diff options
Diffstat (limited to 'drivers/mfd/intel_soc_pmic_core.c')
| -rw-r--r-- | drivers/mfd/intel_soc_pmic_core.c | 170 |
1 files changed, 170 insertions, 0 deletions
diff --git a/drivers/mfd/intel_soc_pmic_core.c b/drivers/mfd/intel_soc_pmic_core.c new file mode 100644 index 000000000000..2720922f90b4 --- /dev/null +++ b/drivers/mfd/intel_soc_pmic_core.c @@ -0,0 +1,170 @@ +/* + * intel_soc_pmic_core.c - Intel SoC PMIC MFD Driver + * + * Copyright (C) 2013, 2014 Intel Corporation. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License version + * 2 as published by the Free Software Foundation. + * + * 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. + * + * Author: Yang, Bin <bin.yang@intel.com> + * Author: Zhu, Lejun <lejun.zhu@linux.intel.com> + */ + +#include <linux/module.h> +#include <linux/mfd/core.h> +#include <linux/i2c.h> +#include <linux/interrupt.h> +#include <linux/gpio/consumer.h> +#include <linux/acpi.h> +#include <linux/regmap.h> +#include <linux/mfd/intel_soc_pmic.h> +#include "intel_soc_pmic_core.h" + +/* + * On some boards the PMIC interrupt may come from a GPIO line. + * Try to lookup the ACPI table and see if such connection exists. If not, + * return -ENOENT and use the IRQ provided by I2C. + */ +static int intel_soc_pmic_find_gpio_irq(struct device *dev) +{ + struct gpio_desc *desc; + int irq; + + desc = devm_gpiod_get_index(dev, "intel_soc_pmic", 0); + if (IS_ERR(desc)) + return -ENOENT; + + irq = gpiod_to_irq(desc); + if (irq < 0) + dev_warn(dev, "Can't get irq: %d\n", irq); + + return irq; +} + +static int intel_soc_pmic_i2c_probe(struct i2c_client *i2c, + const struct i2c_device_id *i2c_id) +{ + struct device *dev = &i2c->dev; + const struct acpi_device_id *id; + struct intel_soc_pmic_config *config; + struct intel_soc_pmic *pmic; + int ret; + int irq; + + id = acpi_match_device(dev->driver->acpi_match_table, dev); + if (!id || !id->driver_data) + return -ENODEV; + + config = (struct intel_soc_pmic_config *)id->driver_data; + + pmic = devm_kzalloc(dev, sizeof(*pmic), GFP_KERNEL); + dev_set_drvdata(dev, pmic); + + pmic->regmap = devm_regmap_init_i2c(i2c, config->regmap_config); + + irq = intel_soc_pmic_find_gpio_irq(dev); + pmic->irq = (irq < 0) ? i2c->irq : irq; + + ret = regmap_add_irq_chip(pmic->regmap, pmic->irq, + config->irq_flags | IRQF_ONESHOT, + 0, config->irq_chip, + &pmic->irq_chip_data); + if (ret) + return ret; + + ret = enable_irq_wake(pmic->irq); + if (ret) + dev_warn(dev, "Can't enable IRQ as wake source: %d\n", ret); + + ret = mfd_add_devices(dev, -1, config->cell_dev, + config->n_cell_devs, NULL, 0, + regmap_irq_get_domain(pmic->irq_chip_data)); + if (ret) + goto err_del_irq_chip; + + return 0; + +err_del_irq_chip: + regmap_del_irq_chip(pmic->irq, pmic->irq_chip_data); + return ret; +} + +static int intel_soc_pmic_i2c_remove(struct i2c_client *i2c) +{ + struct intel_soc_pmic *pmic = dev_get_drvdata(&i2c->dev); + + regmap_del_irq_chip(pmic->irq, pmic->irq_chip_data); + + mfd_remove_devices(&i2c->dev); + + return 0; +} + +static void intel_soc_pmic_shutdown(struct i2c_client *i2c) +{ + struct intel_soc_pmic *pmic = dev_get_drvdata(&i2c->dev); + + disable_irq(pmic->irq); + + return; +} + +static int intel_soc_pmic_suspend(struct device *dev) +{ + struct intel_soc_pmic *pmic = dev_get_drvdata(dev); + + disable_irq(pmic->irq); + + return 0; +} + +static int intel_soc_pmic_resume(struct device *dev) +{ + struct intel_soc_pmic *pmic = dev_get_drvdata(dev); + + enable_irq(pmic->irq); + + return 0; +} + +static SIMPLE_DEV_PM_OPS(intel_soc_pmic_pm_ops, intel_soc_pmic_suspend, + intel_soc_pmic_resume); + +static const struct i2c_device_id intel_soc_pmic_i2c_id[] = { + { } +}; +MODULE_DEVICE_TABLE(i2c, intel_soc_pmic_i2c_id); + +#if defined(CONFIG_ACPI) +static struct acpi_device_id intel_soc_pmic_acpi_match[] = { + {"INT33FD", (kernel_ulong_t)&intel_soc_pmic_config_crc}, + { }, +}; +MODULE_DEVICE_TABLE(acpi, intel_soc_pmic_acpi_match); +#endif + +static struct i2c_driver intel_soc_pmic_i2c_driver = { + .driver = { + .name = "intel_soc_pmic_i2c", + .owner = THIS_MODULE, + .pm = &intel_soc_pmic_pm_ops, + .acpi_match_table = ACPI_PTR(intel_soc_pmic_acpi_match), + }, + .probe = intel_soc_pmic_i2c_probe, + .remove = intel_soc_pmic_i2c_remove, + .id_table = intel_soc_pmic_i2c_id, + .shutdown = intel_soc_pmic_shutdown, +}; + +module_i2c_driver(intel_soc_pmic_i2c_driver); + +MODULE_DESCRIPTION("I2C driver for Intel SoC PMIC"); +MODULE_LICENSE("GPL v2"); +MODULE_AUTHOR("Yang, Bin <bin.yang@intel.com>"); +MODULE_AUTHOR("Zhu, Lejun <lejun.zhu@linux.intel.com>"); |