diff options
Diffstat (limited to 'drivers/net/pse-pd/pse_core.c')
| -rw-r--r-- | drivers/net/pse-pd/pse_core.c | 179 |
1 files changed, 179 insertions, 0 deletions
diff --git a/drivers/net/pse-pd/pse_core.c b/drivers/net/pse-pd/pse_core.c index 4610c1f0ddd6..16cc1dc07246 100644 --- a/drivers/net/pse-pd/pse_core.c +++ b/drivers/net/pse-pd/pse_core.c @@ -7,10 +7,14 @@ #include <linux/device.h> #include <linux/ethtool.h> +#include <linux/ethtool_netlink.h> #include <linux/of.h> +#include <linux/phy.h> #include <linux/pse-pd/pse.h> #include <linux/regulator/driver.h> #include <linux/regulator/machine.h> +#include <linux/rtnetlink.h> +#include <net/net_trackers.h> static DEFINE_MUTEX(pse_list_mutex); static LIST_HEAD(pse_controller_list); @@ -210,6 +214,48 @@ out: return ret; } +/** + * pse_control_find_net_by_id - Find net attached to the pse control id + * @pcdev: a pointer to the PSE + * @id: index of the PSE control + * + * Return: pse_control pointer or NULL. The device returned has had a + * reference added and the pointer is safe until the user calls + * pse_control_put() to indicate they have finished with it. + */ +static struct pse_control * +pse_control_find_by_id(struct pse_controller_dev *pcdev, int id) +{ + struct pse_control *psec; + + mutex_lock(&pse_list_mutex); + list_for_each_entry(psec, &pcdev->pse_control_head, list) { + if (psec->id == id) { + kref_get(&psec->refcnt); + mutex_unlock(&pse_list_mutex); + return psec; + } + } + mutex_unlock(&pse_list_mutex); + return NULL; +} + +/** + * pse_control_get_netdev - Return netdev associated to a PSE control + * @psec: PSE control pointer + * + * Return: netdev pointer or NULL + */ +static struct net_device *pse_control_get_netdev(struct pse_control *psec) +{ + ASSERT_RTNL(); + + if (!psec || !psec->attached_phydev) + return NULL; + + return psec->attached_phydev->attached_dev; +} + static int pse_pi_is_enabled(struct regulator_dev *rdev) { struct pse_controller_dev *pcdev = rdev_get_drvdata(rdev); @@ -559,6 +605,139 @@ int devm_pse_controller_register(struct device *dev, } EXPORT_SYMBOL_GPL(devm_pse_controller_register); +struct pse_irq { + struct pse_controller_dev *pcdev; + struct pse_irq_desc desc; + unsigned long *notifs; +}; + +/** + * pse_to_regulator_notifs - Convert PSE notifications to Regulator + * notifications + * @notifs: PSE notifications + * + * Return: Regulator notifications + */ +static unsigned long pse_to_regulator_notifs(unsigned long notifs) +{ + unsigned long rnotifs = 0; + + if (notifs & ETHTOOL_PSE_EVENT_OVER_CURRENT) + rnotifs |= REGULATOR_EVENT_OVER_CURRENT; + if (notifs & ETHTOOL_PSE_EVENT_OVER_TEMP) + rnotifs |= REGULATOR_EVENT_OVER_TEMP; + + return rnotifs; +} + +/** + * pse_isr - IRQ handler for PSE + * @irq: irq number + * @data: pointer to user interrupt structure + * + * Return: irqreturn_t - status of IRQ + */ +static irqreturn_t pse_isr(int irq, void *data) +{ + struct pse_controller_dev *pcdev; + unsigned long notifs_mask = 0; + struct pse_irq_desc *desc; + struct pse_irq *h = data; + int ret, i; + + desc = &h->desc; + pcdev = h->pcdev; + + /* Clear notifs mask */ + memset(h->notifs, 0, pcdev->nr_lines * sizeof(*h->notifs)); + mutex_lock(&pcdev->lock); + ret = desc->map_event(irq, pcdev, h->notifs, ¬ifs_mask); + mutex_unlock(&pcdev->lock); + if (ret || !notifs_mask) + return IRQ_NONE; + + for_each_set_bit(i, ¬ifs_mask, pcdev->nr_lines) { + unsigned long notifs, rnotifs; + struct net_device *netdev; + struct pse_control *psec; + + /* Do nothing PI not described */ + if (!pcdev->pi[i].rdev) + continue; + + notifs = h->notifs[i]; + dev_dbg(h->pcdev->dev, + "Sending PSE notification EVT 0x%lx\n", notifs); + + psec = pse_control_find_by_id(pcdev, i); + rtnl_lock(); + netdev = pse_control_get_netdev(psec); + if (netdev) + ethnl_pse_send_ntf(netdev, notifs); + rtnl_unlock(); + pse_control_put(psec); + + rnotifs = pse_to_regulator_notifs(notifs); + regulator_notifier_call_chain(pcdev->pi[i].rdev, rnotifs, + NULL); + } + + return IRQ_HANDLED; +} + +/** + * devm_pse_irq_helper - Register IRQ based PSE event notifier + * @pcdev: a pointer to the PSE + * @irq: the irq value to be passed to request_irq + * @irq_flags: the flags to be passed to request_irq + * @d: PSE interrupt description + * + * Return: 0 on success and errno on failure + */ +int devm_pse_irq_helper(struct pse_controller_dev *pcdev, int irq, + int irq_flags, const struct pse_irq_desc *d) +{ + struct device *dev = pcdev->dev; + size_t irq_name_len; + struct pse_irq *h; + char *irq_name; + int ret; + + if (!d || !d->map_event || !d->name) + return -EINVAL; + + h = devm_kzalloc(dev, sizeof(*h), GFP_KERNEL); + if (!h) + return -ENOMEM; + + h->pcdev = pcdev; + h->desc = *d; + + /* IRQ name len is pcdev dev name + 5 char + irq desc name + 1 */ + irq_name_len = strlen(dev_name(pcdev->dev)) + 5 + strlen(d->name) + 1; + irq_name = devm_kzalloc(dev, irq_name_len, GFP_KERNEL); + if (!irq_name) + return -ENOMEM; + + snprintf(irq_name, irq_name_len, "pse-%s:%s", dev_name(pcdev->dev), + d->name); + + h->notifs = devm_kcalloc(dev, pcdev->nr_lines, + sizeof(*h->notifs), GFP_KERNEL); + if (!h->notifs) + return -ENOMEM; + + ret = devm_request_threaded_irq(dev, irq, NULL, pse_isr, + IRQF_ONESHOT | irq_flags, + irq_name, h); + if (ret) + dev_err(pcdev->dev, "Failed to request IRQ %d\n", irq); + + pcdev->irq = irq; + return ret; +} +EXPORT_SYMBOL_GPL(devm_pse_irq_helper); + /* PSE control section */ static void __pse_control_release(struct kref *kref) |