+From 910b89499e2db97931afa64b0db1b7d7640af3db Mon Sep 17 00:00:00 2001
+From: Phil Elwell <pelwell@users.noreply.github.com>
+Date: Tue, 14 Jul 2015 14:32:47 +0100
+Subject: [PATCH 122/148] Merge pull request #1043 from XECDesign/sense-4.0
+
+mfd: Add Raspberry Pi Sense HAT core driver
+---
+ arch/arm/boot/dts/overlays/Makefile | 1 +
+ arch/arm/boot/dts/overlays/README | 6 +
+ arch/arm/boot/dts/overlays/rpi-sense-overlay.dts | 47 +++++
+ arch/arm/configs/bcm2709_defconfig | 2 +
+ arch/arm/configs/bcmrpi_defconfig | 2 +
+ drivers/input/joystick/Kconfig | 8 +
+ drivers/input/joystick/Makefile | 1 +
+ drivers/input/joystick/rpisense-js.c | 153 +++++++++++++++
+ drivers/mfd/Kconfig | 8 +
+ drivers/mfd/Makefile | 2 +
+ drivers/mfd/rpisense-core.c | 157 +++++++++++++++
+ drivers/video/fbdev/Kconfig | 13 ++
+ drivers/video/fbdev/Makefile | 1 +
+ drivers/video/fbdev/rpisense-fb.c | 235 +++++++++++++++++++++++
+ include/linux/mfd/rpisense/core.h | 47 +++++
+ include/linux/mfd/rpisense/framebuffer.h | 28 +++
+ include/linux/mfd/rpisense/joystick.h | 35 ++++
+ 17 files changed, 746 insertions(+)
+ create mode 100644 arch/arm/boot/dts/overlays/rpi-sense-overlay.dts
+ create mode 100644 drivers/input/joystick/rpisense-js.c
+ create mode 100644 drivers/mfd/rpisense-core.c
+ create mode 100644 drivers/video/fbdev/rpisense-fb.c
+ create mode 100644 include/linux/mfd/rpisense/core.h
+ create mode 100644 include/linux/mfd/rpisense/framebuffer.h
+ create mode 100644 include/linux/mfd/rpisense/joystick.h
+
+--- a/arch/arm/boot/dts/overlays/Makefile
++++ b/arch/arm/boot/dts/overlays/Makefile
+@@ -39,6 +39,7 @@ dtb-$(RPI_DT_OVERLAYS) += rpi-dac-overla
+ dtb-$(RPI_DT_OVERLAYS) += rpi-display-overlay.dtb
+ dtb-$(RPI_DT_OVERLAYS) += rpi-ft5406-overlay.dtb
+ dtb-$(RPI_DT_OVERLAYS) += rpi-proto-overlay.dtb
++dtb-$(RPI_DT_OVERLAYS) += rpi-sense-overlay.dtb
+ dtb-$(RPI_DT_OVERLAYS) += sdhost-overlay.dtb
+ dtb-$(RPI_DT_OVERLAYS) += spi-bcm2708-overlay.dtb
+ dtb-$(RPI_DT_OVERLAYS) += spi-bcm2835-overlay.dtb
+--- a/arch/arm/boot/dts/overlays/README
++++ b/arch/arm/boot/dts/overlays/README
+@@ -442,6 +442,12 @@ Load: dtoverlay=rpi-proto
+ Params: <None>
+
+
++Name: rpi-sense
++Info: Raspberry Pi Sense HAT
++Load: dtoverlay=rpi-sense
++Params: <None>
++
++
+ Name: sdhost
+ Info: Selects the bcm2835-sdhost SD/MMC driver, optionally with overclock
+ Load: dtoverlay=sdhost,<param>=<val>
+--- /dev/null
++++ b/arch/arm/boot/dts/overlays/rpi-sense-overlay.dts
+@@ -0,0 +1,47 @@
++// rpi-sense HAT
++/dts-v1/;
++/plugin/;
++
++/ {
++ compatible = "brcm,bcm2708", "brcm,bcm2709";
++
++ fragment@0 {
++ target = <&i2c1>;
++ __overlay__ {
++ #address-cells = <1>;
++ #size-cells = <0>;
++ status = "okay";
++
++ rpi-sense@46 {
++ compatible = "rpi,rpi-sense";
++ reg = <0x46>;
++ keys-int-gpios = <&gpio 23 1>;
++ status = "okay";
++ };
++
++ lsm9ds1-magn@1c {
++ compatible = "st,lsm9ds1-magn";
++ reg = <0x1c>;
++ status = "okay";
++ };
++
++ lsm9ds1-accel6a {
++ compatible = "st,lsm9ds1-accel";
++ reg = <0x6a>;
++ status = "okay";
++ };
++
++ lps25h-press@5c {
++ compatible = "st,lps25h-press";
++ reg = <0x5c>;
++ status = "okay";
++ };
++
++ hts221-humid@5f {
++ compatible = "st,hts221-humid";
++ reg = <0x5f>;
++ status = "okay";
++ };
++ };
++ };
++};
+--- a/arch/arm/configs/bcm2709_defconfig
++++ b/arch/arm/configs/bcm2709_defconfig
+@@ -533,6 +533,7 @@ CONFIG_JOYSTICK_IFORCE=m
+ CONFIG_JOYSTICK_IFORCE_USB=y
+ CONFIG_JOYSTICK_XPAD=m
+ CONFIG_JOYSTICK_XPAD_FF=y
++CONFIG_JOYSTICK_RPISENSE=m
+ CONFIG_INPUT_TOUCHSCREEN=y
+ CONFIG_TOUCHSCREEN_ADS7846=m
+ CONFIG_TOUCHSCREEN_EGALAX=m
+@@ -789,6 +790,7 @@ CONFIG_VIDEO_MT9V011=m
+ CONFIG_FB=y
+ CONFIG_FB_BCM2708=y
+ CONFIG_FB_SSD1307=m
++CONFIG_FB_RPISENSE=m
+ # CONFIG_BACKLIGHT_GENERIC is not set
+ CONFIG_BACKLIGHT_GPIO=m
+ CONFIG_FRAMEBUFFER_CONSOLE=y
+--- a/arch/arm/configs/bcmrpi_defconfig
++++ b/arch/arm/configs/bcmrpi_defconfig
+@@ -526,6 +526,7 @@ CONFIG_JOYSTICK_IFORCE=m
+ CONFIG_JOYSTICK_IFORCE_USB=y
+ CONFIG_JOYSTICK_XPAD=m
+ CONFIG_JOYSTICK_XPAD_FF=y
++CONFIG_JOYSTICK_RPISENSE=m
+ CONFIG_INPUT_TOUCHSCREEN=y
+ CONFIG_TOUCHSCREEN_ADS7846=m
+ CONFIG_TOUCHSCREEN_EGALAX=m
+@@ -782,6 +783,7 @@ CONFIG_VIDEO_MT9V011=m
+ CONFIG_FB=y
+ CONFIG_FB_BCM2708=y
+ CONFIG_FB_SSD1307=m
++CONFIG_FB_RPISENSE=m
+ # CONFIG_BACKLIGHT_GENERIC is not set
+ CONFIG_BACKLIGHT_GPIO=m
+ CONFIG_FRAMEBUFFER_CONSOLE=y
+--- a/drivers/input/joystick/Kconfig
++++ b/drivers/input/joystick/Kconfig
+@@ -329,4 +329,12 @@ config JOYSTICK_MAPLE
+ To compile this as a module choose M here: the module will be called
+ maplecontrol.
+
++config JOYSTICK_RPISENSE
++ tristate "Raspberry Pi Sense HAT joystick"
++ depends on GPIOLIB && INPUT
++ select MFD_RPISENSE_CORE
++
++ help
++ This is the joystick driver for the Raspberry Pi Sense HAT
++
+ endif
+--- a/drivers/input/joystick/Makefile
++++ b/drivers/input/joystick/Makefile
+@@ -32,4 +32,5 @@ obj-$(CONFIG_JOYSTICK_WARRIOR) += warri
+ obj-$(CONFIG_JOYSTICK_XPAD) += xpad.o
+ obj-$(CONFIG_JOYSTICK_ZHENHUA) += zhenhua.o
+ obj-$(CONFIG_JOYSTICK_WALKERA0701) += walkera0701.o
++obj-$(CONFIG_JOYSTICK_RPISENSE) += rpisense-js.o
+
+--- /dev/null
++++ b/drivers/input/joystick/rpisense-js.c
+@@ -0,0 +1,153 @@
++/*
++ * Raspberry Pi Sense HAT joystick driver
++ * http://raspberrypi.org
++ *
++ * Copyright (C) 2015 Raspberry Pi
++ *
++ * Author: Serge Schneider
++ *
++ * This program is free software; you can redistribute it and/or modify it
++ * under the terms of the GNU General Public License as published by the
++ * Free Software Foundation; either version 2 of the License, or (at your
++ * option) any later version.
++ *
++ */
++
++#include <linux/module.h>
++
++#include <linux/mfd/rpisense/joystick.h>
++#include <linux/mfd/rpisense/core.h>
++
++struct rpisense *rpisense;
++unsigned char keymap[5] = {KEY_DOWN, KEY_RIGHT, KEY_UP, KEY_ENTER, KEY_LEFT,};
++
++static void keys_work_fn(struct work_struct *work)
++{
++ int i;
++ static s32 prev_keys;
++ struct rpisense_js *rpisense_js = &rpisense->joystick;
++ s32 keys = rpisense_reg_read(rpisense, RPISENSE_KEYS);
++ s32 changes = keys ^ prev_keys;
++
++ prev_keys = keys;
++ for (i = 0; i < 5; i++) {
++ if (changes & 1) {
++ input_report_key(rpisense_js->keys_dev,
++ keymap[i], keys & 1);
++ }
++ changes >>= 1;
++ keys >>= 1;
++ }
++ input_sync(rpisense_js->keys_dev);
++}
++
++static irqreturn_t keys_irq_handler(int irq, void *pdev)
++{
++ struct rpisense_js *rpisense_js = &rpisense->joystick;
++
++ schedule_work(&rpisense_js->keys_work_s);
++ return IRQ_HANDLED;
++}
++
++static int rpisense_js_probe(struct platform_device *pdev)
++{
++ int ret;
++ int i;
++ struct rpisense_js *rpisense_js;
++
++ rpisense = rpisense_get_dev();
++ rpisense_js = &rpisense->joystick;
++
++ INIT_WORK(&rpisense_js->keys_work_s, keys_work_fn);
++
++ rpisense_js->keys_dev = input_allocate_device();
++ if (!rpisense_js->keys_dev) {
++ dev_err(&pdev->dev, "Could not allocate input device.\n");
++ return -ENOMEM;
++ }
++
++ rpisense_js->keys_dev->evbit[0] = BIT_MASK(EV_KEY);
++ for (i = 0; i < ARRAY_SIZE(keymap); i++) {
++ set_bit(keymap[i],
++ rpisense_js->keys_dev->keybit);
++ }
++
++ rpisense_js->keys_dev->name = "Raspberry Pi Sense HAT Joystick";
++ rpisense_js->keys_dev->phys = "rpi-sense-joy/input0";
++ rpisense_js->keys_dev->id.bustype = BUS_I2C;
++ rpisense_js->keys_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
++ rpisense_js->keys_dev->keycode = keymap;
++ rpisense_js->keys_dev->keycodesize = sizeof(unsigned char);
++ rpisense_js->keys_dev->keycodemax = ARRAY_SIZE(keymap);
++
++ ret = input_register_device(rpisense_js->keys_dev);
++ if (ret) {
++ dev_err(&pdev->dev, "Could not register input device.\n");
++ goto err_keys_alloc;
++ }
++
++ ret = gpiod_direction_input(rpisense_js->keys_desc);
++ if (ret) {
++ dev_err(&pdev->dev, "Could not set keys-int direction.\n");
++ goto err_keys_reg;
++ }
++
++ rpisense_js->keys_irq = gpiod_to_irq(rpisense_js->keys_desc);
++ if (rpisense_js->keys_irq < 0) {
++ dev_err(&pdev->dev, "Could not determine keys-int IRQ.\n");
++ ret = rpisense_js->keys_irq;
++ goto err_keys_reg;
++ }
++
++ ret = devm_request_irq(&pdev->dev, rpisense_js->keys_irq,
++ keys_irq_handler, IRQF_TRIGGER_RISING,
++ "keys", &pdev->dev);
++ if (ret) {
++ dev_err(&pdev->dev, "IRQ request failed.\n");
++ goto err_keys_reg;
++ }
++ return 0;
++err_keys_reg:
++ input_unregister_device(rpisense_js->keys_dev);
++err_keys_alloc:
++ input_free_device(rpisense_js->keys_dev);
++ return ret;
++}
++
++static int rpisense_js_remove(struct platform_device *pdev)
++{
++ struct rpisense_js *rpisense_js = &rpisense->joystick;
++
++ input_unregister_device(rpisense_js->keys_dev);
++ input_free_device(rpisense_js->keys_dev);
++ return 0;
++}
++
++#ifdef CONFIG_OF
++static const struct of_device_id rpisense_js_id[] = {
++ { .compatible = "rpi,rpi-sense-js" },
++ { },
++};
++MODULE_DEVICE_TABLE(of, rpisense_js_id);
++#endif
++
++static struct platform_device_id rpisense_js_device_id[] = {
++ { .name = "rpi-sense-js" },
++ { },
++};
++MODULE_DEVICE_TABLE(platform, rpisense_js_device_id);
++
++static struct platform_driver rpisense_js_driver = {
++ .probe = rpisense_js_probe,
++ .remove = rpisense_js_remove,
++ .driver = {
++ .name = "rpi-sense-js",
++ .owner = THIS_MODULE,
++ },
++};
++
++module_platform_driver(rpisense_js_driver);
++
++MODULE_DESCRIPTION("Raspberry Pi Sense HAT joystick driver");
++MODULE_AUTHOR("Serge Schneider <serge@raspberrypi.org>");
++MODULE_LICENSE("GPL");
+--- a/drivers/mfd/Kconfig
++++ b/drivers/mfd/Kconfig
+@@ -10,6 +10,14 @@ config MFD_CORE
+ select IRQ_DOMAIN
+ default n
+
++config MFD_RPISENSE_CORE
++ tristate "Raspberry Pi Sense HAT core functions"
++ depends on I2C
++ select MFD_CORE
++ help
++ This is the core driver for the Raspberry Pi Sense HAT. This provides
++ the necessary functions to communicate with the hardware.
++
+ config MFD_CS5535
+ tristate "AMD CS5535 and CS5536 southbridge core functions"
+ select MFD_CORE
+--- a/drivers/mfd/Makefile
++++ b/drivers/mfd/Makefile
+@@ -185,3 +185,5 @@ obj-$(CONFIG_MFD_SKY81452) += sky81452.o
+ intel-soc-pmic-objs := intel_soc_pmic_core.o intel_soc_pmic_crc.o
+ obj-$(CONFIG_INTEL_SOC_PMIC) += intel-soc-pmic.o
+ obj-$(CONFIG_MFD_MT6397) += mt6397-core.o
++
++obj-$(CONFIG_MFD_RPISENSE_CORE) += rpisense-core.o
+--- /dev/null
++++ b/drivers/mfd/rpisense-core.c
+@@ -0,0 +1,157 @@
++/*
++ * Raspberry Pi Sense HAT core driver
++ * http://raspberrypi.org
++ *
++ * Copyright (C) 2015 Raspberry Pi
++ *
++ * Author: Serge Schneider
++ *
++ * This program is free software; you can redistribute it and/or modify it
++ * under the terms of the GNU General Public License as published by the
++ * Free Software Foundation; either version 2 of the License, or (at your
++ * option) any later version.
++ *
++ * This driver is based on wm8350 implementation.
++ */
++
++#include <linux/module.h>
++#include <linux/moduleparam.h>
++#include <linux/err.h>
++#include <linux/init.h>
++#include <linux/i2c.h>
++#include <linux/platform_device.h>
++#include <linux/mfd/rpisense/core.h>
++#include <linux/slab.h>
++
++struct rpisense *rpisense;
++
++static void rpisense_client_dev_register(struct rpisense *rpisense,
++ const char *name,
++ struct platform_device **pdev)
++{
++ int ret;
++
++ *pdev = platform_device_alloc(name, -1);
++ if (*pdev == NULL) {
++ dev_err(rpisense->dev, "Failed to allocate %s\n", name);
++ return;
++ }
++
++ (*pdev)->dev.parent = rpisense->dev;
++ platform_set_drvdata(*pdev, rpisense);
++ ret = platform_device_add(*pdev);
++ if (ret != 0) {
++ dev_err(rpisense->dev, "Failed to register %s: %d\n",
++ name, ret);
++ platform_device_put(*pdev);
++ *pdev = NULL;
++ }
++}
++
++static int rpisense_probe(struct i2c_client *i2c,
++ const struct i2c_device_id *id)
++{
++ int ret;
++ struct rpisense_js *rpisense_js;
++
++ rpisense = devm_kzalloc(&i2c->dev, sizeof(struct rpisense), GFP_KERNEL);
++ if (rpisense == NULL)
++ return -ENOMEM;
++
++ i2c_set_clientdata(i2c, rpisense);
++ rpisense->dev = &i2c->dev;
++ rpisense->i2c_client = i2c;
++
++ ret = rpisense_reg_read(rpisense, RPISENSE_WAI);
++ if (ret > 0) {
++ if (ret != 's')
++ return -EINVAL;
++ } else {
++ return ret;
++ }
++ ret = rpisense_reg_read(rpisense, RPISENSE_VER);
++ if (ret < 0)
++ return ret;
++
++ dev_info(rpisense->dev,
++ "Raspberry Pi Sense HAT firmware version %i\n", ret);
++
++ rpisense_js = &rpisense->joystick;
++ rpisense_js->keys_desc = devm_gpiod_get(&i2c->dev,
++ "keys-int", GPIOD_IN);
++ if (IS_ERR(rpisense_js->keys_desc)) {
++ dev_warn(&i2c->dev, "Failed to get keys-int descriptor.\n");
++ rpisense_js->keys_desc = gpio_to_desc(23);
++ if (rpisense_js->keys_desc == NULL) {
++ dev_err(&i2c->dev, "GPIO23 fallback failed.\n");
++ return PTR_ERR(rpisense_js->keys_desc);
++ }
++ }
++ rpisense_client_dev_register(rpisense, "rpi-sense-js",
++ &(rpisense->joystick.pdev));
++ rpisense_client_dev_register(rpisense, "rpi-sense-fb",
++ &(rpisense->framebuffer.pdev));
++
++ return 0;
++}
++
++static int rpisense_remove(struct i2c_client *i2c)
++{
++ struct rpisense *rpisense = i2c_get_clientdata(i2c);
++
++ platform_device_unregister(rpisense->joystick.pdev);
++ return 0;
++}
++
++struct rpisense *rpisense_get_dev(void)
++{
++ return rpisense;
++}
++EXPORT_SYMBOL_GPL(rpisense_get_dev);
++
++s32 rpisense_reg_read(struct rpisense *rpisense, int reg)
++{
++ int ret = i2c_smbus_read_byte_data(rpisense->i2c_client, reg);
++
++ if (ret < 0)
++ dev_err(rpisense->dev, "Read from reg %d failed\n", reg);
++ /* Due to the BCM270x I2C clock stretching bug, some values
++ * may have MSB set. Clear it to avoid incorrect values.
++ * */
++ return ret & 0x7F;
++}
++EXPORT_SYMBOL_GPL(rpisense_reg_read);
++
++int rpisense_block_write(struct rpisense *rpisense, const char *buf, int count)
++{
++ int ret = i2c_master_send(rpisense->i2c_client, buf, count);
++
++ if (ret < 0)
++ dev_err(rpisense->dev, "Block write failed\n");
++ return ret;
++}
++EXPORT_SYMBOL_GPL(rpisense_block_write);
++
++static const struct i2c_device_id rpisense_i2c_id[] = {
++ { "rpi-sense", 0 },
++ { }
++};
++MODULE_DEVICE_TABLE(i2c, rpisense_i2c_id);
++
++
++static struct i2c_driver rpisense_driver = {
++ .driver = {
++ .name = "rpi-sense",
++ .owner = THIS_MODULE,
++ },
++ .probe = rpisense_probe,
++ .remove = rpisense_remove,
++ .id_table = rpisense_i2c_id,
++};
++
++module_i2c_driver(rpisense_driver);
++
++MODULE_DESCRIPTION("Raspberry Pi Sense HAT core driver");
++MODULE_AUTHOR("Serge Schneider <serge@raspberrypi.org>");
++MODULE_LICENSE("GPL");
++
+--- a/drivers/video/fbdev/Kconfig
++++ b/drivers/video/fbdev/Kconfig
+@@ -2495,3 +2495,16 @@ config FB_SSD1307
+ help
+ This driver implements support for the Solomon SSD1307
+ OLED controller over I2C.
++
++config FB_RPISENSE
++ tristate "Raspberry Pi Sense HAT framebuffer"
++ depends on FB
++ select MFD_RPISENSE_CORE
++ select FB_SYS_FOPS
++ select FB_SYS_FILLRECT
++ select FB_SYS_COPYAREA
++ select FB_SYS_IMAGEBLIT
++ select FB_DEFERRED_IO
++
++ help
++ This is the framebuffer driver for the Raspberry Pi Sense HAT
+--- a/drivers/video/fbdev/Makefile
++++ b/drivers/video/fbdev/Makefile
+@@ -150,6 +150,7 @@ obj-$(CONFIG_FB_DA8XX) += da8xx-fb.o
+ obj-$(CONFIG_FB_MXS) += mxsfb.o
+ obj-$(CONFIG_FB_SSD1307) += ssd1307fb.o
+ obj-$(CONFIG_FB_SIMPLE) += simplefb.o
++obj-$(CONFIG_FB_RPISENSE) += rpisense-fb.o
+
+ # the test framebuffer is last
+ obj-$(CONFIG_FB_VIRTUAL) += vfb.o
+--- /dev/null
++++ b/drivers/video/fbdev/rpisense-fb.c
+@@ -0,0 +1,235 @@
++/*
++ * Raspberry Pi Sense HAT framebuffer driver
++ * http://raspberrypi.org
++ *
++ * Copyright (C) 2015 Raspberry Pi
++ *
++ * Author: Serge Schneider
++ *
++ * This program is free software; you can redistribute it and/or modify it
++ * under the terms of the GNU General Public License as published by the
++ * Free Software Foundation; either version 2 of the License, or (at your
++ * option) any later version.
++ *
++ */
++
++#include <linux/module.h>
++#include <linux/kernel.h>
++#include <linux/errno.h>
++#include <linux/string.h>
++#include <linux/mm.h>
++#include <linux/slab.h>
++#include <linux/delay.h>
++#include <linux/fb.h>
++#include <linux/init.h>
++
++#include <linux/mfd/rpisense/framebuffer.h>
++#include <linux/mfd/rpisense/core.h>
++
++struct rpisense *rpisense;
++
++struct rpisense_fb_param {
++ char __iomem *vmem;
++ u8 *vmem_work;
++ u32 vmemsize;
++ u8 gamma[32];
++};
++
++static struct rpisense_fb_param rpisense_fb_param = {
++ .vmem = NULL,
++ .vmemsize = 128,
++ .gamma = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x01,
++ 0x02, 0x02, 0x03, 0x03, 0x04, 0x05, 0x06, 0x07,
++ 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0E, 0x0F, 0x11,
++ 0x12, 0x14, 0x15, 0x17, 0x19, 0x1B, 0x1D, 0x1F,},
++};
++
++static struct fb_deferred_io rpisense_fb_defio;
++
++static struct fb_fix_screeninfo rpisense_fb_fix = {
++ .id = "RPi-Sense FB",
++ .type = FB_TYPE_PACKED_PIXELS,
++ .visual = FB_VISUAL_TRUECOLOR,
++ .xpanstep = 0,
++ .ypanstep = 0,
++ .ywrapstep = 0,
++ .accel = FB_ACCEL_NONE,
++ .line_length = 16,
++};
++
++static struct fb_var_screeninfo rpisense_fb_var = {
++ .xres = 8,
++ .yres = 8,
++ .xres_virtual = 8,
++ .yres_virtual = 8,
++ .bits_per_pixel = 16,
++ .red = {11, 5, 0},
++ .green = {5, 6, 0},
++ .blue = {0, 5, 0},
++};
++
++static ssize_t rpisense_fb_write(struct fb_info *info,
++ const char __user *buf, size_t count,
++ loff_t *ppos)
++{
++ ssize_t res = fb_sys_write(info, buf, count, ppos);
++
++ schedule_delayed_work(&info->deferred_work, rpisense_fb_defio.delay);
++ return res;
++}
++
++static void rpisense_fb_fillrect(struct fb_info *info,
++ const struct fb_fillrect *rect)
++{
++ sys_fillrect(info, rect);
++ schedule_delayed_work(&info->deferred_work, rpisense_fb_defio.delay);
++}
++
++static void rpisense_fb_copyarea(struct fb_info *info,
++ const struct fb_copyarea *area)
++{
++ sys_copyarea(info, area);
++ schedule_delayed_work(&info->deferred_work, rpisense_fb_defio.delay);
++}
++
++static void rpisense_fb_imageblit(struct fb_info *info,
++ const struct fb_image *image)
++{
++ sys_imageblit(info, image);
++ schedule_delayed_work(&info->deferred_work, rpisense_fb_defio.delay);
++}
++
++static void rpisense_fb_deferred_io(struct fb_info *info,
++ struct list_head *pagelist)
++{
++ int i;
++ int j;
++ u8 *vmem_work = rpisense_fb_param.vmem_work;
++ u16 *mem = (u16 *)rpisense_fb_param.vmem;
++ u8 *gamma = rpisense_fb_param.gamma;
++
++ vmem_work[0] = 0;
++ for (j = 0; j < 8; j++) {
++ for (i = 0; i < 8; i++) {
++ vmem_work[(j * 24) + i + 1] =
++ gamma[(mem[(j * 8) + i] >> 11) & 0x1F];
++ vmem_work[(j * 24) + (i + 8) + 1] =
++ gamma[(mem[(j * 8) + i] >> 6) & 0x1F];
++ vmem_work[(j * 24) + (i + 16) + 1] =
++ gamma[(mem[(j * 8) + i]) & 0x1F];
++ }
++ }
++ rpisense_block_write(rpisense, vmem_work, 193);
++}
++
++static struct fb_deferred_io rpisense_fb_defio = {
++ .delay = HZ/100,
++ .deferred_io = rpisense_fb_deferred_io,
++};
++
++static struct fb_ops rpisense_fb_ops = {
++ .owner = THIS_MODULE,
++ .fb_read = fb_sys_read,
++ .fb_write = rpisense_fb_write,
++ .fb_fillrect = rpisense_fb_fillrect,
++ .fb_copyarea = rpisense_fb_copyarea,
++ .fb_imageblit = rpisense_fb_imageblit,
++};
++
++static int rpisense_fb_probe(struct platform_device *pdev)
++{
++ struct fb_info *info;
++ int ret = -ENOMEM;
++ struct rpisense_fb *rpisense_fb;
++
++ rpisense = rpisense_get_dev();
++ rpisense_fb = &rpisense->framebuffer;
++
++ rpisense_fb_param.vmem = vzalloc(rpisense_fb_param.vmemsize);
++ if (!rpisense_fb_param.vmem)
++ return ret;
++
++ rpisense_fb_param.vmem_work = devm_kmalloc(&pdev->dev, 193, GFP_KERNEL);
++ if (!rpisense_fb_param.vmem_work)
++ goto err_malloc;
++
++ info = framebuffer_alloc(0, &pdev->dev);
++ if (!info) {
++ dev_err(&pdev->dev, "Could not allocate framebuffer.\n");
++ goto err_malloc;
++ }
++ rpisense_fb->info = info;
++
++ rpisense_fb_fix.smem_start = (unsigned long)rpisense_fb_param.vmem;
++ rpisense_fb_fix.smem_len = rpisense_fb_param.vmemsize;
++
++ info->fbops = &rpisense_fb_ops;
++ info->fix = rpisense_fb_fix;
++ info->var = rpisense_fb_var;
++ info->fbdefio = &rpisense_fb_defio;
++ info->flags = FBINFO_FLAG_DEFAULT | FBINFO_VIRTFB;
++ info->screen_base = rpisense_fb_param.vmem;
++ info->screen_size = rpisense_fb_param.vmemsize;
++
++ fb_deferred_io_init(info);
++
++ ret = register_framebuffer(info);
++ if (ret < 0) {
++ dev_err(&pdev->dev, "Could not register framebuffer.\n");
++ goto err_fballoc;
++ }
++
++ fb_info(info, "%s frame buffer device\n", info->fix.id);
++ schedule_delayed_work(&info->deferred_work, rpisense_fb_defio.delay);
++ return 0;
++err_fballoc:
++ framebuffer_release(info);
++err_malloc:
++ vfree(rpisense_fb_param.vmem);
++ return ret;
++}
++
++static int rpisense_fb_remove(struct platform_device *pdev)
++{
++ struct rpisense_fb *rpisense_fb = &rpisense->framebuffer;
++ struct fb_info *info = rpisense_fb->info;
++
++ if (info) {
++ unregister_framebuffer(info);
++ fb_deferred_io_cleanup(info);
++ framebuffer_release(info);
++ vfree(rpisense_fb_param.vmem);
++ }
++
++ return 0;
++}
++
++#ifdef CONFIG_OF
++static const struct of_device_id rpisense_fb_id[] = {
++ { .compatible = "rpi,rpi-sense-fb" },
++ { },
++};
++MODULE_DEVICE_TABLE(of, rpisense_fb_id);
++#endif
++
++static struct platform_device_id rpisense_fb_device_id[] = {
++ { .name = "rpi-sense-fb" },
++ { },
++};
++MODULE_DEVICE_TABLE(platform, rpisense_fb_device_id);
++
++static struct platform_driver rpisense_fb_driver = {
++ .probe = rpisense_fb_probe,
++ .remove = rpisense_fb_remove,
++ .driver = {
++ .name = "rpi-sense-fb",
++ .owner = THIS_MODULE,
++ },
++};
++
++module_platform_driver(rpisense_fb_driver);
++
++MODULE_DESCRIPTION("Raspberry Pi Sense HAT framebuffer driver");
++MODULE_AUTHOR("Serge Schneider <serge@raspberrypi.org>");
++MODULE_LICENSE("GPL");
++
+--- /dev/null
++++ b/include/linux/mfd/rpisense/core.h
+@@ -0,0 +1,47 @@
++/*
++ * Raspberry Pi Sense HAT core driver
++ * http://raspberrypi.org
++ *
++ * Copyright (C) 2015 Raspberry Pi
++ *
++ * Author: Serge Schneider
++ *
++ * This program is free software; you can redistribute it and/or modify it
++ * under the terms of the GNU General Public License as published by the
++ * Free Software Foundation; either version 2 of the License, or (at your
++ * option) any later version.
++ *
++ */
++
++#ifndef __LINUX_MFD_RPISENSE_CORE_H_
++#define __LINUX_MFD_RPISENSE_CORE_H_
++
++#include <linux/mfd/rpisense/joystick.h>
++#include <linux/mfd/rpisense/framebuffer.h>
++
++/*
++ * Register values.
++ */
++#define RPISENSE_FB 0x00
++#define RPISENSE_WAI 0xF0
++#define RPISENSE_VER 0xF1
++#define RPISENSE_KEYS 0xF2
++#define RPISENSE_EE_WP 0xF3
++
++#define RPISENSE_ID 's'
++
++struct rpisense {
++ struct device *dev;
++ struct i2c_client *i2c_client;
++
++ /* Client devices */
++ struct rpisense_js joystick;
++ struct rpisense_fb framebuffer;
++};
++
++struct rpisense *rpisense_get_dev(void);
++s32 rpisense_reg_read(struct rpisense *rpisense, int reg);
++int rpisense_reg_write(struct rpisense *rpisense, int reg, u16 val);
++int rpisense_block_write(struct rpisense *rpisense, const char *buf, int count);
++
++#endif
+--- /dev/null
++++ b/include/linux/mfd/rpisense/framebuffer.h
+@@ -0,0 +1,28 @@
++/*
++ * Raspberry Pi Sense HAT framebuffer driver
++ * http://raspberrypi.org
++ *
++ * Copyright (C) 2015 Raspberry Pi
++ *
++ * Author: Serge Schneider
++ *
++ * This program is free software; you can redistribute it and/or modify it
++ * under the terms of the GNU General Public License as published by the
++ * Free Software Foundation; either version 2 of the License, or (at your
++ * option) any later version.
++ *
++ */
++
++#ifndef __LINUX_RPISENSE_FB_H_
++#define __LINUX_RPISENSE_FB_H_
++
++#include <linux/platform_device.h>
++
++struct rpisense;
++
++struct rpisense_fb {
++ struct platform_device *pdev;
++ struct fb_info *info;
++};
++
++#endif
+--- /dev/null
++++ b/include/linux/mfd/rpisense/joystick.h
+@@ -0,0 +1,35 @@
++/*
++ * Raspberry Pi Sense HAT joystick driver
++ * http://raspberrypi.org
++ *
++ * Copyright (C) 2015 Raspberry Pi
++ *
++ * Author: Serge Schneider
++ *
++ * This program is free software; you can redistribute it and/or modify it
++ * under the terms of the GNU General Public License as published by the
++ * Free Software Foundation; either version 2 of the License, or (at your
++ * option) any later version.
++ *
++ */
++
++#ifndef __LINUX_RPISENSE_JOYSTICK_H_
++#define __LINUX_RPISENSE_JOYSTICK_H_
++
++#include <linux/input.h>
++#include <linux/interrupt.h>
++#include <linux/gpio/consumer.h>
++#include <linux/platform_device.h>
++
++struct rpisense;
++
++struct rpisense_js {
++ struct platform_device *pdev;
++ struct input_dev *keys_dev;
++ struct gpio_desc *keys_desc;
++ struct work_struct keys_work_s;
++ int keys_irq;
++};
++
++
++#endif
projects / openwrt / openwrt.git / commitdiff