mfd: Add TI TPS80031 mfd core driver

TPS80031/ TPS80032 Fully Integrated Power Management with Power
Path and Battery Charger. The device provides five configurable
step-down converters, 11 general purpose LDOs, USB OTG Module,
ADC, RTC, 2 PWM, System Voltage Regulator/Battery Charger with
Power Path from USB, 32K clock generator.

Add the mfd core driver for TPS80031/TPS80032.

Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Reviwed-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

1 files changed, 573 insertions, 0 deletions

diff --git a/drivers/mfd/tps80031.c b/drivers/mfd/tps80031.c
new file mode 100644
index 000000000000..f64005efa6fa
--- /dev/null
+++ b/drivers/mfd/tps80031.c
@@ -0,0 +1,573 @@
+/*
+ * tps80031.c -- TI TPS80031/TPS80032 mfd core driver.
+ *
+ * MFD core driver for TI TPS80031/TPS80032 Fully Integrated
+ * Power Management with Power Path and Battery Charger
+ *
+ * Copyright (c) 2012, NVIDIA Corporation.
+ *
+ * Author: Laxman Dewangan <ldewangan@nvidia.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 version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,
+ * whether express or implied; 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/err.h>
+#include <linux/i2c.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/tps80031.h>
+#include <linux/module.h>
+#include <linux/pm.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+
+static struct resource tps80031_rtc_resources[] = {
+        {
+                .start = TPS80031_INT_RTC_ALARM,
+                .end = TPS80031_INT_RTC_ALARM,
+                .flags = IORESOURCE_IRQ,
+        },
+};
+
+/* TPS80031 sub mfd devices */
+static struct mfd_cell tps80031_cell[] = {
+        {
+                .name = "tps80031-pmic",
+        },
+        {
+                .name = "tps80031-clock",
+        },
+        {
+                .name = "tps80031-rtc",
+                .num_resources = ARRAY_SIZE(tps80031_rtc_resources),
+                .resources = tps80031_rtc_resources,
+        },
+        {
+                .name = "tps80031-gpadc",
+        },
+        {
+                .name = "tps80031-fuel-gauge",
+        },
+        {
+                .name = "tps80031-charger",
+        },
+};
+
+static int tps80031_slave_address[TPS80031_NUM_SLAVES] = {
+        TPS80031_I2C_ID0_ADDR,
+        TPS80031_I2C_ID1_ADDR,
+        TPS80031_I2C_ID2_ADDR,
+        TPS80031_I2C_ID3_ADDR,
+};
+
+struct tps80031_pupd_data {
+        u8      reg;
+        u8      pullup_bit;
+        u8      pulldown_bit;
+};
+
+#define TPS80031_IRQ(_reg, _mask)                       \
+        {                                                       \
+                .reg_offset = (TPS80031_INT_MSK_LINE_##_reg) -  \
+                                TPS80031_INT_MSK_LINE_A,        \
+                .mask = BIT(_mask),                             \
+        }
+
+static const struct regmap_irq tps80031_main_irqs[] = {
+        [TPS80031_INT_PWRON]            = TPS80031_IRQ(A, 0),
+        [TPS80031_INT_RPWRON]           = TPS80031_IRQ(A, 1),
+        [TPS80031_INT_SYS_VLOW]         = TPS80031_IRQ(A, 2),
+        [TPS80031_INT_RTC_ALARM]        = TPS80031_IRQ(A, 3),
+        [TPS80031_INT_RTC_PERIOD]       = TPS80031_IRQ(A, 4),
+        [TPS80031_INT_HOT_DIE]          = TPS80031_IRQ(A, 5),
+        [TPS80031_INT_VXX_SHORT]        = TPS80031_IRQ(A, 6),
+        [TPS80031_INT_SPDURATION]       = TPS80031_IRQ(A, 7),
+        [TPS80031_INT_WATCHDOG]         = TPS80031_IRQ(B, 0),
+        [TPS80031_INT_BAT]              = TPS80031_IRQ(B, 1),
+        [TPS80031_INT_SIM]              = TPS80031_IRQ(B, 2),
+        [TPS80031_INT_MMC]              = TPS80031_IRQ(B, 3),
+        [TPS80031_INT_RES]              = TPS80031_IRQ(B, 4),
+        [TPS80031_INT_GPADC_RT]         = TPS80031_IRQ(B, 5),
+        [TPS80031_INT_GPADC_SW2_EOC]    = TPS80031_IRQ(B, 6),
+        [TPS80031_INT_CC_AUTOCAL]       = TPS80031_IRQ(B, 7),
+        [TPS80031_INT_ID_WKUP]          = TPS80031_IRQ(C, 0),
+        [TPS80031_INT_VBUSS_WKUP]       = TPS80031_IRQ(C, 1),
+        [TPS80031_INT_ID]               = TPS80031_IRQ(C, 2),
+        [TPS80031_INT_VBUS]             = TPS80031_IRQ(C, 3),
+        [TPS80031_INT_CHRG_CTRL]        = TPS80031_IRQ(C, 4),
+        [TPS80031_INT_EXT_CHRG]         = TPS80031_IRQ(C, 5),
+        [TPS80031_INT_INT_CHRG]         = TPS80031_IRQ(C, 6),
+        [TPS80031_INT_RES2]             = TPS80031_IRQ(C, 7),
+};
+
+static struct regmap_irq_chip tps80031_irq_chip = {
+        .name = "tps80031",
+        .irqs = tps80031_main_irqs,
+        .num_irqs = ARRAY_SIZE(tps80031_main_irqs),
+        .num_regs = 3,
+        .status_base = TPS80031_INT_STS_A,
+        .mask_base = TPS80031_INT_MSK_LINE_A,
+};
+
+#define PUPD_DATA(_reg, _pulldown_bit, _pullup_bit)     \
+        {                                               \
+                .reg = TPS80031_CFG_INPUT_PUPD##_reg,   \
+                .pulldown_bit = _pulldown_bit,          \
+                .pullup_bit = _pullup_bit,              \
+        }
+
+static const struct tps80031_pupd_data tps80031_pupds[] = {
+        [TPS80031_PREQ1]                = PUPD_DATA(1, BIT(0),  BIT(1)),
+        [TPS80031_PREQ2A]               = PUPD_DATA(1, BIT(2),  BIT(3)),
+        [TPS80031_PREQ2B]               = PUPD_DATA(1, BIT(4),  BIT(5)),
+        [TPS80031_PREQ2C]               = PUPD_DATA(1, BIT(6),  BIT(7)),
+        [TPS80031_PREQ3]                = PUPD_DATA(2, BIT(0),  BIT(1)),
+        [TPS80031_NRES_WARM]            = PUPD_DATA(2, 0,       BIT(2)),
+        [TPS80031_PWM_FORCE]            = PUPD_DATA(2, BIT(5),  0),
+        [TPS80031_CHRG_EXT_CHRG_STATZ]  = PUPD_DATA(2, 0,       BIT(6)),
+        [TPS80031_SIM]                  = PUPD_DATA(3, BIT(0),  BIT(1)),
+        [TPS80031_MMC]                  = PUPD_DATA(3, BIT(2),  BIT(3)),
+        [TPS80031_GPADC_START]          = PUPD_DATA(3, BIT(4),  0),
+        [TPS80031_DVSI2C_SCL]           = PUPD_DATA(4, 0,       BIT(0)),
+        [TPS80031_DVSI2C_SDA]           = PUPD_DATA(4, 0,       BIT(1)),
+        [TPS80031_CTLI2C_SCL]           = PUPD_DATA(4, 0,       BIT(2)),
+        [TPS80031_CTLI2C_SDA]           = PUPD_DATA(4, 0,       BIT(3)),
+};
+static struct tps80031 *tps80031_power_off_dev;
+
+int tps80031_ext_power_req_config(struct device *dev,
+                unsigned long ext_ctrl_flag, int preq_bit,
+                int state_reg_add, int trans_reg_add)
+{
+        u8 res_ass_reg = 0;
+        int preq_mask_bit = 0;
+        int ret;
+
+        if (!(ext_ctrl_flag & TPS80031_EXT_PWR_REQ))
+                return 0;
+
+        if (ext_ctrl_flag & TPS80031_PWR_REQ_INPUT_PREQ1) {
+                res_ass_reg = TPS80031_PREQ1_RES_ASS_A + (preq_bit >> 3);
+                preq_mask_bit = 5;
+        } else if (ext_ctrl_flag & TPS80031_PWR_REQ_INPUT_PREQ2) {
+                res_ass_reg = TPS80031_PREQ2_RES_ASS_A + (preq_bit >> 3);
+                preq_mask_bit = 6;
+        } else if (ext_ctrl_flag & TPS80031_PWR_REQ_INPUT_PREQ3) {
+                res_ass_reg = TPS80031_PREQ3_RES_ASS_A + (preq_bit >> 3);
+                preq_mask_bit = 7;
+        }
+
+        /* Configure REQ_ASS registers */
+        ret = tps80031_set_bits(dev, TPS80031_SLAVE_ID1, res_ass_reg,
+                                        BIT(preq_bit & 0x7));
+        if (ret < 0) {
+                dev_err(dev, "reg 0x%02x setbit failed, err = %d\n",
+                                res_ass_reg, ret);
+                return ret;
+        }
+
+        /* Unmask the PREQ */
+        ret = tps80031_clr_bits(dev, TPS80031_SLAVE_ID1,
+                        TPS80031_PHOENIX_MSK_TRANSITION, BIT(preq_mask_bit));
+        if (ret < 0) {
+                dev_err(dev, "reg 0x%02x clrbit failed, err = %d\n",
+                        TPS80031_PHOENIX_MSK_TRANSITION, ret);
+                return ret;
+        }
+
+        /* Switch regulator control to resource now */
+        if (ext_ctrl_flag & (TPS80031_PWR_REQ_INPUT_PREQ2 |
+                                        TPS80031_PWR_REQ_INPUT_PREQ3)) {
+                ret = tps80031_update(dev, TPS80031_SLAVE_ID1, state_reg_add,
+                                                0x0, TPS80031_STATE_MASK);
+                if (ret < 0)
+                        dev_err(dev, "reg 0x%02x update failed, err = %d\n",
+                                state_reg_add, ret);
+        } else {
+                ret = tps80031_update(dev, TPS80031_SLAVE_ID1, trans_reg_add,
+                                TPS80031_TRANS_SLEEP_OFF,
+                                TPS80031_TRANS_SLEEP_MASK);
+                if (ret < 0)
+                        dev_err(dev, "reg 0x%02x update failed, err = %d\n",
+                                trans_reg_add, ret);
+        }
+        return ret;
+}
+EXPORT_SYMBOL_GPL(tps80031_ext_power_req_config);
+
+static void tps80031_power_off(void)
+{
+        dev_info(tps80031_power_off_dev->dev, "switching off PMU\n");
+        tps80031_write(tps80031_power_off_dev->dev, TPS80031_SLAVE_ID1,
+                                TPS80031_PHOENIX_DEV_ON, TPS80031_DEVOFF);
+}
+
+static void tps80031_pupd_init(struct tps80031 *tps80031,
+                               struct tps80031_platform_data *pdata)
+{
+        struct tps80031_pupd_init_data *pupd_init_data = pdata->pupd_init_data;
+        int data_size = pdata->pupd_init_data_size;
+        int i;
+
+        for (i = 0; i < data_size; ++i) {
+                struct tps80031_pupd_init_data *pupd_init = &pupd_init_data[i];
+                const struct tps80031_pupd_data *pupd =
+                        &tps80031_pupds[pupd_init->input_pin];
+                u8 update_value = 0;
+                u8 update_mask = pupd->pulldown_bit | pupd->pullup_bit;
+
+                if (pupd_init->setting == TPS80031_PUPD_PULLDOWN)
+                        update_value = pupd->pulldown_bit;
+                else if (pupd_init->setting == TPS80031_PUPD_PULLUP)
+                        update_value = pupd->pullup_bit;
+
+                tps80031_update(tps80031->dev, TPS80031_SLAVE_ID1, pupd->reg,
+                                update_value, update_mask);
+        }
+}
+
+static int tps80031_init_ext_control(struct tps80031 *tps80031,
+                        struct tps80031_platform_data *pdata)
+{
+        struct device *dev = tps80031->dev;
+        int ret;
+        int i;
+
+        /* Clear all external control for this rail */
+        for (i = 0; i < 9; ++i) {
+                ret = tps80031_write(dev, TPS80031_SLAVE_ID1,
+                                TPS80031_PREQ1_RES_ASS_A + i, 0);
+                if (ret < 0) {
+                        dev_err(dev, "reg 0x%02x write failed, err = %d\n",
+                                TPS80031_PREQ1_RES_ASS_A + i, ret);
+                        return ret;
+                }
+        }
+
+        /* Mask the PREQ */
+        ret = tps80031_set_bits(dev, TPS80031_SLAVE_ID1,
+                        TPS80031_PHOENIX_MSK_TRANSITION, 0x7 << 5);
+        if (ret < 0) {
+                dev_err(dev, "reg 0x%02x set_bits failed, err = %d\n",
+                        TPS80031_PHOENIX_MSK_TRANSITION, ret);
+                return ret;
+        }
+        return ret;
+}
+
+static int __devinit tps80031_irq_init(struct tps80031 *tps80031, int irq,
+                                int irq_base)
+{
+        struct device *dev = tps80031->dev;
+        int i, ret;
+
+        /*
+         * The MASK register used for updating status register when
+         * interrupt occurs and LINE register used to pass the status
+         * to actual interrupt line.  As per datasheet:
+         * When INT_MSK_LINE [i] is set to 1, the associated interrupt
+         * number i is INT line masked, which means that no interrupt is
+         * generated on the INT line.
+         * When INT_MSK_LINE [i] is set to 0, the associated interrupt
+         * number i is  line enabled: An interrupt is generated on the
+         * INT line.
+         * In any case, the INT_STS [i] status bit may or may not be updated,
+         * only linked to the INT_MSK_STS [i] configuration register bit.
+         *
+         * When INT_MSK_STS [i] is set to 1, the associated interrupt number
+         * i is status masked, which means that no interrupt is stored in
+         * the INT_STS[i] status bit. Note that no interrupt number i is
+         * generated on the INT line, even if the INT_MSK_LINE [i] register
+         * bit is set to 0.
+         * When INT_MSK_STS [i] is set to 0, the associated interrupt number i
+         * is status enabled: An interrupt status is updated in the INT_STS [i]
+         * register. The interrupt may or may not be generated on the INT line,
+         * depending on the INT_MSK_LINE [i] configuration register bit.
+         */
+        for (i = 0; i < 3; i++)
+                tps80031_write(dev, TPS80031_SLAVE_ID2,
+                                TPS80031_INT_MSK_STS_A + i, 0x00);
+
+        ret = regmap_add_irq_chip(tps80031->regmap[TPS80031_SLAVE_ID2], irq,
+                        IRQF_ONESHOT, irq_base,
+                        &tps80031_irq_chip, &tps80031->irq_data);
+        if (ret < 0) {
+                dev_err(dev, "add irq failed, err = %d\n", ret);
+                return ret;
+        }
+        return ret;
+}
+
+static bool rd_wr_reg_id0(struct device *dev, unsigned int reg)
+{
+        switch (reg) {
+        case TPS80031_SMPS1_CFG_FORCE ... TPS80031_SMPS2_CFG_VOLTAGE:
+                return true;
+        default:
+                return false;
+        }
+}
+
+static bool rd_wr_reg_id1(struct device *dev, unsigned int reg)
+{
+        switch (reg) {
+        case TPS80031_SECONDS_REG ... TPS80031_RTC_RESET_STATUS_REG:
+        case TPS80031_VALIDITY0 ... TPS80031_VALIDITY7:
+        case TPS80031_PHOENIX_START_CONDITION ... TPS80031_KEY_PRESS_DUR_CFG:
+        case TPS80031_SMPS4_CFG_TRANS ... TPS80031_SMPS3_CFG_VOLTAGE:
+        case TPS80031_BROADCAST_ADDR_ALL ... TPS80031_BROADCAST_ADDR_CLK_RST:
+        case TPS80031_VANA_CFG_TRANS ... TPS80031_LDO7_CFG_VOLTAGE:
+        case TPS80031_REGEN1_CFG_TRANS ... TPS80031_TMP_CFG_STATE:
+        case TPS80031_PREQ1_RES_ASS_A ... TPS80031_PREQ3_RES_ASS_C:
+        case TPS80031_SMPS_OFFSET ... TPS80031_BATDEBOUNCING:
+        case TPS80031_CFG_INPUT_PUPD1 ... TPS80031_CFG_SMPS_PD:
+        case TPS80031_BACKUP_REG:
+                return true;
+        default:
+                return false;
+        }
+}
+
+static bool is_volatile_reg_id1(struct device *dev, unsigned int reg)
+{
+        switch (reg) {
+        case TPS80031_SMPS4_CFG_TRANS ... TPS80031_SMPS3_CFG_VOLTAGE:
+        case TPS80031_VANA_CFG_TRANS ... TPS80031_LDO7_CFG_VOLTAGE:
+        case TPS80031_REGEN1_CFG_TRANS ... TPS80031_TMP_CFG_STATE:
+        case TPS80031_PREQ1_RES_ASS_A ... TPS80031_PREQ3_RES_ASS_C:
+        case TPS80031_SMPS_OFFSET ... TPS80031_BATDEBOUNCING:
+        case TPS80031_CFG_INPUT_PUPD1 ... TPS80031_CFG_SMPS_PD:
+                return true;
+        default:
+                return false;
+        }
+}
+
+static bool rd_wr_reg_id2(struct device *dev, unsigned int reg)
+{
+        switch (reg) {
+        case TPS80031_USB_VENDOR_ID_LSB ... TPS80031_USB_OTG_REVISION:
+        case TPS80031_GPADC_CTRL ... TPS80031_CTRL_P1:
+        case TPS80031_RTCH0_LSB ... TPS80031_GPCH0_MSB:
+        case TPS80031_TOGGLE1 ... TPS80031_VIBMODE:
+        case TPS80031_PWM1ON ... TPS80031_PWM2OFF:
+        case TPS80031_FG_REG_00 ... TPS80031_FG_REG_11:
+        case TPS80031_INT_STS_A ... TPS80031_INT_MSK_STS_C:
+        case TPS80031_CONTROLLER_CTRL2 ... TPS80031_LED_PWM_CTRL2:
+                return true;
+        default:
+                return false;
+        }
+}
+
+static bool rd_wr_reg_id3(struct device *dev, unsigned int reg)
+{
+        switch (reg) {
+        case TPS80031_GPADC_TRIM0 ... TPS80031_GPADC_TRIM18:
+                return true;
+        default:
+                return false;
+        }
+}
+
+static const struct regmap_config tps80031_regmap_configs[] = {
+        {
+                .reg_bits = 8,
+                .val_bits = 8,
+                .writeable_reg = rd_wr_reg_id0,
+                .readable_reg = rd_wr_reg_id0,
+                .max_register = TPS80031_MAX_REGISTER,
+        },
+        {
+                .reg_bits = 8,
+                .val_bits = 8,
+                .writeable_reg = rd_wr_reg_id1,
+                .readable_reg = rd_wr_reg_id1,
+                .volatile_reg = is_volatile_reg_id1,
+                .max_register = TPS80031_MAX_REGISTER,
+        },
+        {
+                .reg_bits = 8,
+                .val_bits = 8,
+                .writeable_reg = rd_wr_reg_id2,
+                .readable_reg = rd_wr_reg_id2,
+                .max_register = TPS80031_MAX_REGISTER,
+        },
+        {
+                .reg_bits = 8,
+                .val_bits = 8,
+                .writeable_reg = rd_wr_reg_id3,
+                .readable_reg = rd_wr_reg_id3,
+                .max_register = TPS80031_MAX_REGISTER,
+        },
+};
+
+static int __devinit tps80031_probe(struct i2c_client *client,
+                                        const struct i2c_device_id *id)
+{
+        struct tps80031_platform_data *pdata = client->dev.platform_data;
+        struct tps80031 *tps80031;
+        int ret;
+        uint8_t es_version;
+        uint8_t ep_ver;
+        int i;
+
+        if (!pdata) {
+                dev_err(&client->dev, "tps80031 requires platform data\n");
+                return -EINVAL;
+        }
+
+        tps80031 = devm_kzalloc(&client->dev, sizeof(*tps80031), GFP_KERNEL);
+        if (!tps80031) {
+                dev_err(&client->dev, "Malloc failed for tps80031\n");
+                return -ENOMEM;
+        }
+
+        for (i = 0; i < TPS80031_NUM_SLAVES; i++) {
+                if (tps80031_slave_address[i] == client->addr)
+                        tps80031->clients[i] = client;
+                else
+                        tps80031->clients[i] = i2c_new_dummy(client->adapter,
+                                                tps80031_slave_address[i]);
+                if (!tps80031->clients[i]) {
+                        dev_err(&client->dev, "can't attach client %d\n", i);
+                        ret = -ENOMEM;
+                        goto fail_client_reg;
+                }
+
+                i2c_set_clientdata(tps80031->clients[i], tps80031);
+                tps80031->regmap[i] = devm_regmap_init_i2c(tps80031->clients[i],
+                                        &tps80031_regmap_configs[i]);
+                if (IS_ERR(tps80031->regmap[i])) {
+                        ret = PTR_ERR(tps80031->regmap[i]);
+                        dev_err(&client->dev,
+                                "regmap %d init failed, err %d\n", i, ret);
+                        goto fail_client_reg;
+                }
+        }
+
+        ret = tps80031_read(&client->dev, TPS80031_SLAVE_ID3,
+                        TPS80031_JTAGVERNUM, &es_version);
+        if (ret < 0) {
+                dev_err(&client->dev,
+                        "Silicon version number read failed: %d\n", ret);
+                goto fail_client_reg;
+        }
+
+        ret = tps80031_read(&client->dev, TPS80031_SLAVE_ID3,
+                        TPS80031_EPROM_REV, &ep_ver);
+        if (ret < 0) {
+                dev_err(&client->dev,
+                        "Silicon eeprom version read failed: %d\n", ret);
+                goto fail_client_reg;
+        }
+
+        dev_info(&client->dev, "ES version 0x%02x and EPROM version 0x%02x\n",
+                                        es_version, ep_ver);
+        tps80031->es_version = es_version;
+        tps80031->dev = &client->dev;
+        i2c_set_clientdata(client, tps80031);
+        tps80031->chip_info = id->driver_data;
+
+        ret = tps80031_irq_init(tps80031, client->irq, pdata->irq_base);
+        if (ret) {
+                dev_err(&client->dev, "IRQ init failed: %d\n", ret);
+                goto fail_client_reg;
+        }
+
+        tps80031_pupd_init(tps80031, pdata);
+
+        tps80031_init_ext_control(tps80031, pdata);
+
+        ret = mfd_add_devices(tps80031->dev, -1,
+                        tps80031_cell, ARRAY_SIZE(tps80031_cell),
+                        NULL, 0,
+                        regmap_irq_get_domain(tps80031->irq_data));
+        if (ret < 0) {
+                dev_err(&client->dev, "mfd_add_devices failed: %d\n", ret);
+                goto fail_mfd_add;
+        }
+
+        if (pdata->use_power_off && !pm_power_off) {
+                tps80031_power_off_dev = tps80031;
+                pm_power_off = tps80031_power_off;
+        }
+        return 0;
+
+fail_mfd_add:
+        regmap_del_irq_chip(client->irq, tps80031->irq_data);
+
+fail_client_reg:
+        for (i = 0; i < TPS80031_NUM_SLAVES; i++) {
+                if (tps80031->clients[i]  && (tps80031->clients[i] != client))
+                        i2c_unregister_device(tps80031->clients[i]);
+        }
+        return ret;
+}
+
+static int __devexit tps80031_remove(struct i2c_client *client)
+{
+        struct tps80031 *tps80031 = i2c_get_clientdata(client);
+        int i;
+
+        if (tps80031_power_off_dev == tps80031) {
+                tps80031_power_off_dev = NULL;
+                pm_power_off = NULL;
+        }
+
+        mfd_remove_devices(tps80031->dev);
+
+        regmap_del_irq_chip(client->irq, tps80031->irq_data);
+
+        for (i = 0; i < TPS80031_NUM_SLAVES; i++) {
+                if (tps80031->clients[i] != client)
+                        i2c_unregister_device(tps80031->clients[i]);
+        }
+        return 0;
+}
+
+static const struct i2c_device_id tps80031_id_table[] = {
+        { "tps80031", TPS80031 },
+        { "tps80032", TPS80032 },
+};
+MODULE_DEVICE_TABLE(i2c, tps80031_id_table);
+
+static struct i2c_driver tps80031_driver = {
+        .driver = {
+                .name   = "tps80031",
+                .owner  = THIS_MODULE,
+        },
+        .probe          = tps80031_probe,
+        .remove         = __devexit_p(tps80031_remove),
+        .id_table       = tps80031_id_table,
+};
+
+static int __init tps80031_init(void)
+{
+        return i2c_add_driver(&tps80031_driver);
+}
+subsys_initcall(tps80031_init);
+
+static void __exit tps80031_exit(void)
+{
+        i2c_del_driver(&tps80031_driver);
+}
+module_exit(tps80031_exit);
+
+MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
+MODULE_DESCRIPTION("TPS80031 core driver");
+MODULE_LICENSE("GPL v2");