/* * AS3711 PMIC regulator driver, using DCDC Step Down and LDO supplies * * Copyright (C) 2012 Renesas Electronics Corporation * Author: Guennadi Liakhovetski, <g.liakhovetski@gmx.de> * * This program is free software; you can redistribute it and/or modify * it under the terms of the version 2 of the GNU General Public License as * published by the Free Software Foundation */ #include <linux/err.h> #include <linux/init.h> #include <linux/mfd/as3711.h> #include <linux/module.h> #include <linux/of.h> #include <linux/platform_device.h> #include <linux/regmap.h> #include <linux/regulator/driver.h> #include <linux/regulator/of_regulator.h> #include <linux/slab.h> struct as3711_regulator_info { struct regulator_desc desc; unsigned int max_uV; }; struct as3711_regulator { struct as3711_regulator_info *reg_info; struct regulator_dev *rdev; }; static int as3711_list_voltage_sd(struct regulator_dev *rdev, unsigned int selector) { if (selector >= rdev->desc->n_voltages) return -EINVAL; if (!selector) return 0; if (selector < 0x41) return 600000 + selector * 12500; if (selector < 0x71) return 1400000 + (selector - 0x40) * 25000; return 2600000 + (selector - 0x70) * 50000; } static int as3711_list_voltage_aldo(struct regulator_dev *rdev, unsigned int selector) { if (selector >= rdev->desc->n_voltages) return -EINVAL; if (selector < 0x10) return 1200000 + selector * 50000; return 1800000 + (selector - 0x10) * 100000; } static int as3711_list_voltage_dldo(struct regulator_dev *rdev, unsigned int selector) { if (selector >= rdev->desc->n_voltages || (selector > 0x10 && selector < 0x20)) return -EINVAL; if (selector < 0x11) return 900000 + selector * 50000; return 1750000 + (selector - 0x20) * 50000; } static int as3711_bound_check(struct regulator_dev *rdev, int *min_uV, int *max_uV) { struct as3711_regulator *reg = rdev_get_drvdata(rdev); struct as3711_regulator_info *info = reg->reg_info; dev_dbg(&rdev->dev, "%s(), %d, %d, %d\n", __func__, *min_uV, rdev->desc->min_uV, info->max_uV); if (*max_uV < *min_uV || *min_uV > info->max_uV || rdev->desc->min_uV > *max_uV) return -EINVAL; if (rdev->desc->n_voltages == 1) return 0; if (*max_uV > info->max_uV) *max_uV = info->max_uV; if (*min_uV < rdev->desc->min_uV) *min_uV = rdev->desc->min_uV; return *min_uV; } static int as3711_sel_check(int min, int max, int bottom, int step) { int sel, voltage; /* Round up min, when dividing: keeps us within the range */ sel = DIV_ROUND_UP(min - bottom, step); voltage = sel * step + bottom; pr_debug("%s(): select %d..%d in %d+N*%d: %d\n", __func__, min, max, bottom, step, sel); if (voltage > max) return -EINVAL; return sel; } static int as3711_map_voltage_sd(struct regulator_dev *rdev, int min_uV, int max_uV) { int ret; ret = as3711_bound_check(rdev, &min_uV, &max_uV); if (ret <= 0) return ret; if (min_uV <= 1400000) return as3711_sel_check(min_uV, max_uV, 600000, 12500); if (min_uV <= 2600000) return as3711_sel_check(min_uV, max_uV, 1400000, 25000) + 0x40; return as3711_sel_check(min_uV, max_uV, 2600000, 50000) + 0x70; } /* * The regulator API supports 4 modes of operataion: FAST, NORMAL, IDLE and * STANDBY. We map them in the following way to AS3711 SD1-4 DCDC modes: * FAST: sdX_fast=1 * NORMAL: low_noise=1 * IDLE: low_noise=0 */ static int as3711_set_mode_sd(struct regulator_dev *rdev, unsigned int mode) { unsigned int fast_bit = rdev->desc->enable_mask, low_noise_bit = fast_bit << 4; u8 val; switch (mode) { case REGULATOR_MODE_FAST: val = fast_bit | low_noise_bit; break; case REGULATOR_MODE_NORMAL: val = low_noise_bit; break; case REGULATOR_MODE_IDLE: val = 0; break; default: return -EINVAL; } return regmap_update_bits(rdev->regmap, AS3711_SD_CONTROL_1, low_noise_bit | fast_bit, val); } static unsigned int as3711_get_mode_sd(struct regulator_dev *rdev) { unsigned int fast_bit = rdev->desc->enable_mask, low_noise_bit = fast_bit << 4, mask = fast_bit | low_noise_bit; unsigned int val; int ret = regmap_read(rdev->regmap, AS3711_SD_CONTROL_1, &val); if (ret < 0) return ret; if ((val & mask) == mask) return REGULATOR_MODE_FAST; if ((val & mask) == low_noise_bit) return REGULATOR_MODE_NORMAL; if (!(val & mask)) return REGULATOR_MODE_IDLE; return -EINVAL; } static int as3711_map_voltage_aldo(struct regulator_dev *rdev, int min_uV, int max_uV) { int ret; ret = as3711_bound_check(rdev, &min_uV, &max_uV); if (ret <= 0) return ret; if (min_uV <= 1800000) return as3711_sel_check(min_uV, max_uV, 1200000, 50000); return as3711_sel_check(min_uV, max_uV, 1800000, 100000) + 0x10; } static int as3711_map_voltage_dldo(struct regulator_dev *rdev, int min_uV, int max_uV) { int ret; ret = as3711_bound_check(rdev, &min_uV, &max_uV); if (ret <= 0) return ret; if (min_uV <= 1700000) return as3711_sel_check(min_uV, max_uV, 900000, 50000); return as3711_sel_check(min_uV, max_uV, 1750000, 50000) + 0x20; } static struct regulator_ops as3711_sd_ops = { .is_enabled = regulator_is_enabled_regmap, .enable = regulator_enable_regmap, .disable = regulator_disable_regmap, .get_voltage_sel = regulator_get_voltage_sel_regmap, .set_voltage_sel = regulator_set_voltage_sel_regmap, .list_voltage = as3711_list_voltage_sd, .map_voltage = as3711_map_voltage_sd, .get_mode = as3711_get_mode_sd, .set_mode = as3711_set_mode_sd, }; static struct regulator_ops as3711_aldo_ops = { .is_enabled = regulator_is_enabled_regmap, .enable = regulator_enable_regmap, .disable = regulator_disable_regmap, .get_voltage_sel = regulator_get_voltage_sel_regmap, .set_voltage_sel = regulator_set_voltage_sel_regmap, .list_voltage = as3711_list_voltage_aldo, .map_voltage = as3711_map_voltage_aldo, }; static struct regulator_ops as3711_dldo_ops = { .is_enabled = regulator_is_enabled_regmap, .enable = regulator_enable_regmap, .disable = regulator_disable_regmap, .get_voltage_sel = regulator_get_voltage_sel_regmap, .set_voltage_sel = regulator_set_voltage_sel_regmap, .list_voltage = as3711_list_voltage_dldo, .map_voltage = as3711_map_voltage_dldo, }; #define AS3711_REG(_id, _en_reg, _en_bit, _vmask, _vshift, _min_uV, _max_uV, _sfx) \ [AS3711_REGULATOR_ ## _id] = { \ .desc = { \ .name = "as3711-regulator-" # _id, \ .id = AS3711_REGULATOR_ ## _id, \ .n_voltages = (_vmask + 1), \ .ops = &as3711_ ## _sfx ## _ops, \ .type = REGULATOR_VOLTAGE, \ .owner = THIS_MODULE, \ .vsel_reg = AS3711_ ## _id ## _VOLTAGE, \ .vsel_mask = _vmask << _vshift, \ .enable_reg = AS3711_ ## _en_reg, \ .enable_mask = BIT(_en_bit), \ .min_uV = _min_uV, \ }, \ .max_uV = _max_uV, \ } static struct as3711_regulator_info as3711_reg_info[] = { AS3711_REG(SD_1, SD_CONTROL, 0, 0x7f, 0, 612500, 3350000, sd), AS3711_REG(SD_2, SD_CONTROL, 1, 0x7f, 0, 612500, 3350000, sd), AS3711_REG(SD_3, SD_CONTROL, 2, 0x7f, 0, 612500, 3350000, sd), AS3711_REG(SD_4, SD_CONTROL, 3, 0x7f, 0, 612500, 3350000, sd), AS3711_REG(LDO_1, LDO_1_VOLTAGE, 7, 0x1f, 0, 1200000, 3300000, aldo), AS3711_REG(LDO_2, LDO_2_VOLTAGE, 7, 0x1f, 0, 1200000, 3300000, aldo), AS3711_REG(LDO_3, LDO_3_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo), AS3711_REG(LDO_4, LDO_4_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo), AS3711_REG(LDO_5, LDO_5_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo), AS3711_REG(LDO_6, LDO_6_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo), AS3711_REG(LDO_7, LDO_7_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo), AS3711_REG(LDO_8, LDO_8_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo), /* StepUp output voltage depends on supplying regulator */ }; #define AS3711_REGULATOR_NUM ARRAY_SIZE(as3711_reg_info) static struct of_regulator_match as3711_regulator_matches[AS3711_REGULATOR_NUM] = { [AS3711_REGULATOR_SD_1] = { .name = "sd1" }, [AS3711_REGULATOR_SD_2] = { .name = "sd2" }, [AS3711_REGULATOR_SD_3] = { .name = "sd3" }, [AS3711_REGULATOR_SD_4] = { .name = "sd4" }, [AS3711_REGULATOR_LDO_1] = { .name = "ldo1" }, [AS3711_REGULATOR_LDO_2] = { .name = "ldo2" }, [AS3711_REGULATOR_LDO_3] = { .name = "ldo3" }, [AS3711_REGULATOR_LDO_4] = { .name = "ldo4" }, [AS3711_REGULATOR_LDO_5] = { .name = "ldo5" }, [AS3711_REGULATOR_LDO_6] = { .name = "ldo6" }, [AS3711_REGULATOR_LDO_7] = { .name = "ldo7" }, [AS3711_REGULATOR_LDO_8] = { .name = "ldo8" }, }; static int as3711_regulator_parse_dt(struct device *dev, struct device_node **of_node, const int count) { struct as3711_regulator_pdata *pdata = dev_get_platdata(dev); struct device_node *regulators = of_find_node_by_name(dev->parent->of_node, "regulators"); struct of_regulator_match *match; int ret, i; if (!regulators) { dev_err(dev, "regulator node not found\n"); return -ENODEV; } ret = of_regulator_match(dev->parent, regulators, as3711_regulator_matches, count); of_node_put(regulators); if (ret < 0) { dev_err(dev, "Error parsing regulator init data: %d\n", ret); return ret; } for (i = 0, match = as3711_regulator_matches; i < count; i++, match++) if (match->of_node) { pdata->init_data[i] = match->init_data; of_node[i] = match->of_node; } return 0; } static int as3711_regulator_probe(struct platform_device *pdev) { struct as3711_regulator_pdata *pdata = dev_get_platdata(&pdev->dev); struct as3711 *as3711 = dev_get_drvdata(pdev->dev.parent); struct regulator_init_data *reg_data; struct regulator_config config = {.dev = &pdev->dev,}; struct as3711_regulator *reg = NULL; struct as3711_regulator *regs; struct device_node *of_node[AS3711_REGULATOR_NUM] = {}; struct regulator_dev *rdev; struct as3711_regulator_info *ri; int ret; int id; if (!pdata) { dev_err(&pdev->dev, "No platform data...\n"); return -ENODEV; } if (pdev->dev.parent->of_node) { ret = as3711_regulator_parse_dt(&pdev->dev, of_node, AS3711_REGULATOR_NUM); if (ret < 0) { dev_err(&pdev->dev, "DT parsing failed: %d\n", ret); return ret; } } regs = devm_kzalloc(&pdev->dev, AS3711_REGULATOR_NUM * sizeof(struct as3711_regulator), GFP_KERNEL); if (!regs) { dev_err(&pdev->dev, "Memory allocation failed exiting..\n"); return -ENOMEM; } for (id = 0, ri = as3711_reg_info; id < AS3711_REGULATOR_NUM; ++id, ri++) { reg_data = pdata->init_data[id]; /* No need to register if there is no regulator data */ if (!reg_data) continue; reg = ®s[id]; reg->reg_info = ri; config.init_data = reg_data; config.driver_data = reg; config.regmap = as3711->regmap; config.of_node = of_node[id]; rdev = regulator_register(&ri->desc, &config); if (IS_ERR(rdev)) { dev_err(&pdev->dev, "Failed to register regulator %s\n", ri->desc.name); ret = PTR_ERR(rdev); goto eregreg; } reg->rdev = rdev; } platform_set_drvdata(pdev, regs); return 0; eregreg: while (--id >= 0) regulator_unregister(regs[id].rdev); return ret; } static int as3711_regulator_remove(struct platform_device *pdev) { struct as3711_regulator *regs = platform_get_drvdata(pdev); int id; for (id = 0; id < AS3711_REGULATOR_NUM; ++id) regulator_unregister(regs[id].rdev); return 0; } static struct platform_driver as3711_regulator_driver = { .driver = { .name = "as3711-regulator", .owner = THIS_MODULE, }, .probe = as3711_regulator_probe, .remove = as3711_regulator_remove, }; static int __init as3711_regulator_init(void) { return platform_driver_register(&as3711_regulator_driver); } subsys_initcall(as3711_regulator_init); static void __exit as3711_regulator_exit(void) { platform_driver_unregister(&as3711_regulator_driver); } module_exit(as3711_regulator_exit); MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>"); MODULE_DESCRIPTION("AS3711 regulator driver"); MODULE_ALIAS("platform:as3711-regulator"); MODULE_LICENSE("GPL v2");