mfd: add mc34708 driver

this driver is a copie of the mc13892 one

Signed-off-by: Eric Bénard <eric@eukrea.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

3 files changed, 299 insertions, 0 deletions

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 87797de323..b080c1c47a 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -8,6 +8,10 @@ config I2C_MC34704
 	depends on I2C
 	bool "MC34704 PMIC driver"
 
+config I2C_MC34708
+	depends on I2C
+	bool "MC34708 PMIC driver"
+
 config I2C_MC9SDZ60
 	depends on I2C
 	bool "MC9SDZ60 driver"
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 1171335b28..bc9e0e8b1f 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -1,5 +1,6 @@
 obj-$(CONFIG_I2C_MC13892) += mc13892.o
 obj-$(CONFIG_I2C_MC34704) += mc34704.o
+obj-$(CONFIG_I2C_MC34708) += mc34708.o
 obj-$(CONFIG_I2C_MC9SDZ60) += mc9sdz60.o
 obj-$(CONFIG_I2C_LP3972) += lp3972.o
 obj-$(CONFIG_I2C_TWLCORE) += twl-core.o
diff --git a/drivers/mfd/mc34708.c b/drivers/mfd/mc34708.c
new file mode 100644
index 0000000000..e7f40c02b7
--- /dev/null
+++ b/drivers/mfd/mc34708.c
@@ -0,0 +1,294 @@
+/*
+ * Copyright (C) 2007 Sascha Hauer, Pengutronix
+ *               2009 Marc Kleine-Budde <mkl@pengutronix.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., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ *
+ */
+
+#include <common.h>
+#include <init.h>
+#include <driver.h>
+#include <xfuncs.h>
+#include <errno.h>
+#include <spi/spi.h>
+#include <malloc.h>
+
+#include <i2c/i2c.h>
+#include <mfd/mc34708.h>
+
+#define DRIVERNAME		"mc34708"
+
+#define to_mc34708(a)		container_of(a, struct mc34708, cdev)
+
+static struct mc34708 *mc_dev;
+
+struct mc34708 *mc34708_get(void)
+{
+	if (!mc_dev)
+		return NULL;
+
+	return mc_dev;
+}
+EXPORT_SYMBOL(mc34708_get);
+
+#ifdef CONFIG_SPI
+static int spi_rw(struct spi_device *spi, void * buf, size_t len)
+{
+	int ret;
+
+	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 ((ret = spi_sync(spi, &m)))
+		return ret;
+	return 0;
+}
+
+#define MXC_PMIC_REG_NUM(reg)	(((reg) & 0x3f) << 25)
+#define MXC_PMIC_WRITE		(1 << 31)
+
+static int mc34708_spi_reg_read(struct mc34708 *mc34708, enum mc34708_reg reg, u32 *val)
+{
+	uint32_t buf;
+
+	buf = MXC_PMIC_REG_NUM(reg);
+
+	spi_rw(mc34708->spi, &buf, 4);
+
+	*val = buf;
+
+	return 0;
+}
+
+static int mc34708_spi_reg_write(struct mc34708 *mc34708, enum mc34708_reg reg, u32 val)
+{
+	uint32_t buf = MXC_PMIC_REG_NUM(reg) | MXC_PMIC_WRITE | (val & 0xffffff);
+
+	spi_rw(mc34708->spi, &buf, 4);
+
+	return 0;
+}
+#endif
+
+#ifdef CONFIG_I2C
+static int mc34708_i2c_reg_read(struct mc34708 *mc34708, enum mc34708_reg reg, u32 *val)
+{
+	u8 buf[3];
+	int ret;
+
+	ret = i2c_read_reg(mc34708->client, reg, buf, 3);
+	*val = buf[0] << 16 | buf[1] << 8 | buf[2] << 0;
+
+	return ret == 3 ? 0 : ret;
+}
+
+static int mc34708_i2c_reg_write(struct mc34708 *mc34708, enum mc34708_reg reg, u32 val)
+{
+	u8 buf[] = {
+		val >> 16,
+		val >>  8,
+		val >>  0,
+	};
+	int ret;
+
+	ret = i2c_write_reg(mc34708->client, reg, buf, 3);
+
+	return ret == 3 ? 0 : ret;
+}
+#endif
+
+int mc34708_reg_write(struct mc34708 *mc34708, enum mc34708_reg reg, u32 val)
+{
+#ifdef CONFIG_I2C
+	if (mc34708->mode == MC34708_MODE_I2C)
+		return mc34708_i2c_reg_write(mc34708, reg, val);
+#endif
+#ifdef CONFIG_SPI
+	if (mc34708->mode == MC34708_MODE_SPI)
+		return mc34708_spi_reg_write(mc34708, reg, val);
+#endif
+	return -EINVAL;
+}
+EXPORT_SYMBOL(mc34708_reg_write);
+
+int mc34708_reg_read(struct mc34708 *mc34708, enum mc34708_reg reg, u32 *val)
+{
+#ifdef CONFIG_I2C
+	if (mc34708->mode == MC34708_MODE_I2C)
+		return mc34708_i2c_reg_read(mc34708, reg, val);
+#endif
+#ifdef CONFIG_SPI
+	if (mc34708->mode == MC34708_MODE_SPI)
+		return mc34708_spi_reg_read(mc34708, reg, val);
+#endif
+	return -EINVAL;
+}
+EXPORT_SYMBOL(mc34708_reg_read);
+
+int mc34708_set_bits(struct mc34708 *mc34708, enum mc34708_reg reg, u32 mask, u32 val)
+{
+	u32 tmp;
+	int err;
+
+	err = mc34708_reg_read(mc34708, reg, &tmp);
+	tmp = (tmp & ~mask) | val;
+
+	if (!err)
+		err = mc34708_reg_write(mc34708, reg, tmp);
+
+	return err;
+}
+EXPORT_SYMBOL(mc34708_set_bits);
+
+static ssize_t mc_read(struct cdev *cdev, void *_buf, size_t count, ulong offset, ulong flags)
+{
+	struct mc34708 *priv = to_mc34708(cdev);
+	u32 *buf = _buf;
+	size_t i = count >> 2;
+	int err;
+
+	offset >>= 2;
+
+	while (i) {
+		err = mc34708_reg_read(priv, offset, buf);
+		if (err)
+			return (ssize_t)err;
+		buf++;
+		i--;
+		offset++;
+	}
+
+	return count;
+}
+
+static ssize_t mc_write(struct cdev *cdev, const void *_buf, size_t count, ulong offset, ulong flags)
+{
+	struct mc34708 *mc34708 = to_mc34708(cdev);
+	const u32 *buf = _buf;
+	size_t i = count >> 2;
+	int err;
+
+	offset >>= 2;
+
+	while (i) {
+		err = mc34708_reg_write(mc34708, offset, *buf);
+		if (err)
+			return (ssize_t)err;
+		buf++;
+		i--;
+		offset++;
+	}
+
+	return count;
+}
+
+static struct file_operations mc_fops = {
+	.lseek	= dev_lseek_default,
+	.read	= mc_read,
+	.write	= mc_write,
+};
+
+static int mc34708_query_revision(struct mc34708 *mc34708)
+{
+	unsigned int rev_id;
+	int rev;
+
+	mc34708_reg_read(mc34708, 7, &rev_id);
+
+	if (rev_id > 0xFFF)
+		return -EINVAL;
+
+	rev = rev_id & 0xFFF;
+
+	dev_info(mc_dev->cdev.dev, "MC34708 ID: 0x%04x\n", rev);
+
+	mc34708->revision = rev;
+
+	return rev;
+}
+
+static int mc_probe(struct device_d *dev, enum mc34708_mode mode)
+{
+	int rev;
+
+	if (mc_dev)
+		return -EBUSY;
+
+	mc_dev = xzalloc(sizeof(struct mc34708));
+	mc_dev->mode = mode;
+	mc_dev->cdev.name = DRIVERNAME;
+	if (mode == MC34708_MODE_I2C) {
+		mc_dev->client = to_i2c_client(dev);
+	}
+	if (mode == MC34708_MODE_SPI) {
+		mc_dev->spi = dev->type_data;
+		mc_dev->spi->mode = SPI_MODE_0 | SPI_CS_HIGH;
+		mc_dev->spi->bits_per_word = 32;
+	}
+	mc_dev->cdev.size = 256;
+	mc_dev->cdev.dev = dev;
+	mc_dev->cdev.ops = &mc_fops;
+
+	rev = mc34708_query_revision(mc_dev);
+	if (rev < 0) {
+		free(mc_dev);
+		mc_dev = NULL;
+		return -EINVAL;
+	}
+
+	devfs_create(&mc_dev->cdev);
+
+	return 0;
+}
+
+static int mc_i2c_probe(struct device_d *dev)
+{
+	return mc_probe(dev, MC34708_MODE_I2C);
+}
+
+static int mc_spi_probe(struct device_d *dev)
+{
+	return mc_probe(dev, MC34708_MODE_SPI);
+}
+
+static struct driver_d mc_i2c_driver = {
+	.name  = "mc34708-i2c",
+	.probe = mc_i2c_probe,
+};
+
+static struct driver_d mc_spi_driver = {
+	.name  = "mc34708-spi",
+	.probe = mc_spi_probe,
+};
+
+static int mc_init(void)
+{
+        register_driver(&mc_i2c_driver);
+        register_driver(&mc_spi_driver);
+        return 0;
+}
+
+device_initcall(mc_init);