}
EXPORT_SYMBOL(acpi_parse_art);
+/*
+ * acpi_parse_psvt - Passive Table (PSVT) for passive cooling
+ *
+ * @handle: ACPI handle of the device which contains PSVT
+ * @psvt_count: the number of valid entries resulted from parsing PSVT
+ * @psvtp: pointer to array of psvt entries
+ *
+ */
+static int acpi_parse_psvt(acpi_handle handle, int *psvt_count, struct psvt **psvtp)
+{
+ struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
+ int nr_bad_entries = 0, revision = 0;
+ union acpi_object *p;
+ acpi_status status;
+ int i, result = 0;
+ struct psvt *psvts;
+
+ if (!acpi_has_method(handle, "PSVT"))
+ return -ENODEV;
+
+ status = acpi_evaluate_object(handle, "PSVT", NULL, &buffer);
+ if (ACPI_FAILURE(status))
+ return -ENODEV;
+
+ p = buffer.pointer;
+ if (!p || (p->type != ACPI_TYPE_PACKAGE)) {
+ result = -EFAULT;
+ goto end;
+ }
+
+ /* first package is the revision number */
+ if (p->package.count > 0) {
+ union acpi_object *prev = &(p->package.elements[0]);
+
+ if (prev->type == ACPI_TYPE_INTEGER)
+ revision = (int)prev->integer.value;
+ } else {
+ result = -EFAULT;
+ goto end;
+ }
+
+ /* Support only version 2 */
+ if (revision != 2) {
+ result = -EFAULT;
+ goto end;
+ }
+
+ *psvt_count = p->package.count - 1;
+ if (!*psvt_count) {
+ result = -EFAULT;
+ goto end;
+ }
+
+ psvts = kcalloc(*psvt_count, sizeof(*psvts), GFP_KERNEL);
+ if (!psvts) {
+ result = -ENOMEM;
+ goto end;
+ }
+
+ /* Start index is 1 because the first package is the revision number */
+ for (i = 1; i < p->package.count; i++) {
+ struct acpi_buffer psvt_int_format = { sizeof("RRNNNNNNNNNN"), "RRNNNNNNNNNN" };
+ struct acpi_buffer psvt_str_format = { sizeof("RRNNNNNSNNNN"), "RRNNNNNSNNNN" };
+ union acpi_object *package = &(p->package.elements[i]);
+ struct psvt *psvt = &psvts[i - 1 - nr_bad_entries];
+ struct acpi_buffer *psvt_format = &psvt_int_format;
+ struct acpi_buffer element = { 0, NULL };
+ union acpi_object *knob;
+ struct acpi_device *res;
+ struct psvt *psvt_ptr;
+
+ element.length = ACPI_ALLOCATE_BUFFER;
+ element.pointer = NULL;
+
+ if (package->package.count >= ACPI_NR_PSVT_ELEMENTS) {
+ knob = &(package->package.elements[ACPI_PSVT_CONTROL_KNOB]);
+ } else {
+ nr_bad_entries++;
+ pr_info("PSVT package %d is invalid, ignored\n", i);
+ continue;
+ }
+
+ if (knob->type == ACPI_TYPE_STRING) {
+ psvt_format = &psvt_str_format;
+ if (knob->string.length > ACPI_LIMIT_STR_MAX_LEN - 1) {
+ pr_info("PSVT package %d limit string len exceeds max\n", i);
+ knob->string.length = ACPI_LIMIT_STR_MAX_LEN - 1;
+ }
+ }
+
+ status = acpi_extract_package(&(p->package.elements[i]), psvt_format, &element);
+ if (ACPI_FAILURE(status)) {
+ nr_bad_entries++;
+ pr_info("PSVT package %d is invalid, ignored\n", i);
+ continue;
+ }
+
+ psvt_ptr = (struct psvt *)element.pointer;
+
+ memcpy(psvt, psvt_ptr, sizeof(*psvt));
+
+ /* The limit element can be string or U64 */
+ psvt->control_knob_type = (u64)knob->type;
+
+ if (knob->type == ACPI_TYPE_STRING) {
+ memset(&psvt->limit, 0, sizeof(u64));
+ strncpy(psvt->limit.string, psvt_ptr->limit.str_ptr, knob->string.length);
+ } else {
+ psvt->limit.integer = psvt_ptr->limit.integer;
+ }
+
+ kfree(element.pointer);
+
+ res = acpi_fetch_acpi_dev(psvt->source);
+ if (!res) {
+ nr_bad_entries++;
+ pr_info("Failed to get source ACPI device\n");
+ continue;
+ }
+
+ res = acpi_fetch_acpi_dev(psvt->target);
+ if (!res) {
+ nr_bad_entries++;
+ pr_info("Failed to get target ACPI device\n");
+ continue;
+ }
+ }
+
+ /* don't count bad entries */
+ *psvt_count -= nr_bad_entries;
+
+ if (!*psvt_count) {
+ result = -EFAULT;
+ kfree(psvts);
+ goto end;
+ }
+
+ *psvtp = psvts;
+
+ return 0;
+
+end:
+ kfree(buffer.pointer);
+ return result;
+}
/* get device name from acpi handle */
static void get_single_name(acpi_handle handle, char *name)
return ret;
}
+static int fill_psvt(char __user *ubuf)
+{
+ int i, ret, count, psvt_len;
+ union psvt_object *psvt_user;
+ struct psvt *psvts;
+
+ ret = acpi_parse_psvt(acpi_thermal_rel_handle, &count, &psvts);
+ if (ret)
+ return ret;
+
+ psvt_len = count * sizeof(*psvt_user);
+
+ psvt_user = kzalloc(psvt_len, GFP_KERNEL);
+ if (!psvt_user) {
+ ret = -ENOMEM;
+ goto free_psvt;
+ }
+
+ /* now fill in user psvt data */
+ for (i = 0; i < count; i++) {
+ /* userspace psvt needs device name instead of acpi reference */
+ get_single_name(psvts[i].source, psvt_user[i].source_device);
+ get_single_name(psvts[i].target, psvt_user[i].target_device);
+
+ psvt_user[i].priority = psvts[i].priority;
+ psvt_user[i].sample_period = psvts[i].sample_period;
+ psvt_user[i].passive_temp = psvts[i].passive_temp;
+ psvt_user[i].source_domain = psvts[i].source_domain;
+ psvt_user[i].control_knob = psvts[i].control_knob;
+ psvt_user[i].step_size = psvts[i].step_size;
+ psvt_user[i].limit_coeff = psvts[i].limit_coeff;
+ psvt_user[i].unlimit_coeff = psvts[i].unlimit_coeff;
+ psvt_user[i].control_knob_type = psvts[i].control_knob_type;
+ if (psvt_user[i].control_knob_type == ACPI_TYPE_STRING)
+ strncpy(psvt_user[i].limit.string, psvts[i].limit.string,
+ ACPI_LIMIT_STR_MAX_LEN);
+ else
+ psvt_user[i].limit.integer = psvts[i].limit.integer;
+
+ }
+
+ if (copy_to_user(ubuf, psvt_user, psvt_len))
+ ret = -EFAULT;
+
+ kfree(psvt_user);
+
+free_psvt:
+ kfree(psvts);
+ return ret;
+}
+
static long acpi_thermal_rel_ioctl(struct file *f, unsigned int cmd,
unsigned long __arg)
{
char __user *arg = (void __user *)__arg;
struct trt *trts = NULL;
struct art *arts = NULL;
+ struct psvt *psvts;
switch (cmd) {
case ACPI_THERMAL_GET_TRT_COUNT:
case ACPI_THERMAL_GET_ART:
return fill_art(arg);
+ case ACPI_THERMAL_GET_PSVT_COUNT:
+ ret = acpi_parse_psvt(acpi_thermal_rel_handle, &count, &psvts);
+ if (!ret) {
+ kfree(psvts);
+ return put_user(count, (unsigned long __user *)__arg);
+ }
+ return ret;
+
+ case ACPI_THERMAL_GET_PSVT_LEN:
+ /* total length of the data retrieved (count * PSVT entry size) */
+ ret = acpi_parse_psvt(acpi_thermal_rel_handle, &count, &psvts);
+ length = count * sizeof(union psvt_object);
+ if (!ret) {
+ kfree(psvts);
+ return put_user(length, (unsigned long __user *)__arg);
+ }
+ return ret;
+
+ case ACPI_THERMAL_GET_PSVT:
+ return fill_psvt(arg);
+
default:
return -ENOTTY;
}
#define ACPI_THERMAL_GET_TRT _IOR(ACPI_THERMAL_MAGIC, 5, unsigned long)
#define ACPI_THERMAL_GET_ART _IOR(ACPI_THERMAL_MAGIC, 6, unsigned long)
+/*
+ * ACPI_THERMAL_GET_PSVT_COUNT = Number of PSVT entries
+ * ACPI_THERMAL_GET_PSVT_LEN = Total return data size (PSVT count x each
+ * PSVT entry size)
+ * ACPI_THERMAL_GET_PSVT = Get the data as an array of psvt_objects
+ */
+#define ACPI_THERMAL_GET_PSVT_LEN _IOR(ACPI_THERMAL_MAGIC, 7, unsigned long)
+#define ACPI_THERMAL_GET_PSVT_COUNT _IOR(ACPI_THERMAL_MAGIC, 8, unsigned long)
+#define ACPI_THERMAL_GET_PSVT _IOR(ACPI_THERMAL_MAGIC, 9, unsigned long)
+
struct art {
acpi_handle source;
acpi_handle target;
u64 reserved4;
} __packed;
+#define ACPI_NR_PSVT_ELEMENTS 12
+#define ACPI_PSVT_CONTROL_KNOB 7
+#define ACPI_LIMIT_STR_MAX_LEN 8
+
+struct psvt {
+ acpi_handle source;
+ acpi_handle target;
+ u64 priority;
+ u64 sample_period;
+ u64 passive_temp;
+ u64 source_domain;
+ u64 control_knob;
+ union {
+ /* For limit_type = ACPI_TYPE_INTEGER */
+ u64 integer;
+ /* For limit_type = ACPI_TYPE_STRING */
+ char string[ACPI_LIMIT_STR_MAX_LEN];
+ char *str_ptr;
+ } limit;
+ u64 step_size;
+ u64 limit_coeff;
+ u64 unlimit_coeff;
+ /* Spec calls this field reserved, so we borrow it for type info */
+ u64 control_knob_type; /* ACPI_TYPE_STRING or ACPI_TYPE_INTEGER */
+} __packed;
+
#define ACPI_NR_ART_ELEMENTS 13
/* for usrspace */
union art_object {
u64 __data[8];
};
+union psvt_object {
+ struct {
+ char source_device[8];
+ char target_device[8];
+ u64 priority;
+ u64 sample_period;
+ u64 passive_temp;
+ u64 source_domain;
+ u64 control_knob;
+ union {
+ u64 integer;
+ char string[ACPI_LIMIT_STR_MAX_LEN];
+ } limit;
+ u64 step_size;
+ u64 limit_coeff;
+ u64 unlimit_coeff;
+ u64 control_knob_type;
+ };
+ u64 __data[ACPI_NR_PSVT_ELEMENTS];
+};
+
#ifdef __KERNEL__
int acpi_thermal_rel_misc_device_add(acpi_handle handle);
int acpi_thermal_rel_misc_device_remove(acpi_handle handle);
projects / linux-2.6-microblaze.git / commitdiff