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>

1 files changed, 427 insertions, 0 deletions

diff --git a/drivers/mfd/mc13783-core.c b/drivers/mfd/mc13783-core.c
new file mode 100644
index 0000000..e354d29
--- /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");
+