Gather the global variables under a single structure and allocate it with
devm_kzalloc(). It is easier to see them and if in the future we try to add
support for multiple instance of twl in the system it is going to be much
simpler.
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@xxxxxx>
---
drivers/mfd/twl-core.c | 104 +++++++++++++++++++++++++++----------------------
1 file changed, 57 insertions(+), 47 deletions(-)
diff --git a/drivers/mfd/twl-core.c b/drivers/mfd/twl-core.c
index 1827088..e2895a4 100644
--- a/drivers/mfd/twl-core.c
+++ b/drivers/mfd/twl-core.c
@@ -141,33 +141,28 @@
/*----------------------------------------------------------------------*/
-/* is driver active, bound to a chip? */
-static bool inuse;
-
-/* TWL IDCODE Register value */
-static u32 twl_idcode;
-
-static unsigned int twl_id;
-unsigned int twl_rev(void)
-{
- return twl_id;
-}
-EXPORT_SYMBOL(twl_rev);
-
/* Structure for each TWL4030/TWL6030 Slave */
struct twl_client {
struct i2c_client *client;
struct regmap *regmap;
};
-static struct twl_client *twl_modules;
-
/* mapping the module id to slave id and base address */
struct twl_mapping {
unsigned char sid; /* Slave ID */
unsigned char base; /* base address */
};
-static struct twl_mapping *twl_map;
+
+struct twl_private {
+ bool ready; /* The core driver is ready to be used */
+ u32 twl_idcode; /* TWL IDCODE Register value */
+ unsigned int twl_id;
+
+ struct twl_mapping *twl_map;
+ struct twl_client *twl_modules;
+};
+
+static struct twl_private *twl_priv;
static struct twl_mapping twl4030_map[] = {
/*
@@ -300,6 +295,12 @@ static inline int twl_get_last_module(void)
/* Exported Functions */
+unsigned int twl_rev(void)
+{
+ return twl_priv ? twl_priv->twl_id : 0;
+}
+EXPORT_SYMBOL(twl_rev);
+
/**
* twl_i2c_write - Writes a n bit register in TWL4030/TWL5030/TWL60X0
* @mod_no: module number
@@ -322,16 +323,17 @@ int twl_i2c_write(u8 mod_no, u8 *value, u8 reg, unsigned num_bytes)
pr_err("%s: invalid module number %d\n", DRIVER_NAME, mod_no);
return -EPERM;
}
- if (unlikely(!inuse)) {
+ if (unlikely(!twl_priv->ready)) {
pr_err("%s: not initialized\n", DRIVER_NAME);
return -EPERM;
}
- sid = twl_map[mod_no].sid;
- twl = &twl_modules[sid];
+ sid = twl_priv->twl_map[mod_no].sid;
+ twl = &twl_priv->twl_modules[sid];
- ret = regmap_bulk_write(twl->regmap, twl_map[mod_no].base + reg,
- value, num_bytes);
+ ret = regmap_bulk_write(twl->regmap,
+ twl_priv->twl_map[mod_no].base + reg, value,
+ num_bytes);
if (ret)
pr_err("%s: Write failed (mod %d, reg 0x%02x count %d)\n",
@@ -360,16 +362,17 @@ int twl_i2c_read(u8 mod_no, u8 *value, u8 reg, unsigned num_bytes)
pr_err("%s: invalid module number %d\n", DRIVER_NAME, mod_no);
return -EPERM;
}
- if (unlikely(!inuse)) {
+ if (unlikely(!twl_priv->ready)) {
pr_err("%s: not initialized\n", DRIVER_NAME);
return -EPERM;
}
- sid = twl_map[mod_no].sid;
- twl = &twl_modules[sid];
+ sid = twl_priv->twl_map[mod_no].sid;
+ twl = &twl_priv->twl_modules[sid];
- ret = regmap_bulk_read(twl->regmap, twl_map[mod_no].base + reg,
- value, num_bytes);
+ ret = regmap_bulk_read(twl->regmap,
+ twl_priv->twl_map[mod_no].base + reg, value,
+ num_bytes);
if (ret)
pr_err("%s: Read failed (mod %d, reg 0x%02x count %d)\n",
@@ -425,7 +428,7 @@ static int twl_read_idcode_register(void)
goto fail;
}
- err = twl_i2c_read(TWL4030_MODULE_INTBR, (u8 *)(&twl_idcode),
+ err = twl_i2c_read(TWL4030_MODULE_INTBR, (u8 *)(&twl_priv->twl_idcode),
REG_IDCODE_7_0, 4);
if (err) {
pr_err("TWL4030: unable to read IDCODE -%d\n", err);
@@ -446,7 +449,7 @@ fail:
*/
int twl_get_type(void)
{
- return TWL_SIL_TYPE(twl_idcode);
+ return TWL_SIL_TYPE(twl_priv->twl_idcode);
}
EXPORT_SYMBOL_GPL(twl_get_type);
@@ -457,7 +460,7 @@ EXPORT_SYMBOL_GPL(twl_get_type);
*/
int twl_get_version(void)
{
- return TWL_SIL_REV(twl_idcode);
+ return TWL_SIL_REV(twl_priv->twl_idcode);
}
EXPORT_SYMBOL_GPL(twl_get_version);
@@ -506,8 +509,8 @@ add_numbered_child(unsigned mod_no, const char *name, int num,
pr_err("%s: invalid module number %d\n", DRIVER_NAME, mod_no);
return ERR_PTR(-EPERM);
}
- sid = twl_map[mod_no].sid;
- twl = &twl_modules[sid];
+ sid = twl_priv->twl_map[mod_no].sid;
+ twl = &twl_priv->twl_modules[sid];
pdev = platform_device_alloc(name, num);
if (!pdev) {
@@ -1143,13 +1146,13 @@ static int twl_remove(struct i2c_client *client)
num_slaves = twl_get_num_slaves();
for (i = 0; i < num_slaves; i++) {
- struct twl_client *twl = &twl_modules[i];
+ struct twl_client *twl = &twl_priv->twl_modules[i];
if (twl->client && twl->client != client)
i2c_unregister_device(twl->client);
- twl_modules[i].client = NULL;
+ twl->client = NULL;
}
- inuse = false;
+ twl_priv->ready = false;
return 0;
}
@@ -1170,7 +1173,7 @@ twl_probe(struct i2c_client *client, const struct i2c_device_id *id)
return -EINVAL;
}
- if (inuse) {
+ if (twl_priv) {
dev_dbg(&client->dev, "only one instance of %s allowed\n",
DRIVER_NAME);
return -EBUSY;
@@ -1194,31 +1197,38 @@ twl_probe(struct i2c_client *client, const struct i2c_device_id *id)
goto free;
}
+ twl_priv = devm_kzalloc(&client->dev, sizeof(struct twl_private),
+ GFP_KERNEL);
+ if (!twl_priv) {
+ status = -ENOMEM;
+ goto free;
+ }
+
if ((id->driver_data) & TWL6030_CLASS) {
- twl_id = TWL6030_CLASS_ID;
- twl_map = &twl6030_map[0];
+ twl_priv->twl_id = TWL6030_CLASS_ID;
+ twl_priv->twl_map = &twl6030_map[0];
/* The charger base address is different in twl6025 */
if ((id->driver_data) & TWL6025_SUBCLASS)
- twl_map[TWL_MODULE_MAIN_CHARGE].base =
+ twl_priv->twl_map[TWL_MODULE_MAIN_CHARGE].base =
TWL6025_BASEADD_CHARGER;
twl_regmap_config = twl6030_regmap_config;
} else {
- twl_id = TWL4030_CLASS_ID;
- twl_map = &twl4030_map[0];
+ twl_priv->twl_id = TWL4030_CLASS_ID;
+ twl_priv->twl_map = &twl4030_map[0];
twl_regmap_config = twl4030_regmap_config;
}
num_slaves = twl_get_num_slaves();
- twl_modules = devm_kzalloc(&client->dev,
- sizeof(struct twl_client) * num_slaves,
- GFP_KERNEL);
- if (!twl_modules) {
+ twl_priv->twl_modules = devm_kzalloc(&client->dev,
+ sizeof(struct twl_client) * num_slaves,
+ GFP_KERNEL);
+ if (!twl_priv->twl_modules) {
status = -ENOMEM;
goto free;
}
for (i = 0; i < num_slaves; i++) {
- struct twl_client *twl = &twl_modules[i];
+ struct twl_client *twl = &twl_priv->twl_modules[i];
if (i == 0) {
twl->client = client;
@@ -1244,13 +1254,13 @@ twl_probe(struct i2c_client *client, const struct i2c_device_id *id)
}
}
- inuse = true;
+ twl_priv->ready = true;
/* setup clock framework */
clocks_init(&pdev->dev, pdata ? pdata->clock : NULL);
/* read TWL IDCODE Register */
- if (twl_id == TWL4030_CLASS_ID) {
+ if (twl_class_is_4030()) {
status = twl_read_idcode_register();
WARN(status < 0, "Error: reading twl_idcode register value\n");
}
--
1.8.1
--
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