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/*
* GSM Management code for the FIC Neo1973 GSM Phone
*
* (C) 2007 by OpenMoko Inc.
* Author: Harald Welte <laforge@openmoko.org>
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation
*
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/console.h>
#include <linux/errno.h>
#include <asm/hardware.h>
#include <asm/arch/gta01.h>
struct gta01pm_priv {
int gpio_ngsm_en;
struct console *con;
};
static struct gta01pm_priv gta01_gsm;
static struct console *find_s3c24xx_console(void)
{
struct console *con;
acquire_console_sem();
for (con = console_drivers; con; con = con->next) {
if (!strcmp(con->name, "ttySAC"))
break;
}
release_console_sem();
return con;
}
static ssize_t gsm_read(struct device *dev, struct device_attribute *attr,
char *buf)
{
if (!strcmp(attr->attr.name, "power_on")) {
if (s3c2410_gpio_getpin(GTA01_GPIO_MODEM_ON))
goto out_1;
} else if (!strcmp(attr->attr.name, "reset")) {
if (s3c2410_gpio_getpin(GTA01_GPIO_MODEM_RST))
goto out_1;
} else if (!strcmp(attr->attr.name, "download")) {
if (s3c2410_gpio_getpin(GTA01_GPIO_MODEM_DNLOAD))
goto out_1;
}
return strlcpy(buf, "0\n", 3);
out_1:
return strlcpy(buf, "1\n", 3);
}
static ssize_t gsm_write(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
unsigned long on = simple_strtoul(buf, NULL, 10);
if (!strcmp(attr->attr.name, "power_on")) {
if (on) {
dev_info(dev, "powering up GSM, thus disconnecting "
"serial console\n");
if (gta01_gsm.con)
console_stop(gta01_gsm.con);
if (gta01_gsm.gpio_ngsm_en)
s3c2410_gpio_setpin(gta01_gsm.gpio_ngsm_en, 0);
s3c2410_gpio_setpin(GTA01_GPIO_MODEM_ON, 1);
} else {
s3c2410_gpio_setpin(GTA01_GPIO_MODEM_ON, 0);
if (gta01_gsm.gpio_ngsm_en)
s3c2410_gpio_setpin(gta01_gsm.gpio_ngsm_en, 1);
if (gta01_gsm.con)
console_start(gta01_gsm.con);
dev_info(dev, "powered down GSM, thus enabling "
"serial console\n");
}
} else if (!strcmp(attr->attr.name, "reset")) {
s3c2410_gpio_setpin(GTA01_GPIO_MODEM_RST, on);
} else if (!strcmp(attr->attr.name, "download")) {
s3c2410_gpio_setpin(GTA01_GPIO_MODEM_DNLOAD, on);
}
return count;
}
static DEVICE_ATTR(power_on, 0644, gsm_read, gsm_write);
static DEVICE_ATTR(reset, 0644, gsm_read, gsm_write);
static DEVICE_ATTR(download, 0644, gsm_read, gsm_write);
#ifdef CONFIG_PM
static int gta01_gsm_suspend(struct platform_device *pdev, pm_message_t state)
{
/* GPIO state is saved/restored by S3C2410 core GPIO driver, so we
* don't need to do anything here */
return 0;
}
static int gta01_gsm_resume(struct platform_device *pdev)
{
/* GPIO state is saved/restored by S3C2410 core GPIO driver, so we
* don't need to do anything here */
/* Make sure that the kernel console on the serial port is still
* disabled. FIXME: resume ordering race with serial driver! */
if (s3c2410_gpio_getpin(GTA01_GPIO_MODEM_ON) && gta01_gsm.con)
console_stop(gta01_gsm.con);
return 0;
}
#else
#define gta01_gsm_suspend NULL
#define gta01_gsm_resume NULL
#endif
static struct attribute *gta01_gsm_sysfs_entries[] = {
&dev_attr_power_on.attr,
&dev_attr_reset.attr,
NULL,
NULL
};
static struct attribute_group gta01_gsm_attr_group = {
.name = NULL,
.attrs = gta01_gsm_sysfs_entries,
};
static int __init gta01_gsm_probe(struct platform_device *pdev)
{
switch (system_rev) {
case GTA01v3_SYSTEM_REV:
gta01_gsm.gpio_ngsm_en = GTA01v3_GPIO_nGSM_EN;
break;
case GTA01v4_SYSTEM_REV:
gta01_gsm.gpio_ngsm_en = 0;
break;
case GTA01Bv2_SYSTEM_REV:
case GTA01Bv3_SYSTEM_REV:
case GTA01Bv4_SYSTEM_REV:
gta01_gsm.gpio_ngsm_en = GTA01Bv2_GPIO_nGSM_EN;
s3c2410_gpio_setpin(GTA01v3_GPIO_nGSM_EN, 0);
break;
default:
dev_warn(&pdev->dev, "Unknown GTA01 Revision 0x%x, "
"some PM features not available!!!\n",
system_rev);
break;
}
switch (system_rev) {
case GTA01v4_SYSTEM_REV:
case GTA01Bv2_SYSTEM_REV:
gta01_gsm_sysfs_entries[ARRAY_SIZE(gta01_gsm_sysfs_entries)-2] =
&dev_attr_download.attr;
break;
default:
break;
}
gta01_gsm.con = find_s3c24xx_console();
if (!gta01_gsm.con)
dev_warn(&pdev->dev, "cannot find S3C24xx console driver\n");
return sysfs_create_group(&pdev->dev.kobj, >a01_gsm_attr_group);
}
static int gta01_gsm_remove(struct platform_device *pdev)
{
sysfs_remove_group(&pdev->dev.kobj, >a01_gsm_attr_group);
return 0;
}
static struct platform_driver gta01_gsm_driver = {
.probe = gta01_gsm_probe,
.remove = gta01_gsm_remove,
.suspend = gta01_gsm_suspend,
.resume = gta01_gsm_resume,
.driver = {
.name = "neo1973-pm-gsm",
},
};
static int __devinit gta01_gsm_init(void)
{
return platform_driver_register(>a01_gsm_driver);
}
static void gta01_gsm_exit(void)
{
platform_driver_unregister(>a01_gsm_driver);
}
module_init(gta01_gsm_init);
module_exit(gta01_gsm_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Harald Welte <laforge@openmoko.org>");
MODULE_DESCRIPTION("FIC Neo1973 GSM Power Management");
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