diff options
Diffstat (limited to 'drivers/mfd/max8998-irq.c')
| -rw-r--r-- | drivers/mfd/max8998-irq.c | 258 |
1 files changed, 258 insertions, 0 deletions
diff --git a/drivers/mfd/max8998-irq.c b/drivers/mfd/max8998-irq.c new file mode 100644 index 000000000000..45bfe77b639b --- /dev/null +++ b/drivers/mfd/max8998-irq.c @@ -0,0 +1,258 @@ +/* + * Interrupt controller support for MAX8998 + * + * Copyright (C) 2010 Samsung Electronics Co.Ltd + * Author: Joonyoung Shim <jy0922.shim@samsung.com> + * + * 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. + * + */ + +#include <linux/device.h> +#include <linux/interrupt.h> +#include <linux/irq.h> +#include <linux/mfd/max8998-private.h> + +struct max8998_irq_data { + int reg; + int mask; +}; + +static struct max8998_irq_data max8998_irqs[] = { + [MAX8998_IRQ_DCINF] = { + .reg = 1, + .mask = MAX8998_IRQ_DCINF_MASK, + }, + [MAX8998_IRQ_DCINR] = { + .reg = 1, + .mask = MAX8998_IRQ_DCINR_MASK, + }, + [MAX8998_IRQ_JIGF] = { + .reg = 1, + .mask = MAX8998_IRQ_JIGF_MASK, + }, + [MAX8998_IRQ_JIGR] = { + .reg = 1, + .mask = MAX8998_IRQ_JIGR_MASK, + }, + [MAX8998_IRQ_PWRONF] = { + .reg = 1, + .mask = MAX8998_IRQ_PWRONF_MASK, + }, + [MAX8998_IRQ_PWRONR] = { + .reg = 1, + .mask = MAX8998_IRQ_PWRONR_MASK, + }, + [MAX8998_IRQ_WTSREVNT] = { + .reg = 2, + .mask = MAX8998_IRQ_WTSREVNT_MASK, + }, + [MAX8998_IRQ_SMPLEVNT] = { + .reg = 2, + .mask = MAX8998_IRQ_SMPLEVNT_MASK, + }, + [MAX8998_IRQ_ALARM1] = { + .reg = 2, + .mask = MAX8998_IRQ_ALARM1_MASK, + }, + [MAX8998_IRQ_ALARM0] = { + .reg = 2, + .mask = MAX8998_IRQ_ALARM0_MASK, + }, + [MAX8998_IRQ_ONKEY1S] = { + .reg = 3, + .mask = MAX8998_IRQ_ONKEY1S_MASK, + }, + [MAX8998_IRQ_TOPOFFR] = { + .reg = 3, + .mask = MAX8998_IRQ_TOPOFFR_MASK, + }, + [MAX8998_IRQ_DCINOVPR] = { + .reg = 3, + .mask = MAX8998_IRQ_DCINOVPR_MASK, + }, + [MAX8998_IRQ_CHGRSTF] = { + .reg = 3, + .mask = MAX8998_IRQ_CHGRSTF_MASK, + }, + [MAX8998_IRQ_DONER] = { + .reg = 3, + .mask = MAX8998_IRQ_DONER_MASK, + }, + [MAX8998_IRQ_CHGFAULT] = { + .reg = 3, + .mask = MAX8998_IRQ_CHGFAULT_MASK, + }, + [MAX8998_IRQ_LOBAT1] = { + .reg = 4, + .mask = MAX8998_IRQ_LOBAT1_MASK, + }, + [MAX8998_IRQ_LOBAT2] = { + .reg = 4, + .mask = MAX8998_IRQ_LOBAT2_MASK, + }, +}; + +static inline struct max8998_irq_data * +irq_to_max8998_irq(struct max8998_dev *max8998, int irq) +{ + return &max8998_irqs[irq - max8998->irq_base]; +} + +static void max8998_irq_lock(unsigned int irq) +{ + struct max8998_dev *max8998 = get_irq_chip_data(irq); + + mutex_lock(&max8998->irqlock); +} + +static void max8998_irq_sync_unlock(unsigned int irq) +{ + struct max8998_dev *max8998 = get_irq_chip_data(irq); + int i; + + for (i = 0; i < ARRAY_SIZE(max8998->irq_masks_cur); i++) { + /* + * If there's been a change in the mask write it back + * to the hardware. + */ + if (max8998->irq_masks_cur[i] != max8998->irq_masks_cache[i]) { + max8998->irq_masks_cache[i] = max8998->irq_masks_cur[i]; + max8998_write_reg(max8998->i2c, MAX8998_REG_IRQM1 + i, + max8998->irq_masks_cur[i]); + } + } + + mutex_unlock(&max8998->irqlock); +} + +static void max8998_irq_unmask(unsigned int irq) +{ + struct max8998_dev *max8998 = get_irq_chip_data(irq); + struct max8998_irq_data *irq_data = irq_to_max8998_irq(max8998, irq); + + max8998->irq_masks_cur[irq_data->reg - 1] &= ~irq_data->mask; +} + +static void max8998_irq_mask(unsigned int irq) +{ + struct max8998_dev *max8998 = get_irq_chip_data(irq); + struct max8998_irq_data *irq_data = irq_to_max8998_irq(max8998, irq); + + max8998->irq_masks_cur[irq_data->reg - 1] |= irq_data->mask; +} + +static struct irq_chip max8998_irq_chip = { + .name = "max8998", + .bus_lock = max8998_irq_lock, + .bus_sync_unlock = max8998_irq_sync_unlock, + .mask = max8998_irq_mask, + .unmask = max8998_irq_unmask, +}; + +static irqreturn_t max8998_irq_thread(int irq, void *data) +{ + struct max8998_dev *max8998 = data; + u8 irq_reg[MAX8998_NUM_IRQ_REGS]; + int ret; + int i; + + ret = max8998_bulk_read(max8998->i2c, MAX8998_REG_IRQ1, + MAX8998_NUM_IRQ_REGS, irq_reg); + if (ret < 0) { + dev_err(max8998->dev, "Failed to read interrupt register: %d\n", + ret); + return IRQ_NONE; + } + + /* Apply masking */ + for (i = 0; i < MAX8998_NUM_IRQ_REGS; i++) + irq_reg[i] &= ~max8998->irq_masks_cur[i]; + + /* Report */ + for (i = 0; i < MAX8998_IRQ_NR; i++) { + if (irq_reg[max8998_irqs[i].reg - 1] & max8998_irqs[i].mask) + handle_nested_irq(max8998->irq_base + i); + } + + return IRQ_HANDLED; +} + +int max8998_irq_init(struct max8998_dev *max8998) +{ + int i; + int cur_irq; + int ret; + + if (!max8998->irq) { + dev_warn(max8998->dev, + "No interrupt specified, no interrupts\n"); + max8998->irq_base = 0; + return 0; + } + + if (!max8998->irq_base) { + dev_err(max8998->dev, + "No interrupt base specified, no interrupts\n"); + return 0; + } + + mutex_init(&max8998->irqlock); + + /* Mask the individual interrupt sources */ + for (i = 0; i < MAX8998_NUM_IRQ_REGS; i++) { + max8998->irq_masks_cur[i] = 0xff; + max8998->irq_masks_cache[i] = 0xff; + max8998_write_reg(max8998->i2c, MAX8998_REG_IRQM1 + i, 0xff); + } + + max8998_write_reg(max8998->i2c, MAX8998_REG_STATUSM1, 0xff); + max8998_write_reg(max8998->i2c, MAX8998_REG_STATUSM2, 0xff); + + /* register with genirq */ + for (i = 0; i < MAX8998_IRQ_NR; i++) { + cur_irq = i + max8998->irq_base; + set_irq_chip_data(cur_irq, max8998); + set_irq_chip_and_handler(cur_irq, &max8998_irq_chip, + handle_edge_irq); + set_irq_nested_thread(cur_irq, 1); +#ifdef CONFIG_ARM + set_irq_flags(cur_irq, IRQF_VALID); +#else + set_irq_noprobe(cur_irq); +#endif + } + + ret = request_threaded_irq(max8998->irq, NULL, max8998_irq_thread, + IRQF_TRIGGER_FALLING | IRQF_ONESHOT, + "max8998-irq", max8998); + if (ret) { + dev_err(max8998->dev, "Failed to request IRQ %d: %d\n", + max8998->irq, ret); + return ret; + } + + if (!max8998->ono) + return 0; + + ret = request_threaded_irq(max8998->ono, NULL, max8998_irq_thread, + IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING | + IRQF_ONESHOT, "max8998-ono", max8998); + if (ret) + dev_err(max8998->dev, "Failed to request IRQ %d: %d\n", + max8998->ono, ret); + + return 0; +} + +void max8998_irq_exit(struct max8998_dev *max8998) +{ + if (max8998->ono) + free_irq(max8998->ono, max8998); + + if (max8998->irq) + free_irq(max8998->irq, max8998); +} |