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| 1 | /* |
| 2 | * max8997_charger.c - Power supply consumer driver for the Maxim 8997/8966 |
| 3 | * |
| 4 | * Copyright (C) 2011 Samsung Electronics |
| 5 | * MyungJoo Ham <myungjoo.ham@samsung.com> |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License as published by |
| 9 | * the Free Software Foundation; either version 2 of the License, or |
| 10 | * (at your option) any later version. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License |
| 18 | * along with this program; if not, write to the Free Software |
| 19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 20 | */ |
| 21 | |
| 22 | #include <linux/err.h> |
| 23 | #include <linux/module.h> |
| 24 | #include <linux/slab.h> |
| 25 | #include <linux/platform_device.h> |
| 26 | #include <linux/power_supply.h> |
| 27 | #include <linux/mfd/max8997.h> |
| 28 | #include <linux/mfd/max8997-private.h> |
| 29 | |
| 30 | struct charger_data { |
| 31 | struct device *dev; |
| 32 | struct max8997_dev *iodev; |
| 33 | struct power_supply battery; |
| 34 | }; |
| 35 | |
| 36 | static enum power_supply_property max8997_battery_props[] = { |
| 37 | POWER_SUPPLY_PROP_STATUS, /* "FULL" or "NOT FULL" only. */ |
| 38 | POWER_SUPPLY_PROP_PRESENT, /* the presence of battery */ |
| 39 | POWER_SUPPLY_PROP_ONLINE, /* charger is active or not */ |
| 40 | }; |
| 41 | |
| 42 | /* Note that the charger control is done by a current regulator "CHARGER" */ |
| 43 | static int max8997_battery_get_property(struct power_supply *psy, |
| 44 | enum power_supply_property psp, |
| 45 | union power_supply_propval *val) |
| 46 | { |
| 47 | struct charger_data *charger = container_of(psy, |
| 48 | struct charger_data, battery); |
| 49 | struct i2c_client *i2c = charger->iodev->i2c; |
| 50 | int ret; |
| 51 | u8 reg; |
| 52 | |
| 53 | switch (psp) { |
| 54 | case POWER_SUPPLY_PROP_STATUS: |
| 55 | val->intval = 0; |
| 56 | ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, ®); |
| 57 | if (ret) |
| 58 | return ret; |
| 59 | if ((reg & (1 << 0)) == 0x1) |
| 60 | val->intval = POWER_SUPPLY_STATUS_FULL; |
| 61 | |
| 62 | break; |
| 63 | case POWER_SUPPLY_PROP_PRESENT: |
| 64 | val->intval = 0; |
| 65 | ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, ®); |
| 66 | if (ret) |
| 67 | return ret; |
| 68 | if ((reg & (1 << 2)) == 0x0) |
| 69 | val->intval = 1; |
| 70 | |
| 71 | break; |
| 72 | case POWER_SUPPLY_PROP_ONLINE: |
| 73 | val->intval = 0; |
| 74 | ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, ®); |
| 75 | if (ret) |
| 76 | return ret; |
| 77 | /* DCINOK */ |
| 78 | if (reg & (1 << 1)) |
| 79 | val->intval = 1; |
| 80 | |
| 81 | break; |
| 82 | default: |
| 83 | return -EINVAL; |
| 84 | } |
| 85 | |
| 86 | return 0; |
| 87 | } |
| 88 | |
| 89 | static __devinit int max8997_battery_probe(struct platform_device *pdev) |
| 90 | { |
| 91 | int ret = 0; |
| 92 | struct charger_data *charger; |
| 93 | struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent); |
| 94 | struct max8997_platform_data *pdata = dev_get_platdata(iodev->dev); |
| 95 | |
| 96 | if (!pdata) |
| 97 | return -EINVAL; |
| 98 | |
| 99 | if (pdata->eoc_mA) { |
| 100 | int val = (pdata->eoc_mA - 50) / 10; |
| 101 | if (val < 0) |
| 102 | val = 0; |
| 103 | if (val > 0xf) |
| 104 | val = 0xf; |
| 105 | |
| 106 | ret = max8997_update_reg(iodev->i2c, |
| 107 | MAX8997_REG_MBCCTRL5, val, 0xf); |
| 108 | if (ret < 0) { |
| 109 | dev_err(&pdev->dev, "Cannot use i2c bus.\n"); |
| 110 | return ret; |
| 111 | } |
| 112 | } |
| 113 | |
| 114 | switch (pdata->timeout) { |
| 115 | case 5: |
| 116 | ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1, |
| 117 | 0x2 << 4, 0x7 << 4); |
| 118 | break; |
| 119 | case 6: |
| 120 | ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1, |
| 121 | 0x3 << 4, 0x7 << 4); |
| 122 | break; |
| 123 | case 7: |
| 124 | ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1, |
| 125 | 0x4 << 4, 0x7 << 4); |
| 126 | break; |
| 127 | case 0: |
| 128 | ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1, |
| 129 | 0x7 << 4, 0x7 << 4); |
| 130 | break; |
| 131 | default: |
| 132 | dev_err(&pdev->dev, "incorrect timeout value (%d)\n", |
| 133 | pdata->timeout); |
| 134 | return -EINVAL; |
| 135 | } |
| 136 | if (ret < 0) { |
| 137 | dev_err(&pdev->dev, "Cannot use i2c bus.\n"); |
| 138 | return ret; |
| 139 | } |
| 140 | |
| 141 | charger = kzalloc(sizeof(struct charger_data), GFP_KERNEL); |
| 142 | if (charger == NULL) { |
| 143 | dev_err(&pdev->dev, "Cannot allocate memory.\n"); |
| 144 | return -ENOMEM; |
| 145 | } |
| 146 | |
| 147 | platform_set_drvdata(pdev, charger); |
| 148 | |
| 149 | charger->battery.name = "max8997_pmic"; |
| 150 | charger->battery.type = POWER_SUPPLY_TYPE_BATTERY; |
| 151 | charger->battery.get_property = max8997_battery_get_property; |
| 152 | charger->battery.properties = max8997_battery_props; |
| 153 | charger->battery.num_properties = ARRAY_SIZE(max8997_battery_props); |
| 154 | |
| 155 | charger->dev = &pdev->dev; |
| 156 | charger->iodev = iodev; |
| 157 | |
| 158 | ret = power_supply_register(&pdev->dev, &charger->battery); |
| 159 | if (ret) { |
| 160 | dev_err(&pdev->dev, "failed: power supply register\n"); |
| 161 | goto err; |
| 162 | } |
| 163 | |
| 164 | return 0; |
| 165 | err: |
| 166 | kfree(charger); |
| 167 | return ret; |
| 168 | } |
| 169 | |
| 170 | static int __devexit max8997_battery_remove(struct platform_device *pdev) |
| 171 | { |
| 172 | struct charger_data *charger = platform_get_drvdata(pdev); |
| 173 | |
| 174 | power_supply_unregister(&charger->battery); |
| 175 | kfree(charger); |
| 176 | return 0; |
| 177 | } |
| 178 | |
| 179 | static const struct platform_device_id max8997_battery_id[] = { |
| 180 | { "max8997-battery", 0 }, |
| 181 | { } |
| 182 | }; |
| 183 | |
| 184 | static struct platform_driver max8997_battery_driver = { |
| 185 | .driver = { |
| 186 | .name = "max8997-battery", |
| 187 | .owner = THIS_MODULE, |
| 188 | }, |
| 189 | .probe = max8997_battery_probe, |
| 190 | .remove = __devexit_p(max8997_battery_remove), |
| 191 | .id_table = max8997_battery_id, |
| 192 | }; |
| 193 | |
| 194 | static int __init max8997_battery_init(void) |
| 195 | { |
| 196 | return platform_driver_register(&max8997_battery_driver); |
| 197 | } |
| 198 | subsys_initcall(max8997_battery_init); |
| 199 | |
| 200 | static void __exit max8997_battery_cleanup(void) |
| 201 | { |
| 202 | platform_driver_unregister(&max8997_battery_driver); |
| 203 | } |
| 204 | module_exit(max8997_battery_cleanup); |
| 205 | |
| 206 | MODULE_DESCRIPTION("MAXIM 8997/8966 battery control driver"); |
| 207 | MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>"); |
| 208 | MODULE_LICENSE("GPL"); |
| 209 |
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