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733 lines
19 KiB
C
733 lines
19 KiB
C
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// SPDX-License-Identifier: GPL-2.0+
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/*
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* GPIO interface for Winbond Super I/O chips
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* Currently, only W83627UHG (Nuvoton NCT6627UD) is supported.
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*
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* Author: Maciej S. Szmigiero <mail@maciej.szmigiero.name>
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/gpio/driver.h>
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#include <linux/ioport.h>
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#include <linux/isa.h>
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#include <linux/module.h>
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#define WB_GPIO_DRIVER_NAME KBUILD_MODNAME
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#define WB_SIO_BASE 0x2e
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#define WB_SIO_BASE_HIGH 0x4e
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#define WB_SIO_EXT_ENTER_KEY 0x87
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#define WB_SIO_EXT_EXIT_KEY 0xaa
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/* global chip registers */
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#define WB_SIO_REG_LOGICAL 0x07
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#define WB_SIO_REG_CHIP_MSB 0x20
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#define WB_SIO_REG_CHIP_LSB 0x21
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#define WB_SIO_CHIP_ID_W83627UHG 0xa230
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#define WB_SIO_CHIP_ID_W83627UHG_MASK GENMASK(15, 4)
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#define WB_SIO_REG_DPD 0x22
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#define WB_SIO_REG_DPD_UARTA 4
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#define WB_SIO_REG_DPD_UARTB 5
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#define WB_SIO_REG_IDPD 0x23
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#define WB_SIO_REG_IDPD_UARTC 4
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#define WB_SIO_REG_IDPD_UARTD 5
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#define WB_SIO_REG_IDPD_UARTE 6
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#define WB_SIO_REG_IDPD_UARTF 7
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#define WB_SIO_REG_GLOBAL_OPT 0x24
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#define WB_SIO_REG_GO_ENFDC 1
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#define WB_SIO_REG_OVTGPIO3456 0x29
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#define WB_SIO_REG_OG3456_G3PP 3
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#define WB_SIO_REG_OG3456_G4PP 4
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#define WB_SIO_REG_OG3456_G5PP 5
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#define WB_SIO_REG_OG3456_G6PP 7
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#define WB_SIO_REG_I2C_PS 0x2a
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#define WB_SIO_REG_I2CPS_I2CFS 1
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#define WB_SIO_REG_GPIO1_MF 0x2c
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#define WB_SIO_REG_G1MF_G1PP 6
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#define WB_SIO_REG_G1MF_G2PP 7
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#define WB_SIO_REG_G1MF_FS_MASK GENMASK(1, 0)
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#define WB_SIO_REG_G1MF_FS_IR_OFF 0
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#define WB_SIO_REG_G1MF_FS_IR 1
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#define WB_SIO_REG_G1MF_FS_GPIO1 2
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#define WB_SIO_REG_G1MF_FS_UARTB 3
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/* not an actual device number, just a value meaning 'no device' */
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#define WB_SIO_DEV_NONE 0xff
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/* registers with offsets >= 0x30 are specific for a particular device */
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/* UART B logical device */
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#define WB_SIO_DEV_UARTB 0x03
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#define WB_SIO_UARTB_REG_ENABLE 0x30
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#define WB_SIO_UARTB_ENABLE_ON 0
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/* UART C logical device */
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#define WB_SIO_DEV_UARTC 0x06
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#define WB_SIO_UARTC_REG_ENABLE 0x30
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#define WB_SIO_UARTC_ENABLE_ON 0
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/* GPIO3, GPIO4 logical device */
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#define WB_SIO_DEV_GPIO34 0x07
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#define WB_SIO_GPIO34_REG_ENABLE 0x30
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#define WB_SIO_GPIO34_ENABLE_3 0
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#define WB_SIO_GPIO34_ENABLE_4 1
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#define WB_SIO_GPIO34_REG_IO3 0xe0
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#define WB_SIO_GPIO34_REG_DATA3 0xe1
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#define WB_SIO_GPIO34_REG_INV3 0xe2
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#define WB_SIO_GPIO34_REG_IO4 0xe4
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#define WB_SIO_GPIO34_REG_DATA4 0xe5
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#define WB_SIO_GPIO34_REG_INV4 0xe6
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/* WDTO, PLED, GPIO5, GPIO6 logical device */
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#define WB_SIO_DEV_WDGPIO56 0x08
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#define WB_SIO_WDGPIO56_REG_ENABLE 0x30
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#define WB_SIO_WDGPIO56_ENABLE_5 1
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#define WB_SIO_WDGPIO56_ENABLE_6 2
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#define WB_SIO_WDGPIO56_REG_IO5 0xe0
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#define WB_SIO_WDGPIO56_REG_DATA5 0xe1
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#define WB_SIO_WDGPIO56_REG_INV5 0xe2
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#define WB_SIO_WDGPIO56_REG_IO6 0xe4
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#define WB_SIO_WDGPIO56_REG_DATA6 0xe5
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#define WB_SIO_WDGPIO56_REG_INV6 0xe6
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/* GPIO1, GPIO2, SUSLED logical device */
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#define WB_SIO_DEV_GPIO12 0x09
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#define WB_SIO_GPIO12_REG_ENABLE 0x30
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#define WB_SIO_GPIO12_ENABLE_1 0
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#define WB_SIO_GPIO12_ENABLE_2 1
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#define WB_SIO_GPIO12_REG_IO1 0xe0
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#define WB_SIO_GPIO12_REG_DATA1 0xe1
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#define WB_SIO_GPIO12_REG_INV1 0xe2
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#define WB_SIO_GPIO12_REG_IO2 0xe4
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#define WB_SIO_GPIO12_REG_DATA2 0xe5
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#define WB_SIO_GPIO12_REG_INV2 0xe6
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/* UART D logical device */
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#define WB_SIO_DEV_UARTD 0x0d
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#define WB_SIO_UARTD_REG_ENABLE 0x30
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#define WB_SIO_UARTD_ENABLE_ON 0
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/* UART E logical device */
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#define WB_SIO_DEV_UARTE 0x0e
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#define WB_SIO_UARTE_REG_ENABLE 0x30
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#define WB_SIO_UARTE_ENABLE_ON 0
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/*
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* for a description what a particular field of this struct means please see
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* a description of the relevant module parameter at the bottom of this file
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*/
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struct winbond_gpio_params {
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unsigned long base;
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unsigned long gpios;
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unsigned long ppgpios;
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unsigned long odgpios;
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bool pledgpio;
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bool beepgpio;
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bool i2cgpio;
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};
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static struct winbond_gpio_params params;
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static int winbond_sio_enter(unsigned long base)
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{
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if (!request_muxed_region(base, 2, WB_GPIO_DRIVER_NAME))
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return -EBUSY;
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/*
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* datasheet says two successive writes of the "key" value are needed
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* in order for chip to enter the "Extended Function Mode"
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*/
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outb(WB_SIO_EXT_ENTER_KEY, base);
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outb(WB_SIO_EXT_ENTER_KEY, base);
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return 0;
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}
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static void winbond_sio_select_logical(unsigned long base, u8 dev)
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{
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outb(WB_SIO_REG_LOGICAL, base);
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outb(dev, base + 1);
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}
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static void winbond_sio_leave(unsigned long base)
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{
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outb(WB_SIO_EXT_EXIT_KEY, base);
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release_region(base, 2);
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}
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static void winbond_sio_reg_write(unsigned long base, u8 reg, u8 data)
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{
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outb(reg, base);
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outb(data, base + 1);
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}
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static u8 winbond_sio_reg_read(unsigned long base, u8 reg)
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{
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outb(reg, base);
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return inb(base + 1);
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}
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static void winbond_sio_reg_bset(unsigned long base, u8 reg, u8 bit)
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{
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u8 val;
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val = winbond_sio_reg_read(base, reg);
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val |= BIT(bit);
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winbond_sio_reg_write(base, reg, val);
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}
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static void winbond_sio_reg_bclear(unsigned long base, u8 reg, u8 bit)
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{
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u8 val;
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val = winbond_sio_reg_read(base, reg);
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val &= ~BIT(bit);
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winbond_sio_reg_write(base, reg, val);
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}
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static bool winbond_sio_reg_btest(unsigned long base, u8 reg, u8 bit)
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{
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return winbond_sio_reg_read(base, reg) & BIT(bit);
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}
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/**
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* struct winbond_gpio_port_conflict - possibly conflicting device information
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* @name: device name (NULL means no conflicting device defined)
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* @dev: Super I/O logical device number where the testreg register
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* is located (or WB_SIO_DEV_NONE - don't select any
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* logical device)
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* @testreg: register number where the testbit bit is located
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* @testbit: index of a bit to check whether an actual conflict exists
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* @warnonly: if set then a conflict isn't fatal (just warn about it),
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* otherwise disable the particular GPIO port if a conflict
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* is detected
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*/
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struct winbond_gpio_port_conflict {
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const char *name;
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u8 dev;
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u8 testreg;
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u8 testbit;
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bool warnonly;
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};
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/**
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* struct winbond_gpio_info - information about a particular GPIO port (device)
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* @dev: Super I/O logical device number of the registers
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* specified below
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* @enablereg: port enable bit register number
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* @enablebit: index of a port enable bit
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* @outputreg: output driver mode bit register number
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* @outputppbit: index of a push-pull output driver mode bit
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* @ioreg: data direction register number
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* @invreg: pin data inversion register number
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* @datareg: pin data register number
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* @conflict: description of a device that possibly conflicts with
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* this port
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*/
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struct winbond_gpio_info {
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u8 dev;
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u8 enablereg;
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u8 enablebit;
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u8 outputreg;
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u8 outputppbit;
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u8 ioreg;
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u8 invreg;
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u8 datareg;
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struct winbond_gpio_port_conflict conflict;
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};
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static const struct winbond_gpio_info winbond_gpio_infos[6] = {
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{ /* 0 */
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.dev = WB_SIO_DEV_GPIO12,
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.enablereg = WB_SIO_GPIO12_REG_ENABLE,
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.enablebit = WB_SIO_GPIO12_ENABLE_1,
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.outputreg = WB_SIO_REG_GPIO1_MF,
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.outputppbit = WB_SIO_REG_G1MF_G1PP,
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.ioreg = WB_SIO_GPIO12_REG_IO1,
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.invreg = WB_SIO_GPIO12_REG_INV1,
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.datareg = WB_SIO_GPIO12_REG_DATA1,
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.conflict = {
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.name = "UARTB",
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.dev = WB_SIO_DEV_UARTB,
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.testreg = WB_SIO_UARTB_REG_ENABLE,
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.testbit = WB_SIO_UARTB_ENABLE_ON,
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.warnonly = true
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}
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},
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{ /* 1 */
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.dev = WB_SIO_DEV_GPIO12,
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.enablereg = WB_SIO_GPIO12_REG_ENABLE,
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.enablebit = WB_SIO_GPIO12_ENABLE_2,
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.outputreg = WB_SIO_REG_GPIO1_MF,
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.outputppbit = WB_SIO_REG_G1MF_G2PP,
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.ioreg = WB_SIO_GPIO12_REG_IO2,
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.invreg = WB_SIO_GPIO12_REG_INV2,
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.datareg = WB_SIO_GPIO12_REG_DATA2
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/* special conflict handling so doesn't use conflict data */
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},
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{ /* 2 */
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.dev = WB_SIO_DEV_GPIO34,
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.enablereg = WB_SIO_GPIO34_REG_ENABLE,
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.enablebit = WB_SIO_GPIO34_ENABLE_3,
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.outputreg = WB_SIO_REG_OVTGPIO3456,
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.outputppbit = WB_SIO_REG_OG3456_G3PP,
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.ioreg = WB_SIO_GPIO34_REG_IO3,
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.invreg = WB_SIO_GPIO34_REG_INV3,
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.datareg = WB_SIO_GPIO34_REG_DATA3,
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.conflict = {
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.name = "UARTC",
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.dev = WB_SIO_DEV_UARTC,
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.testreg = WB_SIO_UARTC_REG_ENABLE,
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.testbit = WB_SIO_UARTC_ENABLE_ON,
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.warnonly = true
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}
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},
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{ /* 3 */
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.dev = WB_SIO_DEV_GPIO34,
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.enablereg = WB_SIO_GPIO34_REG_ENABLE,
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.enablebit = WB_SIO_GPIO34_ENABLE_4,
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.outputreg = WB_SIO_REG_OVTGPIO3456,
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.outputppbit = WB_SIO_REG_OG3456_G4PP,
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.ioreg = WB_SIO_GPIO34_REG_IO4,
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.invreg = WB_SIO_GPIO34_REG_INV4,
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.datareg = WB_SIO_GPIO34_REG_DATA4,
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.conflict = {
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.name = "UARTD",
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.dev = WB_SIO_DEV_UARTD,
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.testreg = WB_SIO_UARTD_REG_ENABLE,
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.testbit = WB_SIO_UARTD_ENABLE_ON,
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.warnonly = true
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}
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},
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{ /* 4 */
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.dev = WB_SIO_DEV_WDGPIO56,
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.enablereg = WB_SIO_WDGPIO56_REG_ENABLE,
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.enablebit = WB_SIO_WDGPIO56_ENABLE_5,
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.outputreg = WB_SIO_REG_OVTGPIO3456,
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.outputppbit = WB_SIO_REG_OG3456_G5PP,
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.ioreg = WB_SIO_WDGPIO56_REG_IO5,
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.invreg = WB_SIO_WDGPIO56_REG_INV5,
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.datareg = WB_SIO_WDGPIO56_REG_DATA5,
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.conflict = {
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.name = "UARTE",
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.dev = WB_SIO_DEV_UARTE,
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.testreg = WB_SIO_UARTE_REG_ENABLE,
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.testbit = WB_SIO_UARTE_ENABLE_ON,
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.warnonly = true
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}
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},
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{ /* 5 */
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.dev = WB_SIO_DEV_WDGPIO56,
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.enablereg = WB_SIO_WDGPIO56_REG_ENABLE,
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.enablebit = WB_SIO_WDGPIO56_ENABLE_6,
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.outputreg = WB_SIO_REG_OVTGPIO3456,
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.outputppbit = WB_SIO_REG_OG3456_G6PP,
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.ioreg = WB_SIO_WDGPIO56_REG_IO6,
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.invreg = WB_SIO_WDGPIO56_REG_INV6,
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.datareg = WB_SIO_WDGPIO56_REG_DATA6,
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.conflict = {
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.name = "FDC",
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.dev = WB_SIO_DEV_NONE,
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.testreg = WB_SIO_REG_GLOBAL_OPT,
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.testbit = WB_SIO_REG_GO_ENFDC,
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.warnonly = false
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}
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}
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};
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/* returns whether changing a pin is allowed */
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static bool winbond_gpio_get_info(unsigned int *gpio_num,
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const struct winbond_gpio_info **info)
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{
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bool allow_changing = true;
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unsigned long i;
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for_each_set_bit(i, ¶ms.gpios, BITS_PER_LONG) {
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if (*gpio_num < 8)
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break;
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*gpio_num -= 8;
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}
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*info = &winbond_gpio_infos[i];
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/*
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* GPIO2 (the second port) shares some pins with a basic PC
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* functionality, which is very likely controlled by the firmware.
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* Don't allow changing these pins by default.
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*/
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if (i == 1) {
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if (*gpio_num == 0 && !params.pledgpio)
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allow_changing = false;
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else if (*gpio_num == 1 && !params.beepgpio)
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allow_changing = false;
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else if ((*gpio_num == 5 || *gpio_num == 6) && !params.i2cgpio)
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allow_changing = false;
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}
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return allow_changing;
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}
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static int winbond_gpio_get(struct gpio_chip *gc, unsigned int offset)
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{
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unsigned long *base = gpiochip_get_data(gc);
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const struct winbond_gpio_info *info;
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bool val;
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winbond_gpio_get_info(&offset, &info);
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||
|
val = winbond_sio_enter(*base);
|
||
|
if (val)
|
||
|
return val;
|
||
|
|
||
|
winbond_sio_select_logical(*base, info->dev);
|
||
|
|
||
|
val = winbond_sio_reg_btest(*base, info->datareg, offset);
|
||
|
if (winbond_sio_reg_btest(*base, info->invreg, offset))
|
||
|
val = !val;
|
||
|
|
||
|
winbond_sio_leave(*base);
|
||
|
|
||
|
return val;
|
||
|
}
|
||
|
|
||
|
static int winbond_gpio_direction_in(struct gpio_chip *gc, unsigned int offset)
|
||
|
{
|
||
|
unsigned long *base = gpiochip_get_data(gc);
|
||
|
const struct winbond_gpio_info *info;
|
||
|
int ret;
|
||
|
|
||
|
if (!winbond_gpio_get_info(&offset, &info))
|
||
|
return -EACCES;
|
||
|
|
||
|
ret = winbond_sio_enter(*base);
|
||
|
if (ret)
|
||
|
return ret;
|
||
|
|
||
|
winbond_sio_select_logical(*base, info->dev);
|
||
|
|
||
|
winbond_sio_reg_bset(*base, info->ioreg, offset);
|
||
|
|
||
|
winbond_sio_leave(*base);
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static int winbond_gpio_direction_out(struct gpio_chip *gc,
|
||
|
unsigned int offset,
|
||
|
int val)
|
||
|
{
|
||
|
unsigned long *base = gpiochip_get_data(gc);
|
||
|
const struct winbond_gpio_info *info;
|
||
|
int ret;
|
||
|
|
||
|
if (!winbond_gpio_get_info(&offset, &info))
|
||
|
return -EACCES;
|
||
|
|
||
|
ret = winbond_sio_enter(*base);
|
||
|
if (ret)
|
||
|
return ret;
|
||
|
|
||
|
winbond_sio_select_logical(*base, info->dev);
|
||
|
|
||
|
winbond_sio_reg_bclear(*base, info->ioreg, offset);
|
||
|
|
||
|
if (winbond_sio_reg_btest(*base, info->invreg, offset))
|
||
|
val = !val;
|
||
|
|
||
|
if (val)
|
||
|
winbond_sio_reg_bset(*base, info->datareg, offset);
|
||
|
else
|
||
|
winbond_sio_reg_bclear(*base, info->datareg, offset);
|
||
|
|
||
|
winbond_sio_leave(*base);
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static void winbond_gpio_set(struct gpio_chip *gc, unsigned int offset,
|
||
|
int val)
|
||
|
{
|
||
|
unsigned long *base = gpiochip_get_data(gc);
|
||
|
const struct winbond_gpio_info *info;
|
||
|
|
||
|
if (!winbond_gpio_get_info(&offset, &info))
|
||
|
return;
|
||
|
|
||
|
if (winbond_sio_enter(*base) != 0)
|
||
|
return;
|
||
|
|
||
|
winbond_sio_select_logical(*base, info->dev);
|
||
|
|
||
|
if (winbond_sio_reg_btest(*base, info->invreg, offset))
|
||
|
val = !val;
|
||
|
|
||
|
if (val)
|
||
|
winbond_sio_reg_bset(*base, info->datareg, offset);
|
||
|
else
|
||
|
winbond_sio_reg_bclear(*base, info->datareg, offset);
|
||
|
|
||
|
winbond_sio_leave(*base);
|
||
|
}
|
||
|
|
||
|
static struct gpio_chip winbond_gpio_chip = {
|
||
|
.base = -1,
|
||
|
.label = WB_GPIO_DRIVER_NAME,
|
||
|
.owner = THIS_MODULE,
|
||
|
.can_sleep = true,
|
||
|
.get = winbond_gpio_get,
|
||
|
.direction_input = winbond_gpio_direction_in,
|
||
|
.set = winbond_gpio_set,
|
||
|
.direction_output = winbond_gpio_direction_out,
|
||
|
};
|
||
|
|
||
|
static void winbond_gpio_configure_port0_pins(unsigned long base)
|
||
|
{
|
||
|
unsigned int val;
|
||
|
|
||
|
val = winbond_sio_reg_read(base, WB_SIO_REG_GPIO1_MF);
|
||
|
if ((val & WB_SIO_REG_G1MF_FS_MASK) == WB_SIO_REG_G1MF_FS_GPIO1)
|
||
|
return;
|
||
|
|
||
|
pr_warn("GPIO1 pins were connected to something else (%.2x), fixing\n",
|
||
|
val);
|
||
|
|
||
|
val &= ~WB_SIO_REG_G1MF_FS_MASK;
|
||
|
val |= WB_SIO_REG_G1MF_FS_GPIO1;
|
||
|
|
||
|
winbond_sio_reg_write(base, WB_SIO_REG_GPIO1_MF, val);
|
||
|
}
|
||
|
|
||
|
static void winbond_gpio_configure_port1_check_i2c(unsigned long base)
|
||
|
{
|
||
|
params.i2cgpio = !winbond_sio_reg_btest(base, WB_SIO_REG_I2C_PS,
|
||
|
WB_SIO_REG_I2CPS_I2CFS);
|
||
|
if (!params.i2cgpio)
|
||
|
pr_warn("disabling GPIO2.5 and GPIO2.6 as I2C is enabled\n");
|
||
|
}
|
||
|
|
||
|
static bool winbond_gpio_configure_port(unsigned long base, unsigned int idx)
|
||
|
{
|
||
|
const struct winbond_gpio_info *info = &winbond_gpio_infos[idx];
|
||
|
const struct winbond_gpio_port_conflict *conflict = &info->conflict;
|
||
|
|
||
|
/* is there a possible conflicting device defined? */
|
||
|
if (conflict->name != NULL) {
|
||
|
if (conflict->dev != WB_SIO_DEV_NONE)
|
||
|
winbond_sio_select_logical(base, conflict->dev);
|
||
|
|
||
|
if (winbond_sio_reg_btest(base, conflict->testreg,
|
||
|
conflict->testbit)) {
|
||
|
if (conflict->warnonly)
|
||
|
pr_warn("enabled GPIO%u share pins with active %s\n",
|
||
|
idx + 1, conflict->name);
|
||
|
else {
|
||
|
pr_warn("disabling GPIO%u as %s is enabled\n",
|
||
|
idx + 1, conflict->name);
|
||
|
return false;
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
|
||
|
/* GPIO1 and GPIO2 need some (additional) special handling */
|
||
|
if (idx == 0)
|
||
|
winbond_gpio_configure_port0_pins(base);
|
||
|
else if (idx == 1)
|
||
|
winbond_gpio_configure_port1_check_i2c(base);
|
||
|
|
||
|
winbond_sio_select_logical(base, info->dev);
|
||
|
|
||
|
winbond_sio_reg_bset(base, info->enablereg, info->enablebit);
|
||
|
|
||
|
if (params.ppgpios & BIT(idx))
|
||
|
winbond_sio_reg_bset(base, info->outputreg,
|
||
|
info->outputppbit);
|
||
|
else if (params.odgpios & BIT(idx))
|
||
|
winbond_sio_reg_bclear(base, info->outputreg,
|
||
|
info->outputppbit);
|
||
|
else
|
||
|
pr_notice("GPIO%u pins are %s\n", idx + 1,
|
||
|
winbond_sio_reg_btest(base, info->outputreg,
|
||
|
info->outputppbit) ?
|
||
|
"push-pull" :
|
||
|
"open drain");
|
||
|
|
||
|
return true;
|
||
|
}
|
||
|
|
||
|
static int winbond_gpio_configure(unsigned long base)
|
||
|
{
|
||
|
unsigned long i;
|
||
|
|
||
|
for_each_set_bit(i, ¶ms.gpios, BITS_PER_LONG)
|
||
|
if (!winbond_gpio_configure_port(base, i))
|
||
|
__clear_bit(i, ¶ms.gpios);
|
||
|
|
||
|
if (!params.gpios) {
|
||
|
pr_err("please use 'gpios' module parameter to select some active GPIO ports to enable\n");
|
||
|
return -EINVAL;
|
||
|
}
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static int winbond_gpio_check_chip(unsigned long base)
|
||
|
{
|
||
|
int ret;
|
||
|
unsigned int chip;
|
||
|
|
||
|
ret = winbond_sio_enter(base);
|
||
|
if (ret)
|
||
|
return ret;
|
||
|
|
||
|
chip = winbond_sio_reg_read(base, WB_SIO_REG_CHIP_MSB) << 8;
|
||
|
chip |= winbond_sio_reg_read(base, WB_SIO_REG_CHIP_LSB);
|
||
|
|
||
|
pr_notice("chip ID at %lx is %.4x\n", base, chip);
|
||
|
|
||
|
if ((chip & WB_SIO_CHIP_ID_W83627UHG_MASK) !=
|
||
|
WB_SIO_CHIP_ID_W83627UHG) {
|
||
|
pr_err("not an our chip\n");
|
||
|
ret = -ENODEV;
|
||
|
}
|
||
|
|
||
|
winbond_sio_leave(base);
|
||
|
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
static int winbond_gpio_imatch(struct device *dev, unsigned int id)
|
||
|
{
|
||
|
unsigned long gpios_rem;
|
||
|
int ret;
|
||
|
|
||
|
gpios_rem = params.gpios & ~GENMASK(ARRAY_SIZE(winbond_gpio_infos) - 1,
|
||
|
0);
|
||
|
if (gpios_rem) {
|
||
|
pr_warn("unknown ports (%lx) enabled in GPIO ports bitmask\n",
|
||
|
gpios_rem);
|
||
|
params.gpios &= ~gpios_rem;
|
||
|
}
|
||
|
|
||
|
if (params.ppgpios & params.odgpios) {
|
||
|
pr_err("some GPIO ports are set both to push-pull and open drain mode at the same time\n");
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
if (params.base != 0)
|
||
|
return winbond_gpio_check_chip(params.base) == 0;
|
||
|
|
||
|
/*
|
||
|
* if the 'base' module parameter is unset probe two chip default
|
||
|
* I/O port bases
|
||
|
*/
|
||
|
params.base = WB_SIO_BASE;
|
||
|
ret = winbond_gpio_check_chip(params.base);
|
||
|
if (ret == 0)
|
||
|
return 1;
|
||
|
if (ret != -ENODEV && ret != -EBUSY)
|
||
|
return 0;
|
||
|
|
||
|
params.base = WB_SIO_BASE_HIGH;
|
||
|
return winbond_gpio_check_chip(params.base) == 0;
|
||
|
}
|
||
|
|
||
|
static int winbond_gpio_iprobe(struct device *dev, unsigned int id)
|
||
|
{
|
||
|
int ret;
|
||
|
|
||
|
if (params.base == 0)
|
||
|
return -EINVAL;
|
||
|
|
||
|
ret = winbond_sio_enter(params.base);
|
||
|
if (ret)
|
||
|
return ret;
|
||
|
|
||
|
ret = winbond_gpio_configure(params.base);
|
||
|
|
||
|
winbond_sio_leave(params.base);
|
||
|
|
||
|
if (ret)
|
||
|
return ret;
|
||
|
|
||
|
/*
|
||
|
* Add 8 gpios for every GPIO port that was enabled in gpios
|
||
|
* module parameter (that wasn't disabled earlier in
|
||
|
* winbond_gpio_configure() & co. due to, for example, a pin conflict).
|
||
|
*/
|
||
|
winbond_gpio_chip.ngpio = hweight_long(params.gpios) * 8;
|
||
|
|
||
|
/*
|
||
|
* GPIO6 port has only 5 pins, so if it is enabled we have to adjust
|
||
|
* the total count appropriately
|
||
|
*/
|
||
|
if (params.gpios & BIT(5))
|
||
|
winbond_gpio_chip.ngpio -= (8 - 5);
|
||
|
|
||
|
winbond_gpio_chip.parent = dev;
|
||
|
|
||
|
return devm_gpiochip_add_data(dev, &winbond_gpio_chip, ¶ms.base);
|
||
|
}
|
||
|
|
||
|
static struct isa_driver winbond_gpio_idriver = {
|
||
|
.driver = {
|
||
|
.name = WB_GPIO_DRIVER_NAME,
|
||
|
},
|
||
|
.match = winbond_gpio_imatch,
|
||
|
.probe = winbond_gpio_iprobe,
|
||
|
};
|
||
|
|
||
|
module_isa_driver(winbond_gpio_idriver, 1);
|
||
|
|
||
|
module_param_named(base, params.base, ulong, 0444);
|
||
|
MODULE_PARM_DESC(base,
|
||
|
"I/O port base (when unset - probe chip default ones)");
|
||
|
|
||
|
/* This parameter sets which GPIO devices (ports) we enable */
|
||
|
module_param_named(gpios, params.gpios, ulong, 0444);
|
||
|
MODULE_PARM_DESC(gpios,
|
||
|
"bitmask of GPIO ports to enable (bit 0 - GPIO1, bit 1 - GPIO2, etc.");
|
||
|
|
||
|
/*
|
||
|
* These two parameters below set how we configure GPIO ports output drivers.
|
||
|
* It can't be a one bitmask since we need three values per port: push-pull,
|
||
|
* open-drain and keep as-is (this is the default).
|
||
|
*/
|
||
|
module_param_named(ppgpios, params.ppgpios, ulong, 0444);
|
||
|
MODULE_PARM_DESC(ppgpios,
|
||
|
"bitmask of GPIO ports to set to push-pull mode (bit 0 - GPIO1, bit 1 - GPIO2, etc.");
|
||
|
|
||
|
module_param_named(odgpios, params.odgpios, ulong, 0444);
|
||
|
MODULE_PARM_DESC(odgpios,
|
||
|
"bitmask of GPIO ports to set to open drain mode (bit 0 - GPIO1, bit 1 - GPIO2, etc.");
|
||
|
|
||
|
/*
|
||
|
* GPIO2.0 and GPIO2.1 control a basic PC functionality that we
|
||
|
* don't allow tinkering with by default (it is very likely that the
|
||
|
* firmware owns these pins).
|
||
|
* These two parameters below allow overriding these prohibitions.
|
||
|
*/
|
||
|
module_param_named(pledgpio, params.pledgpio, bool, 0644);
|
||
|
MODULE_PARM_DESC(pledgpio,
|
||
|
"enable changing value of GPIO2.0 bit (Power LED), default no.");
|
||
|
|
||
|
module_param_named(beepgpio, params.beepgpio, bool, 0644);
|
||
|
MODULE_PARM_DESC(beepgpio,
|
||
|
"enable changing value of GPIO2.1 bit (BEEP), default no.");
|
||
|
|
||
|
MODULE_AUTHOR("Maciej S. Szmigiero <mail@maciej.szmigiero.name>");
|
||
|
MODULE_DESCRIPTION("GPIO interface for Winbond Super I/O chips");
|
||
|
MODULE_LICENSE("GPL");
|