/* * max8998.c - Voltage regulator driver for the Maxim 8998 * * Copyright (C) 2009-2010 Samsung Electronics * Kyungmin Park <kyungmin.park@samsung.com> * Marek Szyprowski <m.szyprowski@samsung.com> * * 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 <linux/module.h> #include <linux/init.h> #include <linux/i2c.h> #include <linux/err.h> #include <linux/gpio.h> #include <linux/slab.h> #include <linux/interrupt.h> #include <linux/mutex.h> #include <linux/delay.h> #include <linux/platform_device.h> #include <linux/regulator/driver.h> #include <linux/mfd/max8998.h> #include <linux/mfd/max8998-private.h> struct max8998_data { struct device *dev; struct max8998_dev *iodev; int num_regulators; struct regulator_dev **rdev; }; struct voltage_map_desc { int min; int max; int step; }; /* Voltage maps */ static const struct voltage_map_desc ldo23_voltage_map_desc = { .min = 800, .step = 50, .max = 1300, }; static const struct voltage_map_desc ldo456711_voltage_map_desc = { .min = 1600, .step = 100, .max = 3600, }; static const struct voltage_map_desc ldo8_voltage_map_desc = { .min = 3000, .step = 100, .max = 3600, }; static const struct voltage_map_desc ldo9_voltage_map_desc = { .min = 2800, .step = 100, .max = 3100, }; static const struct voltage_map_desc ldo10_voltage_map_desc = { .min = 950, .step = 50, .max = 1300, }; static const struct voltage_map_desc ldo1213_voltage_map_desc = { .min = 800, .step = 100, .max = 3300, }; static const struct voltage_map_desc ldo1415_voltage_map_desc = { .min = 1200, .step = 100, .max = 3300, }; static const struct voltage_map_desc ldo1617_voltage_map_desc = { .min = 1600, .step = 100, .max = 3600, }; static const struct voltage_map_desc buck12_voltage_map_desc = { .min = 750, .step = 25, .max = 1525, }; static const struct voltage_map_desc buck3_voltage_map_desc = { .min = 1600, .step = 100, .max = 3600, }; static const struct voltage_map_desc buck4_voltage_map_desc = { .min = 800, .step = 100, .max = 2300, }; static const struct voltage_map_desc *ldo_voltage_map[] = { NULL, NULL, &ldo23_voltage_map_desc, /* LDO2 */ &ldo23_voltage_map_desc, /* LDO3 */ &ldo456711_voltage_map_desc, /* LDO4 */ &ldo456711_voltage_map_desc, /* LDO5 */ &ldo456711_voltage_map_desc, /* LDO6 */ &ldo456711_voltage_map_desc, /* LDO7 */ &ldo8_voltage_map_desc, /* LDO8 */ &ldo9_voltage_map_desc, /* LDO9 */ &ldo10_voltage_map_desc, /* LDO10 */ &ldo456711_voltage_map_desc, /* LDO11 */ &ldo1213_voltage_map_desc, /* LDO12 */ &ldo1213_voltage_map_desc, /* LDO13 */ &ldo1415_voltage_map_desc, /* LDO14 */ &ldo1415_voltage_map_desc, /* LDO15 */ &ldo1617_voltage_map_desc, /* LDO16 */ &ldo1617_voltage_map_desc, /* LDO17 */ &buck12_voltage_map_desc, /* BUCK1 */ &buck12_voltage_map_desc, /* BUCK2 */ &buck3_voltage_map_desc, /* BUCK3 */ &buck4_voltage_map_desc, /* BUCK4 */ }; static inline int max8998_get_ldo(struct regulator_dev *rdev) { return rdev_get_id(rdev); } static int max8998_list_voltage(struct regulator_dev *rdev, unsigned int selector) { const struct voltage_map_desc *desc; int ldo = max8998_get_ldo(rdev); int val; if (ldo >= ARRAY_SIZE(ldo_voltage_map)) return -EINVAL; desc = ldo_voltage_map[ldo]; if (desc == NULL) return -EINVAL; val = desc->min + desc->step * selector; if (val > desc->max) return -EINVAL; return val * 1000; } static int max8998_get_enable_register(struct regulator_dev *rdev, int *reg, int *shift) { int ldo = max8998_get_ldo(rdev); switch (ldo) { case MAX8998_LDO2 ... MAX8998_LDO5: *reg = MAX8998_REG_ONOFF1; *shift = 3 - (ldo - MAX8998_LDO2); break; case MAX8998_LDO6 ... MAX8998_LDO13: *reg = MAX8998_REG_ONOFF2; *shift = 7 - (ldo - MAX8998_LDO6); break; case MAX8998_LDO14 ... MAX8998_LDO17: *reg = MAX8998_REG_ONOFF3; *shift = 7 - (ldo - MAX8998_LDO14); break; case MAX8998_BUCK1 ... MAX8998_BUCK4: *reg = MAX8998_REG_ONOFF1; *shift = 7 - (ldo - MAX8998_BUCK1); break; case MAX8998_EN32KHZ_AP ... MAX8998_ENVICHG: *reg = MAX8998_REG_ONOFF4; *shift = 7 - (ldo - MAX8998_EN32KHZ_AP); break; case MAX8998_ESAFEOUT1 ... MAX8998_ESAFEOUT2: *reg = MAX8998_REG_CHGR2; *shift = 7 - (ldo - MAX8998_ESAFEOUT1); break; default: return -EINVAL; } return 0; } static int max8998_ldo_is_enabled(struct regulator_dev *rdev) { struct max8998_data *max8998 = rdev_get_drvdata(rdev); int ret, reg, shift = 8; u8 val; ret = max8998_get_enable_register(rdev, ®, &shift); if (ret) return ret; ret = max8998_read_reg(max8998->iodev, reg, &val); if (ret) return ret; return val & (1 << shift); } static int max8998_ldo_enable(struct regulator_dev *rdev) { struct max8998_data *max8998 = rdev_get_drvdata(rdev); int reg, shift = 8, ret; ret = max8998_get_enable_register(rdev, ®, &shift); if (ret) return ret; return max8998_update_reg(max8998->iodev, reg, 1<<shift, 1<<shift); } static int max8998_ldo_disable(struct regulator_dev *rdev) { struct max8998_data *max8998 = rdev_get_drvdata(rdev); int reg, shift = 8, ret; ret = max8998_get_enable_register(rdev, ®, &shift); if (ret) return ret; return max8998_update_reg(max8998->iodev, reg, 0, 1<<shift); } static int max8998_get_voltage_register(struct regulator_dev *rdev, int *_reg, int *_shift, int *_mask) { int ldo = max8998_get_ldo(rdev); int reg, shift = 0, mask = 0xff; switch (ldo) { case MAX8998_LDO2 ... MAX8998_LDO3: reg = MAX8998_REG_LDO2_LDO3; mask = 0xf; if (ldo == MAX8998_LDO2) shift = 4; else shift = 0; break; case MAX8998_LDO4 ... MAX8998_LDO7: reg = MAX8998_REG_LDO4 + (ldo - MAX8998_LDO4); break; case MAX8998_LDO8 ... MAX8998_LDO9: reg = MAX8998_REG_LDO8_LDO9; mask = 0xf; if (ldo == MAX8998_LDO8) shift = 4; else shift = 0; break; case MAX8998_LDO10 ... MAX8998_LDO11: reg = MAX8998_REG_LDO10_LDO11; if (ldo == MAX8998_LDO10) { shift = 5; mask = 0x7; } else { shift = 0; mask = 0x1f; } break; case MAX8998_LDO12 ... MAX8998_LDO17: reg = MAX8998_REG_LDO12 + (ldo - MAX8998_LDO12); break; case MAX8998_BUCK1: reg = MAX8998_REG_BUCK1_DVSARM1; break; case MAX8998_BUCK2: reg = MAX8998_REG_BUCK2_DVSINT1; break; case MAX8998_BUCK3: reg = MAX8998_REG_BUCK3; break; case MAX8998_BUCK4: reg = MAX8998_REG_BUCK4; break; default: return -EINVAL; } *_reg = reg; *_shift = shift; *_mask = mask; return 0; } static int max8998_get_voltage(struct regulator_dev *rdev) { struct max8998_data *max8998 = rdev_get_drvdata(rdev); int reg, shift = 0, mask, ret; u8 val; ret = max8998_get_voltage_register(rdev, ®, &shift, &mask); if (ret) return ret; ret = max8998_read_reg(max8998->iodev, reg, &val); if (ret) return ret; val >>= shift; val &= mask; return max8998_list_voltage(rdev, val); } static int max8998_set_voltage(struct regulator_dev *rdev, int min_uV, int max_uV) { struct max8998_data *max8998 = rdev_get_drvdata(rdev); int min_vol = min_uV / 1000, max_vol = max_uV / 1000; int previous_vol = 0; const struct voltage_map_desc *desc; int ldo = max8998_get_ldo(rdev); int reg, shift = 0, mask, ret; int i = 0; u8 val; bool en_ramp = false; if (ldo >= ARRAY_SIZE(ldo_voltage_map)) return -EINVAL; desc = ldo_voltage_map[ldo]; if (desc == NULL) return -EINVAL; if (max_vol < desc->min || min_vol > desc->max) return -EINVAL; while (desc->min + desc->step*i < min_vol && desc->min + desc->step*i < desc->max) i++; if (desc->min + desc->step*i > max_vol) return -EINVAL; ret = max8998_get_voltage_register(rdev, ®, &shift, &mask); if (ret) return ret; /* wait for RAMP_UP_DELAY if rdev is BUCK1/2 and * ENRAMP is ON */ if (ldo == MAX8998_BUCK1 || ldo == MAX8998_BUCK2) { max8998_read_reg(max8998->iodev, MAX8998_REG_ONOFF4, &val); if (val & (1 << 4)) { en_ramp = true; previous_vol = max8998_get_voltage(rdev); } } ret = max8998_update_reg(max8998->iodev, reg, i<<shift, mask<<shift); if (en_ramp == true) { int difference = desc->min + desc->step*i - previous_vol/1000; if (difference > 0) udelay(difference / ((val & 0x0f) + 1)); } return ret; } static struct regulator_ops max8998_ldo_ops = { .list_voltage = max8998_list_voltage, .is_enabled = max8998_ldo_is_enabled, .enable = max8998_ldo_enable, .disable = max8998_ldo_disable, .get_voltage = max8998_get_voltage, .set_voltage = max8998_set_voltage, .set_suspend_enable = max8998_ldo_enable, .set_suspend_disable = max8998_ldo_disable, }; static struct regulator_ops max8998_buck_ops = { .list_voltage = max8998_list_voltage, .is_enabled = max8998_ldo_is_enabled, .enable = max8998_ldo_enable, .disable = max8998_ldo_disable, .get_voltage = max8998_get_voltage, .set_voltage = max8998_set_voltage, .set_suspend_enable = max8998_ldo_enable, .set_suspend_disable = max8998_ldo_disable, }; static struct regulator_ops max8998_others_ops = { .is_enabled = max8998_ldo_is_enabled, .enable = max8998_ldo_enable, .disable = max8998_ldo_disable, .set_suspend_enable = max8998_ldo_enable, .set_suspend_disable = max8998_ldo_disable, }; static struct regulator_desc regulators[] = { { .name = "LDO2", .id = MAX8998_LDO2, .ops = &max8998_ldo_ops, .type = REGULATOR_VOLTAGE, .owner = THIS_MODULE, }, { .name = "LDO3", .id = MAX8998_LDO3, .ops = &max8998_ldo_ops, .type = REGULATOR_VOLTAGE, .owner = THIS_MODULE, }, { .name = "LDO4", .id = MAX8998_LDO4, .ops = &max8998_ldo_ops, .type = REGULATOR_VOLTAGE, .owner = THIS_MODULE, }, { .name = "LDO5", .id = MAX8998_LDO5, .ops = &max8998_ldo_ops, .type = REGULATOR_VOLTAGE, .owner = THIS_MODULE, }, { .name = "LDO6", .id = MAX8998_LDO6, .ops = &max8998_ldo_ops, .type = REGULATOR_VOLTAGE, .owner = THIS_MODULE, }, { .name = "LDO7", .id = MAX8998_LDO7, .ops = &max8998_ldo_ops, .type = REGULATOR_VOLTAGE, .owner = THIS_MODULE, }, { .name = "LDO8", .id = MAX8998_LDO8, .ops = &max8998_ldo_ops, .type = REGULATOR_VOLTAGE, .owner = THIS_MODULE, }, { .name = "LDO9", .id = MAX8998_LDO9, .ops = &max8998_ldo_ops, .type = REGULATOR_VOLTAGE, .owner = THIS_MODULE, }, { .name = "LDO10", .id = MAX8998_LDO10, .ops = &max8998_ldo_ops, .type = REGULATOR_VOLTAGE, .owner = THIS_MODULE, }, { .name = "LDO11", .id = MAX8998_LDO11, .ops = &max8998_ldo_ops, .type = REGULATOR_VOLTAGE, .owner = THIS_MODULE, }, { .name = "LDO12", .id = MAX8998_LDO12, .ops = &max8998_ldo_ops, .type = REGULATOR_VOLTAGE, .owner = THIS_MODULE, }, { .name = "LDO13", .id = MAX8998_LDO13, .ops = &max8998_ldo_ops, .type = REGULATOR_VOLTAGE, .owner = THIS_MODULE, }, { .name = "LDO14", .id = MAX8998_LDO14, .ops = &max8998_ldo_ops, .type = REGULATOR_VOLTAGE, .owner = THIS_MODULE, }, { .name = "LDO15", .id = MAX8998_LDO15, .ops = &max8998_ldo_ops, .type = REGULATOR_VOLTAGE, .owner = THIS_MODULE, }, { .name = "LDO16", .id = MAX8998_LDO16, .ops = &max8998_ldo_ops, .type = REGULATOR_VOLTAGE, .owner = THIS_MODULE, }, { .name = "LDO17", .id = MAX8998_LDO17, .ops = &max8998_ldo_ops, .type = REGULATOR_VOLTAGE, .owner = THIS_MODULE, }, { .name = "BUCK1", .id = MAX8998_BUCK1, .ops = &max8998_buck_ops, .type = REGULATOR_VOLTAGE, .owner = THIS_MODULE, }, { .name = "BUCK2", .id = MAX8998_BUCK2, .ops = &max8998_buck_ops, .type = REGULATOR_VOLTAGE, .owner = THIS_MODULE, }, { .name = "BUCK3", .id = MAX8998_BUCK3, .ops = &max8998_buck_ops, .type = REGULATOR_VOLTAGE, .owner = THIS_MODULE, }, { .name = "BUCK4", .id = MAX8998_BUCK4, .ops = &max8998_buck_ops, .type = REGULATOR_VOLTAGE, .owner = THIS_MODULE, }, { .name = "EN32KHz AP", .id = MAX8998_EN32KHZ_AP, .ops = &max8998_others_ops, .type = REGULATOR_VOLTAGE, .owner = THIS_MODULE, }, { .name = "EN32KHz CP", .id = MAX8998_EN32KHZ_CP, .ops = &max8998_others_ops, .type = REGULATOR_VOLTAGE, .owner = THIS_MODULE, }, { .name = "ENVICHG", .id = MAX8998_ENVICHG, .ops = &max8998_others_ops, .type = REGULATOR_VOLTAGE, .owner = THIS_MODULE, }, { .name = "ESAFEOUT1", .id = MAX8998_ESAFEOUT1, .ops = &max8998_others_ops, .type = REGULATOR_VOLTAGE, .owner = THIS_MODULE, }, { .name = "ESAFEOUT2", .id = MAX8998_ESAFEOUT2, .ops = &max8998_others_ops, .type = REGULATOR_VOLTAGE, .owner = THIS_MODULE, } }; static __devinit int max8998_pmic_probe(struct platform_device *pdev) { struct max8998_dev *iodev = dev_get_drvdata(pdev->dev.parent); struct max8998_platform_data *pdata = dev_get_platdata(iodev->dev); struct regulator_dev **rdev; struct max8998_data *max8998; int i, ret, size; if (!pdata) { dev_err(pdev->dev.parent, "No platform init data supplied\n"); return -ENODEV; } max8998 = kzalloc(sizeof(struct max8998_data), GFP_KERNEL); if (!max8998) return -ENOMEM; size = sizeof(struct regulator_dev *) * pdata->num_regulators; max8998->rdev = kzalloc(size, GFP_KERNEL); if (!max8998->rdev) { kfree(max8998); return -ENOMEM; } rdev = max8998->rdev; max8998->dev = &pdev->dev; max8998->iodev = iodev; max8998->num_regulators = pdata->num_regulators; platform_set_drvdata(pdev, max8998); for (i = 0; i < pdata->num_regulators; i++) { const struct voltage_map_desc *desc; int id = pdata->regulators[i].id; int index = id - MAX8998_LDO2; desc = ldo_voltage_map[id]; if (desc && regulators[index].ops != &max8998_others_ops) { int count = (desc->max - desc->min) / desc->step + 1; regulators[index].n_voltages = count; } rdev[i] = regulator_register(®ulators[index], max8998->dev, pdata->regulators[i].initdata, max8998); if (IS_ERR(rdev[i])) { ret = PTR_ERR(rdev[i]); dev_err(max8998->dev, "regulator init failed\n"); rdev[i] = NULL; goto err; } } return 0; err: for (i = 0; i < max8998->num_regulators; i++) if (rdev[i]) regulator_unregister(rdev[i]); kfree(max8998->rdev); kfree(max8998); return ret; } static int __devexit max8998_pmic_remove(struct platform_device *pdev) { struct max8998_data *max8998 = platform_get_drvdata(pdev); struct regulator_dev **rdev = max8998->rdev; int i; for (i = 0; i < max8998->num_regulators; i++) if (rdev[i]) regulator_unregister(rdev[i]); kfree(max8998->rdev); kfree(max8998); return 0; } static struct platform_driver max8998_pmic_driver = { .driver = { .name = "max8998-pmic", .owner = THIS_MODULE, }, .probe = max8998_pmic_probe, .remove = __devexit_p(max8998_pmic_remove), }; static int __init max8998_pmic_init(void) { return platform_driver_register(&max8998_pmic_driver); } subsys_initcall(max8998_pmic_init); static void __exit max8998_pmic_cleanup(void) { platform_driver_unregister(&max8998_pmic_driver); } module_exit(max8998_pmic_cleanup); MODULE_DESCRIPTION("MAXIM 8998 voltage regulator driver"); MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>"); MODULE_LICENSE("GPL");