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Linux/drivers/input/keyboard/sh_keysc.c

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

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