cfbc619033
Provide the BQ27000 slave interface driver. Signed-off-by: Madhusudhan Chikkature<madhu.cr@ti.com> Acked-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
124 lines
2.4 KiB
C
124 lines
2.4 KiB
C
/*
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* drivers/w1/slaves/w1_bq27000.c
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*
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* Copyright (C) 2007 Texas Instruments, Inc.
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*
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* This file is licensed under the terms of the GNU General Public License
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* version 2. This program is licensed "as is" without any warranty of any
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* kind, whether express or implied.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/types.h>
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#include <linux/platform_device.h>
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#include <linux/mutex.h>
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#include "../w1.h"
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#include "../w1_int.h"
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#include "../w1_family.h"
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#define HDQ_CMD_READ (0)
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#define HDQ_CMD_WRITE (1<<7)
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static int F_ID;
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void w1_bq27000_write(struct device *dev, u8 buf, u8 reg)
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{
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struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
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if (!dev) {
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pr_info("Could not obtain slave dev ptr\n");
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return;
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}
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w1_write_8(sl->master, HDQ_CMD_WRITE | reg);
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w1_write_8(sl->master, buf);
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}
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EXPORT_SYMBOL(w1_bq27000_write);
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int w1_bq27000_read(struct device *dev, u8 reg)
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{
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u8 val;
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struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
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if (!dev)
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return 0;
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w1_write_8(sl->master, HDQ_CMD_READ | reg);
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val = w1_read_8(sl->master);
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return val;
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}
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EXPORT_SYMBOL(w1_bq27000_read);
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static int w1_bq27000_add_slave(struct w1_slave *sl)
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{
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int ret;
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int id = 1;
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struct platform_device *pdev;
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pdev = platform_device_alloc("bq27000-battery", id);
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if (!pdev) {
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ret = -ENOMEM;
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return ret;
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}
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pdev->dev.parent = &sl->dev;
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ret = platform_device_add(pdev);
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if (ret)
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goto pdev_add_failed;
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dev_set_drvdata(&sl->dev, pdev);
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goto success;
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pdev_add_failed:
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platform_device_unregister(pdev);
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success:
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return ret;
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}
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static void w1_bq27000_remove_slave(struct w1_slave *sl)
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{
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struct platform_device *pdev = dev_get_drvdata(&sl->dev);
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platform_device_unregister(pdev);
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}
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static struct w1_family_ops w1_bq27000_fops = {
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.add_slave = w1_bq27000_add_slave,
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.remove_slave = w1_bq27000_remove_slave,
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};
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static struct w1_family w1_bq27000_family = {
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.fid = 1,
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.fops = &w1_bq27000_fops,
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};
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static int __init w1_bq27000_init(void)
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{
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if (F_ID)
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w1_bq27000_family.fid = F_ID;
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return w1_register_family(&w1_bq27000_family);
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}
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static void __exit w1_bq27000_exit(void)
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{
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w1_unregister_family(&w1_bq27000_family);
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}
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module_init(w1_bq27000_init);
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module_exit(w1_bq27000_exit);
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module_param(F_ID, int, S_IRUSR);
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MODULE_PARM_DESC(F_ID, "1-wire slave FID for BQ device");
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Texas Instruments Ltd");
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MODULE_DESCRIPTION("HDQ/1-wire slave driver bq27000 battery monitor chip");
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