/* * tps6507x.c -- TPS6507x chip family multi-function driver * * Copyright (c) 2010 RidgeRun (todd.fischer@ridgerun.com) * * Author: Todd Fischer * todd.fischer@ridgerun.com * * Credits: * * Using code from wm831x-*.c, wm8400-core, Wolfson Microelectronics PLC. * * For licencing details see kernel-base/COPYING * */ #include <linux/module.h> #include <linux/moduleparam.h> #include <linux/init.h> #include <linux/slab.h> #include <linux/i2c.h> #include <linux/of.h> #include <linux/mfd/core.h> #include <linux/mfd/tps6507x.h> static const struct mfd_cell tps6507x_devs[] = { { .name = "tps6507x-pmic", }, { .name = "tps6507x-ts", }, }; static int tps6507x_i2c_read_device(struct tps6507x_dev *tps6507x, char reg, int bytes, void *dest) { struct i2c_client *i2c = tps6507x->i2c_client; struct i2c_msg xfer[2]; int ret; /* Write register */ xfer[0].addr = i2c->addr; xfer[0].flags = 0; xfer[0].len = 1; xfer[0].buf = ® /* Read data */ xfer[1].addr = i2c->addr; xfer[1].flags = I2C_M_RD; xfer[1].len = bytes; xfer[1].buf = dest; ret = i2c_transfer(i2c->adapter, xfer, 2); if (ret == 2) ret = 0; else if (ret >= 0) ret = -EIO; return ret; } static int tps6507x_i2c_write_device(struct tps6507x_dev *tps6507x, char reg, int bytes, void *src) { struct i2c_client *i2c = tps6507x->i2c_client; /* we add 1 byte for device register */ u8 msg[TPS6507X_MAX_REGISTER + 1]; int ret; if (bytes > TPS6507X_MAX_REGISTER) return -EINVAL; msg[0] = reg; memcpy(&msg[1], src, bytes); ret = i2c_master_send(i2c, msg, bytes + 1); if (ret < 0) return ret; if (ret != bytes + 1) return -EIO; return 0; } static int tps6507x_i2c_probe(struct i2c_client *i2c) { struct tps6507x_dev *tps6507x; tps6507x = devm_kzalloc(&i2c->dev, sizeof(struct tps6507x_dev), GFP_KERNEL); if (tps6507x == NULL) return -ENOMEM; i2c_set_clientdata(i2c, tps6507x); tps6507x->dev = &i2c->dev; tps6507x->i2c_client = i2c; tps6507x->read_dev = tps6507x_i2c_read_device; tps6507x->write_dev = tps6507x_i2c_write_device; return devm_mfd_add_devices(tps6507x->dev, -1, tps6507x_devs, ARRAY_SIZE(tps6507x_devs), NULL, 0, NULL); } static const struct i2c_device_id tps6507x_i2c_id[] = { { "tps6507x", 0 }, { } }; MODULE_DEVICE_TABLE(i2c, tps6507x_i2c_id); #ifdef CONFIG_OF static const struct of_device_id tps6507x_of_match[] = { {.compatible = "ti,tps6507x", }, {}, }; MODULE_DEVICE_TABLE(of, tps6507x_of_match); #endif static struct i2c_driver tps6507x_i2c_driver = { .driver = { .name = "tps6507x", .of_match_table = of_match_ptr(tps6507x_of_match), }, .probe = tps6507x_i2c_probe, .id_table = tps6507x_i2c_id, }; static int __init tps6507x_i2c_init(void) { return i2c_add_driver(&tps6507x_i2c_driver); } /* init early so consumer devices can complete system boot */ subsys_initcall(tps6507x_i2c_init); static void __exit tps6507x_i2c_exit(void) { i2c_del_driver(&tps6507x_i2c_driver); } module_exit(tps6507x_i2c_exit); MODULE_DESCRIPTION("TPS6507x chip family multi-function driver"); MODULE_LICENSE("GPL");