| /* |
| * tps65912-irq.c -- TI TPS6591x |
| * |
| * Copyright 2011 Texas Instruments Inc. |
| * |
| * Author: Margarita Olaya <magi@slimlogic.co.uk> |
| * |
| * This program is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License as published by the |
| * Free Software Foundation; either version 2 of the License, or (at your |
| * option) any later version. |
| * |
| * This driver is based on wm8350 implementation. |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/init.h> |
| #include <linux/bug.h> |
| #include <linux/device.h> |
| #include <linux/interrupt.h> |
| #include <linux/irq.h> |
| #include <linux/gpio.h> |
| #include <linux/mfd/tps65912.h> |
| #include <linux/input.h> |
| |
| static inline int irq_to_tps65912_irq(struct tps65912 *tps65912, |
| int irq) |
| { |
| return irq - tps65912->irq_base; |
| } |
| |
| /* this powerkey_handler runs in process contextt, not in interrupt context*/ |
| static irqreturn_t powerkey_handler(int irq, void *irq_data) |
| { |
| struct tps65912 *tps65912 = irq_data; |
| u32 new_state; |
| |
| if (irq - tps65912->irq_base == tps65912->powerkey_up_irq) { |
| new_state = PWRKEY_RELEASE; |
| } else if (irq - tps65912->irq_base == tps65912->powerkey_down_irq) { |
| new_state = PWRKEY_PRESS; |
| } else { |
| pr_info("incorrect interrupt %d for power key\n", |
| irq - tps65912->irq_base); |
| return IRQ_HANDLED; |
| } |
| |
| mutex_lock(&tps65912->irq_lock); |
| if (new_state != tps65912->powerkey_state) { |
| tps65912_broadcast_key_event(tps65912, |
| tps65912->powerkey_code, |
| new_state); |
| tps65912->powerkey_state = new_state; |
| } |
| mutex_unlock(&tps65912->irq_lock); |
| pr_debug("tps65912 handle irq %d state = %s\n", irq, |
| new_state == PWRKEY_RELEASE ? "RELEASE" : "PRESS" ); |
| return IRQ_HANDLED; |
| } |
| /* |
| * This is a threaded IRQ handler so can access I2C/SPI. Since the |
| * IRQ handler explicitly clears the IRQ it handles the IRQ line |
| * will be reasserted and the physical IRQ will be handled again if |
| * another interrupt is asserted while we run - in the normal course |
| * of events this is a rare occurrence so we save I2C/SPI reads. We're |
| * also assuming that it's rare to get lots of interrupts firing |
| * simultaneously so try to minimise I/O. |
| */ |
| static irqreturn_t tps65912_irq(int irq, void *irq_data) |
| { |
| struct tps65912 *tps65912 = irq_data; |
| u32 irq_sts; |
| u8 reg; |
| int i; |
| |
| pr_debug("tps65912 handle irq %d\n", irq); |
| mutex_lock(&tps65912->pm_lock); |
| |
| tps65912->read(tps65912, TPS65912_INT_STS, 1, ®); |
| irq_sts = reg; |
| tps65912->read(tps65912, TPS65912_INT_STS2, 1, ®); |
| irq_sts |= reg << 8; |
| tps65912->read(tps65912, TPS65912_INT_STS3, 1, ®); |
| irq_sts |= reg << 16; |
| tps65912->read(tps65912, TPS65912_INT_STS4, 1, ®); |
| irq_sts |= reg << 24; |
| |
| irq_sts &= ~tps65912->irq_mask; |
| if (!irq_sts) { |
| mutex_unlock(&tps65912->pm_lock); |
| pr_debug("tps65912 %d IRQ_NONE\n", irq); |
| return IRQ_NONE; |
| } |
| |
| for (i = tps65912->irq_num - 1; i >= 0; i--) { |
| if (!(irq_sts & (1 << i))) |
| continue; |
| |
| handle_nested_irq(tps65912->irq_base + i); |
| } |
| |
| /* Write the STS register back to clear IRQs we handled */ |
| reg = irq_sts & 0xFF; |
| irq_sts >>= 8; |
| if (reg) |
| tps65912->write(tps65912, TPS65912_INT_STS, 1, ®); |
| reg = irq_sts & 0xFF; |
| irq_sts >>= 8; |
| if (reg) |
| tps65912->write(tps65912, TPS65912_INT_STS2, 1, ®); |
| reg = irq_sts & 0xFF; |
| irq_sts >>= 8; |
| if (reg) |
| tps65912->write(tps65912, TPS65912_INT_STS3, 1, ®); |
| reg = irq_sts & 0xFF; |
| if (reg) |
| tps65912->write(tps65912, TPS65912_INT_STS4, 1, ®); |
| |
| mutex_unlock(&tps65912->pm_lock); |
| |
| pr_debug("tps65912 %d IRQ_HANDLED\n", irq); |
| return IRQ_HANDLED; |
| } |
| |
| static void tps65912_irq_lock(struct irq_data *data) |
| { |
| struct tps65912 *tps65912 = irq_data_get_irq_chip_data(data); |
| |
| mutex_lock(&tps65912->irq_lock); |
| } |
| |
| static void tps65912_irq_sync_unlock(struct irq_data *data) |
| { |
| struct tps65912 *tps65912 = irq_data_get_irq_chip_data(data); |
| u32 reg_mask; |
| u8 reg; |
| |
| tps65912->read(tps65912, TPS65912_INT_MSK, 1, ®); |
| reg_mask = reg; |
| tps65912->read(tps65912, TPS65912_INT_MSK2, 1, ®); |
| reg_mask |= reg << 8; |
| tps65912->read(tps65912, TPS65912_INT_MSK3, 1, ®); |
| reg_mask |= reg << 16; |
| tps65912->read(tps65912, TPS65912_INT_MSK4, 1, ®); |
| reg_mask |= reg << 24; |
| |
| if (tps65912->irq_mask != reg_mask) { |
| reg = tps65912->irq_mask & 0xFF; |
| tps65912->write(tps65912, TPS65912_INT_MSK, 1, ®); |
| reg = tps65912->irq_mask >> 8 & 0xFF; |
| tps65912->write(tps65912, TPS65912_INT_MSK2, 1, ®); |
| reg = tps65912->irq_mask >> 16 & 0xFF; |
| tps65912->write(tps65912, TPS65912_INT_MSK3, 1, ®); |
| reg = tps65912->irq_mask >> 24 & 0xFF; |
| tps65912->write(tps65912, TPS65912_INT_MSK4, 1, ®); |
| } |
| |
| mutex_unlock(&tps65912->irq_lock); |
| } |
| |
| static void tps65912_irq_enable(struct irq_data *data) |
| { |
| struct tps65912 *tps65912 = irq_data_get_irq_chip_data(data); |
| |
| tps65912->irq_mask &= ~(1 << irq_to_tps65912_irq(tps65912, data->irq)); |
| } |
| |
| static void tps65912_irq_disable(struct irq_data *data) |
| { |
| struct tps65912 *tps65912 = irq_data_get_irq_chip_data(data); |
| |
| tps65912->irq_mask |= (1 << irq_to_tps65912_irq(tps65912, data->irq)); |
| } |
| |
| static struct irq_chip tps65912_irq_chip = { |
| .name = "tps65912", |
| .irq_bus_lock = tps65912_irq_lock, |
| .irq_bus_sync_unlock = tps65912_irq_sync_unlock, |
| .irq_disable = tps65912_irq_disable, |
| .irq_enable = tps65912_irq_enable, |
| }; |
| |
| int tps65912_irq_init(struct tps65912 *tps65912, int irq, |
| struct tps65912_platform_data *pdata) |
| { |
| int ret, cur_irq; |
| u8 reg; |
| |
| if (!irq) { |
| dev_warn(tps65912->dev, "No interrupt support, no core IRQ\n"); |
| return 0; |
| } |
| |
| if (!pdata || !pdata->irq_base) { |
| dev_warn(tps65912->dev, "No interrupt support, no IRQ base\n"); |
| return 0; |
| } |
| |
| tps65912->powerkey_state = PWRKEY_RELEASE; |
| |
| /* Clear unattended interrupts */ |
| tps65912->read(tps65912, TPS65912_INT_STS, 1, ®); |
| tps65912->write(tps65912, TPS65912_INT_STS, 1, ®); |
| tps65912->read(tps65912, TPS65912_INT_STS2, 1, ®); |
| tps65912->write(tps65912, TPS65912_INT_STS2, 1, ®); |
| tps65912->read(tps65912, TPS65912_INT_STS3, 1, ®); |
| tps65912->write(tps65912, TPS65912_INT_STS3, 1, ®); |
| tps65912->read(tps65912, TPS65912_INT_STS4, 1, ®); |
| tps65912->write(tps65912, TPS65912_INT_STS4, 1, ®); |
| |
| /* Mask top level interrupts */ |
| tps65912->irq_mask = 0xFFFFFFFF; |
| |
| mutex_init(&tps65912->irq_lock); |
| tps65912->chip_irq = irq; |
| tps65912->irq_base = pdata->irq_base; |
| |
| tps65912->irq_num = TPS65912_NUM_IRQ; |
| |
| /* Register with genirq */ |
| for (cur_irq = tps65912->irq_base; |
| cur_irq < tps65912->irq_num + tps65912->irq_base; |
| cur_irq++) { |
| irq_set_chip_data(cur_irq, tps65912); |
| irq_set_chip_and_handler(cur_irq, &tps65912_irq_chip, |
| handle_edge_irq); |
| irq_set_nested_thread(cur_irq, 1); |
| /* ARM needs us to explicitly flag the IRQ as valid |
| * and will set them noprobe when we do so. */ |
| #ifdef CONFIG_ARM |
| set_irq_flags(cur_irq, IRQF_VALID); |
| #else |
| irq_set_noprobe(cur_irq); |
| #endif |
| } |
| |
| ret = request_threaded_irq(irq, NULL, tps65912_irq, |
| IRQF_TRIGGER_HIGH | IRQF_ONESHOT, |
| "tps65912", tps65912); |
| if (ret != 0) |
| dev_err(tps65912->dev, "Failed to request IRQ: %d\n", ret); |
| |
| ret = request_threaded_irq(tps65912->irq_base + |
| tps65912->powerkey_up_irq, NULL, powerkey_handler, |
| IRQF_TRIGGER_RISING | IRQF_ONESHOT, "tps65912_key_rel", |
| tps65912); |
| if (ret != 0) |
| dev_err(tps65912->dev, |
| "Failed to request sub-IRQ for power key rel: %d\n", ret); |
| |
| ret = request_threaded_irq(tps65912->irq_base + |
| tps65912->powerkey_down_irq, NULL, powerkey_handler, |
| IRQF_TRIGGER_RISING | IRQF_ONESHOT, "tps65912_key_press", |
| tps65912); |
| if (ret != 0) |
| dev_err(tps65912->dev, |
| "Failed to request sub-IRQ for power key press: %d\n", ret); |
| |
| return ret; |
| } |
| |
| int tps65912_irq_exit(struct tps65912 *tps65912) |
| { |
| free_irq(tps65912->chip_irq, tps65912); |
| return 0; |
| } |