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Linux/drivers/input/keyboard/davinci_keyscan.c

  1 /*
  2  * DaVinci Key Scan Driver for TI platforms
  3  *
  4  * Copyright (C) 2009 Texas Instruments, Inc
  5  *
  6  * Author: Miguel Aguilar <miguel.aguilar@ridgerun.com>
  7  *
  8  * Initial Code: Sandeep Paulraj <s-paulraj@ti.com>
  9  *
 10  * This program is free software; you can redistribute it and/or modify
 11  * it under the terms of the GNU General Public License as published by
 12  * the Free Software Foundation; either version 2 of the License, or
 13  * (at your option) any later version.
 14  *
 15  * This program is distributed in the hope that it will be useful,
 16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 18  * GNU General Public License for more details.
 19  *
 20  * You should have received a copy of the GNU General Public License
 21  * along with this program; if not, write to the Free Software
 22  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 23  */
 24 #include <linux/module.h>
 25 #include <linux/init.h>
 26 #include <linux/interrupt.h>
 27 #include <linux/types.h>
 28 #include <linux/input.h>
 29 #include <linux/kernel.h>
 30 #include <linux/delay.h>
 31 #include <linux/platform_device.h>
 32 #include <linux/errno.h>
 33 #include <linux/slab.h>
 34 
 35 #include <asm/irq.h>
 36 
 37 #include <mach/hardware.h>
 38 #include <mach/irqs.h>
 39 #include <linux/platform_data/keyscan-davinci.h>
 40 
 41 /* Key scan registers */
 42 #define DAVINCI_KEYSCAN_KEYCTRL         0x0000
 43 #define DAVINCI_KEYSCAN_INTENA          0x0004
 44 #define DAVINCI_KEYSCAN_INTFLAG         0x0008
 45 #define DAVINCI_KEYSCAN_INTCLR          0x000c
 46 #define DAVINCI_KEYSCAN_STRBWIDTH       0x0010
 47 #define DAVINCI_KEYSCAN_INTERVAL        0x0014
 48 #define DAVINCI_KEYSCAN_CONTTIME        0x0018
 49 #define DAVINCI_KEYSCAN_CURRENTST       0x001c
 50 #define DAVINCI_KEYSCAN_PREVSTATE       0x0020
 51 #define DAVINCI_KEYSCAN_EMUCTRL         0x0024
 52 #define DAVINCI_KEYSCAN_IODFTCTRL       0x002c
 53 
 54 /* Key Control Register (KEYCTRL) */
 55 #define DAVINCI_KEYSCAN_KEYEN           0x00000001
 56 #define DAVINCI_KEYSCAN_PREVMODE        0x00000002
 57 #define DAVINCI_KEYSCAN_CHATOFF         0x00000004
 58 #define DAVINCI_KEYSCAN_AUTODET         0x00000008
 59 #define DAVINCI_KEYSCAN_SCANMODE        0x00000010
 60 #define DAVINCI_KEYSCAN_OUTTYPE         0x00000020
 61 
 62 /* Masks for the interrupts */
 63 #define DAVINCI_KEYSCAN_INT_CONT        0x00000008
 64 #define DAVINCI_KEYSCAN_INT_OFF         0x00000004
 65 #define DAVINCI_KEYSCAN_INT_ON          0x00000002
 66 #define DAVINCI_KEYSCAN_INT_CHANGE      0x00000001
 67 #define DAVINCI_KEYSCAN_INT_ALL         0x0000000f
 68 
 69 struct davinci_ks {
 70         struct input_dev                *input;
 71         struct davinci_ks_platform_data *pdata;
 72         int                             irq;
 73         void __iomem                    *base;
 74         resource_size_t                 pbase;
 75         size_t                          base_size;
 76         unsigned short                  keymap[];
 77 };
 78 
 79 /* Initializing the kp Module */
 80 static int __init davinci_ks_initialize(struct davinci_ks *davinci_ks)
 81 {
 82         struct device *dev = &davinci_ks->input->dev;
 83         struct davinci_ks_platform_data *pdata = davinci_ks->pdata;
 84         u32 matrix_ctrl;
 85 
 86         /* Enable all interrupts */
 87         __raw_writel(DAVINCI_KEYSCAN_INT_ALL,
 88                      davinci_ks->base + DAVINCI_KEYSCAN_INTENA);
 89 
 90         /* Clear interrupts if any */
 91         __raw_writel(DAVINCI_KEYSCAN_INT_ALL,
 92                      davinci_ks->base + DAVINCI_KEYSCAN_INTCLR);
 93 
 94         /* Setup the scan period = strobe + interval */
 95         __raw_writel(pdata->strobe,
 96                      davinci_ks->base + DAVINCI_KEYSCAN_STRBWIDTH);
 97         __raw_writel(pdata->interval,
 98                      davinci_ks->base + DAVINCI_KEYSCAN_INTERVAL);
 99         __raw_writel(0x01,
100                      davinci_ks->base + DAVINCI_KEYSCAN_CONTTIME);
101 
102         /* Define matrix type */
103         switch (pdata->matrix_type) {
104         case DAVINCI_KEYSCAN_MATRIX_4X4:
105                 matrix_ctrl = 0;
106                 break;
107         case DAVINCI_KEYSCAN_MATRIX_5X3:
108                 matrix_ctrl = (1 << 6);
109                 break;
110         default:
111                 dev_err(dev->parent, "wrong matrix type\n");
112                 return -EINVAL;
113         }
114 
115         /* Enable key scan module and set matrix type */
116         __raw_writel(DAVINCI_KEYSCAN_AUTODET | DAVINCI_KEYSCAN_KEYEN |
117                      matrix_ctrl, davinci_ks->base + DAVINCI_KEYSCAN_KEYCTRL);
118 
119         return 0;
120 }
121 
122 static irqreturn_t davinci_ks_interrupt(int irq, void *dev_id)
123 {
124         struct davinci_ks *davinci_ks = dev_id;
125         struct device *dev = &davinci_ks->input->dev;
126         unsigned short *keymap = davinci_ks->keymap;
127         int keymapsize = davinci_ks->pdata->keymapsize;
128         u32 prev_status, new_status, changed;
129         bool release;
130         int keycode = KEY_UNKNOWN;
131         int i;
132 
133         /* Disable interrupt */
134         __raw_writel(0x0, davinci_ks->base + DAVINCI_KEYSCAN_INTENA);
135 
136         /* Reading previous and new status of the key scan */
137         prev_status = __raw_readl(davinci_ks->base + DAVINCI_KEYSCAN_PREVSTATE);
138         new_status = __raw_readl(davinci_ks->base + DAVINCI_KEYSCAN_CURRENTST);
139 
140         changed = prev_status ^ new_status;
141 
142         if (changed) {
143                 /*
144                  * It goes through all bits in 'changed' to ensure
145                  * that no key changes are being missed
146                  */
147                 for (i = 0 ; i < keymapsize; i++) {
148                         if ((changed>>i) & 0x1) {
149                                 keycode = keymap[i];
150                                 release = (new_status >> i) & 0x1;
151                                 dev_dbg(dev->parent, "key %d %s\n", keycode,
152                                         release ? "released" : "pressed");
153                                 input_report_key(davinci_ks->input, keycode,
154                                                  !release);
155                                 input_sync(davinci_ks->input);
156                         }
157                 }
158                 /* Clearing interrupt */
159                 __raw_writel(DAVINCI_KEYSCAN_INT_ALL,
160                              davinci_ks->base + DAVINCI_KEYSCAN_INTCLR);
161         }
162 
163         /* Enable interrupts */
164         __raw_writel(0x1, davinci_ks->base + DAVINCI_KEYSCAN_INTENA);
165 
166         return IRQ_HANDLED;
167 }
168 
169 static int __init davinci_ks_probe(struct platform_device *pdev)
170 {
171         struct davinci_ks *davinci_ks;
172         struct input_dev *key_dev;
173         struct resource *res, *mem;
174         struct device *dev = &pdev->dev;
175         struct davinci_ks_platform_data *pdata = dev_get_platdata(&pdev->dev);
176         int error, i;
177 
178         if (pdata->device_enable) {
179                 error = pdata->device_enable(dev);
180                 if (error < 0) {
181                         dev_dbg(dev, "device enable function failed\n");
182                         return error;
183                 }
184         }
185 
186         if (!pdata->keymap) {
187                 dev_dbg(dev, "no keymap from pdata\n");
188                 return -EINVAL;
189         }
190 
191         davinci_ks = kzalloc(sizeof(struct davinci_ks) +
192                 sizeof(unsigned short) * pdata->keymapsize, GFP_KERNEL);
193         if (!davinci_ks) {
194                 dev_dbg(dev, "could not allocate memory for private data\n");
195                 return -ENOMEM;
196         }
197 
198         memcpy(davinci_ks->keymap, pdata->keymap,
199                 sizeof(unsigned short) * pdata->keymapsize);
200 
201         key_dev = input_allocate_device();
202         if (!key_dev) {
203                 dev_dbg(dev, "could not allocate input device\n");
204                 error = -ENOMEM;
205                 goto fail1;
206         }
207 
208         davinci_ks->input = key_dev;
209 
210         davinci_ks->irq = platform_get_irq(pdev, 0);
211         if (davinci_ks->irq < 0) {
212                 dev_err(dev, "no key scan irq\n");
213                 error = davinci_ks->irq;
214                 goto fail2;
215         }
216 
217         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
218         if (!res) {
219                 dev_err(dev, "no mem resource\n");
220                 error = -EINVAL;
221                 goto fail2;
222         }
223 
224         davinci_ks->pbase = res->start;
225         davinci_ks->base_size = resource_size(res);
226 
227         mem = request_mem_region(davinci_ks->pbase, davinci_ks->base_size,
228                                  pdev->name);
229         if (!mem) {
230                 dev_err(dev, "key scan registers at %08x are not free\n",
231                         davinci_ks->pbase);
232                 error = -EBUSY;
233                 goto fail2;
234         }
235 
236         davinci_ks->base = ioremap(davinci_ks->pbase, davinci_ks->base_size);
237         if (!davinci_ks->base) {
238                 dev_err(dev, "can't ioremap MEM resource.\n");
239                 error = -ENOMEM;
240                 goto fail3;
241         }
242 
243         /* Enable auto repeat feature of Linux input subsystem */
244         if (pdata->rep)
245                 __set_bit(EV_REP, key_dev->evbit);
246 
247         /* Setup input device */
248         __set_bit(EV_KEY, key_dev->evbit);
249 
250         /* Setup the platform data */
251         davinci_ks->pdata = pdata;
252 
253         for (i = 0; i < davinci_ks->pdata->keymapsize; i++)
254                 __set_bit(davinci_ks->pdata->keymap[i], key_dev->keybit);
255 
256         key_dev->name = "davinci_keyscan";
257         key_dev->phys = "davinci_keyscan/input0";
258         key_dev->dev.parent = &pdev->dev;
259         key_dev->id.bustype = BUS_HOST;
260         key_dev->id.vendor = 0x0001;
261         key_dev->id.product = 0x0001;
262         key_dev->id.version = 0x0001;
263         key_dev->keycode = davinci_ks->keymap;
264         key_dev->keycodesize = sizeof(davinci_ks->keymap[0]);
265         key_dev->keycodemax = davinci_ks->pdata->keymapsize;
266 
267         error = input_register_device(davinci_ks->input);
268         if (error < 0) {
269                 dev_err(dev, "unable to register davinci key scan device\n");
270                 goto fail4;
271         }
272 
273         error = request_irq(davinci_ks->irq, davinci_ks_interrupt,
274                           0, pdev->name, davinci_ks);
275         if (error < 0) {
276                 dev_err(dev, "unable to register davinci key scan interrupt\n");
277                 goto fail5;
278         }
279 
280         error = davinci_ks_initialize(davinci_ks);
281         if (error < 0) {
282                 dev_err(dev, "unable to initialize davinci key scan device\n");
283                 goto fail6;
284         }
285 
286         platform_set_drvdata(pdev, davinci_ks);
287         return 0;
288 
289 fail6:
290         free_irq(davinci_ks->irq, davinci_ks);
291 fail5:
292         input_unregister_device(davinci_ks->input);
293         key_dev = NULL;
294 fail4:
295         iounmap(davinci_ks->base);
296 fail3:
297         release_mem_region(davinci_ks->pbase, davinci_ks->base_size);
298 fail2:
299         input_free_device(key_dev);
300 fail1:
301         kfree(davinci_ks);
302 
303         return error;
304 }
305 
306 static int davinci_ks_remove(struct platform_device *pdev)
307 {
308         struct davinci_ks *davinci_ks = platform_get_drvdata(pdev);
309 
310         free_irq(davinci_ks->irq, davinci_ks);
311 
312         input_unregister_device(davinci_ks->input);
313 
314         iounmap(davinci_ks->base);
315         release_mem_region(davinci_ks->pbase, davinci_ks->base_size);
316 
317         kfree(davinci_ks);
318 
319         return 0;
320 }
321 
322 static struct platform_driver davinci_ks_driver = {
323         .driver = {
324                 .name = "davinci_keyscan",
325                 .owner = THIS_MODULE,
326         },
327         .remove = davinci_ks_remove,
328 };
329 
330 module_platform_driver_probe(davinci_ks_driver, davinci_ks_probe);
331 
332 MODULE_AUTHOR("Miguel Aguilar");
333 MODULE_DESCRIPTION("Texas Instruments DaVinci Key Scan Driver");
334 MODULE_LICENSE("GPL");
335 

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