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