diff options
Diffstat (limited to 'meta-quanta/meta-gbs/recipes-kernel/linux/linux-nuvoton/0004-ben-drivers-misc-Platform-driver-for-seven-segment-displ.patch')
| -rw-r--r-- | meta-quanta/meta-gbs/recipes-kernel/linux/linux-nuvoton/0004-ben-drivers-misc-Platform-driver-for-seven-segment-displ.patch | 267 |
1 files changed, 267 insertions, 0 deletions
diff --git a/meta-quanta/meta-gbs/recipes-kernel/linux/linux-nuvoton/0004-ben-drivers-misc-Platform-driver-for-seven-segment-displ.patch b/meta-quanta/meta-gbs/recipes-kernel/linux/linux-nuvoton/0004-ben-drivers-misc-Platform-driver-for-seven-segment-displ.patch new file mode 100644 index 000000000..b166c78b8 --- /dev/null +++ b/meta-quanta/meta-gbs/recipes-kernel/linux/linux-nuvoton/0004-ben-drivers-misc-Platform-driver-for-seven-segment-displ.patch @@ -0,0 +1,267 @@ +From ea3e732d2c4a609e621346a96d37713820640196 Mon Sep 17 00:00:00 2001 +From: Jaghathiswari Rankappagounder Natarajan <jaghu@google.com> +Date: Fri, 27 Jul 2018 12:36:24 -0700 +Subject: [PATCH 3/3] drivers: misc: Platform driver for seven segment display + support + +Platform device driver which provides an API for displaying on two +7-segment displays, and implements the required bit-banging. +The hardware assumed is 74HC164 wired 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 | 2 ++ + drivers/misc/seven_seg_gpio.c | 205 ++++++++++++++++++++++++++++++++++ + 3 files changed, 215 insertions(+) + create mode 100644 drivers/misc/seven_seg_gpio.c + +diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig +index d443de886346..e10984e3288f 100644 +--- a/drivers/misc/Kconfig ++++ b/drivers/misc/Kconfig +@@ -481,6 +481,14 @@ config SEVEN_SEGMENT_DISPLAY + any conversion methods necessary to map the user input + to two 7-segment displays. + ++config SEVEN_SEGMENT_GPIO ++ tristate "Platform driver to update seven segment display" ++ depends on SEVEN_SEGMENT_DISPLAY ++ help ++ Platform device driver which provides an API for displaying on two ++ 7-segment displays, and implements the required bit-banging. ++ The hardware assumed is 74HC164 wired to two 7-segment displays. ++ + config PCI_ENDPOINT_TEST + depends on PCI + select CRC32 +# diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile +# index 402bcc3c9961..f39bec664d92 100644 +# --- a/drivers/misc/Makefile +# +++ b/drivers/misc/Makefile +# @@ -53,6 +53,8 @@ obj-$(CONFIG_GENWQE) += genwqe/ +# obj-$(CONFIG_ECHO) += echo/ +# obj-$(CONFIG_VEXPRESS_SYSCFG) += vexpress-syscfg.o +# obj-$(CONFIG_CXL_BASE) += cxl/ +# +obj-$(CONFIG_SEVEN_SEGMENT_DISPLAY) += seven_seg_disp.o +# +obj-$(CONFIG_SEVEN_SEGMENT_GPIO) += seven_seg_gpio.o +# obj-$(CONFIG_ASPEED_LPC_CTRL) += aspeed-lpc-ctrl.o +# obj-$(CONFIG_ASPEED_LPC_SNOOP) += aspeed-lpc-snoop.o +# obj-$(CONFIG_ASPEED_LPC_MBOX) += aspeed-lpc-mbox.o + +diff --git a/drivers/misc/seven_seg_gpio.c b/drivers/misc/seven_seg_gpio.c +new file mode 100644 +index 000000000000..e03ea7f8b848 +--- /dev/null ++++ b/drivers/misc/seven_seg_gpio.c +@@ -0,0 +1,205 @@ ++/* ++ * 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/kernel.h> ++#include <linux/module.h> ++#include <linux/timer.h> ++#include <linux/jiffies.h> ++#include <linux/sizes.h> ++#include <linux/io.h> ++#include <linux/delay.h> ++#include <linux/uaccess.h> ++#include <linux/mutex.h> ++#include <linux/of_platform.h> ++#include <linux/gpio/consumer.h> ++ ++#include "seven_seg_disp.h" ++ ++#define DELAY_INTVL_US 1 ++ ++#define CLOCK_GPIO_NAME "clock" ++#define DATA_GPIO_NAME "data" ++#define CLEAR_GPIO_NAME "clear" ++ ++struct seven_seg_gpio_info { ++ u16 curr_disp_value; ++ u16 refresh_interval; ++ struct timer_list update_timer; ++ struct gpio_desc *clock_gpio; ++ struct gpio_desc *data_gpio; ++ struct gpio_desc *clear_gpio; ++}; ++ ++static void update_seven_seg_gpio_data(struct device *dev, u16 data) ++{ ++ struct platform_device *pdev; ++ struct seven_seg_gpio_info *gpio_info; ++ ++ pdev = container_of(dev, struct platform_device, dev); ++ if (pdev == NULL) { ++ pr_err("invalid NULL platform_device\n"); ++ return; ++ } ++ ++ gpio_info = platform_get_drvdata(pdev); ++ if (gpio_info == NULL) { ++ pr_err("invalid NULL gpio_info\n"); ++ return; ++ } ++ ++ gpio_info->curr_disp_value = data; ++} ++ ++static void clear_seven_seg_gpio_data(struct device *dev, u16 data) ++{ ++ struct platform_device *pdev; ++ struct seven_seg_gpio_info *gpio_info; ++ ++ pdev = container_of(dev, struct platform_device, dev); ++ if (pdev == NULL) { ++ pr_err("invalid NULL platform_device\n"); ++ return; ++ } ++ ++ gpio_info = platform_get_drvdata(pdev); ++ if (gpio_info == NULL) { ++ pr_err("invalid NULL gpio_info\n"); ++ return; ++ } ++ ++ gpio_info->curr_disp_value = 0; ++} ++ ++static void send_seven_seg_gpio_data(u16 disp_data, ++ struct seven_seg_gpio_info *gpio_info) ++{ ++ int i; ++ ++ gpiod_set_value(gpio_info->clear_gpio, 0); ++ udelay(DELAY_INTVL_US); ++ gpiod_set_value(gpio_info->clear_gpio, 1); ++ udelay(DELAY_INTVL_US); ++ ++ for (i = 0; i < 16; i++) { ++ if (disp_data & 0x01) ++ gpiod_set_value(gpio_info->data_gpio, 1); ++ else ++ gpiod_set_value(gpio_info->data_gpio, 0); ++ ++ udelay(DELAY_INTVL_US); ++ ++ gpiod_set_value(gpio_info->clock_gpio, 0); ++ udelay(DELAY_INTVL_US); ++ gpiod_set_value(gpio_info->clock_gpio, 1); ++ udelay(DELAY_INTVL_US); ++ ++ disp_data >>= 1; ++ } ++} ++ ++static void disp_refresh_timer_handler(struct timer_list *t) ++{ ++ u16 disp_data; ++ struct seven_seg_gpio_info *gpio_info = ++ from_timer(gpio_info, t, update_timer); ++ disp_data = gpio_info->curr_disp_value; ++ ++ send_seven_seg_gpio_data(disp_data, gpio_info); ++ mod_timer(&gpio_info->update_timer, ++ jiffies + msecs_to_jiffies(gpio_info->refresh_interval)); ++} ++ ++static const struct of_device_id of_seven_seg_gpio_match[] = { ++ { .compatible = "seven-seg-gpio-dev" }, ++ {}, ++}; ++ ++MODULE_DEVICE_TABLE(of, of_seven_seg_gpio_match); ++ ++static int seven_seg_gpio_probe(struct platform_device *pdev) ++{ ++ u16 interval; ++ int result; ++ struct seven_seg_gpio_info *gpio_info; ++ struct device *dev = &pdev->dev; ++ struct seven_seg_disp_dev *disp_dev; ++ ++ gpio_info = devm_kzalloc(dev, ++ sizeof(struct seven_seg_gpio_info), ++ GFP_KERNEL); ++ if (gpio_info == NULL) ++ return -ENOMEM; ++ ++ /* Requesting the clock gpio */ ++ gpio_info->clock_gpio = devm_gpiod_get(dev, CLOCK_GPIO_NAME, ++ GPIOD_OUT_HIGH); ++ if (IS_ERR(gpio_info->clock_gpio)) ++ return PTR_ERR(gpio_info->clock_gpio); ++ ++ /* Requesting the data gpio */ ++ gpio_info->data_gpio = devm_gpiod_get(dev, DATA_GPIO_NAME, ++ GPIOD_OUT_HIGH); ++ if (IS_ERR(gpio_info->data_gpio)) ++ return PTR_ERR(gpio_info->data_gpio); ++ ++ /* Requesting the clear gpio */ ++ gpio_info->clear_gpio = devm_gpiod_get(dev, CLEAR_GPIO_NAME, ++ GPIOD_OUT_HIGH); ++ if (IS_ERR(gpio_info->clear_gpio)) ++ return PTR_ERR(gpio_info->clear_gpio); ++ ++ result = of_property_read_u16(pdev->dev.of_node, ++ "refresh-interval-ms", &interval); ++ gpio_info->refresh_interval = result ? DEFAULT_REFRESH_INTERVAL_MS : ++ interval; ++ ++ /* Start timer to update seven segment display every second */ ++ timer_setup(&gpio_info->update_timer, disp_refresh_timer_handler, 0); ++ result = mod_timer(&gpio_info->update_timer, ++ jiffies + ++ msecs_to_jiffies(gpio_info->refresh_interval)); ++ if (result) ++ return result; ++ ++ gpio_info->curr_disp_value = 0; ++ ++ platform_set_drvdata(pdev, gpio_info); ++ ++ disp_dev = devm_kzalloc(dev, sizeof(struct seven_seg_disp_dev), ++ GFP_KERNEL); ++ disp_dev->parent = *dev; ++ seven_seg_setup_cdev(disp_dev, &update_seven_seg_gpio_data); ++ return 0; ++} ++ ++static int seven_seg_gpio_remove(struct platform_device *pdev) ++{ ++ struct seven_seg_gpio_info *gpio_info = platform_get_drvdata(pdev); ++ struct seven_seg_disp_dev *disp_dev = ++ container_of(&pdev->dev, ++ struct seven_seg_disp_dev, parent); ++ seven_seg_rem_cdev(disp_dev); ++ del_timer_sync(&gpio_info->update_timer); ++ platform_set_drvdata(pdev, NULL); ++ return 0; ++} ++ ++static struct platform_driver seven_seg_gpio_driver = { ++ .probe = seven_seg_gpio_probe, ++ .remove = seven_seg_gpio_remove, ++ .driver = { ++ .name = "seven-seg-gpio", ++ .of_match_table = of_seven_seg_gpio_match, ++ }, ++}; ++ ++module_platform_driver(seven_seg_gpio_driver); ++ ++MODULE_LICENSE("GPL"); ++MODULE_AUTHOR("Jaghathiswari Rankappagounder Natarajan <jaghu@google.com>"); ++MODULE_DESCRIPTION("Seven segment display driver using GPIO config"); +-- +2.22.0.770.g0f2c4a37fd-goog + |