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-audio.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, ®, 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 ®, 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 ®, 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 ®, 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 ®, 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_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-vibra", 275 .owner = THIS_MODULE, 276 #ifdef CONFIG_PM 277 .pm = &twl4030_vibra_pm_ops, 278 #endif 279 }, 280 }; 281 module_platform_driver(twl4030_vibra_driver); 282 283 MODULE_ALIAS("platform:twl4030-vibra"); 284 MODULE_DESCRIPTION("TWL4030 Vibra driver"); 285 MODULE_LICENSE("GPL"); 286 MODULE_AUTHOR("Nokia Corporation"); 287