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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/input/sh_keysc.h>
22#include <linux/bitmap.h>
23#include <linux/pm_runtime.h>
24#include <linux/io.h>
25#include <linux/slab.h>
26
27static const struct {
28 unsigned char kymd, keyout, keyin;
29} sh_keysc_mode[] = {
30 [SH_KEYSC_MODE_1] = { 0, 6, 5 },
31 [SH_KEYSC_MODE_2] = { 1, 5, 6 },
32 [SH_KEYSC_MODE_3] = { 2, 4, 7 },
33 [SH_KEYSC_MODE_4] = { 3, 6, 6 },
34 [SH_KEYSC_MODE_5] = { 4, 6, 7 },
35 [SH_KEYSC_MODE_6] = { 5, 8, 8 },
36};
37
38struct sh_keysc_priv {
39 void __iomem *iomem_base;
40 DECLARE_BITMAP(last_keys, SH_KEYSC_MAXKEYS);
41 struct input_dev *input;
42 struct sh_keysc_info pdata;
43};
44
45#define KYCR1 0
46#define KYCR2 1
47#define KYINDR 2
48#define KYOUTDR 3
49
50#define KYCR2_IRQ_LEVEL 0x10
51#define KYCR2_IRQ_DISABLED 0x00
52
53static unsigned long sh_keysc_read(struct sh_keysc_priv *p, int reg_nr)
54{
55 return ioread16(p->iomem_base + (reg_nr << 2));
56}
57
58static void sh_keysc_write(struct sh_keysc_priv *p, int reg_nr,
59 unsigned long value)
60{
61 iowrite16(value, p->iomem_base + (reg_nr << 2));
62}
63
64static void sh_keysc_level_mode(struct sh_keysc_priv *p,
65 unsigned long keys_set)
66{
67 struct sh_keysc_info *pdata = &p->pdata;
68
69 sh_keysc_write(p, KYOUTDR, 0);
70 sh_keysc_write(p, KYCR2, KYCR2_IRQ_LEVEL | (keys_set << 8));
71
72 if (pdata->kycr2_delay)
73 udelay(pdata->kycr2_delay);
74}
75
76static void sh_keysc_map_dbg(struct device *dev, unsigned long *map,
77 const char *str)
78{
79 int k;
80
81 for (k = 0; k < BITS_TO_LONGS(SH_KEYSC_MAXKEYS); k++)
82 dev_dbg(dev, "%s[%d] 0x%lx\n", str, k, map[k]);
83}
84
85static irqreturn_t sh_keysc_isr(int irq, void *dev_id)
86{
87 struct platform_device *pdev = dev_id;
88 struct sh_keysc_priv *priv = platform_get_drvdata(pdev);
89 struct sh_keysc_info *pdata = &priv->pdata;
90 int keyout_nr = sh_keysc_mode[pdata->mode].keyout;
91 int keyin_nr = sh_keysc_mode[pdata->mode].keyin;
92 DECLARE_BITMAP(keys, SH_KEYSC_MAXKEYS);
93 DECLARE_BITMAP(keys0, SH_KEYSC_MAXKEYS);
94 DECLARE_BITMAP(keys1, SH_KEYSC_MAXKEYS);
95 unsigned char keyin_set, tmp;
96 int i, k, n;
97
98 dev_dbg(&pdev->dev, "isr!\n");
99
100 bitmap_fill(keys1, SH_KEYSC_MAXKEYS);
101 bitmap_zero(keys0, SH_KEYSC_MAXKEYS);
102
103 do {
104 bitmap_zero(keys, SH_KEYSC_MAXKEYS);
105 keyin_set = 0;
106
107 sh_keysc_write(priv, KYCR2, KYCR2_IRQ_DISABLED);
108
109 for (i = 0; i < keyout_nr; i++) {
110 n = keyin_nr * i;
111
112
113 sh_keysc_write(priv, KYOUTDR, 0xffff ^ (3 << (i * 2)));
114 udelay(pdata->delay);
115 tmp = sh_keysc_read(priv, KYINDR);
116
117
118 for (k = 0; k < keyin_nr; k++) {
119 if (tmp & (1 << k))
120 __set_bit(n + k, keys);
121 }
122
123
124 keyin_set |= tmp ^ ((1 << keyin_nr) - 1);
125 }
126
127 sh_keysc_level_mode(priv, keyin_set);
128
129 bitmap_complement(keys, keys, SH_KEYSC_MAXKEYS);
130 bitmap_and(keys1, keys1, keys, SH_KEYSC_MAXKEYS);
131 bitmap_or(keys0, keys0, keys, SH_KEYSC_MAXKEYS);
132
133 sh_keysc_map_dbg(&pdev->dev, keys, "keys");
134
135 } while (sh_keysc_read(priv, KYCR2) & 0x01);
136
137 sh_keysc_map_dbg(&pdev->dev, priv->last_keys, "last_keys");
138 sh_keysc_map_dbg(&pdev->dev, keys0, "keys0");
139 sh_keysc_map_dbg(&pdev->dev, keys1, "keys1");
140
141 for (i = 0; i < SH_KEYSC_MAXKEYS; i++) {
142 k = pdata->keycodes[i];
143 if (!k)
144 continue;
145
146 if (test_bit(i, keys0) == test_bit(i, priv->last_keys))
147 continue;
148
149 if (test_bit(i, keys1) || test_bit(i, keys0)) {
150 input_event(priv->input, EV_KEY, k, 1);
151 __set_bit(i, priv->last_keys);
152 }
153
154 if (!test_bit(i, keys1)) {
155 input_event(priv->input, EV_KEY, k, 0);
156 __clear_bit(i, priv->last_keys);
157 }
158
159 }
160 input_sync(priv->input);
161
162 return IRQ_HANDLED;
163}
164
165static int sh_keysc_probe(struct platform_device *pdev)
166{
167 struct sh_keysc_priv *priv;
168 struct sh_keysc_info *pdata;
169 struct resource *res;
170 struct input_dev *input;
171 int i;
172 int irq, error;
173
174 if (!pdev->dev.platform_data) {
175 dev_err(&pdev->dev, "no platform data defined\n");
176 error = -EINVAL;
177 goto err0;
178 }
179
180 error = -ENXIO;
181 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
182 if (res == NULL) {
183 dev_err(&pdev->dev, "failed to get I/O memory\n");
184 goto err0;
185 }
186
187 irq = platform_get_irq(pdev, 0);
188 if (irq < 0) {
189 dev_err(&pdev->dev, "failed to get irq\n");
190 goto err0;
191 }
192
193 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
194 if (priv == NULL) {
195 dev_err(&pdev->dev, "failed to allocate driver data\n");
196 error = -ENOMEM;
197 goto err0;
198 }
199
200 platform_set_drvdata(pdev, priv);
201 memcpy(&priv->pdata, pdev->dev.platform_data, sizeof(priv->pdata));
202 pdata = &priv->pdata;
203
204 priv->iomem_base = ioremap_nocache(res->start, resource_size(res));
205 if (priv->iomem_base == NULL) {
206 dev_err(&pdev->dev, "failed to remap I/O memory\n");
207 error = -ENXIO;
208 goto err1;
209 }
210
211 priv->input = input_allocate_device();
212 if (!priv->input) {
213 dev_err(&pdev->dev, "failed to allocate input device\n");
214 error = -ENOMEM;
215 goto err2;
216 }
217
218 input = priv->input;
219 input->evbit[0] = BIT_MASK(EV_KEY);
220
221 input->name = pdev->name;
222 input->phys = "sh-keysc-keys/input0";
223 input->dev.parent = &pdev->dev;
224
225 input->id.bustype = BUS_HOST;
226 input->id.vendor = 0x0001;
227 input->id.product = 0x0001;
228 input->id.version = 0x0100;
229
230 input->keycode = pdata->keycodes;
231 input->keycodesize = sizeof(pdata->keycodes[0]);
232 input->keycodemax = ARRAY_SIZE(pdata->keycodes);
233
234 error = request_threaded_irq(irq, NULL, sh_keysc_isr, IRQF_ONESHOT,
235 dev_name(&pdev->dev), pdev);
236 if (error) {
237 dev_err(&pdev->dev, "failed to request IRQ\n");
238 goto err3;
239 }
240
241 for (i = 0; i < SH_KEYSC_MAXKEYS; i++)
242 __set_bit(pdata->keycodes[i], input->keybit);
243 __clear_bit(KEY_RESERVED, input->keybit);
244
245 error = input_register_device(input);
246 if (error) {
247 dev_err(&pdev->dev, "failed to register input device\n");
248 goto err4;
249 }
250
251 pm_runtime_enable(&pdev->dev);
252 pm_runtime_get_sync(&pdev->dev);
253
254 sh_keysc_write(priv, KYCR1, (sh_keysc_mode[pdata->mode].kymd << 8) |
255 pdata->scan_timing);
256 sh_keysc_level_mode(priv, 0);
257
258 device_init_wakeup(&pdev->dev, 1);
259
260 return 0;
261
262 err4:
263 free_irq(irq, pdev);
264 err3:
265 input_free_device(input);
266 err2:
267 iounmap(priv->iomem_base);
268 err1:
269 platform_set_drvdata(pdev, NULL);
270 kfree(priv);
271 err0:
272 return error;
273}
274
275static int sh_keysc_remove(struct platform_device *pdev)
276{
277 struct sh_keysc_priv *priv = platform_get_drvdata(pdev);
278
279 sh_keysc_write(priv, KYCR2, KYCR2_IRQ_DISABLED);
280
281 input_unregister_device(priv->input);
282 free_irq(platform_get_irq(pdev, 0), pdev);
283 iounmap(priv->iomem_base);
284
285 pm_runtime_put_sync(&pdev->dev);
286 pm_runtime_disable(&pdev->dev);
287
288 platform_set_drvdata(pdev, NULL);
289 kfree(priv);
290
291 return 0;
292}
293
294#ifdef CONFIG_PM_SLEEP
295static int sh_keysc_suspend(struct device *dev)
296{
297 struct platform_device *pdev = to_platform_device(dev);
298 struct sh_keysc_priv *priv = platform_get_drvdata(pdev);
299 int irq = platform_get_irq(pdev, 0);
300 unsigned short value;
301
302 value = sh_keysc_read(priv, KYCR1);
303
304 if (device_may_wakeup(dev)) {
305 sh_keysc_write(priv, KYCR1, value | 0x80);
306 enable_irq_wake(irq);
307 } else {
308 sh_keysc_write(priv, KYCR1, value & ~0x80);
309 pm_runtime_put_sync(dev);
310 }
311
312 return 0;
313}
314
315static int sh_keysc_resume(struct device *dev)
316{
317 struct platform_device *pdev = to_platform_device(dev);
318 int irq = platform_get_irq(pdev, 0);
319
320 if (device_may_wakeup(dev))
321 disable_irq_wake(irq);
322 else
323 pm_runtime_get_sync(dev);
324
325 return 0;
326}
327#endif
328
329static SIMPLE_DEV_PM_OPS(sh_keysc_dev_pm_ops,
330 sh_keysc_suspend, sh_keysc_resume);
331
332static struct platform_driver sh_keysc_device_driver = {
333 .probe = sh_keysc_probe,
334 .remove = sh_keysc_remove,
335 .driver = {
336 .name = "sh_keysc",
337 .pm = &sh_keysc_dev_pm_ops,
338 }
339};
340module_platform_driver(sh_keysc_device_driver);
341
342MODULE_AUTHOR("Magnus Damm");
343MODULE_DESCRIPTION("SuperH KEYSC Keypad Driver");
344MODULE_LICENSE("GPL");
345
