Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[sfrench/cifs-2.6.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/of.h>
30 #include <linux/workqueue.h>
31 #include <linux/i2c/twl.h>
32 #include <linux/mfd/twl4030-audio.h>
33 #include <linux/input.h>
34 #include <linux/slab.h>
35
36 /* MODULE ID2 */
37 #define LEDEN           0x00
38
39 /* ForceFeedback */
40 #define EFFECT_DIR_180_DEG      0x8000 /* range is 0 - 0xFFFF */
41
42 struct vibra_info {
43         struct device           *dev;
44         struct input_dev        *input_dev;
45
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_audio_enable_resource(TWL4030_AUDIO_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_audio_enable_resource(TWL4030_AUDIO_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_audio_disable_resource(TWL4030_AUDIO_RES_APLL);
94         twl4030_audio_disable_resource(TWL4030_AUDIO_RES_POWER);
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         schedule_work(&info->play_work);
146         return 0;
147 }
148
149 static void twl4030_vibra_close(struct input_dev *input)
150 {
151         struct vibra_info *info = input_get_drvdata(input);
152
153         cancel_work_sync(&info->play_work);
154
155         if (info->enabled)
156                 vibra_disable(info);
157 }
158
159 /*** Module ***/
160 static int __maybe_unused twl4030_vibra_suspend(struct device *dev)
161 {
162         struct platform_device *pdev = to_platform_device(dev);
163         struct vibra_info *info = platform_get_drvdata(pdev);
164
165         if (info->enabled)
166                 vibra_disable(info);
167
168         return 0;
169 }
170
171 static int __maybe_unused twl4030_vibra_resume(struct device *dev)
172 {
173         vibra_disable_leds();
174         return 0;
175 }
176
177 static SIMPLE_DEV_PM_OPS(twl4030_vibra_pm_ops,
178                          twl4030_vibra_suspend, twl4030_vibra_resume);
179
180 static bool twl4030_vibra_check_coexist(struct twl4030_vibra_data *pdata,
181                               struct device_node *node)
182 {
183         if (pdata && pdata->coexist)
184                 return true;
185
186         node = of_find_node_by_name(node, "codec");
187         if (node) {
188                 of_node_put(node);
189                 return true;
190         }
191
192         return false;
193 }
194
195 static int twl4030_vibra_probe(struct platform_device *pdev)
196 {
197         struct twl4030_vibra_data *pdata = dev_get_platdata(&pdev->dev);
198         struct device_node *twl4030_core_node = pdev->dev.parent->of_node;
199         struct vibra_info *info;
200         int ret;
201
202         if (!pdata && !twl4030_core_node) {
203                 dev_dbg(&pdev->dev, "platform_data not available\n");
204                 return -EINVAL;
205         }
206
207         info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
208         if (!info)
209                 return -ENOMEM;
210
211         info->dev = &pdev->dev;
212         info->coexist = twl4030_vibra_check_coexist(pdata, twl4030_core_node);
213         INIT_WORK(&info->play_work, vibra_play_work);
214
215         info->input_dev = devm_input_allocate_device(&pdev->dev);
216         if (info->input_dev == NULL) {
217                 dev_err(&pdev->dev, "couldn't allocate input device\n");
218                 return -ENOMEM;
219         }
220
221         input_set_drvdata(info->input_dev, info);
222
223         info->input_dev->name = "twl4030:vibrator";
224         info->input_dev->id.version = 1;
225         info->input_dev->dev.parent = pdev->dev.parent;
226         info->input_dev->close = twl4030_vibra_close;
227         __set_bit(FF_RUMBLE, info->input_dev->ffbit);
228
229         ret = input_ff_create_memless(info->input_dev, NULL, vibra_play);
230         if (ret < 0) {
231                 dev_dbg(&pdev->dev, "couldn't register vibrator to FF\n");
232                 return ret;
233         }
234
235         ret = input_register_device(info->input_dev);
236         if (ret < 0) {
237                 dev_dbg(&pdev->dev, "couldn't register input device\n");
238                 goto err_iff;
239         }
240
241         vibra_disable_leds();
242
243         platform_set_drvdata(pdev, info);
244         return 0;
245
246 err_iff:
247         input_ff_destroy(info->input_dev);
248         return ret;
249 }
250
251 static struct platform_driver twl4030_vibra_driver = {
252         .probe          = twl4030_vibra_probe,
253         .driver         = {
254                 .name   = "twl4030-vibra",
255                 .pm     = &twl4030_vibra_pm_ops,
256         },
257 };
258 module_platform_driver(twl4030_vibra_driver);
259
260 MODULE_ALIAS("platform:twl4030-vibra");
261 MODULE_DESCRIPTION("TWL4030 Vibra driver");
262 MODULE_LICENSE("GPL");
263 MODULE_AUTHOR("Nokia Corporation");