diff options
Diffstat (limited to 'meta-quanta/meta-gbs/recipes-kernel/linux/linux-nuvoton/0004-ben-drivers-misc-Character-device-driver-for-seven-segme.patch')
| -rw-r--r-- | meta-quanta/meta-gbs/recipes-kernel/linux/linux-nuvoton/0004-ben-drivers-misc-Character-device-driver-for-seven-segme.patch | 293 |
1 files changed, 0 insertions, 293 deletions
diff --git a/meta-quanta/meta-gbs/recipes-kernel/linux/linux-nuvoton/0004-ben-drivers-misc-Character-device-driver-for-seven-segme.patch b/meta-quanta/meta-gbs/recipes-kernel/linux/linux-nuvoton/0004-ben-drivers-misc-Character-device-driver-for-seven-segme.patch deleted file mode 100644 index 8ae624a51..000000000 --- a/meta-quanta/meta-gbs/recipes-kernel/linux/linux-nuvoton/0004-ben-drivers-misc-Character-device-driver-for-seven-segme.patch +++ /dev/null @@ -1,293 +0,0 @@ -From 2d46e81d9bbb624695bac8400a4ac41b7f116ec4 Mon Sep 17 00:00:00 2001 -From: Jaghathiswari Rankappagounder Natarajan <jaghu@google.com> -Date: Fri, 27 Jul 2018 12:34:54 -0700 -Subject: [PATCH 2/3] drivers: misc: Character device driver for seven segment - display - -Character device driver which implements the user-space -API for letting a user write to two 7-segment displays including -any conversion methods necessary to map the user input -to two 7-segment displays. - -Signed-off-by: Jaghathiswari Rankappagounder Natarajan <jaghu@google.com> -Signed-off-by: Kun Yi <kunyi@google.com> -Signed-off-by: Benjamin Fair <benjaminfair@google.com> ---- - drivers/misc/Kconfig | 8 ++ - drivers/misc/Makefile | 1 + - drivers/misc/seven_seg_disp.c | 201 ++++++++++++++++++++++++++++++++++ - drivers/misc/seven_seg_disp.h | 34 ++++++ - 4 files changed, 244 insertions(+) - create mode 100644 drivers/misc/seven_seg_disp.c - create mode 100644 drivers/misc/seven_seg_disp.h - -diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig -index 9d96469fb41c..d443de886346 100644 ---- a/drivers/misc/Kconfig -+++ b/drivers/misc/Kconfig -@@ -473,6 +473,14 @@ config VEXPRESS_SYSCFG - bus. System Configuration interface is one of the possible means - of generating transactions on this bus. - -+config SEVEN_SEGMENT_DISPLAY -+ tristate "Character driver for seven segment display support" -+ help -+ Character device driver which implements the user-space -+ API for letting a user write to two 7-segment displays including -+ any conversion methods necessary to map the user input -+ to two 7-segment displays. -+ - config PCI_ENDPOINT_TEST - depends on PCI - select CRC32 - -diff --git a/drivers/misc/seven_seg_disp.c b/drivers/misc/seven_seg_disp.c -new file mode 100644 -index 000000000000..db1c571f68e5 ---- /dev/null -+++ b/drivers/misc/seven_seg_disp.c -@@ -0,0 +1,201 @@ -+/* -+ * Copyright (c) 2016 Google, Inc -+ * -+ * This program is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License version 2 or later as -+ * published by the Free Software Foundation. -+ */ -+ -+#include <linux/module.h> -+#include <linux/version.h> -+#include <linux/kernel.h> -+#include <linux/types.h> -+#include <linux/kdev_t.h> -+#include <linux/fs.h> -+#include <linux/uaccess.h> -+#include <linux/ctype.h> -+#include <linux/of.h> -+#include <linux/io.h> -+#include <linux/slab.h> -+#include <linux/platform_device.h> -+ -+#include "seven_seg_disp.h" -+ -+#define LED_DOT 0x01 -+ -+/* -+ * 0 1 2 3 4 5 6 7 8 9 A B C D E F -+ * _ _ _ _ _ _ _ _ _ _ _ _ -+ * | | | _| _| |_| |_ |_ | |_| |_| |_| |_ | _| |_ |_ -+ * |_| | |_ _| | _| |_| | |_| | | | |_| |_ |_| |_ | -+ * -+ * data[7:1] = led[a:g] -+ */ -+const u8 seven_seg_bits[] = { -+ 0xFC, 0x60, 0xDA, 0xF2, 0x66, 0xB6, 0xBE, 0xE0, -+ 0xFE, 0xF6, 0xEE, 0x3E, 0x9C, 0x7A, 0x9E, 0x8E -+ }; -+ -+/* -+ * 0 1 2 3 4 5 6 7 8 9 A B C D E F -+ * _ _ _ _ _ -+ * | |_ |_| |_ _ _ _ _ _ _ _ |_ _| _| | | -+ * |_ |_ | | _| |_| |_| | | -+ * -+ * data[7:1] = led[a:g] -+ */ -+const u8 special_seven_seg_bits[] = { -+ 0x00, 0x9C, 0x1E, 0xCE, 0x8E, 0x02, 0x02, 0x02, -+ 0x02, 0x02, 0x02, 0x02, 0xB6, 0x7A, 0x7A, 0xEC -+ }; -+ -+static dev_t seven_seg_devno; -+static struct class *seven_seg_disp_class; -+ -+static int seven_seg_disp_open(struct inode *inode, struct file *filp) -+{ -+ struct seven_seg_disp_dev *disp_dev; -+ -+ disp_dev = container_of(inode->i_cdev, -+ struct seven_seg_disp_dev, cdev); -+ filp->private_data = disp_dev; -+ return 0; -+} -+ -+static int seven_seg_disp_close(struct inode *inode, struct file *filp) -+{ -+ filp->private_data = NULL; -+ return 0; -+} -+ -+static ssize_t seven_seg_disp_read(struct file *filp, char __user *buf, size_t -+ len, loff_t *off) -+{ -+ struct seven_seg_disp_dev *disp_dev = filp->private_data; -+ -+ if (disp_dev->disp_data_valid) -+ return -EINVAL; -+ -+ if (copy_to_user(buf, disp_dev->seven_seg_disp_data_array, -+ MAX_DISP_CHAR_SIZE) != 0) { -+ return -EFAULT; -+ } -+ -+ return 0; -+} -+ -+static u16 convert_to_disp_data(char *buf) -+{ -+ u8 low_display; -+ u8 high_display; -+ u16 led_value; -+ -+ low_display = seven_seg_bits[hex_to_bin(buf[2])]; -+ -+ high_display = (buf[0] == '1') ? -+ special_seven_seg_bits[hex_to_bin(buf[1])] : -+ seven_seg_bits[hex_to_bin(buf[1])]; -+ -+ led_value = low_display | (high_display << 8); -+ if (buf[0] == '1') -+ led_value |= LED_DOT | (LED_DOT << 8); -+ -+ return led_value; -+} -+ -+static ssize_t seven_seg_disp_write(struct file *filp, const char __user *buf, -+ size_t len, loff_t *off) -+{ -+ int length = len - 1; -+ int i; -+ -+ struct seven_seg_disp_dev *disp_dev = filp->private_data; -+ -+ if (length != MAX_DISP_CHAR_SIZE) -+ return -EINVAL; -+ -+ if (copy_from_user(disp_dev->seven_seg_disp_data_array, -+ buf, length) != 0) { -+ return -EFAULT; -+ } -+ -+ for (i = 0; i < MAX_DISP_CHAR_SIZE; i++) { -+ if (!isxdigit(disp_dev->seven_seg_disp_data_array[i])) -+ return -EINVAL; -+ } -+ -+ disp_dev->current_seven_seg_disp_data = convert_to_disp_data( -+ disp_dev->seven_seg_disp_data_array); -+ disp_dev->disp_data_valid = true; -+ disp_dev->update_seven_seg_data(&disp_dev->parent, -+ disp_dev->current_seven_seg_disp_data); -+ -+ return len; -+} -+ -+static const struct file_operations seven_seg_disp_fops = { -+ -+ .owner = THIS_MODULE, -+ .open = seven_seg_disp_open, -+ .release = seven_seg_disp_close, -+ .read = seven_seg_disp_read, -+ .write = seven_seg_disp_write -+}; -+ -+void seven_seg_rem_cdev(struct seven_seg_disp_dev *disp_dev) -+{ -+ cdev_del(&disp_dev->cdev); -+ device_destroy(seven_seg_disp_class, seven_seg_devno); -+} -+ -+int seven_seg_setup_cdev(struct seven_seg_disp_dev *disp_dev, -+ void (*update_disp_data)(struct device *, u16 data)) -+{ -+ struct device *dev; -+ int err; -+ -+ dev = device_create(seven_seg_disp_class, NULL, -+ seven_seg_devno, -+ NULL, "seven_seg_disp_val"); -+ if (dev == NULL) -+ return -EIO; -+ disp_dev->dev = dev; -+ disp_dev->update_seven_seg_data = update_disp_data; -+ disp_dev->disp_data_valid = false; -+ -+ cdev_init(&disp_dev->cdev, &seven_seg_disp_fops); -+ err = cdev_add(&disp_dev->cdev, seven_seg_devno, 1); -+ if (err) -+ device_destroy(seven_seg_disp_class, seven_seg_devno); -+ return err; -+} -+ -+static int __init seven_seg_disp_init(void) -+{ -+ int err = alloc_chrdev_region(&seven_seg_devno, 0, 1, "disp_state"); -+ -+ if (err < 0) -+ return err; -+ -+ seven_seg_disp_class = class_create(THIS_MODULE, "disp_state"); -+ if (seven_seg_disp_class == NULL) -+ goto unreg_chrdev; -+ -+ return 0; -+ -+unreg_chrdev: -+ unregister_chrdev_region(seven_seg_devno, 1); -+ return -EIO; -+} -+ -+static void __exit seven_seg_disp_exit(void) -+{ -+ class_destroy(seven_seg_disp_class); -+ unregister_chrdev_region(seven_seg_devno, 1); -+} -+ -+module_init(seven_seg_disp_init); -+module_exit(seven_seg_disp_exit); -+MODULE_LICENSE("GPL"); -+MODULE_AUTHOR("Jaghathiswari Rankappagounder Natarajan <jaghu@google.com>"); -+MODULE_DESCRIPTION("Seven segment display character driver"); -diff --git a/drivers/misc/seven_seg_disp.h b/drivers/misc/seven_seg_disp.h -new file mode 100644 -index 000000000000..0ebed0802747 ---- /dev/null -+++ b/drivers/misc/seven_seg_disp.h -@@ -0,0 +1,34 @@ -+/* -+ * Copyright (c) 2016 Google, Inc -+ * -+ * This program is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License version 2 or later as -+ * published by the Free Software Foundation. -+ */ -+ -+#ifndef SEVEN_SEG_DISP_H -+#define SEVEN_SEG_DISP_H -+ -+#include <linux/device.h> -+#include <linux/cdev.h> -+ -+#define MAX_DISP_CHAR_SIZE 3 -+ -+#define DEFAULT_REFRESH_INTERVAL_MS 600 -+ -+struct seven_seg_disp_dev { -+ bool disp_data_valid; -+ u16 current_seven_seg_disp_data; -+ char seven_seg_disp_data_array[MAX_DISP_CHAR_SIZE]; -+ struct device parent; -+ struct device *dev; -+ struct cdev cdev; -+ void (*update_seven_seg_data)(struct device *, u16 data); -+}; -+ -+int seven_seg_setup_cdev(struct seven_seg_disp_dev *disp_dev, -+ void (*update_disp_data)(struct device *, u16 data)); -+ -+void seven_seg_rem_cdev(struct seven_seg_disp_dev *disp_dev); -+ -+#endif --- -2.22.0.770.g0f2c4a37fd-goog - |