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Date: Fri, 20 Nov 2009 11:53:06 -0800
From: Dan Williams <dcbw@...hat.com>
To: Christian Lamparter <chunkeey@...glemail.com>
Cc: linux-wireless@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [RFC] p54: software hot-swap eeprom image
On Fri, 2009-11-20 at 20:27 +0100, Christian Lamparter wrote:
> This (aggregated) patch adds a new sysfs file "eeprom_overwrite"
> which can be used to upload an customized eeprom image to the
> driver during normal operation.
>
> The old wlanX device will quickly vanish. And if the new EEPROM
> image passes all sanity checks the device will reappear.
>
> Hopefully, this proves to be an adequate solution for everyone
> with a bad/missing EEPROM data/chip.
Honestly I wonder if this would be better done with ethtool. There's
already ethtool --eeprom-dump, would it be so hard to do an ethtool
--eeprom-load ?
I can see a number of devices doing this, so in my mind it makes sense
to have a generic facility for this sort of thing. But then again it's
not so common an operation and its fraught with danger :) Libertas
could potentially use this, but libertas has *two* EEPROM images that it
might need to update. So if ethtool did grow --eeprom-load we may want
to account for more than one eeprom image.
What do people think?
Dan
> ---
> there are plenty of bugs left!
>
> would be nice to hear from p54spi & p54pci folks!
>
> Regards,
> Chr
> ---
> diff --git a/drivers/net/wireless/p54/eeprom.c b/drivers/net/wireless/p54/eeprom.c
> index 8e3818f..e5c94d9 100644
> --- a/drivers/net/wireless/p54/eeprom.c
> +++ b/drivers/net/wireless/p54/eeprom.c
> @@ -121,25 +121,20 @@ static int p54_generate_band(struct ieee80211_hw *dev,
> enum ieee80211_band band)
> {
> struct p54_common *priv = dev->priv;
> - struct ieee80211_supported_band *tmp, *old;
> + struct ieee80211_supported_band *old_band, *new_band;
> + struct ieee80211_channel *tmp, *old_chan, *new_chan;
> unsigned int i, j;
> - int ret = -ENOMEM;
> + int old_chan_num, ret = 0;
>
> if ((!list->entries) || (!list->band_channel_num[band]))
> return -EINVAL;
>
> - tmp = kzalloc(sizeof(*tmp), GFP_KERNEL);
> - if (!tmp)
> - goto err_out;
> -
> - tmp->channels = kzalloc(sizeof(struct ieee80211_channel) *
> - list->band_channel_num[band], GFP_KERNEL);
> - if (!tmp->channels)
> - goto err_out;
> -
> - ret = p54_fill_band_bitrates(dev, tmp, band);
> - if (ret)
> - goto err_out;
> + tmp = kzalloc(sizeof(struct ieee80211_channel) *
> + list->band_channel_num[band], GFP_KERNEL);
> + if (!tmp) {
> + ret = -ENOMEM;
> + goto out;
> + }
>
> for (i = 0, j = 0; (j < list->band_channel_num[band]) &&
> (i < list->entries); i++) {
> @@ -161,8 +156,8 @@ static int p54_generate_band(struct ieee80211_hw *dev,
> continue;
> }
>
> - tmp->channels[j].band = list->channels[i].band;
> - tmp->channels[j].center_freq = list->channels[i].freq;
> + tmp[j].band = list->channels[i].band;
> + tmp[j].center_freq = list->channels[i].freq;
> j++;
> }
>
> @@ -172,25 +167,60 @@ static int p54_generate_band(struct ieee80211_hw *dev,
> "2 GHz" : "5 GHz");
>
> ret = -ENODATA;
> - goto err_out;
> + goto out;
> }
>
> - tmp->n_channels = j;
> - old = priv->band_table[band];
> - priv->band_table[band] = tmp;
> - if (old) {
> - kfree(old->channels);
> - kfree(old);
> + old_band = priv->band_table[band];
> + if (old_band) {
> + old_chan_num = old_band->n_channels;
> + old_chan = old_band->channels;
> + old_band->n_channels = 0;
> + old_band->n_bitrates = 0;
> + } else {
> + old_chan_num = 0;
> + old_chan = NULL;
> }
>
> - return 0;
> + if (j < old_chan_num) {
> + printk(KERN_ERR "%s: Channel list can only be extended.\n",
> + wiphy_name(dev->wiphy));
> + goto out;
> + }
> +
> + new_band = krealloc(old_band, sizeof(*new_band), GFP_KERNEL);
> + if (!new_band) {
> + printk(KERN_ERR "%s: Unable to modify band table.\n",
> + wiphy_name(dev->wiphy));
> +
> + goto out;
> + }
> +
> + new_band->band = band;
> + new_band->ht_cap.ht_supported = false;
>
> -err_out:
> - if (tmp) {
> - kfree(tmp->channels);
> - kfree(tmp);
> + new_chan = krealloc(old_chan, j * sizeof(struct ieee80211_channel),
> + GFP_KERNEL);
> +
> + if (!new_chan) {
> + printk(KERN_ERR "%s: Unable to modify band channel table.\n",
> + wiphy_name(dev->wiphy));
> +
> + goto out;
> }
>
> + memcpy(new_chan, tmp, j * sizeof(struct ieee80211_channel));
> +
> + new_band->channels = new_chan;
> + new_band->n_channels = j;
> +
> + ret = p54_fill_band_bitrates(dev, new_band, band);
> + if (ret)
> + goto out;
> +
> + priv->band_table[band] = new_band;
> +
> +out:
> + kfree(tmp);
> return ret;
> }
>
> @@ -533,7 +563,19 @@ static struct p54_cal_database *p54_convert_db(struct pda_custom_wrapper *src,
> return dst;
> }
>
> -int p54_parse_eeprom(struct ieee80211_hw *dev, void *eeprom, int len)
> +static void p54_reset_phydata(struct p54_common *priv)
> +{
> + memset(&priv->rssical_db, 0, sizeof(priv->rssical_db));
> + priv->iq_autocal_len = 0;
> + kfree(priv->output_limit);
> + kfree(priv->curve_data);
> + kfree(priv->iq_autocal);
> + priv->output_limit = NULL;
> + priv->curve_data = NULL;
> + priv->iq_autocal = NULL;
> +}
> +
> +int p54_parse_eeprom(struct ieee80211_hw *dev, const void *eeprom, int len)
> {
> struct p54_common *priv = dev->priv;
> struct eeprom_pda_wrap *wrap;
> @@ -543,10 +585,14 @@ int p54_parse_eeprom(struct ieee80211_hw *dev, void *eeprom, int len)
> int err;
> u8 *end = (u8 *)eeprom + len;
> u16 synth = 0;
> + bool has_rssical = false, has_mac = false, has_country = false;
>
> wrap = (struct eeprom_pda_wrap *) eeprom;
> entry = (void *)wrap->data + le16_to_cpu(wrap->len);
>
> + mutex_lock(&priv->conf_mutex);
> + p54_reset_phydata(priv);
> +
> /* verify that at least the entry length/code fits */
> while ((u8 *)entry <= end - sizeof(*entry)) {
> entry_len = le16_to_cpu(entry->len);
> @@ -558,21 +604,34 @@ int p54_parse_eeprom(struct ieee80211_hw *dev, void *eeprom, int len)
>
> switch (le16_to_cpu(entry->code)) {
> case PDR_MAC_ADDRESS:
> + if (has_mac)
> + break;
> +
> + has_mac = true;
> +
> if (data_len != ETH_ALEN)
> break;
> +
> SET_IEEE80211_PERM_ADDR(dev, entry->data);
> break;
> +
> case PDR_PRISM_PA_CAL_OUTPUT_POWER_LIMITS:
> if (priv->output_limit)
> break;
> +
> err = p54_convert_output_limits(dev, entry->data,
> data_len);
> if (err)
> goto err;
> break;
> +
> case PDR_PRISM_PA_CAL_CURVE_DATA: {
> struct pda_pa_curve_data *curve_data =
> (struct pda_pa_curve_data *)entry->data;
> +
> + if (priv->curve_data)
> + break;
> +
> if (data_len < sizeof(*curve_data)) {
> err = -EINVAL;
> goto err;
> @@ -597,7 +656,11 @@ int p54_parse_eeprom(struct ieee80211_hw *dev, void *eeprom, int len)
> goto err;
> }
> break;
> +
> case PDR_PRISM_ZIF_TX_IQ_CALIBRATION:
> + if (priv->iq_autocal)
> + break;
> +
> priv->iq_autocal = kmalloc(data_len, GFP_KERNEL);
> if (!priv->iq_autocal) {
> err = -ENOMEM;
> @@ -607,11 +670,22 @@ int p54_parse_eeprom(struct ieee80211_hw *dev, void *eeprom, int len)
> memcpy(priv->iq_autocal, entry->data, data_len);
> priv->iq_autocal_len = data_len / sizeof(struct pda_iq_autocal_entry);
> break;
> +
> case PDR_DEFAULT_COUNTRY:
> + if (has_country)
> + break;
> +
> + has_country = true;
> +
> p54_parse_default_country(dev, entry->data, data_len);
> break;
> +
> case PDR_INTERFACE_LIST:
> tmp = entry->data;
> +
> + if (synth)
> + break;
> +
> while ((u8 *)tmp < entry->data + data_len) {
> struct exp_if *exp_if = tmp;
> if (exp_if->if_id == cpu_to_le16(IF_ID_ISL39000))
> @@ -619,22 +693,38 @@ int p54_parse_eeprom(struct ieee80211_hw *dev, void *eeprom, int len)
> tmp += sizeof(*exp_if);
> }
> break;
> +
> case PDR_HARDWARE_PLATFORM_COMPONENT_ID:
> + if (priv->version)
> + break;
> +
> if (data_len < 2)
> break;
> priv->version = *(u8 *)(entry->data + 1);
> break;
> +
> case PDR_RSSI_LINEAR_APPROXIMATION:
> case PDR_RSSI_LINEAR_APPROXIMATION_DUAL_BAND:
> case PDR_RSSI_LINEAR_APPROXIMATION_EXTENDED:
> + if (has_rssical)
> + break;
> +
> + has_rssical = true;
> +
> p54_parse_rssical(dev, entry->data, data_len,
> le16_to_cpu(entry->code));
> break;
> +
> case PDR_RSSI_LINEAR_APPROXIMATION_CUSTOM: {
> __le16 *src = (void *) entry->data;
> s16 *dst = (void *) &priv->rssical_db;
> int i;
>
> + if (has_rssical)
> + break;
> +
> + has_rssical = true;
> +
> if (data_len != sizeof(priv->rssical_db)) {
> err = -EINVAL;
> goto err;
> @@ -644,24 +734,30 @@ int p54_parse_eeprom(struct ieee80211_hw *dev, void *eeprom, int len)
> *(dst++) = (s16) le16_to_cpu(*(src++));
> }
> break;
> +
> case PDR_PRISM_PA_CAL_OUTPUT_POWER_LIMITS_CUSTOM: {
> struct pda_custom_wrapper *pda = (void *) entry->data;
> if (priv->output_limit || data_len < sizeof(*pda))
> break;
> +
> priv->output_limit = p54_convert_db(pda, data_len);
> }
> break;
> +
> case PDR_PRISM_PA_CAL_CURVE_DATA_CUSTOM: {
> struct pda_custom_wrapper *pda = (void *) entry->data;
> if (priv->curve_data || data_len < sizeof(*pda))
> break;
> +
> priv->curve_data = p54_convert_db(pda, data_len);
> }
> break;
> +
> case PDR_END:
> /* make it overrun */
> entry_len = len;
> break;
> +
> default:
> break;
> }
> @@ -670,7 +766,11 @@ int p54_parse_eeprom(struct ieee80211_hw *dev, void *eeprom, int len)
> }
>
> if (!synth || !priv->iq_autocal || !priv->output_limit ||
> - !priv->curve_data) {
> + !priv->curve_data || !has_rssical) {
> + printk(KERN_INFO "%d %p %p %p %d\n",
> + synth, priv->iq_autocal, priv->output_limit,
> + priv->curve_data, has_rssical);
> +
> printk(KERN_ERR "%s: not all required entries found in eeprom!\n",
> wiphy_name(dev->wiphy));
> err = -EINVAL;
> @@ -708,18 +808,18 @@ int p54_parse_eeprom(struct ieee80211_hw *dev, void *eeprom, int len)
> wiphy_name(dev->wiphy), dev->wiphy->perm_addr, priv->version,
> p54_rf_chips[priv->rxhw]);
>
> + mutex_unlock(&priv->conf_mutex);
> +
> return 0;
>
> err:
> - kfree(priv->iq_autocal);
> - kfree(priv->output_limit);
> - kfree(priv->curve_data);
> - priv->iq_autocal = NULL;
> - priv->output_limit = NULL;
> - priv->curve_data = NULL;
> + p54_reset_phydata(priv);
>
> printk(KERN_ERR "%s: eeprom parse failed!\n",
> wiphy_name(dev->wiphy));
> +
> + mutex_unlock(&priv->conf_mutex);
> +
> return err;
> }
> EXPORT_SYMBOL_GPL(p54_parse_eeprom);
> @@ -753,8 +853,39 @@ int p54_read_eeprom(struct ieee80211_hw *dev)
> }
>
> ret = p54_parse_eeprom(dev, eeprom, offset);
> +
> free:
> kfree(eeprom);
> return ret;
> }
> EXPORT_SYMBOL_GPL(p54_read_eeprom);
> +
> +ssize_t p54_overwrite_eeprom(struct ieee80211_hw *dev,
> + const char *buf, size_t len)
> +{
> + struct p54_common *priv = dev->priv;
> + int err;
> +
> + if (len < 64 || len > 0x2020)
> + return -EINVAL;
> +
> + mutex_lock(&priv->sysfs_mutex);
> + p54_unregister_common(dev);
> +
> + err = p54_parse_eeprom(dev, buf, len);
> + if (err)
> + goto out;
> +
> + err = p54_register_common(dev, priv->pdev);
> + if (err)
> + goto out;
> +
> +out:
> +
> + if (err)
> + dev_err(priv->pdev, "failed to (re)-register device.\n");
> +
> + mutex_unlock(&priv->sysfs_mutex);
> + return (err) ? err : len;
> +}
> +EXPORT_SYMBOL_GPL(p54_overwrite_eeprom);
> diff --git a/drivers/net/wireless/p54/main.c b/drivers/net/wireless/p54/main.c
> index 18012db..e1395d4 100644
> --- a/drivers/net/wireless/p54/main.c
> +++ b/drivers/net/wireless/p54/main.c
> @@ -582,6 +582,7 @@ struct ieee80211_hw *p54_init_common(size_t priv_data_len)
> dev->wiphy->flags &= ~WIPHY_FLAG_PS_ON_BY_DEFAULT;
>
> mutex_init(&priv->conf_mutex);
> + mutex_init(&priv->sysfs_mutex);
> mutex_init(&priv->eeprom_mutex);
> init_completion(&priv->eeprom_comp);
> init_completion(&priv->beacon_comp);
> @@ -596,6 +597,9 @@ int p54_register_common(struct ieee80211_hw *dev, struct device *pdev)
> struct p54_common *priv = dev->priv;
> int err;
>
> + if (priv->registered)
> + return -EBUSY;
> +
> err = ieee80211_register_hw(dev);
> if (err) {
> dev_err(pdev, "Cannot register device (%d).\n", err);
> @@ -607,8 +611,9 @@ int p54_register_common(struct ieee80211_hw *dev, struct device *pdev)
> if (err)
> return err;
> #endif /* CONFIG_P54_LEDS */
> -
> + priv->pdev = pdev;
> dev_info(pdev, "is registered as '%s'\n", wiphy_name(dev->wiphy));
> + priv->registered = true;
> return 0;
> }
> EXPORT_SYMBOL_GPL(p54_register_common);
> @@ -618,6 +623,11 @@ void p54_free_common(struct ieee80211_hw *dev)
> struct p54_common *priv = dev->priv;
> unsigned int i;
>
> + BUG_ON(priv->registered);
> +
> + mutex_destroy(&priv->conf_mutex);
> + mutex_destroy(&priv->eeprom_mutex);
> +
> for (i = 0; i < IEEE80211_NUM_BANDS; i++)
> kfree(priv->band_table[i]);
>
> @@ -637,12 +647,14 @@ void p54_unregister_common(struct ieee80211_hw *dev)
> {
> struct p54_common *priv = dev->priv;
>
> + if (!priv->registered)
> + return ;
> +
> #ifdef CONFIG_P54_LEDS
> p54_unregister_leds(priv);
> #endif /* CONFIG_P54_LEDS */
>
> - ieee80211_unregister_hw(dev);
> - mutex_destroy(&priv->conf_mutex);
> - mutex_destroy(&priv->eeprom_mutex);
> + ieee80211_unregister_hw(priv->hw);
> + priv->registered = false;
> }
> EXPORT_SYMBOL_GPL(p54_unregister_common);
> diff --git a/drivers/net/wireless/p54/p54.h b/drivers/net/wireless/p54/p54.h
> index 1afc394..3e097e0 100644
> --- a/drivers/net/wireless/p54/p54.h
> +++ b/drivers/net/wireless/p54/p54.h
> @@ -159,6 +159,7 @@ struct p54_led_dev {
>
> struct p54_common {
> struct ieee80211_hw *hw;
> + struct device *pdev;
> struct ieee80211_vif *vif;
> void (*tx)(struct ieee80211_hw *dev, struct sk_buff *skb);
> int (*open)(struct ieee80211_hw *dev);
> @@ -166,6 +167,7 @@ struct p54_common {
> struct sk_buff_head tx_pending;
> struct sk_buff_head tx_queue;
> struct mutex conf_mutex;
> + bool registered;
>
> /* memory management (as seen by the firmware) */
> u32 rx_start;
> @@ -233,14 +235,17 @@ struct p54_common {
> void *eeprom;
> struct completion eeprom_comp;
> struct mutex eeprom_mutex;
> + struct mutex sysfs_mutex;
> };
>
> /* interfaces for the drivers */
> int p54_rx(struct ieee80211_hw *dev, struct sk_buff *skb);
> void p54_free_skb(struct ieee80211_hw *dev, struct sk_buff *skb);
> int p54_parse_firmware(struct ieee80211_hw *dev, const struct firmware *fw);
> -int p54_parse_eeprom(struct ieee80211_hw *dev, void *eeprom, int len);
> +int p54_parse_eeprom(struct ieee80211_hw *dev, const void *eeprom, int len);
> int p54_read_eeprom(struct ieee80211_hw *dev);
> +ssize_t p54_overwrite_eeprom(struct ieee80211_hw *dev,
> + const char *eeprom, size_t len);
>
> struct ieee80211_hw *p54_init_common(size_t priv_data_len);
> int p54_register_common(struct ieee80211_hw *dev, struct device *pdev);
> diff --git a/drivers/net/wireless/p54/p54pci.c b/drivers/net/wireless/p54/p54pci.c
> index e3a4c90..b8040e4 100644
> --- a/drivers/net/wireless/p54/p54pci.c
> +++ b/drivers/net/wireless/p54/p54pci.c
> @@ -466,6 +466,18 @@ static int p54p_open(struct ieee80211_hw *dev)
> return 0;
> }
>
> +static ssize_t p54p_sysfs_overwrite_eeprom(struct device *dev,
> + struct device_attribute *attr,
> + const char *buf, size_t count)
> +{
> + struct p54p_priv *priv = dev_get_drvdata(dev);
> +
> + return p54_overwrite_eeprom(priv->common.hw, buf, count);
> +}
> +
> +static DEVICE_ATTR(eeprom_overwrite, S_IWUSR,
> + NULL, p54p_sysfs_overwrite_eeprom);
> +
> static int __devinit p54p_probe(struct pci_dev *pdev,
> const struct pci_device_id *id)
> {
> @@ -561,6 +573,13 @@ static int __devinit p54p_probe(struct pci_dev *pdev,
> if (err)
> goto err_free_common;
>
> + err = device_create_file(&pdev->dev, &dev_attr_eeprom_overwrite);
> + if (err < 0) {
> + dev_err(&pdev->dev, "failed to create sysfs file "
> + "eeprom_overwrite.\n");
> + goto err_free_common;
> + }
> +
> return 0;
>
> err_free_common:
> @@ -591,6 +610,8 @@ static void __devexit p54p_remove(struct pci_dev *pdev)
> return;
>
> p54_unregister_common(dev);
> + device_remove_file(&pdev->dev, &dev_attr_eeprom_overwrite);
> +
> priv = dev->priv;
> release_firmware(priv->firmware);
> pci_free_consistent(pdev, sizeof(*priv->ring_control),
> diff --git a/drivers/net/wireless/p54/p54spi.c b/drivers/net/wireless/p54/p54spi.c
> index afd26bf..6fb0863 100644
> --- a/drivers/net/wireless/p54/p54spi.c
> +++ b/drivers/net/wireless/p54/p54spi.c
> @@ -592,6 +592,18 @@ static void p54spi_op_stop(struct ieee80211_hw *dev)
> mutex_unlock(&priv->mutex);
> }
>
> +static ssize_t p54s_sysfs_overwrite_eeprom(struct device *dev,
> + struct device_attribute *attr,
> + const char *buf, size_t count)
> +{
> + struct p54s_priv *priv = dev_get_drvdata(dev);
> +
> + return p54_overwrite_eeprom(priv->common.hw, buf, count);
> +}
> +
> +static DEVICE_ATTR(eeprom_overwrite, S_IWUSR,
> + NULL, p54s_sysfs_overwrite_eeprom);
> +
> static int __devinit p54spi_probe(struct spi_device *spi)
> {
> struct p54s_priv *priv = NULL;
> @@ -667,7 +679,9 @@ static int __devinit p54spi_probe(struct spi_device *spi)
> if (ret)
> goto err_free_common;
>
> - return 0;
> + ret = device_create_file(&spi->dev, &dev_attr_eeprom_overwrite);
> +
> + return ret;
>
> err_free_common:
> p54_free_common(priv->hw);
> @@ -680,6 +694,9 @@ static int __devexit p54spi_remove(struct spi_device *spi)
>
> p54_unregister_common(priv->hw);
>
> + device_remove_file(&spi->dev, &dev_attr_eeprom_overwrite);
> + dev_set_drvdata(&spi->dev, NULL);
> +
> free_irq(gpio_to_irq(p54spi_gpio_irq), spi);
>
> gpio_free(p54spi_gpio_power);
> diff --git a/drivers/net/wireless/p54/p54usb.c b/drivers/net/wireless/p54/p54usb.c
> index 92af9b9..be699d6 100644
> --- a/drivers/net/wireless/p54/p54usb.c
> +++ b/drivers/net/wireless/p54/p54usb.c
> @@ -874,6 +874,19 @@ static void p54u_stop(struct ieee80211_hw *dev)
> return;
> }
>
> +static ssize_t p54u_sysfs_overwrite_eeprom(struct device *dev,
> + struct device_attribute *attr,
> + const char *buf, size_t count)
> +{
> + struct ieee80211_hw *hw = (struct ieee80211_hw *)
> + usb_get_intfdata(to_usb_interface(dev));
> +
> + return p54_overwrite_eeprom(hw, buf, count);
> +}
> +
> +static DEVICE_ATTR(eeprom_overwrite, S_IWUSR,
> + NULL, p54u_sysfs_overwrite_eeprom);
> +
> static int __devinit p54u_probe(struct usb_interface *intf,
> const struct usb_device_id *id)
> {
> @@ -959,7 +972,9 @@ static int __devinit p54u_probe(struct usb_interface *intf,
> if (err)
> goto err_free_fw;
>
> - return 0;
> + err = device_create_file(&intf->dev, &dev_attr_eeprom_overwrite);
> +
> + return err;
>
> err_free_fw:
> release_firmware(priv->fw);
> @@ -982,6 +997,9 @@ static void __devexit p54u_disconnect(struct usb_interface *intf)
> p54_unregister_common(dev);
>
> priv = dev->priv;
> + device_remove_file(&intf->dev, &dev_attr_eeprom_overwrite);
> +
> + usb_set_intfdata(intf, NULL);
> usb_put_dev(interface_to_usbdev(intf));
> release_firmware(priv->fw);
> p54_free_common(dev);
> --
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