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10#include <linux/kernel.h>
11#include <linux/module.h>
12#include <linux/interrupt.h>
13#include <linux/irq.h>
14#include <linux/delay.h>
15#include <linux/platform_device.h>
16#include <linux/input.h>
17#include <linux/input/sh_keysc.h>
18#include <linux/bitmap.h>
19#include <linux/pm_runtime.h>
20#include <linux/io.h>
21#include <linux/slab.h>
22
23static const struct {
24 unsigned char kymd, keyout, keyin;
25} sh_keysc_mode[] = {
26 [SH_KEYSC_MODE_1] = { 0, 6, 5 },
27 [SH_KEYSC_MODE_2] = { 1, 5, 6 },
28 [SH_KEYSC_MODE_3] = { 2, 4, 7 },
29 [SH_KEYSC_MODE_4] = { 3, 6, 6 },
30 [SH_KEYSC_MODE_5] = { 4, 6, 7 },
31 [SH_KEYSC_MODE_6] = { 5, 8, 8 },
32};
33
34struct sh_keysc_priv {
35 void __iomem *iomem_base;
36 DECLARE_BITMAP(last_keys, SH_KEYSC_MAXKEYS);
37 struct input_dev *input;
38 struct sh_keysc_info pdata;
39};
40
41#define KYCR1 0
42#define KYCR2 1
43#define KYINDR 2
44#define KYOUTDR 3
45
46#define KYCR2_IRQ_LEVEL 0x10
47#define KYCR2_IRQ_DISABLED 0x00
48
49static unsigned long sh_keysc_read(struct sh_keysc_priv *p, int reg_nr)
50{
51 return ioread16(p->iomem_base + (reg_nr << 2));
52}
53
54static void sh_keysc_write(struct sh_keysc_priv *p, int reg_nr,
55 unsigned long value)
56{
57 iowrite16(value, p->iomem_base + (reg_nr << 2));
58}
59
60static void sh_keysc_level_mode(struct sh_keysc_priv *p,
61 unsigned long keys_set)
62{
63 struct sh_keysc_info *pdata = &p->pdata;
64
65 sh_keysc_write(p, KYOUTDR, 0);
66 sh_keysc_write(p, KYCR2, KYCR2_IRQ_LEVEL | (keys_set << 8));
67
68 if (pdata->kycr2_delay)
69 udelay(pdata->kycr2_delay);
70}
71
72static void sh_keysc_map_dbg(struct device *dev, unsigned long *map,
73 const char *str)
74{
75 int k;
76
77 for (k = 0; k < BITS_TO_LONGS(SH_KEYSC_MAXKEYS); k++)
78 dev_dbg(dev, "%s[%d] 0x%lx\n", str, k, map[k]);
79}
80
81static irqreturn_t sh_keysc_isr(int irq, void *dev_id)
82{
83 struct platform_device *pdev = dev_id;
84 struct sh_keysc_priv *priv = platform_get_drvdata(pdev);
85 struct sh_keysc_info *pdata = &priv->pdata;
86 int keyout_nr = sh_keysc_mode[pdata->mode].keyout;
87 int keyin_nr = sh_keysc_mode[pdata->mode].keyin;
88 DECLARE_BITMAP(keys, SH_KEYSC_MAXKEYS);
89 DECLARE_BITMAP(keys0, SH_KEYSC_MAXKEYS);
90 DECLARE_BITMAP(keys1, SH_KEYSC_MAXKEYS);
91 unsigned char keyin_set, tmp;
92 int i, k, n;
93
94 dev_dbg(&pdev->dev, "isr!\n");
95
96 bitmap_fill(keys1, SH_KEYSC_MAXKEYS);
97 bitmap_zero(keys0, SH_KEYSC_MAXKEYS);
98
99 do {
100 bitmap_zero(keys, SH_KEYSC_MAXKEYS);
101 keyin_set = 0;
102
103 sh_keysc_write(priv, KYCR2, KYCR2_IRQ_DISABLED);
104
105 for (i = 0; i < keyout_nr; i++) {
106 n = keyin_nr * i;
107
108
109 sh_keysc_write(priv, KYOUTDR, 0xffff ^ (3 << (i * 2)));
110 udelay(pdata->delay);
111 tmp = sh_keysc_read(priv, KYINDR);
112
113
114 for (k = 0; k < keyin_nr; k++) {
115 if (tmp & (1 << k))
116 __set_bit(n + k, keys);
117 }
118
119
120 keyin_set |= tmp ^ ((1 << keyin_nr) - 1);
121 }
122
123 sh_keysc_level_mode(priv, keyin_set);
124
125 bitmap_complement(keys, keys, SH_KEYSC_MAXKEYS);
126 bitmap_and(keys1, keys1, keys, SH_KEYSC_MAXKEYS);
127 bitmap_or(keys0, keys0, keys, SH_KEYSC_MAXKEYS);
128
129 sh_keysc_map_dbg(&pdev->dev, keys, "keys");
130
131 } while (sh_keysc_read(priv, KYCR2) & 0x01);
132
133 sh_keysc_map_dbg(&pdev->dev, priv->last_keys, "last_keys");
134 sh_keysc_map_dbg(&pdev->dev, keys0, "keys0");
135 sh_keysc_map_dbg(&pdev->dev, keys1, "keys1");
136
137 for (i = 0; i < SH_KEYSC_MAXKEYS; i++) {
138 k = pdata->keycodes[i];
139 if (!k)
140 continue;
141
142 if (test_bit(i, keys0) == test_bit(i, priv->last_keys))
143 continue;
144
145 if (test_bit(i, keys1) || test_bit(i, keys0)) {
146 input_event(priv->input, EV_KEY, k, 1);
147 __set_bit(i, priv->last_keys);
148 }
149
150 if (!test_bit(i, keys1)) {
151 input_event(priv->input, EV_KEY, k, 0);
152 __clear_bit(i, priv->last_keys);
153 }
154
155 }
156 input_sync(priv->input);
157
158 return IRQ_HANDLED;
159}
160
161static int sh_keysc_probe(struct platform_device *pdev)
162{
163 struct sh_keysc_priv *priv;
164 struct sh_keysc_info *pdata;
165 struct resource *res;
166 struct input_dev *input;
167 int i;
168 int irq, error;
169
170 if (!dev_get_platdata(&pdev->dev)) {
171 dev_err(&pdev->dev, "no platform data defined\n");
172 error = -EINVAL;
173 goto err0;
174 }
175
176 error = -ENXIO;
177 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
178 if (res == NULL) {
179 dev_err(&pdev->dev, "failed to get I/O memory\n");
180 goto err0;
181 }
182
183 irq = platform_get_irq(pdev, 0);
184 if (irq < 0) {
185 dev_err(&pdev->dev, "failed to get irq\n");
186 goto err0;
187 }
188
189 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
190 if (priv == NULL) {
191 dev_err(&pdev->dev, "failed to allocate driver data\n");
192 error = -ENOMEM;
193 goto err0;
194 }
195
196 platform_set_drvdata(pdev, priv);
197 memcpy(&priv->pdata, dev_get_platdata(&pdev->dev), sizeof(priv->pdata));
198 pdata = &priv->pdata;
199
200 priv->iomem_base = ioremap_nocache(res->start, resource_size(res));
201 if (priv->iomem_base == NULL) {
202 dev_err(&pdev->dev, "failed to remap I/O memory\n");
203 error = -ENXIO;
204 goto err1;
205 }
206
207 priv->input = input_allocate_device();
208 if (!priv->input) {
209 dev_err(&pdev->dev, "failed to allocate input device\n");
210 error = -ENOMEM;
211 goto err2;
212 }
213
214 input = priv->input;
215 input->evbit[0] = BIT_MASK(EV_KEY);
216
217 input->name = pdev->name;
218 input->phys = "sh-keysc-keys/input0";
219 input->dev.parent = &pdev->dev;
220
221 input->id.bustype = BUS_HOST;
222 input->id.vendor = 0x0001;
223 input->id.product = 0x0001;
224 input->id.version = 0x0100;
225
226 input->keycode = pdata->keycodes;
227 input->keycodesize = sizeof(pdata->keycodes[0]);
228 input->keycodemax = ARRAY_SIZE(pdata->keycodes);
229
230 error = request_threaded_irq(irq, NULL, sh_keysc_isr, IRQF_ONESHOT,
231 dev_name(&pdev->dev), pdev);
232 if (error) {
233 dev_err(&pdev->dev, "failed to request IRQ\n");
234 goto err3;
235 }
236
237 for (i = 0; i < SH_KEYSC_MAXKEYS; i++)
238 __set_bit(pdata->keycodes[i], input->keybit);
239 __clear_bit(KEY_RESERVED, input->keybit);
240
241 error = input_register_device(input);
242 if (error) {
243 dev_err(&pdev->dev, "failed to register input device\n");
244 goto err4;
245 }
246
247 pm_runtime_enable(&pdev->dev);
248 pm_runtime_get_sync(&pdev->dev);
249
250 sh_keysc_write(priv, KYCR1, (sh_keysc_mode[pdata->mode].kymd << 8) |
251 pdata->scan_timing);
252 sh_keysc_level_mode(priv, 0);
253
254 device_init_wakeup(&pdev->dev, 1);
255
256 return 0;
257
258 err4:
259 free_irq(irq, pdev);
260 err3:
261 input_free_device(input);
262 err2:
263 iounmap(priv->iomem_base);
264 err1:
265 kfree(priv);
266 err0:
267 return error;
268}
269
270static int sh_keysc_remove(struct platform_device *pdev)
271{
272 struct sh_keysc_priv *priv = platform_get_drvdata(pdev);
273
274 sh_keysc_write(priv, KYCR2, KYCR2_IRQ_DISABLED);
275
276 input_unregister_device(priv->input);
277 free_irq(platform_get_irq(pdev, 0), pdev);
278 iounmap(priv->iomem_base);
279
280 pm_runtime_put_sync(&pdev->dev);
281 pm_runtime_disable(&pdev->dev);
282
283 kfree(priv);
284
285 return 0;
286}
287
288#ifdef CONFIG_PM_SLEEP
289static int sh_keysc_suspend(struct device *dev)
290{
291 struct platform_device *pdev = to_platform_device(dev);
292 struct sh_keysc_priv *priv = platform_get_drvdata(pdev);
293 int irq = platform_get_irq(pdev, 0);
294 unsigned short value;
295
296 value = sh_keysc_read(priv, KYCR1);
297
298 if (device_may_wakeup(dev)) {
299 sh_keysc_write(priv, KYCR1, value | 0x80);
300 enable_irq_wake(irq);
301 } else {
302 sh_keysc_write(priv, KYCR1, value & ~0x80);
303 pm_runtime_put_sync(dev);
304 }
305
306 return 0;
307}
308
309static int sh_keysc_resume(struct device *dev)
310{
311 struct platform_device *pdev = to_platform_device(dev);
312 int irq = platform_get_irq(pdev, 0);
313
314 if (device_may_wakeup(dev))
315 disable_irq_wake(irq);
316 else
317 pm_runtime_get_sync(dev);
318
319 return 0;
320}
321#endif
322
323static SIMPLE_DEV_PM_OPS(sh_keysc_dev_pm_ops,
324 sh_keysc_suspend, sh_keysc_resume);
325
326static struct platform_driver sh_keysc_device_driver = {
327 .probe = sh_keysc_probe,
328 .remove = sh_keysc_remove,
329 .driver = {
330 .name = "sh_keysc",
331 .pm = &sh_keysc_dev_pm_ops,
332 }
333};
334module_platform_driver(sh_keysc_device_driver);
335
336MODULE_AUTHOR("Magnus Damm");
337MODULE_DESCRIPTION("SuperH KEYSC Keypad Driver");
338MODULE_LICENSE("GPL");
339
