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path: root/drivers/power/pmic_i2c.c
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Diffstat (limited to 'drivers/power/pmic_i2c.c')
-rw-r--r--drivers/power/pmic_i2c.c125
1 files changed, 125 insertions, 0 deletions
diff --git a/drivers/power/pmic_i2c.c b/drivers/power/pmic_i2c.c
new file mode 100644
index 0000000000..3e5a784cf5
--- /dev/null
+++ b/drivers/power/pmic_i2c.c
@@ -0,0 +1,125 @@
+/*
+ * 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 <power/pmic.h>
+#include <i2c.h>
+#include <compiler.h>
+
+int pmic_reg_write(struct pmic *p, u32 reg, u32 val)
+{
+ unsigned char buf[4] = { 0 };
+
+ if (check_reg(p, reg))
+ return -1;
+
+ switch (pmic_i2c_tx_num) {
+ case 3:
+ if (p->sensor_byte_order == PMIC_SENSOR_BYTE_ORDER_BIG) {
+ buf[2] = (cpu_to_le32(val) >> 16) & 0xff;
+ buf[1] = (cpu_to_le32(val) >> 8) & 0xff;
+ buf[0] = cpu_to_le32(val) & 0xff;
+ } else {
+ buf[0] = (cpu_to_le32(val) >> 16) & 0xff;
+ buf[1] = (cpu_to_le32(val) >> 8) & 0xff;
+ buf[2] = cpu_to_le32(val) & 0xff;
+ }
+ break;
+ case 2:
+ if (p->sensor_byte_order == PMIC_SENSOR_BYTE_ORDER_BIG) {
+ buf[1] = (cpu_to_le32(val) >> 8) & 0xff;
+ buf[0] = cpu_to_le32(val) & 0xff;
+ } else {
+ buf[0] = (cpu_to_le32(val) >> 8) & 0xff;
+ buf[1] = cpu_to_le32(val) & 0xff;
+ }
+ break;
+ case 1:
+ buf[0] = cpu_to_le32(val) & 0xff;
+ break;
+ default:
+ printf("%s: invalid tx_num: %d", __func__, pmic_i2c_tx_num);
+ return -1;
+ }
+
+ 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(p, 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:
+ if (p->sensor_byte_order == PMIC_SENSOR_BYTE_ORDER_BIG)
+ ret_val = le32_to_cpu(buf[2] << 16
+ | buf[1] << 8 | buf[0]);
+ else
+ ret_val = le32_to_cpu(buf[0] << 16 |
+ buf[1] << 8 | buf[2]);
+ break;
+ case 2:
+ if (p->sensor_byte_order == PMIC_SENSOR_BYTE_ORDER_BIG)
+ ret_val = le32_to_cpu(buf[1] << 8 | buf[0]);
+ else
+ ret_val = le32_to_cpu(buf[0] << 8 | buf[1]);
+ break;
+ case 1:
+ ret_val = le32_to_cpu(buf[0]);
+ break;
+ default:
+ printf("%s: invalid tx_num: %d", __func__, pmic_i2c_tx_num);
+ return -1;
+ }
+ memcpy(val, &ret_val, sizeof(ret_val));
+
+ return 0;
+}
+
+int pmic_probe(struct pmic *p)
+{
+ I2C_SET_BUS(p->bus);
+ debug("Bus: %d PMIC:%s probed!\n", p->bus, p->name);
+ if (i2c_probe(pmic_i2c_addr)) {
+ printf("Can't find PMIC:%s\n", p->name);
+ return -1;
+ }
+
+ return 0;
+}