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/*
* Copyright (c) 2011, Code Aurora Forum. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#define pr_fmt(fmt) "%s: " fmt, __func__
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/ssbi.h>
#include <linux/mfd/core.h>
#include <linux/mfd/pm8xxx/pm8921.h>
#include <linux/mfd/pm8xxx/core.h>
#define REG_HWREV 0x002 /* PMIC4 revision */
#define REG_HWREV_2 0x0E8 /* PMIC4 revision 2 */
struct pm8921 {
struct device *dev;
struct pm_irq_chip *irq_chip;
};
static int pm8921_readb(const struct device *dev, u16 addr, u8 *val)
{
const struct pm8xxx_drvdata *pm8921_drvdata = dev_get_drvdata(dev);
const struct pm8921 *pmic = pm8921_drvdata->pm_chip_data;
return ssbi_read(pmic->dev->parent, addr, val, 1);
}
static int pm8921_writeb(const struct device *dev, u16 addr, u8 val)
{
const struct pm8xxx_drvdata *pm8921_drvdata = dev_get_drvdata(dev);
const struct pm8921 *pmic = pm8921_drvdata->pm_chip_data;
return ssbi_write(pmic->dev->parent, addr, &val, 1);
}
static int pm8921_read_buf(const struct device *dev, u16 addr, u8 *buf,
int cnt)
{
const struct pm8xxx_drvdata *pm8921_drvdata = dev_get_drvdata(dev);
const struct pm8921 *pmic = pm8921_drvdata->pm_chip_data;
return ssbi_read(pmic->dev->parent, addr, buf, cnt);
}
static int pm8921_write_buf(const struct device *dev, u16 addr, u8 *buf,
int cnt)
{
const struct pm8xxx_drvdata *pm8921_drvdata = dev_get_drvdata(dev);
const struct pm8921 *pmic = pm8921_drvdata->pm_chip_data;
return ssbi_write(pmic->dev->parent, addr, buf, cnt);
}
static int pm8921_read_irq_stat(const struct device *dev, int irq)
{
const struct pm8xxx_drvdata *pm8921_drvdata = dev_get_drvdata(dev);
const struct pm8921 *pmic = pm8921_drvdata->pm_chip_data;
return pm8xxx_get_irq_stat(pmic->irq_chip, irq);
}
static struct pm8xxx_drvdata pm8921_drvdata = {
.pmic_readb = pm8921_readb,
.pmic_writeb = pm8921_writeb,
.pmic_read_buf = pm8921_read_buf,
.pmic_write_buf = pm8921_write_buf,
.pmic_read_irq_stat = pm8921_read_irq_stat,
};
static int pm8921_add_subdevices(const struct pm8921_platform_data
*pdata,
struct pm8921 *pmic,
u32 rev)
{
int ret = 0, irq_base = 0;
struct pm_irq_chip *irq_chip;
if (pdata->irq_pdata) {
pdata->irq_pdata->irq_cdata.nirqs = PM8921_NR_IRQS;
pdata->irq_pdata->irq_cdata.rev = rev;
irq_base = pdata->irq_pdata->irq_base;
irq_chip = pm8xxx_irq_init(pmic->dev, pdata->irq_pdata);
if (IS_ERR(irq_chip)) {
pr_err("Failed to init interrupts ret=%ld\n",
PTR_ERR(irq_chip));
return PTR_ERR(irq_chip);
}
pmic->irq_chip = irq_chip;
}
return ret;
}
static int pm8921_probe(struct platform_device *pdev)
{
const struct pm8921_platform_data *pdata = dev_get_platdata(&pdev->dev);
struct pm8921 *pmic;
int rc;
u8 val;
u32 rev;
if (!pdata) {
pr_err("missing platform data\n");
return -EINVAL;
}
pmic = devm_kzalloc(&pdev->dev, sizeof(struct pm8921), GFP_KERNEL);
if (!pmic) {
pr_err("Cannot alloc pm8921 struct\n");
return -ENOMEM;
}
/* Read PMIC chip revision */
rc = ssbi_read(pdev->dev.parent, REG_HWREV, &val, sizeof(val));
if (rc) {
pr_err("Failed to read hw rev reg %d:rc=%d\n", REG_HWREV, rc);
return rc;
}
pr_info("PMIC revision 1: %02X\n", val);
rev = val;
/* Read PMIC chip revision 2 */
rc = ssbi_read(pdev->dev.parent, REG_HWREV_2, &val, sizeof(val));
if (rc) {
pr_err("Failed to read hw rev 2 reg %d:rc=%d\n",
REG_HWREV_2, rc);
return rc;
}
pr_info("PMIC revision 2: %02X\n", val);
rev |= val << BITS_PER_BYTE;
pmic->dev = &pdev->dev;
pm8921_drvdata.pm_chip_data = pmic;
platform_set_drvdata(pdev, &pm8921_drvdata);
rc = pm8921_add_subdevices(pdata, pmic, rev);
if (rc) {
pr_err("Cannot add subdevices rc=%d\n", rc);
goto err;
}
/* gpio might not work if no irq device is found */
WARN_ON(pmic->irq_chip == NULL);
return 0;
err:
mfd_remove_devices(pmic->dev);
return rc;
}
static int pm8921_remove(struct platform_device *pdev)
{
struct pm8xxx_drvdata *drvdata;
struct pm8921 *pmic = NULL;
drvdata = platform_get_drvdata(pdev);
if (drvdata)
pmic = drvdata->pm_chip_data;
if (pmic) {
mfd_remove_devices(pmic->dev);
if (pmic->irq_chip) {
pm8xxx_irq_exit(pmic->irq_chip);
pmic->irq_chip = NULL;
}
}
return 0;
}
static struct platform_driver pm8921_driver = {
.probe = pm8921_probe,
.remove = pm8921_remove,
.driver = {
.name = "pm8921-core",
.owner = THIS_MODULE,
},
};
static int __init pm8921_init(void)
{
return platform_driver_register(&pm8921_driver);
}
subsys_initcall(pm8921_init);
static void __exit pm8921_exit(void)
{
platform_driver_unregister(&pm8921_driver);
}
module_exit(pm8921_exit);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("PMIC 8921 core driver");
MODULE_VERSION("1.0");
MODULE_ALIAS("platform:pm8921-core");
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