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, 147 insertions, 0 deletions

diff --git a/drivers/misc/pmic_core.c b/drivers/misc/pmic_core.c
new file mode 100644
index 0000000..5d62a56
--- /dev/null
+++ b/drivers/misc/pmic_core.c
@@ -0,0 +1,147 @@
+/*
+ * 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>
+
+static struct pmic pmic;
+
+int check_reg(u32 reg)
+{
+	if (reg >= pmic.number_of_regs) {
+		printf("<reg num> = %d is invalid. Should be less than %d\n",
+		       reg, pmic.number_of_regs);
+		return -1;
+	}
+	return 0;
+}
+
+int pmic_set_output(struct pmic *p, u32 reg, int out, int on)
+{
+	u32 val;
+
+	if (pmic_reg_read(p, reg, &val))
+		return -1;
+
+	if (on)
+		val |= out;
+	else
+		val &= ~out;
+
+	if (pmic_reg_write(p, reg, val))
+		return -1;
+
+	return 0;
+}
+
+static void pmic_show_info(struct pmic *p)
+{
+	printf("PMIC: %s\n", p->name);
+}
+
+static void pmic_dump(struct pmic *p)
+{
+	int i, ret;
+	u32 val;
+
+	pmic_show_info(p);
+	for (i = 0; i < p->number_of_regs; i++) {
+		ret = pmic_reg_read(p, i, &val);
+		if (ret)
+			puts("PMIC: Registers dump failed\n");
+
+		if (!(i % 8))
+			printf("\n0x%02x: ", i);
+
+		printf("%08x ", val);
+	}
+	puts("\n");
+}
+
+struct pmic *get_pmic(void)
+{
+	return &pmic;
+}
+
+int do_pmic(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+	u32 ret, reg, val;
+	char *cmd;
+
+	struct pmic *p = &pmic;
+
+	/* at least two arguments please */
+	if (argc < 2)
+		return cmd_usage(cmdtp);
+
+	cmd = argv[1];
+	if (strcmp(cmd, "dump") == 0) {
+		pmic_dump(p);
+		return 0;
+	}
+
+	if (strcmp(cmd, "read") == 0) {
+		if (argc < 3)
+			return cmd_usage(cmdtp);
+
+		reg = simple_strtoul(argv[2], NULL, 16);
+
+		ret = pmic_reg_read(p, reg, &val);
+
+		if (ret)
+			puts("PMIC: Register read failed\n");
+
+		printf("\n0x%02x: 0x%08x\n", reg, val);
+
+		return 0;
+	}
+
+	if (strcmp(cmd, "write") == 0) {
+		if (argc < 4)
+			return cmd_usage(cmdtp);
+
+		reg = simple_strtoul(argv[2], NULL, 16);
+		val = simple_strtoul(argv[3], NULL, 16);
+
+		pmic_reg_write(p, reg, val);
+
+		return 0;
+	}
+
+	/* No subcommand found */
+	return 1;
+}
+
+U_BOOT_CMD(
+	pmic,	CONFIG_SYS_MAXARGS, 1, do_pmic,
+	"PMIC",
+	"dump - dump PMIC registers\n"
+	"pmic read <reg> - read register\n"
+	"pmic write <reg> <value> - write register"
+);