diff options
author | Bibek Basu <bibek.basu@stericsson.com> | 2011-05-23 11:43:41 +0530 |
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committer | said m bagheri <ebgheri@steludxu2848.(none)> | 2011-06-29 10:30:30 +0200 |
commit | 0af2d97c3df60e9fd83ff1e394517a49bbb8399f (patch) | |
tree | e5fc438f7202e3859fa11dfd57d03097e71254a1 | |
parent | b56ccf8470273e5a069cc5e76d32f24efd5963d0 (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/board-mop500.c | 19 | ||||
-rw-r--r-- | arch/arm/mach-ux500/include/mach/sim_detect.h | 16 | ||||
-rw-r--r-- | drivers/misc/Kconfig | 9 | ||||
-rw-r--r-- | drivers/misc/Makefile | 1 | ||||
-rw-r--r-- | drivers/misc/sim_detect.c | 163 |
5 files changed, 208 insertions, 0 deletions
diff --git a/arch/arm/mach-ux500/board-mop500.c b/arch/arm/mach-ux500/board-mop500.c index 8fea2580eef..d1467ea64c0 100644 --- a/arch/arm/mach-ux500/board-mop500.c +++ b/arch/arm/mach-ux500/board-mop500.c @@ -49,6 +49,9 @@ #include <mach/irqs.h> #include <mach/ste_audio.h> #include <mach/ste-dma40-db8500.h> +#ifdef CONFIG_U8500_SIM_DETECT +#include <mach/sim_detect.h> +#endif #include <video/av8100.h> #include <plat/pincfg.h> @@ -649,8 +652,24 @@ static struct hsi_board_info __initdata u8500_hsi_devices[] = { }; #endif +#ifdef CONFIG_U8500_SIM_DETECT +static struct sim_detect_platform_data sim_detect_pdata = { + .irq_num = NOMADIK_GPIO_TO_IRQ(MOP500_AB8500_GPIO(12)), +}; +struct platform_device u8500_sim_detect_device = { + .name = "sim_detect", + .id = 0, + .dev = { + .platform_data = &sim_detect_pdata, + }, +}; +#endif + /* add any platform devices here - TODO */ static struct platform_device *mop500_platform_devs[] __initdata = { +#ifdef CONFIG_U8500_SIM_DETECT + &u8500_sim_detect_device, +#endif &u8500_shrm_device, #ifdef CONFIG_U8500_MMIO &ux500_mmio_device, 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/Kconfig b/drivers/misc/Kconfig index b98e359c447..c483882d81c 100644 --- a/drivers/misc/Kconfig +++ b/drivers/misc/Kconfig @@ -481,6 +481,15 @@ config U5500_MBOX help Add support for U5500 mailbox communication with modem side +config U8500_SIM_DETECT + bool "Sim hot swap detection support" + depends on (MODEM && UX500_SOC_DB8500) + default y + help + Add support for sim hot swap detection support in U8500.Driver + basically wakes up the modem if its sleeping when sim hot plug + in/out has happened. + source "drivers/misc/Kconfig.stm" source "drivers/misc/c2port/Kconfig" source "drivers/misc/eeprom/Kconfig" diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile index 24c30580fb5..7e73073429f 100644 --- a/drivers/misc/Makefile +++ b/drivers/misc/Makefile @@ -49,3 +49,4 @@ obj-$(CONFIG_STM_I2S) += i2s/ obj-$(CONFIG_STE_AUDIO_IO_DEV) += audio_io_dev/ obj-$(CONFIG_HWMEM) += hwmem/ obj-$(CONFIG_U5500_MBOX) += mbox.o mbox_channels-db5500.o +obj-$(CONFIG_U8500_SIM_DETECT) += sim_detect.o 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"); |