1 /* 2 * DRV2665 haptics driver family 3 * 4 * Author: Dan Murphy <dmurphy@ti.com> 5 * 6 * Copyright: (C) 2015 Texas Instruments, Inc. 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License version 2 as 10 * published by the Free Software Foundation. 11 * 12 * This program is distributed in the hope that it will be useful, but 13 * WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * General Public License for more details. 16 */ 17 18 #include <linux/i2c.h> 19 #include <linux/input.h> 20 #include <linux/module.h> 21 #include <linux/regmap.h> 22 #include <linux/slab.h> 23 #include <linux/delay.h> 24 #include <linux/regulator/consumer.h> 25 26 /* Contol registers */ 27 #define DRV2665_STATUS 0x00 28 #define DRV2665_CTRL_1 0x01 29 #define DRV2665_CTRL_2 0x02 30 #define DRV2665_FIFO 0x0b 31 32 /* Status Register */ 33 #define DRV2665_FIFO_FULL BIT(0) 34 #define DRV2665_FIFO_EMPTY BIT(1) 35 36 /* Control 1 Register */ 37 #define DRV2665_25_VPP_GAIN 0x00 38 #define DRV2665_50_VPP_GAIN 0x01 39 #define DRV2665_75_VPP_GAIN 0x02 40 #define DRV2665_100_VPP_GAIN 0x03 41 #define DRV2665_DIGITAL_IN 0xfc 42 #define DRV2665_ANALOG_IN BIT(2) 43 44 /* Control 2 Register */ 45 #define DRV2665_BOOST_EN BIT(1) 46 #define DRV2665_STANDBY BIT(6) 47 #define DRV2665_DEV_RST BIT(7) 48 #define DRV2665_5_MS_IDLE_TOUT 0x00 49 #define DRV2665_10_MS_IDLE_TOUT 0x04 50 #define DRV2665_15_MS_IDLE_TOUT 0x08 51 #define DRV2665_20_MS_IDLE_TOUT 0x0c 52 53 /** 54 * struct drv2665_data - 55 * @input_dev - Pointer to the input device 56 * @client - Pointer to the I2C client 57 * @regmap - Register map of the device 58 * @work - Work item used to off load the enable/disable of the vibration 59 * @regulator - Pointer to the regulator for the IC 60 */ 61 struct drv2665_data { 62 struct input_dev *input_dev; 63 struct i2c_client *client; 64 struct regmap *regmap; 65 struct work_struct work; 66 struct regulator *regulator; 67 }; 68 69 /* 8kHz Sine wave to stream to the FIFO */ 70 static const u8 drv2665_sine_wave_form[] = { 71 0x00, 0x10, 0x20, 0x2e, 0x3c, 0x48, 0x53, 0x5b, 0x61, 0x65, 0x66, 72 0x65, 0x61, 0x5b, 0x53, 0x48, 0x3c, 0x2e, 0x20, 0x10, 73 0x00, 0xf0, 0xe0, 0xd2, 0xc4, 0xb8, 0xad, 0xa5, 0x9f, 0x9b, 0x9a, 74 0x9b, 0x9f, 0xa5, 0xad, 0xb8, 0xc4, 0xd2, 0xe0, 0xf0, 0x00, 75 }; 76 77 static const struct reg_default drv2665_reg_defs[] = { 78 { DRV2665_STATUS, 0x02 }, 79 { DRV2665_CTRL_1, 0x28 }, 80 { DRV2665_CTRL_2, 0x40 }, 81 { DRV2665_FIFO, 0x00 }, 82 }; 83 84 static void drv2665_worker(struct work_struct *work) 85 { 86 struct drv2665_data *haptics = 87 container_of(work, struct drv2665_data, work); 88 unsigned int read_buf; 89 int error; 90 91 error = regmap_read(haptics->regmap, DRV2665_STATUS, &read_buf); 92 if (error) { 93 dev_err(&haptics->client->dev, 94 "Failed to read status: %d\n", error); 95 return; 96 } 97 98 if (read_buf & DRV2665_FIFO_EMPTY) { 99 error = regmap_bulk_write(haptics->regmap, 100 DRV2665_FIFO, 101 drv2665_sine_wave_form, 102 ARRAY_SIZE(drv2665_sine_wave_form)); 103 if (error) { 104 dev_err(&haptics->client->dev, 105 "Failed to write FIFO: %d\n", error); 106 return; 107 } 108 } 109 } 110 111 static int drv2665_haptics_play(struct input_dev *input, void *data, 112 struct ff_effect *effect) 113 { 114 struct drv2665_data *haptics = input_get_drvdata(input); 115 116 schedule_work(&haptics->work); 117 118 return 0; 119 } 120 121 static void drv2665_close(struct input_dev *input) 122 { 123 struct drv2665_data *haptics = input_get_drvdata(input); 124 int error; 125 126 cancel_work_sync(&haptics->work); 127 128 error = regmap_update_bits(haptics->regmap, 129 DRV2665_CTRL_2, DRV2665_STANDBY, 1); 130 if (error) 131 dev_err(&haptics->client->dev, 132 "Failed to enter standby mode: %d\n", error); 133 } 134 135 static const struct reg_sequence drv2665_init_regs[] = { 136 { DRV2665_CTRL_2, 0 | DRV2665_10_MS_IDLE_TOUT }, 137 { DRV2665_CTRL_1, DRV2665_25_VPP_GAIN }, 138 }; 139 140 static int drv2665_init(struct drv2665_data *haptics) 141 { 142 int error; 143 144 error = regmap_register_patch(haptics->regmap, 145 drv2665_init_regs, 146 ARRAY_SIZE(drv2665_init_regs)); 147 if (error) { 148 dev_err(&haptics->client->dev, 149 "Failed to write init registers: %d\n", 150 error); 151 return error; 152 } 153 154 return 0; 155 } 156 157 static const struct regmap_config drv2665_regmap_config = { 158 .reg_bits = 8, 159 .val_bits = 8, 160 161 .max_register = DRV2665_FIFO, 162 .reg_defaults = drv2665_reg_defs, 163 .num_reg_defaults = ARRAY_SIZE(drv2665_reg_defs), 164 .cache_type = REGCACHE_NONE, 165 }; 166 167 static int drv2665_probe(struct i2c_client *client, 168 const struct i2c_device_id *id) 169 { 170 struct drv2665_data *haptics; 171 int error; 172 173 haptics = devm_kzalloc(&client->dev, sizeof(*haptics), GFP_KERNEL); 174 if (!haptics) 175 return -ENOMEM; 176 177 haptics->regulator = devm_regulator_get(&client->dev, "vbat"); 178 if (IS_ERR(haptics->regulator)) { 179 error = PTR_ERR(haptics->regulator); 180 dev_err(&client->dev, 181 "unable to get regulator, error: %d\n", error); 182 return error; 183 } 184 185 haptics->input_dev = devm_input_allocate_device(&client->dev); 186 if (!haptics->input_dev) { 187 dev_err(&client->dev, "Failed to allocate input device\n"); 188 return -ENOMEM; 189 } 190 191 haptics->input_dev->name = "drv2665:haptics"; 192 haptics->input_dev->dev.parent = client->dev.parent; 193 haptics->input_dev->close = drv2665_close; 194 input_set_drvdata(haptics->input_dev, haptics); 195 input_set_capability(haptics->input_dev, EV_FF, FF_RUMBLE); 196 197 error = input_ff_create_memless(haptics->input_dev, NULL, 198 drv2665_haptics_play); 199 if (error) { 200 dev_err(&client->dev, "input_ff_create() failed: %d\n", 201 error); 202 return error; 203 } 204 205 INIT_WORK(&haptics->work, drv2665_worker); 206 207 haptics->client = client; 208 i2c_set_clientdata(client, haptics); 209 210 haptics->regmap = devm_regmap_init_i2c(client, &drv2665_regmap_config); 211 if (IS_ERR(haptics->regmap)) { 212 error = PTR_ERR(haptics->regmap); 213 dev_err(&client->dev, "Failed to allocate register map: %d\n", 214 error); 215 return error; 216 } 217 218 error = drv2665_init(haptics); 219 if (error) { 220 dev_err(&client->dev, "Device init failed: %d\n", error); 221 return error; 222 } 223 224 error = input_register_device(haptics->input_dev); 225 if (error) { 226 dev_err(&client->dev, "couldn't register input device: %d\n", 227 error); 228 return error; 229 } 230 231 return 0; 232 } 233 234 static int __maybe_unused drv2665_suspend(struct device *dev) 235 { 236 struct drv2665_data *haptics = dev_get_drvdata(dev); 237 int ret = 0; 238 239 mutex_lock(&haptics->input_dev->mutex); 240 241 if (haptics->input_dev->users) { 242 ret = regmap_update_bits(haptics->regmap, DRV2665_CTRL_2, 243 DRV2665_STANDBY, 1); 244 if (ret) { 245 dev_err(dev, "Failed to set standby mode\n"); 246 regulator_disable(haptics->regulator); 247 goto out; 248 } 249 250 ret = regulator_disable(haptics->regulator); 251 if (ret) { 252 dev_err(dev, "Failed to disable regulator\n"); 253 regmap_update_bits(haptics->regmap, 254 DRV2665_CTRL_2, 255 DRV2665_STANDBY, 0); 256 } 257 } 258 out: 259 mutex_unlock(&haptics->input_dev->mutex); 260 return ret; 261 } 262 263 static int __maybe_unused drv2665_resume(struct device *dev) 264 { 265 struct drv2665_data *haptics = dev_get_drvdata(dev); 266 int ret = 0; 267 268 mutex_lock(&haptics->input_dev->mutex); 269 270 if (haptics->input_dev->users) { 271 ret = regulator_enable(haptics->regulator); 272 if (ret) { 273 dev_err(dev, "Failed to enable regulator\n"); 274 goto out; 275 } 276 277 ret = regmap_update_bits(haptics->regmap, DRV2665_CTRL_2, 278 DRV2665_STANDBY, 0); 279 if (ret) { 280 dev_err(dev, "Failed to unset standby mode\n"); 281 regulator_disable(haptics->regulator); 282 goto out; 283 } 284 285 } 286 287 out: 288 mutex_unlock(&haptics->input_dev->mutex); 289 return ret; 290 } 291 292 static SIMPLE_DEV_PM_OPS(drv2665_pm_ops, drv2665_suspend, drv2665_resume); 293 294 static const struct i2c_device_id drv2665_id[] = { 295 { "drv2665", 0 }, 296 { } 297 }; 298 MODULE_DEVICE_TABLE(i2c, drv2665_id); 299 300 #ifdef CONFIG_OF 301 static const struct of_device_id drv2665_of_match[] = { 302 { .compatible = "ti,drv2665", }, 303 { } 304 }; 305 MODULE_DEVICE_TABLE(of, drv2665_of_match); 306 #endif 307 308 static struct i2c_driver drv2665_driver = { 309 .probe = drv2665_probe, 310 .driver = { 311 .name = "drv2665-haptics", 312 .of_match_table = of_match_ptr(drv2665_of_match), 313 .pm = &drv2665_pm_ops, 314 }, 315 .id_table = drv2665_id, 316 }; 317 module_i2c_driver(drv2665_driver); 318 319 MODULE_DESCRIPTION("TI DRV2665 haptics driver"); 320 MODULE_LICENSE("GPL"); 321 MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com>"); 322