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bd72c996b7
* sunxi-6.0: initial state: add megous patches to series * sunxi-6.0: Switch to v6.0.1 * wifi: Limit the version 6.0 for Realtek 88x2cs chipsets * Adjust kernel configs * Remove not needed patches * Adjust broken patches Co-authored-by: Igor <igor@armbian.com>
140 lines
4.2 KiB
Diff
140 lines
4.2 KiB
Diff
From 85b2452a726f5073a61cddceb3581bcd133da051 Mon Sep 17 00:00:00 2001
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From: Samuel Holland <samuel@sholland.org>
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Date: Sat, 29 Jan 2022 17:00:41 -0600
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Subject: [PATCH 368/486] Input: pinephone-keyboard - Support the proxied I2C
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bus
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The PinePhone keyboard case contains a battery managed by an integrated
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power bank IC. The power bank IC communicates over I2C, and the keyboard
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MCU firmware provides an interface to read and write its registers.
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Let's use this interface to implement a SMBus adapter, so we can reuse
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the driver for the power bank IC.
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Signed-off-by: Samuel Holland <samuel@sholland.org>
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---
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drivers/input/keyboard/pinephone-keyboard.c | 73 +++++++++++++++++++++
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1 file changed, 73 insertions(+)
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diff --git a/drivers/input/keyboard/pinephone-keyboard.c b/drivers/input/keyboard/pinephone-keyboard.c
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index 8065bc3e1..7d2e16e58 100644
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--- a/drivers/input/keyboard/pinephone-keyboard.c
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+++ b/drivers/input/keyboard/pinephone-keyboard.c
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@@ -3,6 +3,7 @@
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// Copyright (C) 2021-2022 Samuel Holland <samuel@sholland.org>
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#include <linux/crc8.h>
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+#include <linux/delay.h>
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#include <linux/i2c.h>
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#include <linux/input/matrix_keypad.h>
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#include <linux/interrupt.h>
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@@ -23,6 +24,11 @@
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#define PPKB_SCAN_DATA 0x08
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#define PPKB_SYS_CONFIG 0x20
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#define PPKB_SYS_CONFIG_DISABLE_SCAN BIT(0)
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+#define PPKB_SYS_SMBUS_COMMAND 0x21
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+#define PPKB_SYS_SMBUS_DATA 0x22
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+#define PPKB_SYS_COMMAND 0x23
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+#define PPKB_SYS_COMMAND_SMBUS_READ 0x91
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+#define PPKB_SYS_COMMAND_SMBUS_WRITE 0xa1
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#define PPKB_DEFAULT_KEYMAP_ROWS 6
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#define PPKB_DEFAULT_KEYMAP_COLS 12
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@@ -132,6 +138,7 @@ static const struct matrix_keymap_data ppkb_default_keymap_data = {
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};
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struct pinephone_keyboard {
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+ struct i2c_adapter adapter;
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struct input_dev *input;
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unsigned short *fn_keymap;
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u8 crc_table[CRC8_TABLE_SIZE];
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@@ -143,6 +150,57 @@ struct pinephone_keyboard {
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u8 buf[];
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};
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+static int ppkb_adap_smbus_xfer(struct i2c_adapter *adap, u16 addr,
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+ unsigned short flags, char read_write,
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+ u8 command, int size,
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+ union i2c_smbus_data *data)
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+{
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+ struct i2c_client *client = adap->algo_data;
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+ u8 buf[3];
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+ int ret;
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+
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+ buf[0] = command;
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+ buf[1] = data->byte;
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+ buf[2] = read_write == I2C_SMBUS_READ ? PPKB_SYS_COMMAND_SMBUS_READ
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+ : PPKB_SYS_COMMAND_SMBUS_WRITE;
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+
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+ ret = i2c_smbus_write_i2c_block_data(client, PPKB_SYS_SMBUS_COMMAND,
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+ sizeof(buf), buf);
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+ if (ret)
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+ return ret;
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+
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+ /* Read back the command status until it passes or fails. */
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+ do {
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+ usleep_range(300, 500);
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+ ret = i2c_smbus_read_byte_data(client, PPKB_SYS_COMMAND);
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+ } while (ret == buf[2]);
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+ if (ret < 0)
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+ return ret;
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+ /* Commands return 0x00 on success and 0xff on failure. */
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+ if (ret)
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+ return -EIO;
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+
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+ if (read_write == I2C_SMBUS_READ) {
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+ ret = i2c_smbus_read_byte_data(client, PPKB_SYS_SMBUS_DATA);
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+ if (ret < 0)
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+ return ret;
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+
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+ data->byte = ret;
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+ }
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+
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+ return 0;
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+}
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+
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+static u32 ppkg_adap_functionality(struct i2c_adapter *adap)
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+{
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+ return I2C_FUNC_SMBUS_BYTE_DATA;
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+}
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+
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+static const struct i2c_algorithm ppkb_adap_algo = {
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+ .smbus_xfer = ppkb_adap_smbus_xfer,
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+ .functionality = ppkg_adap_functionality,
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+};
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+
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static int ppkb_set_scan(struct i2c_client *client, bool enable)
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{
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struct device *dev = &client->dev;
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@@ -265,6 +323,7 @@ static int ppkb_probe(struct i2c_client *client)
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unsigned int map_rows, map_cols;
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struct pinephone_keyboard *ppkb;
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u8 info[PPKB_MATRIX_SIZE + 1];
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+ struct device_node *i2c_bus;
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int ret;
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ret = i2c_smbus_read_i2c_block_data(client, 0, sizeof(info), info);
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@@ -312,6 +371,20 @@ static int ppkb_probe(struct i2c_client *client)
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i2c_set_clientdata(client, ppkb);
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+ i2c_bus = of_get_child_by_name(dev->of_node, "i2c-bus");
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+ if (i2c_bus) {
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+ ppkb->adapter.owner = THIS_MODULE;
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+ ppkb->adapter.algo = &ppkb_adap_algo;
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+ ppkb->adapter.algo_data = client;
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+ ppkb->adapter.dev.parent = dev;
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+ ppkb->adapter.dev.of_node = i2c_bus;
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+ strscpy(ppkb->adapter.name, DRV_NAME, sizeof(ppkb->adapter.name));
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+
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+ ret = devm_i2c_add_adapter(dev, &ppkb->adapter);
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+ if (ret)
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+ return dev_err_probe(dev, ret, "Failed to add I2C adapter\n");
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+ }
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+
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crc8_populate_msb(ppkb->crc_table, PPKB_CRC8_POLYNOMIAL);
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ppkb->row_shift = get_count_order(map_cols);
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ppkb->rows = map_rows;
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--
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2.35.3
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