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/pm.h> 25 #include <linux/slab.h> 26 #include <linux/regmap.h> 27 #include <linux/err.h> 28 29 #include <linux/mfd/pcf50633/core.h> 30 31 /* Read a block of up to 32 regs */ 32 int pcf50633_read_block(struct pcf50633 *pcf, u8 reg, 33 int nr_regs, u8 *data) 34 { 35 int ret; 36 37 ret = regmap_raw_read(pcf->regmap, reg, data, nr_regs); 38 if (ret != 0) 39 return ret; 40 41 return nr_regs; 42 } 43 EXPORT_SYMBOL_GPL(pcf50633_read_block); 44 45 /* Write a block of up to 32 regs */ 46 int pcf50633_write_block(struct pcf50633 *pcf , u8 reg, 47 int nr_regs, u8 *data) 48 { 49 int ret; 50 51 ret = regmap_raw_write(pcf->regmap, reg, data, nr_regs); 52 if (ret != 0) 53 return ret; 54 55 return nr_regs; 56 } 57 EXPORT_SYMBOL_GPL(pcf50633_write_block); 58 59 u8 pcf50633_reg_read(struct pcf50633 *pcf, u8 reg) 60 { 61 unsigned int val; 62 int ret; 63 64 ret = regmap_read(pcf->regmap, reg, &val); 65 if (ret < 0) 66 return -1; 67 68 return val; 69 } 70 EXPORT_SYMBOL_GPL(pcf50633_reg_read); 71 72 int pcf50633_reg_write(struct pcf50633 *pcf, u8 reg, u8 val) 73 { 74 return regmap_write(pcf->regmap, reg, val); 75 } 76 EXPORT_SYMBOL_GPL(pcf50633_reg_write); 77 78 int pcf50633_reg_set_bit_mask(struct pcf50633 *pcf, u8 reg, u8 mask, u8 val) 79 { 80 return regmap_update_bits(pcf->regmap, reg, mask, val); 81 } 82 EXPORT_SYMBOL_GPL(pcf50633_reg_set_bit_mask); 83 84 int pcf50633_reg_clear_bits(struct pcf50633 *pcf, u8 reg, u8 val) 85 { 86 return regmap_update_bits(pcf->regmap, reg, val, 0); 87 } 88 EXPORT_SYMBOL_GPL(pcf50633_reg_clear_bits); 89 90 /* sysfs attributes */ 91 static ssize_t show_dump_regs(struct device *dev, struct device_attribute *attr, 92 char *buf) 93 { 94 struct pcf50633 *pcf = dev_get_drvdata(dev); 95 u8 dump[16]; 96 int n, n1, idx = 0; 97 char *buf1 = buf; 98 static u8 address_no_read[] = { /* must be ascending */ 99 PCF50633_REG_INT1, 100 PCF50633_REG_INT2, 101 PCF50633_REG_INT3, 102 PCF50633_REG_INT4, 103 PCF50633_REG_INT5, 104 0 /* terminator */ 105 }; 106 107 for (n = 0; n < 256; n += sizeof(dump)) { 108 for (n1 = 0; n1 < sizeof(dump); n1++) 109 if (n == address_no_read[idx]) { 110 idx++; 111 dump[n1] = 0x00; 112 } else 113 dump[n1] = pcf50633_reg_read(pcf, n + n1); 114 115 hex_dump_to_buffer(dump, sizeof(dump), 16, 1, buf1, 128, 0); 116 buf1 += strlen(buf1); 117 *buf1++ = '\n'; 118 *buf1 = '\0'; 119 } 120 121 return buf1 - buf; 122 } 123 static DEVICE_ATTR(dump_regs, 0400, show_dump_regs, NULL); 124 125 static ssize_t show_resume_reason(struct device *dev, 126 struct device_attribute *attr, char *buf) 127 { 128 struct pcf50633 *pcf = dev_get_drvdata(dev); 129 int n; 130 131 n = sprintf(buf, "%02x%02x%02x%02x%02x\n", 132 pcf->resume_reason[0], 133 pcf->resume_reason[1], 134 pcf->resume_reason[2], 135 pcf->resume_reason[3], 136 pcf->resume_reason[4]); 137 138 return n; 139 } 140 static DEVICE_ATTR(resume_reason, 0400, show_resume_reason, NULL); 141 142 static struct attribute *pcf_sysfs_entries[] = { 143 &dev_attr_dump_regs.attr, 144 &dev_attr_resume_reason.attr, 145 NULL, 146 }; 147 148 static struct attribute_group pcf_attr_group = { 149 .name = NULL, /* put in device directory */ 150 .attrs = pcf_sysfs_entries, 151 }; 152 153 static void 154 pcf50633_client_dev_register(struct pcf50633 *pcf, const char *name, 155 struct platform_device **pdev) 156 { 157 int ret; 158 159 *pdev = platform_device_alloc(name, -1); 160 if (!*pdev) { 161 dev_err(pcf->dev, "Falied to allocate %s\n", name); 162 return; 163 } 164 165 (*pdev)->dev.parent = pcf->dev; 166 167 ret = platform_device_add(*pdev); 168 if (ret) { 169 dev_err(pcf->dev, "Failed to register %s: %d\n", name, ret); 170 platform_device_put(*pdev); 171 *pdev = NULL; 172 } 173 } 174 175 #ifdef CONFIG_PM_SLEEP 176 static int pcf50633_suspend(struct device *dev) 177 { 178 struct i2c_client *client = to_i2c_client(dev); 179 struct pcf50633 *pcf = i2c_get_clientdata(client); 180 181 return pcf50633_irq_suspend(pcf); 182 } 183 184 static int pcf50633_resume(struct device *dev) 185 { 186 struct i2c_client *client = to_i2c_client(dev); 187 struct pcf50633 *pcf = i2c_get_clientdata(client); 188 189 return pcf50633_irq_resume(pcf); 190 } 191 #endif 192 193 static SIMPLE_DEV_PM_OPS(pcf50633_pm, pcf50633_suspend, pcf50633_resume); 194 195 static struct regmap_config pcf50633_regmap_config = { 196 .reg_bits = 8, 197 .val_bits = 8, 198 }; 199 200 static int __devinit pcf50633_probe(struct i2c_client *client, 201 const struct i2c_device_id *ids) 202 { 203 struct pcf50633 *pcf; 204 struct pcf50633_platform_data *pdata = client->dev.platform_data; 205 int i, ret; 206 int version, variant; 207 208 if (!client->irq) { 209 dev_err(&client->dev, "Missing IRQ\n"); 210 return -ENOENT; 211 } 212 213 pcf = kzalloc(sizeof(*pcf), GFP_KERNEL); 214 if (!pcf) 215 return -ENOMEM; 216 217 pcf->pdata = pdata; 218 219 mutex_init(&pcf->lock); 220 221 pcf->regmap = regmap_init_i2c(client, &pcf50633_regmap_config); 222 if (IS_ERR(pcf->regmap)) { 223 ret = PTR_ERR(pcf->regmap); 224 dev_err(pcf->dev, "Failed to allocate register map: %d\n", 225 ret); 226 goto err_free; 227 } 228 229 i2c_set_clientdata(client, pcf); 230 pcf->dev = &client->dev; 231 232 version = pcf50633_reg_read(pcf, 0); 233 variant = pcf50633_reg_read(pcf, 1); 234 if (version < 0 || variant < 0) { 235 dev_err(pcf->dev, "Unable to probe pcf50633\n"); 236 ret = -ENODEV; 237 goto err_regmap; 238 } 239 240 dev_info(pcf->dev, "Probed device version %d variant %d\n", 241 version, variant); 242 243 pcf50633_irq_init(pcf, client->irq); 244 245 /* Create sub devices */ 246 pcf50633_client_dev_register(pcf, "pcf50633-input", 247 &pcf->input_pdev); 248 pcf50633_client_dev_register(pcf, "pcf50633-rtc", 249 &pcf->rtc_pdev); 250 pcf50633_client_dev_register(pcf, "pcf50633-mbc", 251 &pcf->mbc_pdev); 252 pcf50633_client_dev_register(pcf, "pcf50633-adc", 253 &pcf->adc_pdev); 254 pcf50633_client_dev_register(pcf, "pcf50633-backlight", 255 &pcf->bl_pdev); 256 257 258 for (i = 0; i < PCF50633_NUM_REGULATORS; i++) { 259 struct platform_device *pdev; 260 261 pdev = platform_device_alloc("pcf50633-regltr", i); 262 if (!pdev) { 263 dev_err(pcf->dev, "Cannot create regulator %d\n", i); 264 continue; 265 } 266 267 pdev->dev.parent = pcf->dev; 268 platform_device_add_data(pdev, &pdata->reg_init_data[i], 269 sizeof(pdata->reg_init_data[i])); 270 pcf->regulator_pdev[i] = pdev; 271 272 platform_device_add(pdev); 273 } 274 275 ret = sysfs_create_group(&client->dev.kobj, &pcf_attr_group); 276 if (ret) 277 dev_err(pcf->dev, "error creating sysfs entries\n"); 278 279 if (pdata->probe_done) 280 pdata->probe_done(pcf); 281 282 return 0; 283 284 err_regmap: 285 regmap_exit(pcf->regmap); 286 err_free: 287 kfree(pcf); 288 289 return ret; 290 } 291 292 static int __devexit pcf50633_remove(struct i2c_client *client) 293 { 294 struct pcf50633 *pcf = i2c_get_clientdata(client); 295 int i; 296 297 sysfs_remove_group(&client->dev.kobj, &pcf_attr_group); 298 pcf50633_irq_free(pcf); 299 300 platform_device_unregister(pcf->input_pdev); 301 platform_device_unregister(pcf->rtc_pdev); 302 platform_device_unregister(pcf->mbc_pdev); 303 platform_device_unregister(pcf->adc_pdev); 304 platform_device_unregister(pcf->bl_pdev); 305 306 for (i = 0; i < PCF50633_NUM_REGULATORS; i++) 307 platform_device_unregister(pcf->regulator_pdev[i]); 308 309 regmap_exit(pcf->regmap); 310 kfree(pcf); 311 312 return 0; 313 } 314 315 static const struct i2c_device_id pcf50633_id_table[] = { 316 {"pcf50633", 0x73}, 317 {/* end of list */} 318 }; 319 MODULE_DEVICE_TABLE(i2c, pcf50633_id_table); 320 321 static struct i2c_driver pcf50633_driver = { 322 .driver = { 323 .name = "pcf50633", 324 .pm = &pcf50633_pm, 325 }, 326 .id_table = pcf50633_id_table, 327 .probe = pcf50633_probe, 328 .remove = __devexit_p(pcf50633_remove), 329 }; 330 331 static int __init pcf50633_init(void) 332 { 333 return i2c_add_driver(&pcf50633_driver); 334 } 335 336 static void __exit pcf50633_exit(void) 337 { 338 i2c_del_driver(&pcf50633_driver); 339 } 340 341 MODULE_DESCRIPTION("I2C chip driver for NXP PCF50633 PMU"); 342 MODULE_AUTHOR("Harald Welte <laforge@openmoko.org>"); 343 MODULE_LICENSE("GPL"); 344 345 subsys_initcall(pcf50633_init); 346 module_exit(pcf50633_exit); 347