1 /*
2 * SuperH KEYSC Keypad Driver
3 *
4 * Copyright (C) 2008 Magnus Damm
5 *
6 * Based on gpio_keys.c, Copyright 2005 Phil Blundell
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12
13 #include <linux/kernel.h>
14 #include <linux/module.h>
15 #include <linux/init.h>
16 #include <linux/interrupt.h>
17 #include <linux/irq.h>
18 #include <linux/delay.h>
19 #include <linux/platform_device.h>
20 #include <linux/input.h>
21 #include <linux/clk.h>
22 #include <linux/io.h>
23 #include <asm/sh_keysc.h>
24
25 #define KYCR1_OFFS 0x00
26 #define KYCR2_OFFS 0x04
27 #define KYINDR_OFFS 0x08
28 #define KYOUTDR_OFFS 0x0c
29
30 #define KYCR2_IRQ_LEVEL 0x10
31 #define KYCR2_IRQ_DISABLED 0x00
32
33 static const struct {
34 unsigned char kymd, keyout, keyin;
35 } sh_keysc_mode[] = {
36 [SH_KEYSC_MODE_1] = { 0, 6, 5 },
37 [SH_KEYSC_MODE_2] = { 1, 5, 6 },
38 [SH_KEYSC_MODE_3] = { 2, 4, 7 },
39 };
40
41 struct sh_keysc_priv {
42 void __iomem *iomem_base;
43 struct clk *clk;
44 unsigned long last_keys;
45 struct input_dev *input;
46 struct sh_keysc_info pdata;
47 };
48
sh_keysc_isr(int irq,void * dev_id)49 static irqreturn_t sh_keysc_isr(int irq, void *dev_id)
50 {
51 struct platform_device *pdev = dev_id;
52 struct sh_keysc_priv *priv = platform_get_drvdata(pdev);
53 struct sh_keysc_info *pdata = &priv->pdata;
54 unsigned long keys, keys1, keys0, mask;
55 unsigned char keyin_set, tmp;
56 int i, k;
57
58 dev_dbg(&pdev->dev, "isr!\n");
59
60 keys1 = ~0;
61 keys0 = 0;
62
63 do {
64 keys = 0;
65 keyin_set = 0;
66
67 iowrite16(KYCR2_IRQ_DISABLED, priv->iomem_base + KYCR2_OFFS);
68
69 for (i = 0; i < sh_keysc_mode[pdata->mode].keyout; i++) {
70 iowrite16(0xfff ^ (3 << (i * 2)),
71 priv->iomem_base + KYOUTDR_OFFS);
72 udelay(pdata->delay);
73 tmp = ioread16(priv->iomem_base + KYINDR_OFFS);
74 keys |= tmp << (sh_keysc_mode[pdata->mode].keyin * i);
75 tmp ^= (1 << sh_keysc_mode[pdata->mode].keyin) - 1;
76 keyin_set |= tmp;
77 }
78
79 iowrite16(0, priv->iomem_base + KYOUTDR_OFFS);
80 iowrite16(KYCR2_IRQ_LEVEL | (keyin_set << 8),
81 priv->iomem_base + KYCR2_OFFS);
82
83 keys ^= ~0;
84 keys &= (1 << (sh_keysc_mode[pdata->mode].keyin *
85 sh_keysc_mode[pdata->mode].keyout)) - 1;
86 keys1 &= keys;
87 keys0 |= keys;
88
89 dev_dbg(&pdev->dev, "keys 0x%08lx\n", keys);
90
91 } while (ioread16(priv->iomem_base + KYCR2_OFFS) & 0x01);
92
93 dev_dbg(&pdev->dev, "last_keys 0x%08lx keys0 0x%08lx keys1 0x%08lx\n",
94 priv->last_keys, keys0, keys1);
95
96 for (i = 0; i < SH_KEYSC_MAXKEYS; i++) {
97 k = pdata->keycodes[i];
98 if (!k)
99 continue;
100
101 mask = 1 << i;
102
103 if (!((priv->last_keys ^ keys0) & mask))
104 continue;
105
106 if ((keys1 | keys0) & mask) {
107 input_event(priv->input, EV_KEY, k, 1);
108 priv->last_keys |= mask;
109 }
110
111 if (!(keys1 & mask)) {
112 input_event(priv->input, EV_KEY, k, 0);
113 priv->last_keys &= ~mask;
114 }
115
116 }
117 input_sync(priv->input);
118
119 return IRQ_HANDLED;
120 }
121
122 #define res_size(res) ((res)->end - (res)->start + 1)
123
sh_keysc_probe(struct platform_device * pdev)124 static int __devinit sh_keysc_probe(struct platform_device *pdev)
125 {
126 struct sh_keysc_priv *priv;
127 struct sh_keysc_info *pdata;
128 struct resource *res;
129 struct input_dev *input;
130 char clk_name[8];
131 int i, k;
132 int irq, error;
133
134 if (!pdev->dev.platform_data) {
135 dev_err(&pdev->dev, "no platform data defined\n");
136 error = -EINVAL;
137 goto err0;
138 }
139
140 error = -ENXIO;
141 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
142 if (res == NULL) {
143 dev_err(&pdev->dev, "failed to get I/O memory\n");
144 goto err0;
145 }
146
147 irq = platform_get_irq(pdev, 0);
148 if (irq < 0) {
149 dev_err(&pdev->dev, "failed to get irq\n");
150 goto err0;
151 }
152
153 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
154 if (priv == NULL) {
155 dev_err(&pdev->dev, "failed to allocate driver data\n");
156 error = -ENOMEM;
157 goto err0;
158 }
159
160 platform_set_drvdata(pdev, priv);
161 memcpy(&priv->pdata, pdev->dev.platform_data, sizeof(priv->pdata));
162 pdata = &priv->pdata;
163
164 priv->iomem_base = ioremap_nocache(res->start, res_size(res));
165 if (priv->iomem_base == NULL) {
166 dev_err(&pdev->dev, "failed to remap I/O memory\n");
167 error = -ENXIO;
168 goto err1;
169 }
170
171 snprintf(clk_name, sizeof(clk_name), "keysc%d", pdev->id);
172 priv->clk = clk_get(&pdev->dev, clk_name);
173 if (IS_ERR(priv->clk)) {
174 dev_err(&pdev->dev, "cannot get clock \"%s\"\n", clk_name);
175 error = PTR_ERR(priv->clk);
176 goto err2;
177 }
178
179 priv->input = input_allocate_device();
180 if (!priv->input) {
181 dev_err(&pdev->dev, "failed to allocate input device\n");
182 error = -ENOMEM;
183 goto err3;
184 }
185
186 input = priv->input;
187 input->evbit[0] = BIT_MASK(EV_KEY);
188
189 input->name = pdev->name;
190 input->phys = "sh-keysc-keys/input0";
191 input->dev.parent = &pdev->dev;
192
193 input->id.bustype = BUS_HOST;
194 input->id.vendor = 0x0001;
195 input->id.product = 0x0001;
196 input->id.version = 0x0100;
197
198 error = request_irq(irq, sh_keysc_isr, 0, pdev->name, pdev);
199 if (error) {
200 dev_err(&pdev->dev, "failed to request IRQ\n");
201 goto err4;
202 }
203
204 for (i = 0; i < SH_KEYSC_MAXKEYS; i++) {
205 k = pdata->keycodes[i];
206 if (k)
207 input_set_capability(input, EV_KEY, k);
208 }
209
210 error = input_register_device(input);
211 if (error) {
212 dev_err(&pdev->dev, "failed to register input device\n");
213 goto err5;
214 }
215
216 clk_enable(priv->clk);
217
218 iowrite16((sh_keysc_mode[pdata->mode].kymd << 8) |
219 pdata->scan_timing, priv->iomem_base + KYCR1_OFFS);
220 iowrite16(0, priv->iomem_base + KYOUTDR_OFFS);
221 iowrite16(KYCR2_IRQ_LEVEL, priv->iomem_base + KYCR2_OFFS);
222 return 0;
223 err5:
224 free_irq(irq, pdev);
225 err4:
226 input_free_device(input);
227 err3:
228 clk_put(priv->clk);
229 err2:
230 iounmap(priv->iomem_base);
231 err1:
232 platform_set_drvdata(pdev, NULL);
233 kfree(priv);
234 err0:
235 return error;
236 }
237
sh_keysc_remove(struct platform_device * pdev)238 static int __devexit sh_keysc_remove(struct platform_device *pdev)
239 {
240 struct sh_keysc_priv *priv = platform_get_drvdata(pdev);
241
242 iowrite16(KYCR2_IRQ_DISABLED, priv->iomem_base + KYCR2_OFFS);
243
244 input_unregister_device(priv->input);
245 free_irq(platform_get_irq(pdev, 0), pdev);
246 iounmap(priv->iomem_base);
247
248 clk_disable(priv->clk);
249 clk_put(priv->clk);
250
251 platform_set_drvdata(pdev, NULL);
252 kfree(priv);
253 return 0;
254 }
255
256
257 #define sh_keysc_suspend NULL
258 #define sh_keysc_resume NULL
259
260 struct platform_driver sh_keysc_device_driver = {
261 .probe = sh_keysc_probe,
262 .remove = __devexit_p(sh_keysc_remove),
263 .suspend = sh_keysc_suspend,
264 .resume = sh_keysc_resume,
265 .driver = {
266 .name = "sh_keysc",
267 }
268 };
269
sh_keysc_init(void)270 static int __init sh_keysc_init(void)
271 {
272 return platform_driver_register(&sh_keysc_device_driver);
273 }
274
sh_keysc_exit(void)275 static void __exit sh_keysc_exit(void)
276 {
277 platform_driver_unregister(&sh_keysc_device_driver);
278 }
279
280 module_init(sh_keysc_init);
281 module_exit(sh_keysc_exit);
282
283 MODULE_AUTHOR("Magnus Damm");
284 MODULE_DESCRIPTION("SuperH KEYSC Keypad Driver");
285 MODULE_LICENSE("GPL");
286