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 return regmap_raw_write(pcf->regmap, reg, data, nr_regs); 50 } 51 EXPORT_SYMBOL_GPL(pcf50633_write_block); 52 53 u8 pcf50633_reg_read(struct pcf50633 *pcf, u8 reg) 54 { 55 unsigned int val; 56 int ret; 57 58 ret = regmap_read(pcf->regmap, reg, &val); 59 if (ret < 0) 60 return -1; 61 62 return val; 63 } 64 EXPORT_SYMBOL_GPL(pcf50633_reg_read); 65 66 int pcf50633_reg_write(struct pcf50633 *pcf, u8 reg, u8 val) 67 { 68 return regmap_write(pcf->regmap, reg, val); 69 } 70 EXPORT_SYMBOL_GPL(pcf50633_reg_write); 71 72 int pcf50633_reg_set_bit_mask(struct pcf50633 *pcf, u8 reg, u8 mask, u8 val) 73 { 74 return regmap_update_bits(pcf->regmap, reg, mask, val); 75 } 76 EXPORT_SYMBOL_GPL(pcf50633_reg_set_bit_mask); 77 78 int pcf50633_reg_clear_bits(struct pcf50633 *pcf, u8 reg, u8 val) 79 { 80 return regmap_update_bits(pcf->regmap, reg, val, 0); 81 } 82 EXPORT_SYMBOL_GPL(pcf50633_reg_clear_bits); 83 84 /* sysfs attributes */ 85 static ssize_t show_dump_regs(struct device *dev, struct device_attribute *attr, 86 char *buf) 87 { 88 struct pcf50633 *pcf = dev_get_drvdata(dev); 89 u8 dump[16]; 90 int n, n1, idx = 0; 91 char *buf1 = buf; 92 static u8 address_no_read[] = { /* must be ascending */ 93 PCF50633_REG_INT1, 94 PCF50633_REG_INT2, 95 PCF50633_REG_INT3, 96 PCF50633_REG_INT4, 97 PCF50633_REG_INT5, 98 0 /* terminator */ 99 }; 100 101 for (n = 0; n < 256; n += sizeof(dump)) { 102 for (n1 = 0; n1 < sizeof(dump); n1++) 103 if (n == address_no_read[idx]) { 104 idx++; 105 dump[n1] = 0x00; 106 } else 107 dump[n1] = pcf50633_reg_read(pcf, n + n1); 108 109 hex_dump_to_buffer(dump, sizeof(dump), 16, 1, buf1, 128, 0); 110 buf1 += strlen(buf1); 111 *buf1++ = '\n'; 112 *buf1 = '\0'; 113 } 114 115 return buf1 - buf; 116 } 117 static DEVICE_ATTR(dump_regs, 0400, show_dump_regs, NULL); 118 119 static ssize_t show_resume_reason(struct device *dev, 120 struct device_attribute *attr, char *buf) 121 { 122 struct pcf50633 *pcf = dev_get_drvdata(dev); 123 int n; 124 125 n = sprintf(buf, "%02x%02x%02x%02x%02x\n", 126 pcf->resume_reason[0], 127 pcf->resume_reason[1], 128 pcf->resume_reason[2], 129 pcf->resume_reason[3], 130 pcf->resume_reason[4]); 131 132 return n; 133 } 134 static DEVICE_ATTR(resume_reason, 0400, show_resume_reason, NULL); 135 136 static struct attribute *pcf_sysfs_entries[] = { 137 &dev_attr_dump_regs.attr, 138 &dev_attr_resume_reason.attr, 139 NULL, 140 }; 141 142 static struct attribute_group pcf_attr_group = { 143 .name = NULL, /* put in device directory */ 144 .attrs = pcf_sysfs_entries, 145 }; 146 147 static void 148 pcf50633_client_dev_register(struct pcf50633 *pcf, const char *name, 149 struct platform_device **pdev) 150 { 151 int ret; 152 153 *pdev = platform_device_alloc(name, -1); 154 if (!*pdev) { 155 dev_err(pcf->dev, "Falied to allocate %s\n", name); 156 return; 157 } 158 159 (*pdev)->dev.parent = pcf->dev; 160 161 ret = platform_device_add(*pdev); 162 if (ret) { 163 dev_err(pcf->dev, "Failed to register %s: %d\n", name, ret); 164 platform_device_put(*pdev); 165 *pdev = NULL; 166 } 167 } 168 169 #ifdef CONFIG_PM_SLEEP 170 static int pcf50633_suspend(struct device *dev) 171 { 172 struct i2c_client *client = to_i2c_client(dev); 173 struct pcf50633 *pcf = i2c_get_clientdata(client); 174 175 return pcf50633_irq_suspend(pcf); 176 } 177 178 static int pcf50633_resume(struct device *dev) 179 { 180 struct i2c_client *client = to_i2c_client(dev); 181 struct pcf50633 *pcf = i2c_get_clientdata(client); 182 183 return pcf50633_irq_resume(pcf); 184 } 185 #endif 186 187 static SIMPLE_DEV_PM_OPS(pcf50633_pm, pcf50633_suspend, pcf50633_resume); 188 189 static struct regmap_config pcf50633_regmap_config = { 190 .reg_bits = 8, 191 .val_bits = 8, 192 }; 193 194 static int __devinit pcf50633_probe(struct i2c_client *client, 195 const struct i2c_device_id *ids) 196 { 197 struct pcf50633 *pcf; 198 struct pcf50633_platform_data *pdata = client->dev.platform_data; 199 int i, ret; 200 int version, variant; 201 202 if (!client->irq) { 203 dev_err(&client->dev, "Missing IRQ\n"); 204 return -ENOENT; 205 } 206 207 pcf = devm_kzalloc(&client->dev, sizeof(*pcf), GFP_KERNEL); 208 if (!pcf) 209 return -ENOMEM; 210 211 pcf->pdata = pdata; 212 213 mutex_init(&pcf->lock); 214 215 pcf->regmap = devm_regmap_init_i2c(client, &pcf50633_regmap_config); 216 if (IS_ERR(pcf->regmap)) { 217 ret = PTR_ERR(pcf->regmap); 218 dev_err(pcf->dev, "Failed to allocate register map: %d\n", ret); 219 return ret; 220 } 221 222 i2c_set_clientdata(client, pcf); 223 pcf->dev = &client->dev; 224 225 version = pcf50633_reg_read(pcf, 0); 226 variant = pcf50633_reg_read(pcf, 1); 227 if (version < 0 || variant < 0) { 228 dev_err(pcf->dev, "Unable to probe pcf50633\n"); 229 ret = -ENODEV; 230 return ret; 231 } 232 233 dev_info(pcf->dev, "Probed device version %d variant %d\n", 234 version, variant); 235 236 pcf50633_irq_init(pcf, client->irq); 237 238 /* Create sub devices */ 239 pcf50633_client_dev_register(pcf, "pcf50633-input", &pcf->input_pdev); 240 pcf50633_client_dev_register(pcf, "pcf50633-rtc", &pcf->rtc_pdev); 241 pcf50633_client_dev_register(pcf, "pcf50633-mbc", &pcf->mbc_pdev); 242 pcf50633_client_dev_register(pcf, "pcf50633-adc", &pcf->adc_pdev); 243 pcf50633_client_dev_register(pcf, "pcf50633-backlight", &pcf->bl_pdev); 244 245 246 for (i = 0; i < PCF50633_NUM_REGULATORS; i++) { 247 struct platform_device *pdev; 248 249 pdev = platform_device_alloc("pcf50633-regltr", i); 250 if (!pdev) { 251 dev_err(pcf->dev, "Cannot create regulator %d\n", i); 252 continue; 253 } 254 255 pdev->dev.parent = pcf->dev; 256 if (platform_device_add_data(pdev, &pdata->reg_init_data[i], 257 sizeof(pdata->reg_init_data[i])) < 0) { 258 platform_device_put(pdev); 259 dev_err(pcf->dev, "Out of memory for regulator parameters %d\n", 260 i); 261 continue; 262 } 263 pcf->regulator_pdev[i] = pdev; 264 265 platform_device_add(pdev); 266 } 267 268 ret = sysfs_create_group(&client->dev.kobj, &pcf_attr_group); 269 if (ret) 270 dev_err(pcf->dev, "error creating sysfs entries\n"); 271 272 if (pdata->probe_done) 273 pdata->probe_done(pcf); 274 275 return 0; 276 } 277 278 static int __devexit pcf50633_remove(struct i2c_client *client) 279 { 280 struct pcf50633 *pcf = i2c_get_clientdata(client); 281 int i; 282 283 sysfs_remove_group(&client->dev.kobj, &pcf_attr_group); 284 pcf50633_irq_free(pcf); 285 286 platform_device_unregister(pcf->input_pdev); 287 platform_device_unregister(pcf->rtc_pdev); 288 platform_device_unregister(pcf->mbc_pdev); 289 platform_device_unregister(pcf->adc_pdev); 290 platform_device_unregister(pcf->bl_pdev); 291 292 for (i = 0; i < PCF50633_NUM_REGULATORS; i++) 293 platform_device_unregister(pcf->regulator_pdev[i]); 294 295 return 0; 296 } 297 298 static const struct i2c_device_id pcf50633_id_table[] = { 299 {"pcf50633", 0x73}, 300 {/* end of list */} 301 }; 302 MODULE_DEVICE_TABLE(i2c, pcf50633_id_table); 303 304 static struct i2c_driver pcf50633_driver = { 305 .driver = { 306 .name = "pcf50633", 307 .pm = &pcf50633_pm, 308 }, 309 .id_table = pcf50633_id_table, 310 .probe = pcf50633_probe, 311 .remove = pcf50633_remove, 312 }; 313 314 static int __init pcf50633_init(void) 315 { 316 return i2c_add_driver(&pcf50633_driver); 317 } 318 319 static void __exit pcf50633_exit(void) 320 { 321 i2c_del_driver(&pcf50633_driver); 322 } 323 324 MODULE_DESCRIPTION("I2C chip driver for NXP PCF50633 PMU"); 325 MODULE_AUTHOR("Harald Welte <laforge@openmoko.org>"); 326 MODULE_LICENSE("GPL"); 327 328 subsys_initcall(pcf50633_init); 329 module_exit(pcf50633_exit); 330