max77620.c revision 1.2.2.2
1 1.2.2.2 jdolecek /* $NetBSD: max77620.c,v 1.2.2.2 2017/12/03 11:37:02 jdolecek Exp $ */ 2 1.2.2.2 jdolecek 3 1.2.2.2 jdolecek /*- 4 1.2.2.2 jdolecek * Copyright (c) 2017 Jared McNeill <jmcneill (at) invisible.ca> 5 1.2.2.2 jdolecek * All rights reserved. 6 1.2.2.2 jdolecek * 7 1.2.2.2 jdolecek * Redistribution and use in source and binary forms, with or without 8 1.2.2.2 jdolecek * modification, are permitted provided that the following conditions 9 1.2.2.2 jdolecek * are met: 10 1.2.2.2 jdolecek * 1. Redistributions of source code must retain the above copyright 11 1.2.2.2 jdolecek * notice, this list of conditions and the following disclaimer. 12 1.2.2.2 jdolecek * 2. Redistributions in binary form must reproduce the above copyright 13 1.2.2.2 jdolecek * notice, this list of conditions and the following disclaimer in the 14 1.2.2.2 jdolecek * documentation and/or other materials provided with the distribution. 15 1.2.2.2 jdolecek * 16 1.2.2.2 jdolecek * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 17 1.2.2.2 jdolecek * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 18 1.2.2.2 jdolecek * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19 1.2.2.2 jdolecek * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 20 1.2.2.2 jdolecek * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 1.2.2.2 jdolecek * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 1.2.2.2 jdolecek * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 1.2.2.2 jdolecek * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 1.2.2.2 jdolecek * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 1.2.2.2 jdolecek * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 1.2.2.2 jdolecek * POSSIBILITY OF SUCH DAMAGE. 27 1.2.2.2 jdolecek */ 28 1.2.2.2 jdolecek 29 1.2.2.2 jdolecek #include <sys/cdefs.h> 30 1.2.2.2 jdolecek __KERNEL_RCSID(0, "$NetBSD: max77620.c,v 1.2.2.2 2017/12/03 11:37:02 jdolecek Exp $"); 31 1.2.2.2 jdolecek 32 1.2.2.2 jdolecek #include <sys/param.h> 33 1.2.2.2 jdolecek #include <sys/systm.h> 34 1.2.2.2 jdolecek #include <sys/kernel.h> 35 1.2.2.2 jdolecek #include <sys/device.h> 36 1.2.2.2 jdolecek #include <sys/conf.h> 37 1.2.2.2 jdolecek #include <sys/bus.h> 38 1.2.2.2 jdolecek #include <sys/kmem.h> 39 1.2.2.2 jdolecek #include <sys/gpio.h> 40 1.2.2.2 jdolecek 41 1.2.2.2 jdolecek #include <dev/i2c/i2cvar.h> 42 1.2.2.2 jdolecek 43 1.2.2.2 jdolecek #include <dev/fdt/fdtvar.h> 44 1.2.2.2 jdolecek 45 1.2.2.2 jdolecek #define MAX_GPIO_REG(n) (0x36 + (n)) 46 1.2.2.2 jdolecek #define MAX_GPIO_DEBOUNCE __BITS(7,6) 47 1.2.2.2 jdolecek #define MAX_GPIO_INT __BITS(5,4) 48 1.2.2.2 jdolecek #define MAX_GPIO_OUTPUT_VAL __BIT(3) 49 1.2.2.2 jdolecek #define MAX_GPIO_INPUT_VAL __BIT(2) 50 1.2.2.2 jdolecek #define MAX_GPIO_DIR __BIT(1) 51 1.2.2.2 jdolecek #define MAX_GPIO_DRV __BIT(0) 52 1.2.2.2 jdolecek 53 1.2.2.2 jdolecek #define MAX_GPIO_COUNT 8 54 1.2.2.2 jdolecek 55 1.2.2.2 jdolecek struct max77620_softc { 56 1.2.2.2 jdolecek device_t sc_dev; 57 1.2.2.2 jdolecek i2c_tag_t sc_i2c; 58 1.2.2.2 jdolecek i2c_addr_t sc_addr; 59 1.2.2.2 jdolecek int sc_phandle; 60 1.2.2.2 jdolecek }; 61 1.2.2.2 jdolecek 62 1.2.2.2 jdolecek struct max77620_pin { 63 1.2.2.2 jdolecek struct max77620_softc *pin_sc; 64 1.2.2.2 jdolecek int pin_num; 65 1.2.2.2 jdolecek int pin_flags; 66 1.2.2.2 jdolecek bool pin_actlo; 67 1.2.2.2 jdolecek }; 68 1.2.2.2 jdolecek 69 1.2.2.2 jdolecek static const char * max77620_compats[] = { 70 1.2.2.2 jdolecek "maxim,max77620", 71 1.2.2.2 jdolecek NULL 72 1.2.2.2 jdolecek }; 73 1.2.2.2 jdolecek 74 1.2.2.2 jdolecek static uint8_t 75 1.2.2.2 jdolecek max77620_read(struct max77620_softc *sc, uint8_t reg, int flags) 76 1.2.2.2 jdolecek { 77 1.2.2.2 jdolecek uint8_t val = 0; 78 1.2.2.2 jdolecek int error; 79 1.2.2.2 jdolecek 80 1.2.2.2 jdolecek error = iic_exec(sc->sc_i2c, I2C_OP_READ_WITH_STOP, sc->sc_addr, 81 1.2.2.2 jdolecek ®, 1, &val, 1, flags); 82 1.2.2.2 jdolecek if (error != 0) 83 1.2.2.2 jdolecek aprint_error_dev(sc->sc_dev, "error reading reg %#x: %d\n", reg, error); 84 1.2.2.2 jdolecek 85 1.2.2.2 jdolecek return val; 86 1.2.2.2 jdolecek } 87 1.2.2.2 jdolecek 88 1.2.2.2 jdolecek static void 89 1.2.2.2 jdolecek max77620_write(struct max77620_softc *sc, uint8_t reg, uint8_t val, int flags) 90 1.2.2.2 jdolecek { 91 1.2.2.2 jdolecek int error; 92 1.2.2.2 jdolecek 93 1.2.2.2 jdolecek error = iic_exec(sc->sc_i2c, I2C_OP_WRITE_WITH_STOP, sc->sc_addr, 94 1.2.2.2 jdolecek ®, 1, &val, 1, flags); 95 1.2.2.2 jdolecek if (error != 0) 96 1.2.2.2 jdolecek aprint_error_dev(sc->sc_dev, "error writing reg %#x: %d\n", reg, error); 97 1.2.2.2 jdolecek } 98 1.2.2.2 jdolecek 99 1.2.2.2 jdolecek #define I2C_READ(sc, reg) max77620_read((sc), (reg), I2C_F_POLL) 100 1.2.2.2 jdolecek #define I2C_WRITE(sc, reg, val) max77620_write((sc), (reg), (val), I2C_F_POLL) 101 1.2.2.2 jdolecek #define I2C_LOCK(sc) iic_acquire_bus((sc)->sc_i2c, I2C_F_POLL) 102 1.2.2.2 jdolecek #define I2C_UNLOCK(sc) iic_release_bus((sc)->sc_i2c, I2C_F_POLL) 103 1.2.2.2 jdolecek 104 1.2.2.2 jdolecek static int 105 1.2.2.2 jdolecek max77620_gpio_config(struct max77620_softc *sc, int pin, int flags) 106 1.2.2.2 jdolecek { 107 1.2.2.2 jdolecek uint32_t gpio; 108 1.2.2.2 jdolecek 109 1.2.2.2 jdolecek KASSERT(pin >= 0 && pin < MAX_GPIO_COUNT); 110 1.2.2.2 jdolecek 111 1.2.2.2 jdolecek gpio = I2C_READ(sc, MAX_GPIO_REG(pin)); 112 1.2.2.2 jdolecek 113 1.2.2.2 jdolecek switch (flags & (GPIO_PIN_INPUT|GPIO_PIN_OUTPUT)) { 114 1.2.2.2 jdolecek case GPIO_PIN_INPUT: 115 1.2.2.2 jdolecek gpio |= MAX_GPIO_DIR; 116 1.2.2.2 jdolecek break; 117 1.2.2.2 jdolecek case GPIO_PIN_OUTPUT: 118 1.2.2.2 jdolecek gpio &= ~MAX_GPIO_DIR; 119 1.2.2.2 jdolecek break; 120 1.2.2.2 jdolecek default: 121 1.2.2.2 jdolecek return EINVAL; 122 1.2.2.2 jdolecek } 123 1.2.2.2 jdolecek 124 1.2.2.2 jdolecek switch (flags & (GPIO_PIN_PUSHPULL|GPIO_PIN_OPENDRAIN)) { 125 1.2.2.2 jdolecek case GPIO_PIN_PUSHPULL: 126 1.2.2.2 jdolecek gpio |= MAX_GPIO_DRV; 127 1.2.2.2 jdolecek break; 128 1.2.2.2 jdolecek case GPIO_PIN_OPENDRAIN: 129 1.2.2.2 jdolecek gpio &= ~MAX_GPIO_DRV; 130 1.2.2.2 jdolecek break; 131 1.2.2.2 jdolecek default: 132 1.2.2.2 jdolecek return EINVAL; 133 1.2.2.2 jdolecek } 134 1.2.2.2 jdolecek 135 1.2.2.2 jdolecek I2C_WRITE(sc, MAX_GPIO_REG(pin), gpio); 136 1.2.2.2 jdolecek 137 1.2.2.2 jdolecek return 0; 138 1.2.2.2 jdolecek } 139 1.2.2.2 jdolecek 140 1.2.2.2 jdolecek static void * 141 1.2.2.2 jdolecek max77620_gpio_acquire(device_t dev, const void *data, size_t len, int flags) 142 1.2.2.2 jdolecek { 143 1.2.2.2 jdolecek struct max77620_softc * const sc = device_private(dev); 144 1.2.2.2 jdolecek struct max77620_pin *gpin; 145 1.2.2.2 jdolecek const u_int *gpio = data; 146 1.2.2.2 jdolecek int error; 147 1.2.2.2 jdolecek 148 1.2.2.2 jdolecek if (len != 12) 149 1.2.2.2 jdolecek return NULL; 150 1.2.2.2 jdolecek 151 1.2.2.2 jdolecek const uint8_t pin = be32toh(gpio[1]) & 0xff; 152 1.2.2.2 jdolecek const bool actlo = (be32toh(gpio[2]) & __BIT(0)) != 0; 153 1.2.2.2 jdolecek const bool pushpull = (be32toh(gpio[2]) & __BIT(1)) == 0; 154 1.2.2.2 jdolecek const bool opendrain = (be32toh(gpio[2]) & __BIT(2)) != 0; 155 1.2.2.2 jdolecek 156 1.2.2.2 jdolecek if (pushpull) 157 1.2.2.2 jdolecek flags |= GPIO_PIN_PUSHPULL; 158 1.2.2.2 jdolecek if (opendrain) 159 1.2.2.2 jdolecek flags |= GPIO_PIN_OPENDRAIN; 160 1.2.2.2 jdolecek 161 1.2.2.2 jdolecek if (pin >= MAX_GPIO_COUNT) 162 1.2.2.2 jdolecek return NULL; 163 1.2.2.2 jdolecek 164 1.2.2.2 jdolecek I2C_LOCK(sc); 165 1.2.2.2 jdolecek error = max77620_gpio_config(sc, pin, flags); 166 1.2.2.2 jdolecek I2C_UNLOCK(sc); 167 1.2.2.2 jdolecek 168 1.2.2.2 jdolecek if (error != 0) { 169 1.2.2.2 jdolecek device_printf(dev, "bad pin %d config %#x\n", pin, flags); 170 1.2.2.2 jdolecek return NULL; 171 1.2.2.2 jdolecek } 172 1.2.2.2 jdolecek 173 1.2.2.2 jdolecek gpin = kmem_zalloc(sizeof(*gpin), KM_SLEEP); 174 1.2.2.2 jdolecek gpin->pin_sc = sc; 175 1.2.2.2 jdolecek gpin->pin_num = pin; 176 1.2.2.2 jdolecek gpin->pin_flags = flags; 177 1.2.2.2 jdolecek gpin->pin_actlo = actlo; 178 1.2.2.2 jdolecek 179 1.2.2.2 jdolecek return gpin; 180 1.2.2.2 jdolecek } 181 1.2.2.2 jdolecek 182 1.2.2.2 jdolecek static void 183 1.2.2.2 jdolecek max77620_gpio_release(device_t dev, void *priv) 184 1.2.2.2 jdolecek { 185 1.2.2.2 jdolecek struct max77620_softc * const sc = device_private(dev); 186 1.2.2.2 jdolecek struct max77620_pin *gpin = priv; 187 1.2.2.2 jdolecek 188 1.2.2.2 jdolecek I2C_LOCK(sc); 189 1.2.2.2 jdolecek max77620_gpio_config(sc, gpin->pin_num, GPIO_PIN_INPUT|GPIO_PIN_OPENDRAIN); 190 1.2.2.2 jdolecek I2C_UNLOCK(sc); 191 1.2.2.2 jdolecek 192 1.2.2.2 jdolecek kmem_free(gpin, sizeof(*gpin)); 193 1.2.2.2 jdolecek } 194 1.2.2.2 jdolecek 195 1.2.2.2 jdolecek static int 196 1.2.2.2 jdolecek max77620_gpio_read(device_t dev, void *priv, bool raw) 197 1.2.2.2 jdolecek { 198 1.2.2.2 jdolecek struct max77620_softc * const sc = device_private(dev); 199 1.2.2.2 jdolecek struct max77620_pin *gpin = priv; 200 1.2.2.2 jdolecek uint8_t gpio; 201 1.2.2.2 jdolecek int val; 202 1.2.2.2 jdolecek 203 1.2.2.2 jdolecek I2C_LOCK(sc); 204 1.2.2.2 jdolecek gpio = I2C_READ(sc, MAX_GPIO_REG(gpin->pin_num)); 205 1.2.2.2 jdolecek I2C_UNLOCK(sc); 206 1.2.2.2 jdolecek 207 1.2.2.2 jdolecek val = __SHIFTOUT(gpio, MAX_GPIO_INPUT_VAL); 208 1.2.2.2 jdolecek if (!raw && gpin->pin_actlo) 209 1.2.2.2 jdolecek val = !val; 210 1.2.2.2 jdolecek 211 1.2.2.2 jdolecek #ifdef MAX77620_DEBUG 212 1.2.2.2 jdolecek device_printf(sc->sc_dev, "GPIO%d rd %02x (%d %d)\n", 213 1.2.2.2 jdolecek gpin->pin_num, gpio, 214 1.2.2.2 jdolecek (int)__SHIFTOUT(gpio, MAX_GPIO_INPUT_VAL), val); 215 1.2.2.2 jdolecek #endif 216 1.2.2.2 jdolecek 217 1.2.2.2 jdolecek return val; 218 1.2.2.2 jdolecek } 219 1.2.2.2 jdolecek 220 1.2.2.2 jdolecek static void 221 1.2.2.2 jdolecek max77620_gpio_write(device_t dev, void *priv, int val, bool raw) 222 1.2.2.2 jdolecek { 223 1.2.2.2 jdolecek struct max77620_softc * const sc = device_private(dev); 224 1.2.2.2 jdolecek struct max77620_pin *gpin = priv; 225 1.2.2.2 jdolecek uint8_t gpio; 226 1.2.2.2 jdolecek 227 1.2.2.2 jdolecek if (!raw && gpin->pin_actlo) 228 1.2.2.2 jdolecek val = !val; 229 1.2.2.2 jdolecek 230 1.2.2.2 jdolecek I2C_LOCK(sc); 231 1.2.2.2 jdolecek gpio = I2C_READ(sc, MAX_GPIO_REG(gpin->pin_num)); 232 1.2.2.2 jdolecek gpio &= ~MAX_GPIO_OUTPUT_VAL; 233 1.2.2.2 jdolecek gpio |= __SHIFTIN(val, MAX_GPIO_OUTPUT_VAL); 234 1.2.2.2 jdolecek #ifdef MAX77620_DEBUG 235 1.2.2.2 jdolecek device_printf(sc->sc_dev, "GPIO%d wr %02x -> %02x\n", 236 1.2.2.2 jdolecek gpin->pin_num, 237 1.2.2.2 jdolecek I2C_READ(sc, MAX_GPIO_REG(gpin->pin_num)), gpio); 238 1.2.2.2 jdolecek #endif 239 1.2.2.2 jdolecek I2C_WRITE(sc, MAX_GPIO_REG(gpin->pin_num), gpio); 240 1.2.2.2 jdolecek I2C_UNLOCK(sc); 241 1.2.2.2 jdolecek } 242 1.2.2.2 jdolecek 243 1.2.2.2 jdolecek static struct fdtbus_gpio_controller_func max77620_gpio_funcs = { 244 1.2.2.2 jdolecek .acquire = max77620_gpio_acquire, 245 1.2.2.2 jdolecek .release = max77620_gpio_release, 246 1.2.2.2 jdolecek .read = max77620_gpio_read, 247 1.2.2.2 jdolecek .write = max77620_gpio_write, 248 1.2.2.2 jdolecek }; 249 1.2.2.2 jdolecek 250 1.2.2.2 jdolecek static void 251 1.2.2.2 jdolecek max77620_gpio_attach(struct max77620_softc *sc) 252 1.2.2.2 jdolecek { 253 1.2.2.2 jdolecek fdtbus_register_gpio_controller(sc->sc_dev, sc->sc_phandle, 254 1.2.2.2 jdolecek &max77620_gpio_funcs); 255 1.2.2.2 jdolecek } 256 1.2.2.2 jdolecek 257 1.2.2.2 jdolecek static int 258 1.2.2.2 jdolecek max77620_match(device_t parent, cfdata_t match, void *aux) 259 1.2.2.2 jdolecek { 260 1.2.2.2 jdolecek struct i2c_attach_args *ia = aux; 261 1.2.2.2 jdolecek 262 1.2.2.2 jdolecek if (ia->ia_name == NULL) 263 1.2.2.2 jdolecek return 0; 264 1.2.2.2 jdolecek 265 1.2.2.2 jdolecek return iic_compat_match(ia, max77620_compats); 266 1.2.2.2 jdolecek } 267 1.2.2.2 jdolecek 268 1.2.2.2 jdolecek static void 269 1.2.2.2 jdolecek max77620_attach(device_t parent, device_t self, void *aux) 270 1.2.2.2 jdolecek { 271 1.2.2.2 jdolecek struct max77620_softc * const sc = device_private(self); 272 1.2.2.2 jdolecek struct i2c_attach_args *ia = aux; 273 1.2.2.2 jdolecek 274 1.2.2.2 jdolecek sc->sc_dev = self; 275 1.2.2.2 jdolecek sc->sc_i2c = ia->ia_tag; 276 1.2.2.2 jdolecek sc->sc_addr = ia->ia_addr; 277 1.2.2.2 jdolecek sc->sc_phandle = ia->ia_cookie; 278 1.2.2.2 jdolecek 279 1.2.2.2 jdolecek aprint_naive("\n"); 280 1.2.2.2 jdolecek aprint_normal(": MAX77620 Power Management IC\n"); 281 1.2.2.2 jdolecek 282 1.2.2.2 jdolecek max77620_gpio_attach(sc); 283 1.2.2.2 jdolecek } 284 1.2.2.2 jdolecek 285 1.2.2.2 jdolecek CFATTACH_DECL_NEW(max77620pmic, sizeof(struct max77620_softc), 286 1.2.2.2 jdolecek max77620_match, max77620_attach, NULL, NULL); 287
Indexes created Fri Oct 03 02:09:57 GMT 2025