diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.4/0083-mfd-Add-Raspberry-Pi-Sense-HAT-core-driver.patch')
-rw-r--r-- | target/linux/brcm2708/patches-4.4/0083-mfd-Add-Raspberry-Pi-Sense-HAT-core-driver.patch | 838 |
1 files changed, 838 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.4/0083-mfd-Add-Raspberry-Pi-Sense-HAT-core-driver.patch b/target/linux/brcm2708/patches-4.4/0083-mfd-Add-Raspberry-Pi-Sense-HAT-core-driver.patch new file mode 100644 index 0000000000..3e3cca534b --- /dev/null +++ b/target/linux/brcm2708/patches-4.4/0083-mfd-Add-Raspberry-Pi-Sense-HAT-core-driver.patch @@ -0,0 +1,838 @@ +From 17ec32c056210154217ea601c86a16685d58f408 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 083/381] mfd: Add Raspberry Pi Sense HAT core driver + +--- + 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 | 293 +++++++++++++++++++++++++++++++ + include/linux/mfd/rpisense/core.h | 47 +++++ + include/linux/mfd/rpisense/framebuffer.h | 32 ++++ + include/linux/mfd/rpisense/joystick.h | 35 ++++ + 12 files changed, 750 insertions(+) + 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/drivers/input/joystick/Kconfig ++++ b/drivers/input/joystick/Kconfig +@@ -330,4 +330,12 @@ 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> ++ ++static struct rpisense *rpisense; ++static 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 +@@ -194,3 +194,5 @@ intel-soc-pmic-objs := intel_soc_pmic_c + intel-soc-pmic-$(CONFIG_INTEL_PMC_IPC) += intel_soc_pmic_bxtwc.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> ++ ++static 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 +@@ -2505,3 +2505,16 @@ config FB_SM712 + This driver is also available as a module. The module will be + called sm712fb. If you want to compile it as a module, say M + here and read <file:Documentation/kbuild/modules.txt>. ++ ++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 +1,293 @@ ++/* ++ * 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/uaccess.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> ++ ++static bool lowlight; ++module_param(lowlight, bool, 0); ++MODULE_PARM_DESC(lowlight, "Reduce LED matrix brightness to one third"); ++ ++static struct rpisense *rpisense; ++ ++struct rpisense_fb_param { ++ char __iomem *vmem; ++ u8 *vmem_work; ++ u32 vmemsize; ++ u8 *gamma; ++}; ++ ++static u8 gamma_default[32] = {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 u8 gamma_low[32] = {0x00, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, ++ 0x01, 0x01, 0x01, 0x01, 0x01, 0x02, 0x02, 0x02, ++ 0x03, 0x03, 0x03, 0x04, 0x04, 0x05, 0x05, 0x06, ++ 0x06, 0x07, 0x07, 0x08, 0x08, 0x09, 0x0A, 0x0A,}; ++ ++static u8 gamma_user[32]; ++ ++static struct rpisense_fb_param rpisense_fb_param = { ++ .vmem = NULL, ++ .vmemsize = 128, ++ .gamma = gamma_default, ++}; ++ ++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 int rpisense_fb_ioctl(struct fb_info *info, unsigned int cmd, ++ unsigned long arg) ++{ ++ switch (cmd) { ++ case SENSEFB_FBIOGET_GAMMA: ++ if (copy_to_user((void __user *) arg, rpisense_fb_param.gamma, ++ sizeof(u8[32]))) ++ return -EFAULT; ++ return 0; ++ case SENSEFB_FBIOSET_GAMMA: ++ if (copy_from_user(gamma_user, (void __user *)arg, ++ sizeof(u8[32]))) ++ return -EFAULT; ++ rpisense_fb_param.gamma = gamma_user; ++ schedule_delayed_work(&info->deferred_work, ++ rpisense_fb_defio.delay); ++ return 0; ++ case SENSEFB_FBIORESET_GAMMA: ++ switch (arg) { ++ case 0: ++ rpisense_fb_param.gamma = gamma_default; ++ break; ++ case 1: ++ rpisense_fb_param.gamma = gamma_low; ++ break; ++ case 2: ++ rpisense_fb_param.gamma = gamma_user; ++ break; ++ default: ++ return -EINVAL; ++ } ++ schedule_delayed_work(&info->deferred_work, ++ rpisense_fb_defio.delay); ++ break; ++ default: ++ return -EINVAL; ++ } ++ return 0; ++} ++ ++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, ++ .fb_ioctl = rpisense_fb_ioctl, ++}; ++ ++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; ++ ++ if (lowlight) ++ rpisense_fb_param.gamma = gamma_low; ++ ++ 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 +1,32 @@ ++/* ++ * 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_ ++ ++#define SENSEFB_FBIO_IOC_MAGIC 0xF1 ++ ++#define SENSEFB_FBIOGET_GAMMA _IO(SENSEFB_FBIO_IOC_MAGIC, 0) ++#define SENSEFB_FBIOSET_GAMMA _IO(SENSEFB_FBIO_IOC_MAGIC, 1) ++#define SENSEFB_FBIORESET_GAMMA _IO(SENSEFB_FBIO_IOC_MAGIC, 2) ++ ++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 |