Merge tag 'regmap-v3.14' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap

Pull regmap updates from Mark Brown:
 "Nothing terribly exciting with regmap this release, mainly a few small
  extensions to allow more devices to be supported:

   - Allow the bulk I/O APIs to be used with no-bus regmaps
   - Support interrupt controllers with zero ack base
   - Warning and spelling fixes"

* tag 'regmap-v3.14' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap:
  regmap: fix a couple of typos
  regmap: Allow regmap_bulk_write() to work for "no-bus" regmaps
  regmap: Allow regmap_bulk_read() to work for "no-bus" regmaps
  regmap: irq: Allow using zero value for ack_base
  regmap: Fix 'ret' would return an uninitialized value

3 files changed, 54 insertions, 39 deletions

diff --git a/drivers/base/regmap/regmap-irq.c b/drivers/base/regmap/regmap-irq.c
index 763c60d3d277..82692068d3cb 100644
--- a/drivers/base/regmap/regmap-irq.c
+++ b/drivers/base/regmap/regmap-irq.c
@@ -113,7 +113,7 @@ static void regmap_irq_sync_unlock(struct irq_data *data)
                  * OR if there is masked interrupt which hasn't been Acked,
                  * it'll be ignored in irq handler, then may introduce irq storm
                  */
-                if (d->mask_buf[i] && d->chip->ack_base) {
+                if (d->mask_buf[i] && (d->chip->ack_base || d->chip->use_ack)) {
                         reg = d->chip->ack_base +
                                 (i * map->reg_stride * d->irq_reg_stride);
                         ret = regmap_write(map, reg, d->mask_buf[i]);
@@ -271,7 +271,7 @@ static irqreturn_t regmap_irq_thread(int irq, void *d)
         for (i = 0; i < data->chip->num_regs; i++) {
                 data->status_buf[i] &= ~data->mask_buf[i];
 
-                if (data->status_buf[i] && chip->ack_base) {
+                if (data->status_buf[i] && (chip->ack_base || chip->use_ack)) {
                         reg = chip->ack_base +
                                 (i * map->reg_stride * data->irq_reg_stride);
                         ret = regmap_write(map, reg, data->status_buf[i]);
@@ -448,7 +448,7 @@ int regmap_add_irq_chip(struct regmap *map, int irq, int irq_flags,
                         goto err_alloc;
                 }
 
-                if (d->status_buf[i] && chip->ack_base) {
+                if (d->status_buf[i] && (chip->ack_base || chip->use_ack)) {
                         reg = chip->ack_base +
                                 (i * map->reg_stride * d->irq_reg_stride);
                         ret = regmap_write(map, reg,
diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index c2e002100949..6a19515f8a45 100644
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -1514,21 +1514,49 @@ int regmap_bulk_write(struct regmap *map, unsigned int reg, const void *val,
 {
         int ret = 0, i;
         size_t val_bytes = map->format.val_bytes;
-        void *wval;
 
-        if (!map->bus)
-                return -EINVAL;
-        if (!map->format.parse_inplace)
+        if (map->bus && !map->format.parse_inplace)
                 return -EINVAL;
         if (reg % map->reg_stride)
                 return -EINVAL;
 
         map->lock(map->lock_arg);
+        /*
+         * Some devices don't support bulk write, for
+         * them we have a series of single write operations.
+         */
+        if (!map->bus || map->use_single_rw) {
+                for (i = 0; i < val_count; i++) {
+                        unsigned int ival;
+
+                        switch (val_bytes) {
+                        case 1:
+                                ival = *(u8 *)(val + (i * val_bytes));
+                                break;
+                        case 2:
+                                ival = *(u16 *)(val + (i * val_bytes));
+                                break;
+                        case 4:
+                                ival = *(u32 *)(val + (i * val_bytes));
+                                break;
+#ifdef CONFIG_64BIT
+                        case 8:
+                                ival = *(u64 *)(val + (i * val_bytes));
+                                break;
+#endif
+                        default:
+                                ret = -EINVAL;
+                                goto out;
+                        }
 
-        /* No formatting is require if val_byte is 1 */
-        if (val_bytes == 1) {
-                wval = (void *)val;
+                        ret = _regmap_write(map, reg + (i * map->reg_stride),
+                                        ival);
+                        if (ret != 0)
+                                goto out;
+                }
         } else {
+                void *wval;
+
                 wval = kmemdup(val, val_count * val_bytes, GFP_KERNEL);
                 if (!wval) {
                         ret = -ENOMEM;
@@ -1537,27 +1565,11 @@ int regmap_bulk_write(struct regmap *map, unsigned int reg, const void *val,
                 }
                 for (i = 0; i < val_count * val_bytes; i += val_bytes)
                         map->format.parse_inplace(wval + i);
-        }
-        /*
-         * Some devices does not support bulk write, for
-         * them we have a series of single write operations.
-         */
-        if (map->use_single_rw) {
-                for (i = 0; i < val_count; i++) {
-                        ret = _regmap_raw_write(map,
-                                                reg + (i * map->reg_stride),
-                                                val + (i * val_bytes),
-                                                val_bytes);
-                        if (ret != 0)
-                                goto out;
-                }
-        } else {
+
                 ret = _regmap_raw_write(map, reg, wval, val_bytes * val_count);
-        }
 
-        if (val_bytes != 1)
                 kfree(wval);
-
+        }
 out:
         map->unlock(map->lock_arg);
         return ret;
@@ -1897,14 +1909,10 @@ int regmap_bulk_read(struct regmap *map, unsigned int reg, void *val,
         size_t val_bytes = map->format.val_bytes;
         bool vol = regmap_volatile_range(map, reg, val_count);
 
-        if (!map->bus)
-                return -EINVAL;
-        if (!map->format.parse_inplace)
-                return -EINVAL;
         if (reg % map->reg_stride)
                 return -EINVAL;
 
-        if (vol || map->cache_type == REGCACHE_NONE) {
+        if (map->bus && map->format.parse_inplace && (vol || map->cache_type == REGCACHE_NONE)) {
                 /*
                  * Some devices does not support bulk read, for
                  * them we have a series of single read operations.
@@ -2173,6 +2181,10 @@ int regmap_register_patch(struct regmap *map, const struct reg_default *regs,
         int i, ret;
         bool bypass;
 
+        if (WARN_ONCE(num_regs <= 0, "invalid registers number (%d)\n",
+            num_regs))
+                return 0;
+
         map->lock(map->lock_arg);
 
         bypass = map->cache_bypass;
diff --git a/include/linux/regmap.h b/include/linux/regmap.h
index e55907804d39..4149f1a9b003 100644
--- a/include/linux/regmap.h
+++ b/include/linux/regmap.h
@@ -122,9 +122,9 @@ typedef void (*regmap_unlock)(void *);
  *                volatile_table (see below) is not, the check is performed on
  *                such table (a register is volatile if it belongs to one of
  *                the ranges specified by volatile_table).
- * @precious_reg: Optional callback returning true if the rgister
+ * @precious_reg: Optional callback returning true if the register
  *                should not be read outside of a call from the driver
- *                (eg, a clear on read interrupt status register). If this
+ *                (e.g., a clear on read interrupt status register). If this
  *                field is NULL but precious_table (see below) is not, the
  *                check is performed on such table (a register is precious if
  *                it belongs to one of the ranges specified by precious_table).
@@ -136,9 +136,9 @@ typedef void (*regmap_unlock)(void *);
  *                are not overridden).
  * @reg_read:     Optional callback that if filled will be used to perform
  *                all the reads from the registers. Should only be provided for
- *                devices whos read operation cannot be represented as a simple read
- *                operation on a bus such as SPI, I2C, etc. Most of the devices do
- *                not need this.
+ *                devices whose read operation cannot be represented as a simple
+ *                read operation on a bus such as SPI, I2C, etc. Most of the
+ *                devices do not need this.
  * @reg_write:    Same as above for writing.
  * @fast_io:      Register IO is fast. Use a spinlock instead of a mutex
  *                to perform locking. This field is ignored if custom lock/unlock
@@ -497,11 +497,13 @@ struct regmap_irq {
  *
  * @status_base: Base status register address.
  * @mask_base:   Base mask register address.
- * @ack_base:    Base ack address.  If zero then the chip is clear on read.
+ * @ack_base:    Base ack address. If zero then the chip is clear on read.
+ *               Using zero value is possible with @use_ack bit.
  * @wake_base:   Base address for wake enables.  If zero unsupported.
  * @irq_reg_stride:  Stride to use for chips where registers are not contiguous.
  * @init_ack_masked: Ack all masked interrupts once during initalization.
  * @mask_invert: Inverted mask register: cleared bits are masked out.
+ * @use_ack:     Use @ack register even if it is zero.
  * @wake_invert: Inverted wake register: cleared bits are wake enabled.
  * @runtime_pm:  Hold a runtime PM lock on the device when accessing it.
  *
@@ -520,6 +522,7 @@ struct regmap_irq_chip {
         unsigned int irq_reg_stride;
         bool init_ack_masked:1;
         bool mask_invert:1;
+        bool use_ack:1;
         bool wake_invert:1;
         bool runtime_pm:1;