455 lines
13 KiB
C
455 lines
13 KiB
C
/*
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* pmic_avp.c - Intel regulator Machine interface layer
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* Copyright (c) 2012, Intel Corporation.
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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/version.h> /*FIXME*/
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#include <linux/bug.h>
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#include <linux/err.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/regulator/driver.h>
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#include <linux/regulator/intel_pmic.h>
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#include <linux/regulator/machine.h>
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#include <linux/i2c.h>
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#include <linux/slab.h>
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#include <linux/mfd/intel_msic.h>
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/* Intel Voltage cntrl register parameters*/
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#define CTL_REG_MASK 0x07
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#define AOACCTL_REG_MASK 0x38
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#define REG_VSEL_MASK 0xC0
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#define VSEL_SHIFT 6
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#define REG_CTRL_MASK 0xF8
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/**
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*REGULATOR_MODE_FAST=REGULATOR_AUTO_MODE
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*REGULATOR_MODE_NORMAL= REGULATOR_NORMAL_MODE
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*REGULATOR_MODE_IDLE = Not applicable on intel platforms
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*REGULATOR_MODE_STANDBY=REGULATOR_LOW_POWER_MODE
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*/
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#define REGULATOR_NORMAL_MODE 0x07
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#define REGULATOR_AUTO_MODE 0x06
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#define REGULATOR_LOW_POWER_MODE 0x05
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#define REGULATOR_OFF_MODE 0x04
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#define MSIC_REG_ON 0x07
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#define MSIC_REG_OFF 0x04
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/* Intel regulator Error code */
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#define INTEL_REGULATOR_ERR -55
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static int reg_debug;
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#define MY_NAME "machine_interface"
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#define pmic_dbg(format, arg...) \
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do { \
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if (reg_debug) \
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printk(KERN_INFO "%s: " format, \
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MY_NAME , ## arg); \
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} while (0)
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#define pmic_err(format, arg...) \
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printk(KERN_ERR "%s: " format, \
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MY_NAME , ## arg)
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const u16 reg_addr_offset[] = { VPROG1CNT_ADDR, VPROG2CNT_ADDR, VEMMC1CNT_ADDR,
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VEMMC2CNT_ADDR };
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/**
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* intel_pmic_reg_is_enabled - To check if the regulator is enabled
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* @rdev: regulator_dev structure
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* @return value : 0 - Regulator is ON
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* :1 - Regulator is OFF
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*/
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static int intel_pmic_reg_is_enabled(struct regulator_dev *rdev)
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{
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struct intel_pmic_info *pmic_info = rdev_get_drvdata(rdev);
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u8 reg, mode;
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int ret;
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pmic_dbg("This is is_enabled function %s\n", rdev->desc->name);
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ret = intel_msic_reg_read(pmic_info->pmic_reg, ®);
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if (ret) {
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pmic_err("intel_msic_reg_read returns error %08x\n",
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ret);
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return INTEL_REGULATOR_ERR;
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}
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mode = reg & CTL_REG_MASK ;
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switch (mode) {
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case REGULATOR_NORMAL_MODE:
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case REGULATOR_AUTO_MODE:
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case REGULATOR_LOW_POWER_MODE:
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return 1;
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case REGULATOR_OFF_MODE:
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return 0;
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default:
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pmic_dbg("UNDEFINED MODE but returning OFF!!\n");
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return 0;
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}
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}
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/**
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* intel_pmic_reg_enable - To enable the regulator
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* @rdev: regulator_dev structure
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* @return value : 0 - Regulator enabling success
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* :1 - Regulator enabling failed
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*/
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static int intel_pmic_reg_enable(struct regulator_dev *rdev)
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{
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struct intel_pmic_info *pmic_info = rdev_get_drvdata(rdev);
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u8 reg;
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int ret;
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pmic_dbg("This is enable function for %s\n", rdev->desc->name);
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ret = intel_msic_reg_read(pmic_info->pmic_reg, ®);
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if (ret) {
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pmic_err("intel_msic_reg_read returns"
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"error %08x\n", ret);
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return INTEL_REGULATOR_ERR;
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}
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return intel_msic_reg_write(pmic_info->pmic_reg,
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((reg & REG_CTRL_MASK) | MSIC_REG_ON));
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}
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/**
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* intel_pmic_reg_disable - To disable the regulator
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* @rdev: regulator_dev structure
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* @return value :0 - Regulator disabling success
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* :1 - Regulator disabling failed
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*/
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static int intel_pmic_reg_disable(struct regulator_dev *rdev)
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{
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struct intel_pmic_info *pmic_info = rdev_get_drvdata(rdev);
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u8 reg;
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int ret;
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pmic_dbg("This is intel_pmic_reg_disable function for %s\n",
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rdev->desc->name);
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ret = intel_msic_reg_read(pmic_info->pmic_reg, ®);
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if (ret) {
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pmic_err("intel_msic_reg_read returns"
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"error %08x\n", ret);
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return INTEL_REGULATOR_ERR;
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}
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return intel_msic_reg_write(pmic_info->pmic_reg,
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((reg & REG_CTRL_MASK) | MSIC_REG_OFF));
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}
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/**
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* intel_pmic_reg_listvoltage - Return the voltage value,this is called
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* from core framework
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* @rdev: regulator source
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* @index : passed on from core
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* @return value : Returns the voltage value.
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*/
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static int intel_pmic_reg_listvoltage(struct regulator_dev *rdev,
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unsigned index)
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{
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struct intel_pmic_info *pmic_info = rdev_get_drvdata(rdev);
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if (index >= pmic_info->table_len) {
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pmic_err("Index out of range in listvoltage\n");
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return INTEL_REGULATOR_ERR;
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}
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return pmic_info->table[index] * 1000;
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}
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/**
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* intel_pmic_reg_getvoltage - Return the current voltage value in uV
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* @rdev: regulator_dev structure
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* @return value : Returns the voltage value.
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*/
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static int intel_pmic_reg_getvoltage(struct regulator_dev *rdev)
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{
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struct intel_pmic_info *pmic_info = rdev_get_drvdata(rdev);
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u8 reg, vsel;
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int ret;
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pmic_dbg("intel_pmic_reg_getvoltage function for %s\n",
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rdev->desc->name);
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ret = intel_msic_reg_read(pmic_info->pmic_reg, ®);
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if (ret) {
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pmic_err("intel_msic_reg_read returns"
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"error %08x\n", ret);
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return INTEL_REGULATOR_ERR;
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}
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vsel = (reg & REG_VSEL_MASK) >> VSEL_SHIFT;
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if (vsel >= pmic_info->table_len) {
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pmic_err("vsel value is out of range\n");
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return INTEL_REGULATOR_ERR;
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}
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pmic_dbg("Voltage value is %d mV\n",
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pmic_info->table[vsel]);
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return pmic_info->table[vsel] * 1000;
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}
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/**
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* intel_pmic_reg_setvoltage - Set voltage to the regulator
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* @rdev: regulator_dev structure
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* @min_uV: Minimum required voltage in uV
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* @max_uV: Maximum acceptable voltage in uV
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* @selector: Voltage value passed back to core layer
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* Sets a voltage regulator to the desired output voltage
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* @return value : Returns 0 if success
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* : Return INTEL_REGULATOR_ERR
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*/
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static int intel_pmic_reg_setvoltage(struct regulator_dev *rdev, int min_uV,
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int max_uV, unsigned *selector)
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{
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struct intel_pmic_info *pmic_info = rdev_get_drvdata(rdev);
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int ret;
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u8 reg, vsel;
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pmic_dbg("This is intel_pmic_reg_setvoltage function for %s\n",
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rdev->desc->name);
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for (vsel = 0; vsel < pmic_info->table_len; vsel++) {
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int mV = pmic_info->table[vsel];
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int uV = mV * 1000;
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if (min_uV <= uV && uV <= max_uV) {
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*selector = vsel;
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ret = intel_msic_reg_read(pmic_info->pmic_reg, ®);
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if (ret) {
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pmic_err("intel_msic_reg_read returns"
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"error %08x\n", ret);
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return INTEL_REGULATOR_ERR;
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}
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reg &= ~REG_VSEL_MASK;
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reg |= vsel << VSEL_SHIFT;
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pmic_dbg("intel_pmic_reg_setvoltage voltage is"
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"val %xuV\n", reg);
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return intel_msic_reg_write(pmic_info->pmic_reg,
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reg);
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}
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}
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return INTEL_REGULATOR_ERR;
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}
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/**
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* intel_pmic_reg_getmode - Get the regulator mode
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* @rdev: regulator_dev structure
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* Get the regulator mode
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* @return value : Returns mode
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* : Return INTEL_REGULATOR_ERR
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*/
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static unsigned int intel_pmic_reg_getmode(struct regulator_dev *rdev)
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{
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struct intel_pmic_info *pmic_info = rdev_get_drvdata(rdev);
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int ret;
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u8 reg, mode;
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pmic_dbg("This is intel_pmic_reg_getmode function for %s\n",
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rdev->desc->name);
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ret = intel_msic_reg_read(pmic_info->pmic_reg, ®);
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if (ret) {
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pmic_err("intel_msic_reg_read returns error %08x\n",
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ret);
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return INTEL_REGULATOR_ERR;
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}
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mode = (reg & CTL_REG_MASK);
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switch (mode) {
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case REGULATOR_NORMAL_MODE:
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return REGULATOR_MODE_NORMAL;
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case REGULATOR_AUTO_MODE:
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return REGULATOR_MODE_FAST;
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case REGULATOR_LOW_POWER_MODE:
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return REGULATOR_MODE_STANDBY;
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case REGULATOR_OFF_MODE:
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return REGULATOR_STATUS_OFF;
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default:
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pmic_dbg("Mode is not a valid one MODE %d", mode);
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}
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return INTEL_REGULATOR_ERR;
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}
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/**
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* intel_pmic_reg_setmode - Set the regulator mode
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* @rdev: regulator_dev structure
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* Set the regulator mode
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* @return value: Returns 0 if success
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: Return INTEL_REGULATOR_ERR
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*/
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static int intel_pmic_reg_setmode(struct regulator_dev *rdev, unsigned mode)
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{
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struct intel_pmic_info *pmic_info = rdev_get_drvdata(rdev);
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int ret;
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u8 reg, avp_mode;
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pmic_dbg("This is intel_pmic_reg_setmode function for %s\n",
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rdev->desc->name);
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ret = intel_msic_reg_read(pmic_info->pmic_reg, ®);
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if (ret) {
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pmic_err("intel_msic_reg_read returns error %08x\n",
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ret);
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return INTEL_REGULATOR_ERR;
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}
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reg &= ~CTL_REG_MASK;
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switch (mode) {
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case REGULATOR_MODE_NORMAL:
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avp_mode = REGULATOR_NORMAL_MODE;
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break;
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case REGULATOR_MODE_FAST:
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avp_mode = REGULATOR_AUTO_MODE;
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break;
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case REGULATOR_MODE_IDLE:
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case REGULATOR_MODE_STANDBY:
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avp_mode = REGULATOR_LOW_POWER_MODE;
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break;
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case REGULATOR_STATUS_OFF:
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avp_mode = REGULATOR_OFF_MODE;
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break;
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default:
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pmic_dbg("Mode is not a valid one MODE %d", mode);
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return INTEL_REGULATOR_ERR;
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}
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pmic_dbg("intel_pmic_reg_setmode is %d\n", avp_mode);
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return intel_msic_reg_write(pmic_info->pmic_reg, (reg|avp_mode));
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}
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/* regulator_ops registration */
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static struct regulator_ops intel_pmic_ops = {
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.is_enabled = intel_pmic_reg_is_enabled,
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.enable = intel_pmic_reg_enable,
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.disable = intel_pmic_reg_disable,
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.set_mode = intel_pmic_reg_setmode,
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.get_mode = intel_pmic_reg_getmode,
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.get_voltage = intel_pmic_reg_getvoltage,
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.set_voltage = intel_pmic_reg_setvoltage,
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.list_voltage = intel_pmic_reg_listvoltage,
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};
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/**
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* struct regulator_desc - Regulator descriptor
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* Each regulator registered with the core is described with a structure of
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* this type.
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* @name: Identifying name for the regulator.
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* @id: Numerical identifier for the regulator.
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* @n_voltages: Number of selectors available for ops.list_voltage().
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* @ops: Regulator operations table.
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* @irq: Interrupt number for the regulator.
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* @type: Indicates if the regulator is a voltage or current regulator.
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* @owner: Module providing the regulator, used for refcounting.
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*/
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static struct regulator_desc intel_pmic_desc[] = {
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{
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.name = "vprog1",
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.id = VPROG1,
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.ops = &intel_pmic_ops,
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.n_voltages = ARRAY_SIZE(VPROG1_VSEL_table),
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.type = REGULATOR_VOLTAGE,
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.owner = THIS_MODULE,
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},
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{
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.name = "vprog2",
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.id = VPROG2,
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.ops = &intel_pmic_ops,
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.n_voltages = ARRAY_SIZE(VPROG2_VSEL_table),
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.type = REGULATOR_VOLTAGE,
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.owner = THIS_MODULE,
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},
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{
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.name = "vemmc1",
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.id = VEMMC1,
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.ops = &intel_pmic_ops,
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.n_voltages = ARRAY_SIZE(VEMMC1_VSEL_table),
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.type = REGULATOR_VOLTAGE,
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.owner = THIS_MODULE,
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},
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{
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.name = "vemmc2",
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.id = VEMMC2,
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.ops = &intel_pmic_ops,
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.n_voltages = ARRAY_SIZE(VEMMC2_VSEL_table),
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.type = REGULATOR_VOLTAGE,
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.owner = THIS_MODULE,
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},
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};
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static int avp_pmic_probe(struct platform_device *pdev)
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{
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struct intel_pmic_info *pdata = dev_get_platdata(&pdev->dev);
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int i;
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struct intel_pmic_info *intel_pmic;
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if (!pdata || !pdata->pmic_reg)
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return -EINVAL;
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intel_pmic = pdev->dev.platform_data;
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if (!intel_pmic)
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return -EINVAL;
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for (i = 0; i < ARRAY_SIZE(reg_addr_offset); i++) {
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if (reg_addr_offset[i] == pdata->pmic_reg)
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break;
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}
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if (i < (ARRAY_SIZE(reg_addr_offset))) {
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platform_set_drvdata(pdev, intel_pmic->intel_pmic_rdev);
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#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 5, 0))
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{
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struct regulator_config config = { 0 };
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config.dev = &pdev->dev;
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config.init_data = pdata->init_data;
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config.driver_data = pdata;
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intel_pmic->intel_pmic_rdev =
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regulator_register(&intel_pmic_desc[i], &config);
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}
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#else
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intel_pmic->intel_pmic_rdev =
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regulator_register(&intel_pmic_desc[i],
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&pdev->dev, pdata->init_data, pdata,
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pdev->dev.of_node);
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#endif
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if (IS_ERR(intel_pmic->intel_pmic_rdev)) {
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pmic_err("can't register regulator..error %ld\n",
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PTR_ERR(intel_pmic->intel_pmic_rdev));
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return PTR_ERR(intel_pmic->intel_pmic_rdev);
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}
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dev_dbg(&pdev->dev, "registered regulator\n");
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return 0;
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}
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return INTEL_REGULATOR_ERR;
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}
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static int avp_pmic_remove(struct platform_device *pdev)
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{
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regulator_unregister(platform_get_drvdata(pdev));
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return 0;
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}
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static const struct platform_device_id avp_id_table[] = {
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{ "intel_regulator", 0 },
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{ },
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};
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MODULE_DEVICE_TABLE(platform, avp_id_table);
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static struct platform_driver avp_pmic_driver = {
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.driver = {
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.name = "intel_regulator",
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.owner = THIS_MODULE,
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},
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.probe = avp_pmic_probe,
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.remove = avp_pmic_remove,
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.id_table = avp_id_table,
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};
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static int __init avp_pmic_init(void)
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{
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return platform_driver_register(&avp_pmic_driver);
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}
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subsys_initcall(avp_pmic_init);
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static void __exit avp_pmic_exit(void)
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{
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platform_driver_unregister(&avp_pmic_driver);
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}
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module_exit(avp_pmic_exit);
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MODULE_DESCRIPTION("AVP voltage regulator driver");
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MODULE_AUTHOR("Vishwesh/Mahesh");
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MODULE_LICENSE("GPL v2");
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