define W90P910_NUM_ROWS	8
 46#define W90P910_NUM_COLS	8
 47#define W90P910_ROW_SHIFT	3
 48
 49struct w90p910_keypad {
 50	const struct w90p910_keypad_platform_data *pdata;
 51	struct clk *clk;
 52	struct input_dev *input_dev;
 53	void __iomem *mmio_base;
 54	int irq;
 55	unsigned short keymap[W90P910_NUM_ROWS * W90P910_NUM_COLS];
 56};
 57
 58static void w90p910_keypad_scan_matrix(struct w90p910_keypad *keypad,
 59							unsigned int status)
 60{
 61	struct input_dev *input_dev = keypad->input_dev;
 62	unsigned int row = KGET_RAW(status);
 63	unsigned int col = KGET_COLUMN(status);
 64	unsigned int code = MATRIX_SCAN_CODE(row, col, W90P910_ROW_SHIFT);
 65	unsigned int key = keypad->keymap[code];
 66
 67	input_event(input_dev, EV_MSC, MSC_SCAN, code);
 68	input_report_key(input_dev, key, 1);
 69	input_sync(input_dev);
 70
 71	input_event(input_dev, EV_MSC, MSC_SCAN, code);
 72	input_report_key(input_dev, key, 0);
 73	input_sync(input_dev);
 74}
 75
 76static irqreturn_t w90p910_keypad_irq_handler(int irq, void *dev_id)
 77{
 78	struct w90p910_keypad *keypad = dev_id;
 79	unsigned int  kstatus, val;
 80
 81	kstatus = __raw_readl(keypad->mmio_base + KPI_STATUS);
 82
 83	val = INTTR | IS1KEY;
 84
 85	if (kstatus & val)
 86		w90p910_keypad_scan_matrix(keypad, kstatus);
 87
 88	return IRQ_HANDLED;
 89}
 90
 91static int w90p910_keypad_open(struct input_dev *dev)
 92{
 93	struct w90p910_keypad *keypad = input_get_drvdata(dev);
 94	const struct w90p910_keypad_platform_data *pdata = keypad->pdata;
 95	unsigned int val, config;
 96
 97	/* Enable unit clock */
 98	clk_enable(keypad->clk);
 99
100	val = __raw_readl(keypad->mmio_base + KPI_CONF);
101	val |= (KPSEL | ENKP);
102	val &= ~(KSIZE0 | KSIZE1);
103
104	config = pdata->prescale | (pdata->debounce << DEBOUNCE_BIT);
105
106	val |= config;
107
108	__raw_writel(val, keypad->mmio_base + KPI_CONF);
109
110	return 0;
111}
112
113static void w90p910_keypad_close(struct input_dev *dev)
114{
115	struct w90p910_keypad *keypad = input_get_drvdata(dev);
116
117	/* Disable clock unit */
118	clk_disable(keypad->clk);
119}
120
121static int __devinit w90p910_keypad_probe(struct platform_device *pdev)
122{
123	const struct w90p910_keypad_platform_data *pdata =
124						pdev->dev.platform_data;
125	const struct matrix_keymap_data *keymap_data;
126	struct w90p910_keypad *keypad;
127	struct input_dev *input_dev;
128	struct resource *res;
129	int irq;
130	int error;
131
132	if (!pdata) {
133		dev_err(&pdev->dev, "no platform data defined\n");
134		return -EINVAL;
135	}
136
137	keymap_data = pdata->keymap_data;
138
139	irq = platform_get_irq(pdev, 0);
140	if (irq < 0) {
141		dev_err(&pdev->dev, "failed to get keypad irq\n");
142		return -ENXIO;
143	}
144
145	keypad = kzalloc(sizeof(struct w90p910_keypad), GFP_KERNEL);
146	input_dev = input_allocate_device();
147	if (!keypad || !input_dev) {
148		dev_err(&pdev->dev, "failed to allocate driver data\n");
149		error = -ENOMEM;
150		goto failed_free;
151	}
152
153	keypad->pdata = pdata;
154	keypad->input_dev = input_dev;
155	keypad->irq = irq;
156
157	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
158	if (res == NULL) {
159		dev_err(&pdev->dev, "failed to get I/O memory\n");
160		error = -ENXIO;
161		goto failed_free;
162	}
163
164	res = request_mem_region(res->start, resource_size(res), pdev->name);
165	if (res == NULL) {
166		dev_err(&pdev->dev, "failed to request I/O memory\n");
167		error = -EBUSY;
168		goto failed_free;
169	}
170
171	keypad->mmio_base = ioremap(res->start, resource_size(res));
172	if (keypad->mmio_base == NULL) {
173		dev_err(&pdev->dev, "failed to remap I/O memory\n");
174		error = -ENXIO;
175		goto failed_free_res;
176	}
177
178	keypad->clk = clk_get(&pdev->dev, NULL);
179	if (IS_ERR(keypad->clk)) {
180		dev_err(&pdev->dev, "failed to get keypad clock\n");
181		error = PTR_ERR(keypad->clk);
182		goto failed_free_io;
183	}
184
185	/* set multi-function pin for w90p910 kpi. */
186	mfp_set_groupi(&pdev->dev);
187
188	input_dev->name = pdev->name;
189	input_dev->id.bustype = BUS_HOST;
190	input_dev->open = w90p910_keypad_open;
191	input_dev->close = w90p910_keypad_close;
192	input_dev->dev.parent = &pdev->dev;
193
194	error = matrix_keypad_build_keymap(keymap_data, NULL,
195					   W90P910_NUM_ROWS, W90P910_NUM_COLS,
196					   keypad->keymap, input_dev);
197	if (error) {
198		dev_err(&pdev->dev, "failed to build keymap\n");
199		goto failed_put_clk;
200	}
201
202	error = request_irq(keypad->irq, w90p910_keypad_irq_handler,
203			    0, pdev->name, keypad);
204	if (error) {
205		dev_err(&pdev->dev, "failed to request IRQ\n");
206		goto failed_put_clk;
207	}
208
209	__set_bit(EV_REP, input_dev->evbit);
210	input_set_capability(input_dev, EV_MSC, MSC_SCAN);
211	input_set_drvdata(input_dev, keypad);
212
213	/* Register the input device */
214	error = input_register_device(input_dev);
215	if (error) {
216		dev_err(&pdev->dev, "failed to register input device\n");
217		goto failed_free_irq;
218	}
219
220	platform_set_drvdata(pdev, keypad);
221	return 0;
222
223failed_free_irq:
224	free_irq(irq, pdev);
225failed_put_clk:
226	clk_put(keypad->clk);
227failed_free_io:
228	iounmap(keypad->mmio_base);
229failed_free_res:
230	release_mem_region(res->start, resource_size(res));
231failed_free:
232	input_free_device(input_dev);
233	kfree(keypad);
234	return error;
235}
236
237static int __devexit w90p910_keypad_remove(struct platform_device *pdev)
238{
239	struct w90p910_keypad *keypad = platform_get_drvdata(pdev);
240	struct resource *res;
241
242	free_irq(keypad->irq, pdev);
243
244	clk_put(keypad->clk);
245
246	input_unregister_device(keypad->input_dev);
247
248	iounmap(keypad->mmio_base);
249	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
250	release_mem_region(res->start, resource_size(res));
251
252	platform_set_drvdata(pdev, NULL);
253	kfree(keypad);
254
255	return 0;
256}
257
258static struct platform_driver w90p910_keypad_driver = {
259	.probe		= w90p910_keypad_probe,
260	.remove		= __devexit_p(w90p910_keypad_remove),
261	.driver		= {
262		.name	= "nuc900-kpi",
263		.owner	= THIS_MODULE,
264	},
265};
266module_platform_driver(w90p910_keypad_driver);
267
268MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>");
269MODULE_DESCRIPTION("w90p910 keypad driver");
270MODULE_LICENSE("GPL");
271MODULE_ALIAS("platform:nuc900-keypad");