mfd: Convert WM831x to use regmap API
Factor out the register read/write code to use the register map API. We
still need some wm831x specific code and locking in place to check that
the user key is handled correctly but only on the write side, reads are
not affected by the key.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Samuel Ortiz <sameo@linux.intel.com>
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 21574bd..cfae5c5 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -404,6 +404,7 @@
bool "Support Wolfson Microelectronics WM831x/2x PMICs with I2C"
select MFD_CORE
select MFD_WM831X
+ select REGMAP_I2C
depends on I2C=y && GENERIC_HARDIRQS
help
Support for the Wolfson Microelecronics WM831x and WM832x PMICs
@@ -415,6 +416,7 @@
bool "Support Wolfson Microelectronics WM831x/2x PMICs with SPI"
select MFD_CORE
select MFD_WM831X
+ select REGMAP_SPI
depends on SPI_MASTER && GENERIC_HARDIRQS
help
Support for the Wolfson Microelecronics WM831x and WM832x PMICs
diff --git a/drivers/mfd/wm831x-core.c b/drivers/mfd/wm831x-core.c
index 282e76a..578e0c2 100644
--- a/drivers/mfd/wm831x-core.c
+++ b/drivers/mfd/wm831x-core.c
@@ -18,6 +18,7 @@
#include <linux/delay.h>
#include <linux/mfd/core.h>
#include <linux/slab.h>
+#include <linux/err.h>
#include <linux/mfd/wm831x/core.h>
#include <linux/mfd/wm831x/pdata.h>
@@ -160,29 +161,6 @@
}
EXPORT_SYMBOL_GPL(wm831x_reg_unlock);
-static int wm831x_read(struct wm831x *wm831x, unsigned short reg,
- int bytes, void *dest)
-{
- int ret, i;
- u16 *buf = dest;
-
- BUG_ON(bytes % 2);
- BUG_ON(bytes <= 0);
-
- ret = wm831x->read_dev(wm831x, reg, bytes, dest);
- if (ret < 0)
- return ret;
-
- for (i = 0; i < bytes / 2; i++) {
- buf[i] = be16_to_cpu(buf[i]);
-
- dev_vdbg(wm831x->dev, "Read %04x from R%d(0x%x)\n",
- buf[i], reg + i, reg + i);
- }
-
- return 0;
-}
-
/**
* wm831x_reg_read: Read a single WM831x register.
*
@@ -191,14 +169,10 @@
*/
int wm831x_reg_read(struct wm831x *wm831x, unsigned short reg)
{
- unsigned short val;
+ unsigned int val;
int ret;
- mutex_lock(&wm831x->io_lock);
-
- ret = wm831x_read(wm831x, reg, 2, &val);
-
- mutex_unlock(&wm831x->io_lock);
+ ret = regmap_read(wm831x->regmap, reg, &val);
if (ret < 0)
return ret;
@@ -218,15 +192,7 @@
int wm831x_bulk_read(struct wm831x *wm831x, unsigned short reg,
int count, u16 *buf)
{
- int ret;
-
- mutex_lock(&wm831x->io_lock);
-
- ret = wm831x_read(wm831x, reg, count * 2, buf);
-
- mutex_unlock(&wm831x->io_lock);
-
- return ret;
+ return regmap_bulk_read(wm831x->regmap, reg, buf, count);
}
EXPORT_SYMBOL_GPL(wm831x_bulk_read);
@@ -234,7 +200,7 @@
int bytes, void *src)
{
u16 *buf = src;
- int i;
+ int i, ret;
BUG_ON(bytes % 2);
BUG_ON(bytes <= 0);
@@ -245,11 +211,10 @@
dev_vdbg(wm831x->dev, "Write %04x to R%d(0x%x)\n",
buf[i], reg + i, reg + i);
-
- buf[i] = cpu_to_be16(buf[i]);
+ ret = regmap_write(wm831x->regmap, reg + i, buf[i]);
}
- return wm831x->write_dev(wm831x, reg, bytes, src);
+ return 0;
}
/**
@@ -286,20 +251,14 @@
unsigned short mask, unsigned short val)
{
int ret;
- u16 r;
mutex_lock(&wm831x->io_lock);
- ret = wm831x_read(wm831x, reg, 2, &r);
- if (ret < 0)
- goto out;
+ if (!wm831x_reg_locked(wm831x, reg))
+ ret = regmap_update_bits(wm831x->regmap, reg, mask, val);
+ else
+ ret = -EPERM;
- r &= ~mask;
- r |= val & mask;
-
- ret = wm831x_write(wm831x, reg, 2, &r);
-
-out:
mutex_unlock(&wm831x->io_lock);
return ret;
@@ -1292,6 +1251,12 @@
},
};
+struct regmap_config wm831x_regmap_config = {
+ .reg_bits = 16,
+ .val_bits = 16,
+};
+EXPORT_SYMBOL_GPL(wm831x_regmap_config);
+
/*
* Instantiate the generic non-control parts of the device.
*/
@@ -1309,7 +1274,7 @@
ret = wm831x_reg_read(wm831x, WM831X_PARENT_ID);
if (ret < 0) {
dev_err(wm831x->dev, "Failed to read parent ID: %d\n", ret);
- goto err;
+ goto err_regmap;
}
switch (ret) {
case 0x6204:
@@ -1318,20 +1283,20 @@
default:
dev_err(wm831x->dev, "Device is not a WM831x: ID %x\n", ret);
ret = -EINVAL;
- goto err;
+ goto err_regmap;
}
ret = wm831x_reg_read(wm831x, WM831X_REVISION);
if (ret < 0) {
dev_err(wm831x->dev, "Failed to read revision: %d\n", ret);
- goto err;
+ goto err_regmap;
}
rev = (ret & WM831X_PARENT_REV_MASK) >> WM831X_PARENT_REV_SHIFT;
ret = wm831x_reg_read(wm831x, WM831X_RESET_ID);
if (ret < 0) {
dev_err(wm831x->dev, "Failed to read device ID: %d\n", ret);
- goto err;
+ goto err_regmap;
}
/* Some engineering samples do not have the ID set, rely on
@@ -1406,7 +1371,7 @@
default:
dev_err(wm831x->dev, "Unknown WM831x device %04x\n", ret);
ret = -EINVAL;
- goto err;
+ goto err_regmap;
}
/* This will need revisiting in future but is OK for all
@@ -1420,7 +1385,7 @@
ret = wm831x_reg_read(wm831x, WM831X_SECURITY_KEY);
if (ret < 0) {
dev_err(wm831x->dev, "Failed to read security key: %d\n", ret);
- goto err;
+ goto err_regmap;
}
if (ret != 0) {
dev_warn(wm831x->dev, "Security key had non-zero value %x\n",
@@ -1433,7 +1398,7 @@
ret = pdata->pre_init(wm831x);
if (ret != 0) {
dev_err(wm831x->dev, "pre_init() failed: %d\n", ret);
- goto err;
+ goto err_regmap;
}
}
@@ -1456,7 +1421,7 @@
ret = wm831x_irq_init(wm831x, irq);
if (ret != 0)
- goto err;
+ goto err_regmap;
wm831x_auxadc_init(wm831x);
@@ -1552,8 +1517,9 @@
err_irq:
wm831x_irq_exit(wm831x);
-err:
+err_regmap:
mfd_remove_devices(wm831x->dev);
+ regmap_exit(wm831x->regmap);
kfree(wm831x);
return ret;
}
@@ -1565,6 +1531,7 @@
if (wm831x->irq_base)
free_irq(wm831x->irq_base + WM831X_IRQ_AUXADC_DATA, wm831x);
wm831x_irq_exit(wm831x);
+ regmap_exit(wm831x->regmap);
kfree(wm831x);
}
diff --git a/drivers/mfd/wm831x-i2c.c b/drivers/mfd/wm831x-i2c.c
index a06cbc7..3ec6085 100644
--- a/drivers/mfd/wm831x-i2c.c
+++ b/drivers/mfd/wm831x-i2c.c
@@ -18,67 +18,17 @@
#include <linux/delay.h>
#include <linux/mfd/core.h>
#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/regmap.h>
#include <linux/mfd/wm831x/core.h>
#include <linux/mfd/wm831x/pdata.h>
-static int wm831x_i2c_read_device(struct wm831x *wm831x, unsigned short reg,
- int bytes, void *dest)
-{
- struct i2c_client *i2c = wm831x->control_data;
- int ret;
- u16 r = cpu_to_be16(reg);
-
- ret = i2c_master_send(i2c, (unsigned char *)&r, 2);
- if (ret < 0)
- return ret;
- if (ret != 2)
- return -EIO;
-
- ret = i2c_master_recv(i2c, dest, bytes);
- if (ret < 0)
- return ret;
- if (ret != bytes)
- return -EIO;
- return 0;
-}
-
-/* Currently we allocate the write buffer on the stack; this is OK for
- * small writes - if we need to do large writes this will need to be
- * revised.
- */
-static int wm831x_i2c_write_device(struct wm831x *wm831x, unsigned short reg,
- int bytes, void *src)
-{
- struct i2c_client *i2c = wm831x->control_data;
- struct i2c_msg xfer[2];
- int ret;
-
- reg = cpu_to_be16(reg);
-
- xfer[0].addr = i2c->addr;
- xfer[0].flags = 0;
- xfer[0].len = 2;
- xfer[0].buf = (char *)®
-
- xfer[1].addr = i2c->addr;
- xfer[1].flags = I2C_M_NOSTART;
- xfer[1].len = bytes;
- xfer[1].buf = (char *)src;
-
- ret = i2c_transfer(i2c->adapter, xfer, 2);
- if (ret < 0)
- return ret;
- if (ret != 2)
- return -EIO;
-
- return 0;
-}
-
static int wm831x_i2c_probe(struct i2c_client *i2c,
const struct i2c_device_id *id)
{
struct wm831x *wm831x;
+ int ret;
wm831x = kzalloc(sizeof(struct wm831x), GFP_KERNEL);
if (wm831x == NULL)
@@ -86,9 +36,15 @@
i2c_set_clientdata(i2c, wm831x);
wm831x->dev = &i2c->dev;
- wm831x->control_data = i2c;
- wm831x->read_dev = wm831x_i2c_read_device;
- wm831x->write_dev = wm831x_i2c_write_device;
+
+ wm831x->regmap = regmap_init_i2c(i2c, &wm831x_regmap_config);
+ if (IS_ERR(wm831x->regmap)) {
+ ret = PTR_ERR(wm831x->regmap);
+ dev_err(wm831x->dev, "Failed to allocate register map: %d\n",
+ ret);
+ kfree(wm831x);
+ return ret;
+ }
return wm831x_device_init(wm831x, id->driver_data, i2c->irq);
}
diff --git a/drivers/mfd/wm831x-spi.c b/drivers/mfd/wm831x-spi.c
index eed8e4f..dbe1147 100644
--- a/drivers/mfd/wm831x-spi.c
+++ b/drivers/mfd/wm831x-spi.c
@@ -16,58 +16,16 @@
#include <linux/module.h>
#include <linux/pm.h>
#include <linux/spi/spi.h>
+#include <linux/regmap.h>
+#include <linux/err.h>
#include <linux/mfd/wm831x/core.h>
-static int wm831x_spi_read_device(struct wm831x *wm831x, unsigned short reg,
- int bytes, void *dest)
-{
- u16 tx_val;
- u16 *d = dest;
- int r, ret;
-
- /* Go register at a time */
- for (r = reg; r < reg + (bytes / 2); r++) {
- tx_val = r | 0x8000;
-
- ret = spi_write_then_read(wm831x->control_data,
- (u8 *)&tx_val, 2, (u8 *)d, 2);
- if (ret != 0)
- return ret;
-
- *d = be16_to_cpu(*d);
-
- d++;
- }
-
- return 0;
-}
-
-static int wm831x_spi_write_device(struct wm831x *wm831x, unsigned short reg,
- int bytes, void *src)
-{
- struct spi_device *spi = wm831x->control_data;
- u16 *s = src;
- u16 data[2];
- int ret, r;
-
- /* Go register at a time */
- for (r = reg; r < reg + (bytes / 2); r++) {
- data[0] = r;
- data[1] = *s++;
-
- ret = spi_write(spi, (char *)&data, sizeof(data));
- if (ret != 0)
- return ret;
- }
-
- return 0;
-}
-
static int __devinit wm831x_spi_probe(struct spi_device *spi)
{
struct wm831x *wm831x;
enum wm831x_parent type;
+ int ret;
/* Currently SPI support for ID tables is unmerged, we're faking it */
if (strcmp(spi->modalias, "wm8310") == 0)
@@ -98,9 +56,15 @@
dev_set_drvdata(&spi->dev, wm831x);
wm831x->dev = &spi->dev;
- wm831x->control_data = spi;
- wm831x->read_dev = wm831x_spi_read_device;
- wm831x->write_dev = wm831x_spi_write_device;
+
+ wm831x->regmap = regmap_init_spi(wm831x->dev, &wm831x_regmap_config);
+ if (IS_ERR(wm831x->regmap)) {
+ ret = PTR_ERR(wm831x->regmap);
+ dev_err(wm831x->dev, "Failed to allocate register map: %d\n",
+ ret);
+ kfree(wm831x);
+ return ret;
+ }
return wm831x_device_init(wm831x, type, spi->irq);
}
diff --git a/include/linux/mfd/wm831x/core.h b/include/linux/mfd/wm831x/core.h
index 8dda8de..44acdb2 100644
--- a/include/linux/mfd/wm831x/core.h
+++ b/include/linux/mfd/wm831x/core.h
@@ -18,6 +18,7 @@
#include <linux/completion.h>
#include <linux/interrupt.h>
#include <linux/list.h>
+#include <linux/regmap.h>
/*
* Register values.
@@ -361,12 +362,8 @@
struct mutex io_lock;
struct device *dev;
- int (*read_dev)(struct wm831x *wm831x, unsigned short reg,
- int bytes, void *dest);
- int (*write_dev)(struct wm831x *wm831x, unsigned short reg,
- int bytes, void *src);
- void *control_data;
+ struct regmap *regmap;
int irq; /* Our chip IRQ */
struct mutex irq_lock;
@@ -416,4 +413,6 @@
void wm831x_irq_exit(struct wm831x *wm831x);
void wm831x_auxadc_init(struct wm831x *wm831x);
+extern struct regmap_config wm831x_regmap_config;
+
#endif