diff options
Diffstat (limited to 'drivers/regulator/reg-mc34704.c')
| -rw-r--r-- | drivers/regulator/reg-mc34704.c | 289 |
1 files changed, 289 insertions, 0 deletions
diff --git a/drivers/regulator/reg-mc34704.c b/drivers/regulator/reg-mc34704.c new file mode 100644 index 000000000000..7fb3732b9e03 --- /dev/null +++ b/drivers/regulator/reg-mc34704.c @@ -0,0 +1,289 @@ +/* + * 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 + */ + +#include <linux/module.h> +#include <linux/moduleparam.h> +#include <linux/init.h> +#include <linux/delay.h> +#include <linux/pm.h> +#include <linux/bitops.h> +#include <linux/err.h> +#include <linux/ioctl.h> +#include <linux/regulator/machine.h> +#include <linux/regulator/driver.h> +#include <linux/mfd/mc34704/core.h> +#include <linux/platform_device.h> +#include <linux/pmic_status.h> +#include <linux/pmic_external.h> + +#define MC34704_ONOFFA 0x8 +#define MC34704_ONOFFC 0x4 +#define MC34704_ONOFFD 0x2 +#define MC34704_ONOFFE 0x1 + +/* Private data for MC34704 regulators */ + +struct reg_mc34704_priv { + short enable; /* enable bit, if available */ + short v_default; /* default regulator voltage in mV */ + int dvs_min; /* minimum voltage change in units of 2.5% */ + int dvs_max; /* maximum voltage change in units of 2.5% */ + char i2c_dvs; /* i2c DVS register number */ + char i2c_stat; /* i2c status register number */ +}; +struct reg_mc34704_priv mc34704_reg_priv[] = { + { + .v_default = REG1_V_MV, + .dvs_min = REG1_DVS_MIN_PCT / 2.5, + .dvs_max = REG1_DVS_MAX_PCT / 2.5, + .i2c_dvs = 0x4, + .i2c_stat = 0x5, + .enable = MC34704_ONOFFA, + }, + { + .v_default = REG2_V_MV, + .dvs_min = REG2_DVS_MIN_PCT / 2.5, + .dvs_max = REG2_DVS_MAX_PCT / 2.5, + .i2c_dvs = 0x6, + .i2c_stat = 0x7, + }, + { + .v_default = REG3_V_MV, + .dvs_min = REG3_DVS_MIN_PCT / 2.5, + .dvs_max = REG3_DVS_MAX_PCT / 2.5, + .i2c_dvs = 0x8, + .i2c_stat = 0x9, + }, + { + .v_default = REG4_V_MV, + .dvs_min = REG4_DVS_MIN_PCT / 2.5, + .dvs_max = REG4_DVS_MAX_PCT / 2.5, + .i2c_dvs = 0xA, + .i2c_stat = 0xB, + }, + { + .v_default = REG5_V_MV, + .dvs_min = REG5_DVS_MIN_PCT / 2.5, + .dvs_max = REG5_DVS_MAX_PCT / 2.5, + .i2c_dvs = 0xC, + .i2c_stat = 0xE, + .enable = MC34704_ONOFFE, + }, +}; + +static int mc34704_set_voltage(struct regulator_dev *reg, int MiniV, int uV) +{ + struct reg_mc34704_priv *priv = rdev_get_drvdata(reg); + int mV = uV / 1000; + int dV = mV - priv->v_default; + + /* compute dynamic voltage scaling value */ + int dvs = 1000 * dV / priv->v_default / 25; + + /* clip to regulator limits */ + if (dvs > priv->dvs_max) + dvs = priv->dvs_max; + if (dvs < priv->dvs_min) + dvs = priv->dvs_min; + + return pmic_write_reg(priv->i2c_dvs, dvs << 1, 0x1E); +} + +static int mc34704_get_voltage(struct regulator_dev *reg) +{ + int mV; + struct reg_mc34704_priv *priv = rdev_get_drvdata(reg); + int val, dvs; + + CHECK_ERROR(pmic_read_reg(priv->i2c_dvs, &val, 0xF)); + + dvs = (val >> 1) & 0xF; + + /* dvs is 4-bit 2's complement; sign-extend it */ + if (dvs & 8) + dvs |= -1 & ~0xF; + + /* Regulator voltage is adjusted by (dvs * 2.5%) */ + mV = priv->v_default * (1000 + 25 * dvs) / 1000; + + return 1000 * mV; +} + +static int mc34704_enable_reg(struct regulator_dev *reg) +{ + struct reg_mc34704_priv *priv = rdev_get_drvdata(reg); + + if (priv->enable) + return pmic_write_reg(REG_MC34704_GENERAL2, -1, priv->enable); + + return PMIC_ERROR; +} + +static int mc34704_disable_reg(struct regulator_dev *reg) +{ + struct reg_mc34704_priv *priv = rdev_get_drvdata(reg); + + if (priv->enable) + return pmic_write_reg(REG_MC34704_GENERAL2, 0, priv->enable); + + return PMIC_ERROR; +} + +static int mc34704_is_reg_enabled(struct regulator_dev *reg) +{ + struct reg_mc34704_priv *priv = rdev_get_drvdata(reg); + int val; + + if (priv->enable) { + CHECK_ERROR(pmic_read_reg(REG_MC34704_GENERAL2, &val, + priv->enable)); + return val ? 1 : 0; + } else { + return PMIC_ERROR; + } +} + +static struct regulator_ops mc34704_full_ops = { + .set_voltage = mc34704_set_voltage, + .get_voltage = mc34704_get_voltage, + .enable = mc34704_enable_reg, + .disable = mc34704_disable_reg, + .is_enabled = mc34704_is_reg_enabled, +}; + +static struct regulator_ops mc34704_partial_ops = { + .set_voltage = mc34704_set_voltage, + .get_voltage = mc34704_get_voltage, +}; + +static struct regulator_desc reg_mc34704[] = { + { + .name = "REG1_BKLT", + .id = MC34704_BKLT, + .ops = &mc34704_full_ops, + .irq = 0, + .type = REGULATOR_VOLTAGE, + .owner = THIS_MODULE}, + { + .name = "REG2_CPU", + .id = MC34704_CPU, + .ops = &mc34704_partial_ops, + .irq = 0, + .type = REGULATOR_VOLTAGE, + .owner = THIS_MODULE}, + { + .name = "REG3_CORE", + .id = MC34704_CORE, + .ops = &mc34704_partial_ops, + .irq = 0, + .type = REGULATOR_VOLTAGE, + .owner = THIS_MODULE}, + { + .name = "REG4_DDR", + .id = MC34704_DDR, + .ops = &mc34704_partial_ops, + .irq = 0, + .type = REGULATOR_VOLTAGE, + .owner = THIS_MODULE}, + { + .name = "REG5_PERS", + .id = MC34704_PERS, + .ops = &mc34704_full_ops, + .irq = 0, + .type = REGULATOR_VOLTAGE, + .owner = THIS_MODULE}, +}; + +static int mc34704_regulator_probe(struct platform_device *pdev) +{ + struct regulator_dev *rdev; + + /* register regulator */ + rdev = regulator_register(®_mc34704[pdev->id], &pdev->dev, + pdev->dev.platform_data, + (void *)&mc34704_reg_priv[pdev->id]); + if (IS_ERR(rdev)) { + dev_err(&pdev->dev, "failed to register %s\n", + reg_mc34704[pdev->id].name); + return PTR_ERR(rdev); + } + + return 0; +} + +static int mc34704_regulator_remove(struct platform_device *pdev) +{ + struct regulator_dev *rdev = platform_get_drvdata(pdev); + + regulator_unregister(rdev); + + return 0; +} + +int mc34704_register_regulator(struct mc34704 *mc34704, int reg, + struct regulator_init_data *initdata) +{ + struct platform_device *pdev; + int ret; + + if (mc34704->pmic.pdev[reg]) + return -EBUSY; + + pdev = platform_device_alloc("mc34704-regulatr", reg); + if (!pdev) + return -ENOMEM; + + mc34704->pmic.pdev[reg] = pdev; + + initdata->driver_data = mc34704; + + pdev->dev.platform_data = initdata; + + pdev->dev.parent = mc34704->dev; + platform_set_drvdata(pdev, mc34704); + ret = platform_device_add(pdev); + + if (ret != 0) { + dev_err(mc34704->dev, "Failed to register regulator %d: %d\n", + reg, ret); + platform_device_del(pdev); + mc34704->pmic.pdev[reg] = NULL; + } + + return ret; +} +EXPORT_SYMBOL_GPL(mc34704_register_regulator); + +static struct platform_driver mc34704_regulator_driver = { + .probe = mc34704_regulator_probe, + .remove = mc34704_regulator_remove, + .driver = { + .name = "mc34704-regulatr", + }, +}; + +static int __init mc34704_regulator_init(void) +{ + return platform_driver_register(&mc34704_regulator_driver); +} +subsys_initcall(mc34704_regulator_init); + +static void __exit mc34704_regulator_exit(void) +{ + platform_driver_unregister(&mc34704_regulator_driver); +} +module_exit(mc34704_regulator_exit); + +MODULE_AUTHOR("Freescale Semiconductor, Inc."); +MODULE_DESCRIPTION("MC34704 Regulator Driver"); +MODULE_LICENSE("GPL"); |