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1/*2 * tps6507x.c -- TPS6507x chip family multi-function driver3 *4 * Copyright (c) 2010 RidgeRun (todd.fischer@ridgerun.com)5 *6 * Author: Todd Fischer7 * todd.fischer@ridgerun.com8 *9 * Credits:10 *11 * Using code from wm831x-*.c, wm8400-core, Wolfson Microelectronics PLC.12 *13 * For licencing details see kernel-base/COPYING14 *15 */16 17#include <linux/module.h>18#include <linux/moduleparam.h>19#include <linux/init.h>20#include <linux/slab.h>21#include <linux/i2c.h>22#include <linux/of.h>23#include <linux/mfd/core.h>24#include <linux/mfd/tps6507x.h>25 26static const struct mfd_cell tps6507x_devs[] = {27 {28 .name = "tps6507x-pmic",29 },30 {31 .name = "tps6507x-ts",32 },33};34 35 36static int tps6507x_i2c_read_device(struct tps6507x_dev *tps6507x, char reg,37 int bytes, void *dest)38{39 struct i2c_client *i2c = tps6507x->i2c_client;40 struct i2c_msg xfer[2];41 int ret;42 43 /* Write register */44 xfer[0].addr = i2c->addr;45 xfer[0].flags = 0;46 xfer[0].len = 1;47 xfer[0].buf = ®48 49 /* Read data */50 xfer[1].addr = i2c->addr;51 xfer[1].flags = I2C_M_RD;52 xfer[1].len = bytes;53 xfer[1].buf = dest;54 55 ret = i2c_transfer(i2c->adapter, xfer, 2);56 if (ret == 2)57 ret = 0;58 else if (ret >= 0)59 ret = -EIO;60 61 return ret;62}63 64static int tps6507x_i2c_write_device(struct tps6507x_dev *tps6507x, char reg,65 int bytes, void *src)66{67 struct i2c_client *i2c = tps6507x->i2c_client;68 /* we add 1 byte for device register */69 u8 msg[TPS6507X_MAX_REGISTER + 1];70 int ret;71 72 if (bytes > TPS6507X_MAX_REGISTER)73 return -EINVAL;74 75 msg[0] = reg;76 memcpy(&msg[1], src, bytes);77 78 ret = i2c_master_send(i2c, msg, bytes + 1);79 if (ret < 0)80 return ret;81 if (ret != bytes + 1)82 return -EIO;83 return 0;84}85 86static int tps6507x_i2c_probe(struct i2c_client *i2c)87{88 struct tps6507x_dev *tps6507x;89 90 tps6507x = devm_kzalloc(&i2c->dev, sizeof(struct tps6507x_dev),91 GFP_KERNEL);92 if (tps6507x == NULL)93 return -ENOMEM;94 95 i2c_set_clientdata(i2c, tps6507x);96 tps6507x->dev = &i2c->dev;97 tps6507x->i2c_client = i2c;98 tps6507x->read_dev = tps6507x_i2c_read_device;99 tps6507x->write_dev = tps6507x_i2c_write_device;100 101 return devm_mfd_add_devices(tps6507x->dev, -1, tps6507x_devs,102 ARRAY_SIZE(tps6507x_devs), NULL, 0, NULL);103}104 105static const struct i2c_device_id tps6507x_i2c_id[] = {106 { "tps6507x" },107 { }108};109MODULE_DEVICE_TABLE(i2c, tps6507x_i2c_id);110 111#ifdef CONFIG_OF112static const struct of_device_id tps6507x_of_match[] = {113 {.compatible = "ti,tps6507x", },114 {},115};116MODULE_DEVICE_TABLE(of, tps6507x_of_match);117#endif118 119static struct i2c_driver tps6507x_i2c_driver = {120 .driver = {121 .name = "tps6507x",122 .of_match_table = of_match_ptr(tps6507x_of_match),123 },124 .probe = tps6507x_i2c_probe,125 .id_table = tps6507x_i2c_id,126};127 128static int __init tps6507x_i2c_init(void)129{130 return i2c_add_driver(&tps6507x_i2c_driver);131}132/* init early so consumer devices can complete system boot */133subsys_initcall(tps6507x_i2c_init);134 135static void __exit tps6507x_i2c_exit(void)136{137 i2c_del_driver(&tps6507x_i2c_driver);138}139module_exit(tps6507x_i2c_exit);140 141MODULE_DESCRIPTION("TPS6507x chip family multi-function driver");142MODULE_LICENSE("GPL");143