1 /* 2 * Copyright (C) ST-Ericsson SA 2010 3 * 4 * License Terms: GNU General Public License, version 2 5 * Author: Hanumath Prasad <hanumath.prasad@stericsson.com> for ST-Ericsson 6 * Author: Rabin Vincent <rabin.vincent@stericsson.com> for ST-Ericsson 7 */ 8 9 #include <linux/module.h> 10 #include <linux/interrupt.h> 11 #include <linux/irq.h> 12 #include <linux/slab.h> 13 #include <linux/i2c.h> 14 #include <linux/mfd/core.h> 15 #include <linux/mfd/tc3589x.h> 16 17 #define TC3589x_CLKMODE_MODCTL_SLEEP 0x0 18 #define TC3589x_CLKMODE_MODCTL_OPERATION (1 << 0) 19 20 /** 21 * tc3589x_reg_read() - read a single TC3589x register 22 * @tc3589x: Device to read from 23 * @reg: Register to read 24 */ 25 int tc3589x_reg_read(struct tc3589x *tc3589x, u8 reg) 26 { 27 int ret; 28 29 ret = i2c_smbus_read_byte_data(tc3589x->i2c, reg); 30 if (ret < 0) 31 dev_err(tc3589x->dev, "failed to read reg %#x: %d\n", 32 reg, ret); 33 34 return ret; 35 } 36 EXPORT_SYMBOL_GPL(tc3589x_reg_read); 37 38 /** 39 * tc3589x_reg_read() - write a single TC3589x register 40 * @tc3589x: Device to write to 41 * @reg: Register to read 42 * @data: Value to write 43 */ 44 int tc3589x_reg_write(struct tc3589x *tc3589x, u8 reg, u8 data) 45 { 46 int ret; 47 48 ret = i2c_smbus_write_byte_data(tc3589x->i2c, reg, data); 49 if (ret < 0) 50 dev_err(tc3589x->dev, "failed to write reg %#x: %d\n", 51 reg, ret); 52 53 return ret; 54 } 55 EXPORT_SYMBOL_GPL(tc3589x_reg_write); 56 57 /** 58 * tc3589x_block_read() - read multiple TC3589x registers 59 * @tc3589x: Device to read from 60 * @reg: First register 61 * @length: Number of registers 62 * @values: Buffer to write to 63 */ 64 int tc3589x_block_read(struct tc3589x *tc3589x, u8 reg, u8 length, u8 *values) 65 { 66 int ret; 67 68 ret = i2c_smbus_read_i2c_block_data(tc3589x->i2c, reg, length, values); 69 if (ret < 0) 70 dev_err(tc3589x->dev, "failed to read regs %#x: %d\n", 71 reg, ret); 72 73 return ret; 74 } 75 EXPORT_SYMBOL_GPL(tc3589x_block_read); 76 77 /** 78 * tc3589x_block_write() - write multiple TC3589x registers 79 * @tc3589x: Device to write to 80 * @reg: First register 81 * @length: Number of registers 82 * @values: Values to write 83 */ 84 int tc3589x_block_write(struct tc3589x *tc3589x, u8 reg, u8 length, 85 const u8 *values) 86 { 87 int ret; 88 89 ret = i2c_smbus_write_i2c_block_data(tc3589x->i2c, reg, length, 90 values); 91 if (ret < 0) 92 dev_err(tc3589x->dev, "failed to write regs %#x: %d\n", 93 reg, ret); 94 95 return ret; 96 } 97 EXPORT_SYMBOL_GPL(tc3589x_block_write); 98 99 /** 100 * tc3589x_set_bits() - set the value of a bitfield in a TC3589x register 101 * @tc3589x: Device to write to 102 * @reg: Register to write 103 * @mask: Mask of bits to set 104 * @values: Value to set 105 */ 106 int tc3589x_set_bits(struct tc3589x *tc3589x, u8 reg, u8 mask, u8 val) 107 { 108 int ret; 109 110 mutex_lock(&tc3589x->lock); 111 112 ret = tc3589x_reg_read(tc3589x, reg); 113 if (ret < 0) 114 goto out; 115 116 ret &= ~mask; 117 ret |= val; 118 119 ret = tc3589x_reg_write(tc3589x, reg, ret); 120 121 out: 122 mutex_unlock(&tc3589x->lock); 123 return ret; 124 } 125 EXPORT_SYMBOL_GPL(tc3589x_set_bits); 126 127 static struct resource gpio_resources[] = { 128 { 129 .start = TC3589x_INT_GPIIRQ, 130 .end = TC3589x_INT_GPIIRQ, 131 .flags = IORESOURCE_IRQ, 132 }, 133 }; 134 135 static struct mfd_cell tc3589x_dev_gpio[] = { 136 { 137 .name = "tc3589x-gpio", 138 .num_resources = ARRAY_SIZE(gpio_resources), 139 .resources = &gpio_resources[0], 140 }, 141 }; 142 143 static irqreturn_t tc3589x_irq(int irq, void *data) 144 { 145 struct tc3589x *tc3589x = data; 146 int status; 147 148 again: 149 status = tc3589x_reg_read(tc3589x, TC3589x_IRQST); 150 if (status < 0) 151 return IRQ_NONE; 152 153 while (status) { 154 int bit = __ffs(status); 155 156 handle_nested_irq(tc3589x->irq_base + bit); 157 status &= ~(1 << bit); 158 } 159 160 /* 161 * A dummy read or write (to any register) appears to be necessary to 162 * have the last interrupt clear (for example, GPIO IC write) take 163 * effect. In such a case, recheck for any interrupt which is still 164 * pending. 165 */ 166 status = tc3589x_reg_read(tc3589x, TC3589x_IRQST); 167 if (status) 168 goto again; 169 170 return IRQ_HANDLED; 171 } 172 173 static void tc3589x_irq_dummy(unsigned int irq) 174 { 175 /* No mask/unmask at this level */ 176 } 177 178 static struct irq_chip tc3589x_irq_chip = { 179 .name = "tc3589x", 180 .mask = tc3589x_irq_dummy, 181 .unmask = tc3589x_irq_dummy, 182 }; 183 184 static int tc3589x_irq_init(struct tc3589x *tc3589x) 185 { 186 int base = tc3589x->irq_base; 187 int irq; 188 189 for (irq = base; irq < base + TC3589x_NR_INTERNAL_IRQS; irq++) { 190 set_irq_chip_data(irq, tc3589x); 191 set_irq_chip_and_handler(irq, &tc3589x_irq_chip, 192 handle_edge_irq); 193 set_irq_nested_thread(irq, 1); 194 #ifdef CONFIG_ARM 195 set_irq_flags(irq, IRQF_VALID); 196 #else 197 set_irq_noprobe(irq); 198 #endif 199 } 200 201 return 0; 202 } 203 204 static void tc3589x_irq_remove(struct tc3589x *tc3589x) 205 { 206 int base = tc3589x->irq_base; 207 int irq; 208 209 for (irq = base; irq < base + TC3589x_NR_INTERNAL_IRQS; irq++) { 210 #ifdef CONFIG_ARM 211 set_irq_flags(irq, 0); 212 #endif 213 set_irq_chip_and_handler(irq, NULL, NULL); 214 set_irq_chip_data(irq, NULL); 215 } 216 } 217 218 static int tc3589x_chip_init(struct tc3589x *tc3589x) 219 { 220 int manf, ver, ret; 221 222 manf = tc3589x_reg_read(tc3589x, TC3589x_MANFCODE); 223 if (manf < 0) 224 return manf; 225 226 ver = tc3589x_reg_read(tc3589x, TC3589x_VERSION); 227 if (ver < 0) 228 return ver; 229 230 if (manf != TC3589x_MANFCODE_MAGIC) { 231 dev_err(tc3589x->dev, "unknown manufacturer: %#x\n", manf); 232 return -EINVAL; 233 } 234 235 dev_info(tc3589x->dev, "manufacturer: %#x, version: %#x\n", manf, ver); 236 237 /* 238 * Put everything except the IRQ module into reset; 239 * also spare the GPIO module for any pin initialization 240 * done during pre-kernel boot 241 */ 242 ret = tc3589x_reg_write(tc3589x, TC3589x_RSTCTRL, 243 TC3589x_RSTCTRL_TIMRST 244 | TC3589x_RSTCTRL_ROTRST 245 | TC3589x_RSTCTRL_KBDRST); 246 if (ret < 0) 247 return ret; 248 249 /* Clear the reset interrupt. */ 250 return tc3589x_reg_write(tc3589x, TC3589x_RSTINTCLR, 0x1); 251 } 252 253 static int __devinit tc3589x_device_init(struct tc3589x *tc3589x) 254 { 255 int ret = 0; 256 unsigned int blocks = tc3589x->pdata->block; 257 258 if (blocks & TC3589x_BLOCK_GPIO) { 259 ret = mfd_add_devices(tc3589x->dev, -1, tc3589x_dev_gpio, 260 ARRAY_SIZE(tc3589x_dev_gpio), NULL, 261 tc3589x->irq_base); 262 if (ret) { 263 dev_err(tc3589x->dev, "failed to add gpio child\n"); 264 return ret; 265 } 266 dev_info(tc3589x->dev, "added gpio block\n"); 267 } 268 269 return ret; 270 271 } 272 273 static int __devinit tc3589x_probe(struct i2c_client *i2c, 274 const struct i2c_device_id *id) 275 { 276 struct tc3589x_platform_data *pdata = i2c->dev.platform_data; 277 struct tc3589x *tc3589x; 278 int ret; 279 280 if (!i2c_check_functionality(i2c->adapter, I2C_FUNC_SMBUS_BYTE_DATA 281 | I2C_FUNC_SMBUS_I2C_BLOCK)) 282 return -EIO; 283 284 tc3589x = kzalloc(sizeof(struct tc3589x), GFP_KERNEL); 285 if (!tc3589x) 286 return -ENOMEM; 287 288 mutex_init(&tc3589x->lock); 289 290 tc3589x->dev = &i2c->dev; 291 tc3589x->i2c = i2c; 292 tc3589x->pdata = pdata; 293 tc3589x->irq_base = pdata->irq_base; 294 tc3589x->num_gpio = id->driver_data; 295 296 i2c_set_clientdata(i2c, tc3589x); 297 298 ret = tc3589x_chip_init(tc3589x); 299 if (ret) 300 goto out_free; 301 302 ret = tc3589x_irq_init(tc3589x); 303 if (ret) 304 goto out_free; 305 306 ret = request_threaded_irq(tc3589x->i2c->irq, NULL, tc3589x_irq, 307 IRQF_TRIGGER_FALLING | IRQF_ONESHOT, 308 "tc3589x", tc3589x); 309 if (ret) { 310 dev_err(tc3589x->dev, "failed to request IRQ: %d\n", ret); 311 goto out_removeirq; 312 } 313 314 ret = tc3589x_device_init(tc3589x); 315 if (ret) { 316 dev_err(tc3589x->dev, "failed to add child devices\n"); 317 goto out_freeirq; 318 } 319 320 return 0; 321 322 out_freeirq: 323 free_irq(tc3589x->i2c->irq, tc3589x); 324 out_removeirq: 325 tc3589x_irq_remove(tc3589x); 326 out_free: 327 kfree(tc3589x); 328 return ret; 329 } 330 331 static int __devexit tc3589x_remove(struct i2c_client *client) 332 { 333 struct tc3589x *tc3589x = i2c_get_clientdata(client); 334 335 mfd_remove_devices(tc3589x->dev); 336 337 free_irq(tc3589x->i2c->irq, tc3589x); 338 tc3589x_irq_remove(tc3589x); 339 340 kfree(tc3589x); 341 342 return 0; 343 } 344 345 static int tc3589x_suspend(struct device *dev) 346 { 347 struct tc3589x *tc3589x = dev_get_drvdata(dev); 348 struct i2c_client *client = tc3589x->i2c; 349 int ret = 0; 350 351 /* put the system to sleep mode */ 352 if (!device_may_wakeup(&client->dev)) 353 ret = tc3589x_reg_write(tc3589x, TC3589x_CLKMODE, 354 TC3589x_CLKMODE_MODCTL_SLEEP); 355 356 return ret; 357 } 358 359 static int tc3589x_resume(struct device *dev) 360 { 361 struct tc3589x *tc3589x = dev_get_drvdata(dev); 362 struct i2c_client *client = tc3589x->i2c; 363 int ret = 0; 364 365 /* enable the system into operation */ 366 if (!device_may_wakeup(&client->dev)) 367 ret = tc3589x_reg_write(tc3589x, TC3589x_CLKMODE, 368 TC3589x_CLKMODE_MODCTL_OPERATION); 369 370 return ret; 371 } 372 373 static const SIMPLE_DEV_PM_OPS(tc3589x_dev_pm_ops, tc3589x_suspend, 374 tc3589x_resume); 375 376 static const struct i2c_device_id tc3589x_id[] = { 377 { "tc3589x", 24 }, 378 { } 379 }; 380 MODULE_DEVICE_TABLE(i2c, tc3589x_id); 381 382 static struct i2c_driver tc3589x_driver = { 383 .driver.name = "tc3589x", 384 .driver.owner = THIS_MODULE, 385 #ifdef CONFIG_PM 386 .driver.pm = &tc3589x_dev_pm_ops, 387 #endif 388 .probe = tc3589x_probe, 389 .remove = __devexit_p(tc3589x_remove), 390 .id_table = tc3589x_id, 391 }; 392 393 static int __init tc3589x_init(void) 394 { 395 return i2c_add_driver(&tc3589x_driver); 396 } 397 subsys_initcall(tc3589x_init); 398 399 static void __exit tc3589x_exit(void) 400 { 401 i2c_del_driver(&tc3589x_driver); 402 } 403 module_exit(tc3589x_exit); 404 405 MODULE_LICENSE("GPL v2"); 406 MODULE_DESCRIPTION("TC3589x MFD core driver"); 407 MODULE_AUTHOR("Hanumath Prasad, Rabin Vincent"); 408