mfd: Add Freescale MC13783 driver

This driver provides the core Freescale MC13783 support. It
registers the client platform_devices and provides access
to the A/D converter.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

3 files changed, 439 insertions, 0 deletions

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 0273456af77f..a4f3dff30ba5 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -238,6 +238,16 @@ config MFD_PCF50633
           facilities, and registers devices for the various functions
           so that function-specific drivers can bind to them.
 
+config MFD_MC13783
+        tristate "Support Freescale MC13783"
+        depends on SPI_MASTER
+        select MFD_CORE
+        help
+          Support for the Freescale (Atlas) MC13783 PMIC and audio CODEC.
+          This driver provides common support for accessing  the device,
+          additional drivers must be enabled in order to use the
+          functionality of the device.
+
 config PCF50633_ADC
         tristate "Support for NXP PCF50633 ADC"
         depends on MFD_PCF50633
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 285cb320e6a6..7fec04fb5f47 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -26,6 +26,8 @@ obj-$(CONFIG_MENELAUS)		+= menelaus.o
 
 obj-$(CONFIG_TWL4030_CORE)      += twl4030-core.o twl4030-irq.o
 
+obj-$(CONFIG_MFD_MC13783)       += mc13783-core.o
+
 obj-$(CONFIG_MFD_CORE)          += mfd-core.o
 
 obj-$(CONFIG_EZX_PCAP)          += ezx-pcap.o
diff --git a/drivers/mfd/mc13783-core.c b/drivers/mfd/mc13783-core.c
new file mode 100644
index 000000000000..e354d2912ef1
--- /dev/null
+++ b/drivers/mfd/mc13783-core.c
@@ -0,0 +1,427 @@
+/*
+ * Copyright 2009 Pengutronix, Sascha Hauer <s.hauer@pengutronix.de>
+ *
+ * This code is in parts based on wm8350-core.c and pcf50633-core.c
+ *
+ * Initial development of this code was funded by
+ * Phytec Messtechnik GmbH, http://www.phytec.de
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/mfd/mc13783-private.h>
+#include <linux/platform_device.h>
+#include <linux/mfd/mc13783.h>
+#include <linux/completion.h>
+#include <linux/interrupt.h>
+#include <linux/mfd/core.h>
+#include <linux/spi/spi.h>
+#include <linux/uaccess.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/irq.h>
+
+#define MC13783_MAX_REG_NUM     0x3f
+#define MC13783_FRAME_MASK      0x00ffffff
+#define MC13783_MAX_REG_NUM     0x3f
+#define MC13783_REG_NUM_SHIFT   0x19
+#define MC13783_WRITE_BIT_SHIFT 31
+
+static inline int spi_rw(struct spi_device *spi, u8 * buf, size_t len)
+{
+        struct spi_transfer t = {
+                .tx_buf = (const void *)buf,
+                .rx_buf = buf,
+                .len = len,
+                .cs_change = 0,
+                .delay_usecs = 0,
+        };
+        struct spi_message m;
+
+        spi_message_init(&m);
+        spi_message_add_tail(&t, &m);
+        if (spi_sync(spi, &m) != 0 || m.status != 0)
+                return -EINVAL;
+        return len - m.actual_length;
+}
+
+static int mc13783_read(struct mc13783 *mc13783, int reg_num, u32 *reg_val)
+{
+        unsigned int frame = 0;
+        int ret = 0;
+
+        if (reg_num > MC13783_MAX_REG_NUM)
+                return -EINVAL;
+
+        frame |= reg_num << MC13783_REG_NUM_SHIFT;
+
+        ret = spi_rw(mc13783->spi_device, (u8 *)&frame, 4);
+
+        *reg_val = frame & MC13783_FRAME_MASK;
+
+        return ret;
+}
+
+static int mc13783_write(struct mc13783 *mc13783, int reg_num, u32 reg_val)
+{
+        unsigned int frame = 0;
+
+        if (reg_num > MC13783_MAX_REG_NUM)
+                return -EINVAL;
+
+        frame |= (1 << MC13783_WRITE_BIT_SHIFT);
+        frame |= reg_num << MC13783_REG_NUM_SHIFT;
+        frame |= reg_val & MC13783_FRAME_MASK;
+
+        return spi_rw(mc13783->spi_device, (u8 *)&frame, 4);
+}
+
+int mc13783_reg_read(struct mc13783 *mc13783, int reg_num, u32 *reg_val)
+{
+        int ret;
+
+        mutex_lock(&mc13783->io_lock);
+        ret = mc13783_read(mc13783, reg_num, reg_val);
+        mutex_unlock(&mc13783->io_lock);
+
+        return ret;
+}
+EXPORT_SYMBOL_GPL(mc13783_reg_read);
+
+int mc13783_reg_write(struct mc13783 *mc13783, int reg_num, u32 reg_val)
+{
+        int ret;
+
+        mutex_lock(&mc13783->io_lock);
+        ret = mc13783_write(mc13783, reg_num, reg_val);
+        mutex_unlock(&mc13783->io_lock);
+
+        return ret;
+}
+EXPORT_SYMBOL_GPL(mc13783_reg_write);
+
+/**
+ * mc13783_set_bits - Bitmask write
+ *
+ * @mc13783: Pointer to mc13783 control structure
+ * @reg:    Register to access
+ * @mask:   Mask of bits to change
+ * @val:    Value to set for masked bits
+ */
+int mc13783_set_bits(struct mc13783 *mc13783, int reg, u32 mask, u32 val)
+{
+        u32 tmp;
+        int ret;
+
+        mutex_lock(&mc13783->io_lock);
+
+        ret = mc13783_read(mc13783, reg, &tmp);
+        tmp = (tmp & ~mask) | val;
+        if (ret == 0)
+                ret = mc13783_write(mc13783, reg, tmp);
+
+        mutex_unlock(&mc13783->io_lock);
+
+        return ret;
+}
+EXPORT_SYMBOL_GPL(mc13783_set_bits);
+
+int mc13783_register_irq(struct mc13783 *mc13783, int irq,
+                void (*handler) (int, void *), void *data)
+{
+        if (irq < 0 || irq > MC13783_NUM_IRQ || !handler)
+                return -EINVAL;
+
+        if (WARN_ON(mc13783->irq_handler[irq].handler))
+                return -EBUSY;
+
+        mutex_lock(&mc13783->io_lock);
+        mc13783->irq_handler[irq].handler = handler;
+        mc13783->irq_handler[irq].data = data;
+        mutex_unlock(&mc13783->io_lock);
+
+        return 0;
+}
+EXPORT_SYMBOL_GPL(mc13783_register_irq);
+
+int mc13783_free_irq(struct mc13783 *mc13783, int irq)
+{
+        if (irq < 0 || irq > MC13783_NUM_IRQ)
+                return -EINVAL;
+
+        mutex_lock(&mc13783->io_lock);
+        mc13783->irq_handler[irq].handler = NULL;
+        mutex_unlock(&mc13783->io_lock);
+
+        return 0;
+}
+EXPORT_SYMBOL_GPL(mc13783_free_irq);
+
+static void mc13783_irq_work(struct work_struct *work)
+{
+        struct mc13783 *mc13783 = container_of(work, struct mc13783, work);
+        int i;
+        unsigned int adc_sts;
+
+        /* check if the adc has finished any completion */
+        mc13783_reg_read(mc13783, MC13783_REG_INTERRUPT_STATUS_0, &adc_sts);
+        mc13783_reg_write(mc13783, MC13783_REG_INTERRUPT_STATUS_0,
+                        adc_sts & MC13783_INT_STAT_ADCDONEI);
+
+        if (adc_sts & MC13783_INT_STAT_ADCDONEI)
+                complete_all(&mc13783->adc_done);
+
+        for (i = 0; i < MC13783_NUM_IRQ; i++)
+                if (mc13783->irq_handler[i].handler)
+                        mc13783->irq_handler[i].handler(i,
+                                        mc13783->irq_handler[i].data);
+        enable_irq(mc13783->irq);
+}
+
+static irqreturn_t mc13783_interrupt(int irq, void *dev_id)
+{
+        struct mc13783 *mc13783 = dev_id;
+
+        disable_irq_nosync(irq);
+
+        schedule_work(&mc13783->work);
+        return IRQ_HANDLED;
+}
+
+/* set adc to ts interrupt mode, which generates touchscreen wakeup interrupt */
+static inline void mc13783_adc_set_ts_irq_mode(struct mc13783 *mc13783)
+{
+        unsigned int reg_adc0, reg_adc1;
+
+        reg_adc0 = MC13783_ADC0_ADREFEN | MC13783_ADC0_ADREFMODE
+                        | MC13783_ADC0_TSMOD0;
+        reg_adc1 = MC13783_ADC1_ADEN | MC13783_ADC1_ADTRIGIGN;
+
+        mc13783_reg_write(mc13783, MC13783_REG_ADC_0, reg_adc0);
+        mc13783_reg_write(mc13783, MC13783_REG_ADC_1, reg_adc1);
+}
+
+int mc13783_adc_do_conversion(struct mc13783 *mc13783, unsigned int mode,
+                unsigned int channel, unsigned int *sample)
+{
+        unsigned int reg_adc0, reg_adc1;
+        int i;
+
+        mutex_lock(&mc13783->adc_conv_lock);
+
+        /* set up auto incrementing anyway to make quick read */
+        reg_adc0 =  MC13783_ADC0_ADINC1 | MC13783_ADC0_ADINC2;
+        /* enable the adc, ignore external triggering and set ASC to trigger
+         * conversion */
+        reg_adc1 =  MC13783_ADC1_ADEN | MC13783_ADC1_ADTRIGIGN
+                | MC13783_ADC1_ASC;
+
+        /* setup channel number */
+        if (channel > 7)
+                reg_adc1 |= MC13783_ADC1_ADSEL;
+
+        switch (mode) {
+        case MC13783_ADC_MODE_TS:
+                /* enables touch screen reference mode and set touchscreen mode
+                 * to position mode */
+                reg_adc0 |= MC13783_ADC0_ADREFEN | MC13783_ADC0_ADREFMODE
+                        | MC13783_ADC0_TSMOD0 | MC13783_ADC0_TSMOD1;
+                reg_adc1 |= 4 << MC13783_ADC1_CHAN1_SHIFT;
+                break;
+        case MC13783_ADC_MODE_SINGLE_CHAN:
+                reg_adc1 |= (channel & 0x7) << MC13783_ADC1_CHAN0_SHIFT;
+                reg_adc1 |= MC13783_ADC1_RAND;
+                break;
+        case MC13783_ADC_MODE_MULT_CHAN:
+                reg_adc1 |= 4 << MC13783_ADC1_CHAN1_SHIFT;
+                break;
+        default:
+                return -EINVAL;
+        }
+
+        mc13783_reg_write(mc13783, MC13783_REG_ADC_0, reg_adc0);
+        mc13783_reg_write(mc13783, MC13783_REG_ADC_1, reg_adc1);
+
+        wait_for_completion_interruptible(&mc13783->adc_done);
+
+        for (i = 0; i < 4; i++)
+                mc13783_reg_read(mc13783, MC13783_REG_ADC_2, &sample[i]);
+
+        if (mc13783->ts_active)
+                mc13783_adc_set_ts_irq_mode(mc13783);
+
+        mutex_unlock(&mc13783->adc_conv_lock);
+
+        return 0;
+}
+EXPORT_SYMBOL_GPL(mc13783_adc_do_conversion);
+
+void mc13783_adc_set_ts_status(struct mc13783 *mc13783, unsigned int status)
+{
+        mc13783->ts_active = status;
+}
+EXPORT_SYMBOL_GPL(mc13783_adc_set_ts_status);
+
+static int mc13783_check_revision(struct mc13783 *mc13783)
+{
+        u32 rev_id, rev1, rev2, finid, icid;
+
+        mc13783_read(mc13783, MC13783_REG_REVISION, &rev_id);
+
+        rev1 = (rev_id & 0x018) >> 3;
+        rev2 = (rev_id & 0x007);
+        icid = (rev_id & 0x01C0) >> 6;
+        finid = (rev_id & 0x01E00) >> 9;
+
+        /* Ver 0.2 is actually 3.2a.  Report as 3.2 */
+        if ((rev1 == 0) && (rev2 == 2))
+                rev1 = 3;
+
+        if (rev1 == 0 || icid != 2) {
+                dev_err(mc13783->dev, "No MC13783 detected.\n");
+                return -ENODEV;
+        }
+
+        mc13783->revision = ((rev1 * 10) + rev2);
+        dev_info(mc13783->dev, "MC13783 Rev %d.%d FinVer %x detected\n", rev1,
+               rev2, finid);
+
+        return 0;
+}
+
+/*
+ * Register a client device.  This is non-fatal since there is no need to
+ * fail the entire device init due to a single platform device failing.
+ */
+static void mc13783_client_dev_register(struct mc13783 *mc13783,
+                                       const char *name)
+{
+        struct mfd_cell cell = {};
+
+        cell.name = name;
+
+        mfd_add_devices(mc13783->dev, -1, &cell, 1, NULL, 0);
+}
+
+static int __devinit mc13783_probe(struct spi_device *spi)
+{
+        struct mc13783 *mc13783;
+        struct mc13783_platform_data *pdata = spi->dev.platform_data;
+        int ret;
+
+        mc13783 = kzalloc(sizeof(struct mc13783), GFP_KERNEL);
+        if (!mc13783)
+                return -ENOMEM;
+
+        dev_set_drvdata(&spi->dev, mc13783);
+        spi->mode = SPI_MODE_0 | SPI_CS_HIGH;
+        spi->bits_per_word = 32;
+        spi_setup(spi);
+
+        mc13783->spi_device = spi;
+        mc13783->dev = &spi->dev;
+        mc13783->irq = spi->irq;
+
+        INIT_WORK(&mc13783->work, mc13783_irq_work);
+        mutex_init(&mc13783->io_lock);
+        mutex_init(&mc13783->adc_conv_lock);
+        init_completion(&mc13783->adc_done);
+
+        if (pdata) {
+                mc13783->flags = pdata->flags;
+                mc13783->regulators = pdata->regulators;
+                mc13783->num_regulators = pdata->num_regulators;
+        }
+
+        if (mc13783_check_revision(mc13783)) {
+                ret = -ENODEV;
+                goto err_out;
+        }
+
+        /* clear and mask all interrupts */
+        mc13783_reg_write(mc13783, MC13783_REG_INTERRUPT_STATUS_0, 0x00ffffff);
+        mc13783_reg_write(mc13783, MC13783_REG_INTERRUPT_MASK_0, 0x00ffffff);
+        mc13783_reg_write(mc13783, MC13783_REG_INTERRUPT_STATUS_1, 0x00ffffff);
+        mc13783_reg_write(mc13783, MC13783_REG_INTERRUPT_MASK_1, 0x00ffffff);
+
+        /* unmask adcdone interrupts */
+        mc13783_set_bits(mc13783, MC13783_REG_INTERRUPT_MASK_0,
+                        MC13783_INT_MASK_ADCDONEM, 0);
+
+        ret = request_irq(mc13783->irq, mc13783_interrupt,
+                        IRQF_DISABLED | IRQF_TRIGGER_HIGH, "mc13783",
+                        mc13783);
+        if (ret)
+                goto err_out;
+
+        if (mc13783->flags & MC13783_USE_CODEC)
+                mc13783_client_dev_register(mc13783, "mc13783-codec");
+        if (mc13783->flags & MC13783_USE_ADC)
+                mc13783_client_dev_register(mc13783, "mc13783-adc");
+        if (mc13783->flags & MC13783_USE_RTC)
+                mc13783_client_dev_register(mc13783, "mc13783-rtc");
+        if (mc13783->flags & MC13783_USE_REGULATOR)
+                mc13783_client_dev_register(mc13783, "mc13783-regulator");
+        if (mc13783->flags & MC13783_USE_TOUCHSCREEN)
+                mc13783_client_dev_register(mc13783, "mc13783-ts");
+
+        return 0;
+
+err_out:
+        kfree(mc13783);
+        return ret;
+}
+
+static int __devexit mc13783_remove(struct spi_device *spi)
+{
+        struct mc13783 *mc13783;
+
+        mc13783 = dev_get_drvdata(&spi->dev);
+
+        free_irq(mc13783->irq, mc13783);
+
+        mfd_remove_devices(&spi->dev);
+
+        return 0;
+}
+
+static struct spi_driver pmic_driver = {
+        .driver = {
+                   .name = "mc13783",
+                   .bus = &spi_bus_type,
+                   .owner = THIS_MODULE,
+        },
+        .probe = mc13783_probe,
+        .remove = __devexit_p(mc13783_remove),
+};
+
+static int __init pmic_init(void)
+{
+        return spi_register_driver(&pmic_driver);
+}
+subsys_initcall(pmic_init);
+
+static void __exit pmic_exit(void)
+{
+        spi_unregister_driver(&pmic_driver);
+}
+module_exit(pmic_exit);
+
+MODULE_DESCRIPTION("Core/Protocol driver for Freescale MC13783 PMIC");
+MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
+MODULE_LICENSE("GPL");
+