/* $NetBSD: as3722.c,v 1.4 2015/12/13 17:15:06 jmcneill Exp $ */ /*- * Copyright (c) 2015 Jared D. McNeill * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ #include __KERNEL_RCSID(0, "$NetBSD: as3722.c,v 1.4 2015/12/13 17:15:06 jmcneill Exp $"); #include #include #include #include #include #include #include #include #include #include #include #define AS3722_GPIO0_CTRL_REG 0x08 #define AS3722_GPIO0_CTRL_INVERT __BIT(7) #define AS3722_GPIO0_CTRL_IOSF __BITS(6,3) #define AS3722_GPIO0_CTRL_IOSF_GPIO 0 #define AS3722_GPIO0_CTRL_IOSF_WATCHDOG 9 #define AS3722_GPIO0_CTRL_MODE __BITS(2,0) #define AS3722_GPIO0_CTRL_MODE_PULLDOWN 5 #define AS3722_RESET_CTRL_REG 0x36 #define AS3722_RESET_CTRL_POWER_OFF __BIT(1) #define AS3722_RESET_CTRL_FORCE_RESET __BIT(0) #define AS3722_WATCHDOG_CTRL_REG 0x38 #define AS3722_WATCHDOG_CTRL_MODE __BITS(2,1) #define AS3722_WATCHDOG_CTRL_ON __BIT(0) #define AS3722_WATCHDOG_TIMER_REG 0x46 #define AS3722_WATCHDOG_TIMER_TIMER __BITS(6,0) #define AS3722_WATCHDOG_SIGNAL_REG 0x48 #define AS3722_WATCHDOG_SIGNAL_PWM_DIV __BITS(7,6) #define AS3722_WATCHDOG_SIGNAL_SW_SIG __BIT(0) #define AS3722_ASIC_ID1_REG 0x90 #define AS3722_ASIC_ID2_REG 0x91 struct as3722_softc { device_t sc_dev; i2c_tag_t sc_i2c; i2c_addr_t sc_addr; struct sysmon_wdog sc_smw; }; #define AS3722_WATCHDOG_DEFAULT_PERIOD 10 static int as3722_match(device_t, cfdata_t, void *); static void as3722_attach(device_t, device_t, void *); static int as3722_wdt_setmode(struct sysmon_wdog *); static int as3722_wdt_tickle(struct sysmon_wdog *); static int as3722_read(struct as3722_softc *, uint8_t, uint8_t *, int); static int as3722_write(struct as3722_softc *, uint8_t, uint8_t, int); static int as3722_set_clear(struct as3722_softc *, uint8_t, uint8_t, uint8_t, int); CFATTACH_DECL_NEW(as3722pmic, sizeof(struct as3722_softc), as3722_match, as3722_attach, NULL, NULL); static const char * as3722_compats[] = { "ams,as3722", NULL }; static int as3722_match(device_t parent, cfdata_t match, void *aux) { struct i2c_attach_args *ia = aux; uint8_t reg, id1; int error; if (ia->ia_name == NULL) { iic_acquire_bus(ia->ia_tag, I2C_F_POLL); reg = AS3722_ASIC_ID1_REG; error = iic_exec(ia->ia_tag, I2C_OP_READ_WITH_STOP, ia->ia_addr, ®, 1, &id1, 1, I2C_F_POLL); iic_release_bus(ia->ia_tag, I2C_F_POLL); if (error == 0 && id1 == 0x0c) return 1; return 0; } else { return iic_compat_match(ia, as3722_compats); } } static void as3722_attach(device_t parent, device_t self, void *aux) { struct as3722_softc * const sc = device_private(self); struct i2c_attach_args *ia = aux; int error; sc->sc_dev = self; sc->sc_i2c = ia->ia_tag; sc->sc_addr = ia->ia_addr; aprint_naive("\n"); aprint_normal(": AMS AS3822\n"); iic_acquire_bus(sc->sc_i2c, I2C_F_POLL); error = as3722_write(sc, AS3722_GPIO0_CTRL_REG, __SHIFTIN(AS3722_GPIO0_CTRL_IOSF_GPIO, AS3722_GPIO0_CTRL_IOSF) | __SHIFTIN(AS3722_GPIO0_CTRL_MODE_PULLDOWN, AS3722_GPIO0_CTRL_MODE), I2C_F_POLL); error += as3722_set_clear(sc, AS3722_WATCHDOG_CTRL_REG, __SHIFTIN(1, AS3722_WATCHDOG_CTRL_MODE), 0, I2C_F_POLL); iic_release_bus(sc->sc_i2c, I2C_F_POLL); if (error) aprint_error_dev(self, "couldn't setup watchdog\n"); sc->sc_smw.smw_name = device_xname(self); sc->sc_smw.smw_cookie = sc; sc->sc_smw.smw_setmode = as3722_wdt_setmode; sc->sc_smw.smw_tickle = as3722_wdt_tickle; sc->sc_smw.smw_period = AS3722_WATCHDOG_DEFAULT_PERIOD; aprint_normal_dev(self, "default watchdog period is %u seconds\n", sc->sc_smw.smw_period); if (sysmon_wdog_register(&sc->sc_smw) != 0) aprint_error_dev(self, "couldn't register with sysmon\n"); } static int as3722_read(struct as3722_softc *sc, uint8_t reg, uint8_t *val, int flags) { return iic_exec(sc->sc_i2c, I2C_OP_READ_WITH_STOP, sc->sc_addr, ®, 1, val, 1, flags); } static int as3722_write(struct as3722_softc *sc, uint8_t reg, uint8_t val, int flags) { uint8_t buf[2] = { reg, val }; return iic_exec(sc->sc_i2c, I2C_OP_WRITE_WITH_STOP, sc->sc_addr, NULL, 0, buf, 2, flags); } static int as3722_set_clear(struct as3722_softc *sc, uint8_t reg, uint8_t set, uint8_t clr, int flags) { uint8_t old, new; int error; error = as3722_read(sc, reg, &old, flags); if (error) { return error; } new = set | (old & ~clr); return as3722_write(sc, reg, new, flags); } static int as3722_wdt_setmode(struct sysmon_wdog *smw) { struct as3722_softc * const sc = smw->smw_cookie; int error; const int flags = (cold ? I2C_F_POLL : 0); if ((smw->smw_mode & WDOG_MODE_MASK) == WDOG_MODE_DISARMED) { iic_acquire_bus(sc->sc_i2c, flags); error = as3722_set_clear(sc, AS3722_WATCHDOG_CTRL_REG, 0, AS3722_WATCHDOG_CTRL_ON, flags); iic_release_bus(sc->sc_i2c, flags); return error; } if (smw->smw_period == WDOG_PERIOD_DEFAULT) { smw->smw_period = AS3722_WATCHDOG_DEFAULT_PERIOD; } if (smw->smw_period < 1 || smw->smw_period > 128) { return EINVAL; } sc->sc_smw.smw_period = smw->smw_period; iic_acquire_bus(sc->sc_i2c, flags); error = as3722_set_clear(sc, AS3722_WATCHDOG_TIMER_REG, __SHIFTIN(sc->sc_smw.smw_period - 1, AS3722_WATCHDOG_TIMER_TIMER), AS3722_WATCHDOG_TIMER_TIMER, flags); if (error == 0) { error = as3722_set_clear(sc, AS3722_WATCHDOG_CTRL_REG, AS3722_WATCHDOG_CTRL_ON, 0, flags); } iic_release_bus(sc->sc_i2c, flags); return error; } static int as3722_wdt_tickle(struct sysmon_wdog *smw) { struct as3722_softc * const sc = smw->smw_cookie; int error; const int flags = (cold ? I2C_F_POLL : 0); iic_acquire_bus(sc->sc_i2c, flags); error = as3722_set_clear(sc, AS3722_WATCHDOG_SIGNAL_REG, AS3722_WATCHDOG_SIGNAL_SW_SIG, 0, flags); iic_release_bus(sc->sc_i2c, flags); return error; } int as3722_poweroff(device_t dev) { struct as3722_softc * const sc = device_private(dev); int error; const int flags = I2C_F_POLL; iic_acquire_bus(sc->sc_i2c, flags); error = as3722_write(sc, AS3722_RESET_CTRL_REG, AS3722_RESET_CTRL_POWER_OFF, flags); iic_release_bus(sc->sc_i2c, flags); return error; } int as3722_reboot(device_t dev) { struct as3722_softc * const sc = device_private(dev); int error; const int flags = I2C_F_POLL; iic_acquire_bus(sc->sc_i2c, flags); error = as3722_write(sc, AS3722_RESET_CTRL_REG, AS3722_RESET_CTRL_FORCE_RESET, flags); iic_release_bus(sc->sc_i2c, flags); return error; }