misc: bcm-vk: only support ttyVK if CONFIG_TTY is set

Correct compile issue if CONFIG_TTY is not set by
only adding ttyVK devices if CONFIG_BCM_VK_TTY is set.

Reported-by: Randy Dunlap <[e-mail]>
Acked-by: Randy Dunlap <[e-mail]> # build-tested
Signed-off-by: Scott Branden <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/misc/bcm-vk/Kconfig

···
 	  accelerators via /dev/bcm-vk.N devices.
 
 	  If unsure, say N.
+
+config BCM_VK_TTY
+	bool "Enable tty ports on a Broadcom VK Accelerator device"
+	depends on TTY
+	depends on BCM_VK
+	help
+	  Select this option to enable tty support to allow console
+	  access to Broadcom VK Accelerator cards from host.
+
+	  Device node will in the form /dev/bcm-vk.x_ttyVKy where:
+	  x is the instance of the VK card
+	  y is the tty device number on the VK card.

drivers/misc/bcm-vk/Makefile

···
 bcm_vk-objs := \
 	bcm_vk_dev.o \
 	bcm_vk_msg.o \
-	bcm_vk_sg.o \
-	bcm_vk_tty.o
+	bcm_vk_sg.o
 
+bcm_vk-$(CONFIG_BCM_VK_TTY) += bcm_vk_tty.o

drivers/misc/bcm-vk/bcm_vk.h

···
 	BAR_2
 };
 
+#ifdef CONFIG_BCM_VK_TTY
 #define BCM_VK_NUM_TTY 2
+#else
+#define BCM_VK_NUM_TTY 0
+#endif
 
 struct bcm_vk_tty {
 	struct tty_port port;
···
 	struct miscdevice miscdev;
 	int devid; /* dev id allocated */
 
+#ifdef CONFIG_BCM_VK_TTY
 	struct tty_driver *tty_drv;
 	struct timer_list serial_timer;
 	struct bcm_vk_tty tty[BCM_VK_NUM_TTY];
 	struct workqueue_struct *tty_wq_thread;
 	struct work_struct tty_wq_work;
+#endif
 
 	/* Reference-counting to handle file operations */
 	struct kref kref;
···
 			     const pid_t pid, const u32 q_num);
 void bcm_to_v_q_doorbell(struct bcm_vk *vk, u32 q_num, u32 db_val);
 int bcm_vk_auto_load_all_images(struct bcm_vk *vk);
-int bcm_vk_tty_init(struct bcm_vk *vk, char *name);
-void bcm_vk_tty_exit(struct bcm_vk *vk);
-void bcm_vk_tty_terminate_tty_user(struct bcm_vk *vk);
 void bcm_vk_hb_init(struct bcm_vk *vk);
 void bcm_vk_hb_deinit(struct bcm_vk *vk);
 void bcm_vk_handle_notf(struct bcm_vk *vk);
 bool bcm_vk_drv_access_ok(struct bcm_vk *vk);
 void bcm_vk_set_host_alert(struct bcm_vk *vk, u32 bit_mask);
+
+#ifdef CONFIG_BCM_VK_TTY
+int bcm_vk_tty_init(struct bcm_vk *vk, char *name);
+void bcm_vk_tty_exit(struct bcm_vk *vk);
+void bcm_vk_tty_terminate_tty_user(struct bcm_vk *vk);
+void bcm_vk_tty_wq_exit(struct bcm_vk *vk);
+
+static inline void bcm_vk_tty_set_irq_enabled(struct bcm_vk *vk, int index)
+{
+	vk->tty[index].irq_enabled = true;
+}
+#else
+static inline int bcm_vk_tty_init(struct bcm_vk *vk, char *name)
+{
+	return 0;
+}
+
+static inline void bcm_vk_tty_exit(struct bcm_vk *vk)
+{
+}
+
+static inline void bcm_vk_tty_terminate_tty_user(struct bcm_vk *vk)
+{
+}
+
+static inline void bcm_vk_tty_wq_exit(struct bcm_vk *vk)
+{
+}
+
+static inline void bcm_vk_tty_set_irq_enabled(struct bcm_vk *vk, int index)
+{
+}
+#endif /* CONFIG_BCM_VK_TTY */
 
 #endif

drivers/misc/bcm-vk/bcm_vk_dev.c

···
 				pdev->irq + vk->num_irqs, vk->num_irqs + 1);
 			goto err_irq;
 		}
-		vk->tty[i].irq_enabled = true;
+		bcm_vk_tty_set_irq_enabled(vk, i);
 	}
 
 	id = ida_simple_get(&bcm_vk_ida, 0, 0, GFP_KERNEL);
···
 
 	cancel_work_sync(&vk->wq_work);
 	destroy_workqueue(vk->wq_thread);
-	cancel_work_sync(&vk->tty_wq_work);
-	destroy_workqueue(vk->tty_wq_thread);
+	bcm_vk_tty_wq_exit(vk);
 
 	for (i = 0; i < MAX_BAR; i++) {
 		if (vk->bar[i])

drivers/misc/bcm-vk/bcm_vk_tty.c

···
 			kill_pid(find_vpid(vktty->pid), SIGKILL, 1);
 	}
 }
+
+void bcm_vk_tty_wq_exit(struct bcm_vk *vk)
+{
+	cancel_work_sync(&vk->tty_wq_work);
+	destroy_workqueue(vk->tty_wq_thread);
+}