mfd: Add basic tps6586x interrupt support

Add support for enabling and disabling tps6586x subdevice interrupts

Signed-off-by: Gary King <gking@nvidia.com>
Acked-by: Mike Rapoport <mike@compulab.co.il>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

2 files changed, 202 insertions, 2 deletions

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 01c928bca099..66779bdc9627 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -563,8 +563,8 @@ config MFD_JZ4740_ADC
           This driver is necessary for jz4740-battery and jz4740-hwmon driver.
 
 config MFD_TPS6586X
-        tristate "TPS6586x Power Management chips"
-        depends on I2C && GPIOLIB
+        bool "TPS6586x Power Management chips"
+        depends on I2C=y && GPIOLIB && GENERIC_HARDIRQS
         select MFD_CORE
         help
           If you say yes here you get support for the TPS6586X series of
diff --git a/drivers/mfd/tps6586x.c b/drivers/mfd/tps6586x.c
index 2f9336c3710c..117eb7cafe77 100644
--- a/drivers/mfd/tps6586x.c
+++ b/drivers/mfd/tps6586x.c
@@ -15,6 +15,8 @@
  * published by the Free Software Foundation.
  */
 
+#include <linux/interrupt.h>
+#include <linux/irq.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/mutex.h>
@@ -29,16 +31,76 @@
 #define TPS6586X_GPIOSET1       0x5d
 #define TPS6586X_GPIOSET2       0x5e
 
+/* interrupt control registers */
+#define TPS6586X_INT_ACK1       0xb5
+#define TPS6586X_INT_ACK2       0xb6
+#define TPS6586X_INT_ACK3       0xb7
+#define TPS6586X_INT_ACK4       0xb8
+
+/* interrupt mask registers */
+#define TPS6586X_INT_MASK1      0xb0
+#define TPS6586X_INT_MASK2      0xb1
+#define TPS6586X_INT_MASK3      0xb2
+#define TPS6586X_INT_MASK4      0xb3
+#define TPS6586X_INT_MASK5      0xb4
+
 /* device id */
 #define TPS6586X_VERSIONCRC     0xcd
 #define TPS658621A_VERSIONCRC   0x15
 
+struct tps6586x_irq_data {
+        u8      mask_reg;
+        u8      mask_mask;
+};
+
+#define TPS6586X_IRQ(_reg, _mask)                               \
+        {                                                       \
+                .mask_reg = (_reg) - TPS6586X_INT_MASK1,        \
+                .mask_mask = (_mask),                           \
+        }
+
+static const struct tps6586x_irq_data tps6586x_irqs[] = {
+        [TPS6586X_INT_PLDO_0]   = TPS6586X_IRQ(TPS6586X_INT_MASK1, 1 << 0),
+        [TPS6586X_INT_PLDO_1]   = TPS6586X_IRQ(TPS6586X_INT_MASK1, 1 << 1),
+        [TPS6586X_INT_PLDO_2]   = TPS6586X_IRQ(TPS6586X_INT_MASK1, 1 << 2),
+        [TPS6586X_INT_PLDO_3]   = TPS6586X_IRQ(TPS6586X_INT_MASK1, 1 << 3),
+        [TPS6586X_INT_PLDO_4]   = TPS6586X_IRQ(TPS6586X_INT_MASK1, 1 << 4),
+        [TPS6586X_INT_PLDO_5]   = TPS6586X_IRQ(TPS6586X_INT_MASK1, 1 << 5),
+        [TPS6586X_INT_PLDO_6]   = TPS6586X_IRQ(TPS6586X_INT_MASK1, 1 << 6),
+        [TPS6586X_INT_PLDO_7]   = TPS6586X_IRQ(TPS6586X_INT_MASK1, 1 << 7),
+        [TPS6586X_INT_COMP_DET] = TPS6586X_IRQ(TPS6586X_INT_MASK4, 1 << 0),
+        [TPS6586X_INT_ADC]      = TPS6586X_IRQ(TPS6586X_INT_MASK2, 1 << 1),
+        [TPS6586X_INT_PLDO_8]   = TPS6586X_IRQ(TPS6586X_INT_MASK2, 1 << 2),
+        [TPS6586X_INT_PLDO_9]   = TPS6586X_IRQ(TPS6586X_INT_MASK2, 1 << 3),
+        [TPS6586X_INT_PSM_0]    = TPS6586X_IRQ(TPS6586X_INT_MASK2, 1 << 4),
+        [TPS6586X_INT_PSM_1]    = TPS6586X_IRQ(TPS6586X_INT_MASK2, 1 << 5),
+        [TPS6586X_INT_PSM_2]    = TPS6586X_IRQ(TPS6586X_INT_MASK2, 1 << 6),
+        [TPS6586X_INT_PSM_3]    = TPS6586X_IRQ(TPS6586X_INT_MASK2, 1 << 7),
+        [TPS6586X_INT_RTC_ALM1] = TPS6586X_IRQ(TPS6586X_INT_MASK5, 1 << 4),
+        [TPS6586X_INT_ACUSB_OVP] = TPS6586X_IRQ(TPS6586X_INT_MASK5, 0x03),
+        [TPS6586X_INT_USB_DET]  = TPS6586X_IRQ(TPS6586X_INT_MASK5, 1 << 2),
+        [TPS6586X_INT_AC_DET]   = TPS6586X_IRQ(TPS6586X_INT_MASK5, 1 << 3),
+        [TPS6586X_INT_BAT_DET]  = TPS6586X_IRQ(TPS6586X_INT_MASK3, 1 << 0),
+        [TPS6586X_INT_CHG_STAT] = TPS6586X_IRQ(TPS6586X_INT_MASK4, 0xfc),
+        [TPS6586X_INT_CHG_TEMP] = TPS6586X_IRQ(TPS6586X_INT_MASK3, 0x06),
+        [TPS6586X_INT_PP]       = TPS6586X_IRQ(TPS6586X_INT_MASK3, 0xf0),
+        [TPS6586X_INT_RESUME]   = TPS6586X_IRQ(TPS6586X_INT_MASK5, 1 << 5),
+        [TPS6586X_INT_LOW_SYS]  = TPS6586X_IRQ(TPS6586X_INT_MASK5, 1 << 6),
+        [TPS6586X_INT_RTC_ALM2] = TPS6586X_IRQ(TPS6586X_INT_MASK4, 1 << 1),
+};
+
 struct tps6586x {
         struct mutex            lock;
         struct device           *dev;
         struct i2c_client       *client;
 
         struct gpio_chip        gpio;
+        struct irq_chip         irq_chip;
+        struct mutex            irq_lock;
+        int                     irq_base;
+        u32                     irq_en;
+        u8                      mask_cache[5];
+        u8                      mask_reg[5];
 };
 
 static inline int __tps6586x_read(struct i2c_client *client,
@@ -262,6 +324,129 @@ static int tps6586x_remove_subdevs(struct tps6586x *tps6586x)
         return device_for_each_child(tps6586x->dev, NULL, __remove_subdev);
 }
 
+static void tps6586x_irq_lock(unsigned int irq)
+{
+        struct tps6586x *tps6586x = get_irq_chip_data(irq);
+
+        mutex_lock(&tps6586x->irq_lock);
+}
+
+static void tps6586x_irq_enable(unsigned int irq)
+{
+        struct tps6586x *tps6586x = get_irq_chip_data(irq);
+        unsigned int __irq = irq - tps6586x->irq_base;
+        const struct tps6586x_irq_data *data = &tps6586x_irqs[__irq];
+
+        tps6586x->mask_reg[data->mask_reg] &= ~data->mask_mask;
+        tps6586x->irq_en |= (1 << __irq);
+}
+
+static void tps6586x_irq_disable(unsigned int irq)
+{
+        struct tps6586x *tps6586x = get_irq_chip_data(irq);
+
+        unsigned int __irq = irq - tps6586x->irq_base;
+        const struct tps6586x_irq_data *data = &tps6586x_irqs[__irq];
+
+        tps6586x->mask_reg[data->mask_reg] |= data->mask_mask;
+        tps6586x->irq_en &= ~(1 << __irq);
+}
+
+static void tps6586x_irq_sync_unlock(unsigned int irq)
+{
+        struct tps6586x *tps6586x = get_irq_chip_data(irq);
+        int i;
+
+        for (i = 0; i < ARRAY_SIZE(tps6586x->mask_reg); i++) {
+                if (tps6586x->mask_reg[i] != tps6586x->mask_cache[i]) {
+                        if (!WARN_ON(tps6586x_write(tps6586x->dev,
+                                                    TPS6586X_INT_MASK1 + i,
+                                                    tps6586x->mask_reg[i])))
+                                tps6586x->mask_cache[i] = tps6586x->mask_reg[i];
+                }
+        }
+
+        mutex_unlock(&tps6586x->irq_lock);
+}
+
+static irqreturn_t tps6586x_irq(int irq, void *data)
+{
+        struct tps6586x *tps6586x = data;
+        u32 acks;
+        int ret = 0;
+
+        ret = tps6586x_reads(tps6586x->dev, TPS6586X_INT_ACK1,
+                             sizeof(acks), (uint8_t *)&acks);
+
+        if (ret < 0) {
+                dev_err(tps6586x->dev, "failed to read interrupt status\n");
+                return IRQ_NONE;
+        }
+
+        acks = le32_to_cpu(acks);
+
+        while (acks) {
+                int i = __ffs(acks);
+
+                if (tps6586x->irq_en & (1 << i))
+                        handle_nested_irq(tps6586x->irq_base + i);
+
+                acks &= ~(1 << i);
+        }
+
+        return IRQ_HANDLED;
+}
+
+static int __devinit tps6586x_irq_init(struct tps6586x *tps6586x, int irq,
+                                       int irq_base)
+{
+        int i, ret;
+        u8 tmp[4];
+
+        if (!irq_base) {
+                dev_warn(tps6586x->dev, "No interrupt support on IRQ base\n");
+                return -EINVAL;
+        }
+
+        mutex_init(&tps6586x->irq_lock);
+        for (i = 0; i < 5; i++) {
+                tps6586x->mask_cache[i] = 0xff;
+                tps6586x->mask_reg[i] = 0xff;
+                tps6586x_write(tps6586x->dev, TPS6586X_INT_MASK1 + i, 0xff);
+        }
+
+        tps6586x_reads(tps6586x->dev, TPS6586X_INT_ACK1, sizeof(tmp), tmp);
+
+        tps6586x->irq_base = irq_base;
+
+        tps6586x->irq_chip.name = "tps6586x";
+        tps6586x->irq_chip.enable = tps6586x_irq_enable;
+        tps6586x->irq_chip.disable = tps6586x_irq_disable;
+        tps6586x->irq_chip.bus_lock = tps6586x_irq_lock;
+        tps6586x->irq_chip.bus_sync_unlock = tps6586x_irq_sync_unlock;
+
+        for (i = 0; i < ARRAY_SIZE(tps6586x_irqs); i++) {
+                int __irq = i + tps6586x->irq_base;
+                set_irq_chip_data(__irq, tps6586x);
+                set_irq_chip_and_handler(__irq, &tps6586x->irq_chip,
+                                         handle_simple_irq);
+                set_irq_nested_thread(__irq, 1);
+#ifdef CONFIG_ARM
+                set_irq_flags(__irq, IRQF_VALID);
+#endif
+        }
+
+        ret = request_threaded_irq(irq, NULL, tps6586x_irq, IRQF_ONESHOT,
+                                   "tps6586x", tps6586x);
+
+        if (!ret) {
+                device_init_wakeup(tps6586x->dev, 1);
+                enable_irq_wake(irq);
+        }
+
+        return ret;
+}
+
 static int __devinit tps6586x_add_subdevs(struct tps6586x *tps6586x,
                                           struct tps6586x_platform_data *pdata)
 {
@@ -327,6 +512,15 @@ static int __devinit tps6586x_i2c_probe(struct i2c_client *client,
 
         mutex_init(&tps6586x->lock);
 
+        if (client->irq) {
+                ret = tps6586x_irq_init(tps6586x, client->irq,
+                                        pdata->irq_base);
+                if (ret) {
+                        dev_err(&client->dev, "IRQ init failed: %d\n", ret);
+                        goto err_irq_init;
+                }
+        }
+
         ret = tps6586x_add_subdevs(tps6586x, pdata);
         if (ret) {
                 dev_err(&client->dev, "add devices failed: %d\n", ret);
@@ -338,6 +532,9 @@ static int __devinit tps6586x_i2c_probe(struct i2c_client *client,
         return 0;
 
 err_add_devs:
+        if (client->irq)
+                free_irq(client->irq, tps6586x);
+err_irq_init:
         kfree(tps6586x);
         return ret;
 }
@@ -348,6 +545,9 @@ static int __devexit tps6586x_i2c_remove(struct i2c_client *client)
         struct tps6586x_platform_data *pdata = client->dev.platform_data;
         int ret;
 
+        if (client->irq)
+                free_irq(client->irq, tps6586x);
+
         if (pdata->gpio_base) {
                 ret = gpiochip_remove(&tps6586x->gpio);
                 if (ret)