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 workqueue_struct *workqueue; 47 struct work_struct play_work; 48 49 bool enabled; 50 int speed; 51 int direction; 52 53 bool coexist; 54 }; 55 56 static void vibra_disable_leds(void) 57 { 58 u8 reg; 59 60 /* Disable LEDA & LEDB, cannot be used with vibra (PWM) */ 61 twl_i2c_read_u8(TWL4030_MODULE_LED, ®, LEDEN); 62 reg &= ~0x03; 63 twl_i2c_write_u8(TWL4030_MODULE_LED, LEDEN, reg); 64 } 65 66 /* Powers H-Bridge and enables audio clk */ 67 static void vibra_enable(struct vibra_info *info) 68 { 69 u8 reg; 70 71 twl4030_audio_enable_resource(TWL4030_AUDIO_RES_POWER); 72 73 /* turn H-Bridge on */ 74 twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE, 75 ®, TWL4030_REG_VIBRA_CTL); 76 twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE, 77 (reg | TWL4030_VIBRA_EN), TWL4030_REG_VIBRA_CTL); 78 79 twl4030_audio_enable_resource(TWL4030_AUDIO_RES_APLL); 80 81 info->enabled = true; 82 } 83 84 static void vibra_disable(struct vibra_info *info) 85 { 86 u8 reg; 87 88 /* Power down H-Bridge */ 89 twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE, 90 ®, TWL4030_REG_VIBRA_CTL); 91 twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE, 92 (reg & ~TWL4030_VIBRA_EN), TWL4030_REG_VIBRA_CTL); 93 94 twl4030_audio_disable_resource(TWL4030_AUDIO_RES_APLL); 95 twl4030_audio_disable_resource(TWL4030_AUDIO_RES_POWER); 96 97 info->enabled = false; 98 } 99 100 static void vibra_play_work(struct work_struct *work) 101 { 102 struct vibra_info *info = container_of(work, 103 struct vibra_info, play_work); 104 int dir; 105 int pwm; 106 u8 reg; 107 108 dir = info->direction; 109 pwm = info->speed; 110 111 twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE, 112 ®, TWL4030_REG_VIBRA_CTL); 113 if (pwm && (!info->coexist || !(reg & TWL4030_VIBRA_SEL))) { 114 115 if (!info->enabled) 116 vibra_enable(info); 117 118 /* set vibra rotation direction */ 119 twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE, 120 ®, TWL4030_REG_VIBRA_CTL); 121 reg = (dir) ? (reg | TWL4030_VIBRA_DIR) : 122 (reg & ~TWL4030_VIBRA_DIR); 123 twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE, 124 reg, TWL4030_REG_VIBRA_CTL); 125 126 /* set PWM, 1 = max, 255 = min */ 127 twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE, 128 256 - pwm, TWL4030_REG_VIBRA_SET); 129 } else { 130 if (info->enabled) 131 vibra_disable(info); 132 } 133 } 134 135 /*** Input/ForceFeedback ***/ 136 137 static int vibra_play(struct input_dev *input, void *data, 138 struct ff_effect *effect) 139 { 140 struct vibra_info *info = input_get_drvdata(input); 141 142 info->speed = effect->u.rumble.strong_magnitude >> 8; 143 if (!info->speed) 144 info->speed = effect->u.rumble.weak_magnitude >> 9; 145 info->direction = effect->direction < EFFECT_DIR_180_DEG ? 0 : 1; 146 queue_work(info->workqueue, &info->play_work); 147 return 0; 148 } 149 150 static int twl4030_vibra_open(struct input_dev *input) 151 { 152 struct vibra_info *info = input_get_drvdata(input); 153 154 info->workqueue = create_singlethread_workqueue("vibra"); 155 if (info->workqueue == NULL) { 156 dev_err(&input->dev, "couldn't create workqueue\n"); 157 return -ENOMEM; 158 } 159 return 0; 160 } 161 162 static void twl4030_vibra_close(struct input_dev *input) 163 { 164 struct vibra_info *info = input_get_drvdata(input); 165 166 cancel_work_sync(&info->play_work); 167 INIT_WORK(&info->play_work, vibra_play_work); /* cleanup */ 168 destroy_workqueue(info->workqueue); 169 info->workqueue = NULL; 170 171 if (info->enabled) 172 vibra_disable(info); 173 } 174 175 /*** Module ***/ 176 #ifdef CONFIG_PM_SLEEP 177 static int twl4030_vibra_suspend(struct device *dev) 178 { 179 struct platform_device *pdev = to_platform_device(dev); 180 struct vibra_info *info = platform_get_drvdata(pdev); 181 182 if (info->enabled) 183 vibra_disable(info); 184 185 return 0; 186 } 187 188 static int twl4030_vibra_resume(struct device *dev) 189 { 190 vibra_disable_leds(); 191 return 0; 192 } 193 #endif 194 195 static SIMPLE_DEV_PM_OPS(twl4030_vibra_pm_ops, 196 twl4030_vibra_suspend, twl4030_vibra_resume); 197 198 static bool twl4030_vibra_check_coexist(struct twl4030_vibra_data *pdata, 199 struct device_node *node) 200 { 201 if (pdata && pdata->coexist) 202 return true; 203 204 if (of_find_node_by_name(node, "codec")) 205 return true; 206 207 return false; 208 } 209 210 static int twl4030_vibra_probe(struct platform_device *pdev) 211 { 212 struct twl4030_vibra_data *pdata = pdev->dev.platform_data; 213 struct device_node *twl4030_core_node = pdev->dev.parent->of_node; 214 struct vibra_info *info; 215 int ret; 216 217 if (!pdata && !twl4030_core_node) { 218 dev_dbg(&pdev->dev, "platform_data not available\n"); 219 return -EINVAL; 220 } 221 222 info = kzalloc(sizeof(*info), GFP_KERNEL); 223 if (!info) 224 return -ENOMEM; 225 226 info->dev = &pdev->dev; 227 info->coexist = twl4030_vibra_check_coexist(pdata, twl4030_core_node); 228 INIT_WORK(&info->play_work, vibra_play_work); 229 230 info->input_dev = input_allocate_device(); 231 if (info->input_dev == NULL) { 232 dev_err(&pdev->dev, "couldn't allocate input device\n"); 233 ret = -ENOMEM; 234 goto err_kzalloc; 235 } 236 237 input_set_drvdata(info->input_dev, info); 238 239 info->input_dev->name = "twl4030:vibrator"; 240 info->input_dev->id.version = 1; 241 info->input_dev->dev.parent = pdev->dev.parent; 242 info->input_dev->open = twl4030_vibra_open; 243 info->input_dev->close = twl4030_vibra_close; 244 __set_bit(FF_RUMBLE, info->input_dev->ffbit); 245 246 ret = input_ff_create_memless(info->input_dev, NULL, vibra_play); 247 if (ret < 0) { 248 dev_dbg(&pdev->dev, "couldn't register vibrator to FF\n"); 249 goto err_ialloc; 250 } 251 252 ret = input_register_device(info->input_dev); 253 if (ret < 0) { 254 dev_dbg(&pdev->dev, "couldn't register input device\n"); 255 goto err_iff; 256 } 257 258 vibra_disable_leds(); 259 260 platform_set_drvdata(pdev, info); 261 return 0; 262 263 err_iff: 264 input_ff_destroy(info->input_dev); 265 err_ialloc: 266 input_free_device(info->input_dev); 267 err_kzalloc: 268 kfree(info); 269 return ret; 270 } 271 272 static int __devexit twl4030_vibra_remove(struct platform_device *pdev) 273 { 274 struct vibra_info *info = platform_get_drvdata(pdev); 275 276 /* this also free ff-memless and calls close if needed */ 277 input_unregister_device(info->input_dev); 278 kfree(info); 279 platform_set_drvdata(pdev, NULL); 280 281 return 0; 282 } 283 284 static struct platform_driver twl4030_vibra_driver = { 285 .probe = twl4030_vibra_probe, 286 .remove = twl4030_vibra_remove, 287 .driver = { 288 .name = "twl4030-vibra", 289 .owner = THIS_MODULE, 290 .pm = &twl4030_vibra_pm_ops, 291 }, 292 }; 293 module_platform_driver(twl4030_vibra_driver); 294 295 MODULE_ALIAS("platform:twl4030-vibra"); 296 MODULE_DESCRIPTION("TWL4030 Vibra driver"); 297 MODULE_LICENSE("GPL"); 298 MODULE_AUTHOR("Nokia Corporation"); 299