| /* |
| * s2mpb02-core.c - mfd core driver for the Samsung s2mpb02 |
| * |
| * Copyright (C) 2014 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 |
| * |
| * This driver is based on max77804.c |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/slab.h> |
| #include <linux/i2c.h> |
| #include <linux/irq.h> |
| #include <linux/interrupt.h> |
| #include <linux/mutex.h> |
| #include <linux/mfd/core.h> |
| #include <linux/mfd/s2mpb02.h> |
| #include <linux/mfd/s2mpb02-regulator.h> |
| #include <linux/regulator/machine.h> |
| |
| #ifdef CONFIG_OF |
| #include <linux/of_device.h> |
| #include <linux/of_gpio.h> |
| #endif /* CONFIG_OF */ |
| |
| static struct mfd_cell s2mpb02_devs[] = { |
| #ifdef CONFIG_LEDS_S2MPB02 |
| { .name = "s2mpb02-led", }, |
| #endif /* CONFIG_LEDS_S2MPB02 */ |
| { .name = "s2mpb02-regulator", }, |
| }; |
| |
| int s2mpb02_read_reg(struct i2c_client *i2c, u8 reg, u8 *dest) |
| { |
| struct s2mpb02_dev *s2mpb02 = i2c_get_clientdata(i2c); |
| int ret; |
| |
| mutex_lock(&s2mpb02->i2c_lock); |
| ret = i2c_smbus_read_byte_data(i2c, reg); |
| mutex_unlock(&s2mpb02->i2c_lock); |
| if (ret < 0) { |
| pr_info("%s:%s reg(0x%x), ret(%d)\n", |
| MFD_DEV_NAME, __func__, reg, ret); |
| return ret; |
| } |
| |
| ret &= 0xff; |
| *dest = ret; |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(s2mpb02_read_reg); |
| |
| int s2mpb02_bulk_read(struct i2c_client *i2c, u8 reg, int count, u8 *buf) |
| { |
| struct s2mpb02_dev *s2mpb02 = i2c_get_clientdata(i2c); |
| int ret; |
| |
| mutex_lock(&s2mpb02->i2c_lock); |
| ret = i2c_smbus_read_i2c_block_data(i2c, reg, count, buf); |
| mutex_unlock(&s2mpb02->i2c_lock); |
| if (ret < 0) |
| return ret; |
| |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(s2mpb02_bulk_read); |
| |
| int s2mpb02_write_reg(struct i2c_client *i2c, u8 reg, u8 value) |
| { |
| struct s2mpb02_dev *s2mpb02 = i2c_get_clientdata(i2c); |
| int ret; |
| |
| mutex_lock(&s2mpb02->i2c_lock); |
| ret = i2c_smbus_write_byte_data(i2c, reg, value); |
| mutex_unlock(&s2mpb02->i2c_lock); |
| if (ret < 0) |
| pr_info("%s:%s reg(0x%x), ret(%d)\n", |
| MFD_DEV_NAME, __func__, reg, ret); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(s2mpb02_write_reg); |
| |
| int s2mpb02_bulk_write(struct i2c_client *i2c, u8 reg, int count, u8 *buf) |
| { |
| struct s2mpb02_dev *s2mpb02 = i2c_get_clientdata(i2c); |
| int ret; |
| |
| mutex_lock(&s2mpb02->i2c_lock); |
| ret = i2c_smbus_write_i2c_block_data(i2c, reg, count, buf); |
| mutex_unlock(&s2mpb02->i2c_lock); |
| if (ret < 0) |
| return ret; |
| |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(s2mpb02_bulk_write); |
| |
| int s2mpb02_update_reg(struct i2c_client *i2c, u8 reg, u8 val, u8 mask) |
| { |
| struct s2mpb02_dev *s2mpb02 = i2c_get_clientdata(i2c); |
| int ret; |
| |
| mutex_lock(&s2mpb02->i2c_lock); |
| ret = i2c_smbus_read_byte_data(i2c, reg); |
| if (ret >= 0) { |
| u8 old_val = ret & 0xff; |
| u8 new_val = (val & mask) | (old_val & (~mask)); |
| ret = i2c_smbus_write_byte_data(i2c, reg, new_val); |
| } |
| mutex_unlock(&s2mpb02->i2c_lock); |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(s2mpb02_update_reg); |
| |
| #ifdef CONFIG_OF |
| static int of_s2mpb02_dt(struct device *dev, |
| struct s2mpb02_platform_data *pdata) |
| { |
| struct device_node *np_s2mpb02 = dev->of_node; |
| |
| if (!np_s2mpb02) |
| return -EINVAL; |
| |
| pdata->wakeup = of_property_read_bool(np_s2mpb02, "s2mpb02,wakeup"); |
| |
| return 0; |
| } |
| #else |
| static int of_s2mpb02_dt(struct device *dev, |
| struct s2mpb02_platform_data *pdata) |
| { |
| return 0; |
| } |
| #endif /* CONFIG_OF */ |
| |
| static int s2mpb02_i2c_probe(struct i2c_client *i2c, |
| const struct i2c_device_id *dev_id) |
| { |
| struct s2mpb02_dev *s2mpb02; |
| struct s2mpb02_platform_data *pdata = i2c->dev.platform_data; |
| |
| int ret = 0; |
| u8 reg_data; |
| |
| pr_info("%s:%s\n", MFD_DEV_NAME, __func__); |
| |
| s2mpb02 = kzalloc(sizeof(struct s2mpb02_dev), GFP_KERNEL); |
| if (!s2mpb02) { |
| dev_err(&i2c->dev, "%s: Failed to alloc mem for s2mpb02\n", |
| __func__); |
| return -ENOMEM; |
| } |
| |
| if (i2c->dev.of_node) { |
| pdata = devm_kzalloc(&i2c->dev, |
| sizeof(struct s2mpb02_platform_data), GFP_KERNEL); |
| if (!pdata) { |
| dev_err(&i2c->dev, "Failed to allocate memory\n"); |
| ret = -ENOMEM; |
| goto err_pdata; |
| } |
| |
| ret = of_s2mpb02_dt(&i2c->dev, pdata); |
| if (ret < 0) { |
| dev_err(&i2c->dev, "Failed to get device of_node\n"); |
| goto err; |
| } |
| |
| i2c->dev.platform_data = pdata; |
| } else |
| pdata = i2c->dev.platform_data; |
| |
| s2mpb02->dev = &i2c->dev; |
| s2mpb02->i2c = i2c; |
| s2mpb02->irq = i2c->irq; |
| if (pdata) { |
| s2mpb02->pdata = pdata; |
| |
| pdata->irq_base = irq_alloc_descs(-1, 600, S2MPB02_IRQ_NR, 0); |
| if (pdata->irq_base < 0) { |
| pr_err("%s:%s irq_alloc_descs Fail! ret(%d)\n", |
| MFD_DEV_NAME, __func__, pdata->irq_base); |
| ret = -EINVAL; |
| goto err; |
| } else { |
| s2mpb02->irq_base = pdata->irq_base; |
| } |
| |
| s2mpb02->wakeup = pdata->wakeup; |
| } else { |
| ret = -EINVAL; |
| goto err; |
| } |
| mutex_init(&s2mpb02->i2c_lock); |
| |
| i2c_set_clientdata(i2c, s2mpb02); |
| |
| if (s2mpb02_read_reg(s2mpb02->i2c, |
| S2MPB02_REG_BST_CTRL2, ®_data) < 0) { |
| pr_err("device not found on this channel!!\n"); |
| ret = -ENODEV; |
| } else { |
| if (reg_data == 0x90) { |
| S2MPB02_PMIC_REV(s2mpb02) = 1; |
| } else |
| S2MPB02_PMIC_REV(s2mpb02) = 0; |
| pr_info("%s: device id 0x%x is found\n", |
| __func__, s2mpb02->rev_num); |
| } |
| |
| ret = s2mpb02_irq_init(s2mpb02); |
| if (ret < 0) |
| goto err_irq_init; |
| |
| ret = mfd_add_devices(s2mpb02->dev, -1, s2mpb02_devs, |
| ARRAY_SIZE(s2mpb02_devs), NULL, 0, NULL); |
| if (ret < 0) |
| goto err_irq_init; |
| |
| device_init_wakeup(s2mpb02->dev, pdata->wakeup); |
| |
| return ret; |
| |
| err_irq_init: |
| mutex_destroy(&s2mpb02->i2c_lock); |
| err: |
| kfree(pdata); |
| s2mpb02_irq_exit(s2mpb02); |
| err_pdata: |
| kfree(s2mpb02); |
| |
| return ret; |
| } |
| |
| static int s2mpb02_i2c_remove(struct i2c_client *i2c) |
| { |
| struct s2mpb02_dev *s2mpb02 = i2c_get_clientdata(i2c); |
| |
| mfd_remove_devices(s2mpb02->dev); |
| s2mpb02_irq_exit(s2mpb02); |
| mutex_destroy(&s2mpb02->i2c_lock); |
| kfree(s2mpb02); |
| |
| return 0; |
| } |
| |
| static const struct i2c_device_id s2mpb02_i2c_id[] = { |
| { MFD_DEV_NAME, TYPE_S2MPB02 }, |
| { } |
| }; |
| MODULE_DEVICE_TABLE(i2c, s2mpb02_i2c_id); |
| |
| #if defined(CONFIG_OF) |
| static struct of_device_id s2mpb02_i2c_dt_ids[] = { |
| { .compatible = "s2mpb02,s2mpb02mfd" }, |
| {}, |
| }; |
| MODULE_DEVICE_TABLE(of, s2mpb02_i2c_dt_ids); |
| #endif /* CONFIG_OF */ |
| |
| #if defined(CONFIG_PM) |
| static int s2mpb02_suspend(struct device *dev) |
| { |
| struct i2c_client *i2c = container_of(dev, struct i2c_client, dev); |
| struct s2mpb02_dev *s2mpb02 = i2c_get_clientdata(i2c); |
| |
| if (device_may_wakeup(dev)) |
| enable_irq_wake(s2mpb02->irq); |
| |
| disable_irq(s2mpb02->irq); |
| |
| return 0; |
| } |
| |
| static int s2mpb02_resume(struct device *dev) |
| { |
| struct i2c_client *i2c = container_of(dev, struct i2c_client, dev); |
| struct s2mpb02_dev *s2mpb02 = i2c_get_clientdata(i2c); |
| |
| if (device_may_wakeup(dev)) |
| disable_irq_wake(s2mpb02->irq); |
| |
| enable_irq(s2mpb02->irq); |
| |
| return 0; |
| } |
| #else |
| #define s2mpb02_suspend NULL |
| #define s2mpb02_resume NULL |
| #endif /* CONFIG_PM */ |
| |
| const struct dev_pm_ops s2mpb02_pm = { |
| .suspend = s2mpb02_suspend, |
| .resume = s2mpb02_resume, |
| }; |
| |
| static struct i2c_driver s2mpb02_i2c_driver = { |
| .driver = { |
| .name = MFD_DEV_NAME, |
| .owner = THIS_MODULE, |
| #if defined(CONFIG_PM) |
| .pm = &s2mpb02_pm, |
| #endif /* CONFIG_PM */ |
| #if defined(CONFIG_OF) |
| .of_match_table = s2mpb02_i2c_dt_ids, |
| #endif /* CONFIG_OF */ |
| .suppress_bind_attrs = true, |
| }, |
| .probe = s2mpb02_i2c_probe, |
| .remove = s2mpb02_i2c_remove, |
| .id_table = s2mpb02_i2c_id, |
| }; |
| |
| static int __init s2mpb02_i2c_init(void) |
| { |
| pr_info("%s:%s\n", MFD_DEV_NAME, __func__); |
| return i2c_add_driver(&s2mpb02_i2c_driver); |
| } |
| /* init early so consumer devices can complete system boot */ |
| subsys_initcall(s2mpb02_i2c_init); |
| |
| static void __exit s2mpb02_i2c_exit(void) |
| { |
| i2c_del_driver(&s2mpb02_i2c_driver); |
| } |
| module_exit(s2mpb02_i2c_exit); |
| |
| MODULE_DESCRIPTION("SAMSUNG s2mpb02 multi-function core driver"); |
| MODULE_LICENSE("GPL"); |