1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* NXP PCF50633 Power Management Unit (PMU) driver 3 * 4 * (C) 2006-2008 by Openmoko, Inc. 5 * Author: Harald Welte <laforge@openmoko.org> 6 * Balaji Rao <balajirrao@openmoko.org> 7 * All rights reserved. 8 */ 9 10 #include <linux/kernel.h> 11 #include <linux/device.h> 12 #include <linux/sysfs.h> 13 #include <linux/module.h> 14 #include <linux/types.h> 15 #include <linux/interrupt.h> 16 #include <linux/workqueue.h> 17 #include <linux/platform_device.h> 18 #include <linux/i2c.h> 19 #include <linux/pm.h> 20 #include <linux/slab.h> 21 #include <linux/regmap.h> 22 #include <linux/err.h> 23 24 #include <linux/mfd/pcf50633/core.h> 25 26 /* Read a block of up to 32 regs */ pcf50633_read_block(struct pcf50633 * pcf,u8 reg,int nr_regs,u8 * data)27 int pcf50633_read_block(struct pcf50633 *pcf, u8 reg, 28 int nr_regs, u8 *data) 29 { 30 int ret; 31 32 ret = regmap_raw_read(pcf->regmap, reg, data, nr_regs); 33 if (ret != 0) 34 return ret; 35 36 return nr_regs; 37 } 38 EXPORT_SYMBOL_GPL(pcf50633_read_block); 39 40 /* Write a block of up to 32 regs */ pcf50633_write_block(struct pcf50633 * pcf,u8 reg,int nr_regs,u8 * data)41 int pcf50633_write_block(struct pcf50633 *pcf , u8 reg, 42 int nr_regs, u8 *data) 43 { 44 return regmap_raw_write(pcf->regmap, reg, data, nr_regs); 45 } 46 EXPORT_SYMBOL_GPL(pcf50633_write_block); 47 pcf50633_reg_read(struct pcf50633 * pcf,u8 reg)48 u8 pcf50633_reg_read(struct pcf50633 *pcf, u8 reg) 49 { 50 unsigned int val; 51 int ret; 52 53 ret = regmap_read(pcf->regmap, reg, &val); 54 if (ret < 0) 55 return -1; 56 57 return val; 58 } 59 EXPORT_SYMBOL_GPL(pcf50633_reg_read); 60 pcf50633_reg_write(struct pcf50633 * pcf,u8 reg,u8 val)61 int pcf50633_reg_write(struct pcf50633 *pcf, u8 reg, u8 val) 62 { 63 return regmap_write(pcf->regmap, reg, val); 64 } 65 EXPORT_SYMBOL_GPL(pcf50633_reg_write); 66 pcf50633_reg_set_bit_mask(struct pcf50633 * pcf,u8 reg,u8 mask,u8 val)67 int pcf50633_reg_set_bit_mask(struct pcf50633 *pcf, u8 reg, u8 mask, u8 val) 68 { 69 return regmap_update_bits(pcf->regmap, reg, mask, val); 70 } 71 EXPORT_SYMBOL_GPL(pcf50633_reg_set_bit_mask); 72 pcf50633_reg_clear_bits(struct pcf50633 * pcf,u8 reg,u8 val)73 int pcf50633_reg_clear_bits(struct pcf50633 *pcf, u8 reg, u8 val) 74 { 75 return regmap_update_bits(pcf->regmap, reg, val, 0); 76 } 77 EXPORT_SYMBOL_GPL(pcf50633_reg_clear_bits); 78 79 /* sysfs attributes */ dump_regs_show(struct device * dev,struct device_attribute * attr,char * buf)80 static ssize_t dump_regs_show(struct device *dev, 81 struct device_attribute *attr, char *buf) 82 { 83 struct pcf50633 *pcf = dev_get_drvdata(dev); 84 u8 dump[16]; 85 int n, n1, idx = 0; 86 char *buf1 = buf; 87 static u8 address_no_read[] = { /* must be ascending */ 88 PCF50633_REG_INT1, 89 PCF50633_REG_INT2, 90 PCF50633_REG_INT3, 91 PCF50633_REG_INT4, 92 PCF50633_REG_INT5, 93 0 /* terminator */ 94 }; 95 96 for (n = 0; n < 256; n += sizeof(dump)) { 97 for (n1 = 0; n1 < sizeof(dump); n1++) 98 if (n == address_no_read[idx]) { 99 idx++; 100 dump[n1] = 0x00; 101 } else 102 dump[n1] = pcf50633_reg_read(pcf, n + n1); 103 104 buf1 += sprintf(buf1, "%*ph\n", (int)sizeof(dump), dump); 105 } 106 107 return buf1 - buf; 108 } 109 static DEVICE_ATTR_ADMIN_RO(dump_regs); 110 resume_reason_show(struct device * dev,struct device_attribute * attr,char * buf)111 static ssize_t resume_reason_show(struct device *dev, 112 struct device_attribute *attr, char *buf) 113 { 114 struct pcf50633 *pcf = dev_get_drvdata(dev); 115 int n; 116 117 n = sprintf(buf, "%02x%02x%02x%02x%02x\n", 118 pcf->resume_reason[0], 119 pcf->resume_reason[1], 120 pcf->resume_reason[2], 121 pcf->resume_reason[3], 122 pcf->resume_reason[4]); 123 124 return n; 125 } 126 static DEVICE_ATTR_ADMIN_RO(resume_reason); 127 128 static struct attribute *pcf_sysfs_entries[] = { 129 &dev_attr_dump_regs.attr, 130 &dev_attr_resume_reason.attr, 131 NULL, 132 }; 133 134 static struct attribute_group pcf_attr_group = { 135 .name = NULL, /* put in device directory */ 136 .attrs = pcf_sysfs_entries, 137 }; 138 139 static void pcf50633_client_dev_register(struct pcf50633 * pcf,const char * name,struct platform_device ** pdev)140 pcf50633_client_dev_register(struct pcf50633 *pcf, const char *name, 141 struct platform_device **pdev) 142 { 143 int ret; 144 145 *pdev = platform_device_alloc(name, -1); 146 if (!*pdev) { 147 dev_err(pcf->dev, "Failed to allocate %s\n", name); 148 return; 149 } 150 151 (*pdev)->dev.parent = pcf->dev; 152 153 ret = platform_device_add(*pdev); 154 if (ret) { 155 dev_err(pcf->dev, "Failed to register %s: %d\n", name, ret); 156 platform_device_put(*pdev); 157 *pdev = NULL; 158 } 159 } 160 161 static const struct regmap_config pcf50633_regmap_config = { 162 .reg_bits = 8, 163 .val_bits = 8, 164 }; 165 pcf50633_probe(struct i2c_client * client)166 static int pcf50633_probe(struct i2c_client *client) 167 { 168 struct pcf50633 *pcf; 169 struct platform_device *pdev; 170 struct pcf50633_platform_data *pdata = dev_get_platdata(&client->dev); 171 int i, j, ret; 172 int version, variant; 173 174 if (!client->irq) { 175 dev_err(&client->dev, "Missing IRQ\n"); 176 return -ENOENT; 177 } 178 179 pcf = devm_kzalloc(&client->dev, sizeof(*pcf), GFP_KERNEL); 180 if (!pcf) 181 return -ENOMEM; 182 183 i2c_set_clientdata(client, pcf); 184 pcf->dev = &client->dev; 185 pcf->pdata = pdata; 186 187 mutex_init(&pcf->lock); 188 189 pcf->regmap = devm_regmap_init_i2c(client, &pcf50633_regmap_config); 190 if (IS_ERR(pcf->regmap)) { 191 ret = PTR_ERR(pcf->regmap); 192 dev_err(pcf->dev, "Failed to allocate register map: %d\n", ret); 193 return ret; 194 } 195 196 version = pcf50633_reg_read(pcf, 0); 197 variant = pcf50633_reg_read(pcf, 1); 198 if (version < 0 || variant < 0) { 199 dev_err(pcf->dev, "Unable to probe pcf50633\n"); 200 ret = -ENODEV; 201 return ret; 202 } 203 204 dev_info(pcf->dev, "Probed device version %d variant %d\n", 205 version, variant); 206 207 pcf50633_irq_init(pcf, client->irq); 208 209 /* Create sub devices */ 210 pcf50633_client_dev_register(pcf, "pcf50633-input", &pcf->input_pdev); 211 pcf50633_client_dev_register(pcf, "pcf50633-rtc", &pcf->rtc_pdev); 212 pcf50633_client_dev_register(pcf, "pcf50633-mbc", &pcf->mbc_pdev); 213 pcf50633_client_dev_register(pcf, "pcf50633-adc", &pcf->adc_pdev); 214 pcf50633_client_dev_register(pcf, "pcf50633-backlight", &pcf->bl_pdev); 215 216 217 for (i = 0; i < PCF50633_NUM_REGULATORS; i++) { 218 pdev = platform_device_alloc("pcf50633-regulator", i); 219 if (!pdev) { 220 ret = -ENOMEM; 221 goto err2; 222 } 223 224 pdev->dev.parent = pcf->dev; 225 ret = platform_device_add_data(pdev, &pdata->reg_init_data[i], 226 sizeof(pdata->reg_init_data[i])); 227 if (ret) 228 goto err; 229 230 ret = platform_device_add(pdev); 231 if (ret) 232 goto err; 233 234 pcf->regulator_pdev[i] = pdev; 235 } 236 237 ret = sysfs_create_group(&client->dev.kobj, &pcf_attr_group); 238 if (ret) 239 dev_warn(pcf->dev, "error creating sysfs entries\n"); 240 241 if (pdata->probe_done) 242 pdata->probe_done(pcf); 243 244 return 0; 245 246 err: 247 platform_device_put(pdev); 248 err2: 249 for (j = 0; j < i; j++) 250 platform_device_put(pcf->regulator_pdev[j]); 251 252 return ret; 253 } 254 pcf50633_remove(struct i2c_client * client)255 static void pcf50633_remove(struct i2c_client *client) 256 { 257 struct pcf50633 *pcf = i2c_get_clientdata(client); 258 int i; 259 260 sysfs_remove_group(&client->dev.kobj, &pcf_attr_group); 261 pcf50633_irq_free(pcf); 262 263 platform_device_unregister(pcf->input_pdev); 264 platform_device_unregister(pcf->rtc_pdev); 265 platform_device_unregister(pcf->mbc_pdev); 266 platform_device_unregister(pcf->adc_pdev); 267 platform_device_unregister(pcf->bl_pdev); 268 269 for (i = 0; i < PCF50633_NUM_REGULATORS; i++) 270 platform_device_unregister(pcf->regulator_pdev[i]); 271 } 272 273 static const struct i2c_device_id pcf50633_id_table[] = { 274 {"pcf50633", 0x73}, 275 {/* end of list */} 276 }; 277 MODULE_DEVICE_TABLE(i2c, pcf50633_id_table); 278 279 static struct i2c_driver pcf50633_driver = { 280 .driver = { 281 .name = "pcf50633", 282 .pm = pm_sleep_ptr(&pcf50633_pm), 283 }, 284 .id_table = pcf50633_id_table, 285 .probe = pcf50633_probe, 286 .remove = pcf50633_remove, 287 }; 288 pcf50633_init(void)289 static int __init pcf50633_init(void) 290 { 291 return i2c_add_driver(&pcf50633_driver); 292 } 293 pcf50633_exit(void)294 static void __exit pcf50633_exit(void) 295 { 296 i2c_del_driver(&pcf50633_driver); 297 } 298 299 MODULE_DESCRIPTION("I2C chip driver for NXP PCF50633 PMU"); 300 MODULE_AUTHOR("Harald Welte <laforge@openmoko.org>"); 301 MODULE_LICENSE("GPL"); 302 303 subsys_initcall(pcf50633_init); 304 module_exit(pcf50633_exit); 305