Zhu, Lejun | 5165238 | 2014-06-03 13:26:02 +0800 | [diff] [blame] | 1 | /* |
| 2 | * intel_soc_pmic_core.c - Intel SoC PMIC MFD Driver |
| 3 | * |
| 4 | * Copyright (C) 2013, 2014 Intel Corporation. All rights reserved. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU General Public License version |
| 8 | * 2 as published by the Free Software Foundation. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * Author: Yang, Bin <bin.yang@intel.com> |
| 16 | * Author: Zhu, Lejun <lejun.zhu@linux.intel.com> |
| 17 | */ |
| 18 | |
| 19 | #include <linux/module.h> |
| 20 | #include <linux/mfd/core.h> |
| 21 | #include <linux/i2c.h> |
| 22 | #include <linux/interrupt.h> |
| 23 | #include <linux/gpio/consumer.h> |
| 24 | #include <linux/acpi.h> |
| 25 | #include <linux/regmap.h> |
| 26 | #include <linux/mfd/intel_soc_pmic.h> |
| 27 | #include "intel_soc_pmic_core.h" |
| 28 | |
| 29 | /* |
| 30 | * On some boards the PMIC interrupt may come from a GPIO line. |
| 31 | * Try to lookup the ACPI table and see if such connection exists. If not, |
| 32 | * return -ENOENT and use the IRQ provided by I2C. |
| 33 | */ |
| 34 | static int intel_soc_pmic_find_gpio_irq(struct device *dev) |
| 35 | { |
| 36 | struct gpio_desc *desc; |
| 37 | int irq; |
| 38 | |
| 39 | desc = devm_gpiod_get_index(dev, "intel_soc_pmic", 0); |
| 40 | if (IS_ERR(desc)) |
| 41 | return -ENOENT; |
| 42 | |
| 43 | irq = gpiod_to_irq(desc); |
| 44 | if (irq < 0) |
| 45 | dev_warn(dev, "Can't get irq: %d\n", irq); |
| 46 | |
| 47 | return irq; |
| 48 | } |
| 49 | |
| 50 | static int intel_soc_pmic_i2c_probe(struct i2c_client *i2c, |
| 51 | const struct i2c_device_id *i2c_id) |
| 52 | { |
| 53 | struct device *dev = &i2c->dev; |
| 54 | const struct acpi_device_id *id; |
| 55 | struct intel_soc_pmic_config *config; |
| 56 | struct intel_soc_pmic *pmic; |
| 57 | int ret; |
| 58 | int irq; |
| 59 | |
| 60 | id = acpi_match_device(dev->driver->acpi_match_table, dev); |
| 61 | if (!id || !id->driver_data) |
| 62 | return -ENODEV; |
| 63 | |
| 64 | config = (struct intel_soc_pmic_config *)id->driver_data; |
| 65 | |
| 66 | pmic = devm_kzalloc(dev, sizeof(*pmic), GFP_KERNEL); |
| 67 | dev_set_drvdata(dev, pmic); |
| 68 | |
| 69 | pmic->regmap = devm_regmap_init_i2c(i2c, config->regmap_config); |
| 70 | |
| 71 | irq = intel_soc_pmic_find_gpio_irq(dev); |
| 72 | pmic->irq = (irq < 0) ? i2c->irq : irq; |
| 73 | |
| 74 | ret = regmap_add_irq_chip(pmic->regmap, pmic->irq, |
| 75 | config->irq_flags | IRQF_ONESHOT, |
| 76 | 0, config->irq_chip, |
| 77 | &pmic->irq_chip_data); |
| 78 | if (ret) |
| 79 | return ret; |
| 80 | |
| 81 | ret = enable_irq_wake(pmic->irq); |
| 82 | if (ret) |
| 83 | dev_warn(dev, "Can't enable IRQ as wake source: %d\n", ret); |
| 84 | |
| 85 | ret = mfd_add_devices(dev, -1, config->cell_dev, |
| 86 | config->n_cell_devs, NULL, 0, |
| 87 | regmap_irq_get_domain(pmic->irq_chip_data)); |
| 88 | if (ret) |
| 89 | goto err_del_irq_chip; |
| 90 | |
| 91 | return 0; |
| 92 | |
| 93 | err_del_irq_chip: |
| 94 | regmap_del_irq_chip(pmic->irq, pmic->irq_chip_data); |
| 95 | return ret; |
| 96 | } |
| 97 | |
| 98 | static int intel_soc_pmic_i2c_remove(struct i2c_client *i2c) |
| 99 | { |
| 100 | struct intel_soc_pmic *pmic = dev_get_drvdata(&i2c->dev); |
| 101 | |
| 102 | regmap_del_irq_chip(pmic->irq, pmic->irq_chip_data); |
| 103 | |
| 104 | mfd_remove_devices(&i2c->dev); |
| 105 | |
| 106 | return 0; |
| 107 | } |
| 108 | |
| 109 | static void intel_soc_pmic_shutdown(struct i2c_client *i2c) |
| 110 | { |
| 111 | struct intel_soc_pmic *pmic = dev_get_drvdata(&i2c->dev); |
| 112 | |
| 113 | disable_irq(pmic->irq); |
| 114 | |
| 115 | return; |
| 116 | } |
| 117 | |
| 118 | static int intel_soc_pmic_suspend(struct device *dev) |
| 119 | { |
| 120 | struct intel_soc_pmic *pmic = dev_get_drvdata(dev); |
| 121 | |
| 122 | disable_irq(pmic->irq); |
| 123 | |
| 124 | return 0; |
| 125 | } |
| 126 | |
| 127 | static int intel_soc_pmic_resume(struct device *dev) |
| 128 | { |
| 129 | struct intel_soc_pmic *pmic = dev_get_drvdata(dev); |
| 130 | |
| 131 | enable_irq(pmic->irq); |
| 132 | |
| 133 | return 0; |
| 134 | } |
| 135 | |
| 136 | static SIMPLE_DEV_PM_OPS(intel_soc_pmic_pm_ops, intel_soc_pmic_suspend, |
| 137 | intel_soc_pmic_resume); |
| 138 | |
| 139 | static const struct i2c_device_id intel_soc_pmic_i2c_id[] = { |
| 140 | { } |
| 141 | }; |
| 142 | MODULE_DEVICE_TABLE(i2c, intel_soc_pmic_i2c_id); |
| 143 | |
Lee Jones | 52764fd | 2014-07-02 11:30:12 +0100 | [diff] [blame] | 144 | #if defined(CONFIG_ACPI) |
Zhu, Lejun | 5165238 | 2014-06-03 13:26:02 +0800 | [diff] [blame] | 145 | static struct acpi_device_id intel_soc_pmic_acpi_match[] = { |
| 146 | {"INT33FD", (kernel_ulong_t)&intel_soc_pmic_config_crc}, |
| 147 | { }, |
| 148 | }; |
| 149 | MODULE_DEVICE_TABLE(acpi, intel_soc_pmic_acpi_match); |
Lee Jones | 52764fd | 2014-07-02 11:30:12 +0100 | [diff] [blame] | 150 | #endif |
Zhu, Lejun | 5165238 | 2014-06-03 13:26:02 +0800 | [diff] [blame] | 151 | |
| 152 | static struct i2c_driver intel_soc_pmic_i2c_driver = { |
| 153 | .driver = { |
| 154 | .name = "intel_soc_pmic_i2c", |
| 155 | .owner = THIS_MODULE, |
| 156 | .pm = &intel_soc_pmic_pm_ops, |
| 157 | .acpi_match_table = ACPI_PTR(intel_soc_pmic_acpi_match), |
| 158 | }, |
| 159 | .probe = intel_soc_pmic_i2c_probe, |
| 160 | .remove = intel_soc_pmic_i2c_remove, |
| 161 | .id_table = intel_soc_pmic_i2c_id, |
| 162 | .shutdown = intel_soc_pmic_shutdown, |
| 163 | }; |
| 164 | |
| 165 | module_i2c_driver(intel_soc_pmic_i2c_driver); |
| 166 | |
| 167 | MODULE_DESCRIPTION("I2C driver for Intel SoC PMIC"); |
| 168 | MODULE_LICENSE("GPL v2"); |
| 169 | MODULE_AUTHOR("Yang, Bin <bin.yang@intel.com>"); |
| 170 | MODULE_AUTHOR("Zhu, Lejun <lejun.zhu@linux.intel.com>"); |