diff options
Diffstat (limited to 'drivers/platform/chrome/cros_ec_lpc_reg.c')
| -rw-r--r-- | drivers/platform/chrome/cros_ec_lpc_reg.c | 134 |
1 files changed, 0 insertions, 134 deletions
diff --git a/drivers/platform/chrome/cros_ec_lpc_reg.c b/drivers/platform/chrome/cros_ec_lpc_reg.c deleted file mode 100644 index fc23d535c404..000000000000 --- a/drivers/platform/chrome/cros_ec_lpc_reg.c +++ /dev/null @@ -1,134 +0,0 @@ -/* - * cros_ec_lpc_reg - LPC access to the Chrome OS Embedded Controller - * - * Copyright (C) 2016 Google, Inc - * - * This software is licensed under the terms of the GNU General Public - * License version 2, as published by the Free Software Foundation, and - * may be copied, distributed, and modified under those terms. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * This driver uses the Chrome OS EC byte-level message-based protocol for - * communicating the keyboard state (which keys are pressed) from a keyboard EC - * to the AP over some bus (such as i2c, lpc, spi). The EC does debouncing, - * but everything else (including deghosting) is done here. The main - * motivation for this is to keep the EC firmware as simple as possible, since - * it cannot be easily upgraded and EC flash/IRAM space is relatively - * expensive. - */ - -#include <linux/io.h> -#include <linux/mfd/cros_ec.h> -#include <linux/mfd/cros_ec_commands.h> - -#include "cros_ec_lpc_mec.h" - -static u8 lpc_read_bytes(unsigned int offset, unsigned int length, u8 *dest) -{ - int i; - int sum = 0; - - for (i = 0; i < length; ++i) { - dest[i] = inb(offset + i); - sum += dest[i]; - } - - /* Return checksum of all bytes read */ - return sum; -} - -static u8 lpc_write_bytes(unsigned int offset, unsigned int length, u8 *msg) -{ - int i; - int sum = 0; - - for (i = 0; i < length; ++i) { - outb(msg[i], offset + i); - sum += msg[i]; - } - - /* Return checksum of all bytes written */ - return sum; -} - -#ifdef CONFIG_CROS_EC_LPC_MEC - -u8 cros_ec_lpc_read_bytes(unsigned int offset, unsigned int length, u8 *dest) -{ - if (length == 0) - return 0; - - /* Access desired range through EMI interface */ - if (offset >= MEC_EMI_RANGE_START && offset <= MEC_EMI_RANGE_END) { - /* Ensure we don't straddle EMI region */ - if (WARN_ON(offset + length - 1 > MEC_EMI_RANGE_END)) - return 0; - - return cros_ec_lpc_io_bytes_mec(MEC_IO_READ, offset, length, - dest); - } - - if (WARN_ON(offset + length > MEC_EMI_RANGE_START && - offset < MEC_EMI_RANGE_START)) - return 0; - - return lpc_read_bytes(offset, length, dest); -} - -u8 cros_ec_lpc_write_bytes(unsigned int offset, unsigned int length, u8 *msg) -{ - if (length == 0) - return 0; - - /* Access desired range through EMI interface */ - if (offset >= MEC_EMI_RANGE_START && offset <= MEC_EMI_RANGE_END) { - /* Ensure we don't straddle EMI region */ - if (WARN_ON(offset + length - 1 > MEC_EMI_RANGE_END)) - return 0; - - return cros_ec_lpc_io_bytes_mec(MEC_IO_WRITE, offset, length, - msg); - } - - if (WARN_ON(offset + length > MEC_EMI_RANGE_START && - offset < MEC_EMI_RANGE_START)) - return 0; - - return lpc_write_bytes(offset, length, msg); -} - -void cros_ec_lpc_reg_init(void) -{ - cros_ec_lpc_mec_init(); -} - -void cros_ec_lpc_reg_destroy(void) -{ - cros_ec_lpc_mec_destroy(); -} - -#else /* CONFIG_CROS_EC_LPC_MEC */ - -u8 cros_ec_lpc_read_bytes(unsigned int offset, unsigned int length, u8 *dest) -{ - return lpc_read_bytes(offset, length, dest); -} - -u8 cros_ec_lpc_write_bytes(unsigned int offset, unsigned int length, u8 *msg) -{ - return lpc_write_bytes(offset, length, msg); -} - -void cros_ec_lpc_reg_init(void) -{ -} - -void cros_ec_lpc_reg_destroy(void) -{ -} - -#endif /* CONFIG_CROS_EC_LPC_MEC */ |