diff options
Diffstat (limited to 'drivers/mxc/mcu_pmic/max8660.c')
| -rw-r--r-- | drivers/mxc/mcu_pmic/max8660.c | 154 |
1 files changed, 154 insertions, 0 deletions
diff --git a/drivers/mxc/mcu_pmic/max8660.c b/drivers/mxc/mcu_pmic/max8660.c new file mode 100644 index 000000000000..17fe22958ca9 --- /dev/null +++ b/drivers/mxc/mcu_pmic/max8660.c @@ -0,0 +1,154 @@ +/* + * Copyright 2008-2010 Freescale Semiconductor, Inc. All Rights Reserved. + */ + +/* + * The code contained herein is licensed under the GNU General Public + * License. You may obtain a copy of the GNU General Public License + * Version 2 or later at the following locations: + * + * http://www.opensource.org/licenses/gpl-license.html + * http://www.gnu.org/copyleft/gpl.html + */ + +/*! + * @file max8660.c + * @brief Driver for max8660 + * + * @ingroup pmic + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/delay.h> +#include <linux/spinlock.h> +#include <linux/proc_fs.h> +#include <linux/i2c.h> +#include <linux/mfd/mc9s08dz60/pmic.h> +#include <asm/uaccess.h> +#include "mcu_pmic_core.h" +#include "max8660.h" + +/* I2C bus id and device address of mcu */ +#define I2C1_BUS 0 +#define MAX8660_I2C_ADDR 0x68 + +static struct i2c_client *max8660_i2c_client; + + /* reg names for max8660 + REG_MAX8660_OUTPUT_ENABLE_1, + REG_MAX8660_OUTPUT_ENABLE_2, + REG_MAX8660_VOLT__CHANGE_1, + REG_MAX8660_V3_TARGET_VOLT_1, + REG_MAX8660_V3_TARGET_VOLT_2, + REG_MAX8660_V4_TARGET_VOLT_1, + REG_MAX8660_V4_TARGET_VOLT_2, + REG_MAX8660_V5_TARGET_VOLT_1, + REG_MAX8660_V5_TARGET_VOLT_2, + REG_MAX8660_V6V7_TARGET_VOLT, + REG_MAX8660_FORCE_PWM + */ + + /* save down the reg values for the device is write only */ +static u8 max8660_reg_value_table[] = { + 0x0, 0x0, 0x0, 0x17, 0x17, 0x1F, 0x1F, 0x04, 0x04, 0x0, 0x0 +}; +static int max8660_dev_present; + +int is_max8660_present(void) +{ + return max8660_dev_present; +} + +int max8660_get_buffered_reg_val(int reg_name, u8 *value) +{ + if (!max8660_dev_present) + return -1; + /* outof range */ + if (reg_name < REG_MAX8660_OUTPUT_ENABLE_1 + || reg_name > REG_MAX8660_FORCE_PWM) + return -1; + *value = + max8660_reg_value_table[reg_name - REG_MAX8660_OUTPUT_ENABLE_1]; + return 0; +} +int max8660_save_buffered_reg_val(int reg_name, u8 value) +{ + + /* outof range */ + if (reg_name < REG_MAX8660_OUTPUT_ENABLE_1 + || reg_name > REG_MAX8660_FORCE_PWM) + return -1; + max8660_reg_value_table[reg_name - REG_MAX8660_OUTPUT_ENABLE_1] = value; + return 0; +} + +int max8660_write_reg(u8 reg, u8 value) +{ + if (max8660_dev_present && (i2c_smbus_write_byte_data( + max8660_i2c_client, reg, value) >= 0)) + return 0; + return -1; +} + +/*! + * max8660 I2C attach function + * + * @param adapter struct i2c_client * + * @return 0 for max8660 successfully detected + */ +static int max8660_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + int retval; + max8660_i2c_client = client; + retval = i2c_smbus_write_byte_data(max8660_i2c_client, + MAX8660_OUTPUT_ENABLE_1, 0); + if (retval == 0) { + max8660_dev_present = 1; + pr_info("max8660 probed !\n"); + } else { + max8660_dev_present = 0; + pr_info("max8660 not detected!\n"); + } + return retval; +} + +/*! + * max8660 I2C detach function + * + * @param client struct i2c_client * + * @return 0 + */ +static int max8660_remove(struct i2c_client *client) +{ + return 0; +} + +static const struct i2c_device_id max8660_id[] = { + { "max8660", 0 }, + {}, +}; +MODULE_DEVICE_TABLE(i2c, max8660_id); + +static struct i2c_driver max8660_i2c_driver = { + .driver = { + .owner = THIS_MODULE, + .name = "max8660",}, + .probe = max8660_probe, + .remove = max8660_remove, + .id_table = max8660_id, +}; + +/* called by pmic core when init*/ +int max8660_init(void) +{ + int err; + err = i2c_add_driver(&max8660_i2c_driver); + return err; +} +void max8660_exit(void) +{ + i2c_del_driver(&max8660_i2c_driver); +} |