Commit | Line | Data |
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795e6bf3 MD |
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> | |
fc1d003d | 21 | #include <linux/input/sh_keysc.h> |
324e5ade | 22 | #include <linux/bitmap.h> |
b6d2a3e6 | 23 | #include <linux/pm_runtime.h> |
795e6bf3 | 24 | #include <linux/io.h> |
5a0e3ad6 | 25 | #include <linux/slab.h> |
795e6bf3 | 26 | |
795e6bf3 MD |
27 | static 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 }, | |
3bf12763 MD |
33 | [SH_KEYSC_MODE_4] = { 3, 6, 6 }, |
34 | [SH_KEYSC_MODE_5] = { 4, 6, 7 }, | |
cca23d0b | 35 | [SH_KEYSC_MODE_6] = { 5, 8, 8 }, |
795e6bf3 MD |
36 | }; |
37 | ||
38 | struct sh_keysc_priv { | |
39 | void __iomem *iomem_base; | |
324e5ade | 40 | DECLARE_BITMAP(last_keys, SH_KEYSC_MAXKEYS); |
795e6bf3 MD |
41 | struct input_dev *input; |
42 | struct sh_keysc_info pdata; | |
43 | }; | |
44 | ||
2b14a808 MD |
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 | ||
53 | static 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 | ||
58 | static 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 | ||
64 | static 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 | ||
324e5ade MD |
76 | static 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 | ||
795e6bf3 MD |
85 | static 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; | |
324e5ade MD |
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); | |
795e6bf3 | 95 | unsigned char keyin_set, tmp; |
324e5ade | 96 | int i, k, n; |
795e6bf3 MD |
97 | |
98 | dev_dbg(&pdev->dev, "isr!\n"); | |
99 | ||
324e5ade MD |
100 | bitmap_fill(keys1, SH_KEYSC_MAXKEYS); |
101 | bitmap_zero(keys0, SH_KEYSC_MAXKEYS); | |
795e6bf3 MD |
102 | |
103 | do { | |
324e5ade | 104 | bitmap_zero(keys, SH_KEYSC_MAXKEYS); |
795e6bf3 MD |
105 | keyin_set = 0; |
106 | ||
2b14a808 | 107 | sh_keysc_write(priv, KYCR2, KYCR2_IRQ_DISABLED); |
795e6bf3 | 108 | |
324e5ade MD |
109 | for (i = 0; i < keyout_nr; i++) { |
110 | n = keyin_nr * i; | |
111 | ||
112 | /* drive one KEYOUT pin low, read KEYIN pins */ | |
8f8be243 | 113 | sh_keysc_write(priv, KYOUTDR, 0xffff ^ (3 << (i * 2))); |
795e6bf3 | 114 | udelay(pdata->delay); |
2b14a808 MD |
115 | tmp = sh_keysc_read(priv, KYINDR); |
116 | ||
324e5ade MD |
117 | /* set bit if key press has been detected */ |
118 | for (k = 0; k < keyin_nr; k++) { | |
119 | if (tmp & (1 << k)) | |
120 | __set_bit(n + k, keys); | |
121 | } | |
122 | ||
123 | /* keep track of which KEYIN bits that have been set */ | |
124 | keyin_set |= tmp ^ ((1 << keyin_nr) - 1); | |
795e6bf3 MD |
125 | } |
126 | ||
2b14a808 | 127 | sh_keysc_level_mode(priv, keyin_set); |
1f85d381 | 128 | |
324e5ade MD |
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); | |
795e6bf3 | 132 | |
324e5ade | 133 | sh_keysc_map_dbg(&pdev->dev, keys, "keys"); |
795e6bf3 | 134 | |
2b14a808 | 135 | } while (sh_keysc_read(priv, KYCR2) & 0x01); |
795e6bf3 | 136 | |
324e5ade MD |
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"); | |
795e6bf3 MD |
140 | |
141 | for (i = 0; i < SH_KEYSC_MAXKEYS; i++) { | |
142 | k = pdata->keycodes[i]; | |
143 | if (!k) | |
144 | continue; | |
145 | ||
324e5ade | 146 | if (test_bit(i, keys0) == test_bit(i, priv->last_keys)) |
795e6bf3 MD |
147 | continue; |
148 | ||
324e5ade | 149 | if (test_bit(i, keys1) || test_bit(i, keys0)) { |
795e6bf3 | 150 | input_event(priv->input, EV_KEY, k, 1); |
324e5ade | 151 | __set_bit(i, priv->last_keys); |
795e6bf3 MD |
152 | } |
153 | ||
324e5ade | 154 | if (!test_bit(i, keys1)) { |
795e6bf3 | 155 | input_event(priv->input, EV_KEY, k, 0); |
324e5ade | 156 | __clear_bit(i, priv->last_keys); |
795e6bf3 MD |
157 | } |
158 | ||
159 | } | |
160 | input_sync(priv->input); | |
161 | ||
162 | return IRQ_HANDLED; | |
163 | } | |
164 | ||
795e6bf3 MD |
165 | static int __devinit 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; | |
24d01c06 | 171 | int i; |
795e6bf3 MD |
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 | ||
3bf12763 | 204 | priv->iomem_base = ioremap_nocache(res->start, resource_size(res)); |
795e6bf3 MD |
205 | if (priv->iomem_base == NULL) { |
206 | dev_err(&pdev->dev, "failed to remap I/O memory\n"); | |
207 | error = -ENXIO; | |
d3aa43a9 | 208 | goto err1; |
795e6bf3 MD |
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; | |
b6d2a3e6 | 215 | goto err2; |
795e6bf3 MD |
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 | ||
24d01c06 DT |
230 | input->keycode = pdata->keycodes; |
231 | input->keycodesize = sizeof(pdata->keycodes[0]); | |
232 | input->keycodemax = ARRAY_SIZE(pdata->keycodes); | |
233 | ||
2dfb9a85 MD |
234 | error = request_threaded_irq(irq, NULL, sh_keysc_isr, IRQF_ONESHOT, |
235 | dev_name(&pdev->dev), pdev); | |
795e6bf3 MD |
236 | if (error) { |
237 | dev_err(&pdev->dev, "failed to request IRQ\n"); | |
b6d2a3e6 | 238 | goto err3; |
795e6bf3 MD |
239 | } |
240 | ||
24d01c06 DT |
241 | for (i = 0; i < SH_KEYSC_MAXKEYS; i++) |
242 | __set_bit(pdata->keycodes[i], input->keybit); | |
243 | __clear_bit(KEY_RESERVED, input->keybit); | |
795e6bf3 MD |
244 | |
245 | error = input_register_device(input); | |
246 | if (error) { | |
247 | dev_err(&pdev->dev, "failed to register input device\n"); | |
b6d2a3e6 | 248 | goto err4; |
795e6bf3 MD |
249 | } |
250 | ||
b6d2a3e6 MD |
251 | pm_runtime_enable(&pdev->dev); |
252 | pm_runtime_get_sync(&pdev->dev); | |
090d951b | 253 | |
2b14a808 MD |
254 | sh_keysc_write(priv, KYCR1, (sh_keysc_mode[pdata->mode].kymd << 8) | |
255 | pdata->scan_timing); | |
256 | sh_keysc_level_mode(priv, 0); | |
a29b99ec MD |
257 | |
258 | device_init_wakeup(&pdev->dev, 1); | |
24d01c06 | 259 | |
795e6bf3 | 260 | return 0; |
24d01c06 | 261 | |
090d951b | 262 | err4: |
b6d2a3e6 | 263 | free_irq(irq, pdev); |
090d951b | 264 | err3: |
b6d2a3e6 | 265 | input_free_device(input); |
795e6bf3 | 266 | err2: |
d3aa43a9 | 267 | iounmap(priv->iomem_base); |
795e6bf3 MD |
268 | err1: |
269 | platform_set_drvdata(pdev, NULL); | |
270 | kfree(priv); | |
271 | err0: | |
272 | return error; | |
273 | } | |
274 | ||
275 | static int __devexit sh_keysc_remove(struct platform_device *pdev) | |
276 | { | |
277 | struct sh_keysc_priv *priv = platform_get_drvdata(pdev); | |
795e6bf3 | 278 | |
2b14a808 | 279 | sh_keysc_write(priv, KYCR2, KYCR2_IRQ_DISABLED); |
795e6bf3 MD |
280 | |
281 | input_unregister_device(priv->input); | |
282 | free_irq(platform_get_irq(pdev, 0), pdev); | |
795e6bf3 MD |
283 | iounmap(priv->iomem_base); |
284 | ||
b6d2a3e6 MD |
285 | pm_runtime_put_sync(&pdev->dev); |
286 | pm_runtime_disable(&pdev->dev); | |
090d951b | 287 | |
795e6bf3 MD |
288 | platform_set_drvdata(pdev, NULL); |
289 | kfree(priv); | |
24d01c06 | 290 | |
795e6bf3 MD |
291 | return 0; |
292 | } | |
293 | ||
cca8edfd | 294 | #ifdef CONFIG_PM_SLEEP |
a29b99ec MD |
295 | static int sh_keysc_suspend(struct device *dev) |
296 | { | |
49976927 MD |
297 | struct platform_device *pdev = to_platform_device(dev); |
298 | struct sh_keysc_priv *priv = platform_get_drvdata(pdev); | |
4ba50df6 | 299 | int irq = platform_get_irq(pdev, 0); |
a29b99ec MD |
300 | unsigned short value; |
301 | ||
2b14a808 | 302 | value = sh_keysc_read(priv, KYCR1); |
795e6bf3 | 303 | |
4ba50df6 | 304 | if (device_may_wakeup(dev)) { |
b6d2a3e6 | 305 | sh_keysc_write(priv, KYCR1, value | 0x80); |
4ba50df6 | 306 | enable_irq_wake(irq); |
24d01c06 | 307 | } else { |
b6d2a3e6 MD |
308 | sh_keysc_write(priv, KYCR1, value & ~0x80); |
309 | pm_runtime_put_sync(dev); | |
24d01c06 | 310 | } |
a29b99ec | 311 | |
a29b99ec MD |
312 | return 0; |
313 | } | |
314 | ||
4ba50df6 MD |
315 | static 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); | |
b6d2a3e6 MD |
322 | else |
323 | pm_runtime_get_sync(dev); | |
4ba50df6 MD |
324 | |
325 | return 0; | |
326 | } | |
9cc7c80b | 327 | #endif |
4ba50df6 | 328 | |
9cc7c80b DT |
329 | static SIMPLE_DEV_PM_OPS(sh_keysc_dev_pm_ops, |
330 | sh_keysc_suspend, sh_keysc_resume); | |
795e6bf3 | 331 | |
12d0cef7 | 332 | static struct platform_driver sh_keysc_device_driver = { |
795e6bf3 | 333 | .probe = sh_keysc_probe, |
1cb0aa88 | 334 | .remove = sh_keysc_remove, |
795e6bf3 MD |
335 | .driver = { |
336 | .name = "sh_keysc", | |
a29b99ec | 337 | .pm = &sh_keysc_dev_pm_ops, |
795e6bf3 MD |
338 | } |
339 | }; | |
5146c84f | 340 | module_platform_driver(sh_keysc_device_driver); |
795e6bf3 MD |
341 | |
342 | MODULE_AUTHOR("Magnus Damm"); | |
343 | MODULE_DESCRIPTION("SuperH KEYSC Keypad Driver"); | |
344 | MODULE_LICENSE("GPL"); |