| /* |
| * Copyright (C) ST-Ericsson SA 2010 |
| * |
| * License Terms: GNU General Public License v2 |
| * |
| * Author: Sundar Iyer <sundar.iyer@stericsson.com> for ST-Ericsson |
| * |
| * AB8500 peripheral regulators |
| * |
| * AB8500 supports the following regulators, |
| * LDOs - VAUDIO, VANAMIC2/2, VDIGMIC, VINTCORE12, VTVOUT, |
| * VAUX1/2/3, VANA |
| * |
| * for DB8500 cut 1.0 and previous versions of the silicon, all accesses |
| * to registers are through the DB8500 SPI. In cut 1.1 onwards, these |
| * accesses are through the DB8500 PRCMU I2C |
| * |
| */ |
| #include <linux/init.h> |
| #include <linux/kernel.h> |
| #include <linux/err.h> |
| #include <linux/platform_device.h> |
| #include <linux/mfd/ab8500.h> |
| #include <linux/regulator/driver.h> |
| #include <linux/regulator/machine.h> |
| #include <linux/regulator/ab8500.h> |
| |
| /** |
| * struct ab8500_regulator_info - ab8500 regulator information |
| * @desc: regulator description |
| * @ab8500: ab8500 parent |
| * @regulator_dev: regulator device |
| * @max_uV: maximum voltage (for variable voltage supplies) |
| * @min_uV: minimum voltage (for variable voltage supplies) |
| * @fixed_uV: typical voltage (for fixed voltage supplies) |
| * @update_reg: register to control on/off |
| * @mask: mask to enable/disable regulator |
| * @enable: bits to enable the regulator in normal(high power) mode |
| * @voltage_reg: register to control regulator voltage |
| * @voltage_mask: mask to control regulator voltage |
| * @supported_voltages: supported voltage table |
| * @voltages_len: number of supported voltages for the regulator |
| */ |
| struct ab8500_regulator_info { |
| struct device *dev; |
| struct regulator_desc desc; |
| struct ab8500 *ab8500; |
| struct regulator_dev *regulator; |
| int max_uV; |
| int min_uV; |
| int fixed_uV; |
| int update_reg; |
| int mask; |
| int enable; |
| int voltage_reg; |
| int voltage_mask; |
| int const *supported_voltages; |
| int voltages_len; |
| }; |
| |
| /* voltage tables for the vauxn/vintcore supplies */ |
| static const int ldo_vauxn_voltages[] = { |
| 1100000, |
| 1200000, |
| 1300000, |
| 1400000, |
| 1500000, |
| 1800000, |
| 1850000, |
| 1900000, |
| 2500000, |
| 2650000, |
| 2700000, |
| 2750000, |
| 2800000, |
| 2900000, |
| 3000000, |
| 3300000, |
| }; |
| |
| static const int ldo_vintcore_voltages[] = { |
| 1200000, |
| 1225000, |
| 1250000, |
| 1275000, |
| 1300000, |
| 1325000, |
| 1350000, |
| }; |
| |
| static int ab8500_regulator_enable(struct regulator_dev *rdev) |
| { |
| int regulator_id, ret; |
| struct ab8500_regulator_info *info = rdev_get_drvdata(rdev); |
| |
| regulator_id = rdev_get_id(rdev); |
| if (regulator_id >= AB8500_NUM_REGULATORS) |
| return -EINVAL; |
| |
| ret = ab8500_set_bits(info->ab8500, info->update_reg, |
| info->mask, info->enable); |
| if (ret < 0) |
| dev_err(rdev_get_dev(rdev), |
| "couldn't set enable bits for regulator\n"); |
| return ret; |
| } |
| |
| static int ab8500_regulator_disable(struct regulator_dev *rdev) |
| { |
| int regulator_id, ret; |
| struct ab8500_regulator_info *info = rdev_get_drvdata(rdev); |
| |
| regulator_id = rdev_get_id(rdev); |
| if (regulator_id >= AB8500_NUM_REGULATORS) |
| return -EINVAL; |
| |
| ret = ab8500_set_bits(info->ab8500, info->update_reg, |
| info->mask, 0x0); |
| if (ret < 0) |
| dev_err(rdev_get_dev(rdev), |
| "couldn't set disable bits for regulator\n"); |
| return ret; |
| } |
| |
| static int ab8500_regulator_is_enabled(struct regulator_dev *rdev) |
| { |
| int regulator_id, ret; |
| struct ab8500_regulator_info *info = rdev_get_drvdata(rdev); |
| |
| regulator_id = rdev_get_id(rdev); |
| if (regulator_id >= AB8500_NUM_REGULATORS) |
| return -EINVAL; |
| |
| ret = ab8500_read(info->ab8500, info->update_reg); |
| if (ret < 0) { |
| dev_err(rdev_get_dev(rdev), |
| "couldn't read 0x%x register\n", info->update_reg); |
| return ret; |
| } |
| |
| if (ret & info->mask) |
| return true; |
| else |
| return false; |
| } |
| |
| static int ab8500_list_voltage(struct regulator_dev *rdev, unsigned selector) |
| { |
| int regulator_id; |
| struct ab8500_regulator_info *info = rdev_get_drvdata(rdev); |
| |
| regulator_id = rdev_get_id(rdev); |
| if (regulator_id >= AB8500_NUM_REGULATORS) |
| return -EINVAL; |
| |
| /* return the uV for the fixed regulators */ |
| if (info->fixed_uV) |
| return info->fixed_uV; |
| |
| if (selector >= info->voltages_len) |
| return -EINVAL; |
| |
| return info->supported_voltages[selector]; |
| } |
| |
| static int ab8500_regulator_get_voltage(struct regulator_dev *rdev) |
| { |
| int regulator_id, ret, val; |
| struct ab8500_regulator_info *info = rdev_get_drvdata(rdev); |
| |
| regulator_id = rdev_get_id(rdev); |
| if (regulator_id >= AB8500_NUM_REGULATORS) |
| return -EINVAL; |
| |
| ret = ab8500_read(info->ab8500, info->voltage_reg); |
| if (ret < 0) { |
| dev_err(rdev_get_dev(rdev), |
| "couldn't read voltage reg for regulator\n"); |
| return ret; |
| } |
| |
| /* vintcore has a different layout */ |
| val = ret & info->voltage_mask; |
| if (regulator_id == AB8500_LDO_INTCORE) |
| ret = info->supported_voltages[val >> 0x3]; |
| else |
| ret = info->supported_voltages[val]; |
| |
| return ret; |
| } |
| |
| static int ab8500_get_best_voltage_index(struct regulator_dev *rdev, |
| int min_uV, int max_uV) |
| { |
| struct ab8500_regulator_info *info = rdev_get_drvdata(rdev); |
| int i; |
| |
| /* check the supported voltage */ |
| for (i = 0; i < info->voltages_len; i++) { |
| if ((info->supported_voltages[i] >= min_uV) && |
| (info->supported_voltages[i] <= max_uV)) |
| return i; |
| } |
| |
| return -EINVAL; |
| } |
| |
| static int ab8500_regulator_set_voltage(struct regulator_dev *rdev, |
| int min_uV, int max_uV) |
| { |
| int regulator_id, ret; |
| struct ab8500_regulator_info *info = rdev_get_drvdata(rdev); |
| |
| regulator_id = rdev_get_id(rdev); |
| if (regulator_id >= AB8500_NUM_REGULATORS) |
| return -EINVAL; |
| |
| /* get the appropriate voltages within the range */ |
| ret = ab8500_get_best_voltage_index(rdev, min_uV, max_uV); |
| if (ret < 0) { |
| dev_err(rdev_get_dev(rdev), |
| "couldn't get best voltage for regulator\n"); |
| return ret; |
| } |
| |
| /* set the registers for the request */ |
| ret = ab8500_set_bits(info->ab8500, info->voltage_reg, |
| info->voltage_mask, ret); |
| if (ret < 0) |
| dev_err(rdev_get_dev(rdev), |
| "couldn't set voltage reg for regulator\n"); |
| |
| return ret; |
| } |
| |
| static struct regulator_ops ab8500_regulator_ops = { |
| .enable = ab8500_regulator_enable, |
| .disable = ab8500_regulator_disable, |
| .is_enabled = ab8500_regulator_is_enabled, |
| .get_voltage = ab8500_regulator_get_voltage, |
| .set_voltage = ab8500_regulator_set_voltage, |
| .list_voltage = ab8500_list_voltage, |
| }; |
| |
| static int ab8500_fixed_get_voltage(struct regulator_dev *rdev) |
| { |
| int regulator_id; |
| struct ab8500_regulator_info *info = rdev_get_drvdata(rdev); |
| |
| regulator_id = rdev_get_id(rdev); |
| if (regulator_id >= AB8500_NUM_REGULATORS) |
| return -EINVAL; |
| |
| return info->fixed_uV; |
| } |
| |
| static struct regulator_ops ab8500_ldo_fixed_ops = { |
| .enable = ab8500_regulator_enable, |
| .disable = ab8500_regulator_disable, |
| .is_enabled = ab8500_regulator_is_enabled, |
| .get_voltage = ab8500_fixed_get_voltage, |
| .list_voltage = ab8500_list_voltage, |
| }; |
| |
| #define AB8500_LDO(_id, min, max, reg, reg_mask, reg_enable, \ |
| volt_reg, volt_mask, voltages, \ |
| len_volts) \ |
| { \ |
| .desc = { \ |
| .name = "LDO-" #_id, \ |
| .ops = &ab8500_regulator_ops, \ |
| .type = REGULATOR_VOLTAGE, \ |
| .id = AB8500_LDO_##_id, \ |
| .owner = THIS_MODULE, \ |
| }, \ |
| .min_uV = (min) * 1000, \ |
| .max_uV = (max) * 1000, \ |
| .update_reg = reg, \ |
| .mask = reg_mask, \ |
| .enable = reg_enable, \ |
| .voltage_reg = volt_reg, \ |
| .voltage_mask = volt_mask, \ |
| .supported_voltages = voltages, \ |
| .voltages_len = len_volts, \ |
| .fixed_uV = 0, \ |
| } |
| |
| #define AB8500_FIXED_LDO(_id, fixed, reg, reg_mask, \ |
| reg_enable) \ |
| { \ |
| .desc = { \ |
| .name = "LDO-" #_id, \ |
| .ops = &ab8500_ldo_fixed_ops, \ |
| .type = REGULATOR_VOLTAGE, \ |
| .id = AB8500_LDO_##_id, \ |
| .owner = THIS_MODULE, \ |
| }, \ |
| .fixed_uV = fixed * 1000, \ |
| .update_reg = reg, \ |
| .mask = reg_mask, \ |
| .enable = reg_enable, \ |
| } |
| |
| static struct ab8500_regulator_info ab8500_regulator_info[] = { |
| /* |
| * Variable Voltage LDOs |
| * name, min uV, max uV, ctrl reg, reg mask, enable mask, |
| * volt ctrl reg, volt ctrl mask, volt table, num supported volts |
| */ |
| AB8500_LDO(AUX1, 1100, 3300, 0x0409, 0x3, 0x1, 0x041f, 0xf, |
| ldo_vauxn_voltages, ARRAY_SIZE(ldo_vauxn_voltages)), |
| AB8500_LDO(AUX2, 1100, 3300, 0x0409, 0xc, 0x4, 0x0420, 0xf, |
| ldo_vauxn_voltages, ARRAY_SIZE(ldo_vauxn_voltages)), |
| AB8500_LDO(AUX3, 1100, 3300, 0x040a, 0x3, 0x1, 0x0421, 0xf, |
| ldo_vauxn_voltages, ARRAY_SIZE(ldo_vauxn_voltages)), |
| AB8500_LDO(INTCORE, 1100, 3300, 0x0380, 0x4, 0x4, 0x0380, 0x38, |
| ldo_vintcore_voltages, ARRAY_SIZE(ldo_vintcore_voltages)), |
| |
| /* |
| * Fixed Voltage LDOs |
| * name, o/p uV, ctrl reg, enable, disable |
| */ |
| AB8500_FIXED_LDO(TVOUT, 2000, 0x0380, 0x2, 0x2), |
| AB8500_FIXED_LDO(AUDIO, 2000, 0x0383, 0x2, 0x2), |
| AB8500_FIXED_LDO(ANAMIC1, 2050, 0x0383, 0x4, 0x4), |
| AB8500_FIXED_LDO(ANAMIC2, 2050, 0x0383, 0x8, 0x8), |
| AB8500_FIXED_LDO(DMIC, 1800, 0x0383, 0x10, 0x10), |
| AB8500_FIXED_LDO(ANA, 1200, 0x0383, 0xc, 0x4), |
| }; |
| |
| static inline struct ab8500_regulator_info *find_regulator_info(int id) |
| { |
| struct ab8500_regulator_info *info; |
| int i; |
| |
| for (i = 0; i < ARRAY_SIZE(ab8500_regulator_info); i++) { |
| info = &ab8500_regulator_info[i]; |
| if (info->desc.id == id) |
| return info; |
| } |
| return NULL; |
| } |
| |
| static __devinit int ab8500_regulator_probe(struct platform_device *pdev) |
| { |
| struct ab8500 *ab8500 = dev_get_drvdata(pdev->dev.parent); |
| struct ab8500_platform_data *pdata; |
| int i, err; |
| |
| if (!ab8500) { |
| dev_err(&pdev->dev, "null mfd parent\n"); |
| return -EINVAL; |
| } |
| pdata = dev_get_platdata(ab8500->dev); |
| |
| /* register all regulators */ |
| for (i = 0; i < ARRAY_SIZE(ab8500_regulator_info); i++) { |
| struct ab8500_regulator_info *info = NULL; |
| |
| /* assign per-regulator data */ |
| info = &ab8500_regulator_info[i]; |
| info->dev = &pdev->dev; |
| info->ab8500 = ab8500; |
| |
| info->regulator = regulator_register(&info->desc, &pdev->dev, |
| pdata->regulator[i], info); |
| if (IS_ERR(info->regulator)) { |
| err = PTR_ERR(info->regulator); |
| dev_err(&pdev->dev, "failed to register regulator %s\n", |
| info->desc.name); |
| /* when we fail, un-register all earlier regulators */ |
| while (--i >= 0) { |
| info = &ab8500_regulator_info[i]; |
| regulator_unregister(info->regulator); |
| } |
| return err; |
| } |
| } |
| |
| return 0; |
| } |
| |
| static __devexit int ab8500_regulator_remove(struct platform_device *pdev) |
| { |
| int i; |
| |
| for (i = 0; i < ARRAY_SIZE(ab8500_regulator_info); i++) { |
| struct ab8500_regulator_info *info = NULL; |
| info = &ab8500_regulator_info[i]; |
| regulator_unregister(info->regulator); |
| } |
| |
| return 0; |
| } |
| |
| static struct platform_driver ab8500_regulator_driver = { |
| .probe = ab8500_regulator_probe, |
| .remove = __devexit_p(ab8500_regulator_remove), |
| .driver = { |
| .name = "ab8500-regulator", |
| .owner = THIS_MODULE, |
| }, |
| }; |
| |
| static int __init ab8500_regulator_init(void) |
| { |
| int ret; |
| |
| ret = platform_driver_register(&ab8500_regulator_driver); |
| if (ret != 0) |
| pr_err("Failed to register ab8500 regulator: %d\n", ret); |
| |
| return ret; |
| } |
| subsys_initcall(ab8500_regulator_init); |
| |
| static void __exit ab8500_regulator_exit(void) |
| { |
| platform_driver_unregister(&ab8500_regulator_driver); |
| } |
| module_exit(ab8500_regulator_exit); |
| |
| MODULE_LICENSE("GPL v2"); |
| MODULE_AUTHOR("Sundar Iyer <sundar.iyer@stericsson.com>"); |
| MODULE_DESCRIPTION("Regulator Driver for ST-Ericsson AB8500 Mixed-Sig PMIC"); |
| MODULE_ALIAS("platform:ab8500-regulator"); |