diff options
Diffstat (limited to 'drivers/mxc/pmic/core/pmic_common.c')
-rw-r--r-- | drivers/mxc/pmic/core/pmic_common.c | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/drivers/mxc/pmic/core/pmic_common.c b/drivers/mxc/pmic/core/pmic_common.c new file mode 100644 index 000000000000..7e53121f12b8 --- /dev/null +++ b/drivers/mxc/pmic/core/pmic_common.c @@ -0,0 +1,131 @@ +/* + * Copyright 2009-2010 Freescale Semiconductor, Inc. All Rights Reserved. + */ + +/* + * The code contained herein is licensed under the GNU General Public + * License. You may obtain a copy of the GNU General Public License + * Version 2 or later at the following locations: + * + * http://www.opensource.org/licenses/gpl-license.html + * http://www.gnu.org/copyleft/gpl.html + */ + +/*! + * @file pmic_common.c + * @brief This is the common file for the PMIC Core/Protocol driver. + * + * @ingroup PMIC_CORE + */ + +/* + * Includes + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/slab.h> +#include <linux/platform_device.h> +#include <linux/interrupt.h> +#include <linux/irq.h> +#include <linux/kthread.h> +#include <linux/pmic_external.h> +#include <linux/pmic_status.h> + +#include <asm/uaccess.h> + +#include "pmic.h" + +/* + * Global variables + */ +pmic_version_t mxc_pmic_version; +unsigned int active_events[MAX_ACTIVE_EVENTS]; + + +static struct completion event_completion; +static struct task_struct *tstask; + +static int pmic_event_thread_func(void *v) +{ + unsigned int loop; + unsigned int count = 0; + unsigned int irq = (int)v; + + while (1) { + wait_for_completion_interruptible( + &event_completion); + if (kthread_should_stop()) + break; + + count = pmic_get_active_events( + active_events); + pr_debug("active events number %d\n", count); + + do { + for (loop = 0; loop < count; loop++) + pmic_event_callback(active_events[loop]); + + count = pmic_get_active_events(active_events); + + } while (count != 0); + enable_irq(irq); + } + + return 0; +} + +int pmic_start_event_thread(int irq_num) +{ + int ret = 0; + + if (tstask) + return ret; + + init_completion(&event_completion); + + tstask = kthread_run(pmic_event_thread_func, + (void *)irq_num, "pmic-event-thread"); + ret = IS_ERR(tstask) ? -1 : 0; + if (IS_ERR(tstask)) + tstask = NULL; + return ret; +} + +void pmic_stop_event_thread(void) +{ + if (tstask) { + complete(&event_completion); + kthread_stop(tstask); + } +} + +/*! + * This function is called when pmic interrupt occurs on the processor. + * It is the interrupt handler for the pmic module. + * + * @param irq the irq number + * @param dev_id the pointer on the device + * + * @return The function returns IRQ_HANDLED when handled. + */ +irqreturn_t pmic_irq_handler(int irq, void *dev_id) +{ + disable_irq_nosync(irq); + complete(&event_completion); + + return IRQ_HANDLED; +} + +/*! + * This function is used to determine the PMIC type and its revision. + * + * @return Returns the PMIC type and its revision. + */ + +pmic_version_t pmic_get_version(void) +{ + return mxc_pmic_version; +} +EXPORT_SYMBOL(pmic_get_version); |