2 * twl4030-pwrirq.c - handle power interrupts from TWL3040
4 * Copyright (C) 2008 Nokia Corporation
6 * Written by Peter De Schrijver <peter.de-schrijver@nokia.com>
8 * This file is subject to the terms and conditions of the GNU General
9 * Public License. See the file "COPYING" in the main directory of this
10 * archive for more details.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 #include <linux/kernel_stat.h>
23 #include <linux/module.h>
24 #include <linux/interrupt.h>
25 #include <linux/irq.h>
26 #include <linux/i2c.h>
27 #include <linux/random.h>
28 #include <linux/kthread.h>
29 #include <linux/i2c/twl4030.h>
32 static DEFINE_SPINLOCK(pwr_lock);
33 static u8 twl4030_pwrirq_mask;
35 static struct task_struct *twl4030_pwrirq_unmask_thread;
37 static void twl4030_pwrirq_ack(unsigned int irq) {}
39 static void twl4030_pwrirq_disableint(unsigned int irq)
43 spin_lock_irqsave(&pwr_lock, flags);
44 twl4030_pwrirq_mask |= 1 << (irq - TWL4030_PWR_IRQ_BASE);
45 if (twl4030_pwrirq_unmask_thread
46 && twl4030_pwrirq_unmask_thread->state != TASK_RUNNING)
47 wake_up_process(twl4030_pwrirq_unmask_thread);
48 spin_unlock_irqrestore(&pwr_lock, flags);
51 static void twl4030_pwrirq_enableint(unsigned int irq)
55 spin_lock_irqsave(&pwr_lock, flags);
56 twl4030_pwrirq_mask &= ~(1 << (irq - TWL4030_PWR_IRQ_BASE));
57 if (twl4030_pwrirq_unmask_thread
58 && twl4030_pwrirq_unmask_thread->state != TASK_RUNNING)
59 wake_up_process(twl4030_pwrirq_unmask_thread);
60 spin_unlock_irqrestore(&pwr_lock, flags);
63 static struct irq_chip twl4030_pwrirq_chip = {
64 .name = "twl4030-pwr",
65 .ack = twl4030_pwrirq_ack,
66 .mask = twl4030_pwrirq_disableint,
67 .unmask = twl4030_pwrirq_enableint,
70 static void do_twl4030_pwrirq(unsigned int irq, irq_desc_t *desc)
72 const unsigned int cpu = smp_processor_id();
74 desc->status |= IRQ_LEVEL;
83 kstat_cpu(cpu).irqs[irq]++;
86 ret = twl4030_i2c_read_u8(TWL4030_MODULE_INT, &pwr_isr,
87 TWL4030_INT_PWR_ISR1);
91 "I2C error %d while reading TWL4030"
92 "INT PWR_ISR1 register\n", ret);
96 for (module_irq = TWL4030_PWR_IRQ_BASE; pwr_isr != 0;
97 module_irq++, pwr_isr >>= 1) {
99 generic_handle_irq(module_irq);
102 desc->chip->unmask(irq);
106 static int twl4030_pwrirq_thread(void *data)
108 current->flags |= PF_NOFREEZE;
110 while (!kthread_should_stop()) {
113 spin_lock_irq(&pwr_lock);
114 local_mask = twl4030_pwrirq_mask;
115 spin_unlock_irq(&pwr_lock);
117 twl4030_i2c_write_u8(TWL4030_MODULE_INT, local_mask,
118 TWL4030_INT_PWR_IMR1);
120 spin_lock_irq(&pwr_lock);
121 if (local_mask == twl4030_pwrirq_mask)
122 set_current_state(TASK_INTERRUPTIBLE);
123 spin_unlock_irq(&pwr_lock);
127 set_current_state(TASK_RUNNING);
131 static int __init twl4030_pwrirq_init(void)
135 twl4030_pwrirq_mask = 0xff;
137 err = twl4030_i2c_write_u8(TWL4030_MODULE_INT, twl4030_pwrirq_mask,
138 TWL4030_INT_PWR_IMR1);
142 /* Enable clear on read */
144 err = twl4030_i2c_write_u8(TWL4030_MODULE_INT,
145 TWL4030_SIH_CTRL_COR_MASK,
146 TWL4030_INT_PWR_SIH_CTRL);
150 twl4030_pwrirq_unmask_thread = kthread_create(twl4030_pwrirq_thread,
151 NULL, "twl4030 pwrirq");
152 if (!twl4030_pwrirq_unmask_thread) {
154 "%s: could not create twl4030 pwrirq unmask thread!\n",
159 for (i = TWL4030_PWR_IRQ_BASE; i < TWL4030_PWR_IRQ_END; i++) {
160 set_irq_chip_and_handler(i, &twl4030_pwrirq_chip,
162 set_irq_flags(i, IRQF_VALID);
165 set_irq_chained_handler(TWL4030_MODIRQ_PWR, do_twl4030_pwrirq);
169 subsys_initcall(twl4030_pwrirq_init);
171 static void __exit twl4030_pwrirq_exit(void)
176 /* FIXME the irqs are left enabled; trouble when they arrive... */
178 set_irq_handler(TWL4030_MODIRQ_PWR, NULL);
179 set_irq_flags(TWL4030_MODIRQ_PWR, 0);
181 for (i = TWL4030_PWR_IRQ_BASE; i < TWL4030_PWR_IRQ_END; i++) {
182 set_irq_handler(i, NULL);
186 if (twl4030_pwrirq_unmask_thread) {
187 kthread_stop(twl4030_pwrirq_unmask_thread);
188 twl4030_pwrirq_unmask_thread = NULL;
191 module_exit(twl4030_pwrirq_exit);