Subject: [PATCH 043/104] mfd: twl6040: Add initial support

TWL6040 IC provides analog high-end audio codec functions for
handset applications. It contains several audio analog inputs
and outputs as well as vibrator support. It's connected to the
host processor via PDM interface for audio data communication.
The audio modules are controlled by internal registers that
can be accessed by I2C and PDM interface.

TWL6040 MFD will be registered as a child of TWL-CORE, and will
have two children of its own: twl6040-codec and twl6040-vibra.

This driver is based on TWL4030 and WM8350 MFD drivers.

Signed-off-by: Misael Lopez Cruz <misael.lopez@ti.com>
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>

8 files changed, 1088 insertions, 5 deletions

diff --git a/arch/arm/plat-omap/include/plat/irqs.h b/arch/arm/plat-omap/include/plat/irqs.h
index 5a25098ea7e..2cfba5149ea 100644
--- a/arch/arm/plat-omap/include/plat/irqs.h
+++ b/arch/arm/plat-omap/include/plat/irqs.h
@@ -407,11 +407,19 @@
 #endif
 #define TWL6030_IRQ_END         (TWL6030_IRQ_BASE + TWL6030_BASE_NR_IRQS)
 
+#define TWL6040_CODEC_IRQ_BASE  TWL6030_IRQ_END
+#ifdef CONFIG_TWL6040_CODEC
+#define TWL6040_CODEC_NR_IRQS   6
+#else
+#define TWL6040_CODEC_NR_IRQS   0
+#endif
+#define TWL6040_CODEC_IRQ_END   (TWL6040_CODEC_IRQ_BASE + TWL6040_CODEC_NR_IRQS)
+
 /* Total number of interrupts depends on the enabled blocks above */
-#if (TWL4030_GPIO_IRQ_END > TWL6030_IRQ_END)
+#if (TWL4030_GPIO_IRQ_END > TWL6040_CODEC_IRQ_END)
 #define TWL_IRQ_END             TWL4030_GPIO_IRQ_END
 #else
-#define TWL_IRQ_END             TWL6030_IRQ_END
+#define TWL_IRQ_END             TWL6040_CODEC_IRQ_END
 #endif
 
 /* GPMC related */
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 80f56fed626..37b83eb6d70 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -233,6 +233,12 @@ config TWL6030_PWM
           Say yes here if you want support for TWL6030 PWM.
           This is used to control charging LED brightness.
 
+config TWL6040_CORE
+        bool
+        depends on TWL4030_CORE && GENERIC_HARDIRQS
+        select MFD_CORE
+        default n
+
 config MFD_STMPE
         bool "Support STMicroelectronics STMPE"
         depends on I2C=y && GENERIC_HARDIRQS
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index b977e09952e..22a280fcb70 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -42,6 +42,7 @@ obj-$(CONFIG_TWL4030_MADC)      += twl4030-madc.o
 obj-$(CONFIG_TWL4030_POWER)    += twl4030-power.o
 obj-$(CONFIG_MFD_TWL4030_AUDIO) += twl4030-audio.o
 obj-$(CONFIG_TWL6030_PWM)       += twl6030-pwm.o
+obj-$(CONFIG_TWL6040_CORE)      += twl6040-core.o twl6040-irq.o
 
 obj-$(CONFIG_MFD_MC13XXX)       += mc13xxx-core.o
 
diff --git a/drivers/mfd/twl-core.c b/drivers/mfd/twl-core.c
index 0840752cd8c..a773d356971 100644
--- a/drivers/mfd/twl-core.c
+++ b/drivers/mfd/twl-core.c
@@ -110,7 +110,7 @@
 #endif
 
 #if defined(CONFIG_TWL4030_CODEC) || defined(CONFIG_TWL4030_CODEC_MODULE) ||\
-        defined(CONFIG_SND_SOC_TWL6040) || defined(CONFIG_SND_SOC_TWL6040_MODULE)
+        defined(CONFIG_TWL6040_CORE) || defined(CONFIG_TWL6040_CORE_MODULE)
 #define twl_has_codec() true
 #else
 #define twl_has_codec() false
@@ -825,10 +825,9 @@ add_children(struct twl4030_platform_data *pdata, unsigned long features)
                         return PTR_ERR(child);
         }
 
-        /* Phoenix codec driver is probed directly atm */
         if (twl_has_codec() && pdata->audio && twl_class_is_6030()) {
                 sub_chip_id = twl_map[TWL_MODULE_AUDIO_VOICE].sid;
-                child = add_child(sub_chip_id, "twl6040-codec",
+                child = add_child(sub_chip_id, "twl6040",
                                 pdata->audio, sizeof(*pdata->audio),
                                 false, 0, 0);
                 if (IS_ERR(child))
diff --git a/drivers/mfd/twl6040-core.c b/drivers/mfd/twl6040-core.c
new file mode 100644
index 00000000000..195613c7dcc
--- /dev/null
+++ b/drivers/mfd/twl6040-core.c
@@ -0,0 +1,602 @@
+/*
+ * MFD driver for TWL6040 audio device
+ *
+ * Authors:     Misael Lopez Cruz <misael.lopez@ti.com>
+ *              Jorge Eduardo Candelaria <jorge.candelaria@ti.com>
+ *              Peter Ujfalusi <peter.ujfalusi@ti.com>
+ *
+ * Copyright:   (C) 2011 Texas Instruments, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/gpio.h>
+#include <linux/delay.h>
+#include <linux/i2c/twl.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/twl6040.h>
+
+static struct platform_device *twl6040_dev;
+
+int twl6040_reg_read(struct twl6040 *twl6040, unsigned int reg)
+{
+        int ret;
+        u8 val = 0;
+
+        mutex_lock(&twl6040->io_mutex);
+        ret = twl_i2c_read_u8(TWL_MODULE_AUDIO_VOICE, &val, reg);
+        if (ret < 0) {
+                mutex_unlock(&twl6040->io_mutex);
+                return ret;
+        }
+        mutex_unlock(&twl6040->io_mutex);
+
+        return val;
+}
+EXPORT_SYMBOL(twl6040_reg_read);
+
+int twl6040_reg_write(struct twl6040 *twl6040, unsigned int reg, u8 val)
+{
+        int ret;
+
+        mutex_lock(&twl6040->io_mutex);
+        ret = twl_i2c_write_u8(TWL_MODULE_AUDIO_VOICE, val, reg);
+        mutex_unlock(&twl6040->io_mutex);
+
+        return ret;
+}
+EXPORT_SYMBOL(twl6040_reg_write);
+
+int twl6040_set_bits(struct twl6040 *twl6040, unsigned int reg, u8 mask)
+{
+        int ret;
+        u8 val;
+
+        mutex_lock(&twl6040->io_mutex);
+        ret = twl_i2c_read_u8(TWL_MODULE_AUDIO_VOICE, &val, reg);
+        if (ret)
+                goto out;
+
+        val |= mask;
+        ret = twl_i2c_write_u8(TWL_MODULE_AUDIO_VOICE, val, reg);
+out:
+        mutex_unlock(&twl6040->io_mutex);
+        return ret;
+}
+EXPORT_SYMBOL(twl6040_set_bits);
+
+int twl6040_clear_bits(struct twl6040 *twl6040, unsigned int reg, u8 mask)
+{
+        int ret;
+        u8 val;
+
+        mutex_lock(&twl6040->io_mutex);
+        ret = twl_i2c_read_u8(TWL_MODULE_AUDIO_VOICE, &val, reg);
+        if (ret)
+                goto out;
+
+        val &= ~mask;
+        ret = twl_i2c_write_u8(TWL_MODULE_AUDIO_VOICE, val, reg);
+out:
+        mutex_unlock(&twl6040->io_mutex);
+        return ret;
+}
+EXPORT_SYMBOL(twl6040_clear_bits);
+
+/* twl6040 codec manual power-up sequence */
+static int twl6040_power_up(struct twl6040 *twl6040)
+{
+        u8 ldoctl, ncpctl, lppllctl;
+        int ret;
+
+        /* enable high-side LDO, reference system and internal oscillator */
+        ldoctl = TWL6040_HSLDOENA | TWL6040_REFENA | TWL6040_OSCENA;
+        ret = twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl);
+        if (ret)
+                return ret;
+        usleep_range(10000, 10500);
+
+        /* enable negative charge pump */
+        ncpctl = TWL6040_NCPENA;
+        ret = twl6040_reg_write(twl6040, TWL6040_REG_NCPCTL, ncpctl);
+        if (ret)
+                goto ncp_err;
+        usleep_range(1000, 1500);
+
+        /* enable low-side LDO */
+        ldoctl |= TWL6040_LSLDOENA;
+        ret = twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl);
+        if (ret)
+                goto lsldo_err;
+        usleep_range(1000, 1500);
+
+        /* enable low-power PLL */
+        lppllctl = TWL6040_LPLLENA;
+        ret = twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL, lppllctl);
+        if (ret)
+                goto lppll_err;
+        usleep_range(5000, 5500);
+
+        /* disable internal oscillator */
+        ldoctl &= ~TWL6040_OSCENA;
+        ret = twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl);
+        if (ret)
+                goto osc_err;
+
+        return 0;
+
+osc_err:
+        lppllctl &= ~TWL6040_LPLLENA;
+        twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL, lppllctl);
+lppll_err:
+        ldoctl &= ~TWL6040_LSLDOENA;
+        twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl);
+lsldo_err:
+        ncpctl &= ~TWL6040_NCPENA;
+        twl6040_reg_write(twl6040, TWL6040_REG_NCPCTL, ncpctl);
+ncp_err:
+        ldoctl &= ~(TWL6040_HSLDOENA | TWL6040_REFENA | TWL6040_OSCENA);
+        twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl);
+
+        return ret;
+}
+
+/* twl6040 manual power-down sequence */
+static void twl6040_power_down(struct twl6040 *twl6040)
+{
+        u8 ncpctl, ldoctl, lppllctl;
+
+        ncpctl = twl6040_reg_read(twl6040, TWL6040_REG_NCPCTL);
+        ldoctl = twl6040_reg_read(twl6040, TWL6040_REG_LDOCTL);
+        lppllctl = twl6040_reg_read(twl6040, TWL6040_REG_LPPLLCTL);
+
+        /* enable internal oscillator */
+        ldoctl |= TWL6040_OSCENA;
+        twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl);
+        usleep_range(1000, 1500);
+
+        /* disable low-power PLL */
+        lppllctl &= ~TWL6040_LPLLENA;
+        twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL, lppllctl);
+
+        /* disable low-side LDO */
+        ldoctl &= ~TWL6040_LSLDOENA;
+        twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl);
+
+        /* disable negative charge pump */
+        ncpctl &= ~TWL6040_NCPENA;
+        twl6040_reg_write(twl6040, TWL6040_REG_NCPCTL, ncpctl);
+
+        /* disable high-side LDO, reference system and internal oscillator */
+        ldoctl &= ~(TWL6040_HSLDOENA | TWL6040_REFENA | TWL6040_OSCENA);
+        twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl);
+}
+
+static irqreturn_t twl6040_naudint_handler(int irq, void *data)
+{
+        struct twl6040 *twl6040 = data;
+        u8 intid, status;
+
+        intid = twl6040_reg_read(twl6040, TWL6040_REG_INTID);
+
+        if (intid & TWL6040_READYINT)
+                complete(&twl6040->ready);
+
+        if (intid & TWL6040_THINT) {
+                status = twl6040_reg_read(twl6040, TWL6040_REG_STATUS);
+                if (status & TWL6040_TSHUTDET) {
+                        dev_warn(&twl6040_dev->dev,
+                                 "Thermal shutdown, powering-off");
+                        twl6040_power(twl6040, 0);
+                } else {
+                        dev_warn(&twl6040_dev->dev,
+                                 "Leaving thermal shutdown, powering-on");
+                        twl6040_power(twl6040, 1);
+                }
+        }
+
+        return IRQ_HANDLED;
+}
+
+static int twl6040_power_up_completion(struct twl6040 *twl6040,
+                                       int naudint)
+{
+        int time_left;
+        u8 intid;
+
+        time_left = wait_for_completion_timeout(&twl6040->ready,
+                                                msecs_to_jiffies(144));
+        if (!time_left) {
+                intid = twl6040_reg_read(twl6040, TWL6040_REG_INTID);
+                if (!(intid & TWL6040_READYINT)) {
+                        dev_err(&twl6040_dev->dev,
+                                "timeout waiting for READYINT\n");
+                        return -ETIMEDOUT;
+                }
+        }
+
+        return 0;
+}
+
+int twl6040_power(struct twl6040 *twl6040, int on)
+{
+        int audpwron = twl6040->audpwron;
+        int naudint = twl6040->irq;
+        int ret = 0;
+
+        mutex_lock(&twl6040->mutex);
+
+        if (on) {
+                /* already powered-up */
+                if (twl6040->power_count++)
+                        goto out;
+
+                if (gpio_is_valid(audpwron)) {
+                        /* use AUDPWRON line */
+                        gpio_set_value(audpwron, 1);
+                        /* wait for power-up completion */
+                        ret = twl6040_power_up_completion(twl6040, naudint);
+                        if (ret) {
+                                dev_err(&twl6040_dev->dev,
+                                        "automatic power-down failed\n");
+                                twl6040->power_count = 0;
+                                goto out;
+                        }
+                } else {
+                        /* use manual power-up sequence */
+                        ret = twl6040_power_up(twl6040);
+                        if (ret) {
+                                dev_err(&twl6040_dev->dev,
+                                        "manual power-up failed\n");
+                                twl6040->power_count = 0;
+                                goto out;
+                        }
+                }
+                twl6040->pll = TWL6040_LPPLL_ID;
+                twl6040->sysclk = 19200000;
+        } else {
+                /* already powered-down */
+                if (!twl6040->power_count) {
+                        dev_err(&twl6040_dev->dev,
+                                "device is already powered-off\n");
+                        ret = -EPERM;
+                        goto out;
+                }
+
+                if (--twl6040->power_count)
+                        goto out;
+
+                if (gpio_is_valid(audpwron)) {
+                        /* use AUDPWRON line */
+                        gpio_set_value(audpwron, 0);
+
+                        /* power-down sequence latency */
+                        usleep_range(500, 700);
+                } else {
+                        /* use manual power-down sequence */
+                        twl6040_power_down(twl6040);
+                }
+                twl6040->pll = TWL6040_NOPLL_ID;
+                twl6040->sysclk = 0;
+        }
+
+out:
+        mutex_unlock(&twl6040->mutex);
+        return ret;
+}
+EXPORT_SYMBOL(twl6040_power);
+
+int twl6040_is_powered(struct twl6040 *twl6040)
+{
+        return twl6040->power_count;
+}
+EXPORT_SYMBOL(twl6040_is_powered);
+
+int twl6040_set_pll(struct twl6040 *twl6040, enum twl6040_pll_id id,
+                    unsigned int freq_in, unsigned int freq_out)
+{
+        u8 hppllctl, lppllctl;
+        int ret = 0;
+
+        mutex_lock(&twl6040->mutex);
+
+        hppllctl = twl6040_reg_read(twl6040, TWL6040_REG_HPPLLCTL);
+        lppllctl = twl6040_reg_read(twl6040, TWL6040_REG_LPPLLCTL);
+
+        switch (id) {
+        case TWL6040_LPPLL_ID:
+                /* low-power PLL divider */
+                switch (freq_out) {
+                case 17640000:
+                        lppllctl |= TWL6040_LPLLFIN;
+                        break;
+                case 19200000:
+                        lppllctl &= ~TWL6040_LPLLFIN;
+                        break;
+                default:
+                        dev_err(&twl6040_dev->dev,
+                                "freq_out %d not supported\n", freq_out);
+                        ret = -EINVAL;
+                        goto pll_out;
+                }
+                twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL, lppllctl);
+
+                switch (freq_in) {
+                case 32768:
+                        lppllctl |= TWL6040_LPLLENA;
+                        twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL,
+                                          lppllctl);
+                        mdelay(5);
+                        lppllctl &= ~TWL6040_HPLLSEL;
+                        twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL,
+                                          lppllctl);
+                        hppllctl &= ~TWL6040_HPLLENA;
+                        twl6040_reg_write(twl6040, TWL6040_REG_HPPLLCTL,
+                                          hppllctl);
+                        break;
+                default:
+                        dev_err(&twl6040_dev->dev,
+                                "freq_in %d not supported\n", freq_in);
+                        ret = -EINVAL;
+                        goto pll_out;
+                }
+
+                twl6040->pll = TWL6040_LPPLL_ID;
+                break;
+        case TWL6040_HPPLL_ID:
+                /* high-performance PLL can provide only 19.2 MHz */
+                if (freq_out != 19200000) {
+                        dev_err(&twl6040_dev->dev,
+                                "freq_out %d not supported\n", freq_out);
+                        ret = -EINVAL;
+                        goto pll_out;
+                }
+
+                hppllctl &= ~TWL6040_MCLK_MSK;
+
+                switch (freq_in) {
+                case 12000000:
+                        /* PLL enabled, active mode */
+                        hppllctl |= TWL6040_MCLK_12000KHZ |
+                                    TWL6040_HPLLENA;
+                        break;
+                case 19200000:
+                        /*
+                         * PLL disabled
+                         * (enable PLL if MCLK jitter quality
+                         *  doesn't meet specification)
+                         */
+                        hppllctl |= TWL6040_MCLK_19200KHZ;
+                        break;
+                case 26000000:
+                        /* PLL enabled, active mode */
+                        hppllctl |= TWL6040_MCLK_26000KHZ |
+                                    TWL6040_HPLLENA;
+                        break;
+                case 38400000:
+                        /* PLL enabled, active mode */
+                        hppllctl |= TWL6040_MCLK_38400KHZ |
+                                    TWL6040_HPLLENA;
+                        break;
+                default:
+                        dev_err(&twl6040_dev->dev,
+                                "freq_in %d not supported\n", freq_in);
+                        ret = -EINVAL;
+                        goto pll_out;
+                }
+
+                /* enable clock slicer to ensure input waveform is square */
+                hppllctl |= TWL6040_HPLLSQRENA;
+
+                twl6040_reg_write(twl6040, TWL6040_REG_HPPLLCTL, hppllctl);
+                usleep_range(500, 700);
+                lppllctl |= TWL6040_HPLLSEL;
+                twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL, lppllctl);
+                lppllctl &= ~TWL6040_LPLLENA;
+                twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL, lppllctl);
+
+                twl6040->pll = TWL6040_HPPLL_ID;
+                break;
+        default:
+                dev_err(&twl6040_dev->dev, "unknown pll id %d\n", id);
+                ret = -EINVAL;
+                goto pll_out;
+        }
+
+        twl6040->sysclk = freq_out;
+
+pll_out:
+        mutex_unlock(&twl6040->mutex);
+        return ret;
+}
+EXPORT_SYMBOL(twl6040_set_pll);
+
+enum twl6040_pll_id twl6040_get_pll(struct twl6040 *twl6040)
+{
+        return twl6040->pll;
+}
+EXPORT_SYMBOL(twl6040_get_pll);
+
+unsigned int twl6040_get_sysclk(struct twl6040 *twl6040)
+{
+        return twl6040->sysclk;
+}
+EXPORT_SYMBOL(twl6040_get_sysclk);
+
+static int __devinit twl6040_probe(struct platform_device *pdev)
+{
+        struct twl4030_audio_data *pdata = pdev->dev.platform_data;
+        struct twl6040 *twl6040;
+        struct mfd_cell *cell = NULL;
+        int ret, children = 0;
+
+        if (!pdata) {
+                dev_err(&pdev->dev, "Platform data is missing\n");
+                return -EINVAL;
+        }
+
+        twl6040 = kzalloc(sizeof(struct twl6040), GFP_KERNEL);
+        if (!twl6040)
+                return -ENOMEM;
+
+        platform_set_drvdata(pdev, twl6040);
+
+        twl6040_dev = pdev;
+        twl6040->dev = &pdev->dev;
+        twl6040->audpwron = pdata->audpwron_gpio;
+        twl6040->irq = pdata->naudint_irq;
+        twl6040->irq_base = pdata->irq_base;
+
+        mutex_init(&twl6040->mutex);
+        mutex_init(&twl6040->io_mutex);
+        init_completion(&twl6040->ready);
+
+        twl6040->rev = twl6040_reg_read(twl6040, TWL6040_REG_ASICREV);
+
+        if (gpio_is_valid(twl6040->audpwron)) {
+                ret = gpio_request(twl6040->audpwron, "audpwron");
+                if (ret)
+                        goto gpio1_err;
+
+                ret = gpio_direction_output(twl6040->audpwron, 0);
+                if (ret)
+                        goto gpio2_err;
+        }
+
+        /* ERRATA: Automatic power-up is not possible in ES1.0 */
+        if (twl6040_get_rev(twl6040) == TWL6040_REV_ES1_0)
+                twl6040->audpwron = -EINVAL;
+
+        if (twl6040->irq) {
+                /* codec interrupt */
+                ret = twl6040_irq_init(twl6040);
+                if (ret)
+                        goto gpio2_err;
+
+                ret = twl6040_request_irq(twl6040, TWL6040_IRQ_READY,
+                                          twl6040_naudint_handler, 0,
+                                          "twl6040_irq_ready", twl6040);
+                if (ret) {
+                        dev_err(twl6040->dev, "READY IRQ request failed: %d\n",
+                                ret);
+                        goto irq_err;
+                }
+        }
+
+        /* dual-access registers controlled by I2C only */
+        twl6040_set_bits(twl6040, TWL6040_REG_ACCCTL, TWL6040_I2CSEL);
+
+        if (pdata->codec) {
+                cell = &twl6040->cells[children];
+                cell->name = "twl6040-codec";
+                /* The codec expects the twl4030_audio_data as platform data */
+                cell->platform_data = pdata;
+                cell->pdata_size = sizeof(*pdata);
+                children++;
+        }
+
+        if (pdata->vibra) {
+                cell = &twl6040->cells[children];
+                cell->name = "twl6040-vibra";
+                cell->platform_data = pdata->vibra;
+                cell->pdata_size = sizeof(*pdata->vibra);
+                children++;
+        }
+
+        if (children) {
+                ret = mfd_add_devices(&pdev->dev, pdev->id, twl6040->cells,
+                                      children, NULL, 0);
+                if (ret)
+                        goto mfd_err;
+        } else {
+                dev_err(&pdev->dev, "No platform data found for children\n");
+                ret = -ENODEV;
+                goto mfd_err;
+        }
+
+        return 0;
+
+mfd_err:
+        if (twl6040->irq)
+                twl6040_free_irq(twl6040, TWL6040_IRQ_READY, twl6040);
+irq_err:
+        if (twl6040->irq)
+                twl6040_irq_exit(twl6040);
+gpio2_err:
+        if (gpio_is_valid(twl6040->audpwron))
+                gpio_free(twl6040->audpwron);
+gpio1_err:
+        platform_set_drvdata(pdev, NULL);
+        kfree(twl6040);
+        twl6040_dev = NULL;
+        return ret;
+}
+
+static int __devexit twl6040_remove(struct platform_device *pdev)
+{
+        struct twl6040 *twl6040 = platform_get_drvdata(pdev);
+
+        if (twl6040_is_powered(twl6040))
+                twl6040_power(twl6040, 0);
+
+        if (gpio_is_valid(twl6040->audpwron))
+                gpio_free(twl6040->audpwron);
+
+        twl6040_free_irq(twl6040, TWL6040_IRQ_READY, twl6040);
+
+        if (twl6040->irq)
+                twl6040_irq_exit(twl6040);
+
+        mfd_remove_devices(&pdev->dev);
+        platform_set_drvdata(pdev, NULL);
+        kfree(twl6040);
+        twl6040_dev = NULL;
+
+        return 0;
+}
+
+static struct platform_driver twl6040_driver = {
+        .probe          = twl6040_probe,
+        .remove         = __devexit_p(twl6040_remove),
+        .driver         = {
+                .owner  = THIS_MODULE,
+                .name   = "twl6040",
+        },
+};
+
+static int __devinit twl6040_init(void)
+{
+        return platform_driver_register(&twl6040_driver);
+}
+module_init(twl6040_init);
+
+static void __devexit twl6040_exit(void)
+{
+        platform_driver_unregister(&twl6040_driver);
+}
+
+module_exit(twl6040_exit);
+
+MODULE_DESCRIPTION("TWL6040 MFD");
+MODULE_AUTHOR("Misael Lopez Cruz <misael.lopez@ti.com>");
+MODULE_AUTHOR("Jorge Eduardo Candelaria <jorge.candelaria@ti.com>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:twl6040");
diff --git a/drivers/mfd/twl6040-irq.c b/drivers/mfd/twl6040-irq.c
new file mode 100644
index 00000000000..93805354152
--- /dev/null
+++ b/drivers/mfd/twl6040-irq.c
@@ -0,0 +1,205 @@
+/*
+ * Interrupt controller support for TWL6040
+ *
+ * Author:     Misael Lopez Cruz <misael.lopez@ti.com>
+ *
+ * Copyright:   (C) 2011 Texas Instruments, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/irq.h>
+#include <linux/interrupt.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/twl6040.h>
+
+struct twl6040_irq_data {
+        int mask;
+        int status;
+};
+
+static struct twl6040_irq_data twl6040_irqs[] = {
+        {
+                .mask = TWL6040_THMSK,
+                .status = TWL6040_THINT,
+        },
+        {
+                .mask = TWL6040_PLUGMSK,
+                .status = TWL6040_PLUGINT | TWL6040_UNPLUGINT,
+        },
+        {
+                .mask = TWL6040_HOOKMSK,
+                .status = TWL6040_HOOKINT,
+        },
+        {
+                .mask = TWL6040_HFMSK,
+                .status = TWL6040_HFINT,
+        },
+        {
+                .mask = TWL6040_VIBMSK,
+                .status = TWL6040_VIBINT,
+        },
+        {
+                .mask = TWL6040_READYMSK,
+                .status = TWL6040_READYINT,
+        },
+};
+
+static inline
+struct twl6040_irq_data *irq_to_twl6040_irq(struct twl6040 *twl6040,
+                                            int irq)
+{
+        return &twl6040_irqs[irq - twl6040->irq_base];
+}
+
+static void twl6040_irq_lock(struct irq_data *data)
+{
+        struct twl6040 *twl6040 = irq_data_get_irq_chip_data(data);
+
+        mutex_lock(&twl6040->irq_mutex);
+}
+
+static void twl6040_irq_sync_unlock(struct irq_data *data)
+{
+        struct twl6040 *twl6040 = irq_data_get_irq_chip_data(data);
+
+        /* write back to hardware any change in irq mask */
+        if (twl6040->irq_masks_cur != twl6040->irq_masks_cache) {
+                twl6040->irq_masks_cache = twl6040->irq_masks_cur;
+                twl6040_reg_write(twl6040, TWL6040_REG_INTMR,
+                                  twl6040->irq_masks_cur);
+        }
+
+        mutex_unlock(&twl6040->irq_mutex);
+}
+
+static void twl6040_irq_enable(struct irq_data *data)
+{
+        struct twl6040 *twl6040 = irq_data_get_irq_chip_data(data);
+        struct twl6040_irq_data *irq_data = irq_to_twl6040_irq(twl6040,
+                                                               data->irq);
+
+        twl6040->irq_masks_cur &= ~irq_data->mask;
+}
+
+static void twl6040_irq_disable(struct irq_data *data)
+{
+        struct twl6040 *twl6040 = irq_data_get_irq_chip_data(data);
+        struct twl6040_irq_data *irq_data = irq_to_twl6040_irq(twl6040,
+                                                               data->irq);
+
+        twl6040->irq_masks_cur |= irq_data->mask;
+}
+
+static struct irq_chip twl6040_irq_chip = {
+        .name                   = "twl6040",
+        .irq_bus_lock           = twl6040_irq_lock,
+        .irq_bus_sync_unlock    = twl6040_irq_sync_unlock,
+        .irq_enable             = twl6040_irq_enable,
+        .irq_disable            = twl6040_irq_disable,
+};
+
+static irqreturn_t twl6040_irq_thread(int irq, void *data)
+{
+        struct twl6040 *twl6040 = data;
+        u8 intid;
+        int i;
+
+        intid = twl6040_reg_read(twl6040, TWL6040_REG_INTID);
+
+        /* apply masking and report (backwards to handle READYINT first) */
+        for (i = ARRAY_SIZE(twl6040_irqs) - 1; i >= 0; i--) {
+                if (twl6040->irq_masks_cur & twl6040_irqs[i].mask)
+                        intid &= ~twl6040_irqs[i].status;
+                if (intid & twl6040_irqs[i].status)
+                        handle_nested_irq(twl6040->irq_base + i);
+        }
+
+        /* ack unmasked irqs */
+        twl6040_reg_write(twl6040, TWL6040_REG_INTID, intid);
+
+        return IRQ_HANDLED;
+}
+
+int twl6040_irq_init(struct twl6040 *twl6040)
+{
+        int cur_irq, ret;
+        u8 val;
+
+        mutex_init(&twl6040->irq_mutex);
+
+        /* mask the individual interrupt sources */
+        twl6040->irq_masks_cur = TWL6040_ALLINT_MSK;
+        twl6040->irq_masks_cache = TWL6040_ALLINT_MSK;
+        twl6040_reg_write(twl6040, TWL6040_REG_INTMR, TWL6040_ALLINT_MSK);
+
+        if (!twl6040->irq) {
+                dev_warn(twl6040->dev,
+                         "no interrupt specified, no interrupts\n");
+                twl6040->irq_base = 0;
+                return 0;
+        }
+
+        if (!twl6040->irq_base) {
+                dev_err(twl6040->dev,
+                        "no interrupt base specified, no interrupts\n");
+                return 0;
+        }
+
+        /* Register them with genirq */
+        for (cur_irq = twl6040->irq_base;
+             cur_irq < twl6040->irq_base + ARRAY_SIZE(twl6040_irqs);
+             cur_irq++) {
+                irq_set_chip_data(cur_irq, twl6040);
+                irq_set_chip_and_handler(cur_irq, &twl6040_irq_chip,
+                                         handle_level_irq);
+                irq_set_nested_thread(cur_irq, 1);
+
+                /* ARM needs us to explicitly flag the IRQ as valid
+                 * and will set them noprobe when we do so. */
+#ifdef CONFIG_ARM
+                set_irq_flags(cur_irq, IRQF_VALID);
+#else
+                irq_set_noprobe(cur_irq);
+#endif
+        }
+
+        ret = request_threaded_irq(twl6040->irq, NULL, twl6040_irq_thread,
+                                   IRQF_ONESHOT, "twl6040", twl6040);
+        if (ret) {
+                dev_err(twl6040->dev, "failed to request IRQ %d: %d\n",
+                        twl6040->irq, ret);
+                return ret;
+        }
+
+        /* reset interrupts */
+        val = twl6040_reg_read(twl6040, TWL6040_REG_INTID);
+
+        /* interrupts cleared on write */
+        twl6040_clear_bits(twl6040, TWL6040_REG_ACCCTL, TWL6040_INTCLRMODE);
+
+        return 0;
+}
+EXPORT_SYMBOL(twl6040_irq_init);
+
+void twl6040_irq_exit(struct twl6040 *twl6040)
+{
+        if (twl6040->irq)
+                free_irq(twl6040->irq, twl6040);
+}
+EXPORT_SYMBOL(twl6040_irq_exit);
diff --git a/include/linux/i2c/twl.h b/include/linux/i2c/twl.h
index e0aba2b92fa..ea5baa26922 100644
--- a/include/linux/i2c/twl.h
+++ b/include/linux/i2c/twl.h
@@ -679,6 +679,7 @@ struct twl4030_audio_data {
         /* twl6040 */
         int audpwron_gpio;      /* audio power-on gpio */
         int naudint_irq;        /* audio interrupt */
+        unsigned int irq_base;
 };
 
 struct twl4030_platform_data {
diff --git a/include/linux/mfd/twl6040.h b/include/linux/mfd/twl6040.h
new file mode 100644
index 00000000000..d384a014b76
--- /dev/null
+++ b/include/linux/mfd/twl6040.h
@@ -0,0 +1,261 @@
+/*
+ * MFD driver for twl6040
+ *
+ * Authors:     Jorge Eduardo Candelaria <jorge.candelaria@ti.com>
+ *              Misael Lopez Cruz <misael.lopez@ti.com>
+ *
+ * Copyright:   (C) 2011 Texas Instruments, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ *
+ */
+
+#ifndef __TWL6040_CODEC_H__
+#define __TWL6040_CODEC_H__
+
+#include <linux/interrupt.h>
+#include <linux/mfd/core.h>
+
+#define TWL6040_REG_ASICID              0x01
+#define TWL6040_REG_ASICREV             0x02
+#define TWL6040_REG_INTID               0x03
+#define TWL6040_REG_INTMR               0x04
+#define TWL6040_REG_NCPCTL              0x05
+#define TWL6040_REG_LDOCTL              0x06
+#define TWL6040_REG_HPPLLCTL            0x07
+#define TWL6040_REG_LPPLLCTL            0x08
+#define TWL6040_REG_LPPLLDIV            0x09
+#define TWL6040_REG_AMICBCTL            0x0A
+#define TWL6040_REG_DMICBCTL            0x0B
+#define TWL6040_REG_MICLCTL             0x0C
+#define TWL6040_REG_MICRCTL             0x0D
+#define TWL6040_REG_MICGAIN             0x0E
+#define TWL6040_REG_LINEGAIN            0x0F
+#define TWL6040_REG_HSLCTL              0x10
+#define TWL6040_REG_HSRCTL              0x11
+#define TWL6040_REG_HSGAIN              0x12
+#define TWL6040_REG_EARCTL              0x13
+#define TWL6040_REG_HFLCTL              0x14
+#define TWL6040_REG_HFLGAIN             0x15
+#define TWL6040_REG_HFRCTL              0x16
+#define TWL6040_REG_HFRGAIN             0x17
+#define TWL6040_REG_VIBCTLL             0x18
+#define TWL6040_REG_VIBDATL             0x19
+#define TWL6040_REG_VIBCTLR             0x1A
+#define TWL6040_REG_VIBDATR             0x1B
+#define TWL6040_REG_HKCTL1              0x1C
+#define TWL6040_REG_HKCTL2              0x1D
+#define TWL6040_REG_GPOCTL              0x1E
+#define TWL6040_REG_ALB                 0x1F
+#define TWL6040_REG_DLB                 0x20
+#define TWL6040_REG_TRIM1               0x28
+#define TWL6040_REG_TRIM2               0x29
+#define TWL6040_REG_TRIM3               0x2A
+#define TWL6040_REG_HSOTRIM             0x2B
+#define TWL6040_REG_HFOTRIM             0x2C
+#define TWL6040_REG_ACCCTL              0x2D
+#define TWL6040_REG_STATUS              0x2E
+
+#define TWL6040_CACHEREGNUM             (TWL6040_REG_STATUS + 1)
+
+#define TWL6040_VIOREGNUM               18
+#define TWL6040_VDDREGNUM               21
+
+/* INTID (0x03) fields */
+
+#define TWL6040_THINT                   0x01
+#define TWL6040_PLUGINT                 0x02
+#define TWL6040_UNPLUGINT               0x04
+#define TWL6040_HOOKINT                 0x08
+#define TWL6040_HFINT                   0x10
+#define TWL6040_VIBINT                  0x20
+#define TWL6040_READYINT                0x40
+
+/* INTMR (0x04) fields */
+
+#define TWL6040_THMSK                   0x01
+#define TWL6040_PLUGMSK                 0x02
+#define TWL6040_HOOKMSK                 0x08
+#define TWL6040_HFMSK                   0x10
+#define TWL6040_VIBMSK                  0x20
+#define TWL6040_READYMSK                0x40
+#define TWL6040_ALLINT_MSK              0x7B
+
+/* NCPCTL (0x05) fields */
+
+#define TWL6040_NCPENA                  0x01
+#define TWL6040_NCPOPEN                 0x40
+
+/* LDOCTL (0x06) fields */
+
+#define TWL6040_LSLDOENA                0x01
+#define TWL6040_HSLDOENA                0x04
+#define TWL6040_REFENA                  0x40
+#define TWL6040_OSCENA                  0x80
+
+/* HPPLLCTL (0x07) fields */
+
+#define TWL6040_HPLLENA                 0x01
+#define TWL6040_HPLLRST                 0x02
+#define TWL6040_HPLLBP                  0x04
+#define TWL6040_HPLLSQRENA              0x08
+#define TWL6040_MCLK_12000KHZ           (0 << 5)
+#define TWL6040_MCLK_19200KHZ           (1 << 5)
+#define TWL6040_MCLK_26000KHZ           (2 << 5)
+#define TWL6040_MCLK_38400KHZ           (3 << 5)
+#define TWL6040_MCLK_MSK                0x60
+
+/* LPPLLCTL (0x08) fields */
+
+#define TWL6040_LPLLENA                 0x01
+#define TWL6040_LPLLRST                 0x02
+#define TWL6040_LPLLSEL                 0x04
+#define TWL6040_LPLLFIN                 0x08
+#define TWL6040_HPLLSEL                 0x10
+
+/* HSLCTL (0x10) fields */
+
+#define TWL6040_HSDACMODEL              0x02
+#define TWL6040_HSDRVMODEL              0x08
+
+/* HSRCTL (0x11) fields */
+
+#define TWL6040_HSDACMODER              0x02
+#define TWL6040_HSDRVMODER              0x08
+
+/* VIBCTLL (0x18) fields */
+
+#define TWL6040_VIBENAL                 0x01
+#define TWL6040_VIBCTRLL                0x04
+#define TWL6040_VIBCTRLLP               0x08
+#define TWL6040_VIBCTRLLN               0x10
+
+/* VIBDATL (0x19) fields */
+
+#define TWL6040_VIBDAT_MAX              0x64
+
+/* VIBCTLR (0x1A) fields */
+
+#define TWL6040_VIBENAR                 0x01
+#define TWL6040_VIBCTRLR                0x04
+#define TWL6040_VIBCTRLRP               0x08
+#define TWL6040_VIBCTRLRN               0x10
+
+/* GPOCTL (0x1E) fields */
+
+#define TWL6040_GPO1                    0x01
+#define TWL6040_GPO2                    0x02
+#define TWL6040_GPO3                    0x03
+
+/* ACCCTL (0x2D) fields */
+
+#define TWL6040_I2CSEL                  0x01
+#define TWL6040_RESETSPLIT              0x04
+#define TWL6040_INTCLRMODE              0x08
+
+#define TWL6040_SYSCLK_SEL_LPPLL        1
+#define TWL6040_SYSCLK_SEL_HPPLL        2
+
+/* STATUS (0x2E) fields */
+
+#define TWL6040_PLUGCOMP                0x02
+#define TWL6040_VIBLOCDET               0x10
+#define TWL6040_VIBROCDET               0x20
+#define TWL6040_TSHUTDET                0x40
+
+#define TWL6040_CELLS                   2
+
+#define TWL6040_REV_ES1_0               0x00
+#define TWL6040_REV_ES1_1               0x01
+#define TWL6040_REV_ES1_2               0x02
+
+#define TWL6040_IRQ_TH                  0
+#define TWL6040_IRQ_PLUG                1
+#define TWL6040_IRQ_HOOK                2
+#define TWL6040_IRQ_HF                  3
+#define TWL6040_IRQ_VIB                 4
+#define TWL6040_IRQ_READY               5
+
+enum twl6040_pll_id {
+        TWL6040_NOPLL_ID,
+        TWL6040_LPPLL_ID,
+        TWL6040_HPPLL_ID,
+};
+
+struct twl6040 {
+        struct device *dev;
+        struct mutex mutex;
+        struct mutex io_mutex;
+        struct mutex irq_mutex;
+        struct mfd_cell cells[TWL6040_CELLS];
+        struct completion ready;
+
+        int audpwron;
+        int power_count;
+        int rev;
+
+        enum twl6040_pll_id pll;
+        unsigned int sysclk;
+
+        unsigned int irq;
+        unsigned int irq_base;
+        u8 irq_masks_cur;
+        u8 irq_masks_cache;
+};
+
+static inline int twl6040_get_rev(struct twl6040 *twl6040)
+{
+        return twl6040->rev;
+}
+
+static inline int twl6040_request_irq(struct twl6040 *twl6040, int irq,
+                                      irq_handler_t handler,
+                                      unsigned long irqflags,
+                                      const char *name,
+                                      void *data)
+{
+        if (!twl6040->irq_base)
+                return -EINVAL;
+
+        return request_threaded_irq(twl6040->irq_base + irq, NULL, handler,
+                                    irqflags, name, data);
+}
+
+static inline void twl6040_free_irq(struct twl6040 *twl6040, int irq,
+                                    void *data)
+{
+        if (!twl6040->irq_base)
+                return;
+
+        free_irq(twl6040->irq_base + irq, data);
+}
+
+int twl6040_reg_read(struct twl6040 *twl6040, unsigned int reg);
+int twl6040_reg_write(struct twl6040 *twl6040, unsigned int reg,
+                      u8 val);
+int twl6040_set_bits(struct twl6040 *twl6040, unsigned int reg,
+                     u8 mask);
+int twl6040_clear_bits(struct twl6040 *twl6040, unsigned int reg,
+                       u8 mask);
+int twl6040_power(struct twl6040 *twl6040, int on);
+int twl6040_is_powered(struct twl6040 *twl6040);
+int twl6040_set_pll(struct twl6040 *twl6040, enum twl6040_pll_id id,
+                    unsigned int freq_in, unsigned int freq_out);
+enum twl6040_pll_id twl6040_get_pll(struct twl6040 *twl6040);
+unsigned int twl6040_get_sysclk(struct twl6040 *twl6040);
+int twl6040_irq_init(struct twl6040 *twl6040);
+void twl6040_irq_exit(struct twl6040 *twl6040);
+
+#endif  /* End of __TWL6040_CODEC_H__ */