misc: keba: Add battery device

Add support for the battery auxiliary device. This enables monitoring of
the battery.

Signed-off-by: Gerhard Engleder <eg@keba.com>
Link: https://lore.kernel.org/r/20241011191257.19702-8-gerhard@engleder-embedded.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/misc/keba/cp500.c b/drivers/misc/keba/cp500.c
index ae3ed1cece3227833a658a04be41fed11158c114..afd4d7c06ceec79386f2e2897dde8289556cba1d 100644 (file)
--- a/drivers/misc/keba/cp500.c
+++ b/drivers/misc/keba/cp500.c
@@ -82,6 +82,7 @@ struct cp500_devs {
        struct cp500_dev_info spi;
        struct cp500_dev_info i2c;
        struct cp500_dev_info fan;
+       struct cp500_dev_info batt;
 };
 
 /* list of devices within FPGA of CP035 family (CP035, CP056, CP057) */
@@ -90,6 +91,7 @@ static struct cp500_devs cp035_devices = {
        .spi       = { 0x1000, SZ_4K },
        .i2c       = { 0x4000, SZ_4K },
        .fan       = { 0x9000, SZ_4K },
+       .batt      = { 0xA000, SZ_4K },
 };
 
 /* list of devices within FPGA of CP505 family (CP503, CP505, CP507) */
@@ -98,6 +100,7 @@ static struct cp500_devs cp505_devices = {
        .spi       = { 0x4000, SZ_4K },
        .i2c       = { 0x5000, SZ_4K },
        .fan       = { 0x9000, SZ_4K },
+       .batt      = { 0xA000, SZ_4K },
 };
 
 /* list of devices within FPGA of CP520 family (CP520, CP530) */
@@ -106,6 +109,7 @@ static struct cp500_devs cp520_devices = {
        .spi       = { 0x4000, SZ_4K },
        .i2c       = { 0x5000, SZ_4K },
        .fan       = { 0x8000, SZ_4K },
+       .batt      = { 0x9000, SZ_4K },
 };
 
 struct cp500_nvmem {
@@ -130,6 +134,7 @@ struct cp500 {
        struct keba_spi_auxdev *spi;
        struct keba_i2c_auxdev *i2c;
        struct keba_fan_auxdev *fan;
+       struct keba_batt_auxdev *batt;
 
        /* ECM EtherCAT BAR */
        resource_size_t ecm_hwbase;
@@ -457,6 +462,54 @@ static int cp500_register_fan(struct cp500 *cp500)
        return 0;
 }
 
+static void cp500_batt_release(struct device *dev)
+{
+       struct keba_batt_auxdev *fan =
+               container_of(dev, struct keba_batt_auxdev, auxdev.dev);
+
+       kfree(fan);
+}
+
+static int cp500_register_batt(struct cp500 *cp500)
+{
+       int ret;
+
+       cp500->batt = kzalloc(sizeof(*cp500->batt), GFP_KERNEL);
+       if (!cp500->batt)
+               return -ENOMEM;
+
+       cp500->batt->auxdev.name = "batt";
+       cp500->batt->auxdev.id = 0;
+       cp500->batt->auxdev.dev.release = cp500_batt_release;
+       cp500->batt->auxdev.dev.parent = &cp500->pci_dev->dev;
+       cp500->batt->io = (struct resource) {
+                /* battery register area */
+                .start = (resource_size_t) cp500->sys_hwbase +
+                         cp500->devs->batt.offset,
+                .end   = (resource_size_t) cp500->sys_hwbase +
+                         cp500->devs->batt.offset +
+                         cp500->devs->batt.size - 1,
+                .flags = IORESOURCE_MEM,
+       };
+
+       ret = auxiliary_device_init(&cp500->batt->auxdev);
+       if (ret) {
+               kfree(cp500->batt);
+               cp500->batt = NULL;
+
+               return ret;
+       }
+       ret = __auxiliary_device_add(&cp500->batt->auxdev, "keba");
+       if (ret) {
+               auxiliary_device_uninit(&cp500->batt->auxdev);
+               cp500->batt = NULL;
+
+               return ret;
+       }
+
+       return 0;
+}
+
 static int cp500_nvmem_read(void *priv, unsigned int offset, void *val,
                            size_t bytes)
 {
@@ -613,6 +666,8 @@ static void cp500_register_auxiliary_devs(struct cp500 *cp500)
        if (present & CP500_PRESENT_FAN0)
                if (cp500_register_fan(cp500))
                        dev_warn(dev, "Failed to register fan!\n");
+       if (cp500_register_batt(cp500))
+               dev_warn(dev, "Failed to register battery!\n");
 }
 
 static void cp500_unregister_dev(struct auxiliary_device *auxdev)
@@ -635,6 +690,10 @@ static void cp500_unregister_auxiliary_devs(struct cp500 *cp500)
                cp500_unregister_dev(&cp500->fan->auxdev);
                cp500->fan = NULL;
        }
+       if (cp500->batt) {
+               cp500_unregister_dev(&cp500->batt->auxdev);
+               cp500->batt = NULL;
+       }
 }
 
 static irqreturn_t cp500_axi_handler(int irq, void *dev)

diff --git a/include/linux/misc/keba.h b/include/linux/misc/keba.h
index 451777acc2627aabac17f4127e5ae2e183a22a00..ca52716f84372d55eb88087c95e36bc5d7f37f7e 100644 (file)
--- a/include/linux/misc/keba.h
+++ b/include/linux/misc/keba.h
@@ -47,4 +47,14 @@ struct keba_fan_auxdev {
        struct resource io;
 };
 
+/**
+ * struct keba_batt_auxdev - KEBA battery auxiliary device
+ * @auxdev: auxiliary device object
+ * @io: address range of battery controller IO memory
+ */
+struct keba_batt_auxdev {
+       struct auxiliary_device auxdev;
+       struct resource io;
+};
+
 #endif /* _LINUX_MISC_KEBA_H */