/* * max8997-muic.c - MAX8997 muic driver for the Maxim 8997 * * Copyright (C) 2011 Samsung Electrnoics * Donggeun Kim * * 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 #include #include #include #include #include #include #include #include #include /* 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); 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: while (--i >= 0) free_irq(pdata->irq_base + muic_irqs[i].irq, info); 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), }; module_platform_driver(max8997_muic_driver); MODULE_DESCRIPTION("Maxim MAX8997 MUIC driver"); MODULE_AUTHOR("Donggeun Kim "); MODULE_LICENSE("GPL");