diff options
Diffstat (limited to 'drivers/power/pmic_i2c.c')
| -rw-r--r-- | drivers/power/pmic_i2c.c | 125 |
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; +} |