Hi Andrew, On 26.02.2016 21:59, Andrew Lunn wrote: > Add a regmap for accessing the EEPROM, and then use that with the > NVMEM framework. Enable backward compatibility in the NVMEM config > structure, so that the 'eeprom' file in sys is provided by the > framework. > > Signed-off-by: Andrew Lunn <and...@lunn.ch> > Acked-by: Srinivas Kandagatla <srinivas.kandaga...@linaro.org> > ---
[snip] > > static ssize_t > -eeprom_93xx46_bin_read(struct file *filp, struct kobject *kobj, > - struct bin_attribute *bin_attr, > - char *buf, loff_t off, size_t count) > +eeprom_93xx46_read(struct eeprom_93xx46_dev *edev, char *buf, > + unsigned off, size_t count) > { > - struct eeprom_93xx46_dev *edev; > - struct device *dev; > ssize_t ret = 0; > > - dev = kobj_to_dev(kobj); > - edev = dev_get_drvdata(dev); > + if (unlikely(off >= edev->size)) > + return 0; > + if ((off + count) > edev->size) > + count = edev->size - off; > + if (unlikely(!count)) > + return count; > I'm scratching my head, do you want to kind of revert the change https://lkml.org/lkml/2015/7/26/89 ? Why? If you know regmap_config.max_register, then all necessary boundary checks can be done inside NVMEM core. > mutex_lock(&edev->lock); > > @@ -226,16 +231,17 @@ eeprom_93xx46_write_word(struct eeprom_93xx46_dev *edev, > } > > static ssize_t > -eeprom_93xx46_bin_write(struct file *filp, struct kobject *kobj, > - struct bin_attribute *bin_attr, > - char *buf, loff_t off, size_t count) > +eeprom_93xx46_write(struct eeprom_93xx46_dev *edev, const char *buf, > + loff_t off, size_t count) > { > - struct eeprom_93xx46_dev *edev; > - struct device *dev; > int i, ret, step = 1; > > - dev = kobj_to_dev(kobj); > - edev = dev_get_drvdata(dev); > + if (unlikely(off >= edev->size)) > + return -EFBIG; > + if ((off + count) > edev->size) > + count = edev->size - off; > + if (unlikely(!count)) > + return count; > See a comment above. > /* only write even number of bytes on 16-bit devices */ > if (edev->addrlen == 6) { > @@ -272,6 +278,49 @@ eeprom_93xx46_bin_write(struct file *filp, struct > kobject *kobj, > return ret ? : count; > } > > +/* > + * Provide a regmap interface, which is registered with the NVMEM > + * framework > +*/ > +static int eeprom_93xx46_regmap_read(void *context, const void *reg, > + size_t reg_size, void *val, > + size_t val_size) > +{ > + struct eeprom_93xx46_dev *eeprom_93xx46 = context; > + off_t offset = *(u32 *)reg; > + int err; > + > + err = eeprom_93xx46_read(eeprom_93xx46, val, offset, val_size); > + if (err) > + return err; > + return 0; return eeprom_93xx46_read(eeprom_93xx46, val, offset, val_size); > +} > + > +static int eeprom_93xx46_regmap_write(void *context, const void *data, > + size_t count) > +{ > + struct eeprom_93xx46_dev *eeprom_93xx46 = context; > + const char *buf; > + u32 offset; > + size_t len; > + int err; > + > + memcpy(&offset, data, sizeof(offset)); > + buf = (const char *)data + sizeof(offset); > + len = count - sizeof(offset); > + > + err = eeprom_93xx46_write(eeprom_93xx46, buf, offset, len); > + if (err) > + return err; > + return 0; return eeprom_93xx46_write(eeprom_93xx46, buf, offset, len); > +} > + -- With best wishes, Vladimir