1 /* NXP PCF50633 Power Management Unit (PMU) driver 2 * 3 * (C) 2006-2008 by Openmoko, Inc. 4 * Author: Harald Welte <laforge@openmoko.org> 5 * Balaji Rao <balajirrao@openmoko.org> 6 * All rights reserved. 7 * 8 * This program is free software; you can redistribute it and/or modify it 9 * under the terms of the GNU General Public License as published by the 10 * Free Software Foundation; either version 2 of the License, or (at your 11 * option) any later version. 12 * 13 */ 14 15 #include <linux/kernel.h> 16 #include <linux/device.h> 17 #include <linux/sysfs.h> 18 #include <linux/module.h> 19 #include <linux/types.h> 20 #include <linux/interrupt.h> 21 #include <linux/workqueue.h> 22 #include <linux/platform_device.h> 23 #include <linux/i2c.h> 24 #include <linux/slab.h> 25 26 #include <linux/mfd/pcf50633/core.h> 27 28 int pcf50633_irq_init(struct pcf50633 *pcf, int irq); 29 void pcf50633_irq_free(struct pcf50633 *pcf); 30 #ifdef CONFIG_PM 31 int pcf50633_irq_suspend(struct pcf50633 *pcf); 32 int pcf50633_irq_resume(struct pcf50633 *pcf); 33 #endif 34 35 static int __pcf50633_read(struct pcf50633 *pcf, u8 reg, int num, u8 *data) 36 { 37 int ret; 38 39 ret = i2c_smbus_read_i2c_block_data(pcf->i2c_client, reg, 40 num, data); 41 if (ret < 0) 42 dev_err(pcf->dev, "Error reading %d regs at %d\n", num, reg); 43 44 return ret; 45 } 46 47 static int __pcf50633_write(struct pcf50633 *pcf, u8 reg, int num, u8 *data) 48 { 49 int ret; 50 51 ret = i2c_smbus_write_i2c_block_data(pcf->i2c_client, reg, 52 num, data); 53 if (ret < 0) 54 dev_err(pcf->dev, "Error writing %d regs at %d\n", num, reg); 55 56 return ret; 57 58 } 59 60 /* Read a block of upto 32 regs */ 61 int pcf50633_read_block(struct pcf50633 *pcf, u8 reg, 62 int nr_regs, u8 *data) 63 { 64 int ret; 65 66 mutex_lock(&pcf->lock); 67 ret = __pcf50633_read(pcf, reg, nr_regs, data); 68 mutex_unlock(&pcf->lock); 69 70 return ret; 71 } 72 EXPORT_SYMBOL_GPL(pcf50633_read_block); 73 74 /* Write a block of upto 32 regs */ 75 int pcf50633_write_block(struct pcf50633 *pcf , u8 reg, 76 int nr_regs, u8 *data) 77 { 78 int ret; 79 80 mutex_lock(&pcf->lock); 81 ret = __pcf50633_write(pcf, reg, nr_regs, data); 82 mutex_unlock(&pcf->lock); 83 84 return ret; 85 } 86 EXPORT_SYMBOL_GPL(pcf50633_write_block); 87 88 u8 pcf50633_reg_read(struct pcf50633 *pcf, u8 reg) 89 { 90 u8 val; 91 92 mutex_lock(&pcf->lock); 93 __pcf50633_read(pcf, reg, 1, &val); 94 mutex_unlock(&pcf->lock); 95 96 return val; 97 } 98 EXPORT_SYMBOL_GPL(pcf50633_reg_read); 99 100 int pcf50633_reg_write(struct pcf50633 *pcf, u8 reg, u8 val) 101 { 102 int ret; 103 104 mutex_lock(&pcf->lock); 105 ret = __pcf50633_write(pcf, reg, 1, &val); 106 mutex_unlock(&pcf->lock); 107 108 return ret; 109 } 110 EXPORT_SYMBOL_GPL(pcf50633_reg_write); 111 112 int pcf50633_reg_set_bit_mask(struct pcf50633 *pcf, u8 reg, u8 mask, u8 val) 113 { 114 int ret; 115 u8 tmp; 116 117 val &= mask; 118 119 mutex_lock(&pcf->lock); 120 ret = __pcf50633_read(pcf, reg, 1, &tmp); 121 if (ret < 0) 122 goto out; 123 124 tmp &= ~mask; 125 tmp |= val; 126 ret = __pcf50633_write(pcf, reg, 1, &tmp); 127 128 out: 129 mutex_unlock(&pcf->lock); 130 131 return ret; 132 } 133 EXPORT_SYMBOL_GPL(pcf50633_reg_set_bit_mask); 134 135 int pcf50633_reg_clear_bits(struct pcf50633 *pcf, u8 reg, u8 val) 136 { 137 int ret; 138 u8 tmp; 139 140 mutex_lock(&pcf->lock); 141 ret = __pcf50633_read(pcf, reg, 1, &tmp); 142 if (ret < 0) 143 goto out; 144 145 tmp &= ~val; 146 ret = __pcf50633_write(pcf, reg, 1, &tmp); 147 148 out: 149 mutex_unlock(&pcf->lock); 150 151 return ret; 152 } 153 EXPORT_SYMBOL_GPL(pcf50633_reg_clear_bits); 154 155 /* sysfs attributes */ 156 static ssize_t show_dump_regs(struct device *dev, struct device_attribute *attr, 157 char *buf) 158 { 159 struct pcf50633 *pcf = dev_get_drvdata(dev); 160 u8 dump[16]; 161 int n, n1, idx = 0; 162 char *buf1 = buf; 163 static u8 address_no_read[] = { /* must be ascending */ 164 PCF50633_REG_INT1, 165 PCF50633_REG_INT2, 166 PCF50633_REG_INT3, 167 PCF50633_REG_INT4, 168 PCF50633_REG_INT5, 169 0 /* terminator */ 170 }; 171 172 for (n = 0; n < 256; n += sizeof(dump)) { 173 for (n1 = 0; n1 < sizeof(dump); n1++) 174 if (n == address_no_read[idx]) { 175 idx++; 176 dump[n1] = 0x00; 177 } else 178 dump[n1] = pcf50633_reg_read(pcf, n + n1); 179 180 hex_dump_to_buffer(dump, sizeof(dump), 16, 1, buf1, 128, 0); 181 buf1 += strlen(buf1); 182 *buf1++ = '\n'; 183 *buf1 = '\0'; 184 } 185 186 return buf1 - buf; 187 } 188 static DEVICE_ATTR(dump_regs, 0400, show_dump_regs, NULL); 189 190 static ssize_t show_resume_reason(struct device *dev, 191 struct device_attribute *attr, char *buf) 192 { 193 struct pcf50633 *pcf = dev_get_drvdata(dev); 194 int n; 195 196 n = sprintf(buf, "%02x%02x%02x%02x%02x\n", 197 pcf->resume_reason[0], 198 pcf->resume_reason[1], 199 pcf->resume_reason[2], 200 pcf->resume_reason[3], 201 pcf->resume_reason[4]); 202 203 return n; 204 } 205 static DEVICE_ATTR(resume_reason, 0400, show_resume_reason, NULL); 206 207 static struct attribute *pcf_sysfs_entries[] = { 208 &dev_attr_dump_regs.attr, 209 &dev_attr_resume_reason.attr, 210 NULL, 211 }; 212 213 static struct attribute_group pcf_attr_group = { 214 .name = NULL, /* put in device directory */ 215 .attrs = pcf_sysfs_entries, 216 }; 217 218 static void 219 pcf50633_client_dev_register(struct pcf50633 *pcf, const char *name, 220 struct platform_device **pdev) 221 { 222 int ret; 223 224 *pdev = platform_device_alloc(name, -1); 225 if (!*pdev) { 226 dev_err(pcf->dev, "Falied to allocate %s\n", name); 227 return; 228 } 229 230 (*pdev)->dev.parent = pcf->dev; 231 232 ret = platform_device_add(*pdev); 233 if (ret) { 234 dev_err(pcf->dev, "Failed to register %s: %d\n", name, ret); 235 platform_device_put(*pdev); 236 *pdev = NULL; 237 } 238 } 239 240 #ifdef CONFIG_PM 241 static int pcf50633_suspend(struct i2c_client *client, pm_message_t state) 242 { 243 struct pcf50633 *pcf; 244 pcf = i2c_get_clientdata(client); 245 246 return pcf50633_irq_suspend(pcf); 247 } 248 249 static int pcf50633_resume(struct i2c_client *client) 250 { 251 struct pcf50633 *pcf; 252 pcf = i2c_get_clientdata(client); 253 254 return pcf50633_irq_resume(pcf); 255 } 256 #else 257 #define pcf50633_suspend NULL 258 #define pcf50633_resume NULL 259 #endif 260 261 static int __devinit pcf50633_probe(struct i2c_client *client, 262 const struct i2c_device_id *ids) 263 { 264 struct pcf50633 *pcf; 265 struct pcf50633_platform_data *pdata = client->dev.platform_data; 266 int i, ret; 267 int version, variant; 268 269 if (!client->irq) { 270 dev_err(&client->dev, "Missing IRQ\n"); 271 return -ENOENT; 272 } 273 274 pcf = kzalloc(sizeof(*pcf), GFP_KERNEL); 275 if (!pcf) 276 return -ENOMEM; 277 278 pcf->pdata = pdata; 279 280 mutex_init(&pcf->lock); 281 282 i2c_set_clientdata(client, pcf); 283 pcf->dev = &client->dev; 284 pcf->i2c_client = client; 285 286 version = pcf50633_reg_read(pcf, 0); 287 variant = pcf50633_reg_read(pcf, 1); 288 if (version < 0 || variant < 0) { 289 dev_err(pcf->dev, "Unable to probe pcf50633\n"); 290 ret = -ENODEV; 291 goto err_free; 292 } 293 294 dev_info(pcf->dev, "Probed device version %d variant %d\n", 295 version, variant); 296 297 pcf50633_irq_init(pcf, client->irq); 298 299 /* Create sub devices */ 300 pcf50633_client_dev_register(pcf, "pcf50633-input", 301 &pcf->input_pdev); 302 pcf50633_client_dev_register(pcf, "pcf50633-rtc", 303 &pcf->rtc_pdev); 304 pcf50633_client_dev_register(pcf, "pcf50633-mbc", 305 &pcf->mbc_pdev); 306 pcf50633_client_dev_register(pcf, "pcf50633-adc", 307 &pcf->adc_pdev); 308 pcf50633_client_dev_register(pcf, "pcf50633-backlight", 309 &pcf->bl_pdev); 310 311 312 for (i = 0; i < PCF50633_NUM_REGULATORS; i++) { 313 struct platform_device *pdev; 314 315 pdev = platform_device_alloc("pcf50633-regltr", i); 316 if (!pdev) { 317 dev_err(pcf->dev, "Cannot create regulator %d\n", i); 318 continue; 319 } 320 321 pdev->dev.parent = pcf->dev; 322 platform_device_add_data(pdev, &pdata->reg_init_data[i], 323 sizeof(pdata->reg_init_data[i])); 324 pcf->regulator_pdev[i] = pdev; 325 326 platform_device_add(pdev); 327 } 328 329 ret = sysfs_create_group(&client->dev.kobj, &pcf_attr_group); 330 if (ret) 331 dev_err(pcf->dev, "error creating sysfs entries\n"); 332 333 if (pdata->probe_done) 334 pdata->probe_done(pcf); 335 336 return 0; 337 338 err_free: 339 kfree(pcf); 340 341 return ret; 342 } 343 344 static int __devexit pcf50633_remove(struct i2c_client *client) 345 { 346 struct pcf50633 *pcf = i2c_get_clientdata(client); 347 int i; 348 349 pcf50633_irq_free(pcf); 350 351 platform_device_unregister(pcf->input_pdev); 352 platform_device_unregister(pcf->rtc_pdev); 353 platform_device_unregister(pcf->mbc_pdev); 354 platform_device_unregister(pcf->adc_pdev); 355 356 for (i = 0; i < PCF50633_NUM_REGULATORS; i++) 357 platform_device_unregister(pcf->regulator_pdev[i]); 358 359 kfree(pcf); 360 361 return 0; 362 } 363 364 static struct i2c_device_id pcf50633_id_table[] = { 365 {"pcf50633", 0x73}, 366 {/* end of list */} 367 }; 368 369 static struct i2c_driver pcf50633_driver = { 370 .driver = { 371 .name = "pcf50633", 372 }, 373 .id_table = pcf50633_id_table, 374 .probe = pcf50633_probe, 375 .remove = __devexit_p(pcf50633_remove), 376 .suspend = pcf50633_suspend, 377 .resume = pcf50633_resume, 378 }; 379 380 static int __init pcf50633_init(void) 381 { 382 return i2c_add_driver(&pcf50633_driver); 383 } 384 385 static void __exit pcf50633_exit(void) 386 { 387 i2c_del_driver(&pcf50633_driver); 388 } 389 390 MODULE_DESCRIPTION("I2C chip driver for NXP PCF50633 PMU"); 391 MODULE_AUTHOR("Harald Welte <laforge@openmoko.org>"); 392 MODULE_LICENSE("GPL"); 393 394 subsys_initcall(pcf50633_init); 395 module_exit(pcf50633_exit); 396