The proc write routine shared by all Suspend2 proc entries.
Signed-off-by: Nigel Cunningham <[email protected]>
kernel/power/proc.c | 133 +++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 133 insertions(+), 0 deletions(-)
diff --git a/kernel/power/proc.c b/kernel/power/proc.c
index e072b50..cdbf9cf 100644
--- a/kernel/power/proc.c
+++ b/kernel/power/proc.c
@@ -98,3 +98,136 @@ static int suspend_read_proc(char *page,
return len;
}
+/* suspend_write_proc
+ *
+ * Generic routine for handling writing to files representing
+ * bits, integers and unsigned longs.
+ */
+
+static int suspend_write_proc(struct file *file, const char *buffer,
+ unsigned long count, void *data)
+{
+ struct suspend_proc_data *proc_data = (struct suspend_proc_data *) data;
+ char *my_buf = (char *) get_zeroed_page(GFP_ATOMIC);
+ int result = count, assigned_temp_buffer = 0;
+
+ if (!my_buf)
+ return -ENOMEM;
+
+ if (count > PAGE_SIZE)
+ count = PAGE_SIZE;
+
+ if (copy_from_user(my_buf, buffer, count))
+ return -EFAULT;
+
+ if (suspend_start_anything(proc_data == &proc_params[0]))
+ return -EBUSY;
+
+ my_buf[count] = 0;
+
+ if (proc_data->needs_storage_manager & 2)
+ suspend_prepare_usm();
+
+ switch (proc_data->type) {
+ case SUSPEND_PROC_DATA_CUSTOM:
+ if (proc_data->data.special.write_proc) {
+ write_proc_t *write_proc = proc_data->data.special.write_proc;
+ result = write_proc(file, buffer, count, data);
+ }
+ break;
+ case SUSPEND_PROC_DATA_BIT:
+ {
+ int value = simple_strtoul(my_buf, NULL, 0);
+ if (value)
+ set_bit(proc_data->data.bit.bit,
+ (proc_data->data.bit.bit_vector));
+ else
+ clear_bit(proc_data->data.bit.bit,
+ (proc_data->data.bit.bit_vector));
+ }
+ break;
+ case SUSPEND_PROC_DATA_INTEGER:
+ {
+ int *variable = proc_data->data.integer.variable;
+ int minimum = proc_data->data.integer.minimum;
+ int maximum = proc_data->data.integer.maximum;
+ *variable = simple_strtol(my_buf, NULL, 0);
+
+ if (maximum && ((*variable) < minimum))
+ *variable = minimum;
+
+ if (maximum && ((*variable) > maximum))
+ *variable = maximum;
+ break;
+ }
+ case SUSPEND_PROC_DATA_LONG:
+ {
+ long *variable = proc_data->data.a_long.variable;
+ long minimum = proc_data->data.a_long.minimum;
+ long maximum = proc_data->data.a_long.maximum;
+ *variable = simple_strtol(my_buf, NULL, 0);
+
+ if (maximum && ((*variable) < minimum))
+ *variable = minimum;
+
+ if (maximum && ((*variable) > maximum))
+ *variable = maximum;
+ break;
+ }
+ case SUSPEND_PROC_DATA_UL:
+ {
+ unsigned long *variable = proc_data->data.ul.variable;
+ unsigned long minimum = proc_data->data.ul.minimum;
+ unsigned long maximum = proc_data->data.ul.maximum;
+ *variable = simple_strtoul(my_buf, NULL, 0);
+
+ if (maximum && ((*variable) < minimum))
+ *variable = minimum;
+
+ if (maximum && ((*variable) > maximum))
+ *variable = maximum;
+ break;
+ }
+ break;
+ case SUSPEND_PROC_DATA_STRING:
+ {
+ int copy_len = count;
+ char *variable =
+ proc_data->data.string.variable;
+
+ if (proc_data->data.string.max_length &&
+ (copy_len > proc_data->data.string.max_length))
+ copy_len = proc_data->data.string.max_length;
+
+ if (!variable) {
+ proc_data->data.string.variable =
+ variable = (char *) get_zeroed_page(GFP_ATOMIC);
+ assigned_temp_buffer = 1;
+ }
+ strncpy(variable, my_buf, copy_len);
+ if ((copy_len) &&
+ (my_buf[copy_len - 1] == '\n'))
+ variable[count - 1] = 0;
+ variable[count] = 0;
+ }
+ break;
+ }
+ free_page((unsigned long) my_buf);
+ /* Side effect routine? */
+ if (proc_data->write_proc)
+ proc_data->write_proc();
+
+ /* Free temporary buffers */
+ if (assigned_temp_buffer) {
+ free_page((unsigned long) proc_data->data.string.variable);
+ proc_data->data.string.variable = NULL;
+ }
+
+ if (proc_data->needs_storage_manager & 2)
+ suspend_cleanup_usm();
+
+ suspend_finish_anything(proc_data == &proc_params[0]);
+
+ return result;
+}
+
--
Nigel Cunningham nigel at suspend2 dot net
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