* [PATCH v3 0/4] Pine64 PinePhone keyboard support
@ 2022-04-24 16:04 Samuel Holland
2022-04-24 16:04 ` [PATCH v3 1/4] dt-bindings: input: Add the PinePhone keyboard binding Samuel Holland
` (3 more replies)
0 siblings, 4 replies; 6+ messages in thread
From: Samuel Holland @ 2022-04-24 16:04 UTC (permalink / raw)
To: Dmitry Torokhov, linux-input
Cc: Rob Herring, Ondrej Jirman, devicetree, linux-kernel,
Krzysztof Kozlowski, Samuel Holland
This series adds support for the official keyboard case for the Pine64
PinePhone and PinePhone Pro. This accessory contains a keyboard MCU and
an IP5209 power bank IC. The keyboard MCU firmware[0] is free software.
It exposes the keyboard scan matrix over I2C, and also provides commands
for SMBus access to the IP5209. In order to keep the IP5209 driver
(CONFIG_IP5XXX_POWER) generic, this is modeled as a child I2C bus.
[0]: https://megous.com/git/pinephone-keyboard/about/
Changes in v3:
- Replace unevaluatedProperties with additionalProperties
- Rename i2c-bus to i2c
Changes in v2:
- Drop keymap DT properties
- Add vbat-supply property
- Fix missing key release events when FN state changes
- Add VBAT consumer to ensure enough power is available for the MCU
- Use a single fixed-size, fixed-contents keymap for both layers
Samuel Holland (4):
dt-bindings: input: Add the PinePhone keyboard binding
Input: pinephone-keyboard - Add PinePhone keyboard driver
Input: pinephone-keyboard - Support the proxied I2C bus
[DO NOT MERGE] arm64: dts: allwinner: pinephone: Add keyboard
.../input/pine64,pinephone-keyboard.yaml | 66 +++
MAINTAINERS | 6 +
.../dts/allwinner/sun50i-a64-pinephone.dtsi | 18 +
drivers/input/keyboard/Kconfig | 10 +
drivers/input/keyboard/Makefile | 1 +
drivers/input/keyboard/pinephone-keyboard.c | 438 ++++++++++++++++++
6 files changed, 539 insertions(+)
create mode 100644 Documentation/devicetree/bindings/input/pine64,pinephone-keyboard.yaml
create mode 100644 drivers/input/keyboard/pinephone-keyboard.c
--
2.35.1
^ permalink raw reply [flat|nested] 6+ messages in thread* [PATCH v3 1/4] dt-bindings: input: Add the PinePhone keyboard binding 2022-04-24 16:04 [PATCH v3 0/4] Pine64 PinePhone keyboard support Samuel Holland @ 2022-04-24 16:04 ` Samuel Holland 2022-04-25 17:52 ` Krzysztof Kozlowski 2022-04-24 16:04 ` [PATCH v3 2/4] Input: pinephone-keyboard - Add PinePhone keyboard driver Samuel Holland ` (2 subsequent siblings) 3 siblings, 1 reply; 6+ messages in thread From: Samuel Holland @ 2022-04-24 16:04 UTC (permalink / raw) To: Dmitry Torokhov, linux-input Cc: Rob Herring, Ondrej Jirman, devicetree, linux-kernel, Krzysztof Kozlowski, Samuel Holland Add devicetree support for the PinePhone keyboard case, which provides a matrix keyboard interface and a proxied I2C bus. Signed-off-by: Samuel Holland <samuel@sholland.org> --- Changes in v3: - Replace unevaluatedProperties with additionalProperties - Rename i2c-bus to i2c Changes in v2: - Drop keymap DT properties - Add vbat-supply property .../input/pine64,pinephone-keyboard.yaml | 66 +++++++++++++++++++ 1 file changed, 66 insertions(+) create mode 100644 Documentation/devicetree/bindings/input/pine64,pinephone-keyboard.yaml diff --git a/Documentation/devicetree/bindings/input/pine64,pinephone-keyboard.yaml b/Documentation/devicetree/bindings/input/pine64,pinephone-keyboard.yaml new file mode 100644 index 000000000000..e4a0ac0fff9a --- /dev/null +++ b/Documentation/devicetree/bindings/input/pine64,pinephone-keyboard.yaml @@ -0,0 +1,66 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/input/pine64,pinephone-keyboard.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Pine64 PinePhone keyboard device tree bindings + +maintainers: + - Samuel Holland <samuel@sholland.org> + +description: + A keyboard accessory is available for the Pine64 PinePhone and PinePhone Pro. + It connects via I2C, providing a raw scan matrix, a flashing interface, and a + subordinate I2C bus for communication with a battery charger IC. + +properties: + compatible: + const: pine64,pinephone-keyboard + + reg: + const: 0x15 + + interrupts: + maxItems: 1 + + vbat-supply: + description: Supply for the keyboard MCU + + wakeup-source: true + + i2c: + $ref: /schemas/i2c/i2c-controller.yaml# + +required: + - compatible + - reg + - interrupts + +additionalProperties: false + +examples: + - | + #include <dt-bindings/input/input.h> + #include <dt-bindings/interrupt-controller/irq.h> + + i2c { + #address-cells = <1>; + #size-cells = <0>; + + keyboard@15 { + compatible = "pine64,pinephone-keyboard"; + reg = <0x15>; + interrupt-parent = <&r_pio>; + interrupts = <0 12 IRQ_TYPE_EDGE_FALLING>; /* PL12 */ + + i2c { + #address-cells = <1>; + #size-cells = <0>; + + charger@75 { + reg = <0x75>; + }; + }; + }; + }; -- 2.35.1 ^ permalink raw reply related [flat|nested] 6+ messages in thread
* Re: [PATCH v3 1/4] dt-bindings: input: Add the PinePhone keyboard binding 2022-04-24 16:04 ` [PATCH v3 1/4] dt-bindings: input: Add the PinePhone keyboard binding Samuel Holland @ 2022-04-25 17:52 ` Krzysztof Kozlowski 0 siblings, 0 replies; 6+ messages in thread From: Krzysztof Kozlowski @ 2022-04-25 17:52 UTC (permalink / raw) To: Samuel Holland, Dmitry Torokhov, linux-input Cc: Rob Herring, Ondrej Jirman, devicetree, linux-kernel, Krzysztof Kozlowski On 24/04/2022 18:04, Samuel Holland wrote: > Add devicetree support for the PinePhone keyboard case, which provides a > matrix keyboard interface and a proxied I2C bus. > > Signed-off-by: Samuel Holland <samuel@sholland.org> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> Best regards, Krzysztof ^ permalink raw reply [flat|nested] 6+ messages in thread
* [PATCH v3 2/4] Input: pinephone-keyboard - Add PinePhone keyboard driver 2022-04-24 16:04 [PATCH v3 0/4] Pine64 PinePhone keyboard support Samuel Holland 2022-04-24 16:04 ` [PATCH v3 1/4] dt-bindings: input: Add the PinePhone keyboard binding Samuel Holland @ 2022-04-24 16:04 ` Samuel Holland 2022-04-24 16:04 ` [PATCH v3 3/4] Input: pinephone-keyboard - Support the proxied I2C bus Samuel Holland 2022-04-24 16:04 ` [PATCH v3 4/4] [DO NOT MERGE] arm64: dts: allwinner: pinephone: Add keyboard Samuel Holland 3 siblings, 0 replies; 6+ messages in thread From: Samuel Holland @ 2022-04-24 16:04 UTC (permalink / raw) To: Dmitry Torokhov, linux-input Cc: Rob Herring, Ondrej Jirman, devicetree, linux-kernel, Krzysztof Kozlowski, Samuel Holland The official Pine64 PinePhone keyboard case contains a matrix keypad and a MCU which runs a libre firmware. Add support for its I2C interface. Signed-off-by: Samuel Holland <samuel@sholland.org> --- (no changes since v2) Changes in v2: - Fix missing key release events when FN state changes - Add VBAT consumer to ensure enough power is available for the MCU - Use a single fixed-size, fixed-contents keymap for both layers MAINTAINERS | 6 + drivers/input/keyboard/Kconfig | 10 + drivers/input/keyboard/Makefile | 1 + drivers/input/keyboard/pinephone-keyboard.c | 365 ++++++++++++++++++++ 4 files changed, 382 insertions(+) create mode 100644 drivers/input/keyboard/pinephone-keyboard.c diff --git a/MAINTAINERS b/MAINTAINERS index fd768d43e048..2f77efd8362e 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -15648,6 +15648,12 @@ S: Maintained F: Documentation/devicetree/bindings/iio/chemical/plantower,pms7003.yaml F: drivers/iio/chemical/pms7003.c +PINE64 PINEPHONE KEYBOARD DRIVER +M: Samuel Holland <samuel@sholland.org> +S: Supported +F: Documentation/devicetree/bindings/input/pine64,pinephone-keyboard.yaml +F: drivers/input/keyboard/pinephone-keyboard.c + PLDMFW LIBRARY M: Jacob Keller <jacob.e.keller@intel.com> S: Maintained diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig index 4ea79db8f134..0a84aa4b6209 100644 --- a/drivers/input/keyboard/Kconfig +++ b/drivers/input/keyboard/Kconfig @@ -524,6 +524,16 @@ config KEYBOARD_OPENCORES To compile this driver as a module, choose M here; the module will be called opencores-kbd. +config KEYBOARD_PINEPHONE + tristate "Pine64 PinePhone Keyboard" + depends on I2C && REGULATOR + select CRC8 + select INPUT_MATRIXKMAP + help + Say Y here to enable support for the keyboard in the Pine64 PinePhone + keyboard case. This driver supports the FLOSS firmware available at + https://megous.com/git/pinephone-keyboard/ + config KEYBOARD_PXA27x tristate "PXA27x/PXA3xx keypad support" depends on PXA27x || PXA3xx || ARCH_MMP diff --git a/drivers/input/keyboard/Makefile b/drivers/input/keyboard/Makefile index 721936e90290..5f67196bb2c1 100644 --- a/drivers/input/keyboard/Makefile +++ b/drivers/input/keyboard/Makefile @@ -52,6 +52,7 @@ obj-$(CONFIG_KEYBOARD_NSPIRE) += nspire-keypad.o obj-$(CONFIG_KEYBOARD_OMAP) += omap-keypad.o obj-$(CONFIG_KEYBOARD_OMAP4) += omap4-keypad.o obj-$(CONFIG_KEYBOARD_OPENCORES) += opencores-kbd.o +obj-$(CONFIG_KEYBOARD_PINEPHONE) += pinephone-keyboard.o obj-$(CONFIG_KEYBOARD_PMIC8XXX) += pmic8xxx-keypad.o obj-$(CONFIG_KEYBOARD_PXA27x) += pxa27x_keypad.o obj-$(CONFIG_KEYBOARD_PXA930_ROTARY) += pxa930_rotary.o diff --git a/drivers/input/keyboard/pinephone-keyboard.c b/drivers/input/keyboard/pinephone-keyboard.c new file mode 100644 index 000000000000..2ee74cbe68dd --- /dev/null +++ b/drivers/input/keyboard/pinephone-keyboard.c @@ -0,0 +1,365 @@ +// SPDX-License-Identifier: GPL-2.0-only +// +// Copyright (C) 2021-2022 Samuel Holland <samuel@sholland.org> + +#include <linux/crc8.h> +#include <linux/i2c.h> +#include <linux/input/matrix_keypad.h> +#include <linux/interrupt.h> +#include <linux/module.h> +#include <linux/regulator/consumer.h> + +#define DRV_NAME "pinephone-keyboard" + +#define PPKB_CRC8_POLYNOMIAL 0x07 + +#define PPKB_DEVICE_ID_HI 0x00 +#define PPKB_DEVICE_ID_HI_VALUE 'K' +#define PPKB_DEVICE_ID_LO 0x01 +#define PPKB_DEVICE_ID_LO_VALUE 'B' +#define PPKB_FW_REVISION 0x02 +#define PPKB_FW_FEATURES 0x03 +#define PPKB_MATRIX_SIZE 0x06 +#define PPKB_SCAN_CRC 0x07 +#define PPKB_SCAN_DATA 0x08 +#define PPKB_SYS_CONFIG 0x20 +#define PPKB_SYS_CONFIG_DISABLE_SCAN BIT(0) + +#define PPKB_ROWS 6 +#define PPKB_COLS 12 + +/* Size of the scan buffer, including the CRC byte at the beginning. */ +#define PPKB_BUF_LEN (1 + PPKB_COLS) + +static const uint32_t ppkb_keymap[] = { + KEY(0, 0, KEY_ESC), + KEY(0, 1, KEY_1), + KEY(0, 2, KEY_2), + KEY(0, 3, KEY_3), + KEY(0, 4, KEY_4), + KEY(0, 5, KEY_5), + KEY(0, 6, KEY_6), + KEY(0, 7, KEY_7), + KEY(0, 8, KEY_8), + KEY(0, 9, KEY_9), + KEY(0, 10, KEY_0), + KEY(0, 11, KEY_BACKSPACE), + + KEY(1, 0, KEY_TAB), + KEY(1, 1, KEY_Q), + KEY(1, 2, KEY_W), + KEY(1, 3, KEY_E), + KEY(1, 4, KEY_R), + KEY(1, 5, KEY_T), + KEY(1, 6, KEY_Y), + KEY(1, 7, KEY_U), + KEY(1, 8, KEY_I), + KEY(1, 9, KEY_O), + KEY(1, 10, KEY_P), + KEY(1, 11, KEY_ENTER), + + KEY(2, 0, KEY_LEFTMETA), + KEY(2, 1, KEY_A), + KEY(2, 2, KEY_S), + KEY(2, 3, KEY_D), + KEY(2, 4, KEY_F), + KEY(2, 5, KEY_G), + KEY(2, 6, KEY_H), + KEY(2, 7, KEY_J), + KEY(2, 8, KEY_K), + KEY(2, 9, KEY_L), + KEY(2, 10, KEY_SEMICOLON), + + KEY(3, 0, KEY_LEFTSHIFT), + KEY(3, 1, KEY_Z), + KEY(3, 2, KEY_X), + KEY(3, 3, KEY_C), + KEY(3, 4, KEY_V), + KEY(3, 5, KEY_B), + KEY(3, 6, KEY_N), + KEY(3, 7, KEY_M), + KEY(3, 8, KEY_COMMA), + KEY(3, 9, KEY_DOT), + KEY(3, 10, KEY_SLASH), + + KEY(4, 1, KEY_LEFTCTRL), + KEY(4, 4, KEY_SPACE), + KEY(4, 6, KEY_APOSTROPHE), + KEY(4, 8, KEY_RIGHTBRACE), + KEY(4, 9, KEY_LEFTBRACE), + + KEY(5, 2, KEY_FN), + KEY(5, 3, KEY_LEFTALT), + KEY(5, 5, KEY_RIGHTALT), + + /* FN layer */ + KEY(PPKB_ROWS + 0, 0, KEY_FN_ESC), + KEY(PPKB_ROWS + 0, 1, KEY_F1), + KEY(PPKB_ROWS + 0, 2, KEY_F2), + KEY(PPKB_ROWS + 0, 3, KEY_F3), + KEY(PPKB_ROWS + 0, 4, KEY_F4), + KEY(PPKB_ROWS + 0, 5, KEY_F5), + KEY(PPKB_ROWS + 0, 6, KEY_F6), + KEY(PPKB_ROWS + 0, 7, KEY_F7), + KEY(PPKB_ROWS + 0, 8, KEY_F8), + KEY(PPKB_ROWS + 0, 9, KEY_F9), + KEY(PPKB_ROWS + 0, 10, KEY_F10), + KEY(PPKB_ROWS + 0, 11, KEY_DELETE), + + KEY(PPKB_ROWS + 1, 10, KEY_PAGEUP), + + KEY(PPKB_ROWS + 2, 0, KEY_SYSRQ), + KEY(PPKB_ROWS + 2, 9, KEY_PAGEDOWN), + KEY(PPKB_ROWS + 2, 10, KEY_INSERT), + + KEY(PPKB_ROWS + 3, 0, KEY_LEFTSHIFT), + KEY(PPKB_ROWS + 3, 8, KEY_HOME), + KEY(PPKB_ROWS + 3, 9, KEY_UP), + KEY(PPKB_ROWS + 3, 10, KEY_END), + + KEY(PPKB_ROWS + 4, 1, KEY_LEFTCTRL), + KEY(PPKB_ROWS + 4, 6, KEY_LEFT), + KEY(PPKB_ROWS + 4, 8, KEY_RIGHT), + KEY(PPKB_ROWS + 4, 9, KEY_DOWN), + + KEY(PPKB_ROWS + 5, 3, KEY_LEFTALT), + KEY(PPKB_ROWS + 5, 5, KEY_RIGHTALT), +}; + +static const struct matrix_keymap_data ppkb_keymap_data = { + .keymap = ppkb_keymap, + .keymap_size = ARRAY_SIZE(ppkb_keymap), +}; + +struct pinephone_keyboard { + struct input_dev *input; + u8 buf[2][PPKB_BUF_LEN]; + u8 crc_table[CRC8_TABLE_SIZE]; + u8 fn_state[PPKB_COLS]; + bool buf_swap; + bool fn_pressed; +}; + +static void ppkb_update(struct i2c_client *client) +{ + struct pinephone_keyboard *ppkb = i2c_get_clientdata(client); + unsigned short *keymap = ppkb->input->keycode; + int row_shift = get_count_order(PPKB_COLS); + u8 *old_buf = ppkb->buf[!ppkb->buf_swap]; + u8 *new_buf = ppkb->buf[ppkb->buf_swap]; + int col, crc, ret, row; + struct device *dev = &client->dev; + + ret = i2c_smbus_read_i2c_block_data(client, PPKB_SCAN_CRC, + PPKB_BUF_LEN, new_buf); + if (ret != PPKB_BUF_LEN) { + dev_err(dev, "Failed to read scan data: %d\n", ret); + return; + } + + crc = crc8(ppkb->crc_table, &new_buf[1], PPKB_COLS, CRC8_INIT_VALUE); + if (crc != new_buf[0]) { + dev_err(dev, "Bad scan data (%02x != %02x)\n", crc, new_buf[0]); + return; + } + + ppkb->buf_swap = !ppkb->buf_swap; + + for (col = 0; col < PPKB_COLS; ++col) { + u8 old = old_buf[1 + col]; + u8 new = new_buf[1 + col]; + u8 changed = old ^ new; + + if (!changed) + continue; + + for (row = 0; row < PPKB_ROWS; ++row) { + u8 mask = BIT(row); + u8 value = new & mask; + unsigned short code; + bool fn_state; + + if (!(changed & mask)) + continue; + + /* + * Save off the FN key state when the key was pressed, + * and use that to determine the code during a release. + */ + fn_state = value ? ppkb->fn_pressed : ppkb->fn_state[col] & mask; + if (fn_state) + ppkb->fn_state[col] ^= mask; + + /* The FN layer is a second set of rows. */ + code = MATRIX_SCAN_CODE(fn_state ? PPKB_ROWS + row : row, + col, row_shift); + input_event(ppkb->input, EV_MSC, MSC_SCAN, code); + input_report_key(ppkb->input, keymap[code], value); + if (keymap[code] == KEY_FN) + ppkb->fn_pressed = value; + } + } + input_sync(ppkb->input); +} + +static irqreturn_t ppkb_irq_thread(int irq, void *data) +{ + struct i2c_client *client = data; + + ppkb_update(client); + + return IRQ_HANDLED; +} + +static int ppkb_set_scan(struct i2c_client *client, bool enable) +{ + struct device *dev = &client->dev; + int ret, val; + + ret = i2c_smbus_read_byte_data(client, PPKB_SYS_CONFIG); + if (ret < 0) { + dev_err(dev, "Failed to read config: %d\n", ret); + return ret; + } + + if (enable) + val = ret & ~PPKB_SYS_CONFIG_DISABLE_SCAN; + else + val = ret | PPKB_SYS_CONFIG_DISABLE_SCAN; + ret = i2c_smbus_write_byte_data(client, PPKB_SYS_CONFIG, val); + if (ret) { + dev_err(dev, "Failed to write config: %d\n", ret); + return ret; + } + + return 0; +} + +static int ppkb_open(struct input_dev *input) +{ + struct i2c_client *client = input_get_drvdata(input); + int ret; + + ret = ppkb_set_scan(client, true); + if (ret) + return ret; + + return 0; +} + +static void ppkb_close(struct input_dev *input) +{ + struct i2c_client *client = input_get_drvdata(input); + + ppkb_set_scan(client, false); +} + +static void ppkb_regulator_disable(void *regulator) +{ + regulator_disable(regulator); +} + +static int ppkb_probe(struct i2c_client *client) +{ + struct device *dev = &client->dev; + unsigned int phys_rows, phys_cols; + struct pinephone_keyboard *ppkb; + struct regulator *vbat_supply; + u8 info[PPKB_MATRIX_SIZE + 1]; + int ret; + + vbat_supply = devm_regulator_get(dev, "vbat"); + if (IS_ERR(vbat_supply)) + return dev_err_probe(dev, PTR_ERR(vbat_supply), + "Failed to get VBAT supply"); + + ret = regulator_enable(vbat_supply); + if (ret) + return dev_err_probe(dev, ret, "Failed to enable VBAT"); + + ret = devm_add_action_or_reset(dev, ppkb_regulator_disable, vbat_supply); + if (ret) + return ret; + + ret = i2c_smbus_read_i2c_block_data(client, 0, sizeof(info), info); + if (ret != sizeof(info)) + return dev_err_probe(dev, -ENODEV, "Failed to read device ID\n"); + + if (info[PPKB_DEVICE_ID_HI] != PPKB_DEVICE_ID_HI_VALUE || + info[PPKB_DEVICE_ID_LO] != PPKB_DEVICE_ID_LO_VALUE) + return dev_err_probe(dev, -ENODEV, "Unexpected device ID\n"); + + dev_info(dev, "Found firmware version %d.%d features %#x\n", + info[PPKB_FW_REVISION] >> 4, + info[PPKB_FW_REVISION] & 0xf, + info[PPKB_FW_FEATURES]); + + phys_rows = info[PPKB_MATRIX_SIZE] & 0xf; + phys_cols = info[PPKB_MATRIX_SIZE] >> 4; + if (phys_rows != PPKB_ROWS || phys_cols != PPKB_COLS) + return dev_err_probe(dev, -EINVAL, "Unexpected keyboard size %ux%u\n", + phys_rows, phys_cols); + + /* Disable scan by default to save power. */ + ret = ppkb_set_scan(client, false); + if (ret) + return ret; + + ppkb = devm_kzalloc(dev, sizeof(*ppkb), GFP_KERNEL); + if (!ppkb) + return -ENOMEM; + + i2c_set_clientdata(client, ppkb); + + crc8_populate_msb(ppkb->crc_table, PPKB_CRC8_POLYNOMIAL); + + ppkb->input = devm_input_allocate_device(dev); + if (!ppkb->input) + return -ENOMEM; + + input_set_drvdata(ppkb->input, client); + + ppkb->input->name = "PinePhone Keyboard"; + ppkb->input->phys = DRV_NAME "/input0"; + ppkb->input->id.bustype = BUS_I2C; + ppkb->input->open = ppkb_open; + ppkb->input->close = ppkb_close; + + input_set_capability(ppkb->input, EV_MSC, MSC_SCAN); + __set_bit(EV_REP, ppkb->input->evbit); + + ret = matrix_keypad_build_keymap(&ppkb_keymap_data, NULL, 2 * PPKB_ROWS, + PPKB_COLS, NULL, ppkb->input); + if (ret) + return dev_err_probe(dev, ret, "Failed to build keymap\n"); + + ret = input_register_device(ppkb->input); + if (ret) + return dev_err_probe(dev, ret, "Failed to register input\n"); + + ret = devm_request_threaded_irq(dev, client->irq, NULL, ppkb_irq_thread, + IRQF_ONESHOT, client->name, client); + if (ret) + return dev_err_probe(dev, ret, "Failed to request IRQ\n"); + + return 0; +} + +static const struct of_device_id ppkb_of_match[] = { + { .compatible = "pine64,pinephone-keyboard" }, + { } +}; +MODULE_DEVICE_TABLE(of, ppkb_of_match); + +static struct i2c_driver ppkb_driver = { + .probe_new = ppkb_probe, + .driver = { + .name = DRV_NAME, + .of_match_table = ppkb_of_match, + }, +}; +module_i2c_driver(ppkb_driver); + +MODULE_AUTHOR("Samuel Holland <samuel@sholland.org>"); +MODULE_DESCRIPTION("Pine64 PinePhone keyboard driver"); +MODULE_LICENSE("GPL"); -- 2.35.1 ^ permalink raw reply related [flat|nested] 6+ messages in thread
* [PATCH v3 3/4] Input: pinephone-keyboard - Support the proxied I2C bus 2022-04-24 16:04 [PATCH v3 0/4] Pine64 PinePhone keyboard support Samuel Holland 2022-04-24 16:04 ` [PATCH v3 1/4] dt-bindings: input: Add the PinePhone keyboard binding Samuel Holland 2022-04-24 16:04 ` [PATCH v3 2/4] Input: pinephone-keyboard - Add PinePhone keyboard driver Samuel Holland @ 2022-04-24 16:04 ` Samuel Holland 2022-04-24 16:04 ` [PATCH v3 4/4] [DO NOT MERGE] arm64: dts: allwinner: pinephone: Add keyboard Samuel Holland 3 siblings, 0 replies; 6+ messages in thread From: Samuel Holland @ 2022-04-24 16:04 UTC (permalink / raw) To: Dmitry Torokhov, linux-input Cc: Rob Herring, Ondrej Jirman, devicetree, linux-kernel, Krzysztof Kozlowski, Samuel Holland The PinePhone keyboard case contains a battery managed by an integrated power bank IC. The power bank IC communicates over I2C, and the keyboard MCU firmware provides an interface to read and write its registers. Let's use this interface to implement a SMBus adapter, so we can reuse the driver for the power bank IC. Signed-off-by: Samuel Holland <samuel@sholland.org> --- Changes in v3: - Rename i2c-bus to i2c drivers/input/keyboard/pinephone-keyboard.c | 73 +++++++++++++++++++++ 1 file changed, 73 insertions(+) diff --git a/drivers/input/keyboard/pinephone-keyboard.c b/drivers/input/keyboard/pinephone-keyboard.c index 2ee74cbe68dd..008e1322bd2d 100644 --- a/drivers/input/keyboard/pinephone-keyboard.c +++ b/drivers/input/keyboard/pinephone-keyboard.c @@ -3,6 +3,7 @@ // Copyright (C) 2021-2022 Samuel Holland <samuel@sholland.org> #include <linux/crc8.h> +#include <linux/delay.h> #include <linux/i2c.h> #include <linux/input/matrix_keypad.h> #include <linux/interrupt.h> @@ -24,6 +25,11 @@ #define PPKB_SCAN_DATA 0x08 #define PPKB_SYS_CONFIG 0x20 #define PPKB_SYS_CONFIG_DISABLE_SCAN BIT(0) +#define PPKB_SYS_SMBUS_COMMAND 0x21 +#define PPKB_SYS_SMBUS_DATA 0x22 +#define PPKB_SYS_COMMAND 0x23 +#define PPKB_SYS_COMMAND_SMBUS_READ 0x91 +#define PPKB_SYS_COMMAND_SMBUS_WRITE 0xa1 #define PPKB_ROWS 6 #define PPKB_COLS 12 @@ -132,6 +138,7 @@ static const struct matrix_keymap_data ppkb_keymap_data = { }; struct pinephone_keyboard { + struct i2c_adapter adapter; struct input_dev *input; u8 buf[2][PPKB_BUF_LEN]; u8 crc_table[CRC8_TABLE_SIZE]; @@ -140,6 +147,57 @@ struct pinephone_keyboard { bool fn_pressed; }; +static int ppkb_adap_smbus_xfer(struct i2c_adapter *adap, u16 addr, + unsigned short flags, char read_write, + u8 command, int size, + union i2c_smbus_data *data) +{ + struct i2c_client *client = adap->algo_data; + u8 buf[3]; + int ret; + + buf[0] = command; + buf[1] = data->byte; + buf[2] = read_write == I2C_SMBUS_READ ? PPKB_SYS_COMMAND_SMBUS_READ + : PPKB_SYS_COMMAND_SMBUS_WRITE; + + ret = i2c_smbus_write_i2c_block_data(client, PPKB_SYS_SMBUS_COMMAND, + sizeof(buf), buf); + if (ret) + return ret; + + /* Read back the command status until it passes or fails. */ + do { + usleep_range(300, 500); + ret = i2c_smbus_read_byte_data(client, PPKB_SYS_COMMAND); + } while (ret == buf[2]); + if (ret < 0) + return ret; + /* Commands return 0x00 on success and 0xff on failure. */ + if (ret) + return -EIO; + + if (read_write == I2C_SMBUS_READ) { + ret = i2c_smbus_read_byte_data(client, PPKB_SYS_SMBUS_DATA); + if (ret < 0) + return ret; + + data->byte = ret; + } + + return 0; +} + +static u32 ppkg_adap_functionality(struct i2c_adapter *adap) +{ + return I2C_FUNC_SMBUS_BYTE_DATA; +} + +static const struct i2c_algorithm ppkb_adap_algo = { + .smbus_xfer = ppkb_adap_smbus_xfer, + .functionality = ppkg_adap_functionality, +}; + static void ppkb_update(struct i2c_client *client) { struct pinephone_keyboard *ppkb = i2c_get_clientdata(client); @@ -266,6 +324,7 @@ static int ppkb_probe(struct i2c_client *client) struct pinephone_keyboard *ppkb; struct regulator *vbat_supply; u8 info[PPKB_MATRIX_SIZE + 1]; + struct device_node *i2c_bus; int ret; vbat_supply = devm_regulator_get(dev, "vbat"); @@ -311,6 +370,20 @@ static int ppkb_probe(struct i2c_client *client) i2c_set_clientdata(client, ppkb); + i2c_bus = of_get_child_by_name(dev->of_node, "i2c"); + if (i2c_bus) { + ppkb->adapter.owner = THIS_MODULE; + ppkb->adapter.algo = &ppkb_adap_algo; + ppkb->adapter.algo_data = client; + ppkb->adapter.dev.parent = dev; + ppkb->adapter.dev.of_node = i2c_bus; + strscpy(ppkb->adapter.name, DRV_NAME, sizeof(ppkb->adapter.name)); + + ret = devm_i2c_add_adapter(dev, &ppkb->adapter); + if (ret) + return dev_err_probe(dev, ret, "Failed to add I2C adapter\n"); + } + crc8_populate_msb(ppkb->crc_table, PPKB_CRC8_POLYNOMIAL); ppkb->input = devm_input_allocate_device(dev); -- 2.35.1 ^ permalink raw reply related [flat|nested] 6+ messages in thread
* [PATCH v3 4/4] [DO NOT MERGE] arm64: dts: allwinner: pinephone: Add keyboard 2022-04-24 16:04 [PATCH v3 0/4] Pine64 PinePhone keyboard support Samuel Holland ` (2 preceding siblings ...) 2022-04-24 16:04 ` [PATCH v3 3/4] Input: pinephone-keyboard - Support the proxied I2C bus Samuel Holland @ 2022-04-24 16:04 ` Samuel Holland 3 siblings, 0 replies; 6+ messages in thread From: Samuel Holland @ 2022-04-24 16:04 UTC (permalink / raw) To: Dmitry Torokhov, linux-input Cc: Rob Herring, Ondrej Jirman, devicetree, linux-kernel, Krzysztof Kozlowski, Samuel Holland The official PinePhone keyboard accessory connects to the phone's POGO pins for I2C and interrupts. It has an Injoinic IP5209 power bank IC connected to the keyboard's internal I2C bus. Signed-off-by: Samuel Holland <samuel@sholland.org> --- Changes in v3: - Rename i2c-bus to i2c .../dts/allwinner/sun50i-a64-pinephone.dtsi | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/arch/arm64/boot/dts/allwinner/sun50i-a64-pinephone.dtsi b/arch/arm64/boot/dts/allwinner/sun50i-a64-pinephone.dtsi index 87847116ab6d..1d757cce246a 100644 --- a/arch/arm64/boot/dts/allwinner/sun50i-a64-pinephone.dtsi +++ b/arch/arm64/boot/dts/allwinner/sun50i-a64-pinephone.dtsi @@ -208,6 +208,24 @@ accelerometer@68 { /* Connected to pogo pins (external spring based pinheader for user addons) */ &i2c2 { status = "okay"; + + keyboard@15 { + compatible = "pine64,pinephone-keyboard"; + reg = <0x15>; + interrupt-parent = <&r_pio>; + interrupts = <0 12 IRQ_TYPE_EDGE_FALLING>; /* PL12 */ + wakeup-source; + + i2c { + #address-cells = <1>; + #size-cells = <0>; + + charger@75 { + compatible = "injoinic,ip5209"; + reg = <0x75>; + }; + }; + }; }; &lradc { -- 2.35.1 ^ permalink raw reply related [flat|nested] 6+ messages in thread
end of thread, other threads:[~2022-04-25 17:52 UTC | newest] Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2022-04-24 16:04 [PATCH v3 0/4] Pine64 PinePhone keyboard support Samuel Holland 2022-04-24 16:04 ` [PATCH v3 1/4] dt-bindings: input: Add the PinePhone keyboard binding Samuel Holland 2022-04-25 17:52 ` Krzysztof Kozlowski 2022-04-24 16:04 ` [PATCH v3 2/4] Input: pinephone-keyboard - Add PinePhone keyboard driver Samuel Holland 2022-04-24 16:04 ` [PATCH v3 3/4] Input: pinephone-keyboard - Support the proxied I2C bus Samuel Holland 2022-04-24 16:04 ` [PATCH v3 4/4] [DO NOT MERGE] arm64: dts: allwinner: pinephone: Add keyboard Samuel Holland
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