drivers: android: Place a no-op PSI driver for SLMK

Signed-off-by: atndko <z1281552865@gmail.com>
Signed-off-by: Jebaitedneko <Jebaitedneko@gmail.com>
Signed-off-by: Panchajanya1999 <rsk52959@gmail.com>

drivers/android/Makefile

@@ -3,4 +3,4 @@ ccflags-y += -I$(src)			# needed for trace events
 obj-$(CONFIG_ANDROID_BINDERFS)		+= binderfs.o
 obj-$(CONFIG_ANDROID_BINDER_IPC)	+= binder.o binder_alloc.o
 obj-$(CONFIG_ANDROID_BINDER_IPC_SELFTEST) += binder_alloc_selftest.o
-obj-$(CONFIG_ANDROID_SIMPLE_LMK)	+= simple_lmk.o
+obj-$(CONFIG_ANDROID_SIMPLE_LMK)	+= simple_lmk.o psi.o

drivers/android/psi.c

@@ -0,0 +1,111 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/seq_file.h>
+#include <linux/proc_fs.h>
+#include <linux/uaccess.h>
+#include <linux/module.h>
+#include <linux/poll.h>
+
+static bool psi_enable = true;
+
+static int __init setup_psi(char *str)
+{
+	return kstrtobool(str, &psi_enable) == 0;
+}
+__setup("psi=", setup_psi);
+
+static int psi_io_show(struct seq_file *m, void *v)
+{
+	return 0;
+}
+
+static int psi_memory_show(struct seq_file *m, void *v)
+{
+	return 0;
+}
+
+static int psi_cpu_show(struct seq_file *m, void *v)
+{
+	return 0;
+}
+
+static int psi_io_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, psi_io_show, NULL);
+}
+
+static int psi_memory_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, psi_memory_show, NULL);
+}
+
+static int psi_cpu_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, psi_cpu_show, NULL);
+}
+
+static ssize_t psi_io_write(struct file *file, const char __user *user_buf,
+			    size_t nbytes, loff_t *ppos)
+{
+	return 0;
+}
+
+static ssize_t psi_memory_write(struct file *file, const char __user *user_buf,
+				size_t nbytes, loff_t *ppos)
+{
+	return 0;
+}
+
+static ssize_t psi_cpu_write(struct file *file, const char __user *user_buf,
+			     size_t nbytes, loff_t *ppos)
+{
+	return 0;
+}
+
+static __poll_t psi_fop_poll(struct file *file, poll_table *wait)
+{
+	return 0;
+}
+
+static int psi_fop_release(struct inode *inode, struct file *file)
+{
+	return 0;
+}
+
+static const struct file_operations psi_io_fops = {
+	.open           = psi_io_open,
+	.read           = seq_read,
+	.llseek         = seq_lseek,
+	.write          = psi_io_write,
+	.poll           = psi_fop_poll,
+	.release        = psi_fop_release,
+};
+
+static const struct file_operations psi_memory_fops = {
+	.open           = psi_memory_open,
+	.read           = seq_read,
+	.llseek         = seq_lseek,
+	.write          = psi_memory_write,
+	.poll           = psi_fop_poll,
+	.release        = psi_fop_release,
+};
+
+static const struct file_operations psi_cpu_fops = {
+	.open           = psi_cpu_open,
+	.read           = seq_read,
+	.llseek         = seq_lseek,
+	.write          = psi_cpu_write,
+	.poll           = psi_fop_poll,
+	.release        = psi_fop_release,
+};
+
+static int __init psi_proc_init(void)
+{
+	proc_mkdir("pressure", NULL);
+	proc_create("pressure/io", 0, NULL, &psi_io_fops);
+	proc_create("pressure/memory", 0, NULL, &psi_memory_fops);
+	proc_create("pressure/cpu", 0, NULL, &psi_cpu_fops);
+
+	return 0;
+}
+module_init(psi_proc_init);