Add basic MMIO support to AppleSMC for T2 Macs,
enabling it only when supported.
This replaces the legacy port-based method for
key reading, writing, and metadata operations
(retrieving keys by index and obtaining key information)
Signed-off-by: Subu Dwevedi <messigoatcr7nop@gmail.com>
---
drivers/hwmon/applesmc.c | 223 +++++++++++++++++++++++++++++++++++++--
1 file changed, 213 insertions(+), 10 deletions(-)
diff --git a/drivers/hwmon/applesmc.c b/drivers/hwmon/applesmc.c
index fc6d6a9053ce..1be4a4026a6e 100644
--- a/drivers/hwmon/applesmc.c
+++ b/drivers/hwmon/applesmc.c
@@ -17,6 +17,7 @@
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <linux/acpi.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/input.h>
@@ -142,7 +143,9 @@ static struct platform_device *pdev;
static s16 rest_x;
static s16 rest_y;
static u8 backlight_state[2];
-
+static u8 *__iomem mmio_base;
+static bool is_mmio;
+static u32 mmio_base_addr, mmio_base_size;
static struct device *hwmon_dev;
static struct input_dev *applesmc_idev;
@@ -245,7 +248,108 @@ static int send_argument(const char *key)
return 0;
}
-static int read_smc(u8 cmd, const char *key, u8 *buffer, u8 len)
+/*
+ * MMIO Impliementation
+ */
+
+static void clearArbitration(void)
+{
+ if (ioread8(mmio_base + 0x4005))
+ return iowrite8(0, mmio_base + 0x4005);
+}
+static int waitForKeyDone(void)
+{
+ int i = 1000; //millisecounds
+ u8 status;
+
+ while (i) {
+ msleep(1);
+ i--;
+
+ status = ioread8(mmio_base + 0x4005);
+ if (status & 0x20)
+ return 0;
+ }
+
+ return -EIO;
+}
+static int mmio_read_smc(u8 cmd, const char *key, u8 *buffer, u64 len)
+{
+ u8 i, u = 0;
+
+ clearArbitration();
+ iowrite32(*((u32 *)key), mmio_base + 0x78);
+ iowrite8(0x15, mmio_base + 0x7E);
+ iowrite8(cmd, mmio_base + 0x7F);
+
+ if (waitForKeyDone())
+ return -EIO;
+
+ i = ioread8(mmio_base + 0x7F);
+ if (i)
+ return -EIO;
+ if (cmd == APPLESMC_READ_CMD) {
+ i = ioread8(mmio_base + 0x7D);
+ if (i > len || !i)
+ return -EIO;
+
+ while (u < i) {
+ if ((i - u) < 4) {
+ if ((i - u) < 2) {
+ buffer[u] = ioread8(mmio_base + u);
+ u += 1;
+ } else {
+ *(u16 *)&buffer[u] = ioread16(mmio_base + u);
+ u += 2;
+ }
+ } else {
+ *(u32 *)&buffer[u] = ioread32(mmio_base + u);
+ u += 4;
+ }
+ }
+ } else
+ memcpy_fromio(buffer, mmio_base + 0x0, len);
+
+ return 0;
+}
+static int mmio_write_smc(u8 cmd, const char *key, const u8 *buffer, u8 len)
+{
+ u8 i = 0;
+
+ clearArbitration();
+ iowrite32(*((u32 *)key), mmio_base + 0x78);
+ while (i < len) {
+ if (len - i < 4) {
+ if (len - i < 2) {
+ iowrite8(buffer[i], mmio_base + i);
+ i += 1;
+ } else {
+ iowrite16(*(u16 *)&buffer[i], mmio_base + i);
+ i += 2;
+ }
+ } else {
+ iowrite32(*(u32 *)&buffer[i], mmio_base + i);
+ i += 4;
+ }
+ }
+ iowrite8(len, mmio_base + 0x7D);
+ iowrite8(0x15, mmio_base + 0x7E);
+ iowrite8(cmd, mmio_base + 0x7F);
+ if (waitForKeyDone())
+ return -EIO;
+
+ i = ioread8(mmio_base + 0x7F);
+ if (i)
+ return -EIO;
+
+ return 0;
+}
+
+/*
+ * Port Based IO implementation
+ *
+ */
+static int port_read_smc(u8 cmd, const char *key, u8 *buffer, u8 len)
{
u8 status, data = 0;
int i;
@@ -289,7 +393,7 @@ static int read_smc(u8 cmd, const char *key, u8 *buffer, u8 len)
return wait_status(0, SMC_STATUS_BUSY);
}
-static int write_smc(u8 cmd, const char *key, const u8 *buffer, u8 len)
+static int port_write_smc(u8 cmd, const char *key, const u8 *buffer, u8 len)
{
int i;
int ret;
@@ -317,7 +421,23 @@ static int write_smc(u8 cmd, const char *key, const u8 *buffer, u8 len)
return wait_status(0, SMC_STATUS_BUSY);
}
+static int write_smc(u8 cmd, const char *key, const u8 *buffer,
+ u8 len)
+{
+ if (is_mmio)
+ return mmio_write_smc(cmd, key, buffer, len);
+
+ return port_write_smc(cmd, key, buffer, len);
+}
+static int read_smc(u8 cmd, const char *key, u8 *buffer, u8 len)
+{
+ if (is_mmio)
+ return mmio_read_smc(cmd, key, buffer, len);
+
+
+ return port_read_smc(cmd, key, buffer, len);
+}
static int read_register_count(unsigned int *count)
{
__be32 be;
@@ -379,18 +499,39 @@ static const struct applesmc_entry *applesmc_get_entry_by_index(int index)
if (cache->valid)
goto out;
+
be = cpu_to_be32(index);
- ret = read_smc(APPLESMC_GET_KEY_BY_INDEX_CMD, (u8 *)&be, key, 4);
- if (ret)
- goto out;
- ret = read_smc(APPLESMC_GET_KEY_TYPE_CMD, key, info, 6);
+ ret = read_smc(APPLESMC_GET_KEY_BY_INDEX_CMD, (const char *) &be, (u8 *) key, 4);
if (ret)
goto out;
+ if (is_mmio) {
+ clearArbitration();
+ iowrite32(*((u32 *)key), mmio_base + 0x78);
+ iowrite8(0, mmio_base + 0x7E);
+ iowrite8(APPLESMC_GET_KEY_TYPE_CMD, mmio_base + 0x7F);
+ ret = waitForKeyDone();
+ if (ret)
+ goto out;
+
+ ret = ioread8(mmio_base + 0x7F);
+ if (ret)
+ goto out;
+
+ *(u32 *)cache->type = ioread32(mmio_base + 0x7F);
+ cache->len = ioread8(mmio_base + 5);
+ cache->flags = ioread8(mmio_base + 6);
+
+ } else {
+ ret = read_smc(APPLESMC_GET_KEY_TYPE_CMD, key, info, 6);
+ if (ret)
+ goto out;
+
+ cache->len = info[0];
+ memcpy(cache->type, &info[1], 4);
+ cache->flags = info[5];
+ }
memcpy(cache->key, key, 4);
- cache->len = info[0];
- memcpy(cache->type, &info[1], 4);
- cache->flags = info[5];
cache->valid = true;
out:
@@ -558,7 +699,64 @@ static int applesmc_init_index(struct applesmc_registers *s)
return 0;
}
+/*
+ * applesmc_init_mmio_try - Try to initialize MMIO
+ */
+static int applesmc_init_mmio_try(void)
+{
+ u8 ldkn_version;
+ acpi_status status;
+ struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
+ struct acpi_device *adev;
+ struct acpi_resource *res;
+
+ adev = acpi_dev_get_first_match_dev("APP0001", NULL, -1);
+ if (!adev)
+ return -ENXIO;
+
+ status = acpi_get_current_resources(adev->handle, &buffer);
+ if (ACPI_FAILURE(status))
+ return -ENXIO;
+
+ res = buffer.pointer;
+ while (res->type != ACPI_RESOURCE_TYPE_END_TAG) {
+ if (res->type == ACPI_RESOURCE_TYPE_FIXED_MEMORY32) {
+ if (res->data.fixed_memory32.address_length < 0x4006)
+ return -ENXIO;
+
+ mmio_base_addr = res->data.fixed_memory32.address;
+ mmio_base_size = res->data.fixed_memory32.address_length;
+ is_mmio = true;
+ break;
+ }
+ res = ACPI_NEXT_RESOURCE(res);
+ }
+ kfree(buffer.pointer);
+ acpi_dev_put(adev);
+
+ if (!is_mmio)
+ return -ENXIO;
+
+ mmio_base = ioremap(mmio_base_addr, mmio_base_size);
+
+ if (!mmio_base)
+ return -ENXIO;
+ if (ioread8(mmio_base + 0x4005) == 0xFF)
+ goto out;
+
+ if (read_smc(APPLESMC_READ_CMD, "LDKN", &ldkn_version, 1))
+ goto out;
+
+ if (ldkn_version < 2)
+ goto out;
+
+ return 0;
+out:
+ pr_warn("cannot enable MMIO will use PMIO\n");
+ iounmap(mmio_base);
+ return -ENXIO;
+}
/*
* applesmc_init_smcreg_try - Try to initialize register cache. Idempotent.
*/
@@ -1321,6 +1519,8 @@ static int __init applesmc_init(void)
ret = -ENXIO;
goto out;
}
+ if (applesmc_init_mmio_try())
+ is_mmio = false;
ret = platform_driver_register(&applesmc_driver);
if (ret)
@@ -1407,6 +1607,9 @@ static void __exit applesmc_exit(void)
applesmc_destroy_smcreg();
platform_device_unregister(pdev);
platform_driver_unregister(&applesmc_driver);
+ if (is_mmio)
+ iounmap(mmio_base);
+
release_region(APPLESMC_DATA_PORT, APPLESMC_NR_PORTS);
}
--
2.43.0On Wed, Mar 12, 2025 at 06:00:22PM +0530, Subu Dwevedi wrote: > Add basic MMIO support to AppleSMC for T2 Macs, > enabling it only when supported. > This replaces the legacy port-based method for > key reading, writing, and metadata operations > (retrieving keys by index and obtaining key information) > > Signed-off-by: Subu Dwevedi <messigoatcr7nop@gmail.com> I expect the errors reported by the kernel test robot to be fixed before I have a closer look at the patches. Guenter
Hi Subu,
kernel test robot noticed the following build warnings:
[auto build test WARNING on groeck-staging/hwmon-next]
[also build test WARNING on linus/master v6.14-rc6 next-20250313]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]
url: https://github.com/intel-lab-lkp/linux/commits/Subu-Dwevedi/hwmon-applesmc-add-MMIO-for-newer-macs/20250312-203248
base: https://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging.git hwmon-next
patch link: https://lore.kernel.org/r/20250312123055.1735-2-messigoatcr7nop%40gmail.com
patch subject: [PATCH 1/2] hwmon/applesmc: add MMIO for newer macs
config: x86_64-randconfig-122-20250313 (https://download.01.org/0day-ci/archive/20250314/202503141052.v7b9psFM-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250314/202503141052.v7b9psFM-lkp@intel.com/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202503141052.v7b9psFM-lkp@intel.com/
sparse warnings: (new ones prefixed by >>)
>> drivers/hwmon/applesmc.c:257:31: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void const [noderef] __iomem * @@ got unsigned char [usertype] * @@
drivers/hwmon/applesmc.c:257:31: sparse: expected void const [noderef] __iomem *
drivers/hwmon/applesmc.c:257:31: sparse: got unsigned char [usertype] *
>> drivers/hwmon/applesmc.c:258:46: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void [noderef] __iomem * @@ got unsigned char [usertype] * @@
drivers/hwmon/applesmc.c:258:46: sparse: expected void [noderef] __iomem *
drivers/hwmon/applesmc.c:258:46: sparse: got unsigned char [usertype] *
drivers/hwmon/applesmc.c:269:44: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void const [noderef] __iomem * @@ got unsigned char [usertype] * @@
drivers/hwmon/applesmc.c:269:44: sparse: expected void const [noderef] __iomem *
drivers/hwmon/applesmc.c:269:44: sparse: got unsigned char [usertype] *
drivers/hwmon/applesmc.c:281:44: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void [noderef] __iomem * @@ got unsigned char [usertype] * @@
drivers/hwmon/applesmc.c:281:44: sparse: expected void [noderef] __iomem *
drivers/hwmon/applesmc.c:281:44: sparse: got unsigned char [usertype] *
drivers/hwmon/applesmc.c:282:34: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void [noderef] __iomem * @@ got unsigned char [usertype] * @@
drivers/hwmon/applesmc.c:282:34: sparse: expected void [noderef] __iomem *
drivers/hwmon/applesmc.c:282:34: sparse: got unsigned char [usertype] *
drivers/hwmon/applesmc.c:283:33: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void [noderef] __iomem * @@ got unsigned char [usertype] * @@
drivers/hwmon/applesmc.c:283:33: sparse: expected void [noderef] __iomem *
drivers/hwmon/applesmc.c:283:33: sparse: got unsigned char [usertype] *
drivers/hwmon/applesmc.c:288:31: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void const [noderef] __iomem * @@ got unsigned char [usertype] * @@
drivers/hwmon/applesmc.c:288:31: sparse: expected void const [noderef] __iomem *
drivers/hwmon/applesmc.c:288:31: sparse: got unsigned char [usertype] *
drivers/hwmon/applesmc.c:292:39: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void const [noderef] __iomem * @@ got unsigned char [usertype] * @@
drivers/hwmon/applesmc.c:292:39: sparse: expected void const [noderef] __iomem *
drivers/hwmon/applesmc.c:292:39: sparse: got unsigned char [usertype] *
drivers/hwmon/applesmc.c:299:71: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void const [noderef] __iomem * @@ got unsigned char [usertype] * @@
drivers/hwmon/applesmc.c:299:71: sparse: expected void const [noderef] __iomem *
drivers/hwmon/applesmc.c:299:71: sparse: got unsigned char [usertype] *
drivers/hwmon/applesmc.c:302:81: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void const [noderef] __iomem * @@ got unsigned char [usertype] * @@
drivers/hwmon/applesmc.c:302:81: sparse: expected void const [noderef] __iomem *
drivers/hwmon/applesmc.c:302:81: sparse: got unsigned char [usertype] *
drivers/hwmon/applesmc.c:306:73: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void const [noderef] __iomem * @@ got unsigned char [usertype] * @@
drivers/hwmon/applesmc.c:306:73: sparse: expected void const [noderef] __iomem *
drivers/hwmon/applesmc.c:306:73: sparse: got unsigned char [usertype] *
>> drivers/hwmon/applesmc.c:311:49: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void const volatile [noderef] __iomem * @@ got unsigned char [usertype] * @@
drivers/hwmon/applesmc.c:311:49: sparse: expected void const volatile [noderef] __iomem *
drivers/hwmon/applesmc.c:311:49: sparse: got unsigned char [usertype] *
drivers/hwmon/applesmc.c:320:44: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void [noderef] __iomem * @@ got unsigned char [usertype] * @@
drivers/hwmon/applesmc.c:320:44: sparse: expected void [noderef] __iomem *
drivers/hwmon/applesmc.c:320:44: sparse: got unsigned char [usertype] *
drivers/hwmon/applesmc.c:324:63: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void [noderef] __iomem * @@ got unsigned char [usertype] * @@
drivers/hwmon/applesmc.c:324:63: sparse: expected void [noderef] __iomem *
drivers/hwmon/applesmc.c:324:63: sparse: got unsigned char [usertype] *
drivers/hwmon/applesmc.c:327:73: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void [noderef] __iomem * @@ got unsigned char [usertype] * @@
drivers/hwmon/applesmc.c:327:73: sparse: expected void [noderef] __iomem *
drivers/hwmon/applesmc.c:327:73: sparse: got unsigned char [usertype] *
drivers/hwmon/applesmc.c:331:65: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void [noderef] __iomem * @@ got unsigned char [usertype] * @@
drivers/hwmon/applesmc.c:331:65: sparse: expected void [noderef] __iomem *
drivers/hwmon/applesmc.c:331:65: sparse: got unsigned char [usertype] *
drivers/hwmon/applesmc.c:335:33: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void [noderef] __iomem * @@ got unsigned char [usertype] * @@
drivers/hwmon/applesmc.c:335:33: sparse: expected void [noderef] __iomem *
drivers/hwmon/applesmc.c:335:33: sparse: got unsigned char [usertype] *
drivers/hwmon/applesmc.c:336:34: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void [noderef] __iomem * @@ got unsigned char [usertype] * @@
drivers/hwmon/applesmc.c:336:34: sparse: expected void [noderef] __iomem *
drivers/hwmon/applesmc.c:336:34: sparse: got unsigned char [usertype] *
drivers/hwmon/applesmc.c:337:33: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void [noderef] __iomem * @@ got unsigned char [usertype] * @@
drivers/hwmon/applesmc.c:337:33: sparse: expected void [noderef] __iomem *
drivers/hwmon/applesmc.c:337:33: sparse: got unsigned char [usertype] *
drivers/hwmon/applesmc.c:341:31: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void const [noderef] __iomem * @@ got unsigned char [usertype] * @@
drivers/hwmon/applesmc.c:341:31: sparse: expected void const [noderef] __iomem *
drivers/hwmon/applesmc.c:341:31: sparse: got unsigned char [usertype] *
drivers/hwmon/applesmc.c:510:52: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void [noderef] __iomem * @@ got unsigned char [usertype] * @@
drivers/hwmon/applesmc.c:510:52: sparse: expected void [noderef] __iomem *
drivers/hwmon/applesmc.c:510:52: sparse: got unsigned char [usertype] *
drivers/hwmon/applesmc.c:511:39: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void [noderef] __iomem * @@ got unsigned char [usertype] * @@
drivers/hwmon/applesmc.c:511:39: sparse: expected void [noderef] __iomem *
drivers/hwmon/applesmc.c:511:39: sparse: got unsigned char [usertype] *
drivers/hwmon/applesmc.c:512:63: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void [noderef] __iomem * @@ got unsigned char [usertype] * @@
drivers/hwmon/applesmc.c:512:63: sparse: expected void [noderef] __iomem *
drivers/hwmon/applesmc.c:512:63: sparse: got unsigned char [usertype] *
drivers/hwmon/applesmc.c:517:41: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void const [noderef] __iomem * @@ got unsigned char [usertype] * @@
drivers/hwmon/applesmc.c:517:41: sparse: expected void const [noderef] __iomem *
drivers/hwmon/applesmc.c:517:41: sparse: got unsigned char [usertype] *
drivers/hwmon/applesmc.c:521:58: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void const [noderef] __iomem * @@ got unsigned char [usertype] * @@
drivers/hwmon/applesmc.c:521:58: sparse: expected void const [noderef] __iomem *
drivers/hwmon/applesmc.c:521:58: sparse: got unsigned char [usertype] *
drivers/hwmon/applesmc.c:522:48: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void const [noderef] __iomem * @@ got unsigned char [usertype] * @@
drivers/hwmon/applesmc.c:522:48: sparse: expected void const [noderef] __iomem *
drivers/hwmon/applesmc.c:522:48: sparse: got unsigned char [usertype] *
drivers/hwmon/applesmc.c:523:50: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void const [noderef] __iomem * @@ got unsigned char [usertype] * @@
drivers/hwmon/applesmc.c:523:50: sparse: expected void const [noderef] __iomem *
drivers/hwmon/applesmc.c:523:50: sparse: got unsigned char [usertype] *
>> drivers/hwmon/applesmc.c:740:19: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected unsigned char [usertype] *static [noderef] [toplevel] __iomem mmio_base @@ got void [noderef] __iomem * @@
drivers/hwmon/applesmc.c:740:19: sparse: expected unsigned char [usertype] *static [noderef] [toplevel] __iomem mmio_base
drivers/hwmon/applesmc.c:740:19: sparse: got void [noderef] __iomem *
drivers/hwmon/applesmc.c:745:31: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void const [noderef] __iomem * @@ got unsigned char [usertype] * @@
drivers/hwmon/applesmc.c:745:31: sparse: expected void const [noderef] __iomem *
drivers/hwmon/applesmc.c:745:31: sparse: got unsigned char [usertype] *
>> drivers/hwmon/applesmc.c:757:17: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void volatile [noderef] __iomem *addr @@ got unsigned char [usertype] *static [noderef] [toplevel] __iomem mmio_base @@
drivers/hwmon/applesmc.c:757:17: sparse: expected void volatile [noderef] __iomem *addr
drivers/hwmon/applesmc.c:757:17: sparse: got unsigned char [usertype] *static [noderef] [toplevel] __iomem mmio_base
drivers/hwmon/applesmc.c:1611:25: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void volatile [noderef] __iomem *addr @@ got unsigned char [usertype] *static [noderef] [toplevel] __iomem mmio_base @@
drivers/hwmon/applesmc.c:1611:25: sparse: expected void volatile [noderef] __iomem *addr
drivers/hwmon/applesmc.c:1611:25: sparse: got unsigned char [usertype] *static [noderef] [toplevel] __iomem mmio_base
>> drivers/hwmon/applesmc.c:257:21: sparse: sparse: dereference of noderef expression
drivers/hwmon/applesmc.c:258:36: sparse: sparse: dereference of noderef expression
drivers/hwmon/applesmc.c:269:34: sparse: sparse: dereference of noderef expression
drivers/hwmon/applesmc.c:281:34: sparse: sparse: dereference of noderef expression
drivers/hwmon/applesmc.c:282:24: sparse: sparse: dereference of noderef expression
drivers/hwmon/applesmc.c:283:23: sparse: sparse: dereference of noderef expression
drivers/hwmon/applesmc.c:288:21: sparse: sparse: dereference of noderef expression
drivers/hwmon/applesmc.c:292:29: sparse: sparse: dereference of noderef expression
drivers/hwmon/applesmc.c:299:61: sparse: sparse: dereference of noderef expression
drivers/hwmon/applesmc.c:302:71: sparse: sparse: dereference of noderef expression
drivers/hwmon/applesmc.c:306:63: sparse: sparse: dereference of noderef expression
drivers/hwmon/applesmc.c:311:39: sparse: sparse: dereference of noderef expression
drivers/hwmon/applesmc.c:320:34: sparse: sparse: dereference of noderef expression
drivers/hwmon/applesmc.c:324:53: sparse: sparse: dereference of noderef expression
drivers/hwmon/applesmc.c:327:63: sparse: sparse: dereference of noderef expression
drivers/hwmon/applesmc.c:331:55: sparse: sparse: dereference of noderef expression
drivers/hwmon/applesmc.c:335:23: sparse: sparse: dereference of noderef expression
drivers/hwmon/applesmc.c:336:24: sparse: sparse: dereference of noderef expression
drivers/hwmon/applesmc.c:337:23: sparse: sparse: dereference of noderef expression
drivers/hwmon/applesmc.c:341:21: sparse: sparse: dereference of noderef expression
drivers/hwmon/applesmc.c:510:42: sparse: sparse: dereference of noderef expression
drivers/hwmon/applesmc.c:511:29: sparse: sparse: dereference of noderef expression
drivers/hwmon/applesmc.c:512:53: sparse: sparse: dereference of noderef expression
drivers/hwmon/applesmc.c:517:31: sparse: sparse: dereference of noderef expression
drivers/hwmon/applesmc.c:521:48: sparse: sparse: dereference of noderef expression
drivers/hwmon/applesmc.c:522:38: sparse: sparse: dereference of noderef expression
drivers/hwmon/applesmc.c:523:40: sparse: sparse: dereference of noderef expression
drivers/hwmon/applesmc.c:742:14: sparse: sparse: dereference of noderef expression
drivers/hwmon/applesmc.c:745:21: sparse: sparse: dereference of noderef expression
drivers/hwmon/applesmc.c:757:17: sparse: sparse: dereference of noderef expression
drivers/hwmon/applesmc.c:1611:25: sparse: sparse: dereference of noderef expression
vim +257 drivers/hwmon/applesmc.c
250
251 /*
252 * MMIO Impliementation
253 */
254
255 static void clearArbitration(void)
256 {
> 257 if (ioread8(mmio_base + 0x4005))
> 258 return iowrite8(0, mmio_base + 0x4005);
259 }
260 static int waitForKeyDone(void)
261 {
262 int i = 1000; //millisecounds
263 u8 status;
264
265 while (i) {
266 msleep(1);
267 i--;
268
269 status = ioread8(mmio_base + 0x4005);
270 if (status & 0x20)
271 return 0;
272 }
273
274 return -EIO;
275 }
276 static int mmio_read_smc(u8 cmd, const char *key, u8 *buffer, u64 len)
277 {
278 u8 i, u = 0;
279
280 clearArbitration();
281 iowrite32(*((u32 *)key), mmio_base + 0x78);
282 iowrite8(0x15, mmio_base + 0x7E);
283 iowrite8(cmd, mmio_base + 0x7F);
284
285 if (waitForKeyDone())
286 return -EIO;
287
288 i = ioread8(mmio_base + 0x7F);
289 if (i)
290 return -EIO;
291 if (cmd == APPLESMC_READ_CMD) {
292 i = ioread8(mmio_base + 0x7D);
293 if (i > len || !i)
294 return -EIO;
295
296 while (u < i) {
297 if ((i - u) < 4) {
298 if ((i - u) < 2) {
299 buffer[u] = ioread8(mmio_base + u);
300 u += 1;
301 } else {
302 *(u16 *)&buffer[u] = ioread16(mmio_base + u);
303 u += 2;
304 }
305 } else {
306 *(u32 *)&buffer[u] = ioread32(mmio_base + u);
307 u += 4;
308 }
309 }
310 } else
> 311 memcpy_fromio(buffer, mmio_base + 0x0, len);
312
313 return 0;
314 }
315 static int mmio_write_smc(u8 cmd, const char *key, const u8 *buffer, u8 len)
316 {
317 u8 i = 0;
318
319 clearArbitration();
320 iowrite32(*((u32 *)key), mmio_base + 0x78);
321 while (i < len) {
322 if (len - i < 4) {
323 if (len - i < 2) {
324 iowrite8(buffer[i], mmio_base + i);
325 i += 1;
326 } else {
327 iowrite16(*(u16 *)&buffer[i], mmio_base + i);
328 i += 2;
329 }
330 } else {
331 iowrite32(*(u32 *)&buffer[i], mmio_base + i);
332 i += 4;
333 }
334 }
335 iowrite8(len, mmio_base + 0x7D);
336 iowrite8(0x15, mmio_base + 0x7E);
337 iowrite8(cmd, mmio_base + 0x7F);
338 if (waitForKeyDone())
339 return -EIO;
340
341 i = ioread8(mmio_base + 0x7F);
342 if (i)
343 return -EIO;
344
345 return 0;
346 }
347
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
Hi Subu,
kernel test robot noticed the following build errors:
[auto build test ERROR on groeck-staging/hwmon-next]
[also build test ERROR on linus/master v6.14-rc6 next-20250313]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]
url: https://github.com/intel-lab-lkp/linux/commits/Subu-Dwevedi/hwmon-applesmc-add-MMIO-for-newer-macs/20250312-203248
base: https://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging.git hwmon-next
patch link: https://lore.kernel.org/r/20250312123055.1735-2-messigoatcr7nop%40gmail.com
patch subject: [PATCH 1/2] hwmon/applesmc: add MMIO for newer macs
config: x86_64-buildonly-randconfig-002-20250313 (https://download.01.org/0day-ci/archive/20250314/202503140229.R49CaAYj-lkp@intel.com/config)
compiler: clang version 19.1.7 (https://github.com/llvm/llvm-project cd708029e0b2869e80abe31ddb175f7c35361f90)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250314/202503140229.R49CaAYj-lkp@intel.com/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202503140229.R49CaAYj-lkp@intel.com/
All errors (new ones prefixed by >>):
>> drivers/hwmon/applesmc.c:717:42: error: incomplete definition of type 'struct acpi_device'
717 | status = acpi_get_current_resources(adev->handle, &buffer);
| ~~~~^
include/linux/acpi.h:801:8: note: forward declaration of 'struct acpi_device'
801 | struct acpi_device;
| ^
1 error generated.
vim +717 drivers/hwmon/applesmc.c
678
679 static int applesmc_init_index(struct applesmc_registers *s)
680 {
681 const struct applesmc_entry *entry;
682 unsigned int i;
683
684 if (s->index)
685 return 0;
686
687 s->index = kcalloc(s->temp_count, sizeof(s->index[0]), GFP_KERNEL);
688 if (!s->index)
689 return -ENOMEM;
690
691 for (i = s->temp_begin; i < s->temp_end; i++) {
692 entry = applesmc_get_entry_by_index(i);
693 if (IS_ERR(entry))
694 continue;
695 if (strcmp(entry->type, TEMP_SENSOR_TYPE))
696 continue;
697 s->index[s->index_count++] = entry->key;
698 }
699
700 return 0;
701 }
702 /*
703 * applesmc_init_mmio_try - Try to initialize MMIO
704 */
705 static int applesmc_init_mmio_try(void)
706 {
707 u8 ldkn_version;
708 acpi_status status;
709 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
710 struct acpi_device *adev;
711 struct acpi_resource *res;
712
713 adev = acpi_dev_get_first_match_dev("APP0001", NULL, -1);
714 if (!adev)
715 return -ENXIO;
716
> 717 status = acpi_get_current_resources(adev->handle, &buffer);
718 if (ACPI_FAILURE(status))
719 return -ENXIO;
720
721 res = buffer.pointer;
722 while (res->type != ACPI_RESOURCE_TYPE_END_TAG) {
723 if (res->type == ACPI_RESOURCE_TYPE_FIXED_MEMORY32) {
724 if (res->data.fixed_memory32.address_length < 0x4006)
725 return -ENXIO;
726
727 mmio_base_addr = res->data.fixed_memory32.address;
728 mmio_base_size = res->data.fixed_memory32.address_length;
729 is_mmio = true;
730 break;
731 }
732 res = ACPI_NEXT_RESOURCE(res);
733 }
734 kfree(buffer.pointer);
735 acpi_dev_put(adev);
736
737 if (!is_mmio)
738 return -ENXIO;
739
740 mmio_base = ioremap(mmio_base_addr, mmio_base_size);
741
742 if (!mmio_base)
743 return -ENXIO;
744
745 if (ioread8(mmio_base + 0x4005) == 0xFF)
746 goto out;
747
748 if (read_smc(APPLESMC_READ_CMD, "LDKN", &ldkn_version, 1))
749 goto out;
750
751 if (ldkn_version < 2)
752 goto out;
753
754 return 0;
755 out:
756 pr_warn("cannot enable MMIO will use PMIO\n");
757 iounmap(mmio_base);
758 return -ENXIO;
759 }
760 /*
761 * applesmc_init_smcreg_try - Try to initialize register cache. Idempotent.
762 */
763 static int applesmc_init_smcreg_try(void)
764 {
765 struct applesmc_registers *s = &smcreg;
766 bool left_light_sensor = false, right_light_sensor = false;
767 unsigned int count;
768 u8 tmp[1];
769 int ret;
770
771 if (s->init_complete)
772 return 0;
773
774 ret = read_register_count(&count);
775 if (ret)
776 return ret;
777
778 if (s->cache && s->key_count != count) {
779 pr_warn("key count changed from %d to %d\n",
780 s->key_count, count);
781 kfree(s->cache);
782 s->cache = NULL;
783 }
784 s->key_count = count;
785
786 if (!s->cache)
787 s->cache = kcalloc(s->key_count, sizeof(*s->cache), GFP_KERNEL);
788 if (!s->cache)
789 return -ENOMEM;
790
791 ret = applesmc_read_key(FANS_COUNT, tmp, 1);
792 if (ret)
793 return ret;
794 s->fan_count = tmp[0];
795 if (s->fan_count > 10)
796 s->fan_count = 10;
797
798 ret = applesmc_get_lower_bound(&s->temp_begin, "T");
799 if (ret)
800 return ret;
801 ret = applesmc_get_lower_bound(&s->temp_end, "U");
802 if (ret)
803 return ret;
804 s->temp_count = s->temp_end - s->temp_begin;
805
806 ret = applesmc_init_index(s);
807 if (ret)
808 return ret;
809
810 ret = applesmc_has_key(LIGHT_SENSOR_LEFT_KEY, &left_light_sensor);
811 if (ret)
812 return ret;
813 ret = applesmc_has_key(LIGHT_SENSOR_RIGHT_KEY, &right_light_sensor);
814 if (ret)
815 return ret;
816 ret = applesmc_has_key(MOTION_SENSOR_KEY, &s->has_accelerometer);
817 if (ret)
818 return ret;
819 ret = applesmc_has_key(BACKLIGHT_KEY, &s->has_key_backlight);
820 if (ret)
821 return ret;
822
823 s->num_light_sensors = left_light_sensor + right_light_sensor;
824 s->init_complete = true;
825
826 pr_info("key=%d fan=%d temp=%d index=%d acc=%d lux=%d kbd=%d\n",
827 s->key_count, s->fan_count, s->temp_count, s->index_count,
828 s->has_accelerometer,
829 s->num_light_sensors,
830 s->has_key_backlight);
831
832 return 0;
833 }
834
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
© 2016 - 2026 Red Hat, Inc.