diff options
Diffstat (limited to 'drivers/regulator/pcf50606-regulator.c')
| -rw-r--r-- | drivers/regulator/pcf50606-regulator.c | 358 |
1 files changed, 358 insertions, 0 deletions
diff --git a/drivers/regulator/pcf50606-regulator.c b/drivers/regulator/pcf50606-regulator.c new file mode 100644 index 00000000000..ae3193f3104 --- /dev/null +++ b/drivers/regulator/pcf50606-regulator.c @@ -0,0 +1,358 @@ +/* NXP PCF50606 PMIC Driver + * + * (C) 2006-2008 by Openmoko, Inc. + * Author: Balaji Rao <balajirrao@openmoko.org> + * All rights reserved. + * + * Broken down from monstrous PCF50606 driver mainly by + * Harald Welte and Andy Green and Werner Almesberger + * + * 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. + * + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/device.h> +#include <linux/err.h> +#include <linux/platform_device.h> + +#include <linux/mfd/pcf50606/core.h> +#include <linux/mfd/pcf50606/pmic.h> + +#define PCF50606_REGULATOR(_name, _id) \ + { \ + .name = _name, \ + .id = _id, \ + .ops = &pcf50606_regulator_ops, \ + .type = REGULATOR_VOLTAGE, \ + .owner = THIS_MODULE, \ + } + +static const uint8_t pcf50606_regulator_registers[PCF50606_NUM_REGULATORS] = { + [PCF50606_REGULATOR_DCD] = PCF50606_REG_DCDC1, + [PCF50606_REGULATOR_DCDE] = PCF50606_REG_DCDEC1, + [PCF50606_REGULATOR_DCUD] = PCF50606_REG_DCUDC1, + [PCF50606_REGULATOR_D1REG] = PCF50606_REG_D1REGC1, + [PCF50606_REGULATOR_D2REG] = PCF50606_REG_D2REGC1, + [PCF50606_REGULATOR_D3REG] = PCF50606_REG_D3REGC1, + [PCF50606_REGULATOR_LPREG] = PCF50606_REG_LPREGC1, + [PCF50606_REGULATOR_IOREG] = PCF50606_REG_IOREGC, +}; + +static uint8_t dcudc_voltage(unsigned int millivolts) +{ + if (millivolts <= 900) + return 0; + else if (millivolts <= 3300) + return (millivolts - 900) / 300; + else if (millivolts < 4000) + return 0x0f; + else if (millivolts <= 5500) + return (millivolts - 4000) / 100; + + return 0x1f; +} + +static unsigned int dcudc_2voltage(uint8_t bits) +{ + bits &= 0x1f; + if (bits < 0x08) + return 900 + bits * 300; + else if (bits < 0x10) + return 3300; + else + return 4000 + (bits & 0xf) * 100; +} + +static uint8_t dcdec_voltage(unsigned int millivolts) +{ + if (millivolts < 900) + return 0; + else if (millivolts > 3300) + return 0x0f; + + return (millivolts - 900) / 300; +} + +static unsigned int dcdec_2voltage(uint8_t bits) +{ + bits &= 0x0f; + return 900 + bits * 300; +} + +static uint8_t dcdc_voltage(unsigned int millivolts) +{ + if (millivolts < 900) + return 0; + else if (millivolts > 3600) + return 0x1f; + + if (millivolts < 1500) + return (millivolts - 900) / 25; + else + return 0x18 + (millivolts - 1500) / 300; +} + +static unsigned int dcdc_2voltage(uint8_t bits) +{ + bits &= 0x1f; + if ((bits & 0x18) == 0x18) + return 1500 + ((bits & 0x7) * 300); + else + return 900 + (bits * 25); +} + +static uint8_t dx_voltage(unsigned int millivolts) +{ + if (millivolts < 900) + return 0; + else if (millivolts > 3300) + return 0x18; + + return (millivolts - 900) / 100; +} + +static unsigned int dx_2voltage(uint8_t bits) +{ + bits &= 0x1f; + return 900 + (bits * 100); +} + +static int pcf50606_regulator_set_voltage(struct regulator_dev *rdev, + int min_uV, int max_uV) +{ + struct pcf50606 *pcf; + int regulator_id, millivolts; + uint8_t volt_bits, regnr; + + pcf = rdev_get_drvdata(rdev); + + regulator_id = rdev_get_id(rdev); + + millivolts = min_uV / 1000; + + switch (regulator_id) { + case PCF50606_REGULATOR_DCD: + volt_bits = dcdc_voltage(millivolts); + regnr = PCF50606_REG_DCDC1; + break; + case PCF50606_REGULATOR_DCDE: + volt_bits = dcdec_voltage(millivolts); + regnr = PCF50606_REG_DCDEC1; + break; + case PCF50606_REGULATOR_DCUD: + volt_bits = dcudc_voltage(millivolts); + regnr = PCF50606_REG_DCUDC1; + break; + case PCF50606_REGULATOR_D1REG: + case PCF50606_REGULATOR_D2REG: + case PCF50606_REGULATOR_D3REG: + regnr = PCF50606_REG_D1REGC1 + + (regulator_id - PCF50606_REGULATOR_D1REG); + volt_bits = dx_voltage(millivolts); + break; + case PCF50606_REGULATOR_LPREG: + volt_bits = dx_voltage(millivolts); + regnr = PCF50606_REG_LPREGC1; + break; + case PCF50606_REGULATOR_IOREG: + if (millivolts < 1800) + return -EINVAL; + volt_bits = dx_voltage(millivolts); + regnr = PCF50606_REG_IOREGC; + break; + default: + return -EINVAL; + } + + return pcf50606_reg_set_bit_mask(pcf, regnr, 0x1f, volt_bits); +} + +static int pcf50606_regulator_get_voltage(struct regulator_dev *rdev) +{ + struct pcf50606 *pcf; + uint8_t volt_bits, regnr; + int regulator_id; + int voltage; + + pcf = rdev_get_drvdata(rdev); + + regulator_id = rdev_get_id(rdev); + + switch (regulator_id) { + case PCF50606_REGULATOR_DCD: + volt_bits = pcf50606_reg_read(pcf, PCF50606_REG_DCDC1) & 0x1f; + voltage = dcdc_2voltage(volt_bits); + break; + case PCF50606_REGULATOR_DCDE: + volt_bits = pcf50606_reg_read(pcf, PCF50606_REG_DCDEC1) & 0x0f; + voltage = dcdec_2voltage(volt_bits); + break; + case PCF50606_REGULATOR_DCUD: + volt_bits = pcf50606_reg_read(pcf, PCF50606_REG_DCUDC1) & 0x1f; + voltage = dcudc_2voltage(volt_bits); + break; + case PCF50606_REGULATOR_D1REG: + case PCF50606_REGULATOR_D2REG: + case PCF50606_REGULATOR_D3REG: + regnr = PCF50606_REG_D1REGC1 + (regulator_id - PCF50606_REGULATOR_D1REG); + volt_bits = pcf50606_reg_read(pcf, regnr) & 0x1f; + if (volt_bits > 0x18) + volt_bits = 0x18; + voltage = dx_2voltage(volt_bits); + break; + case PCF50606_REGULATOR_LPREG: + volt_bits = pcf50606_reg_read(pcf, PCF50606_REG_LPREGC1) & 0x1f; + if (volt_bits > 0x18) + volt_bits = 0x18; + voltage = dx_2voltage(volt_bits); + break; + case PCF50606_REGULATOR_IOREG: + volt_bits = pcf50606_reg_read(pcf, PCF50606_REG_IOREGC) & 0x1f; + if (volt_bits > 0x18) + volt_bits = 0x18; + voltage = dx_2voltage(volt_bits); + break; + default: + return -EINVAL; + } + + return voltage * 1000; +} + +static int pcf50606_regulator_enable(struct regulator_dev *rdev) +{ + struct pcf50606 *pcf = rdev_get_drvdata(rdev); + int regulator_id; + uint8_t regnr; + + regulator_id = rdev_get_id(rdev); + + regnr = pcf50606_regulator_registers[regulator_id]; + + return pcf50606_reg_set_bit_mask(pcf, regnr, 0xe0, 0xe0); +} + +static int pcf50606_regulator_disable(struct regulator_dev *rdev) +{ + struct pcf50606 *pcf = rdev_get_drvdata(rdev); + int regulator_id; + uint8_t regnr; + + regulator_id = rdev_get_id(rdev); + + /* IOREG cannot be powered off since it powers the PMU I2C */ + if (regulator_id == PCF50606_REGULATOR_IOREG) + return -EINVAL; + + regnr = pcf50606_regulator_registers[regulator_id]; + + return pcf50606_reg_set_bit_mask(pcf, regnr, 0xe0, 0); +} + +static int pcf50606_regulator_is_enabled(struct regulator_dev *rdev) +{ + struct pcf50606 *pcf = rdev_get_drvdata(rdev); + int regulator_id = rdev_get_id(rdev); + uint8_t regnr, val; + + regulator_id = rdev_get_id(rdev); + + /* the *ENA register is always one after the *OUT register */ + regnr = pcf50606_regulator_registers[regulator_id]; + val = (pcf50606_reg_read(pcf, regnr) & 0xe0) >> 5; + + /* PWREN1 = 1, PWREN2 = 1, see table 16 of datasheet */ + if (val == 0 || val == 5) + return 0; + + return 1; +} + +static struct regulator_ops pcf50606_regulator_ops = { + .set_voltage = pcf50606_regulator_set_voltage, + .get_voltage = pcf50606_regulator_get_voltage, + .enable = pcf50606_regulator_enable, + .disable = pcf50606_regulator_disable, + .is_enabled = pcf50606_regulator_is_enabled, +}; + +static struct regulator_desc regulators[] = { + [PCF50606_REGULATOR_DCD] = + PCF50606_REGULATOR("dcd", PCF50606_REGULATOR_DCD), + [PCF50606_REGULATOR_DCDE] = + PCF50606_REGULATOR("dcde", PCF50606_REGULATOR_DCDE), + [PCF50606_REGULATOR_DCUD] = + PCF50606_REGULATOR("dcud", PCF50606_REGULATOR_DCUD), + [PCF50606_REGULATOR_D1REG] = + PCF50606_REGULATOR("d1reg", PCF50606_REGULATOR_D1REG), + [PCF50606_REGULATOR_D2REG] = + PCF50606_REGULATOR("d2reg", PCF50606_REGULATOR_D2REG), + [PCF50606_REGULATOR_D3REG] = + PCF50606_REGULATOR("d3reg", PCF50606_REGULATOR_D3REG), + [PCF50606_REGULATOR_LPREG] = + PCF50606_REGULATOR("lpreg", PCF50606_REGULATOR_LPREG), + [PCF50606_REGULATOR_IOREG] = + PCF50606_REGULATOR("ioreg", PCF50606_REGULATOR_IOREG), +}; + +static int __devinit pcf50606_regulator_probe(struct platform_device *pdev) +{ + struct regulator_dev *rdev; + struct pcf50606 *pcf; + + pcf = dev_to_pcf50606(pdev->dev.parent); + + rdev = regulator_register(®ulators[pdev->id], &pdev->dev, + pdev->dev.platform_data, pcf); + if (IS_ERR(rdev)) + return PTR_ERR(rdev); + + platform_set_drvdata(pdev, rdev); + + if (pcf->pdata->regulator_registered) + pcf->pdata->regulator_registered(pcf, pdev->id); + + return 0; +} + +static int __devexit pcf50606_regulator_remove(struct platform_device *pdev) +{ + struct regulator_dev *rdev = platform_get_drvdata(pdev); + + platform_set_drvdata(pdev, NULL); + regulator_unregister(rdev); + + return 0; +} + +static struct platform_driver pcf50606_regulator_driver = { + .driver = { + .name = "pcf50606-regltr", + .owner = THIS_MODULE, + }, + .probe = pcf50606_regulator_probe, + .remove = __devexit_p(pcf50606_regulator_remove), +}; + +static int __init pcf50606_regulator_init(void) +{ + return platform_driver_register(&pcf50606_regulator_driver); +} +module_init(pcf50606_regulator_init); + +static void __exit pcf50606_regulator_exit(void) +{ + platform_driver_unregister(&pcf50606_regulator_driver); +} +module_exit(pcf50606_regulator_exit); + +MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>"); +MODULE_DESCRIPTION("PCF50606 regulator driver"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:pcf50606-regulator"); |