diff options
Diffstat (limited to 'drivers/platform/mellanox/mlxreg-io.c')
| -rw-r--r-- | drivers/platform/mellanox/mlxreg-io.c | 73 |
1 files changed, 57 insertions, 16 deletions
diff --git a/drivers/platform/mellanox/mlxreg-io.c b/drivers/platform/mellanox/mlxreg-io.c index acfaf64ffde6..97fefe6c38d1 100644 --- a/drivers/platform/mellanox/mlxreg-io.c +++ b/drivers/platform/mellanox/mlxreg-io.c @@ -11,14 +11,13 @@ #include <linux/hwmon.h> #include <linux/hwmon-sysfs.h> #include <linux/module.h> -#include <linux/of_device.h> #include <linux/platform_data/mlxreg.h> #include <linux/platform_device.h> #include <linux/regmap.h> /* Attribute parameters. */ #define MLXREG_IO_ATT_SIZE 10 -#define MLXREG_IO_ATT_NUM 48 +#define MLXREG_IO_ATT_NUM 96 /** * struct mlxreg_io_priv_data - driver's private data: @@ -30,6 +29,8 @@ * @mlxreg_io_dev_attr: sysfs sensor device attribute array; * @group: sysfs attribute group; * @groups: list of sysfs attribute group for hwmon registration; + * @regsize: size of a register value; + * @io_lock: user access locking; */ struct mlxreg_io_priv_data { struct platform_device *pdev; @@ -39,27 +40,31 @@ struct mlxreg_io_priv_data { struct sensor_device_attribute mlxreg_io_dev_attr[MLXREG_IO_ATT_NUM]; struct attribute_group group; const struct attribute_group *groups[2]; + int regsize; + struct mutex io_lock; /* Protects user access. */ }; static int mlxreg_io_get_reg(void *regmap, struct mlxreg_core_data *data, u32 in_val, - bool rw_flag, u32 *regval) + bool rw_flag, int regsize, u32 *regval) { - int ret; + int i, val, ret; ret = regmap_read(regmap, data->reg, regval); if (ret) goto access_error; /* - * There are three kinds of attributes: single bit, full register's - * bits and bit sequence. For the first kind field mask indicates which - * bits are not related and field bit is set zero. For the second kind - * field mask is set to zero and field bit is set with all bits one. - * No special handling for such kind of attributes - pass value as is. - * For the third kind, field mask indicates which bits are related and - * field bit is set to the first bit number (from 1 to 32) is the bit - * sequence. + * There are four kinds of attributes: single bit, full register's + * bits, bit sequence, bits in few registers For the first kind field + * mask indicates which bits are not related and field bit is set zero. + * For the second kind field mask is set to zero and field bit is set + * with all bits one. No special handling for such kind of attributes - + * pass value as is. For the third kind, the field mask indicates which + * bits are related and the field bit is set to the first bit number + * (from 1 to 32) is the bit sequence. For the fourth kind - the number + * of registers which should be read for getting an attribute are + * specified through 'data->regnum' field. */ if (!data->bit) { /* Single bit. */ @@ -83,6 +88,19 @@ mlxreg_io_get_reg(void *regmap, struct mlxreg_core_data *data, u32 in_val, /* Clear relevant bits and set them to new value. */ *regval = (*regval & ~data->mask) | in_val; } + } else { + /* + * Some attributes could occupied few registers in case regmap + * bit size is 8 or 16. Compose such attributes from 'regnum' + * registers. Such attributes contain read-only data. + */ + for (i = 1; i < data->regnum; i++) { + ret = regmap_read(regmap, data->reg + i, &val); + if (ret) + goto access_error; + + *regval |= rol32(val, regsize * i * 8); + } } access_error: @@ -99,13 +117,19 @@ mlxreg_io_attr_show(struct device *dev, struct device_attribute *attr, u32 regval = 0; int ret; - ret = mlxreg_io_get_reg(priv->pdata->regmap, data, 0, true, ®val); + mutex_lock(&priv->io_lock); + + ret = mlxreg_io_get_reg(priv->pdata->regmap, data, 0, true, + priv->regsize, ®val); if (ret) goto access_error; - return sprintf(buf, "%u\n", regval); + mutex_unlock(&priv->io_lock); + + return sysfs_emit(buf, "%u\n", regval); access_error: + mutex_unlock(&priv->io_lock); return ret; } @@ -123,12 +147,14 @@ mlxreg_io_attr_store(struct device *dev, struct device_attribute *attr, return -EINVAL; /* Convert buffer to input value. */ - ret = kstrtou32(buf, len, &input_val); + ret = kstrtou32(buf, 0, &input_val); if (ret) return ret; + mutex_lock(&priv->io_lock); + ret = mlxreg_io_get_reg(priv->pdata->regmap, data, input_val, false, - ®val); + priv->regsize, ®val); if (ret) goto access_error; @@ -136,9 +162,12 @@ mlxreg_io_attr_store(struct device *dev, struct device_attribute *attr, if (ret) goto access_error; + mutex_unlock(&priv->io_lock); + return len; access_error: + mutex_unlock(&priv->io_lock); dev_err(&priv->pdev->dev, "Bus access error\n"); return ret; } @@ -207,6 +236,9 @@ static int mlxreg_io_probe(struct platform_device *pdev) } priv->pdev = pdev; + priv->regsize = regmap_get_val_bytes(priv->pdata->regmap); + if (priv->regsize < 0) + return priv->regsize; err = mlxreg_io_attr_init(priv); if (err) { @@ -225,16 +257,25 @@ static int mlxreg_io_probe(struct platform_device *pdev) return PTR_ERR(priv->hwmon); } + mutex_init(&priv->io_lock); dev_set_drvdata(&pdev->dev, priv); return 0; } +static void mlxreg_io_remove(struct platform_device *pdev) +{ + struct mlxreg_io_priv_data *priv = dev_get_drvdata(&pdev->dev); + + mutex_destroy(&priv->io_lock); +} + static struct platform_driver mlxreg_io_driver = { .driver = { .name = "mlxreg-io", }, .probe = mlxreg_io_probe, + .remove = mlxreg_io_remove, }; module_platform_driver(mlxreg_io_driver); |