regmap: Updates for v6.11

There's one new feature here, a regmap_multi_reg_read() matching the
 existing write function which has some IIO users coming.  This allows
 atomic reads from multiple registers without the need to wrap a higher
 level lock in the client driver just for regmap (which already has locks
 anyway).  We also have one fix for the KUnit tests, and a bunch of
 cleanups.
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Merge tag 'regmap-v6.11' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap

Pull regmap updates from Mark Brown:
 "There's one new feature here, a regmap_multi_reg_read() matching the
  existing write function which has some IIO users coming.

  This allows atomic reads from multiple registers without the need to
  wrap a higher level lock in the client driver just for regmap (which
  already has locks anyway).

  We also have one fix for the KUnit tests, and a bunch of cleanups"

* tag 'regmap-v6.11' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap:
  regmap: kunit: Add test cases for regmap_multi_reg_(read,write}()
  regmap: Implement regmap_multi_reg_read()
  regmap-irq: handle const struct regmap_irq_sub_irq_map
  const_structs.checkpatch: add regmap structs
  regmap: add missing MODULE_DESCRIPTION() macros
  regmap-i2c: add missing MODULE_DESCRIPTION() macro
  regmap: kunit: Use array_size() and sizeof(*ptr) consistently
  regmap: maple: Switch to use kmemdup_array()
  regmap: cache: Switch to use kmemdup_array()
  regmap: cache: Use correct type of the rb_for_each() parameter
  regmap: Switch to use kmemdup_array()
  regmap: kunit: add missing MODULE_DESCRIPTION()
  regmap: kunit: Fix memory leaks in gen_regmap() and gen_raw_regmap()

drivers/base/regmap/regcache-maple.c

@@ -132,9 +132,9 @@ static int regcache_maple_drop(struct regmap *map, unsigned int min,
 			lower_index = mas.index;
 			lower_last = min -1;
 
-			lower = kmemdup(entry, ((min - mas.index) *
+			lower = kmemdup_array(entry,
-						sizeof(unsigned long)),
+					      min - mas.index, sizeof(*lower),
-					map->alloc_flags);
+					      map->alloc_flags);
 			if (!lower) {
 				ret = -ENOMEM;
 				goto out_unlocked;
@@ -145,10 +145,9 @@ static int regcache_maple_drop(struct regmap *map, unsigned int min,
 			upper_index = max + 1;
 			upper_last = mas.last;
 
-			upper = kmemdup(&entry[max - mas.index + 1],
+			upper = kmemdup_array(&entry[max - mas.index + 1],
-					((mas.last - max) *
+					      mas.last - max, sizeof(*upper),
-					 sizeof(unsigned long)),
+					      map->alloc_flags);
-					map->alloc_flags);
 			if (!upper) {
 				ret = -ENOMEM;
 				goto out_unlocked;

drivers/base/regmap/regcache.c

@@ -170,8 +170,8 @@ int regcache_init(struct regmap *map, const struct regmap_config *config)
 	 * a copy of it.
 	 */
 	if (config->reg_defaults) {
-		tmp_buf = kmemdup(config->reg_defaults, map->num_reg_defaults *
+		tmp_buf = kmemdup_array(config->reg_defaults, map->num_reg_defaults,
-				  sizeof(struct reg_default), GFP_KERNEL);
+					sizeof(*map->reg_defaults), GFP_KERNEL);
 		if (!tmp_buf)
 			return -ENOMEM;
 		map->reg_defaults = tmp_buf;
@@ -407,7 +407,7 @@ out:
 	 * have gone out of sync, force writes of all the paging
 	 * registers.
 	 */
-	rb_for_each(node, 0, &map->range_tree, rbtree_all) {
+	rb_for_each(node, NULL, &map->range_tree, rbtree_all) {
 		struct regmap_range_node *this =
 			rb_entry(node, struct regmap_range_node, node);
 

drivers/base/regmap/regmap-ac97.c

@@ -86,4 +86,5 @@ struct regmap *__devm_regmap_init_ac97(struct snd_ac97 *ac97,
 }
 EXPORT_SYMBOL_GPL(__devm_regmap_init_ac97);
 
+MODULE_DESCRIPTION("Register map access API - AC'97 support");
 MODULE_LICENSE("GPL v2");

drivers/base/regmap/regmap-i2c.c

@@ -397,4 +397,5 @@ struct regmap *__devm_regmap_init_i2c(struct i2c_client *i2c,
 }
 EXPORT_SYMBOL_GPL(__devm_regmap_init_i2c);
 
+MODULE_DESCRIPTION("Register map access API - I2C support");
 MODULE_LICENSE("GPL");

drivers/base/regmap/regmap-irq.c

@@ -305,8 +305,8 @@ static inline int read_sub_irq_data(struct regmap_irq_chip_data *data,
 					   unsigned int b)
 {
 	const struct regmap_irq_chip *chip = data->chip;
+	const struct regmap_irq_sub_irq_map *subreg;
 	struct regmap *map = data->map;
-	struct regmap_irq_sub_irq_map *subreg;
 	unsigned int reg;
 	int i, ret = 0;
 

drivers/base/regmap/regmap-kunit.c

@@ -145,9 +145,9 @@ static struct regmap *gen_regmap(struct kunit *test,
 	const struct regmap_test_param *param = test->param_value;
 	struct regmap_test_priv *priv = test->priv;
 	unsigned int *buf;
-	struct regmap *ret;
+	struct regmap *ret = ERR_PTR(-ENOMEM);
 	size_t size;
-	int i;
+	int i, error;
 	struct reg_default *defaults;
 
 	config->cache_type = param->cache;
@@ -163,7 +163,7 @@ static struct regmap *gen_regmap(struct kunit *test,
 			config->max_register += (BLOCK_TEST_SIZE * config->reg_stride);
 	}
 
-	size = (config->max_register + 1) * sizeof(unsigned int);
+	size = array_size(config->max_register + 1, sizeof(*buf));
 	buf = kmalloc(size, GFP_KERNEL);
 	if (!buf)
 		return ERR_PTR(-ENOMEM);
@@ -172,15 +172,17 @@ static struct regmap *gen_regmap(struct kunit *test,
 
 	*data = kzalloc(sizeof(**data), GFP_KERNEL);
 	if (!(*data))
-		return ERR_PTR(-ENOMEM);
+		goto out_free;
 	(*data)->vals = buf;
 
 	if (config->num_reg_defaults) {
-		defaults = kcalloc(config->num_reg_defaults,
+		defaults = kunit_kcalloc(test,
-				   sizeof(struct reg_default),
+					 config->num_reg_defaults,
-				   GFP_KERNEL);
+					 sizeof(struct reg_default),
+					 GFP_KERNEL);
 		if (!defaults)
-			return ERR_PTR(-ENOMEM);
+			goto out_free;
+
 		config->reg_defaults = defaults;
 
 		for (i = 0; i < config->num_reg_defaults; i++) {
@@ -190,12 +192,19 @@ static struct regmap *gen_regmap(struct kunit *test,
 	}
 
 	ret = regmap_init_ram(priv->dev, config, *data);
-	if (IS_ERR(ret)) {
+	if (IS_ERR(ret))
-		kfree(buf);
+		goto out_free;
-		kfree(*data);
+
-	} else {
+	/* This calls regmap_exit() on failure, which frees buf and *data */
-		kunit_add_action(test, regmap_exit_action, ret);
+	error = kunit_add_action_or_reset(test, regmap_exit_action, ret);
-	}
+	if (error)
+		ret = ERR_PTR(error);
+
+	return ret;
+
+out_free:
+	kfree(buf);
+	kfree(*data);
 
 	return ret;
 }
@@ -295,6 +304,77 @@ static void bulk_read(struct kunit *test)
 		KUNIT_EXPECT_EQ(test, config.cache_type == REGCACHE_NONE, data->read[i]);
 }
 
+static void multi_write(struct kunit *test)
+{
+	struct regmap *map;
+	struct regmap_config config;
+	struct regmap_ram_data *data;
+	struct reg_sequence sequence[BLOCK_TEST_SIZE];
+	unsigned int val[BLOCK_TEST_SIZE], rval[BLOCK_TEST_SIZE];
+	int i;
+
+	config = test_regmap_config;
+
+	map = gen_regmap(test, &config, &data);
+	KUNIT_ASSERT_FALSE(test, IS_ERR(map));
+	if (IS_ERR(map))
+		return;
+
+	get_random_bytes(&val, sizeof(val));
+
+	/*
+	 * Data written via the multi API can be read back with single
+	 * reads.
+	 */
+	for (i = 0; i < BLOCK_TEST_SIZE; i++) {
+		sequence[i].reg = i;
+		sequence[i].def = val[i];
+		sequence[i].delay_us = 0;
+	}
+	KUNIT_EXPECT_EQ(test, 0,
+			regmap_multi_reg_write(map, sequence, BLOCK_TEST_SIZE));
+	for (i = 0; i < BLOCK_TEST_SIZE; i++)
+		KUNIT_EXPECT_EQ(test, 0, regmap_read(map, i, &rval[i]));
+
+	KUNIT_EXPECT_MEMEQ(test, val, rval, sizeof(val));
+
+	/* If using a cache the cache satisfied the read */
+	for (i = 0; i < BLOCK_TEST_SIZE; i++)
+		KUNIT_EXPECT_EQ(test, config.cache_type == REGCACHE_NONE, data->read[i]);
+}
+
+static void multi_read(struct kunit *test)
+{
+	struct regmap *map;
+	struct regmap_config config;
+	struct regmap_ram_data *data;
+	unsigned int regs[BLOCK_TEST_SIZE];
+	unsigned int val[BLOCK_TEST_SIZE], rval[BLOCK_TEST_SIZE];
+	int i;
+
+	config = test_regmap_config;
+
+	map = gen_regmap(test, &config, &data);
+	KUNIT_ASSERT_FALSE(test, IS_ERR(map));
+	if (IS_ERR(map))
+		return;
+
+	get_random_bytes(&val, sizeof(val));
+
+	/* Data written as single writes can be read via the multi API */
+	for (i = 0; i < BLOCK_TEST_SIZE; i++) {
+		regs[i] = i;
+		KUNIT_EXPECT_EQ(test, 0, regmap_write(map, i, val[i]));
+	}
+	KUNIT_EXPECT_EQ(test, 0,
+			regmap_multi_reg_read(map, regs, rval, BLOCK_TEST_SIZE));
+	KUNIT_EXPECT_MEMEQ(test, val, rval, sizeof(val));
+
+	/* If using a cache the cache satisfied the read */
+	for (i = 0; i < BLOCK_TEST_SIZE; i++)
+		KUNIT_EXPECT_EQ(test, config.cache_type == REGCACHE_NONE, data->read[i]);
+}
+
 static void read_bypassed(struct kunit *test)
 {
 	const struct regmap_test_param *param = test->param_value;
@@ -759,10 +839,9 @@ static void stress_insert(struct kunit *test)
 	if (IS_ERR(map))
 		return;
 
-	vals = kunit_kcalloc(test, sizeof(unsigned long), config.max_register,
+	buf_sz = array_size(sizeof(*vals), config.max_register);
-			     GFP_KERNEL);
+	vals = kunit_kmalloc(test, buf_sz, GFP_KERNEL);
 	KUNIT_ASSERT_FALSE(test, vals == NULL);
-	buf_sz = sizeof(unsigned long) * config.max_register;
 
 	get_random_bytes(vals, buf_sz);
 
@@ -1497,16 +1576,17 @@ static struct regmap *gen_raw_regmap(struct kunit *test,
 	struct regmap_test_priv *priv = test->priv;
 	const struct regmap_test_param *param = test->param_value;
 	u16 *buf;
-	struct regmap *ret;
+	struct regmap *ret = ERR_PTR(-ENOMEM);
-	size_t size = (config->max_register + 1) * config->reg_bits / 8;
+	int i, error;
-	int i;
 	struct reg_default *defaults;
+	size_t size;
 
 	config->cache_type = param->cache;
 	config->val_format_endian = param->val_endian;
 	config->disable_locking = config->cache_type == REGCACHE_RBTREE ||
 					config->cache_type == REGCACHE_MAPLE;
 
+	size = array_size(config->max_register + 1, BITS_TO_BYTES(config->reg_bits));
 	buf = kmalloc(size, GFP_KERNEL);
 	if (!buf)
 		return ERR_PTR(-ENOMEM);
@@ -1515,15 +1595,16 @@ static struct regmap *gen_raw_regmap(struct kunit *test,
 
 	*data = kzalloc(sizeof(**data), GFP_KERNEL);
 	if (!(*data))
-		return ERR_PTR(-ENOMEM);
+		goto out_free;
 	(*data)->vals = (void *)buf;
 
 	config->num_reg_defaults = config->max_register + 1;
-	defaults = kcalloc(config->num_reg_defaults,
+	defaults = kunit_kcalloc(test,
-			   sizeof(struct reg_default),
+				 config->num_reg_defaults,
-			   GFP_KERNEL);
+				 sizeof(struct reg_default),
+				 GFP_KERNEL);
 	if (!defaults)
-		return ERR_PTR(-ENOMEM);
+		goto out_free;
 	config->reg_defaults = defaults;
 
 	for (i = 0; i < config->num_reg_defaults; i++) {
@@ -1536,7 +1617,8 @@ static struct regmap *gen_raw_regmap(struct kunit *test,
 			defaults[i].def = be16_to_cpu(buf[i]);
 			break;
 		default:
-			return ERR_PTR(-EINVAL);
+			ret = ERR_PTR(-EINVAL);
+			goto out_free;
 		}
 	}
 
@@ -1548,12 +1630,19 @@ static struct regmap *gen_raw_regmap(struct kunit *test,
 		config->num_reg_defaults = 0;
 
 	ret = regmap_init_raw_ram(priv->dev, config, *data);
-	if (IS_ERR(ret)) {
+	if (IS_ERR(ret))
-		kfree(buf);
+		goto out_free;
-		kfree(*data);
+
-	} else {
+	/* This calls regmap_exit() on failure, which frees buf and *data */
-		kunit_add_action(test, regmap_exit_action, ret);
+	error = kunit_add_action_or_reset(test, regmap_exit_action, ret);
-	}
+	if (error)
+		ret = ERR_PTR(error);
+
+	return ret;
+
+out_free:
+	kfree(buf);
+	kfree(*data);
 
 	return ret;
 }
@@ -1597,7 +1686,7 @@ static void raw_read_defaults(struct kunit *test)
 	if (IS_ERR(map))
 		return;
 
-	val_len = sizeof(*rval) * (config.max_register + 1);
+	val_len = array_size(sizeof(*rval), config.max_register + 1);
 	rval = kunit_kmalloc(test, val_len, GFP_KERNEL);
 	KUNIT_ASSERT_TRUE(test, rval != NULL);
 	if (!rval)
@@ -1887,6 +1976,8 @@ static struct kunit_case regmap_test_cases[] = {
 	KUNIT_CASE_PARAM(read_bypassed_volatile, real_cache_types_gen_params),
 	KUNIT_CASE_PARAM(bulk_write, regcache_types_gen_params),
 	KUNIT_CASE_PARAM(bulk_read, regcache_types_gen_params),
+	KUNIT_CASE_PARAM(multi_write, regcache_types_gen_params),
+	KUNIT_CASE_PARAM(multi_read, regcache_types_gen_params),
 	KUNIT_CASE_PARAM(write_readonly, regcache_types_gen_params),
 	KUNIT_CASE_PARAM(read_writeonly, regcache_types_gen_params),
 	KUNIT_CASE_PARAM(reg_defaults, regcache_types_gen_params),
@@ -1958,4 +2049,5 @@ static struct kunit_suite regmap_test_suite = {
 };
 kunit_test_suite(regmap_test_suite);
 
+MODULE_DESCRIPTION("Regmap KUnit tests");
 MODULE_LICENSE("GPL v2");

drivers/base/regmap/regmap-ram.c

@@ -83,4 +83,5 @@ struct regmap *__regmap_init_ram(struct device *dev,
 }
 EXPORT_SYMBOL_GPL(__regmap_init_ram);
 
+MODULE_DESCRIPTION("Register map access API - Memory region");
 MODULE_LICENSE("GPL v2");

drivers/base/regmap/regmap-raw-ram.c

@@ -142,4 +142,5 @@ struct regmap *__regmap_init_raw_ram(struct device *dev,
 }
 EXPORT_SYMBOL_GPL(__regmap_init_raw_ram);
 
+MODULE_DESCRIPTION("Register map access API - Memory region with raw access");
 MODULE_LICENSE("GPL v2");

drivers/base/regmap/regmap-sccb.c

@@ -125,4 +125,5 @@ struct regmap *__devm_regmap_init_sccb(struct i2c_client *i2c,
 }
 EXPORT_SYMBOL_GPL(__devm_regmap_init_sccb);
 
+MODULE_DESCRIPTION("Register map access API - SCCB support");
 MODULE_LICENSE("GPL v2");

drivers/base/regmap/regmap-slimbus.c

@@ -68,4 +68,5 @@ struct regmap *__devm_regmap_init_slimbus(struct slim_device *slimbus,
 }
 EXPORT_SYMBOL_GPL(__devm_regmap_init_slimbus);
 
+MODULE_DESCRIPTION("Register map access API - SLIMbus support");
 MODULE_LICENSE("GPL v2");

drivers/base/regmap/regmap-spi-avmm.c

@@ -710,4 +710,5 @@ struct regmap *__devm_regmap_init_spi_avmm(struct spi_device *spi,
 }
 EXPORT_SYMBOL_GPL(__devm_regmap_init_spi_avmm);
 
+MODULE_DESCRIPTION("Register map access API - SPI AVMM support");
 MODULE_LICENSE("GPL v2");

drivers/base/regmap/regmap-spmi.c

@@ -222,4 +222,5 @@ struct regmap *__devm_regmap_init_spmi_ext(struct spmi_device *sdev,
 }
 EXPORT_SYMBOL_GPL(__devm_regmap_init_spmi_ext);
 
+MODULE_DESCRIPTION("Register map access API - SPMI support");
 MODULE_LICENSE("GPL");

drivers/base/regmap/regmap-w1.c

@@ -234,4 +234,5 @@ struct regmap *__devm_regmap_init_w1(struct device *w1_dev,
 }
 EXPORT_SYMBOL_GPL(__devm_regmap_init_w1);
 
+MODULE_DESCRIPTION("Register map access API - W1 (1-Wire) support");
 MODULE_LICENSE("GPL");

drivers/base/regmap/regmap.c

@@ -2347,7 +2347,7 @@ out:
 	} else {
 		void *wval;
 
-		wval = kmemdup(val, val_count * val_bytes, map->alloc_flags);
+		wval = kmemdup_array(val, val_count, val_bytes, map->alloc_flags);
 		if (!wval)
 			return -ENOMEM;
 
@@ -3101,8 +3101,53 @@ int regmap_fields_read(struct regmap_field *field, unsigned int id,
 }
 EXPORT_SYMBOL_GPL(regmap_fields_read);
 
+static int _regmap_bulk_read(struct regmap *map, unsigned int reg,
+			     unsigned int *regs, void *val, size_t val_count)
+{
+	u32 *u32 = val;
+	u16 *u16 = val;
+	u8 *u8 = val;
+	int ret, i;
+
+	map->lock(map->lock_arg);
+
+	for (i = 0; i < val_count; i++) {
+		unsigned int ival;
+
+		if (regs) {
+			if (!IS_ALIGNED(regs[i], map->reg_stride)) {
+				ret = -EINVAL;
+				goto out;
+			}
+			ret = _regmap_read(map, regs[i], &ival);
+		} else {
+			ret = _regmap_read(map, reg + regmap_get_offset(map, i), &ival);
+		}
+		if (ret != 0)
+			goto out;
+
+		switch (map->format.val_bytes) {
+		case 4:
+			u32[i] = ival;
+			break;
+		case 2:
+			u16[i] = ival;
+			break;
+		case 1:
+			u8[i] = ival;
+			break;
+		default:
+			ret = -EINVAL;
+			goto out;
+		}
+	}
+out:
+	map->unlock(map->lock_arg);
+	return ret;
+}
+
 /**
- * regmap_bulk_read() - Read multiple registers from the device
+ * regmap_bulk_read() - Read multiple sequential registers from the device
  *
  * @map: Register map to read from
  * @reg: First register to be read from
@@ -3132,47 +3177,35 @@ int regmap_bulk_read(struct regmap *map, unsigned int reg, void *val,
 		for (i = 0; i < val_count * val_bytes; i += val_bytes)
 			map->format.parse_inplace(val + i);
 	} else {
-		u32 *u32 = val;
+		ret = _regmap_bulk_read(map, reg, NULL, val, val_count);
-		u16 *u16 = val;
-		u8 *u8 = val;
-
-		map->lock(map->lock_arg);
-
-		for (i = 0; i < val_count; i++) {
-			unsigned int ival;
-
-			ret = _regmap_read(map, reg + regmap_get_offset(map, i),
-					   &ival);
-			if (ret != 0)
-				goto out;
-
-			switch (map->format.val_bytes) {
-			case 4:
-				u32[i] = ival;
-				break;
-			case 2:
-				u16[i] = ival;
-				break;
-			case 1:
-				u8[i] = ival;
-				break;
-			default:
-				ret = -EINVAL;
-				goto out;
-			}
-		}
-
-out:
-		map->unlock(map->lock_arg);
 	}
-
 	if (!ret)
 		trace_regmap_bulk_read(map, reg, val, val_bytes * val_count);
-
 	return ret;
 }
 EXPORT_SYMBOL_GPL(regmap_bulk_read);
 
+/**
+ * regmap_multi_reg_read() - Read multiple non-sequential registers from the device
+ *
+ * @map: Register map to read from
+ * @regs: Array of registers to read from
+ * @val: Pointer to store read value, in native register size for device
+ * @val_count: Number of registers to read
+ *
+ * A value of zero will be returned on success, a negative errno will
+ * be returned in error cases.
+ */
+int regmap_multi_reg_read(struct regmap *map, unsigned int *regs, void *val,
+			  size_t val_count)
+{
+	if (val_count == 0)
+		return -EINVAL;
+
+	return _regmap_bulk_read(map, 0, regs, val, val_count);
+}
+EXPORT_SYMBOL_GPL(regmap_multi_reg_read);
+
 static int _regmap_update_bits(struct regmap *map, unsigned int reg,
 			       unsigned int mask, unsigned int val,
 			       bool *change, bool force_write)

include/linux/regmap.h

@@ -1237,6 +1237,8 @@ int regmap_noinc_read(struct regmap *map, unsigned int reg,
 		      void *val, size_t val_len);
 int regmap_bulk_read(struct regmap *map, unsigned int reg, void *val,
 		     size_t val_count);
+int regmap_multi_reg_read(struct regmap *map, unsigned int *reg, void *val,
+			  size_t val_count);
 int regmap_update_bits_base(struct regmap *map, unsigned int reg,
 			    unsigned int mask, unsigned int val,
 			    bool *change, bool async, bool force);
@@ -1607,7 +1609,7 @@ struct regmap_irq_chip {
 
 	unsigned int main_status;
 	unsigned int num_main_status_bits;
-	struct regmap_irq_sub_irq_map *sub_reg_offsets;
+	const struct regmap_irq_sub_irq_map *sub_reg_offsets;
 	int num_main_regs;
 
 	unsigned int status_base;

scripts/const_structs.checkpatch

@@ -64,7 +64,17 @@ platform_suspend_ops
 proc_ops
 proto_ops
 pwm_ops
+reg_default
+reg_field
+reg_sequence
 regmap_access_table
+regmap_bus
+regmap_config
+regmap_irq
+regmap_irq_chip
+regmap_irq_sub_irq_map
+regmap_range
+regmap_range_cfg
 regulator_ops
 reset_control_ops
 rpc_pipe_ops