diff options
author | Bibek Basu <bibek.basu@stericsson.com> | 2011-05-23 11:43:41 +0530 |
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committer | Mathieu J. Poirier <mathieu.poirier@linaro.org> | 2011-11-10 11:12:15 -0700 |
commit | 7f8ab79653dbea87c658489f54b7e8f3075992e6 (patch) | |
tree | d8505af8654ab174686f940f62cf87661463b6e4 | |
parent | 052e63e72f41e7b73c91bdff7102e50f729c97b0 (diff) |
U8500 : driver for awaking modem on sim hot swap activity
This driver uses GPIO to detect SIM hot swap and uses
Modem Access Framework to wake up modem.
ST-Ericsson Linux next: 336280
ST-Ericsson ID: 329459
ST-Ericsson FOSS-OUT ID: Trivial
Change-Id: Ib4b1f67422317850f5d859ddf4c5e457f4cb616c
Signed-off-by: Bibek Basu <bibek.basu@stericsson.com>
Reviewed-on: http://gerrit.lud.stericsson.com/gerrit/23543
Reviewed-by: QATEST
Reviewed-by: Jonas ABERG <jonas.aberg@stericsson.com>
-rw-r--r-- | arch/arm/mach-ux500/include/mach/sim_detect.h | 16 | ||||
-rw-r--r-- | drivers/misc/sim_detect.c | 163 |
2 files changed, 179 insertions, 0 deletions
diff --git a/arch/arm/mach-ux500/include/mach/sim_detect.h b/arch/arm/mach-ux500/include/mach/sim_detect.h new file mode 100644 index 00000000000..8d6e81f1e8a --- /dev/null +++ b/arch/arm/mach-ux500/include/mach/sim_detect.h @@ -0,0 +1,16 @@ +/* + * Copyright ST-Ericsson 2010 SA. + * + * Author: Bibek Basu <bibek.basu@stericsson.com> + * Licensed under GPLv2. + */ + +#ifndef _AB8500_SIM_DETECT_H +#define _AB8500_SIM_DETECT_H + +struct sim_detect_platform_data { + int irq_num; +}; + +#endif + diff --git a/drivers/misc/sim_detect.c b/drivers/misc/sim_detect.c new file mode 100644 index 00000000000..24862edfca7 --- /dev/null +++ b/drivers/misc/sim_detect.c @@ -0,0 +1,163 @@ +/* + * Copyright (C) ST-Ericsson SA 2011 + * + * Author: BIBEK BASU <bibek.basu@stericsson.com> + * License terms: GNU General Public License (GPL) version 2 + */ +#include <linux/kernel.h> +#include <linux/types.h> +#include <linux/init.h> +#include <linux/module.h> +#include <linux/err.h> +#include <linux/platform_device.h> +#include <linux/slab.h> +#include <linux/irq.h> +#include <linux/interrupt.h> +#include <linux/hrtimer.h> +#include <linux/workqueue.h> +#include <linux/modem/modem_client.h> +#include <mach/sim_detect.h> + +/* time in millisec */ +#define TIMER_DELAY 10 +struct sim_detect{ + struct work_struct timer_expired; + struct device *dev; + struct modem *modem; + struct hrtimer timer; +}; + +static void inform_modem_release(struct work_struct *work) +{ + struct sim_detect *sim_detect = + container_of(work, struct sim_detect, timer_expired); + + /* call Modem Access Framework api to release modem */ + modem_release(sim_detect->modem); +} + +static enum hrtimer_restart timer_callback(struct hrtimer *timer) +{ + struct sim_detect *sim_detect = + container_of(timer, struct sim_detect, timer); + + schedule_work(&sim_detect->timer_expired); + return HRTIMER_NORESTART; +} + +static irqreturn_t sim_activity_irq(int irq, void *dev) +{ + struct sim_detect *sim_detect = dev; + + /* call Modem Access Framework api to acquire modem */ + modem_request(sim_detect->modem); + /* start the timer for 10ms */ + hrtimer_start(&sim_detect->timer, + ktime_set(0, TIMER_DELAY*NSEC_PER_MSEC), + HRTIMER_MODE_REL); + return IRQ_HANDLED; +} + +#ifdef CONFIG_PM +/** + * sim_detect_suspend() - This routine puts the Sim detect in to sustend state. + * @dev: pointer to device structure. + * + * This routine checks the current ongoing communication with Modem by + * examining the modem_get_usage and work_pending state. + * accordingly prevents suspend if modem communication + * is on-going. + */ +int sim_detect_suspend(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct sim_detect *sim_detect = platform_get_drvdata(pdev); + + dev_dbg(&pdev->dev, "%s called...\n", __func__); + /* if modem is accessed, event system suspend */ + if (modem_get_usage(sim_detect->modem) + || work_pending(&sim_detect->timer_expired)) + return -EBUSY; + else + return 0; +} + +static const struct dev_pm_ops sim_detect_dev_pm_ops = { + .suspend = sim_detect_suspend, +}; +#endif + +static int __devinit sim_detect_probe(struct platform_device *pdev) +{ + struct sim_detect_platform_data *plat = dev_get_platdata(&pdev->dev); + struct sim_detect *sim_detect; + int ret; + + sim_detect = kzalloc(sizeof(struct sim_detect), GFP_KERNEL); + if (sim_detect == NULL) { + dev_err(&pdev->dev, "failed to allocate memory\n"); + return -ENOMEM; + } + sim_detect->dev = &pdev->dev; + INIT_WORK(&sim_detect->timer_expired, inform_modem_release); + hrtimer_init(&sim_detect->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); + sim_detect->timer.function = timer_callback; + sim_detect->modem = modem_get(sim_detect->dev, "u8500-shrm-modem"); + if (IS_ERR(sim_detect->modem)) { + ret = PTR_ERR(sim_detect->modem); + dev_err(sim_detect->dev, "Could not retrieve the modem\n"); + goto out_free; + } + platform_set_drvdata(pdev, sim_detect); + ret = request_threaded_irq(plat->irq_num, + NULL, sim_activity_irq, + IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING, + "sim activity", sim_detect); + if (ret < 0) + goto out_free_irq; +out_free_irq: + modem_put(sim_detect->modem); + platform_set_drvdata(pdev, NULL); +out_free: + kfree(sim_detect); + return ret; +} + +static int __devexit sim_detect_remove(struct platform_device *pdev) +{ + struct sim_detect *sim_detect = platform_get_drvdata(pdev); + + modem_put(sim_detect->modem); + platform_set_drvdata(pdev, NULL); + kfree(sim_detect); + return 0; +} + +static struct platform_driver sim_detect_driver = { + .driver = { + .name = "sim_detect", + .owner = THIS_MODULE, +#ifdef CONFIG_PM + .pm = &sim_detect_dev_pm_ops, +#endif + }, + .probe = sim_detect_probe, + .remove = __devexit_p(sim_detect_remove), +}; + +static int __init sim_detect_init(void) +{ + return platform_driver_register(&sim_detect_driver); +} +module_init(sim_detect_init); + +static void __exit sim_detect_exit(void) +{ + platform_driver_unregister(&sim_detect_driver); +} +module_exit(sim_detect_exit); + +MODULE_AUTHOR("BIBEK BASU <bibek.basu@stericsson.com>"); +MODULE_DESCRIPTION("Detects SIM Hot Swap and wakes modem"); +MODULE_ALIAS("SIM DETECT INTERRUPT driver"); +MODULE_LICENSE("GPL v2"); |