Merge branch 'linus' into sched/core
[linux-3.10.git] / drivers / input / misc / twl4030-vibra.c
1 /*
2  * twl4030-vibra.c - TWL4030 Vibrator driver
3  *
4  * Copyright (C) 2008-2010 Nokia Corporation
5  *
6  * Written by Henrik Saari <henrik.saari@nokia.com>
7  * Updates by Felipe Balbi <felipe.balbi@nokia.com>
8  * Input by Jari Vanhala <ext-jari.vanhala@nokia.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 version 2 as
12  * published by the Free Software Foundation.
13  *
14  * This program is distributed in the hope that it will be useful, but
15  * WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
17  * General Public License for more details.
18  *
19  * You should have received a copy of the GNU General Public License
20  * along with this program; if not, write to the Free Software
21  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
22  * 02110-1301 USA
23  *
24  */
25
26 #include <linux/module.h>
27 #include <linux/jiffies.h>
28 #include <linux/platform_device.h>
29 #include <linux/workqueue.h>
30 #include <linux/i2c/twl.h>
31 #include <linux/mfd/twl4030-codec.h>
32 #include <linux/input.h>
33 #include <linux/slab.h>
34
35 /* MODULE ID2 */
36 #define LEDEN           0x00
37
38 /* ForceFeedback */
39 #define EFFECT_DIR_180_DEG      0x8000 /* range is 0 - 0xFFFF */
40
41 struct vibra_info {
42         struct device           *dev;
43         struct input_dev        *input_dev;
44
45         struct workqueue_struct *workqueue;
46         struct work_struct      play_work;
47
48         bool                    enabled;
49         int                     speed;
50         int                     direction;
51
52         bool                    coexist;
53 };
54
55 static void vibra_disable_leds(void)
56 {
57         u8 reg;
58
59         /* Disable LEDA & LEDB, cannot be used with vibra (PWM) */
60         twl_i2c_read_u8(TWL4030_MODULE_LED, &reg, LEDEN);
61         reg &= ~0x03;
62         twl_i2c_write_u8(TWL4030_MODULE_LED, LEDEN, reg);
63 }
64
65 /* Powers H-Bridge and enables audio clk */
66 static void vibra_enable(struct vibra_info *info)
67 {
68         u8 reg;
69
70         twl4030_codec_enable_resource(TWL4030_CODEC_RES_POWER);
71
72         /* turn H-Bridge on */
73         twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE,
74                         &reg, TWL4030_REG_VIBRA_CTL);
75         twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE,
76                          (reg | TWL4030_VIBRA_EN), TWL4030_REG_VIBRA_CTL);
77
78         twl4030_codec_enable_resource(TWL4030_CODEC_RES_APLL);
79
80         info->enabled = true;
81 }
82
83 static void vibra_disable(struct vibra_info *info)
84 {
85         u8 reg;
86
87         /* Power down H-Bridge */
88         twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE,
89                         &reg, TWL4030_REG_VIBRA_CTL);
90         twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE,
91                          (reg & ~TWL4030_VIBRA_EN), TWL4030_REG_VIBRA_CTL);
92
93         twl4030_codec_disable_resource(TWL4030_CODEC_RES_POWER);
94         twl4030_codec_disable_resource(TWL4030_CODEC_RES_APLL);
95
96         info->enabled = false;
97 }
98
99 static void vibra_play_work(struct work_struct *work)
100 {
101         struct vibra_info *info = container_of(work,
102                         struct vibra_info, play_work);
103         int dir;
104         int pwm;
105         u8 reg;
106
107         dir = info->direction;
108         pwm = info->speed;
109
110         twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE,
111                         &reg, TWL4030_REG_VIBRA_CTL);
112         if (pwm && (!info->coexist || !(reg & TWL4030_VIBRA_SEL))) {
113
114                 if (!info->enabled)
115                         vibra_enable(info);
116
117                 /* set vibra rotation direction */
118                 twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE,
119                                 &reg, TWL4030_REG_VIBRA_CTL);
120                 reg = (dir) ? (reg | TWL4030_VIBRA_DIR) :
121                         (reg & ~TWL4030_VIBRA_DIR);
122                 twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE,
123                                  reg, TWL4030_REG_VIBRA_CTL);
124
125                 /* set PWM, 1 = max, 255 = min */
126                 twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE,
127                                  256 - pwm, TWL4030_REG_VIBRA_SET);
128         } else {
129                 if (info->enabled)
130                         vibra_disable(info);
131         }
132 }
133
134 /*** Input/ForceFeedback ***/
135
136 static int vibra_play(struct input_dev *input, void *data,
137                       struct ff_effect *effect)
138 {
139         struct vibra_info *info = input_get_drvdata(input);
140
141         info->speed = effect->u.rumble.strong_magnitude >> 8;
142         if (!info->speed)
143                 info->speed = effect->u.rumble.weak_magnitude >> 9;
144         info->direction = effect->direction < EFFECT_DIR_180_DEG ? 0 : 1;
145         queue_work(info->workqueue, &info->play_work);
146         return 0;
147 }
148
149 static int twl4030_vibra_open(struct input_dev *input)
150 {
151         struct vibra_info *info = input_get_drvdata(input);
152
153         info->workqueue = create_singlethread_workqueue("vibra");
154         if (info->workqueue == NULL) {
155                 dev_err(&input->dev, "couldn't create workqueue\n");
156                 return -ENOMEM;
157         }
158         return 0;
159 }
160
161 static void twl4030_vibra_close(struct input_dev *input)
162 {
163         struct vibra_info *info = input_get_drvdata(input);
164
165         cancel_work_sync(&info->play_work);
166         INIT_WORK(&info->play_work, vibra_play_work); /* cleanup */
167         destroy_workqueue(info->workqueue);
168         info->workqueue = NULL;
169
170         if (info->enabled)
171                 vibra_disable(info);
172 }
173
174 /*** Module ***/
175 #if CONFIG_PM
176 static int twl4030_vibra_suspend(struct device *dev)
177 {
178         struct platform_device *pdev = to_platform_device(dev);
179         struct vibra_info *info = platform_get_drvdata(pdev);
180
181         if (info->enabled)
182                 vibra_disable(info);
183
184         return 0;
185 }
186
187 static int twl4030_vibra_resume(struct device *dev)
188 {
189         vibra_disable_leds();
190         return 0;
191 }
192
193 static SIMPLE_DEV_PM_OPS(twl4030_vibra_pm_ops,
194                          twl4030_vibra_suspend, twl4030_vibra_resume);
195 #endif
196
197 static int __devinit twl4030_vibra_probe(struct platform_device *pdev)
198 {
199         struct twl4030_codec_vibra_data *pdata = pdev->dev.platform_data;
200         struct vibra_info *info;
201         int ret;
202
203         if (!pdata) {
204                 dev_dbg(&pdev->dev, "platform_data not available\n");
205                 return -EINVAL;
206         }
207
208         info = kzalloc(sizeof(*info), GFP_KERNEL);
209         if (!info)
210                 return -ENOMEM;
211
212         info->dev = &pdev->dev;
213         info->coexist = pdata->coexist;
214         INIT_WORK(&info->play_work, vibra_play_work);
215
216         info->input_dev = input_allocate_device();
217         if (info->input_dev == NULL) {
218                 dev_err(&pdev->dev, "couldn't allocate input device\n");
219                 ret = -ENOMEM;
220                 goto err_kzalloc;
221         }
222
223         input_set_drvdata(info->input_dev, info);
224
225         info->input_dev->name = "twl4030:vibrator";
226         info->input_dev->id.version = 1;
227         info->input_dev->dev.parent = pdev->dev.parent;
228         info->input_dev->open = twl4030_vibra_open;
229         info->input_dev->close = twl4030_vibra_close;
230         __set_bit(FF_RUMBLE, info->input_dev->ffbit);
231
232         ret = input_ff_create_memless(info->input_dev, NULL, vibra_play);
233         if (ret < 0) {
234                 dev_dbg(&pdev->dev, "couldn't register vibrator to FF\n");
235                 goto err_ialloc;
236         }
237
238         ret = input_register_device(info->input_dev);
239         if (ret < 0) {
240                 dev_dbg(&pdev->dev, "couldn't register input device\n");
241                 goto err_iff;
242         }
243
244         vibra_disable_leds();
245
246         platform_set_drvdata(pdev, info);
247         return 0;
248
249 err_iff:
250         input_ff_destroy(info->input_dev);
251 err_ialloc:
252         input_free_device(info->input_dev);
253 err_kzalloc:
254         kfree(info);
255         return ret;
256 }
257
258 static int __devexit twl4030_vibra_remove(struct platform_device *pdev)
259 {
260         struct vibra_info *info = platform_get_drvdata(pdev);
261
262         /* this also free ff-memless and calls close if needed */
263         input_unregister_device(info->input_dev);
264         kfree(info);
265         platform_set_drvdata(pdev, NULL);
266
267         return 0;
268 }
269
270 static struct platform_driver twl4030_vibra_driver = {
271         .probe          = twl4030_vibra_probe,
272         .remove         = __devexit_p(twl4030_vibra_remove),
273         .driver         = {
274                 .name   = "twl4030_codec_vibra",
275                 .owner  = THIS_MODULE,
276 #ifdef CONFIG_PM
277                 .pm     = &twl4030_vibra_pm_ops,
278 #endif
279         },
280 };
281
282 static int __init twl4030_vibra_init(void)
283 {
284         return platform_driver_register(&twl4030_vibra_driver);
285 }
286 module_init(twl4030_vibra_init);
287
288 static void __exit twl4030_vibra_exit(void)
289 {
290         platform_driver_unregister(&twl4030_vibra_driver);
291 }
292 module_exit(twl4030_vibra_exit);
293
294 MODULE_ALIAS("platform:twl4030_codec_vibra");
295
296 MODULE_DESCRIPTION("TWL4030 Vibra driver");
297 MODULE_LICENSE("GPL");
298 MODULE_AUTHOR("Nokia Corporation");