Jonghwa Lee | dae8a96 | 2012-06-25 10:34:36 +0200 | [diff] [blame] | 1 | /* |
| 2 | * max77686.c - mfd core driver for the Maxim 77686 |
| 3 | * |
| 4 | * Copyright (C) 2012 Samsung Electronics |
| 5 | * Chiwoong Byun <woong.byun@smasung.com> |
| 6 | * Jonghwa Lee <jonghwa3.lee@samsung.com> |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License as published by |
| 10 | * the Free Software Foundation; either version 2 of the License, or |
| 11 | * (at your option) any later version. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU General Public License |
| 19 | * along with this program; if not, write to the Free Software |
| 20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 21 | * |
| 22 | * This driver is based on max8997.c |
| 23 | */ |
| 24 | |
| 25 | #include <linux/export.h> |
| 26 | #include <linux/slab.h> |
| 27 | #include <linux/i2c.h> |
| 28 | #include <linux/pm_runtime.h> |
| 29 | #include <linux/module.h> |
Jonghwa Lee | dae8a96 | 2012-06-25 10:34:36 +0200 | [diff] [blame] | 30 | #include <linux/mfd/core.h> |
| 31 | #include <linux/mfd/max77686.h> |
| 32 | #include <linux/mfd/max77686-private.h> |
| 33 | #include <linux/err.h> |
| 34 | |
| 35 | #define I2C_ADDR_RTC (0x0C >> 1) |
| 36 | |
| 37 | static struct mfd_cell max77686_devs[] = { |
| 38 | { .name = "max77686-pmic", }, |
| 39 | { .name = "max77686-rtc", }, |
Olof Johansson | c0fa7e1 | 2013-05-10 10:11:59 -0700 | [diff] [blame] | 40 | { .name = "max77686-clk", }, |
Jonghwa Lee | dae8a96 | 2012-06-25 10:34:36 +0200 | [diff] [blame] | 41 | }; |
| 42 | |
| 43 | static struct regmap_config max77686_regmap_config = { |
| 44 | .reg_bits = 8, |
| 45 | .val_bits = 8, |
| 46 | }; |
| 47 | |
Yadwinder Singh Brar | c1516f8 | 2012-07-06 17:02:55 +0530 | [diff] [blame] | 48 | #ifdef CONFIG_OF |
Bill Pemberton | a9e9ce4 | 2012-11-19 13:24:21 -0500 | [diff] [blame] | 49 | static struct of_device_id max77686_pmic_dt_match[] = { |
Sachin Kamat | d1ac2c0 | 2013-03-26 10:13:36 +0530 | [diff] [blame] | 50 | {.compatible = "maxim,max77686", .data = NULL}, |
Axel Lin | 2984fc0 | 2012-07-09 22:29:00 +0800 | [diff] [blame] | 51 | {}, |
| 52 | }; |
| 53 | |
Yadwinder Singh Brar | c1516f8 | 2012-07-06 17:02:55 +0530 | [diff] [blame] | 54 | static struct max77686_platform_data *max77686_i2c_parse_dt_pdata(struct device |
| 55 | *dev) |
| 56 | { |
| 57 | struct max77686_platform_data *pd; |
| 58 | |
| 59 | pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL); |
| 60 | if (!pd) { |
| 61 | dev_err(dev, "could not allocate memory for pdata\n"); |
| 62 | return NULL; |
| 63 | } |
| 64 | |
| 65 | dev->platform_data = pd; |
| 66 | return pd; |
| 67 | } |
| 68 | #else |
| 69 | static struct max77686_platform_data *max77686_i2c_parse_dt_pdata(struct device |
| 70 | *dev) |
| 71 | { |
| 72 | return 0; |
| 73 | } |
| 74 | #endif |
| 75 | |
Jonghwa Lee | dae8a96 | 2012-06-25 10:34:36 +0200 | [diff] [blame] | 76 | static int max77686_i2c_probe(struct i2c_client *i2c, |
| 77 | const struct i2c_device_id *id) |
| 78 | { |
Yadwinder Singh Brar | c1516f8 | 2012-07-06 17:02:55 +0530 | [diff] [blame] | 79 | struct max77686_dev *max77686 = NULL; |
Jonghwa Lee | dae8a96 | 2012-06-25 10:34:36 +0200 | [diff] [blame] | 80 | struct max77686_platform_data *pdata = i2c->dev.platform_data; |
| 81 | unsigned int data; |
| 82 | int ret = 0; |
| 83 | |
Yadwinder Singh Brar | c1516f8 | 2012-07-06 17:02:55 +0530 | [diff] [blame] | 84 | if (i2c->dev.of_node) |
| 85 | pdata = max77686_i2c_parse_dt_pdata(&i2c->dev); |
| 86 | |
| 87 | if (!pdata) { |
Yadwinder Singh Brar | c1516f8 | 2012-07-06 17:02:55 +0530 | [diff] [blame] | 88 | dev_err(&i2c->dev, "No platform data found.\n"); |
Lee Jones | 742413a | 2013-05-23 16:25:16 +0100 | [diff] [blame] | 89 | return -EIO; |
Yadwinder Singh Brar | c1516f8 | 2012-07-06 17:02:55 +0530 | [diff] [blame] | 90 | } |
| 91 | |
Lee Jones | 742413a | 2013-05-23 16:25:16 +0100 | [diff] [blame] | 92 | max77686 = devm_kzalloc(&i2c->dev, |
| 93 | sizeof(struct max77686_dev), GFP_KERNEL); |
Jonghwa Lee | dae8a96 | 2012-06-25 10:34:36 +0200 | [diff] [blame] | 94 | if (max77686 == NULL) |
| 95 | return -ENOMEM; |
| 96 | |
Jonghwa Lee | dae8a96 | 2012-06-25 10:34:36 +0200 | [diff] [blame] | 97 | i2c_set_clientdata(i2c, max77686); |
| 98 | max77686->dev = &i2c->dev; |
| 99 | max77686->i2c = i2c; |
| 100 | max77686->type = id->driver_data; |
| 101 | |
Jonghwa Lee | dae8a96 | 2012-06-25 10:34:36 +0200 | [diff] [blame] | 102 | max77686->wakeup = pdata->wakeup; |
| 103 | max77686->irq_gpio = pdata->irq_gpio; |
Yadwinder Singh Brar | 2b40459 | 2012-07-09 13:21:45 +0200 | [diff] [blame] | 104 | max77686->irq = i2c->irq; |
Jonghwa Lee | dae8a96 | 2012-06-25 10:34:36 +0200 | [diff] [blame] | 105 | |
Axel Lin | 136d982 | 2012-12-25 00:16:43 +0800 | [diff] [blame] | 106 | max77686->regmap = regmap_init_i2c(i2c, &max77686_regmap_config); |
| 107 | if (IS_ERR(max77686->regmap)) { |
| 108 | ret = PTR_ERR(max77686->regmap); |
| 109 | dev_err(max77686->dev, "Failed to allocate register map: %d\n", |
| 110 | ret); |
Axel Lin | 136d982 | 2012-12-25 00:16:43 +0800 | [diff] [blame] | 111 | return ret; |
| 112 | } |
| 113 | |
Jonghwa Lee | dae8a96 | 2012-06-25 10:34:36 +0200 | [diff] [blame] | 114 | if (regmap_read(max77686->regmap, |
| 115 | MAX77686_REG_DEVICE_ID, &data) < 0) { |
| 116 | dev_err(max77686->dev, |
| 117 | "device not found on this channel (this is not an error)\n"); |
Lee Jones | 742413a | 2013-05-23 16:25:16 +0100 | [diff] [blame] | 118 | return -ENODEV; |
Jonghwa Lee | dae8a96 | 2012-06-25 10:34:36 +0200 | [diff] [blame] | 119 | } else |
| 120 | dev_info(max77686->dev, "device found\n"); |
| 121 | |
| 122 | max77686->rtc = i2c_new_dummy(i2c->adapter, I2C_ADDR_RTC); |
| 123 | i2c_set_clientdata(max77686->rtc, max77686); |
| 124 | |
| 125 | max77686_irq_init(max77686); |
| 126 | |
| 127 | ret = mfd_add_devices(max77686->dev, -1, max77686_devs, |
Mark Brown | 0848c94 | 2012-09-11 15:16:36 +0800 | [diff] [blame] | 128 | ARRAY_SIZE(max77686_devs), NULL, 0, NULL); |
Lee Jones | 742413a | 2013-05-23 16:25:16 +0100 | [diff] [blame] | 129 | if (ret < 0) { |
| 130 | mfd_remove_devices(max77686->dev); |
| 131 | i2c_unregister_device(max77686->rtc); |
| 132 | } |
Jonghwa Lee | dae8a96 | 2012-06-25 10:34:36 +0200 | [diff] [blame] | 133 | |
Jonghwa Lee | dae8a96 | 2012-06-25 10:34:36 +0200 | [diff] [blame] | 134 | return ret; |
| 135 | } |
| 136 | |
| 137 | static int max77686_i2c_remove(struct i2c_client *i2c) |
| 138 | { |
| 139 | struct max77686_dev *max77686 = i2c_get_clientdata(i2c); |
| 140 | |
| 141 | mfd_remove_devices(max77686->dev); |
| 142 | i2c_unregister_device(max77686->rtc); |
Jonghwa Lee | dae8a96 | 2012-06-25 10:34:36 +0200 | [diff] [blame] | 143 | |
| 144 | return 0; |
| 145 | } |
| 146 | |
| 147 | static const struct i2c_device_id max77686_i2c_id[] = { |
| 148 | { "max77686", TYPE_MAX77686 }, |
| 149 | { } |
| 150 | }; |
| 151 | MODULE_DEVICE_TABLE(i2c, max77686_i2c_id); |
| 152 | |
| 153 | static struct i2c_driver max77686_i2c_driver = { |
| 154 | .driver = { |
| 155 | .name = "max77686", |
| 156 | .owner = THIS_MODULE, |
Yadwinder Singh Brar | c1516f8 | 2012-07-06 17:02:55 +0530 | [diff] [blame] | 157 | .of_match_table = of_match_ptr(max77686_pmic_dt_match), |
Jonghwa Lee | dae8a96 | 2012-06-25 10:34:36 +0200 | [diff] [blame] | 158 | }, |
| 159 | .probe = max77686_i2c_probe, |
| 160 | .remove = max77686_i2c_remove, |
| 161 | .id_table = max77686_i2c_id, |
| 162 | }; |
| 163 | |
| 164 | static int __init max77686_i2c_init(void) |
| 165 | { |
| 166 | return i2c_add_driver(&max77686_i2c_driver); |
| 167 | } |
| 168 | /* init early so consumer devices can complete system boot */ |
| 169 | subsys_initcall(max77686_i2c_init); |
| 170 | |
| 171 | static void __exit max77686_i2c_exit(void) |
| 172 | { |
| 173 | i2c_del_driver(&max77686_i2c_driver); |
| 174 | } |
| 175 | module_exit(max77686_i2c_exit); |
| 176 | |
| 177 | MODULE_DESCRIPTION("MAXIM 77686 multi-function core driver"); |
| 178 | MODULE_AUTHOR("Chiwoong Byun <woong.byun@samsung.com>"); |
| 179 | MODULE_LICENSE("GPL"); |