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Subject[PATCH v4 2/4] mfd: mc13xxx-core: use regmap for register access
Date
This change converts the mc13xxx core to use regmap rather than direct
spi r/w.
The spidev member of mc13xxx struct becomes redundant and is removed.
Extra debugging aids are added to mc13xxx_reg_rmw.
Mutex init is moved to before regmap init.

Signed-off-by: Marc Reilly <marc@cpdesign.com.au>
---
drivers/mfd/mc13xxx-core.c | 111 +++++++++++++-------------------------------
1 files changed, 33 insertions(+), 78 deletions(-)
diff --git a/drivers/mfd/mc13xxx-core.c b/drivers/mfd/mc13xxx-core.c
index 0753402..2c35d6d 100644
--- a/drivers/mfd/mc13xxx-core.c
+++ b/drivers/mfd/mc13xxx-core.c
@@ -21,6 +21,8 @@
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_gpio.h>
+#include <linux/regmap.h>
+#include <linux/err.h>

enum mc13xxx_id {
MC13XXX_ID_MC13783,
@@ -29,7 +31,7 @@ enum mc13xxx_id {
};

struct mc13xxx {
- struct spi_device *spidev;
+ struct regmap *regmap;

struct device *dev;
enum mc13xxx_id ictype;
@@ -172,67 +174,6 @@ void mc13xxx_unlock(struct mc13xxx *mc13xxx)
}
EXPORT_SYMBOL(mc13xxx_unlock);

-#define MC13XXX_REGOFFSET_SHIFT 25
-static int mc13xxx_spi_reg_read(struct mc13xxx *mc13xxx,
- unsigned int offset, u32 *val)
-{
- struct spi_transfer t;
- struct spi_message m;
- int ret;
-
- *val = offset << MC13XXX_REGOFFSET_SHIFT;
-
- memset(&t, 0, sizeof(t));
-
- t.tx_buf = val;
- t.rx_buf = val;
- t.len = sizeof(u32);
-
- spi_message_init(&m);
- spi_message_add_tail(&t, &m);
-
- ret = spi_sync(mc13xxx->spidev, &m);
-
- /* error in message.status implies error return from spi_sync */
- BUG_ON(!ret && m.status);
-
- if (ret)
- return ret;
-
- *val &= 0xffffff;
-
- return 0;
-}
-
-static int mc13xxx_spi_reg_write(struct mc13xxx *mc13xxx, unsigned int offset,
- u32 val)
-{
- u32 buf;
- struct spi_transfer t;
- struct spi_message m;
- int ret;
-
- buf = 1 << 31 | offset << MC13XXX_REGOFFSET_SHIFT | val;
-
- memset(&t, 0, sizeof(t));
-
- t.tx_buf = &buf;
- t.rx_buf = &buf;
- t.len = sizeof(u32);
-
- spi_message_init(&m);
- spi_message_add_tail(&t, &m);
-
- ret = spi_sync(mc13xxx->spidev, &m);
-
- BUG_ON(!ret && m.status);
-
- if (ret)
- return ret;
-
- return 0;
-}
-
int mc13xxx_reg_read(struct mc13xxx *mc13xxx, unsigned int offset, u32 *val)
{
int ret;
@@ -242,7 +183,7 @@ int mc13xxx_reg_read(struct mc13xxx *mc13xxx, unsigned int offset, u32 *val)
if (offset > MC13XXX_NUMREGS)
return -EINVAL;

- ret = mc13xxx_spi_reg_read(mc13xxx, offset, val);
+ ret = regmap_read(mc13xxx->regmap, offset, val);
dev_vdbg(mc13xxx->dev, "[0x%02x] -> 0x%06x\n", offset, *val);

return ret;
@@ -258,25 +199,19 @@ int mc13xxx_reg_write(struct mc13xxx *mc13xxx, unsigned int offset, u32 val)
if (offset > MC13XXX_NUMREGS || val > 0xffffff)
return -EINVAL;

- return mc13xxx_spi_reg_write(mc13xxx, offset, val);
+ return regmap_write(mc13xxx->regmap, offset, val);
}
EXPORT_SYMBOL(mc13xxx_reg_write);

int mc13xxx_reg_rmw(struct mc13xxx *mc13xxx, unsigned int offset,
u32 mask, u32 val)
{
- int ret;
- u32 valread;
-
+ BUG_ON(!mutex_is_locked(&mc13xxx->lock));
BUG_ON(val & ~mask);
+ dev_vdbg(mc13xxx->dev, "[0x%02x] <- 0x%06x (mask: 0x%06x)\n",
+ offset, val, mask);

- ret = mc13xxx_reg_read(mc13xxx, offset, &valread);
- if (ret)
- return ret;
-
- valread = (valread & ~mask) | val;
-
- return mc13xxx_reg_write(mc13xxx, offset, valread);
+ return regmap_update_bits(mc13xxx->regmap, offset, mask, val);
}
EXPORT_SYMBOL(mc13xxx_reg_rmw);

@@ -752,6 +687,16 @@ static const struct of_device_id mc13xxx_dt_ids[] = {
};
MODULE_DEVICE_TABLE(of, mc13xxx_dt_ids);

+static struct regmap_config mc13xxx_regmap_spi_config = {
+ .reg_bits = 7,
+ .pad_bits = 1,
+ .val_bits = 24,
+
+ .max_register = MC13XXX_NUMREGS,
+
+ .cache_type = REGCACHE_NONE,
+};
+
static int mc13xxx_common_init(struct mc13xxx *mc13xxx,
struct mc13xxx_platform_data *pdata, int irq);

@@ -776,10 +721,19 @@ static int mc13xxx_spi_probe(struct spi_device *spi)
dev_set_drvdata(&spi->dev, mc13xxx);
spi->mode = SPI_MODE_0 | SPI_CS_HIGH;
spi->bits_per_word = 32;
- spi_setup(spi);

mc13xxx->dev = &spi->dev;
- mc13xxx->spidev = spi;
+ mutex_init(&mc13xxx->lock);
+
+ mc13xxx->regmap = regmap_init_spi(spi, &mc13xxx_regmap_spi_config);
+ if (IS_ERR(mc13xxx->regmap)) {
+ ret = PTR_ERR(mc13xxx->regmap);
+ dev_err(mc13xxx->dev, "Failed to initialize register map: %d\n",
+ ret);
+ dev_set_drvdata(&spi->dev, NULL);
+ kfree(mc13xxx);
+ return ret;
+ }

ret = mc13xxx_common_init(mc13xxx, pdata, spi->irq);

@@ -787,7 +741,7 @@ static int mc13xxx_spi_probe(struct spi_device *spi)
dev_set_drvdata(&spi->dev, NULL);
} else {
const struct spi_device_id *devid =
- spi_get_device_id(mc13xxx->spidev);
+ spi_get_device_id(spi);
if (!devid || devid->driver_data != mc13xxx->ictype)
dev_warn(mc13xxx->dev,
"device id doesn't match auto detection!\n");
@@ -801,7 +755,6 @@ static int mc13xxx_common_init(struct mc13xxx *mc13xxx,
{
int ret;

- mutex_init(&mc13xxx->lock);
mc13xxx_lock(mc13xxx);

ret = mc13xxx_identify(mc13xxx);
@@ -878,6 +831,8 @@ static void mc13xxx_common_cleanup(struct mc13xxx *mc13xxx)

mfd_remove_devices(mc13xxx->dev);

+ regmap_exit(mc13xxx->regmap);
+
kfree(mc13xxx);
}

--
1.7.3.4


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