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mfd: intel_soc_pmic: Core driver
This patch provides the common I2C driver code for Intel SoC PMICs. Signed-off-by: Yang, Bin <bin.yang@intel.com> Signed-off-by: Zhu, Lejun <lejun.zhu@linux.intel.com> Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Zhu, Lejun
Lee Jones
parent
7171511eae
commit
5165238460
3 changed files with 230 additions and 0 deletions
168
drivers/mfd/intel_soc_pmic_core.c
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168
drivers/mfd/intel_soc_pmic_core.c
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/*
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* intel_soc_pmic_core.c - Intel SoC PMIC MFD Driver
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*
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* Copyright (C) 2013, 2014 Intel Corporation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version
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* 2 as published by the Free Software Foundation.
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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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* Author: Yang, Bin <bin.yang@intel.com>
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* Author: Zhu, Lejun <lejun.zhu@linux.intel.com>
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*/
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#include <linux/module.h>
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#include <linux/mfd/core.h>
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#include <linux/i2c.h>
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#include <linux/interrupt.h>
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#include <linux/gpio/consumer.h>
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#include <linux/acpi.h>
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#include <linux/regmap.h>
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#include <linux/mfd/intel_soc_pmic.h>
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#include "intel_soc_pmic_core.h"
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/*
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* On some boards the PMIC interrupt may come from a GPIO line.
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* Try to lookup the ACPI table and see if such connection exists. If not,
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* return -ENOENT and use the IRQ provided by I2C.
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*/
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static int intel_soc_pmic_find_gpio_irq(struct device *dev)
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{
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struct gpio_desc *desc;
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int irq;
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desc = devm_gpiod_get_index(dev, "intel_soc_pmic", 0);
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if (IS_ERR(desc))
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return -ENOENT;
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irq = gpiod_to_irq(desc);
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if (irq < 0)
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dev_warn(dev, "Can't get irq: %d\n", irq);
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return irq;
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}
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static int intel_soc_pmic_i2c_probe(struct i2c_client *i2c,
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const struct i2c_device_id *i2c_id)
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{
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struct device *dev = &i2c->dev;
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const struct acpi_device_id *id;
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struct intel_soc_pmic_config *config;
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struct intel_soc_pmic *pmic;
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int ret;
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int irq;
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id = acpi_match_device(dev->driver->acpi_match_table, dev);
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if (!id || !id->driver_data)
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return -ENODEV;
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config = (struct intel_soc_pmic_config *)id->driver_data;
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pmic = devm_kzalloc(dev, sizeof(*pmic), GFP_KERNEL);
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dev_set_drvdata(dev, pmic);
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pmic->regmap = devm_regmap_init_i2c(i2c, config->regmap_config);
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irq = intel_soc_pmic_find_gpio_irq(dev);
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pmic->irq = (irq < 0) ? i2c->irq : irq;
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ret = regmap_add_irq_chip(pmic->regmap, pmic->irq,
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config->irq_flags | IRQF_ONESHOT,
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0, config->irq_chip,
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&pmic->irq_chip_data);
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if (ret)
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return ret;
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ret = enable_irq_wake(pmic->irq);
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if (ret)
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dev_warn(dev, "Can't enable IRQ as wake source: %d\n", ret);
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ret = mfd_add_devices(dev, -1, config->cell_dev,
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config->n_cell_devs, NULL, 0,
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regmap_irq_get_domain(pmic->irq_chip_data));
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if (ret)
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goto err_del_irq_chip;
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return 0;
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err_del_irq_chip:
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regmap_del_irq_chip(pmic->irq, pmic->irq_chip_data);
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return ret;
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}
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static int intel_soc_pmic_i2c_remove(struct i2c_client *i2c)
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{
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struct intel_soc_pmic *pmic = dev_get_drvdata(&i2c->dev);
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regmap_del_irq_chip(pmic->irq, pmic->irq_chip_data);
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mfd_remove_devices(&i2c->dev);
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return 0;
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}
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static void intel_soc_pmic_shutdown(struct i2c_client *i2c)
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{
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struct intel_soc_pmic *pmic = dev_get_drvdata(&i2c->dev);
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disable_irq(pmic->irq);
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return;
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}
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static int intel_soc_pmic_suspend(struct device *dev)
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{
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struct intel_soc_pmic *pmic = dev_get_drvdata(dev);
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disable_irq(pmic->irq);
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return 0;
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}
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static int intel_soc_pmic_resume(struct device *dev)
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{
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struct intel_soc_pmic *pmic = dev_get_drvdata(dev);
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enable_irq(pmic->irq);
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return 0;
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}
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static SIMPLE_DEV_PM_OPS(intel_soc_pmic_pm_ops, intel_soc_pmic_suspend,
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intel_soc_pmic_resume);
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static const struct i2c_device_id intel_soc_pmic_i2c_id[] = {
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, intel_soc_pmic_i2c_id);
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static struct acpi_device_id intel_soc_pmic_acpi_match[] = {
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{"INT33FD", (kernel_ulong_t)&intel_soc_pmic_config_crc},
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{ },
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};
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MODULE_DEVICE_TABLE(acpi, intel_soc_pmic_acpi_match);
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static struct i2c_driver intel_soc_pmic_i2c_driver = {
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.driver = {
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.name = "intel_soc_pmic_i2c",
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.owner = THIS_MODULE,
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.pm = &intel_soc_pmic_pm_ops,
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.acpi_match_table = ACPI_PTR(intel_soc_pmic_acpi_match),
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},
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.probe = intel_soc_pmic_i2c_probe,
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.remove = intel_soc_pmic_i2c_remove,
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.id_table = intel_soc_pmic_i2c_id,
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.shutdown = intel_soc_pmic_shutdown,
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};
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module_i2c_driver(intel_soc_pmic_i2c_driver);
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MODULE_DESCRIPTION("I2C driver for Intel SoC PMIC");
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MODULE_LICENSE("GPL v2");
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MODULE_AUTHOR("Yang, Bin <bin.yang@intel.com>");
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MODULE_AUTHOR("Zhu, Lejun <lejun.zhu@linux.intel.com>");
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32
drivers/mfd/intel_soc_pmic_core.h
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32
drivers/mfd/intel_soc_pmic_core.h
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/*
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* intel_soc_pmic_core.h - Intel SoC PMIC MFD Driver
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*
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* Copyright (C) 2012-2014 Intel Corporation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version
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* 2 as published by the Free Software Foundation.
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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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* Author: Yang, Bin <bin.yang@intel.com>
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* Author: Zhu, Lejun <lejun.zhu@linux.intel.com>
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*/
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#ifndef __INTEL_SOC_PMIC_CORE_H__
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#define __INTEL_SOC_PMIC_CORE_H__
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struct intel_soc_pmic_config {
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unsigned long irq_flags;
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struct mfd_cell *cell_dev;
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int n_cell_devs;
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struct regmap_config *regmap_config;
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struct regmap_irq_chip *irq_chip;
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};
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extern struct intel_soc_pmic_config intel_soc_pmic_config_crc;
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#endif /* __INTEL_SOC_PMIC_CORE_H__ */
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30
include/linux/mfd/intel_soc_pmic.h
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30
include/linux/mfd/intel_soc_pmic.h
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/*
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* intel_soc_pmic.h - Intel SoC PMIC Driver
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*
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* Copyright (C) 2012-2014 Intel Corporation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version
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* 2 as published by the Free Software Foundation.
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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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* Author: Yang, Bin <bin.yang@intel.com>
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* Author: Zhu, Lejun <lejun.zhu@linux.intel.com>
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*/
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#ifndef __INTEL_SOC_PMIC_H__
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#define __INTEL_SOC_PMIC_H__
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#include <linux/regmap.h>
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struct intel_soc_pmic {
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int irq;
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struct regmap *regmap;
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struct regmap_irq_chip_data *irq_chip_data;
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};
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#endif /* __INTEL_SOC_PMIC_H__ */
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