linux/drivers/misc/max8997-muic.c
Donggeun Kim 71e58782d2 misc: Remove max8997-muic sysfs attributes
The 'switch' sysfs attribute is used for
showing and setting the switch state of the device.
However, setting it from the userspace focibly is not appropriate.
And showing the state can be handled from
other places (e.g. external connector) in a unified manner.
This patch removes the sysfs attribute.
Plus, uevent messages for interrupts are also removed.

The initial max8997-muic driver is merged at:
git://git.kernel.org/pub/scm/linux/kernel/git/sameo/mfd-2.6.git for-next

Signed-off-by: Donggeun Kim <dg77.kim@samsung.com>
Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2012-01-09 00:37:42 +01:00

505 lines
13 KiB
C

/*
* max8997-muic.c - MAX8997 muic driver for the Maxim 8997
*
* Copyright (C) 2011 Samsung Electrnoics
* Donggeun Kim <dg77.kim@samsung.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/kobject.h>
#include <linux/mfd/max8997.h>
#include <linux/mfd/max8997-private.h>
/* MAX8997-MUIC STATUS1 register */
#define STATUS1_ADC_SHIFT 0
#define STATUS1_ADCLOW_SHIFT 5
#define STATUS1_ADCERR_SHIFT 6
#define STATUS1_ADC_MASK (0x1f << STATUS1_ADC_SHIFT)
#define STATUS1_ADCLOW_MASK (0x1 << STATUS1_ADCLOW_SHIFT)
#define STATUS1_ADCERR_MASK (0x1 << STATUS1_ADCERR_SHIFT)
/* MAX8997-MUIC STATUS2 register */
#define STATUS2_CHGTYP_SHIFT 0
#define STATUS2_CHGDETRUN_SHIFT 3
#define STATUS2_DCDTMR_SHIFT 4
#define STATUS2_DBCHG_SHIFT 5
#define STATUS2_VBVOLT_SHIFT 6
#define STATUS2_CHGTYP_MASK (0x7 << STATUS2_CHGTYP_SHIFT)
#define STATUS2_CHGDETRUN_MASK (0x1 << STATUS2_CHGDETRUN_SHIFT)
#define STATUS2_DCDTMR_MASK (0x1 << STATUS2_DCDTMR_SHIFT)
#define STATUS2_DBCHG_MASK (0x1 << STATUS2_DBCHG_SHIFT)
#define STATUS2_VBVOLT_MASK (0x1 << STATUS2_VBVOLT_SHIFT)
/* MAX8997-MUIC STATUS3 register */
#define STATUS3_OVP_SHIFT 2
#define STATUS3_OVP_MASK (0x1 << STATUS3_OVP_SHIFT)
/* MAX8997-MUIC CONTROL1 register */
#define COMN1SW_SHIFT 0
#define COMP2SW_SHIFT 3
#define COMN1SW_MASK (0x7 << COMN1SW_SHIFT)
#define COMP2SW_MASK (0x7 << COMP2SW_SHIFT)
#define SW_MASK (COMP2SW_MASK | COMN1SW_MASK)
#define MAX8997_SW_USB ((1 << COMP2SW_SHIFT) | (1 << COMN1SW_SHIFT))
#define MAX8997_SW_AUDIO ((2 << COMP2SW_SHIFT) | (2 << COMN1SW_SHIFT))
#define MAX8997_SW_UART ((3 << COMP2SW_SHIFT) | (3 << COMN1SW_SHIFT))
#define MAX8997_SW_OPEN ((0 << COMP2SW_SHIFT) | (0 << COMN1SW_SHIFT))
#define MAX8997_ADC_GROUND 0x00
#define MAX8997_ADC_MHL 0x01
#define MAX8997_ADC_JIG_USB_1 0x18
#define MAX8997_ADC_JIG_USB_2 0x19
#define MAX8997_ADC_DESKDOCK 0x1a
#define MAX8997_ADC_JIG_UART 0x1c
#define MAX8997_ADC_CARDOCK 0x1d
#define MAX8997_ADC_OPEN 0x1f
struct max8997_muic_irq {
unsigned int irq;
const char *name;
};
static struct max8997_muic_irq muic_irqs[] = {
{ MAX8997_MUICIRQ_ADCError, "muic-ADC_error" },
{ MAX8997_MUICIRQ_ADCLow, "muic-ADC_low" },
{ MAX8997_MUICIRQ_ADC, "muic-ADC" },
{ MAX8997_MUICIRQ_VBVolt, "muic-VB_voltage" },
{ MAX8997_MUICIRQ_DBChg, "muic-DB_charger" },
{ MAX8997_MUICIRQ_DCDTmr, "muic-DCD_timer" },
{ MAX8997_MUICIRQ_ChgDetRun, "muic-CDR_status" },
{ MAX8997_MUICIRQ_ChgTyp, "muic-charger_type" },
{ MAX8997_MUICIRQ_OVP, "muic-over_voltage" },
};
struct max8997_muic_info {
struct device *dev;
struct max8997_dev *iodev;
struct i2c_client *muic;
struct max8997_muic_platform_data *muic_pdata;
int irq;
struct work_struct irq_work;
enum max8997_muic_charger_type pre_charger_type;
int pre_adc;
struct mutex mutex;
};
static int max8997_muic_handle_usb(struct max8997_muic_info *info,
enum max8997_muic_usb_type usb_type, bool attached)
{
struct max8997_muic_platform_data *mdata = info->muic_pdata;
int ret = 0;
if (usb_type == MAX8997_USB_HOST) {
/* switch to USB */
ret = max8997_update_reg(info->muic, MAX8997_MUIC_REG_CONTROL1,
attached ? MAX8997_SW_USB : MAX8997_SW_OPEN,
SW_MASK);
if (ret) {
dev_err(info->dev, "failed to update muic register\n");
goto out;
}
}
if (mdata->usb_callback)
mdata->usb_callback(usb_type, attached);
out:
return ret;
}
static void max8997_muic_handle_mhl(struct max8997_muic_info *info,
bool attached)
{
struct max8997_muic_platform_data *mdata = info->muic_pdata;
if (mdata->mhl_callback)
mdata->mhl_callback(attached);
}
static int max8997_muic_handle_dock(struct max8997_muic_info *info,
int adc, bool attached)
{
struct max8997_muic_platform_data *mdata = info->muic_pdata;
int ret = 0;
/* switch to AUDIO */
ret = max8997_update_reg(info->muic, MAX8997_MUIC_REG_CONTROL1,
attached ? MAX8997_SW_AUDIO : MAX8997_SW_OPEN,
SW_MASK);
if (ret) {
dev_err(info->dev, "failed to update muic register\n");
goto out;
}
switch (adc) {
case MAX8997_ADC_DESKDOCK:
if (mdata->deskdock_callback)
mdata->deskdock_callback(attached);
break;
case MAX8997_ADC_CARDOCK:
if (mdata->cardock_callback)
mdata->cardock_callback(attached);
break;
default:
break;
}
out:
return ret;
}
static int max8997_muic_handle_jig_uart(struct max8997_muic_info *info,
bool attached)
{
struct max8997_muic_platform_data *mdata = info->muic_pdata;
int ret = 0;
/* switch to UART */
ret = max8997_update_reg(info->muic, MAX8997_MUIC_REG_CONTROL1,
attached ? MAX8997_SW_UART : MAX8997_SW_OPEN,
SW_MASK);
if (ret) {
dev_err(info->dev, "failed to update muic register\n");
goto out;
}
if (mdata->uart_callback)
mdata->uart_callback(attached);
out:
return ret;
}
static int max8997_muic_handle_adc_detach(struct max8997_muic_info *info)
{
int ret = 0;
switch (info->pre_adc) {
case MAX8997_ADC_GROUND:
ret = max8997_muic_handle_usb(info, MAX8997_USB_HOST, false);
break;
case MAX8997_ADC_MHL:
max8997_muic_handle_mhl(info, false);
break;
case MAX8997_ADC_JIG_USB_1:
case MAX8997_ADC_JIG_USB_2:
ret = max8997_muic_handle_usb(info, MAX8997_USB_DEVICE, false);
break;
case MAX8997_ADC_DESKDOCK:
case MAX8997_ADC_CARDOCK:
ret = max8997_muic_handle_dock(info, info->pre_adc, false);
break;
case MAX8997_ADC_JIG_UART:
ret = max8997_muic_handle_jig_uart(info, false);
break;
default:
break;
}
return ret;
}
static int max8997_muic_handle_adc(struct max8997_muic_info *info, int adc)
{
int ret = 0;
switch (adc) {
case MAX8997_ADC_GROUND:
ret = max8997_muic_handle_usb(info, MAX8997_USB_HOST, true);
break;
case MAX8997_ADC_MHL:
max8997_muic_handle_mhl(info, true);
break;
case MAX8997_ADC_JIG_USB_1:
case MAX8997_ADC_JIG_USB_2:
ret = max8997_muic_handle_usb(info, MAX8997_USB_DEVICE, true);
break;
case MAX8997_ADC_DESKDOCK:
case MAX8997_ADC_CARDOCK:
ret = max8997_muic_handle_dock(info, adc, true);
break;
case MAX8997_ADC_JIG_UART:
ret = max8997_muic_handle_jig_uart(info, true);
break;
case MAX8997_ADC_OPEN:
ret = max8997_muic_handle_adc_detach(info);
break;
default:
break;
}
info->pre_adc = adc;
return ret;
}
static int max8997_muic_handle_charger_type(struct max8997_muic_info *info,
enum max8997_muic_charger_type charger_type)
{
struct max8997_muic_platform_data *mdata = info->muic_pdata;
u8 adc;
int ret;
ret = max8997_read_reg(info->muic, MAX8997_MUIC_REG_STATUS1, &adc);
if (ret) {
dev_err(info->dev, "failed to read muic register\n");
goto out;
}
switch (charger_type) {
case MAX8997_CHARGER_TYPE_NONE:
if (mdata->charger_callback)
mdata->charger_callback(false, charger_type);
if (info->pre_charger_type == MAX8997_CHARGER_TYPE_USB) {
max8997_muic_handle_usb(info,
MAX8997_USB_DEVICE, false);
}
break;
case MAX8997_CHARGER_TYPE_USB:
if ((adc & STATUS1_ADC_MASK) == MAX8997_ADC_OPEN) {
max8997_muic_handle_usb(info,
MAX8997_USB_DEVICE, true);
}
if (mdata->charger_callback)
mdata->charger_callback(true, charger_type);
break;
case MAX8997_CHARGER_TYPE_DOWNSTREAM_PORT:
case MAX8997_CHARGER_TYPE_DEDICATED_CHG:
case MAX8997_CHARGER_TYPE_500MA:
case MAX8997_CHARGER_TYPE_1A:
if (mdata->charger_callback)
mdata->charger_callback(true, charger_type);
break;
default:
break;
}
info->pre_charger_type = charger_type;
out:
return ret;
}
static void max8997_muic_irq_work(struct work_struct *work)
{
struct max8997_muic_info *info = container_of(work,
struct max8997_muic_info, irq_work);
struct max8997_platform_data *pdata =
dev_get_platdata(info->iodev->dev);
u8 status[3];
u8 adc, chg_type;
int irq_type = info->irq - pdata->irq_base;
int ret;
mutex_lock(&info->mutex);
ret = max8997_bulk_read(info->muic, MAX8997_MUIC_REG_STATUS1,
3, status);
if (ret) {
dev_err(info->dev, "failed to read muic register\n");
mutex_unlock(&info->mutex);
return;
}
dev_dbg(info->dev, "%s: STATUS1:0x%x, 2:0x%x\n", __func__,
status[0], status[1]);
switch (irq_type) {
case MAX8997_MUICIRQ_ADC:
adc = status[0] & STATUS1_ADC_MASK;
adc >>= STATUS1_ADC_SHIFT;
max8997_muic_handle_adc(info, adc);
break;
case MAX8997_MUICIRQ_ChgTyp:
chg_type = status[1] & STATUS2_CHGTYP_MASK;
chg_type >>= STATUS2_CHGTYP_SHIFT;
max8997_muic_handle_charger_type(info, chg_type);
break;
default:
dev_info(info->dev, "misc interrupt: %s occurred\n",
muic_irqs[irq_type].name);
break;
}
mutex_unlock(&info->mutex);
return;
}
static irqreturn_t max8997_muic_irq_handler(int irq, void *data)
{
struct max8997_muic_info *info = data;
dev_dbg(info->dev, "irq:%d\n", irq);
info->irq = irq;
schedule_work(&info->irq_work);
return IRQ_HANDLED;
}
static void max8997_muic_detect_dev(struct max8997_muic_info *info)
{
int ret;
u8 status[2], adc, chg_type;
ret = max8997_bulk_read(info->muic, MAX8997_MUIC_REG_STATUS1,
2, status);
if (ret) {
dev_err(info->dev, "failed to read muic register\n");
return;
}
dev_info(info->dev, "STATUS1:0x%x, STATUS2:0x%x\n",
status[0], status[1]);
adc = status[0] & STATUS1_ADC_MASK;
adc >>= STATUS1_ADC_SHIFT;
chg_type = status[1] & STATUS2_CHGTYP_MASK;
chg_type >>= STATUS2_CHGTYP_SHIFT;
max8997_muic_handle_adc(info, adc);
max8997_muic_handle_charger_type(info, chg_type);
}
static void max8997_initialize_device(struct max8997_muic_info *info)
{
struct max8997_muic_platform_data *mdata = info->muic_pdata;
int i;
for (i = 0; i < mdata->num_init_data; i++) {
max8997_write_reg(info->muic, mdata->init_data[i].addr,
mdata->init_data[i].data);
}
}
static int __devinit max8997_muic_probe(struct platform_device *pdev)
{
struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
struct max8997_platform_data *pdata = dev_get_platdata(iodev->dev);
struct max8997_muic_info *info;
int ret, i;
info = kzalloc(sizeof(struct max8997_muic_info), GFP_KERNEL);
if (!info) {
dev_err(&pdev->dev, "failed to allocate memory\n");
ret = -ENOMEM;
goto err_kfree;
}
if (!pdata->muic_pdata) {
dev_err(&pdev->dev, "failed to get platform_data\n");
ret = -EINVAL;
goto err_pdata;
}
info->muic_pdata = pdata->muic_pdata;
info->dev = &pdev->dev;
info->iodev = iodev;
info->muic = iodev->muic;
platform_set_drvdata(pdev, info);
mutex_init(&info->mutex);
INIT_WORK(&info->irq_work, max8997_muic_irq_work);
for (i = 0; i < ARRAY_SIZE(muic_irqs); i++) {
struct max8997_muic_irq *muic_irq = &muic_irqs[i];
ret = request_threaded_irq(pdata->irq_base + muic_irq->irq,
NULL, max8997_muic_irq_handler,
0, muic_irq->name,
info);
if (ret) {
dev_err(&pdev->dev,
"failed: irq request (IRQ: %d,"
" error :%d)\n",
muic_irq->irq, ret);
for (i = i - 1; i >= 0; i--)
free_irq(muic_irq->irq, info);
goto err_irq;
}
}
/* Initialize registers according to platform data */
max8997_initialize_device(info);
/* Initial device detection */
max8997_muic_detect_dev(info);
return ret;
err_irq:
err_pdata:
kfree(info);
err_kfree:
return ret;
}
static int __devexit max8997_muic_remove(struct platform_device *pdev)
{
struct max8997_muic_info *info = platform_get_drvdata(pdev);
struct max8997_platform_data *pdata =
dev_get_platdata(info->iodev->dev);
int i;
for (i = 0; i < ARRAY_SIZE(muic_irqs); i++)
free_irq(pdata->irq_base + muic_irqs[i].irq, info);
cancel_work_sync(&info->irq_work);
kfree(info);
return 0;
}
static struct platform_driver max8997_muic_driver = {
.driver = {
.name = "max8997-muic",
.owner = THIS_MODULE,
},
.probe = max8997_muic_probe,
.remove = __devexit_p(max8997_muic_remove),
};
static int __init max8997_muic_init(void)
{
return platform_driver_register(&max8997_muic_driver);
}
module_init(max8997_muic_init);
static void __exit max8997_muic_exit(void)
{
platform_driver_unregister(&max8997_muic_driver);
}
module_exit(max8997_muic_exit);
MODULE_DESCRIPTION("Maxim MAX8997 MUIC driver");
MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>");
MODULE_LICENSE("GPL");