/* * drivers/w1/slaves/w1_bq27000.c * * Copyright (C) 2007 Texas Instruments, Inc. * * This file is licensed under the terms of the GNU General Public License * version 2. This program is licensed "as is" without any warranty of any * kind, whether express or implied. * */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/device.h> #include <linux/types.h> #include <linux/platform_device.h> #include <linux/mutex.h> #include "../w1.h" #include "../w1_int.h" #include "../w1_family.h" #define HDQ_CMD_READ (0) #define HDQ_CMD_WRITE (1<<7) static int F_ID; void w1_bq27000_write(struct device *dev, u8 buf, u8 reg) { struct w1_slave *sl = container_of(dev, struct w1_slave, dev); if (!dev) { pr_info("Could not obtain slave dev ptr\n"); return; } w1_write_8(sl->master, HDQ_CMD_WRITE | reg); w1_write_8(sl->master, buf); } EXPORT_SYMBOL(w1_bq27000_write); int w1_bq27000_read(struct device *dev, u8 reg) { u8 val; struct w1_slave *sl = container_of(dev, struct w1_slave, dev); if (!dev) return 0; w1_write_8(sl->master, HDQ_CMD_READ | reg); val = w1_read_8(sl->master); return val; } EXPORT_SYMBOL(w1_bq27000_read); static int w1_bq27000_add_slave(struct w1_slave *sl) { int ret; int id = 1; struct platform_device *pdev; pdev = platform_device_alloc("bq27000-battery", id); if (!pdev) { ret = -ENOMEM; return ret; } pdev->dev.parent = &sl->dev; ret = platform_device_add(pdev); if (ret) goto pdev_add_failed; dev_set_drvdata(&sl->dev, pdev); goto success; pdev_add_failed: platform_device_unregister(pdev); success: return ret; } static void w1_bq27000_remove_slave(struct w1_slave *sl) { struct platform_device *pdev = dev_get_drvdata(&sl->dev); platform_device_unregister(pdev); } static struct w1_family_ops w1_bq27000_fops = { .add_slave = w1_bq27000_add_slave, .remove_slave = w1_bq27000_remove_slave, }; static struct w1_family w1_bq27000_family = { .fid = 1, .fops = &w1_bq27000_fops, }; static int __init w1_bq27000_init(void) { if (F_ID) w1_bq27000_family.fid = F_ID; return w1_register_family(&w1_bq27000_family); } static void __exit w1_bq27000_exit(void) { w1_unregister_family(&w1_bq27000_family); } module_init(w1_bq27000_init); module_exit(w1_bq27000_exit); module_param(F_ID, int, S_IRUSR); MODULE_PARM_DESC(F_ID, "1-wire slave FID for BQ device"); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Texas Instruments Ltd"); MODULE_DESCRIPTION("HDQ/1-wire slave driver bq27000 battery monitor chip");