mfd: Convert wm8994 to use generic regmap irq_chip

Factor out the irq_chip implementation, substantially reducing the code
size for the driver.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Samuel Ortiz <sameo@linux.intel.com>

2 files changed, 34 insertions, 163 deletions

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index f1391c21ef26..017f6dbab333 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -477,6 +477,7 @@ config MFD_WM8994
         bool "Support Wolfson Microelectronics WM8994"
         select MFD_CORE
         select REGMAP_I2C
+        select REGMAP_IRQ
         depends on I2C=y && GENERIC_HARDIRQS
         help
           The WM8994 is a highly integrated hi-fi CODEC designed for
diff --git a/drivers/mfd/wm8994-irq.c b/drivers/mfd/wm8994-irq.c
index f9dd6b691258..46b20c445ecf 100644
--- a/drivers/mfd/wm8994-irq.c
+++ b/drivers/mfd/wm8994-irq.c
@@ -18,238 +18,127 @@
 #include <linux/irq.h>
 #include <linux/mfd/core.h>
 #include <linux/interrupt.h>
+#include <linux/regmap.h>
 
 #include <linux/mfd/wm8994/core.h>
 #include <linux/mfd/wm8994/registers.h>
 
 #include <linux/delay.h>
 
-struct wm8994_irq_data {
-        int reg;
-        int mask;
-};
-
-static struct wm8994_irq_data wm8994_irqs[] = {
+static struct regmap_irq wm8994_irqs[] = {
         [WM8994_IRQ_TEMP_SHUT] = {
-                .reg = 2,
+                .reg_offset = 1,
                 .mask = WM8994_TEMP_SHUT_EINT,
         },
         [WM8994_IRQ_MIC1_DET] = {
-                .reg = 2,
+                .reg_offset = 1,
                 .mask = WM8994_MIC1_DET_EINT,
         },
         [WM8994_IRQ_MIC1_SHRT] = {
-                .reg = 2,
+                .reg_offset = 1,
                 .mask = WM8994_MIC1_SHRT_EINT,
         },
         [WM8994_IRQ_MIC2_DET] = {
-                .reg = 2,
+                .reg_offset = 1,
                 .mask = WM8994_MIC2_DET_EINT,
         },
         [WM8994_IRQ_MIC2_SHRT] = {
-                .reg = 2,
+                .reg_offset = 1,
                 .mask = WM8994_MIC2_SHRT_EINT,
         },
         [WM8994_IRQ_FLL1_LOCK] = {
-                .reg = 2,
+                .reg_offset = 1,
                 .mask = WM8994_FLL1_LOCK_EINT,
         },
         [WM8994_IRQ_FLL2_LOCK] = {
-                .reg = 2,
+                .reg_offset = 1,
                 .mask = WM8994_FLL2_LOCK_EINT,
         },
         [WM8994_IRQ_SRC1_LOCK] = {
-                .reg = 2,
+                .reg_offset = 1,
                 .mask = WM8994_SRC1_LOCK_EINT,
         },
         [WM8994_IRQ_SRC2_LOCK] = {
-                .reg = 2,
+                .reg_offset = 1,
                 .mask = WM8994_SRC2_LOCK_EINT,
         },
         [WM8994_IRQ_AIF1DRC1_SIG_DET] = {
-                .reg = 2,
+                .reg_offset = 1,
                 .mask = WM8994_AIF1DRC1_SIG_DET,
         },
         [WM8994_IRQ_AIF1DRC2_SIG_DET] = {
-                .reg = 2,
+                .reg_offset = 1,
                 .mask = WM8994_AIF1DRC2_SIG_DET_EINT,
         },
         [WM8994_IRQ_AIF2DRC_SIG_DET] = {
-                .reg = 2,
+                .reg_offset = 1,
                 .mask = WM8994_AIF2DRC_SIG_DET_EINT,
         },
         [WM8994_IRQ_FIFOS_ERR] = {
-                .reg = 2,
+                .reg_offset = 1,
                 .mask = WM8994_FIFOS_ERR_EINT,
         },
         [WM8994_IRQ_WSEQ_DONE] = {
-                .reg = 2,
+                .reg_offset = 1,
                 .mask = WM8994_WSEQ_DONE_EINT,
         },
         [WM8994_IRQ_DCS_DONE] = {
-                .reg = 2,
+                .reg_offset = 1,
                 .mask = WM8994_DCS_DONE_EINT,
         },
         [WM8994_IRQ_TEMP_WARN] = {
-                .reg = 2,
+                .reg_offset = 1,
                 .mask = WM8994_TEMP_WARN_EINT,
         },
         [WM8994_IRQ_GPIO(1)] = {
-                .reg = 1,
                 .mask = WM8994_GP1_EINT,
         },
         [WM8994_IRQ_GPIO(2)] = {
-                .reg = 1,
                 .mask = WM8994_GP2_EINT,
         },
         [WM8994_IRQ_GPIO(3)] = {
-                .reg = 1,
                 .mask = WM8994_GP3_EINT,
         },
         [WM8994_IRQ_GPIO(4)] = {
-                .reg = 1,
                 .mask = WM8994_GP4_EINT,
         },
         [WM8994_IRQ_GPIO(5)] = {
-                .reg = 1,
                 .mask = WM8994_GP5_EINT,
         },
         [WM8994_IRQ_GPIO(6)] = {
-                .reg = 1,
                 .mask = WM8994_GP6_EINT,
         },
         [WM8994_IRQ_GPIO(7)] = {
-                .reg = 1,
                 .mask = WM8994_GP7_EINT,
         },
         [WM8994_IRQ_GPIO(8)] = {
-                .reg = 1,
                 .mask = WM8994_GP8_EINT,
         },
         [WM8994_IRQ_GPIO(9)] = {
-                .reg = 1,
                 .mask = WM8994_GP8_EINT,
         },
         [WM8994_IRQ_GPIO(10)] = {
-                .reg = 1,
                 .mask = WM8994_GP10_EINT,
         },
         [WM8994_IRQ_GPIO(11)] = {
-                .reg = 1,
                 .mask = WM8994_GP11_EINT,
         },
 };
 
-static inline struct wm8994_irq_data *irq_to_wm8994_irq(struct wm8994 *wm8994,
-                                                        int irq)
-{
-        return &wm8994_irqs[irq - wm8994->irq_base];
-}
-
-static void wm8994_irq_lock(struct irq_data *data)
-{
-        struct wm8994 *wm8994 = irq_data_get_irq_chip_data(data);
-
-        mutex_lock(&wm8994->irq_lock);
-}
-
-static void wm8994_irq_sync_unlock(struct irq_data *data)
-{
-        struct wm8994 *wm8994 = irq_data_get_irq_chip_data(data);
-        int i;
-
-        for (i = 0; i < ARRAY_SIZE(wm8994->irq_masks_cur); i++) {
-                /* If there's been a change in the mask write it back
-                 * to the hardware. */
-                if (wm8994->irq_masks_cur[i] != wm8994->irq_masks_cache[i]) {
-                        wm8994->irq_masks_cache[i] = wm8994->irq_masks_cur[i];
-                        wm8994_reg_write(wm8994,
-                                         WM8994_INTERRUPT_STATUS_1_MASK + i,
-                                         wm8994->irq_masks_cur[i]);
-                }
-        }
-
-        mutex_unlock(&wm8994->irq_lock);
-}
-
-static void wm8994_irq_enable(struct irq_data *data)
-{
-        struct wm8994 *wm8994 = irq_data_get_irq_chip_data(data);
-        struct wm8994_irq_data *irq_data = irq_to_wm8994_irq(wm8994,
-                                                             data->irq);
-
-        wm8994->irq_masks_cur[irq_data->reg - 1] &= ~irq_data->mask;
-}
-
-static void wm8994_irq_disable(struct irq_data *data)
-{
-        struct wm8994 *wm8994 = irq_data_get_irq_chip_data(data);
-        struct wm8994_irq_data *irq_data = irq_to_wm8994_irq(wm8994,
-                                                             data->irq);
-
-        wm8994->irq_masks_cur[irq_data->reg - 1] |= irq_data->mask;
-}
+static struct regmap_irq_chip wm8994_irq_chip = {
+        .name = "wm8994",
+        .irqs = wm8994_irqs,
+        .num_irqs = ARRAY_SIZE(wm8994_irqs),
 
-static struct irq_chip wm8994_irq_chip = {
-        .name                   = "wm8994",
-        .irq_bus_lock           = wm8994_irq_lock,
-        .irq_bus_sync_unlock    = wm8994_irq_sync_unlock,
-        .irq_disable            = wm8994_irq_disable,
-        .irq_enable             = wm8994_irq_enable,
+        .num_regs = 2,
+        .status_base = WM8994_INTERRUPT_STATUS_1,
+        .mask_base = WM8994_INTERRUPT_STATUS_1_MASK,
+        .ack_base = WM8994_INTERRUPT_STATUS_1,
 };
 
-/* The processing of the primary interrupt occurs in a thread so that
- * we can interact with the device over I2C or SPI. */
-static irqreturn_t wm8994_irq_thread(int irq, void *data)
-{
-        struct wm8994 *wm8994 = data;
-        unsigned int i;
-        u16 status[WM8994_NUM_IRQ_REGS];
-        int ret;
-
-        ret = wm8994_bulk_read(wm8994, WM8994_INTERRUPT_STATUS_1,
-                               WM8994_NUM_IRQ_REGS, status);
-        if (ret < 0) {
-                dev_err(wm8994->dev, "Failed to read interrupt status: %d\n",
-                        ret);
-                return IRQ_NONE;
-        }
-
-        /* Bit swap and apply masking */
-        for (i = 0; i < WM8994_NUM_IRQ_REGS; i++) {
-                status[i] = be16_to_cpu(status[i]);
-                status[i] &= ~wm8994->irq_masks_cur[i];
-        }
-
-        /* Ack any unmasked IRQs */
-        for (i = 0; i < ARRAY_SIZE(status); i++) {
-                if (status[i])
-                        wm8994_reg_write(wm8994, WM8994_INTERRUPT_STATUS_1 + i,
-                                         status[i]);
-        }
-
-        /* Report */
-        for (i = 0; i < ARRAY_SIZE(wm8994_irqs); i++) {
-                if (status[wm8994_irqs[i].reg - 1] & wm8994_irqs[i].mask)
-                        handle_nested_irq(wm8994->irq_base + i);
-        }
-
-        return IRQ_HANDLED;
-}
-
 int wm8994_irq_init(struct wm8994 *wm8994)
 {
-        int i, cur_irq, ret;
-
-        mutex_init(&wm8994->irq_lock);
-
-        /* Mask the individual interrupt sources */
-        for (i = 0; i < ARRAY_SIZE(wm8994->irq_masks_cur); i++) {
-                wm8994->irq_masks_cur[i] = 0xffff;
-                wm8994->irq_masks_cache[i] = 0xffff;
-                wm8994_reg_write(wm8994, WM8994_INTERRUPT_STATUS_1_MASK + i,
-                                 0xffff);
-        }
+        int ret;
 
         if (!wm8994->irq) {
                 dev_warn(wm8994->dev,
@@ -264,30 +153,12 @@ int wm8994_irq_init(struct wm8994 *wm8994)
                 return 0;
         }
 
-        /* Register them with genirq */
-        for (cur_irq = wm8994->irq_base;
-             cur_irq < ARRAY_SIZE(wm8994_irqs) + wm8994->irq_base;
-             cur_irq++) {
-                irq_set_chip_data(cur_irq, wm8994);
-                irq_set_chip_and_handler(cur_irq, &wm8994_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(wm8994->irq, NULL, wm8994_irq_thread,
-                                   IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
-                                   "wm8994", wm8994);
+        ret = regmap_add_irq_chip(wm8994->regmap, wm8994->irq,
+                                  IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
+                                  wm8994->irq_base, &wm8994_irq_chip,
+                                  &wm8994->irq_data);
         if (ret != 0) {
-                dev_err(wm8994->dev, "Failed to request IRQ %d: %d\n",
-                        wm8994->irq, ret);
+                dev_err(wm8994->dev, "Failed to register IRQ chip: %d\n", ret);
                 return ret;
         }
 
@@ -299,6 +170,5 @@ int wm8994_irq_init(struct wm8994 *wm8994)
 
 void wm8994_irq_exit(struct wm8994 *wm8994)
 {
-        if (wm8994->irq)
-                free_irq(wm8994->irq, wm8994);
+        regmap_del_irq_chip(wm8994->irq, wm8994->irq_data);
 }