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path: root/drivers/mfd/lp8788-irq.c
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Diffstat (limited to 'drivers/mfd/lp8788-irq.c')
-rw-r--r--drivers/mfd/lp8788-irq.c200
1 files changed, 200 insertions, 0 deletions
diff --git a/drivers/mfd/lp8788-irq.c b/drivers/mfd/lp8788-irq.c
new file mode 100644
index 000000000..23982dbf0
--- /dev/null
+++ b/drivers/mfd/lp8788-irq.c
@@ -0,0 +1,200 @@
+/*
+ * TI LP8788 MFD - interrupt handler
+ *
+ * Copyright 2012 Texas Instruments
+ *
+ * Author: Milo(Woogyom) Kim <milo.kim@ti.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/irqdomain.h>
+#include <linux/device.h>
+#include <linux/mfd/lp8788.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+
+/* register address */
+#define LP8788_INT_1 0x00
+#define LP8788_INTEN_1 0x03
+
+#define BASE_INTEN_ADDR LP8788_INTEN_1
+#define SIZE_REG 8
+#define NUM_REGS 3
+
+/*
+ * struct lp8788_irq_data
+ * @lp : used for accessing to lp8788 registers
+ * @irq_lock : mutex for enabling/disabling the interrupt
+ * @domain : IRQ domain for handling nested interrupt
+ * @enabled : status of enabled interrupt
+ */
+struct lp8788_irq_data {
+ struct lp8788 *lp;
+ struct mutex irq_lock;
+ struct irq_domain *domain;
+ int enabled[LP8788_INT_MAX];
+};
+
+static inline u8 _irq_to_addr(enum lp8788_int_id id)
+{
+ return id / SIZE_REG;
+}
+
+static inline u8 _irq_to_enable_addr(enum lp8788_int_id id)
+{
+ return _irq_to_addr(id) + BASE_INTEN_ADDR;
+}
+
+static inline u8 _irq_to_mask(enum lp8788_int_id id)
+{
+ return 1 << (id % SIZE_REG);
+}
+
+static inline u8 _irq_to_val(enum lp8788_int_id id, int enable)
+{
+ return enable << (id % SIZE_REG);
+}
+
+static void lp8788_irq_enable(struct irq_data *data)
+{
+ struct lp8788_irq_data *irqd = irq_data_get_irq_chip_data(data);
+
+ irqd->enabled[data->hwirq] = 1;
+}
+
+static void lp8788_irq_disable(struct irq_data *data)
+{
+ struct lp8788_irq_data *irqd = irq_data_get_irq_chip_data(data);
+
+ irqd->enabled[data->hwirq] = 0;
+}
+
+static void lp8788_irq_bus_lock(struct irq_data *data)
+{
+ struct lp8788_irq_data *irqd = irq_data_get_irq_chip_data(data);
+
+ mutex_lock(&irqd->irq_lock);
+}
+
+static void lp8788_irq_bus_sync_unlock(struct irq_data *data)
+{
+ struct lp8788_irq_data *irqd = irq_data_get_irq_chip_data(data);
+ enum lp8788_int_id irq = data->hwirq;
+ u8 addr, mask, val;
+
+ addr = _irq_to_enable_addr(irq);
+ mask = _irq_to_mask(irq);
+ val = _irq_to_val(irq, irqd->enabled[irq]);
+
+ lp8788_update_bits(irqd->lp, addr, mask, val);
+
+ mutex_unlock(&irqd->irq_lock);
+}
+
+static struct irq_chip lp8788_irq_chip = {
+ .name = "lp8788",
+ .irq_enable = lp8788_irq_enable,
+ .irq_disable = lp8788_irq_disable,
+ .irq_bus_lock = lp8788_irq_bus_lock,
+ .irq_bus_sync_unlock = lp8788_irq_bus_sync_unlock,
+};
+
+static irqreturn_t lp8788_irq_handler(int irq, void *ptr)
+{
+ struct lp8788_irq_data *irqd = ptr;
+ struct lp8788 *lp = irqd->lp;
+ u8 status[NUM_REGS], addr, mask;
+ bool handled;
+ int i;
+
+ if (lp8788_read_multi_bytes(lp, LP8788_INT_1, status, NUM_REGS))
+ return IRQ_NONE;
+
+ for (i = 0 ; i < LP8788_INT_MAX ; i++) {
+ addr = _irq_to_addr(i);
+ mask = _irq_to_mask(i);
+
+ /* reporting only if the irq is enabled */
+ if (status[addr] & mask) {
+ handle_nested_irq(irq_find_mapping(irqd->domain, i));
+ handled = true;
+ }
+ }
+
+ return handled ? IRQ_HANDLED : IRQ_NONE;
+}
+
+static int lp8788_irq_map(struct irq_domain *d, unsigned int virq,
+ irq_hw_number_t hwirq)
+{
+ struct lp8788_irq_data *irqd = d->host_data;
+ struct irq_chip *chip = &lp8788_irq_chip;
+
+ irq_set_chip_data(virq, irqd);
+ irq_set_chip_and_handler(virq, chip, handle_edge_irq);
+ irq_set_nested_thread(virq, 1);
+
+#ifdef CONFIG_ARM
+ set_irq_flags(virq, IRQF_VALID);
+#else
+ irq_set_noprobe(virq);
+#endif
+
+ return 0;
+}
+
+static struct irq_domain_ops lp8788_domain_ops = {
+ .map = lp8788_irq_map,
+};
+
+int lp8788_irq_init(struct lp8788 *lp, int irq)
+{
+ struct lp8788_irq_data *irqd;
+ int ret;
+
+ if (irq <= 0) {
+ dev_warn(lp->dev, "invalid irq number: %d\n", irq);
+ return 0;
+ }
+
+ irqd = devm_kzalloc(lp->dev, sizeof(*irqd), GFP_KERNEL);
+ if (!irqd)
+ return -ENOMEM;
+
+ irqd->lp = lp;
+ irqd->domain = irq_domain_add_linear(lp->dev->of_node, LP8788_INT_MAX,
+ &lp8788_domain_ops, irqd);
+ if (!irqd->domain) {
+ dev_err(lp->dev, "failed to add irq domain err\n");
+ return -EINVAL;
+ }
+
+ lp->irqdm = irqd->domain;
+ mutex_init(&irqd->irq_lock);
+
+ ret = request_threaded_irq(irq, NULL, lp8788_irq_handler,
+ IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
+ "lp8788-irq", irqd);
+ if (ret) {
+ dev_err(lp->dev, "failed to create a thread for IRQ_N\n");
+ return ret;
+ }
+
+ lp->irq = irq;
+
+ return 0;
+}
+
+void lp8788_irq_exit(struct lp8788 *lp)
+{
+ if (lp->irq)
+ free_irq(lp->irq, lp->irqdm);
+}