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, 92 insertions, 0 deletions

diff --git a/drivers/misc/pmic_i2c.c b/drivers/misc/pmic_i2c.c
new file mode 100644
index 0000000..b82e899
--- /dev/null
+++ b/drivers/misc/pmic_i2c.c
@@ -0,0 +1,92 @@
+/*
+ * 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 <i2c.h>
+
+int pmic_reg_write(struct pmic *p, u32 reg, u32 val)
+{
+	unsigned char buf[4] = { 0 };
+
+	if (check_reg(reg))
+		return -1;
+
+	switch (pmic_i2c_tx_num) {
+	case 3:
+		buf[0] = (val >> 16) & 0xff;
+		buf[1] = (val >> 8) & 0xff;
+		buf[2] = val & 0xff;
+		break;
+	case 1:
+		buf[0] = val & 0xff;
+		break;
+	}
+
+	if (i2c_write(pmic_i2c_addr, reg, 1, buf, pmic_i2c_tx_num))
+		return -1;
+
+	return 0;
+}
+
+int pmic_reg_read(struct pmic *p, u32 reg, u32 *val)
+{
+	unsigned char buf[4] = { 0 };
+	u32 ret_val = 0;
+
+	if (check_reg(reg))
+		return -1;
+
+	if (i2c_read(pmic_i2c_addr, reg, 1, buf, pmic_i2c_tx_num))
+		return -1;
+
+	switch (pmic_i2c_tx_num) {
+	case 3:
+		ret_val = buf[0] << 16 | buf[1] << 8 | buf[2];
+		break;
+	case 1:
+		ret_val = buf[0];
+		break;
+	}
+	memcpy(val, &ret_val, sizeof(ret_val));
+
+	return 0;
+}
+
+int pmic_probe(struct pmic *p)
+{
+	i2c_set_bus_num(p->bus);
+	debug("PMIC:%s probed!\n", p->name);
+	if (i2c_probe(pmic_i2c_addr)) {
+		printf("Can't find PMIC:%s\n", p->name);
+		return -1;
+	}
+
+	return 0;
+}