408 lines
9.7 KiB
C
408 lines
9.7 KiB
C
/*
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* s2mpb02-core.c - mfd core driver for the Samsung s2mpb02
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*
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* Copyright (C) 2014 Samsung Electronics
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* This driver is based on max77804.c
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*/
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/i2c.h>
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#include <linux/irq.h>
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#include <linux/interrupt.h>
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#include <linux/mutex.h>
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#include <linux/mfd/core.h>
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#include <linux/mfd/s2mpb02.h>
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#include <linux/mfd/s2mpb02-private.h>
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#include <linux/regulator/machine.h>
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#if defined (CONFIG_OF)
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#include <linux/of_device.h>
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#include <linux/of_gpio.h>
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#endif /* CONFIG_OF */
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extern unsigned int system_rev;
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static struct mfd_cell s2mpb02_devs[] = {
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#if defined(CONFIG_LEDS_S2MPB02)
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{ .name = "s2mpb02-led", },
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#endif /* CONFIG_LEDS_S2MPB02 */
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{ .name = "s2mpb02-regulator", },
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};
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int s2mpb02_read_reg(struct i2c_client *i2c, u8 reg, u8 *dest)
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{
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struct s2mpb02_dev *s2mpb02 = i2c_get_clientdata(i2c);
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int ret;
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mutex_lock(&s2mpb02->i2c_lock);
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ret = i2c_smbus_read_byte_data(i2c, reg);
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mutex_unlock(&s2mpb02->i2c_lock);
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if (ret < 0) {
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pr_info("%s:%s reg(0x%x), ret(%d)\n", MFD_DEV_NAME, __func__, reg, ret);
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return ret;
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}
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ret &= 0xff;
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*dest = ret;
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return 0;
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}
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EXPORT_SYMBOL_GPL(s2mpb02_read_reg);
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int s2mpb02_bulk_read(struct i2c_client *i2c, u8 reg, int count, u8 *buf)
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{
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struct s2mpb02_dev *s2mpb02 = i2c_get_clientdata(i2c);
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int ret;
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mutex_lock(&s2mpb02->i2c_lock);
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ret = i2c_smbus_read_i2c_block_data(i2c, reg, count, buf);
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mutex_unlock(&s2mpb02->i2c_lock);
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if (ret < 0)
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return ret;
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return 0;
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}
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EXPORT_SYMBOL_GPL(s2mpb02_bulk_read);
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int s2mpb02_write_reg(struct i2c_client *i2c, u8 reg, u8 value)
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{
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struct s2mpb02_dev *s2mpb02 = i2c_get_clientdata(i2c);
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int ret;
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mutex_lock(&s2mpb02->i2c_lock);
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ret = i2c_smbus_write_byte_data(i2c, reg, value);
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mutex_unlock(&s2mpb02->i2c_lock);
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if (ret < 0)
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pr_info("%s:%s reg(0x%x), ret(%d)\n",
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MFD_DEV_NAME, __func__, reg, ret);
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return ret;
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}
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EXPORT_SYMBOL_GPL(s2mpb02_write_reg);
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int s2mpb02_bulk_write(struct i2c_client *i2c, u8 reg, int count, u8 *buf)
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{
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struct s2mpb02_dev *s2mpb02 = i2c_get_clientdata(i2c);
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int ret;
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mutex_lock(&s2mpb02->i2c_lock);
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ret = i2c_smbus_write_i2c_block_data(i2c, reg, count, buf);
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mutex_unlock(&s2mpb02->i2c_lock);
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if (ret < 0)
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return ret;
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return 0;
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}
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EXPORT_SYMBOL_GPL(s2mpb02_bulk_write);
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int s2mpb02_update_reg(struct i2c_client *i2c, u8 reg, u8 val, u8 mask)
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{
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struct s2mpb02_dev *s2mpb02 = i2c_get_clientdata(i2c);
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int ret;
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mutex_lock(&s2mpb02->i2c_lock);
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ret = i2c_smbus_read_byte_data(i2c, reg);
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if (ret >= 0) {
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u8 old_val = ret & 0xff;
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u8 new_val = (val & mask) | (old_val & (~mask));
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ret = i2c_smbus_write_byte_data(i2c, reg, new_val);
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}
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mutex_unlock(&s2mpb02->i2c_lock);
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return ret;
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}
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EXPORT_SYMBOL_GPL(s2mpb02_update_reg);
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static int s2mpb02_i2c_pinctrl_init(struct s2mpb02_dev *s2mpb02)
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{
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int retval;
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/* Get pinctrl if target uses pinctrl */
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s2mpb02->max_pinctrl = devm_pinctrl_get(s2mpb02->dev);
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if (IS_ERR_OR_NULL(s2mpb02->max_pinctrl)) {
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dev_dbg(s2mpb02->dev, "Target does not use pinctrl\n");
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retval = PTR_ERR(s2mpb02->max_pinctrl);
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s2mpb02->max_pinctrl = NULL;
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return retval;
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}
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s2mpb02->gpio_state_active
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= pinctrl_lookup_state(s2mpb02->max_pinctrl,
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"s2mpb02_interrupt_pins_active");
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if (IS_ERR_OR_NULL(s2mpb02->gpio_state_active)) {
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dev_dbg(s2mpb02->dev, "Can not get ts default pinstate\n");
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retval = PTR_ERR(s2mpb02->gpio_state_active);
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s2mpb02->max_pinctrl = NULL;
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return retval;
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}
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s2mpb02->gpio_state_suspend
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= pinctrl_lookup_state(s2mpb02->max_pinctrl,
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"s2mpb02_interrupt_pins_suspend");
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if (IS_ERR_OR_NULL(s2mpb02->gpio_state_suspend)) {
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dev_dbg(s2mpb02->dev,
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"Can not get ts sleep pinstate\n");
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retval = PTR_ERR(s2mpb02->gpio_state_suspend);
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s2mpb02->max_pinctrl = NULL;
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return retval;
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}
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return 0;
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}
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static int s2mpb02_i2c_pinctrl_select(struct s2mpb02_dev *s2mpb02, bool on)
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{
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struct pinctrl_state *pins_state;
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int ret;
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pins_state = on ? s2mpb02->gpio_state_active
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: s2mpb02->gpio_state_suspend;
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if (!IS_ERR_OR_NULL(pins_state)) {
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ret = pinctrl_select_state(s2mpb02->max_pinctrl, pins_state);
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if (ret) {
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pr_err("can not set %s pins\n",
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on ? "s2mpb02_interrupt_pins_active"
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: "s2mpb02_interrupt_pins_suspend");
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return ret;
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}
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} else
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pr_err("not a valid '%s' pinstate\n",
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on ? "s2mpb02_interrupt_pins_active"
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: "s2mpb02_interrupt_pins_suspend");
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return 0;
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}
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#if defined(CONFIG_OF)
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static int of_s2mpb02_dt(struct device *dev, struct s2mpb02_platform_data *pdata)
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{
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struct device_node *np_s2mpb02 = dev->of_node;
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if(!np_s2mpb02)
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return -EINVAL;
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pdata->irq_gpio = of_get_named_gpio(np_s2mpb02, "s2mpb02,irq-gpio", 0);
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pdata->wakeup = of_property_read_bool(np_s2mpb02, "s2mpb02,wakeup");
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return 0;
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}
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#else
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static int of_s2mpb02_dt(struct device *dev, struct s2mpb02_platform_data *pdata)
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{
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return 0;
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}
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#endif /* CONFIG_OF */
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static int s2mpb02_i2c_probe(struct i2c_client *i2c,
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const struct i2c_device_id *dev_id)
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{
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struct s2mpb02_dev *s2mpb02;
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struct s2mpb02_platform_data *pdata = i2c->dev.platform_data;
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int ret = 0;
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u8 reg_data;
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pr_err("<%s> start\n", __func__);
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s2mpb02 = kzalloc(sizeof(struct s2mpb02_dev), GFP_KERNEL);
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if (!s2mpb02) {
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dev_err(&i2c->dev, "%s: Failed to alloc mem for s2mpb02\n", __func__);
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return -ENOMEM;
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}
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if (i2c->dev.of_node) {
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pdata = devm_kzalloc(&i2c->dev, sizeof(struct s2mpb02_platform_data),
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GFP_KERNEL);
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if (!pdata) {
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dev_err(&i2c->dev, "Failed to allocate memory \n");
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ret = -ENOMEM;
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goto err;
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}
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ret = of_s2mpb02_dt(&i2c->dev, pdata);
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if (ret < 0){
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dev_err(&i2c->dev, "Failed to get device of_node \n");
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goto err;
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}
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i2c->dev.platform_data = pdata;
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} else
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pdata = i2c->dev.platform_data;
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s2mpb02->dev = &i2c->dev;
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s2mpb02->i2c = i2c;
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s2mpb02->irq = i2c->irq;
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if (pdata) {
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s2mpb02->pdata = pdata;
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pdata->irq_base = irq_alloc_descs(-1, 0, S2MPB02_IRQ_NR, -1);
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if (pdata->irq_base < 0) {
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pr_err("%s:%s irq_alloc_descs Fail! ret(%d)\n",
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MFD_DEV_NAME, __func__, pdata->irq_base);
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ret = -EINVAL;
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goto err;
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} else
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s2mpb02->irq_base = pdata->irq_base;
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s2mpb02->irq_gpio = pdata->irq_gpio;
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s2mpb02->wakeup = pdata->wakeup;
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} else {
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ret = -EINVAL;
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goto err;
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}
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ret = s2mpb02_i2c_pinctrl_init(s2mpb02);
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if (!ret && s2mpb02->max_pinctrl) {
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ret = s2mpb02_i2c_pinctrl_select(s2mpb02, true);
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if (ret < 0)
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goto err;
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}
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mutex_init(&s2mpb02->i2c_lock);
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i2c_set_clientdata(i2c, s2mpb02);
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if (s2mpb02_read_reg(s2mpb02->i2c, S2MPB02_REG_ID, ®_data) < 0) {
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pr_err("device not found on this channel!!\n");
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ret = -ENODEV;
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} else {
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pr_err("%s: device id 0x%x is found\n",
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__func__, reg_data);
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}
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ret = s2mpb02_irq_init(s2mpb02);
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if (ret < 0)
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goto err_irq_init;
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ret = mfd_add_devices(s2mpb02->dev, -1, s2mpb02_devs,
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ARRAY_SIZE(s2mpb02_devs), NULL, 0, NULL);
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if (ret < 0)
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goto err_mfd;
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device_init_wakeup(s2mpb02->dev, pdata->wakeup);
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pr_err("<%s> end\n", __func__);
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return ret;
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err_mfd:
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mfd_remove_devices(s2mpb02->dev);
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err_irq_init:
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mutex_destroy(&s2mpb02->i2c_lock);
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err:
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kfree(s2mpb02);
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return ret;
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}
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static int s2mpb02_i2c_remove(struct i2c_client *i2c)
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{
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struct s2mpb02_dev *s2mpb02 = i2c_get_clientdata(i2c);
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mfd_remove_devices(s2mpb02->dev);
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kfree(s2mpb02);
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return 0;
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}
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static const struct i2c_device_id s2mpb02_i2c_id[] = {
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{ MFD_DEV_NAME, TYPE_S2MPB02 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, s2mpb02_i2c_id);
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#if defined(CONFIG_OF)
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static struct of_device_id s2mpb02_i2c_dt_ids[] = {
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{ .compatible = "samsung,s2mpb02" },
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{},
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};
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MODULE_DEVICE_TABLE(of, s2mpb02_i2c_dt_ids);
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#endif /* CONFIG_OF */
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#if defined(CONFIG_PM)
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static int s2mpb02_suspend(struct device *dev)
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{
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struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
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struct s2mpb02_dev *s2mpb02 = i2c_get_clientdata(i2c);
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if (device_may_wakeup(dev))
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enable_irq_wake(s2mpb02->irq);
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disable_irq(s2mpb02->irq);
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return 0;
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}
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static int s2mpb02_resume(struct device *dev)
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{
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struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
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struct s2mpb02_dev *s2mpb02 = i2c_get_clientdata(i2c);
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if (device_may_wakeup(dev))
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disable_irq_wake(s2mpb02->irq);
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enable_irq(s2mpb02->irq);
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return 0;
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}
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#else
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#define s2mpb02_suspend NULL
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#define s2mpb02_resume NULL
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#endif /* CONFIG_PM */
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const struct dev_pm_ops s2mpb02_pm = {
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.suspend = s2mpb02_suspend,
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.resume = s2mpb02_resume,
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};
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static struct i2c_driver s2mpb02_i2c_driver = {
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.driver = {
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.name = MFD_DEV_NAME,
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.owner = THIS_MODULE,
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#if defined(CONFIG_PM)
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.pm = &s2mpb02_pm,
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#endif /* CONFIG_PM */
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#if defined(CONFIG_OF)
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.of_match_table = s2mpb02_i2c_dt_ids,
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#endif /* CONFIG_OF */
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},
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.probe = s2mpb02_i2c_probe,
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.remove = s2mpb02_i2c_remove,
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.id_table = s2mpb02_i2c_id,
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};
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static int __init s2mpb02_i2c_init(void)
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{
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pr_info("%s:%s\n", MFD_DEV_NAME, __func__);
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return i2c_add_driver(&s2mpb02_i2c_driver);
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}
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/* init early so consumer devices can complete system boot */
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subsys_initcall(s2mpb02_i2c_init);
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static void __exit s2mpb02_i2c_exit(void)
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{
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i2c_del_driver(&s2mpb02_i2c_driver);
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}
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module_exit(s2mpb02_i2c_exit);
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MODULE_DESCRIPTION("SAMSUNG s2mpb02 multi-function core driver");
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MODULE_AUTHOR("XXX <xxx@samsung.com>");
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MODULE_LICENSE("GPL"); |