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| 1 | /* |
| 2 | * Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de> |
| 3 | * Driver for chargers which report their online status through a GPIO pin |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License as published by the |
| 7 | * Free Software Foundation; either version 2 of the License, or (at your |
| 8 | * option) any later version. |
| 9 | * |
| 10 | * You should have received a copy of the GNU General Public License along |
| 11 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 12 | * 675 Mass Ave, Cambridge, MA 02139, USA. |
| 13 | * |
| 14 | */ |
| 15 | |
| 16 | #include <linux/device.h> |
| 17 | #include <linux/gpio.h> |
| 18 | #include <linux/init.h> |
| 19 | #include <linux/interrupt.h> |
| 20 | #include <linux/kernel.h> |
| 21 | #include <linux/module.h> |
| 22 | #include <linux/platform_device.h> |
| 23 | #include <linux/power_supply.h> |
| 24 | #include <linux/slab.h> |
| 25 | |
| 26 | #include <linux/power/gpio-charger.h> |
| 27 | |
| 28 | struct gpio_charger { |
| 29 | const struct gpio_charger_platform_data *pdata; |
| 30 | unsigned int irq; |
| 31 | |
| 32 | struct power_supply charger; |
| 33 | }; |
| 34 | |
| 35 | static irqreturn_t gpio_charger_irq(int irq, void *devid) |
| 36 | { |
| 37 | struct power_supply *charger = devid; |
| 38 | |
| 39 | power_supply_changed(charger); |
| 40 | |
| 41 | return IRQ_HANDLED; |
| 42 | } |
| 43 | |
| 44 | static inline struct gpio_charger *psy_to_gpio_charger(struct power_supply *psy) |
| 45 | { |
| 46 | return container_of(psy, struct gpio_charger, charger); |
| 47 | } |
| 48 | |
| 49 | static int gpio_charger_get_property(struct power_supply *psy, |
| 50 | enum power_supply_property psp, union power_supply_propval *val) |
| 51 | { |
| 52 | struct gpio_charger *gpio_charger = psy_to_gpio_charger(psy); |
| 53 | const struct gpio_charger_platform_data *pdata = gpio_charger->pdata; |
| 54 | |
| 55 | switch (psp) { |
| 56 | case POWER_SUPPLY_PROP_ONLINE: |
| 57 | val->intval = gpio_get_value_cansleep(pdata->gpio); |
| 58 | val->intval ^= pdata->gpio_active_low; |
| 59 | break; |
| 60 | default: |
| 61 | return -EINVAL; |
| 62 | } |
| 63 | |
| 64 | return 0; |
| 65 | } |
| 66 | |
| 67 | static enum power_supply_property gpio_charger_properties[] = { |
| 68 | POWER_SUPPLY_PROP_ONLINE, |
| 69 | }; |
| 70 | |
| 71 | static int __devinit gpio_charger_probe(struct platform_device *pdev) |
| 72 | { |
| 73 | const struct gpio_charger_platform_data *pdata = pdev->dev.platform_data; |
| 74 | struct gpio_charger *gpio_charger; |
| 75 | struct power_supply *charger; |
| 76 | int ret; |
| 77 | int irq; |
| 78 | |
| 79 | if (!pdata) { |
| 80 | dev_err(&pdev->dev, "No platform data\n"); |
| 81 | return -EINVAL; |
| 82 | } |
| 83 | |
| 84 | if (!gpio_is_valid(pdata->gpio)) { |
| 85 | dev_err(&pdev->dev, "Invalid gpio pin\n"); |
| 86 | return -EINVAL; |
| 87 | } |
| 88 | |
| 89 | gpio_charger = kzalloc(sizeof(*gpio_charger), GFP_KERNEL); |
| 90 | if (!gpio_charger) { |
| 91 | dev_err(&pdev->dev, "Failed to alloc driver structure\n"); |
| 92 | return -ENOMEM; |
| 93 | } |
| 94 | |
| 95 | charger = &gpio_charger->charger; |
| 96 | |
| 97 | charger->name = pdata->name ? pdata->name : "gpio-charger"; |
| 98 | charger->type = pdata->type; |
| 99 | charger->properties = gpio_charger_properties; |
| 100 | charger->num_properties = ARRAY_SIZE(gpio_charger_properties); |
| 101 | charger->get_property = gpio_charger_get_property; |
| 102 | charger->supplied_to = pdata->supplied_to; |
| 103 | charger->num_supplicants = pdata->num_supplicants; |
| 104 | |
| 105 | ret = gpio_request(pdata->gpio, dev_name(&pdev->dev)); |
| 106 | if (ret) { |
| 107 | dev_err(&pdev->dev, "Failed to request gpio pin: %d\n", ret); |
| 108 | goto err_free; |
| 109 | } |
| 110 | ret = gpio_direction_input(pdata->gpio); |
| 111 | if (ret) { |
| 112 | dev_err(&pdev->dev, "Failed to set gpio to input: %d\n", ret); |
| 113 | goto err_gpio_free; |
| 114 | } |
| 115 | |
| 116 | gpio_charger->pdata = pdata; |
| 117 | |
| 118 | ret = power_supply_register(&pdev->dev, charger); |
| 119 | if (ret < 0) { |
| 120 | dev_err(&pdev->dev, "Failed to register power supply: %d\n", |
| 121 | ret); |
| 122 | goto err_gpio_free; |
| 123 | } |
| 124 | |
| 125 | irq = gpio_to_irq(pdata->gpio); |
| 126 | if (irq > 0) { |
| 127 | ret = request_any_context_irq(irq, gpio_charger_irq, |
| 128 | IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING, |
| 129 | dev_name(&pdev->dev), charger); |
| 130 | if (ret < 0) |
| 131 | dev_warn(&pdev->dev, "Failed to request irq: %d\n", ret); |
| 132 | else |
| 133 | gpio_charger->irq = irq; |
| 134 | } |
| 135 | |
| 136 | platform_set_drvdata(pdev, gpio_charger); |
| 137 | |
| 138 | return 0; |
| 139 | |
| 140 | err_gpio_free: |
| 141 | gpio_free(pdata->gpio); |
| 142 | err_free: |
| 143 | kfree(gpio_charger); |
| 144 | return ret; |
| 145 | } |
| 146 | |
| 147 | static int __devexit gpio_charger_remove(struct platform_device *pdev) |
| 148 | { |
| 149 | struct gpio_charger *gpio_charger = platform_get_drvdata(pdev); |
| 150 | |
| 151 | if (gpio_charger->irq) |
| 152 | free_irq(gpio_charger->irq, &gpio_charger->charger); |
| 153 | |
| 154 | power_supply_unregister(&gpio_charger->charger); |
| 155 | |
| 156 | gpio_free(gpio_charger->pdata->gpio); |
| 157 | |
| 158 | platform_set_drvdata(pdev, NULL); |
| 159 | kfree(gpio_charger); |
| 160 | |
| 161 | return 0; |
| 162 | } |
| 163 | |
| 164 | #ifdef CONFIG_PM_SLEEP |
| 165 | static int gpio_charger_resume(struct device *dev) |
| 166 | { |
| 167 | struct platform_device *pdev = to_platform_device(dev); |
| 168 | struct gpio_charger *gpio_charger = platform_get_drvdata(pdev); |
| 169 | |
| 170 | power_supply_changed(&gpio_charger->charger); |
| 171 | |
| 172 | return 0; |
| 173 | } |
| 174 | #endif |
| 175 | |
| 176 | static SIMPLE_DEV_PM_OPS(gpio_charger_pm_ops, NULL, gpio_charger_resume); |
| 177 | |
| 178 | static struct platform_driver gpio_charger_driver = { |
| 179 | .probe = gpio_charger_probe, |
| 180 | .remove = __devexit_p(gpio_charger_remove), |
| 181 | .driver = { |
| 182 | .name = "gpio-charger", |
| 183 | .owner = THIS_MODULE, |
| 184 | .pm = &gpio_charger_pm_ops, |
| 185 | }, |
| 186 | }; |
| 187 | |
| 188 | module_platform_driver(gpio_charger_driver); |
| 189 | |
| 190 | MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>"); |
| 191 | MODULE_DESCRIPTION("Driver for chargers which report their online status through a GPIO"); |
| 192 | MODULE_LICENSE("GPL"); |
| 193 | MODULE_ALIAS("platform:gpio-charger"); |
| 194 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9
