target/linux/s3c24xx/files-2.6.30/arch/arm/mach-s3c2442/gta02-pm-bt.c

   1 /*
   2  * Bluetooth PM code for the Openmoko Freerunner GSM Phone
   3  *
   4  * (C) 2007 by Openmoko Inc.
   5  * Author: Harald Welte <laforge@openmoko.org>
   6  * All rights reserved.
   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 version 2 as
  10  * published by the Free Software Foundation
  11  *
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/init.h>
  16 #include <linux/kernel.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/rfkill.h>
  19 #include <linux/err.h>
  20
  21 #include <mach/hardware.h>
  22 #include <asm/mach-types.h>
  23
  24 #include <mach/gta02.h>
  25 #include <linux/mfd/pcf50633/gpio.h>
  26
  27 #include <linux/regulator/consumer.h>
  28
  29 #define DRVMSG "Openmoko Freerunner Bluetooth Power Management"
  30
  31 struct gta02_pm_bt_data {
  32         struct regulator *regulator;
  33         struct rfkill *rfkill;
  34         int pre_resume_state;
  35 };
  36
  37 static ssize_t bt_read(struct device *dev, struct device_attribute *attr,
  38                        char *buf)
  39 {
  40         int ret = 0;
  41         if (!strcmp(attr->attr.name, "power_on")) {
  42                 if (s3c2410_gpio_getpin(GTA02_GPIO_BT_EN))
  43                         ret = 1;
  44         } else if (!strcmp(attr->attr.name, "reset")) {
  45                 if (s3c2410_gpio_getpin(GTA02_GPIO_BT_EN) == 0)
  46                         ret = 1;
  47         }
  48
  49         if (!ret) {
  50                 return strlcpy(buf, "0\n", 3);
  51         } else {
  52                 return strlcpy(buf, "1\n", 3);
  53         }
  54 }
  55
  56 static void __gta02_pm_bt_toggle_radio(struct device *dev, unsigned int on)
  57 {
  58         struct gta02_pm_bt_data *bt_data = dev_get_drvdata(dev);
  59
  60         dev_info(dev, "__gta02_pm_bt_toggle_radio %d\n", on);
  61
  62         bt_data = dev_get_drvdata(dev);
  63
  64     s3c2410_gpio_setpin(GTA02_GPIO_BT_EN, !on);
  65
  66         if (on) {
  67                 if (!regulator_is_enabled(bt_data->regulator))
  68                         regulator_enable(bt_data->regulator);
  69         } else {
  70                 if (regulator_is_enabled(bt_data->regulator))
  71                         regulator_disable(bt_data->regulator);
  72         }
  73
  74         s3c2410_gpio_setpin(GTA02_GPIO_BT_EN, on);
  75 }
  76
  77
  78 static int bt_rfkill_toggle_radio(void *data, enum rfkill_state state)
  79 {
  80         struct device *dev = data;
  81         unsigned long on = (state == RFKILL_STATE_ON);
  82
  83         __gta02_pm_bt_toggle_radio(dev, on);
  84
  85         return 0;
  86 }
  87
  88 static ssize_t bt_write(struct device *dev, struct device_attribute *attr,
  89                         const char *buf, size_t count)
  90 {
  91         unsigned long on = simple_strtoul(buf, NULL, 10);
  92         struct gta02_pm_bt_data *bt_data = dev_get_drvdata(dev);
  93
  94         if (!strcmp(attr->attr.name, "power_on")) {
  95                 enum rfkill_state state = on ? RFKILL_STATE_ON : RFKILL_STATE_OFF;
  96                 bt_rfkill_toggle_radio(dev, state);
  97                 bt_data->rfkill->state = state;
  98
  99                 __gta02_pm_bt_toggle_radio(dev, on);
 100         } else if (!strcmp(attr->attr.name, "reset")) {
 101                 /* reset is low-active, so we need to invert */
 102                 s3c2410_gpio_setpin(GTA02_GPIO_BT_EN, on ? 0 : 1);
 103         }
 104
 105         return count;
 106 }
 107
 108 static DEVICE_ATTR(power_on, 0644, bt_read, bt_write);
 109 static DEVICE_ATTR(reset, 0644, bt_read, bt_write);
 110
 111 #ifdef CONFIG_PM
 112 static int gta02_bt_suspend(struct platform_device *pdev, pm_message_t state)
 113 {
 114         struct gta02_pm_bt_data *bt_data = dev_get_drvdata(&pdev->dev);
 115
 116         dev_dbg(&pdev->dev, DRVMSG ": suspending\n");
 117
 118         bt_data->pre_resume_state = s3c2410_gpio_getpin(GTA02_GPIO_BT_EN);
 119         __gta02_pm_bt_toggle_radio(&pdev->dev, 0);
 120
 121         return 0;
 122 }
 123
 124 static int gta02_bt_resume(struct platform_device *pdev)
 125 {
 126         struct gta02_pm_bt_data *bt_data = dev_get_drvdata(&pdev->dev);
 127         dev_dbg(&pdev->dev, DRVMSG ": resuming\n");
 128
 129         __gta02_pm_bt_toggle_radio(&pdev->dev, bt_data->pre_resume_state);
 130         return 0;
 131 }
 132 #else
 133 #define gta02_bt_suspend        NULL
 134 #define gta02_bt_resume         NULL
 135 #endif
 136
 137 static struct attribute *gta02_bt_sysfs_entries[] = {
 138         &dev_attr_power_on.attr,
 139         &dev_attr_reset.attr,
 140         NULL
 141 };
 142
 143 static struct attribute_group gta02_bt_attr_group = {
 144         .name   = NULL,
 145         .attrs  = gta02_bt_sysfs_entries,
 146 };
 147
 148 static int __init gta02_bt_probe(struct platform_device *pdev)
 149 {
 150         struct rfkill *rfkill;
 151         struct regulator *regulator;
 152         struct gta02_pm_bt_data *bt_data;
 153         int ret;
 154
 155         dev_info(&pdev->dev, DRVMSG ": starting\n");
 156
 157         bt_data = kzalloc(sizeof(*bt_data), GFP_KERNEL);
 158         dev_set_drvdata(&pdev->dev, bt_data);
 159
 160         regulator = regulator_get(&pdev->dev, "BT_3V2");
 161         if (IS_ERR(regulator))
 162                 return -ENODEV;
 163
 164         bt_data->regulator = regulator;
 165
 166         /* this tests the true physical state of the regulator... */
 167         if (regulator_is_enabled(regulator)) {
 168                 /*
 169                  * but these only operate on the logical state of the
 170                  * regulator... so we need to logicaly "adopt" it on
 171                  * to turn it off
 172                  */
 173                 regulator_enable(regulator);
 174                 regulator_disable(regulator);
 175         }
 176
 177         /* we pull reset to low to make sure that the chip doesn't
 178          * drain power through the reset line */
 179         s3c2410_gpio_setpin(GTA02_GPIO_BT_EN, 0);
 180
 181         rfkill = rfkill_allocate(&pdev->dev, RFKILL_TYPE_BLUETOOTH);
 182
 183         rfkill->name = pdev->name;
 184         rfkill->data = &pdev->dev;
 185         rfkill->state = RFKILL_STATE_OFF;
 186         rfkill->toggle_radio = bt_rfkill_toggle_radio;
 187
 188         ret = rfkill_register(rfkill);
 189         if (ret) {
 190                 dev_err(&pdev->dev, "Failed to register rfkill\n");
 191                 return ret;
 192         }
 193
 194         bt_data->rfkill = rfkill;
 195
 196         return sysfs_create_group(&pdev->dev.kobj, &gta02_bt_attr_group);
 197 }
 198
 199 static int gta02_bt_remove(struct platform_device *pdev)
 200 {
 201         struct gta02_pm_bt_data *bt_data = dev_get_drvdata(&pdev->dev);
 202         struct regulator *regulator;
 203
 204         sysfs_remove_group(&pdev->dev.kobj, &gta02_bt_attr_group);
 205
 206         if (bt_data->rfkill) {
 207                 rfkill_unregister(bt_data->rfkill);
 208                 rfkill_free(bt_data->rfkill);
 209         }
 210
 211         if (!bt_data || !bt_data->regulator)
 212                 return 0;
 213
 214         regulator = bt_data->regulator;
 215
 216         /* Make sure regulator is disabled before calling regulator_put */
 217         if (regulator_is_enabled(regulator))
 218                 regulator_disable(regulator);
 219
 220         regulator_put(regulator);
 221
 222         kfree(bt_data);
 223
 224         return 0;
 225 }
 226
 227 static struct platform_driver gta02_bt_driver = {
 228         .probe          = gta02_bt_probe,
 229         .remove         = gta02_bt_remove,
 230         .suspend        = gta02_bt_suspend,
 231         .resume         = gta02_bt_resume,
 232         .driver         = {
 233                 .name           = "gta02-pm-bt",
 234         },
 235 };
 236
 237 static int __devinit gta02_bt_init(void)
 238 {
 239         return platform_driver_register(&gta02_bt_driver);
 240 }
 241
 242 static void gta02_bt_exit(void)
 243 {
 244         platform_driver_unregister(&gta02_bt_driver);
 245 }
 246
 247 module_init(gta02_bt_init);
 248 module_exit(gta02_bt_exit);
 249
 250 MODULE_LICENSE("GPL");
 251 MODULE_AUTHOR("Harald Welte <laforge@openmoko.org>");
 252 MODULE_DESCRIPTION(DRVMSG);