/* * s2mpb03.c - Regulator driver for the Samsung s2mpb03 * * Copyright (C) 2016 Samsung Electronics * * 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 #include #include #include #include #include #include #include #include #include #include #include #if IS_ENABLED(CONFIG_REGULATOR_DEBUG_CONTROL) #include #endif #include #include #if IS_ENABLED(CONFIG_DRV_SAMSUNG_PMIC) #include #endif struct s2mpb03_data { struct s2mpb03_dev *iodev; int num_regulators; struct regulator_dev *rdev[S2MPB03_REGULATOR_MAX]; #if IS_ENABLED(CONFIG_DRV_SAMSUNG_PMIC) u8 read_addr; u8 read_val; struct device *dev; #endif }; int s2mpb03_read_reg(struct i2c_client *i2c, u8 reg, u8 *dest) { struct s2mpb03_data *info = i2c_get_clientdata(i2c); struct s2mpb03_dev *s2mpb03 = info->iodev; int ret; mutex_lock(&s2mpb03->i2c_lock); ret = i2c_smbus_read_byte_data(i2c, reg); mutex_unlock(&s2mpb03->i2c_lock); if (ret < 0) { pr_info("%s:%s reg(0x%02hhx), ret(%d)\n", MFD_DEV_NAME, __func__, reg, ret); return ret; } ret &= 0xff; *dest = ret; return 0; } EXPORT_SYMBOL_GPL(s2mpb03_read_reg); int s2mpb03_bulk_read(struct i2c_client *i2c, u8 reg, int count, u8 *buf) { struct s2mpb03_data *info = i2c_get_clientdata(i2c); struct s2mpb03_dev *s2mpb03 = info->iodev; int ret; mutex_lock(&s2mpb03->i2c_lock); ret = i2c_smbus_read_i2c_block_data(i2c, reg, count, buf); mutex_unlock(&s2mpb03->i2c_lock); if (ret < 0) return ret; return 0; } EXPORT_SYMBOL_GPL(s2mpb03_bulk_read); int s2mpb03_read_word(struct i2c_client *i2c, u8 reg) { struct s2mpb03_data *info = i2c_get_clientdata(i2c); struct s2mpb03_dev *s2mpb03 = info->iodev; int ret; mutex_lock(&s2mpb03->i2c_lock); ret = i2c_smbus_read_word_data(i2c, reg); mutex_unlock(&s2mpb03->i2c_lock); if (ret < 0) return ret; return ret; } EXPORT_SYMBOL_GPL(s2mpb03_read_word); int s2mpb03_write_reg(struct i2c_client *i2c, u8 reg, u8 value) { struct s2mpb03_data *info = i2c_get_clientdata(i2c); struct s2mpb03_dev *s2mpb03 = info->iodev; int ret; mutex_lock(&s2mpb03->i2c_lock); ret = i2c_smbus_write_byte_data(i2c, reg, value); mutex_unlock(&s2mpb03->i2c_lock); if (ret < 0) pr_info("%s:%s reg(0x%02hhx), ret(%d)\n", MFD_DEV_NAME, __func__, reg, ret); return ret; } EXPORT_SYMBOL_GPL(s2mpb03_write_reg); int s2mpb03_bulk_write(struct i2c_client *i2c, u8 reg, int count, u8 *buf) { struct s2mpb03_data *info = i2c_get_clientdata(i2c); struct s2mpb03_dev *s2mpb03 = info->iodev; int ret; mutex_lock(&s2mpb03->i2c_lock); ret = i2c_smbus_write_i2c_block_data(i2c, reg, count, buf); mutex_unlock(&s2mpb03->i2c_lock); if (ret < 0) return ret; return 0; } EXPORT_SYMBOL_GPL(s2mpb03_bulk_write); int s2mpb03_update_reg(struct i2c_client *i2c, u8 reg, u8 val, u8 mask) { struct s2mpb03_data *info = i2c_get_clientdata(i2c); struct s2mpb03_dev *s2mpb03 = info->iodev; int ret; u8 old_val, new_val; mutex_lock(&s2mpb03->i2c_lock); ret = i2c_smbus_read_byte_data(i2c, reg); if (ret >= 0) { old_val = ret & 0xff; new_val = (val & mask) | (old_val & (~mask)); ret = i2c_smbus_write_byte_data(i2c, reg, new_val); } mutex_unlock(&s2mpb03->i2c_lock); return ret; } EXPORT_SYMBOL_GPL(s2mpb03_update_reg); static int s2m_enable(struct regulator_dev *rdev) { struct s2mpb03_data *info = rdev_get_drvdata(rdev); struct i2c_client *i2c = info->iodev->i2c; return s2mpb03_update_reg(i2c, rdev->desc->enable_reg, rdev->desc->enable_mask, rdev->desc->enable_mask); } static int s2m_disable_regmap(struct regulator_dev *rdev) { struct s2mpb03_data *info = rdev_get_drvdata(rdev); struct i2c_client *i2c = info->iodev->i2c; u8 val; if (rdev->desc->enable_is_inverted) val = rdev->desc->enable_mask; else val = 0; return s2mpb03_update_reg(i2c, rdev->desc->enable_reg, val, rdev->desc->enable_mask); } static int s2m_is_enabled_regmap(struct regulator_dev *rdev) { struct s2mpb03_data *info = rdev_get_drvdata(rdev); struct i2c_client *i2c = info->iodev->i2c; int ret; u8 val; ret = s2mpb03_read_reg(i2c, rdev->desc->enable_reg, &val); if (ret < 0) return ret; if (rdev->desc->enable_is_inverted) return (val & rdev->desc->enable_mask) == 0; else return (val & rdev->desc->enable_mask) != 0; } static int s2m_get_voltage_sel_regmap(struct regulator_dev *rdev) { struct s2mpb03_data *info = rdev_get_drvdata(rdev); struct i2c_client *i2c = info->iodev->i2c; int ret; u8 val; ret = s2mpb03_read_reg(i2c, rdev->desc->vsel_reg, &val); if (ret < 0) return ret; val &= rdev->desc->vsel_mask; return val; } static int s2m_set_voltage_sel_regmap(struct regulator_dev *rdev, unsigned sel) { struct s2mpb03_data *info = rdev_get_drvdata(rdev); struct i2c_client *i2c = info->iodev->i2c; int ret; ret = s2mpb03_update_reg(i2c, rdev->desc->vsel_reg, sel, rdev->desc->vsel_mask); if (ret < 0) goto out; if (rdev->desc->apply_bit) ret = s2mpb03_update_reg(i2c, rdev->desc->apply_reg, rdev->desc->apply_bit, rdev->desc->apply_bit); return ret; out: pr_warn("%s: failed to set voltage_sel_regmap\n", rdev->desc->name); return ret; } static int s2m_set_voltage_time_sel(struct regulator_dev *rdev, unsigned int old_selector, unsigned int new_selector) { int old_volt, new_volt; /* sanity check */ if (!rdev->desc->ops->list_voltage) return -EINVAL; old_volt = rdev->desc->ops->list_voltage(rdev, old_selector); new_volt = rdev->desc->ops->list_voltage(rdev, new_selector); if (old_selector < new_selector) return DIV_ROUND_UP(new_volt - old_volt, S2MPB03_RAMP_DELAY); return 0; } static struct regulator_ops s2mpb03_ldo_ops = { .list_voltage = regulator_list_voltage_linear, .map_voltage = regulator_map_voltage_linear, .is_enabled = s2m_is_enabled_regmap, .enable = s2m_enable, .disable = s2m_disable_regmap, .get_voltage_sel = s2m_get_voltage_sel_regmap, .set_voltage_sel = s2m_set_voltage_sel_regmap, .set_voltage_time_sel = s2m_set_voltage_time_sel, }; #define _LDO(macro) S2MPB03_LDO##macro #define _REG(ctrl) S2MPB03_REG##ctrl #define _ldo_ops(num) s2mpb03_ldo_ops##num #define _TIME(macro) S2MPB03_ENABLE_TIME##macro #define LDO_DESC(_name, _id, _ops, m, s, v, e, t) { \ .name = _name, \ .id = _id, \ .ops = _ops, \ .type = REGULATOR_VOLTAGE, \ .owner = THIS_MODULE, \ .min_uV = m, \ .uV_step = s, \ .n_voltages = S2MPB03_LDO_N_VOLTAGES, \ .vsel_reg = v, \ .vsel_mask = S2MPB03_LDO_VSEL_MASK, \ .enable_reg = e, \ .enable_mask = S2MPB03_LDO_ENABLE_MASK, \ .enable_time = t \ } static struct regulator_desc regulators[S2MPB03_REGULATOR_MAX] = { /* name, id, ops, min_uv, uV_step, vsel_reg, enable_reg */ LDO_DESC("s2mpb03-ldo1", _LDO(1), &_ldo_ops(), _LDO(_MIN1), _LDO(_STEP2), _REG(_LDO1_CTRL), _REG(_LDO1_CTRL), _TIME(_LDO)), LDO_DESC("s2mpb03-ldo2", _LDO(2), &_ldo_ops(), _LDO(_MIN1), _LDO(_STEP2), _REG(_LDO2_CTRL), _REG(_LDO2_CTRL), _TIME(_LDO)), LDO_DESC("s2mpb03-ldo3", _LDO(3), &_ldo_ops(), _LDO(_MIN1), _LDO(_STEP1), _REG(_LDO3_CTRL), _REG(_LDO3_CTRL), _TIME(_LDO)), LDO_DESC("s2mpb03-ldo4", _LDO(4), &_ldo_ops(), _LDO(_MIN1), _LDO(_STEP2), _REG(_LDO4_CTRL), _REG(_LDO4_CTRL), _TIME(_LDO)), LDO_DESC("s2mpb03-ldo5", _LDO(5), &_ldo_ops(), _LDO(_MIN2), _LDO(_STEP1), _REG(_LDO5_CTRL), _REG(_LDO5_CTRL), _TIME(_LDO)), LDO_DESC("s2mpb03-ldo6", _LDO(6), &_ldo_ops(), _LDO(_MIN2), _LDO(_STEP1), _REG(_LDO6_CTRL), _REG(_LDO6_CTRL), _TIME(_LDO)), LDO_DESC("s2mpb03-ldo7", _LDO(7), &_ldo_ops(), _LDO(_MIN2), _LDO(_STEP1), _REG(_LDO7_CTRL), _REG(_LDO7_CTRL), _TIME(_LDO)) }; #if IS_ENABLED(CONFIG_OF) static int s2mpb03_pmic_dt_parse_pdata(struct device *dev, struct s2mpb03_platform_data *pdata) { struct device_node *pmic_np, *regulators_np, *reg_np; struct s2mpb03_regulator_data *rdata; size_t i; pmic_np = dev->of_node; if (!pmic_np) { dev_err(dev, "could not find pmic sub-node\n"); return -ENODEV; } pdata->wakeup = of_property_read_bool(pmic_np, "s2mpb03,wakeup"); regulators_np = of_find_node_by_name(pmic_np, "regulators"); if (!regulators_np) { dev_err(dev, "could not find regulators sub-node\n"); return -EINVAL; } /* count the number of regulators to be supported in pmic */ pdata->num_regulators = 0; for_each_child_of_node(regulators_np, reg_np) { pdata->num_regulators++; } rdata = devm_kzalloc(dev, sizeof(*rdata) * pdata->num_regulators, GFP_KERNEL); if (!rdata) { dev_err(dev, "could not allocate memory for regulator data\n"); return -ENOMEM; } pdata->regulators = rdata; pdata->num_rdata = 0; for_each_child_of_node(regulators_np, reg_np) { for (i = 0; i < ARRAY_SIZE(regulators); i++) if (!of_node_cmp(reg_np->name, regulators[i].name)) break; if (i == ARRAY_SIZE(regulators)) { dev_warn(dev, "don't know how to configure regulator %s\n", reg_np->name); continue; } rdata->id = i; rdata->initdata = of_get_regulator_init_data( dev, reg_np, ®ulators[i]); rdata->reg_node = reg_np; rdata++; pdata->num_rdata++; } of_node_put(regulators_np); return 0; } #else static int s2mpb03_pmic_dt_parse_pdata(struct s2mpb03_dev *iodev, struct s2mpb03_platform_data *pdata) { return 0; } #endif /* CONFIG_OF */ #if IS_ENABLED(CONFIG_DRV_SAMSUNG_PMIC) static ssize_t s2mpb03_read_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t size) { struct s2mpb03_data *s2mpb03 = dev_get_drvdata(dev); int ret; u8 val, reg_addr; if (buf == NULL) { pr_info("%s: empty buffer\n", __func__); return -1; } ret = kstrtou8(buf, 0, ®_addr); if (ret < 0) pr_info("%s: fail to transform i2c address\n", __func__); ret = s2mpb03_read_reg(s2mpb03->iodev->i2c, reg_addr, &val); if (ret < 0) pr_info("%s: fail to read i2c address\n", __func__); pr_info("%s: reg(0x%02hhx) data(0x%02hhx)\n", __func__, reg_addr, val); s2mpb03->read_addr = reg_addr; s2mpb03->read_val = val; return size; } static ssize_t s2mpb03_read_show(struct device *dev, struct device_attribute *attr, char *buf) { struct s2mpb03_data *s2mpb03 = dev_get_drvdata(dev); return sprintf(buf, "0x%02hhx: 0x%02hhx\n", s2mpb03->read_addr, s2mpb03->read_val); } static ssize_t s2mpb03_write_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t size) { struct s2mpb03_data *s2mpb03 = dev_get_drvdata(dev); int ret; u8 reg = 0, data = 0; if (buf == NULL) { pr_info("%s: empty buffer\n", __func__); return size; } ret = sscanf(buf, "0x%02hhx 0x%02hhx", ®, &data); if (ret != 2) { pr_info("%s: input error\n", __func__); return size; } pr_info("%s: reg(0x%02hhx) data(0x%02hhx)\n", __func__, reg, data); ret = s2mpb03_write_reg(s2mpb03->iodev->i2c, reg, data); if (ret < 0) pr_info("%s: fail to write i2c addr/data\n", __func__); return size; } static ssize_t s2mpb03_write_show(struct device *dev, struct device_attribute *attr, char *buf) { return sprintf(buf, "echo (register addr.) (data) > s2mpb03_write\n"); } #define ATTR_REGULATOR (2) static struct pmic_device_attribute regulator_attr[] = { PMIC_ATTR(s2mpb03_write, S_IRUGO | S_IWUSR, s2mpb03_write_show, s2mpb03_write_store), PMIC_ATTR(s2mpb03_read, S_IRUGO | S_IWUSR, s2mpb03_read_show, s2mpb03_read_store), }; static int s2mpb03_create_sysfs(struct s2mpb03_data *s2mpb03) { struct device *s2mpb03_pmic = s2mpb03->dev; struct device *dev = s2mpb03->iodev->dev; char device_name[32] = {0,}; int err = -ENODEV, i = 0; pr_info("%s()\n", __func__); s2mpb03->read_addr = 0; s2mpb03->read_val = 0; /* Dynamic allocation for device name */ snprintf(device_name, sizeof(device_name) - 1, "%s@%s", dev_driver_string(dev), dev_name(dev)); s2mpb03_pmic = pmic_device_create(s2mpb03, device_name); s2mpb03->dev = s2mpb03_pmic; /* Create sysfs entries */ for (i = 0; i < ATTR_REGULATOR; i++) { err = device_create_file(s2mpb03_pmic, ®ulator_attr[i].dev_attr); if (err) goto remove_pmic_device; } return 0; remove_pmic_device: for (i--; i >= 0; i--) device_remove_file(s2mpb03_pmic, ®ulator_attr[i].dev_attr); pmic_device_destroy(s2mpb03_pmic->devt); return -1; } #endif static int s2mpb03_pmic_probe(struct i2c_client *i2c, const struct i2c_device_id *dev_id) { struct s2mpb03_dev *iodev; struct s2mpb03_platform_data *pdata = i2c->dev.platform_data; struct regulator_config config = { }; struct s2mpb03_data *s2mpb03; size_t i; int ret = 0; pr_info("%s:%s\n", MFD_DEV_NAME, __func__); iodev = devm_kzalloc(&i2c->dev, sizeof(struct s2mpb03_dev), GFP_KERNEL); if (!iodev) { dev_err(&i2c->dev, "%s: Failed to alloc mem for s2mpb03\n", __func__); return -ENOMEM; } if (i2c->dev.of_node) { pdata = devm_kzalloc(&i2c->dev, sizeof(struct s2mpb03_platform_data), GFP_KERNEL); if (!pdata) { dev_err(&i2c->dev, "Failed to allocate memory\n"); ret = -ENOMEM; goto err_pdata; } ret = s2mpb03_pmic_dt_parse_pdata(&i2c->dev, pdata); if (ret < 0) { dev_err(&i2c->dev, "Failed to get device of_node\n"); goto err_pdata; } i2c->dev.platform_data = pdata; } else pdata = i2c->dev.platform_data; iodev->dev = &i2c->dev; iodev->i2c = i2c; if (pdata) { iodev->pdata = pdata; iodev->wakeup = pdata->wakeup; } else { ret = -EINVAL; goto err_pdata; } mutex_init(&iodev->i2c_lock); s2mpb03 = devm_kzalloc(&i2c->dev, sizeof(struct s2mpb03_data), GFP_KERNEL); if (!s2mpb03) { pr_info("[%s:%d] if (!s2mpb03)\n", __FILE__, __LINE__); ret = -ENOMEM; goto err_s2mpb03_data; } i2c_set_clientdata(i2c, s2mpb03); s2mpb03->iodev = iodev; s2mpb03->num_regulators = pdata->num_rdata; for (i = 0; i < pdata->num_rdata; i++) { int id = pdata->regulators[i].id; config.dev = &i2c->dev; config.init_data = pdata->regulators[i].initdata; config.driver_data = s2mpb03; config.of_node = pdata->regulators[i].reg_node; s2mpb03->rdev[i] = devm_regulator_register(&i2c->dev, ®ulators[id], &config); if (IS_ERR(s2mpb03->rdev[i])) { ret = PTR_ERR(s2mpb03->rdev[i]); dev_err(&i2c->dev, "regulator init failed for %d\n", id); s2mpb03->rdev[i] = NULL; goto err_s2mpb03_data; } #if IS_ENABLED(CONFIG_REGULATOR_DEBUG_CONTROL) ret = devm_regulator_debug_register(&i2c->dev, s2mpb03->rdev[i]); if (ret) dev_err(&i2c->dev, "failed to register debug regulator for %d, rc=%d\n", i, ret); #endif } #if IS_ENABLED(CONFIG_DRV_SAMSUNG_PMIC) ret = s2mpb03_create_sysfs(s2mpb03); if (ret < 0) { pr_err("%s: s2mpb03_create_sysfs fail\n", __func__); goto err_s2mpb03_data; } #endif return ret; err_s2mpb03_data: mutex_destroy(&iodev->i2c_lock); err_pdata: pr_info("[%s:%d] err\n", __func__, __LINE__); return ret; } #if IS_ENABLED(CONFIG_OF) static struct of_device_id s2mpb03_i2c_dt_ids[] = { { .compatible = "samsung,s2mpb03pmic" }, { }, }; #endif /* CONFIG_OF */ static int s2mpb03_pmic_remove(struct i2c_client *i2c) { #if IS_ENABLED(CONFIG_DRV_SAMSUNG_PMIC) struct s2mpb03_data *info = i2c_get_clientdata(i2c); struct device *s2mpb03_pmic = info->dev; int i = 0; dev_info(&i2c->dev, "%s\n", __func__); /* Remove sysfs entries */ for (i = 0; i < ATTR_REGULATOR; i++) device_remove_file(s2mpb03_pmic, ®ulator_attr[i].dev_attr); pmic_device_destroy(s2mpb03_pmic->devt); #else dev_info(&i2c->dev, "%s\n", __func__); #endif return 0; } #if IS_ENABLED(CONFIG_OF) static const struct i2c_device_id s2mpb03_pmic_id[] = { {"s2mpb03-regulator", 0}, {}, }; #endif static struct i2c_driver s2mpb03_i2c_driver = { .driver = { .name = "s2mpb03-regulator", .owner = THIS_MODULE, #if IS_ENABLED(CONFIG_OF) .of_match_table = s2mpb03_i2c_dt_ids, #endif /* CONFIG_OF */ .suppress_bind_attrs = true, }, .probe = s2mpb03_pmic_probe, .remove = s2mpb03_pmic_remove, .id_table = s2mpb03_pmic_id, }; static int __init s2mpb03_i2c_init(void) { pr_info("%s:%s\n", MFD_DEV_NAME, __func__); return i2c_add_driver(&s2mpb03_i2c_driver); } subsys_initcall(s2mpb03_i2c_init); static void __exit s2mpb03_i2c_exit(void) { i2c_del_driver(&s2mpb03_i2c_driver); } module_exit(s2mpb03_i2c_exit); MODULE_DESCRIPTION("SAMSUNG s2mpb03 Regulator Driver"); MODULE_LICENSE("GPL");