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 buf1 += sprintf(buf1, "%*ph\n", (int)sizeof(dump), dump); 110 } 111 112 return buf1 - buf; 113 } 114 static DEVICE_ATTR(dump_regs, 0400, show_dump_regs, NULL); 115 116 static ssize_t show_resume_reason(struct device *dev, 117 struct device_attribute *attr, char *buf) 118 { 119 struct pcf50633 *pcf = dev_get_drvdata(dev); 120 int n; 121 122 n = sprintf(buf, "%02x%02x%02x%02x%02x\n", 123 pcf->resume_reason[0], 124 pcf->resume_reason[1], 125 pcf->resume_reason[2], 126 pcf->resume_reason[3], 127 pcf->resume_reason[4]); 128 129 return n; 130 } 131 static DEVICE_ATTR(resume_reason, 0400, show_resume_reason, NULL); 132 133 static struct attribute *pcf_sysfs_entries[] = { 134 &dev_attr_dump_regs.attr, 135 &dev_attr_resume_reason.attr, 136 NULL, 137 }; 138 139 static struct attribute_group pcf_attr_group = { 140 .name = NULL, /* put in device directory */ 141 .attrs = pcf_sysfs_entries, 142 }; 143 144 static void 145 pcf50633_client_dev_register(struct pcf50633 *pcf, const char *name, 146 struct platform_device **pdev) 147 { 148 int ret; 149 150 *pdev = platform_device_alloc(name, -1); 151 if (!*pdev) { 152 dev_err(pcf->dev, "Failed to allocate %s\n", name); 153 return; 154 } 155 156 (*pdev)->dev.parent = pcf->dev; 157 158 ret = platform_device_add(*pdev); 159 if (ret) { 160 dev_err(pcf->dev, "Failed to register %s: %d\n", name, ret); 161 platform_device_put(*pdev); 162 *pdev = NULL; 163 } 164 } 165 166 #ifdef CONFIG_PM_SLEEP 167 static int pcf50633_suspend(struct device *dev) 168 { 169 struct i2c_client *client = to_i2c_client(dev); 170 struct pcf50633 *pcf = i2c_get_clientdata(client); 171 172 return pcf50633_irq_suspend(pcf); 173 } 174 175 static int pcf50633_resume(struct device *dev) 176 { 177 struct i2c_client *client = to_i2c_client(dev); 178 struct pcf50633 *pcf = i2c_get_clientdata(client); 179 180 return pcf50633_irq_resume(pcf); 181 } 182 #endif 183 184 static SIMPLE_DEV_PM_OPS(pcf50633_pm, pcf50633_suspend, pcf50633_resume); 185 186 static const struct regmap_config pcf50633_regmap_config = { 187 .reg_bits = 8, 188 .val_bits = 8, 189 }; 190 191 static int pcf50633_probe(struct i2c_client *client, 192 const struct i2c_device_id *ids) 193 { 194 struct pcf50633 *pcf; 195 struct platform_device *pdev; 196 struct pcf50633_platform_data *pdata = dev_get_platdata(&client->dev); 197 int i, j, ret; 198 int version, variant; 199 200 if (!client->irq) { 201 dev_err(&client->dev, "Missing IRQ\n"); 202 return -ENOENT; 203 } 204 205 pcf = devm_kzalloc(&client->dev, sizeof(*pcf), GFP_KERNEL); 206 if (!pcf) 207 return -ENOMEM; 208 209 i2c_set_clientdata(client, pcf); 210 pcf->dev = &client->dev; 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 version = pcf50633_reg_read(pcf, 0); 223 variant = pcf50633_reg_read(pcf, 1); 224 if (version < 0 || variant < 0) { 225 dev_err(pcf->dev, "Unable to probe pcf50633\n"); 226 ret = -ENODEV; 227 return ret; 228 } 229 230 dev_info(pcf->dev, "Probed device version %d variant %d\n", 231 version, variant); 232 233 pcf50633_irq_init(pcf, client->irq); 234 235 /* Create sub devices */ 236 pcf50633_client_dev_register(pcf, "pcf50633-input", &pcf->input_pdev); 237 pcf50633_client_dev_register(pcf, "pcf50633-rtc", &pcf->rtc_pdev); 238 pcf50633_client_dev_register(pcf, "pcf50633-mbc", &pcf->mbc_pdev); 239 pcf50633_client_dev_register(pcf, "pcf50633-adc", &pcf->adc_pdev); 240 pcf50633_client_dev_register(pcf, "pcf50633-backlight", &pcf->bl_pdev); 241 242 243 for (i = 0; i < PCF50633_NUM_REGULATORS; i++) { 244 pdev = platform_device_alloc("pcf50633-regulator", i); 245 if (!pdev) { 246 ret = -ENOMEM; 247 goto err2; 248 } 249 250 pdev->dev.parent = pcf->dev; 251 ret = platform_device_add_data(pdev, &pdata->reg_init_data[i], 252 sizeof(pdata->reg_init_data[i])); 253 if (ret) 254 goto err; 255 256 ret = platform_device_add(pdev); 257 if (ret) 258 goto err; 259 260 pcf->regulator_pdev[i] = pdev; 261 } 262 263 ret = sysfs_create_group(&client->dev.kobj, &pcf_attr_group); 264 if (ret) 265 dev_warn(pcf->dev, "error creating sysfs entries\n"); 266 267 if (pdata->probe_done) 268 pdata->probe_done(pcf); 269 270 return 0; 271 272 err: 273 platform_device_put(pdev); 274 err2: 275 for (j = 0; j < i; j++) 276 platform_device_put(pcf->regulator_pdev[j]); 277 278 return ret; 279 } 280 281 static int pcf50633_remove(struct i2c_client *client) 282 { 283 struct pcf50633 *pcf = i2c_get_clientdata(client); 284 int i; 285 286 sysfs_remove_group(&client->dev.kobj, &pcf_attr_group); 287 pcf50633_irq_free(pcf); 288 289 platform_device_unregister(pcf->input_pdev); 290 platform_device_unregister(pcf->rtc_pdev); 291 platform_device_unregister(pcf->mbc_pdev); 292 platform_device_unregister(pcf->adc_pdev); 293 platform_device_unregister(pcf->bl_pdev); 294 295 for (i = 0; i < PCF50633_NUM_REGULATORS; i++) 296 platform_device_unregister(pcf->regulator_pdev[i]); 297 298 return 0; 299 } 300 301 static const struct i2c_device_id pcf50633_id_table[] = { 302 {"pcf50633", 0x73}, 303 {/* end of list */} 304 }; 305 MODULE_DEVICE_TABLE(i2c, pcf50633_id_table); 306 307 static struct i2c_driver pcf50633_driver = { 308 .driver = { 309 .name = "pcf50633", 310 .pm = &pcf50633_pm, 311 }, 312 .id_table = pcf50633_id_table, 313 .probe = pcf50633_probe, 314 .remove = pcf50633_remove, 315 }; 316 317 static int __init pcf50633_init(void) 318 { 319 return i2c_add_driver(&pcf50633_driver); 320 } 321 322 static void __exit pcf50633_exit(void) 323 { 324 i2c_del_driver(&pcf50633_driver); 325 } 326 327 MODULE_DESCRIPTION("I2C chip driver for NXP PCF50633 PMU"); 328 MODULE_AUTHOR("Harald Welte <laforge@openmoko.org>"); 329 MODULE_LICENSE("GPL"); 330 331 subsys_initcall(pcf50633_init); 332 module_exit(pcf50633_exit); 333