linux/drivers/mfd/pm8921-core.c
Abhijeet Dharmapurikar c013f0a56c mfd: Add pm8xxx irq support
Add support for the irq controller in Qualcomm 8xxx pmic. The 8xxx
interrupt controller provides control for gpio and mpp configured as
interrupts in addition to other subdevice interrupts. The interrupt
controller also provides a way to read the real time status of an
interrupt. This real time status is the only way one can get the
input values of gpio and mpp lines.

Signed-off-by: Abhijeet Dharmapurikar <adharmap@codeaurora.org>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2011-05-26 19:45:28 +02:00

212 lines
5.4 KiB
C

/*
* 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/platform_device.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/msm_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 msm_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 msm_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 msm_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 msm_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 __devinit 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 __devinit pm8921_probe(struct platform_device *pdev)
{
const struct pm8921_platform_data *pdata = pdev->dev.platform_data;
struct pm8921 *pmic;
int rc;
u8 val;
u32 rev;
if (!pdata) {
pr_err("missing platform data\n");
return -EINVAL;
}
pmic = kzalloc(sizeof(struct pm8921), GFP_KERNEL);
if (!pmic) {
pr_err("Cannot alloc pm8921 struct\n");
return -ENOMEM;
}
/* Read PMIC chip revision */
rc = msm_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);
goto err_read_rev;
}
pr_info("PMIC revision 1: %02X\n", val);
rev = val;
/* Read PMIC chip revision 2 */
rc = msm_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);
goto err_read_rev;
}
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);
platform_set_drvdata(pdev, NULL);
err_read_rev:
kfree(pmic);
return rc;
}
static int __devexit 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;
}
platform_set_drvdata(pdev, NULL);
kfree(pmic);
return 0;
}
static struct platform_driver pm8921_driver = {
.probe = pm8921_probe,
.remove = __devexit_p(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");