| Message ID | 20181210163036.24813-2-nsaenzjulienne@suse.de (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | input: driver for RPi's official 7" touchscreen | expand |
Hi Nicolas, On Mon, Dec 10, 2018 at 05:30:20PM +0100, Nicolas Saenz Julienne wrote: > Add's support to Raspberry Pi's 7" Touch device. Instead of using a > conventional bus all information is copied into a memory mapped area by > RPi's firmware. > > Based on the driver found in RPi's kernel repository. I believe we are almost there, just a couple of nits. > > Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de> > --- > drivers/input/touchscreen/Kconfig | 12 ++ > drivers/input/touchscreen/Makefile | 1 + > drivers/input/touchscreen/raspberrypi-ts.c | 223 +++++++++++++++++++++ > 3 files changed, 236 insertions(+) > create mode 100644 drivers/input/touchscreen/raspberrypi-ts.c > > diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig > index 2a80675cfd94..a9be434de738 100644 > --- a/drivers/input/touchscreen/Kconfig > +++ b/drivers/input/touchscreen/Kconfig > @@ -696,6 +696,18 @@ config TOUCHSCREEN_EDT_FT5X06 > To compile this driver as a module, choose M here: the > module will be called edt-ft5x06. > > +config TOUCHSCREEN_RASPBERRYPI_TS > + tristate "Raspberry Pi's firmware base touch screen support" > + depends on RASPBERRYPI_FIRMWARE || COMPILE_TEST > + help > + Say Y here if you have the offitial Raspberry Pi 7' scren on your > + system. > + > + If unsure, say N. > + > + To compile this driver as a module, choose M here: the > + module will be called raspberrypi-ts. > + > config TOUCHSCREEN_MIGOR > tristate "Renesas MIGO-R touchscreen" > depends on (SH_MIGOR || COMPILE_TEST) && I2C > diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile > index 5911a4190cd2..3eccb1925e89 100644 > --- a/drivers/input/touchscreen/Makefile > +++ b/drivers/input/touchscreen/Makefile > @@ -109,3 +109,4 @@ obj-$(CONFIG_TOUCHSCREEN_ZET6223) += zet6223.o > obj-$(CONFIG_TOUCHSCREEN_ZFORCE) += zforce_ts.o > obj-$(CONFIG_TOUCHSCREEN_COLIBRI_VF50) += colibri-vf50-ts.o > obj-$(CONFIG_TOUCHSCREEN_ROHM_BU21023) += rohm_bu21023.o > +obj-$(CONFIG_TOUCHSCREEN_RASPBERRYPI_TS) += raspberrypi-ts.o > diff --git a/drivers/input/touchscreen/raspberrypi-ts.c b/drivers/input/touchscreen/raspberrypi-ts.c > new file mode 100644 > index 000000000000..edc92018687e > --- /dev/null > +++ b/drivers/input/touchscreen/raspberrypi-ts.c > @@ -0,0 +1,223 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/* > + * Raspberry Pi 3 firmware based touchscreen driver > + * > + * Copyright (C) 2015, 2017 Raspberry Pi > + * Copyright (C) 2018 Nicolas Saenz Julienne <nsaenzjulienne@suse.de> > + */ > + > +#include <linux/io.h> > +#include <linux/slab.h> > +#include <linux/module.h> > +#include <linux/bitops.h> > +#include <linux/dma-mapping.h> > +#include <linux/platform_device.h> > +#include <linux/input.h> > +#include <linux/input/mt.h> > +#include <linux/input-polldev.h> > +#include <linux/input/touchscreen.h> > +#include <soc/bcm2835/raspberrypi-firmware.h> > + > +#define RPI_TS_DEFAULT_WIDTH 800 > +#define RPI_TS_DEFAULT_HEIGHT 480 > + > +#define RPI_TS_MAX_SUPPORTED_POINTS 10 > + > +#define RPI_TS_FTS_TOUCH_DOWN 0 > +#define RPI_TS_FTS_TOUCH_CONTACT 2 > + > +#define RPI_TS_POLL_INTERVAL 17 /* 60fps */ > + > +struct rpi_ts { > + struct platform_device *pdev; > + struct input_polled_dev *poll_dev; > + struct touchscreen_properties prop; > + > + void __iomem *fw_regs_va; > + dma_addr_t fw_regs_phys; > + > + int known_ids; > +}; > + > +struct rpi_ts_regs { > + u8 device_mode; > + u8 gesture_id; > + u8 num_points; > + struct rpi_ts_touch { > + u8 xh; > + u8 xl; > + u8 yh; > + u8 yl; > + u8 pressure; /* Not supported */ > + u8 area; /* Not supported */ > + } point[RPI_TS_MAX_SUPPORTED_POINTS]; > +}; > + > +/* > + * We poll the memory based register copy of the touchscreen chip using the > + * number of points register to know whether the copy has been updated (we > + * write 99 to the memory copy, the GPU will write between 0 - 10 points) > + */ > +static void rpi_ts_poll(struct input_polled_dev *dev) > +{ > + struct input_dev *input = dev->input; > + struct rpi_ts *ts = dev->private; > + struct rpi_ts_regs regs; > + int modified_ids = 0; > + long released_ids; > + int event_type; > + int touchid; > + int x, y; > + int i; > + > + memcpy_fromio(®s, ts->fw_regs_va, sizeof(regs)); > + iowrite8(99, ts->fw_regs_va + offsetof(struct rpi_ts_regs, num_points)); > + > + if (regs.num_points == 99 || > + (regs.num_points == 0 && ts->known_ids == 0)) > + return; > + > + for (i = 0; i < regs.num_points; i++) { > + x = (((int)regs.point[i].xh & 0xf) << 8) + regs.point[i].xl; > + y = (((int)regs.point[i].yh & 0xf) << 8) + regs.point[i].yl; > + touchid = (regs.point[i].yh >> 4) & 0xf; > + event_type = (regs.point[i].xh >> 6) & 0x03; > + > + modified_ids |= BIT(touchid); > + > + if (event_type == RPI_TS_FTS_TOUCH_DOWN || > + event_type == RPI_TS_FTS_TOUCH_CONTACT) { > + input_mt_slot(input, touchid); > + input_mt_report_slot_state(input, MT_TOOL_FINGER, 1); > + touchscreen_report_pos(input, &ts->prop, x, y, true); > + } > + } > + > + released_ids = ts->known_ids & ~modified_ids; > + for_each_set_bit(i, &released_ids, RPI_TS_MAX_SUPPORTED_POINTS) { > + input_mt_slot(input, i); > + input_mt_report_slot_state(input, MT_TOOL_FINGER, 0); > + modified_ids &= ~(BIT(i)); > + } > + ts->known_ids = modified_ids; > + > + input_mt_sync_frame(input); > + input_sync(input); > +} > + > +static void rpi_ts_dma_cleanup(void *data) > +{ > + struct rpi_ts *ts = data; > + struct device *dev = &ts->pdev->dev; > + > + if(ts->fw_regs_va) Drop the condition. > + dma_free_coherent(dev, PAGE_SIZE, ts->fw_regs_va, > + ts->fw_regs_phys); > +} > + > +static int rpi_ts_probe(struct platform_device *pdev) > +{ > + struct device *dev = &pdev->dev; > + struct device_node *np = dev->of_node; > + struct input_polled_dev *poll_dev; > + struct device_node *fw_node; > + struct rpi_firmware *fw; > + struct input_dev *input; > + struct rpi_ts *ts; > + u32 touchbuf; > + int ret; > + > + fw_node = of_get_parent(np); > + if (!fw_node) { > + dev_err(dev, "Missing firmware node\n"); > + return -ENOENT; > + } > + > + fw = rpi_firmware_get(fw_node); > + of_node_put(fw_node); > + if (!fw) > + return -EPROBE_DEFER; > + > + ts = devm_kzalloc(dev, sizeof(*ts), GFP_KERNEL); > + if (!ts) { > + dev_err(dev, "Failed to allocate memory\n"); > + return -ENOMEM; > + } > + ts->pdev = pdev; > + > + ret = devm_add_action_or_reset(dev, rpi_ts_dma_cleanup, ts); > + if (ret) > + return ret; This call needs to be after dma_zalloc_coherent(). Also (my personal preference) can we please call this variable "error"? Then we can write "if (error) ...". > + > + ts->fw_regs_va = dma_zalloc_coherent(dev, PAGE_SIZE, &ts->fw_regs_phys, > + GFP_KERNEL); > + if (!ts->fw_regs_va) { > + dev_err(dev, "failed to dma_alloc_coherent\n"); > + return -ENOMEM; > + } > + > + touchbuf = (u32)ts->fw_regs_phys; > + ret = rpi_firmware_property(fw, RPI_FIRMWARE_FRAMEBUFFER_SET_TOUCHBUF, > + &touchbuf, sizeof(touchbuf)); > + > + if (ret || touchbuf != 0) { > + dev_warn(dev, "Failed to set touchbuf, trying to get err:%x\n", > + ret); > + return ret; > + } > + > + poll_dev = devm_input_allocate_polled_device(dev); > + if (!poll_dev) { > + dev_err(dev, "Failed to allocate input device\n"); > + return -ENOMEM; > + } > + ts->poll_dev = poll_dev; > + input = poll_dev->input; > + > + input->name = "raspberrypi-ts"; > + input->id.bustype = BUS_HOST; > + poll_dev->poll_interval = RPI_TS_POLL_INTERVAL; > + poll_dev->poll = rpi_ts_poll; > + poll_dev->private = ts; > + > + __set_bit(EV_SYN, input->evbit); > + __set_bit(EV_KEY, input->evbit); > + __set_bit(EV_ABS, input->evbit); No need to set these, EV_SYN is set by the input core, and KEY/ABS are by input_set_abs_params() and input_mt_init_slots(). > + > + input_set_abs_params(input, ABS_MT_POSITION_X, 0, > + RPI_TS_DEFAULT_WIDTH, 0, 0); > + input_set_abs_params(input, ABS_MT_POSITION_Y, 0, > + RPI_TS_DEFAULT_HEIGHT, 0, 0); > + touchscreen_parse_properties(input, true, &ts->prop); > + > + input_mt_init_slots(input, RPI_TS_MAX_SUPPORTED_POINTS, > + INPUT_MT_DIRECT | INPUT_MT_POINTER); Error handling here please. Also, for touchscreens you do not need to set INPUT_MT_POINTER, just INPUT_MT_DIRECT. > + > + ret = input_register_polled_device(poll_dev); > + if (ret) { > + dev_err(dev, "could not register input device, %d\n", ret); > + return ret; > + } > + > + return 0; > +} > + > +static const struct of_device_id rpi_ts_match[] = { > + { .compatible = "raspberrypi,firmware-ts", }, > + {}, > +}; > +MODULE_DEVICE_TABLE(of, rpi_ts_match); > + > +static struct platform_driver rpi_ts_driver = { > + .driver = { > + .name = "raspberrypi-ts", > + .of_match_table = rpi_ts_match, > + }, > + .probe = rpi_ts_probe, > +}; > +module_platform_driver(rpi_ts_driver); > + > +MODULE_AUTHOR("Gordon Hollingworth"); > +MODULE_AUTHOR("Nicolas Saenz Julienne <nsaenzjulienne@suse.de>"); > +MODULE_DESCRIPTION("Raspberry Pi 3 firmware based touchscreen driver"); > +MODULE_LICENSE("GPL v2"); > -- > 2.19.2 > Thanks.
Hi Nicolas, > Nicolas Saenz Julienne <nsaenzjulienne@suse.de> hat am 10. Dezember 2018 um 17:30 geschrieben: > > > Add's support to Raspberry Pi's 7" Touch device. Instead of using a > conventional bus all information is copied into a memory mapped area by > RPi's firmware. > > Based on the driver found in RPi's kernel repository. > > Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de> > --- > drivers/input/touchscreen/Kconfig | 12 ++ > drivers/input/touchscreen/Makefile | 1 + > drivers/input/touchscreen/raspberrypi-ts.c | 223 +++++++++++++++++++++ > 3 files changed, 236 insertions(+) > create mode 100644 drivers/input/touchscreen/raspberrypi-ts.c > > diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig > index 2a80675cfd94..a9be434de738 100644 > --- a/drivers/input/touchscreen/Kconfig > +++ b/drivers/input/touchscreen/Kconfig > @@ -696,6 +696,18 @@ config TOUCHSCREEN_EDT_FT5X06 > To compile this driver as a module, choose M here: the > module will be called edt-ft5x06. > > +config TOUCHSCREEN_RASPBERRYPI_TS I assume TS stands for TOUCHSCREEN, so we can use just TOUCHSCREEN_RASPBERRYPI or TOUCHSCREEN_RASPBERRYPI_FW > + tristate "Raspberry Pi's firmware base touch screen support" > + depends on RASPBERRYPI_FIRMWARE || COMPILE_TEST > + help > + Say Y here if you have the offitial Raspberry Pi 7' scren on your s/offitial/official/ s/7'/7 inch/ s/scren/screen/ > + system. > + > + If unsure, say N. > + > + To compile this driver as a module, choose M here: the > + module will be called raspberrypi-ts. > + > config TOUCHSCREEN_MIGOR > tristate "Renesas MIGO-R touchscreen" > depends on (SH_MIGOR || COMPILE_TEST) && I2C > diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile > index 5911a4190cd2..3eccb1925e89 100644 > --- a/drivers/input/touchscreen/Makefile > +++ b/drivers/input/touchscreen/Makefile > @@ -109,3 +109,4 @@ obj-$(CONFIG_TOUCHSCREEN_ZET6223) += zet6223.o > obj-$(CONFIG_TOUCHSCREEN_ZFORCE) += zforce_ts.o > obj-$(CONFIG_TOUCHSCREEN_COLIBRI_VF50) += colibri-vf50-ts.o > obj-$(CONFIG_TOUCHSCREEN_ROHM_BU21023) += rohm_bu21023.o > +obj-$(CONFIG_TOUCHSCREEN_RASPBERRYPI_TS) += raspberrypi-ts.o > diff --git a/drivers/input/touchscreen/raspberrypi-ts.c b/drivers/input/touchscreen/raspberrypi-ts.c > new file mode 100644 > index 000000000000..edc92018687e > --- /dev/null > +++ b/drivers/input/touchscreen/raspberrypi-ts.c > @@ -0,0 +1,223 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/* > + * Raspberry Pi 3 firmware based touchscreen driver AFAIK this driver isn't specific to a Raspberry Pi version, so we can drop the 3 > + * > + * Copyright (C) 2015, 2017 Raspberry Pi > + * Copyright (C) 2018 Nicolas Saenz Julienne <nsaenzjulienne@suse.de> > + */ > + > +#include <linux/io.h> > +#include <linux/slab.h> > +#include <linux/module.h> > +#include <linux/bitops.h> > +#include <linux/dma-mapping.h> > +#include <linux/platform_device.h> I'm missing linux/of.h and linux/device.h here. > +#include <linux/input.h> > +#include <linux/input/mt.h> > +#include <linux/input-polldev.h> > +#include <linux/input/touchscreen.h> > +#include <soc/bcm2835/raspberrypi-firmware.h> > + > +#define RPI_TS_DEFAULT_WIDTH 800 > +#define RPI_TS_DEFAULT_HEIGHT 480 > + > +#define RPI_TS_MAX_SUPPORTED_POINTS 10 > + > +#define RPI_TS_FTS_TOUCH_DOWN 0 > +#define RPI_TS_FTS_TOUCH_CONTACT 2 > + > +#define RPI_TS_POLL_INTERVAL 17 /* 60fps */ > + > +struct rpi_ts { > + struct platform_device *pdev; > + struct input_polled_dev *poll_dev; > + struct touchscreen_properties prop; > + > + void __iomem *fw_regs_va; > + dma_addr_t fw_regs_phys; > + > + int known_ids; > +}; > + > +struct rpi_ts_regs { > + u8 device_mode; > + u8 gesture_id; > + u8 num_points; > + struct rpi_ts_touch { > + u8 xh; > + u8 xl; > + u8 yh; > + u8 yl; > + u8 pressure; /* Not supported */ > + u8 area; /* Not supported */ > + } point[RPI_TS_MAX_SUPPORTED_POINTS]; > +}; > + > +/* > + * We poll the memory based register copy of the touchscreen chip using the > + * number of points register to know whether the copy has been updated (we > + * write 99 to the memory copy, the GPU will write between 0 - 10 points) > + */ I suggest to move this comment below to the memcpy_fromio. > +static void rpi_ts_poll(struct input_polled_dev *dev) > +{ > + struct input_dev *input = dev->input; > + struct rpi_ts *ts = dev->private; > + struct rpi_ts_regs regs; > + int modified_ids = 0; > + long released_ids; > + int event_type; > + int touchid; > + int x, y; > + int i; > + > + memcpy_fromio(®s, ts->fw_regs_va, sizeof(regs)); > + iowrite8(99, ts->fw_regs_va + offsetof(struct rpi_ts_regs, num_points)); I don't have a good name suggestion, but i think the magic 99 should be a define. > + > + if (regs.num_points == 99 || > + (regs.num_points == 0 && ts->known_ids == 0)) > + return; > + > + for (i = 0; i < regs.num_points; i++) { > + x = (((int)regs.point[i].xh & 0xf) << 8) + regs.point[i].xl; > + y = (((int)regs.point[i].yh & 0xf) << 8) + regs.point[i].yl; > + touchid = (regs.point[i].yh >> 4) & 0xf; > + event_type = (regs.point[i].xh >> 6) & 0x03; > + > + modified_ids |= BIT(touchid); > + > + if (event_type == RPI_TS_FTS_TOUCH_DOWN || > + event_type == RPI_TS_FTS_TOUCH_CONTACT) { > + input_mt_slot(input, touchid); > + input_mt_report_slot_state(input, MT_TOOL_FINGER, 1); > + touchscreen_report_pos(input, &ts->prop, x, y, true); > + } > + } > + > + released_ids = ts->known_ids & ~modified_ids; > + for_each_set_bit(i, &released_ids, RPI_TS_MAX_SUPPORTED_POINTS) { > + input_mt_slot(input, i); > + input_mt_report_slot_state(input, MT_TOOL_FINGER, 0); > + modified_ids &= ~(BIT(i)); > + } > + ts->known_ids = modified_ids; > + > + input_mt_sync_frame(input); > + input_sync(input); > +} > + > +static void rpi_ts_dma_cleanup(void *data) > +{ > + struct rpi_ts *ts = data; > + struct device *dev = &ts->pdev->dev; > + > + if(ts->fw_regs_va) > + dma_free_coherent(dev, PAGE_SIZE, ts->fw_regs_va, > + ts->fw_regs_phys); > +} > + > +static int rpi_ts_probe(struct platform_device *pdev) > +{ > + struct device *dev = &pdev->dev; > + struct device_node *np = dev->of_node; > + struct input_polled_dev *poll_dev; > + struct device_node *fw_node; > + struct rpi_firmware *fw; > + struct input_dev *input; > + struct rpi_ts *ts; > + u32 touchbuf; > + int ret; > + > + fw_node = of_get_parent(np); > + if (!fw_node) { > + dev_err(dev, "Missing firmware node\n"); > + return -ENOENT; > + } > + > + fw = rpi_firmware_get(fw_node); > + of_node_put(fw_node); > + if (!fw) > + return -EPROBE_DEFER; > + > + ts = devm_kzalloc(dev, sizeof(*ts), GFP_KERNEL); > + if (!ts) { > + dev_err(dev, "Failed to allocate memory\n"); AFAIK devm_kzalloc already prints an error > + return -ENOMEM; > + } > + ts->pdev = pdev; > + > + ret = devm_add_action_or_reset(dev, rpi_ts_dma_cleanup, ts); > + if (ret) > + return ret; > + > + ts->fw_regs_va = dma_zalloc_coherent(dev, PAGE_SIZE, &ts->fw_regs_phys, > + GFP_KERNEL); > + if (!ts->fw_regs_va) { > + dev_err(dev, "failed to dma_alloc_coherent\n"); > + return -ENOMEM; > + } > + > + touchbuf = (u32)ts->fw_regs_phys; > + ret = rpi_firmware_property(fw, RPI_FIRMWARE_FRAMEBUFFER_SET_TOUCHBUF, > + &touchbuf, sizeof(touchbuf)); > + > + if (ret || touchbuf != 0) { > + dev_warn(dev, "Failed to set touchbuf, trying to get err:%x\n", ret is an integer so %d > + ret); > + return ret; > + } > + > + poll_dev = devm_input_allocate_polled_device(dev); > + if (!poll_dev) { > + dev_err(dev, "Failed to allocate input device\n"); > + return -ENOMEM; > + } > + ts->poll_dev = poll_dev; > + input = poll_dev->input; > + > + input->name = "raspberrypi-ts"; > + input->id.bustype = BUS_HOST; > + poll_dev->poll_interval = RPI_TS_POLL_INTERVAL; > + poll_dev->poll = rpi_ts_poll; > + poll_dev->private = ts; > + > + __set_bit(EV_SYN, input->evbit); > + __set_bit(EV_KEY, input->evbit); > + __set_bit(EV_ABS, input->evbit); > + > + input_set_abs_params(input, ABS_MT_POSITION_X, 0, > + RPI_TS_DEFAULT_WIDTH, 0, 0); > + input_set_abs_params(input, ABS_MT_POSITION_Y, 0, > + RPI_TS_DEFAULT_HEIGHT, 0, 0); > + touchscreen_parse_properties(input, true, &ts->prop); > + > + input_mt_init_slots(input, RPI_TS_MAX_SUPPORTED_POINTS, > + INPUT_MT_DIRECT | INPUT_MT_POINTER); > + > + ret = input_register_polled_device(poll_dev); > + if (ret) { > + dev_err(dev, "could not register input device, %d\n", ret); > + return ret; > + } > + > + return 0; > +} > + > +static const struct of_device_id rpi_ts_match[] = { > + { .compatible = "raspberrypi,firmware-ts", }, > + {}, > +}; > +MODULE_DEVICE_TABLE(of, rpi_ts_match); > + > +static struct platform_driver rpi_ts_driver = { > + .driver = { > + .name = "raspberrypi-ts", > + .of_match_table = rpi_ts_match, > + }, > + .probe = rpi_ts_probe, > +}; > +module_platform_driver(rpi_ts_driver); > + > +MODULE_AUTHOR("Gordon Hollingworth"); > +MODULE_AUTHOR("Nicolas Saenz Julienne <nsaenzjulienne@suse.de>"); > +MODULE_DESCRIPTION("Raspberry Pi 3 firmware based touchscreen driver"); Please also drop the 3 here > +MODULE_LICENSE("GPL v2"); > -- > 2.19.2 >
diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig index 2a80675cfd94..a9be434de738 100644 --- a/drivers/input/touchscreen/Kconfig +++ b/drivers/input/touchscreen/Kconfig @@ -696,6 +696,18 @@ config TOUCHSCREEN_EDT_FT5X06 To compile this driver as a module, choose M here: the module will be called edt-ft5x06. +config TOUCHSCREEN_RASPBERRYPI_TS + tristate "Raspberry Pi's firmware base touch screen support" + depends on RASPBERRYPI_FIRMWARE || COMPILE_TEST + help + Say Y here if you have the offitial Raspberry Pi 7' scren on your + system. + + If unsure, say N. + + To compile this driver as a module, choose M here: the + module will be called raspberrypi-ts. + config TOUCHSCREEN_MIGOR tristate "Renesas MIGO-R touchscreen" depends on (SH_MIGOR || COMPILE_TEST) && I2C diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile index 5911a4190cd2..3eccb1925e89 100644 --- a/drivers/input/touchscreen/Makefile +++ b/drivers/input/touchscreen/Makefile @@ -109,3 +109,4 @@ obj-$(CONFIG_TOUCHSCREEN_ZET6223) += zet6223.o obj-$(CONFIG_TOUCHSCREEN_ZFORCE) += zforce_ts.o obj-$(CONFIG_TOUCHSCREEN_COLIBRI_VF50) += colibri-vf50-ts.o obj-$(CONFIG_TOUCHSCREEN_ROHM_BU21023) += rohm_bu21023.o +obj-$(CONFIG_TOUCHSCREEN_RASPBERRYPI_TS) += raspberrypi-ts.o diff --git a/drivers/input/touchscreen/raspberrypi-ts.c b/drivers/input/touchscreen/raspberrypi-ts.c new file mode 100644 index 000000000000..edc92018687e --- /dev/null +++ b/drivers/input/touchscreen/raspberrypi-ts.c @@ -0,0 +1,223 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Raspberry Pi 3 firmware based touchscreen driver + * + * Copyright (C) 2015, 2017 Raspberry Pi + * Copyright (C) 2018 Nicolas Saenz Julienne <nsaenzjulienne@suse.de> + */ + +#include <linux/io.h> +#include <linux/slab.h> +#include <linux/module.h> +#include <linux/bitops.h> +#include <linux/dma-mapping.h> +#include <linux/platform_device.h> +#include <linux/input.h> +#include <linux/input/mt.h> +#include <linux/input-polldev.h> +#include <linux/input/touchscreen.h> +#include <soc/bcm2835/raspberrypi-firmware.h> + +#define RPI_TS_DEFAULT_WIDTH 800 +#define RPI_TS_DEFAULT_HEIGHT 480 + +#define RPI_TS_MAX_SUPPORTED_POINTS 10 + +#define RPI_TS_FTS_TOUCH_DOWN 0 +#define RPI_TS_FTS_TOUCH_CONTACT 2 + +#define RPI_TS_POLL_INTERVAL 17 /* 60fps */ + +struct rpi_ts { + struct platform_device *pdev; + struct input_polled_dev *poll_dev; + struct touchscreen_properties prop; + + void __iomem *fw_regs_va; + dma_addr_t fw_regs_phys; + + int known_ids; +}; + +struct rpi_ts_regs { + u8 device_mode; + u8 gesture_id; + u8 num_points; + struct rpi_ts_touch { + u8 xh; + u8 xl; + u8 yh; + u8 yl; + u8 pressure; /* Not supported */ + u8 area; /* Not supported */ + } point[RPI_TS_MAX_SUPPORTED_POINTS]; +}; + +/* + * We poll the memory based register copy of the touchscreen chip using the + * number of points register to know whether the copy has been updated (we + * write 99 to the memory copy, the GPU will write between 0 - 10 points) + */ +static void rpi_ts_poll(struct input_polled_dev *dev) +{ + struct input_dev *input = dev->input; + struct rpi_ts *ts = dev->private; + struct rpi_ts_regs regs; + int modified_ids = 0; + long released_ids; + int event_type; + int touchid; + int x, y; + int i; + + memcpy_fromio(®s, ts->fw_regs_va, sizeof(regs)); + iowrite8(99, ts->fw_regs_va + offsetof(struct rpi_ts_regs, num_points)); + + if (regs.num_points == 99 || + (regs.num_points == 0 && ts->known_ids == 0)) + return; + + for (i = 0; i < regs.num_points; i++) { + x = (((int)regs.point[i].xh & 0xf) << 8) + regs.point[i].xl; + y = (((int)regs.point[i].yh & 0xf) << 8) + regs.point[i].yl; + touchid = (regs.point[i].yh >> 4) & 0xf; + event_type = (regs.point[i].xh >> 6) & 0x03; + + modified_ids |= BIT(touchid); + + if (event_type == RPI_TS_FTS_TOUCH_DOWN || + event_type == RPI_TS_FTS_TOUCH_CONTACT) { + input_mt_slot(input, touchid); + input_mt_report_slot_state(input, MT_TOOL_FINGER, 1); + touchscreen_report_pos(input, &ts->prop, x, y, true); + } + } + + released_ids = ts->known_ids & ~modified_ids; + for_each_set_bit(i, &released_ids, RPI_TS_MAX_SUPPORTED_POINTS) { + input_mt_slot(input, i); + input_mt_report_slot_state(input, MT_TOOL_FINGER, 0); + modified_ids &= ~(BIT(i)); + } + ts->known_ids = modified_ids; + + input_mt_sync_frame(input); + input_sync(input); +} + +static void rpi_ts_dma_cleanup(void *data) +{ + struct rpi_ts *ts = data; + struct device *dev = &ts->pdev->dev; + + if(ts->fw_regs_va) + dma_free_coherent(dev, PAGE_SIZE, ts->fw_regs_va, + ts->fw_regs_phys); +} + +static int rpi_ts_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct device_node *np = dev->of_node; + struct input_polled_dev *poll_dev; + struct device_node *fw_node; + struct rpi_firmware *fw; + struct input_dev *input; + struct rpi_ts *ts; + u32 touchbuf; + int ret; + + fw_node = of_get_parent(np); + if (!fw_node) { + dev_err(dev, "Missing firmware node\n"); + return -ENOENT; + } + + fw = rpi_firmware_get(fw_node); + of_node_put(fw_node); + if (!fw) + return -EPROBE_DEFER; + + ts = devm_kzalloc(dev, sizeof(*ts), GFP_KERNEL); + if (!ts) { + dev_err(dev, "Failed to allocate memory\n"); + return -ENOMEM; + } + ts->pdev = pdev; + + ret = devm_add_action_or_reset(dev, rpi_ts_dma_cleanup, ts); + if (ret) + return ret; + + ts->fw_regs_va = dma_zalloc_coherent(dev, PAGE_SIZE, &ts->fw_regs_phys, + GFP_KERNEL); + if (!ts->fw_regs_va) { + dev_err(dev, "failed to dma_alloc_coherent\n"); + return -ENOMEM; + } + + touchbuf = (u32)ts->fw_regs_phys; + ret = rpi_firmware_property(fw, RPI_FIRMWARE_FRAMEBUFFER_SET_TOUCHBUF, + &touchbuf, sizeof(touchbuf)); + + if (ret || touchbuf != 0) { + dev_warn(dev, "Failed to set touchbuf, trying to get err:%x\n", + ret); + return ret; + } + + poll_dev = devm_input_allocate_polled_device(dev); + if (!poll_dev) { + dev_err(dev, "Failed to allocate input device\n"); + return -ENOMEM; + } + ts->poll_dev = poll_dev; + input = poll_dev->input; + + input->name = "raspberrypi-ts"; + input->id.bustype = BUS_HOST; + poll_dev->poll_interval = RPI_TS_POLL_INTERVAL; + poll_dev->poll = rpi_ts_poll; + poll_dev->private = ts; + + __set_bit(EV_SYN, input->evbit); + __set_bit(EV_KEY, input->evbit); + __set_bit(EV_ABS, input->evbit); + + input_set_abs_params(input, ABS_MT_POSITION_X, 0, + RPI_TS_DEFAULT_WIDTH, 0, 0); + input_set_abs_params(input, ABS_MT_POSITION_Y, 0, + RPI_TS_DEFAULT_HEIGHT, 0, 0); + touchscreen_parse_properties(input, true, &ts->prop); + + input_mt_init_slots(input, RPI_TS_MAX_SUPPORTED_POINTS, + INPUT_MT_DIRECT | INPUT_MT_POINTER); + + ret = input_register_polled_device(poll_dev); + if (ret) { + dev_err(dev, "could not register input device, %d\n", ret); + return ret; + } + + return 0; +} + +static const struct of_device_id rpi_ts_match[] = { + { .compatible = "raspberrypi,firmware-ts", }, + {}, +}; +MODULE_DEVICE_TABLE(of, rpi_ts_match); + +static struct platform_driver rpi_ts_driver = { + .driver = { + .name = "raspberrypi-ts", + .of_match_table = rpi_ts_match, + }, + .probe = rpi_ts_probe, +}; +module_platform_driver(rpi_ts_driver); + +MODULE_AUTHOR("Gordon Hollingworth"); +MODULE_AUTHOR("Nicolas Saenz Julienne <nsaenzjulienne@suse.de>"); +MODULE_DESCRIPTION("Raspberry Pi 3 firmware based touchscreen driver"); +MODULE_LICENSE("GPL v2");
Add's support to Raspberry Pi's 7" Touch device. Instead of using a conventional bus all information is copied into a memory mapped area by RPi's firmware. Based on the driver found in RPi's kernel repository. Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de> --- drivers/input/touchscreen/Kconfig | 12 ++ drivers/input/touchscreen/Makefile | 1 + drivers/input/touchscreen/raspberrypi-ts.c | 223 +++++++++++++++++++++ 3 files changed, 236 insertions(+) create mode 100644 drivers/input/touchscreen/raspberrypi-ts.c