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Linux/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         if (of_find_node_by_name(node, "codec")) {
187                 of_node_put(node);
188                 return true;
189         }
190 
191         return false;
192 }
193 
194 static int twl4030_vibra_probe(struct platform_device *pdev)
195 {
196         struct twl4030_vibra_data *pdata = dev_get_platdata(&pdev->dev);
197         struct device_node *twl4030_core_node = pdev->dev.parent->of_node;
198         struct vibra_info *info;
199         int ret;
200 
201         if (!pdata && !twl4030_core_node) {
202                 dev_dbg(&pdev->dev, "platform_data not available\n");
203                 return -EINVAL;
204         }
205 
206         info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
207         if (!info)
208                 return -ENOMEM;
209 
210         info->dev = &pdev->dev;
211         info->coexist = twl4030_vibra_check_coexist(pdata, twl4030_core_node);
212         INIT_WORK(&info->play_work, vibra_play_work);
213 
214         info->input_dev = devm_input_allocate_device(&pdev->dev);
215         if (info->input_dev == NULL) {
216                 dev_err(&pdev->dev, "couldn't allocate input device\n");
217                 return -ENOMEM;
218         }
219 
220         input_set_drvdata(info->input_dev, info);
221 
222         info->input_dev->name = "twl4030:vibrator";
223         info->input_dev->id.version = 1;
224         info->input_dev->dev.parent = pdev->dev.parent;
225         info->input_dev->close = twl4030_vibra_close;
226         __set_bit(FF_RUMBLE, info->input_dev->ffbit);
227 
228         ret = input_ff_create_memless(info->input_dev, NULL, vibra_play);
229         if (ret < 0) {
230                 dev_dbg(&pdev->dev, "couldn't register vibrator to FF\n");
231                 return ret;
232         }
233 
234         ret = input_register_device(info->input_dev);
235         if (ret < 0) {
236                 dev_dbg(&pdev->dev, "couldn't register input device\n");
237                 goto err_iff;
238         }
239 
240         vibra_disable_leds();
241 
242         platform_set_drvdata(pdev, info);
243         return 0;
244 
245 err_iff:
246         input_ff_destroy(info->input_dev);
247         return ret;
248 }
249 
250 static struct platform_driver twl4030_vibra_driver = {
251         .probe          = twl4030_vibra_probe,
252         .driver         = {
253                 .name   = "twl4030-vibra",
254                 .pm     = &twl4030_vibra_pm_ops,
255         },
256 };
257 module_platform_driver(twl4030_vibra_driver);
258 
259 MODULE_ALIAS("platform:twl4030-vibra");
260 MODULE_DESCRIPTION("TWL4030 Vibra driver");
261 MODULE_LICENSE("GPL");
262 MODULE_AUTHOR("Nokia Corporation");
263 

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