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