--- /dev/null
+/**
+ * drivers/i2c/chips/twl4030-pwrbutton.c
+ *
+ * Driver for sending triton2 power button event to input-layer
+ *
+ * Copyright (C) 2008 Nokia Corporation
+ *
+ * Written by Peter De Schrijver <peter.de-schrijver@nokia.com>
+ *
+ * This file is subject to the terms and conditions of the GNU General
+ * Public License. See the file "COPYING" in the main directory of this
+ * archive for more details.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/input.h>
+#include <linux/timer.h>
+#include <linux/jiffies.h>
+#include <linux/kthread.h>
+#include <linux/interrupt.h>
+#include <linux/i2c/twl4030.h>
+
+#define PWR_ISR1 0
+#define PWR_IMR1 1
+#define PWR_PWRON_IRQ (1<<0)
+
+#define PWR_EDR1 5
+#define PWR_PWRON_RISING (1<<1)
+#define PWR_PWRON_FALLING (1<<0)
+#define PWR_PWRON_BOTH (PWR_PWRON_RISING | PWR_PWRON_FALLING)
+
+#define PWR_SIH_CTRL 7
+
+#define STS_HW_CONDITIONS 0xf
+
+static struct input_dev *powerbutton_dev;
+
+/*
+ * Note : the following function runs in kernel thread context
+ * with IRQs enabled
+ */
+
+static irqreturn_t powerbutton_irq(int irq, void *dev_id)
+{
+ int err;
+ u8 value;
+
+ err = twl4030_i2c_read_u8(TWL4030_MODULE_PM_MASTER, &value,
+ STS_HW_CONDITIONS);
+ if (!err) {
+ input_report_key(powerbutton_dev, KEY_POWER,
+ value & PWR_PWRON_IRQ);
+ } else {
+ printk(KERN_WARNING "I2C error %d while reading TWL4030"
+ "PM_MASTER STS_HW_CONDITIONS register\n", err);
+ }
+
+ return IRQ_HANDLED;
+}
+
+static int __init twl4030_pwrbutton_init(void)
+{
+ int err = 0;
+ u8 value;
+
+ if (request_irq(TWL4030_PWRIRQ_PWRBTN, powerbutton_irq, 0,
+ "PwrButton", NULL) < 0) {
+ printk(KERN_ERR "Unable to allocate IRQ for power button\n");
+ err = -EBUSY;
+ goto out;
+ }
+
+ powerbutton_dev = input_allocate_device();
+ if (!powerbutton_dev) {
+ printk(KERN_ERR
+ "Unable to allocate input device for power button\n");
+ err = -ENOMEM;
+ goto free_irq_and_out;
+ }
+
+ powerbutton_dev->evbit[0] = BIT_MASK(EV_KEY);
+ powerbutton_dev->keybit[BIT_WORD(KEY_POWER)] = BIT_MASK(KEY_POWER);
+ powerbutton_dev->name = "triton2-pwrbutton";
+
+ err = input_register_device(powerbutton_dev);
+ if (err)
+ goto free_input_dev;
+
+ err = twl4030_i2c_read_u8(TWL4030_MODULE_INT, &value, PWR_IMR1);
+ if (err) {
+ printk(KERN_WARNING "I2C error %d while reading TWL4030"
+ "INT PWR_IMR1 register\n", err);
+
+ goto free_input_dev;
+ }
+
+ err = twl4030_i2c_write_u8(TWL4030_MODULE_INT,
+ value & (~PWR_PWRON_IRQ), PWR_IMR1);
+ if (err) {
+ printk(KERN_WARNING "I2C error %d while writing TWL4030"
+ "INT PWR_IMR1 register\n", err);
+ goto free_input_dev;
+ }
+
+ err = twl4030_i2c_read_u8(TWL4030_MODULE_INT, &value, PWR_EDR1);
+ if (err) {
+ printk(KERN_WARNING "I2C error %d while reading TWL4030"
+ "INT PWR_EDR1 register\n", err);
+ goto free_input_dev;
+ }
+
+ err = twl4030_i2c_write_u8(TWL4030_MODULE_INT,
+ value | PWR_PWRON_BOTH , PWR_EDR1);
+
+ if (err) {
+ printk(KERN_WARNING "I2C error %d while writing TWL4030"
+ "INT PWR_EDR1 register\n", err);
+ goto free_input_dev;
+ }
+
+ printk(KERN_INFO "triton2 power button driver initialized\n");
+
+ return 0;
+
+
+free_input_dev:
+ input_free_device(powerbutton_dev);
+free_irq_and_out:
+ free_irq(TWL4030_PWRIRQ_PWRBTN, NULL);
+out:
+ return err;
+}
+
+static void __exit twl4030_pwrbutton_exit(void)
+{
+ free_irq(TWL4030_PWRIRQ_PWRBTN, NULL);
+ input_unregister_device(powerbutton_dev);
+ input_free_device(powerbutton_dev);
+
+}
+
+module_init(twl4030_pwrbutton_init);
+module_exit(twl4030_pwrbutton_exit);
+
+MODULE_DESCRIPTION("Triton2 Power Button");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Peter De Schrijver");
+
--- /dev/null
+/*
+ * twl4030-pwrirq.c - handle power interrupts from TWL3040
+ *
+ * Copyright (C) 2008 Nokia Corporation
+ *
+ * Written by Peter De Schrijver <peter.de-schrijver@nokia.com>
+ *
+ * This file is subject to the terms and conditions of the GNU General
+ * Public License. See the file "COPYING" in the main directory of this
+ * archive for more details.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <linux/kernel_stat.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/i2c.h>
+#include <linux/random.h>
+#include <linux/kthread.h>
+#include <linux/i2c/twl4030.h>
+
+#define PWR_ISR1 0
+#define PWR_IMR1 1
+#define PWR_SIH_CTRL 7
+#define PWR_SIH_CTRL_COR (1<<2)
+
+static u8 twl4030_pwrirq_mask;
+static u8 twl4030_pwrirq_pending_unmask;
+
+static struct task_struct *twl4030_pwrirq_unmask_thread;
+
+static void twl4030_pwrirq_ack(unsigned int irq) {}
+
+static void twl4030_pwrirq_disableint(unsigned int irq) {}
+
+static void twl4030_pwrirq_enableint(unsigned int irq)
+{
+ twl4030_pwrirq_pending_unmask |= 1 << (irq - IH_TWL4030_PWRBASE);
+ if (twl4030_pwrirq_unmask_thread &&
+ twl4030_pwrirq_unmask_thread->state != TASK_RUNNING)
+ wake_up_process(twl4030_pwrirq_unmask_thread);
+}
+
+static struct irq_chip twl4030_pwrirq_chip = {
+ .name = "twl4030-pwr",
+ .ack = twl4030_pwrirq_ack,
+ .mask = twl4030_pwrirq_disableint,
+ .unmask = twl4030_pwrirq_enableint,
+};
+
+static void do_twl4030_pwrmodule_irq(unsigned int irq, irq_desc_t *desc)
+{
+ struct irqaction *action;
+ const unsigned int cpu = smp_processor_id();
+
+ desc->status |= IRQ_LEVEL;
+
+ if (!desc->depth) {
+ kstat_cpu(cpu).irqs[irq]++;
+
+ action = desc->action;
+ if (action) {
+ int ret;
+ int status = 0;
+ int retval = 0;
+
+ do {
+ ret = action->handler(irq, action->dev_id);
+ if (ret == IRQ_HANDLED)
+ status |= action->flags;
+ retval |= ret;
+ action = action->next;
+ } while (action);
+
+ if (status & IRQF_SAMPLE_RANDOM)
+ add_interrupt_randomness(irq);
+
+ if (retval != IRQ_HANDLED)
+ printk(KERN_ERR "ISR for TWL4030 power module"
+ " irq %d can't handle interrupt\n",
+ irq);
+ } else {
+ local_irq_disable();
+ twl4030_pwrirq_mask |= 1 << (irq - IH_TWL4030_PWRBASE);
+ local_irq_enable();
+ twl4030_i2c_write_u8(TWL4030_MODULE_INT,
+ twl4030_pwrirq_mask, PWR_IMR1);
+ }
+ }
+}
+
+static void do_twl4030_pwrirq(unsigned int irq, irq_desc_t *desc)
+{
+ const unsigned int cpu = smp_processor_id();
+
+ desc->status |= IRQ_LEVEL;
+
+ desc->chip->ack(irq);
+
+ if (!desc->depth) {
+ int ret;
+ int module_irq;
+ u8 pwr_isr;
+
+ kstat_cpu(cpu).irqs[irq]++;
+
+ local_irq_enable();
+ ret = twl4030_i2c_read_u8(TWL4030_MODULE_INT, &pwr_isr,
+ PWR_ISR1);
+ if (ret) {
+ printk(KERN_WARNING
+ "I2C error %d while reading TWL4030"
+ "INT PWR_ISR1 register\n", ret);
+ return;
+ }
+
+ for (module_irq = IH_TWL4030_PWRBASE; pwr_isr != 0;
+ module_irq++, pwr_isr >>= 1) {
+ if (pwr_isr & 1) {
+ irq_desc_t *d = irq_desc + module_irq;
+ d->handle_irq(module_irq, d);
+ }
+ }
+
+ local_irq_disable();
+ desc->chip->unmask(irq);
+ }
+}
+
+static int twl4030_pwrirq_thread(void *data)
+{
+ current->flags |= PF_NOFREEZE;
+
+ while (!kthread_should_stop()) {
+ u8 local_unmask;
+
+ local_irq_disable();
+ local_unmask = twl4030_pwrirq_pending_unmask;
+ twl4030_pwrirq_pending_unmask = 0;
+ local_irq_enable();
+
+ twl4030_pwrirq_mask &= ~local_unmask;
+
+ twl4030_i2c_write_u8(TWL4030_MODULE_INT, twl4030_pwrirq_mask,
+ PWR_IMR1);
+
+ local_irq_disable();
+ if (!twl4030_pwrirq_pending_unmask)
+ set_current_state(TASK_INTERRUPTIBLE);
+ local_irq_enable();
+
+ schedule();
+ }
+ set_current_state(TASK_RUNNING);
+ return 0;
+}
+
+static int __init twl4030_pwrirq_init(void)
+{
+ int i, err;
+
+ twl4030_pwrirq_mask = 0xff;
+ twl4030_pwrirq_pending_unmask = 0;
+
+ err = twl4030_i2c_write_u8(TWL4030_MODULE_INT, twl4030_pwrirq_mask,
+ PWR_IMR1);
+ if (err)
+ return err;
+
+ /* Enable clear on read */
+
+ err = twl4030_i2c_write_u8(TWL4030_MODULE_INT, PWR_SIH_CTRL_COR,
+ PWR_SIH_CTRL);
+ if (err)
+ return err;
+
+ twl4030_pwrirq_unmask_thread = kthread_create(twl4030_pwrirq_thread,
+ NULL, "twl4030 pwrirq");
+ if (!twl4030_pwrirq_unmask_thread) {
+ printk(KERN_ERR
+ "%s: could not create twl4030 pwrirq unmask thread!\n",
+ __func__);
+ return -ENOMEM;
+ }
+
+ for (i = IH_TWL4030_PWRBASE; i < IH_TWL4030_PWRBASE_END; i++) {
+ set_irq_chip(i, &twl4030_pwrirq_chip);
+ set_irq_handler(i, do_twl4030_pwrmodule_irq);
+ set_irq_flags(i, IRQF_VALID);
+ }
+
+ set_irq_chained_handler(TWL4030_MODIRQ_PWR, do_twl4030_pwrirq);
+
+ return 0;
+}
+
+static void __exit twl4030_pwrirq_exit(void)
+{
+
+ int i;
+
+ set_irq_handler(TWL4030_MODIRQ_PWR, NULL);
+ set_irq_flags(TWL4030_MODIRQ_PWR, 0);
+
+ for (i = IH_TWL4030_PWRBASE; i < IH_TWL4030_PWRBASE_END; i++) {
+ set_irq_handler(i, NULL);
+ set_irq_flags(i, 0);
+ }
+
+ if (twl4030_pwrirq_unmask_thread) {
+ kthread_stop(twl4030_pwrirq_unmask_thread);
+ twl4030_pwrirq_unmask_thread = NULL;
+ }
+}
+
+subsys_initcall(twl4030_pwrirq_init);
+module_exit(twl4030_pwrirq_exit);
projects / linux-2.6-omap-h63xx.git / commitdiff