diff options
Diffstat (limited to 'drivers/misc/max8997-muic.c')
| -rw-r--r-- | drivers/misc/max8997-muic.c | 505 |
1 files changed, 505 insertions, 0 deletions
diff --git a/drivers/misc/max8997-muic.c b/drivers/misc/max8997-muic.c new file mode 100644 index 000000000000..d74ef41aabd5 --- /dev/null +++ b/drivers/misc/max8997-muic.c @@ -0,0 +1,505 @@ +/* + * 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"); |