misc:pmic:core New generic PMIC driver

I2C or SPI PMIC devices can be accessed.
Separate files: pmic_i2c.c and pmic_spi.c are responsible
for handling transmission over I2C or SPI bus.

New flags:
CONFIG_PMIC - enable PMIC general device.
CONFIG_PMIC_I2C/SPI - specify the interface to be used.

Signed-off-by: Lukasz Majewski <l.majewski@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Cc: Stefano Babic <sbabic@denx.de>

1 files changed, 109 insertions, 0 deletions

diff --git a/drivers/misc/pmic_spi.c b/drivers/misc/pmic_spi.c
new file mode 100644
index 0000000..ff35377
--- /dev/null
+++ b/drivers/misc/pmic_spi.c
@@ -0,0 +1,109 @@
+/*
+ * Copyright (C) 2011 Samsung Electronics
+ * Lukasz Majewski <l.majewski@samsung.com>
+ *
+ * (C) Copyright 2010
+ * Stefano Babic, DENX Software Engineering, sbabic@denx.de
+ *
+ * (C) Copyright 2008-2009 Freescale Semiconductor, Inc.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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 <linux/types.h>
+#include <pmic.h>
+#include <spi.h>
+
+static struct spi_slave *slave;
+
+void pmic_spi_free(struct spi_slave *slave)
+{
+	if (slave)
+		spi_free_slave(slave);
+}
+
+struct spi_slave *pmic_spi_probe(struct pmic *p)
+{
+	return spi_setup_slave(p->bus,
+		p->hw.spi.cs,
+		p->hw.spi.clk,
+		p->hw.spi.mode);
+}
+
+static u32 pmic_reg(struct pmic *p, u32 reg, u32 *val, u32 write)
+{
+	u32 pmic_tx, pmic_rx;
+	u32 tmp;
+
+	if (!slave) {
+		slave = pmic_spi_probe(p);
+
+		if (!slave)
+			return -1;
+	}
+
+	if (check_reg(reg))
+		return -1;
+
+	if (spi_claim_bus(slave))
+		return -1;
+
+	pmic_tx = p->hw.spi.prepare_tx(reg, val, write);
+
+	tmp = cpu_to_be32(pmic_tx);
+
+	if (spi_xfer(slave, pmic_spi_bitlen, &tmp, &pmic_rx,
+			pmic_spi_flags)) {
+		spi_release_bus(slave);
+		return -1;
+	}
+
+	if (write) {
+		pmic_tx = p->hw.spi.prepare_tx(0, NULL, write);
+		pmic_tx &= ~(1 << 31);
+		tmp = cpu_to_be32(pmic_tx);
+		if (spi_xfer(slave, pmic_spi_bitlen, &tmp, &pmic_rx,
+			pmic_spi_flags)) {
+			spi_release_bus(slave);
+			return -1;
+		}
+	}
+
+	spi_release_bus(slave);
+	*val = cpu_to_be32(pmic_rx);
+
+	return 0;
+}
+
+int pmic_reg_write(struct pmic *p, u32 reg, u32 val)
+{
+	if (pmic_reg(p, reg, &val, 1))
+		return -1;
+
+	return 0;
+}
+
+int pmic_reg_read(struct pmic *p, u32 reg, u32 *val)
+{
+	if (pmic_reg(p, reg, val, 0))
+		return -1;
+
+	return 0;
+}