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misc: Add driver support for MAX8997 MUIC 

The MUIC function in MAX8997 device can be used as
a USB port detector and switch.
This patch supports the MUIC feature of MAX8997.

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>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Donggeun Kim 2011-11-24 18:12:18 +09:00 committed by Samuel Ortiz
parent 2439d9714e
commit 99f09bebbe
3 changed files with 643 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/misc/Kconfig
View File

@ -500,6 +500,14 @@ config USB_SWITCH_FSA9480
stereo and mono audio, video, microphone and UART data to use
a common connector port.
config MAX8997_MUIC
tristate "MAX8997 MUIC Support"
depends on MFD_MAX8997
help
If you say yes here you get support for the MUIC device of
Maxim MAX8997 PMIC.
The MAX8997 MUIC is a USB port accessory detector and switch.
source "drivers/misc/c2port/Kconfig"
source "drivers/misc/eeprom/Kconfig"
source "drivers/misc/cb710/Kconfig"

1
drivers/misc/Makefile
View File

@ -48,3 +48,4 @@ obj-y += lis3lv02d/
obj-y += carma/
obj-$(CONFIG_USB_SWITCH_FSA9480) += fsa9480.o
obj-$(CONFIG_ALTERA_STAPL) +=altera-stapl/
obj-$(CONFIG_MAX8997_MUIC) += max8997-muic.o

634
drivers/misc/max8997-muic.c Normal file
View File

@ -0,0 +1,634 @@
/*
* 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);
char env_name_str[30], env_state_str[15];
char *envp[] = { env_name_str, env_state_str, NULL };
u8 status[3];
u8 adc, adc_low, adc_err;
u8 vb_volt, db_chg, dcd_tmr, cdr, chg_type, ovp;
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_ADCError:
adc_err = status[0] & STATUS1_ADCERR_MASK;
adc_err >>= STATUS1_ADCERR_SHIFT;
sprintf(env_name_str, "IRQ=%s", "ADC_Error");
sprintf(env_state_str, "STATE=%d", adc_err);
break;
case MAX8997_MUICIRQ_ADCLow:
adc_low = status[0] & STATUS1_ADCLOW_MASK;
adc_low >>= STATUS1_ADCLOW_SHIFT;
sprintf(env_name_str, "IRQ=%s", "ADC_Low");
sprintf(env_state_str, "STATE=%d", adc_low);
break;
case MAX8997_MUICIRQ_ADC:
adc = status[0] & STATUS1_ADC_MASK;
adc >>= STATUS1_ADC_SHIFT;
max8997_muic_handle_adc(info, adc);
sprintf(env_name_str, "IRQ=%s", "ADC");
sprintf(env_state_str, "STATE=%d", adc);
break;
case MAX8997_MUICIRQ_VBVolt:
vb_volt = status[1] & STATUS2_VBVOLT_MASK;
vb_volt >>= STATUS2_VBVOLT_SHIFT;
sprintf(env_name_str, "IRQ=%s", "VB_Volt");
sprintf(env_state_str, "STATE=%d", vb_volt);
break;
case MAX8997_MUICIRQ_DBChg:
db_chg = status[1] & STATUS2_DBCHG_MASK;
db_chg >>= STATUS2_DBCHG_SHIFT;
sprintf(env_name_str, "IRQ=%s", "DB_CHARGER");
sprintf(env_state_str, "STATE=%d", db_chg);
break;
case MAX8997_MUICIRQ_DCDTmr:
dcd_tmr = status[1] & STATUS2_DCDTMR_MASK;
dcd_tmr >>= STATUS2_DCDTMR_SHIFT;
sprintf(env_name_str, "IRQ=%s", "DCD_TIMER");
sprintf(env_state_str, "STATE=%d", dcd_tmr);
break;
case MAX8997_MUICIRQ_ChgDetRun:
cdr = status[1] & STATUS2_CHGDETRUN_MASK;
cdr >>= STATUS2_CHGDETRUN_SHIFT;
sprintf(env_name_str, "IRQ=%s", "CHG_DET_RUN");
sprintf(env_state_str, "STATE=%d", cdr);
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);
sprintf(env_name_str, "IRQ=%s", "CHARGER_TYPE");
sprintf(env_state_str, "STATE=%d", chg_type);
break;
case MAX8997_MUICIRQ_OVP:
ovp = status[2] & STATUS3_OVP_MASK;
ovp >>= STATUS3_OVP_SHIFT;
sprintf(env_name_str, "IRQ=%s", "OVER-VOLTAGE");
sprintf(env_state_str, "STATE=%d", ovp);
break;
default:
break;
}
kobject_uevent_env(&info->dev->kobj, KOBJ_CHANGE, envp);
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 ssize_t max8997_muic_show_manualsw(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct max8997_muic_info *info = dev_get_drvdata(dev);
int ret;
u8 value, manual_switch;
ret = max8997_read_reg(info->muic, MAX8997_MUIC_REG_CONTROL1, &value);
if (ret) {
dev_err(info->dev, "failed to read muic register\n");
return sprintf(buf, "UNKNOWN\n");
}
manual_switch = value & (COMN1SW_MASK | COMP2SW_MASK);
switch (manual_switch) {
case MAX8997_SW_USB:
return sprintf(buf, "USB\n");
case MAX8997_SW_AUDIO:
return sprintf(buf, "AUDIO\n");
case MAX8997_SW_UART:
return sprintf(buf, "UART\n");
default:
return sprintf(buf, "OPEN\n");
}
}
static ssize_t max8997_muic_store_manualsw(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct max8997_muic_info *info = dev_get_drvdata(dev);
int ret;
u8 manual_switch;
if (!strncmp(buf, "USB", 3)) {
manual_switch = MAX8997_SW_USB;
} else if (!strncmp(buf, "AUDIO", 5)) {
manual_switch = MAX8997_SW_AUDIO;
} else if (!strncmp(buf, "UART", 4)) {
manual_switch = MAX8997_SW_UART;
} else if (!strncmp(buf, "OPEN", 4)) {
manual_switch = MAX8997_SW_OPEN;
} else {
dev_err(info->dev, "invalid parameter\n");
goto out;
}
ret = max8997_update_reg(info->muic, MAX8997_MUIC_REG_CONTROL1,
manual_switch, SW_MASK);
if (ret)
dev_err(info->dev, "failed to update muic register\n");
out:
return count;
}
static DEVICE_ATTR(switch, S_IRUGO | S_IWUSR,
max8997_muic_show_manualsw, max8997_muic_store_manualsw);
static struct attribute *max8997_muic_attributes[] = {
&dev_attr_switch.attr,
NULL
};
static const struct attribute_group max8997_muic_group = {
.attrs = max8997_muic_attributes,
};
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);
ret = sysfs_create_group(&pdev->dev.kobj, &max8997_muic_group);
if (ret) {
dev_err(&pdev->dev,
"failed to create max8997 muic attribute group\n");
goto err_sysfs;
}
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:
sysfs_remove_group(&pdev->dev.kobj, &max8997_muic_group);
err_sysfs:
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;
sysfs_remove_group(&pdev->dev.kobj, &max8997_muic_group);
for (i = 0; i < ARRAY_SIZE(muic_irqs); i++)
free_irq(pdata->irq_base + muic_irqs[i].irq, info);
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");