/* $NetBSD: act8846.c,v 1.6 2019/07/27 16:02:27 thorpej Exp $ */

/*-
* Copyright (c) 2015 Jared D. McNeill <[email protected]>
* 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.
*/

//#define ACT_DEBUG

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: act8846.c,v 1.6 2019/07/27 16:02:27 thorpej Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/device.h>
#include <sys/conf.h>
#include <sys/bus.h>
#include <sys/kmem.h>

#include <dev/i2c/i2cvar.h>
#include <dev/i2c/act8846.h>

#define ACT_BATTVOL_STATUS_REG          0x00
#define ACT_THERMAL_CTRL_REG            0x01
#define ACT_DCDC1_BASE_REG              0x10
#define ACT_DCDC2_BASE_REG              0x20
#define ACT_DCDC3_BASE_REG              0x30
#define ACT_DCDC4_BASE_REG              0x40
#define ACT_LDO1_BASE_REG               0x50
#define ACT_LDO2_BASE_REG               0x58
#define ACT_LDO3_BASE_REG               0x60
#define ACT_LDO4_BASE_REG               0x68
#define ACT_LDO5_BASE_REG               0x70
#define ACT_LDO6_BASE_REG               0x80
#define ACT_LDO7_BASE_REG               0x90
#define ACT_LDO8_BASE_REG               0xa0
#define ACT_LDO9_BASE_REG               0xb0

#define ACT_VSET0_OFFSET                0
#define ACT_VSET1_OFFSET                1
#define ACT_DCDC_CTRL_OFFSET            2
#define ACT_LDO_CTRL_OFFSET             1

#define ACT_VSET_VSET                   __BITS(5,0)

#define ACT_DCDC_CTRL_ON                __BIT(7)

#define ACT_LDO_CTRL_ON                 __BIT(7)

enum act8846_ctrl_type {
       ACT_CTRL_DCDC,
       ACT_CTRL_LDO,
};

#define ACT_VOLTAGE_MIN                 600
#define ACT_VOLTAGE_MAX                 3900

struct act8846_ctrl {
       device_t        c_dev;

       const char *    c_name;
       u_int           c_min;
       u_int           c_max;
       uint8_t         c_base;
       enum act8846_ctrl_type c_type;
};

#define ACT_CTRL(name, base, type)                              \
       { .c_name = (name),                                     \
         .c_min = ACT_VOLTAGE_MIN, .c_max = ACT_VOLTAGE_MAX,   \
         .c_base = ACT_ ## base ## _BASE_REG, .c_type = (type) }

#define ACT_DCDC(name, base)    ACT_CTRL(name, base, ACT_CTRL_DCDC)
#define ACT_LDO(name, base)     ACT_CTRL(name, base, ACT_CTRL_LDO)

static const struct act8846_ctrl act8846_ctrls[] = {
       ACT_DCDC("DCDC1", DCDC1),       /* VCC_DDR */
       ACT_DCDC("DCDC2", DCDC2),       /* VDD_LOG */
       ACT_DCDC("DCDC3", DCDC3),       /* VDD_ARM */
       ACT_DCDC("DCDC4", DCDC4),       /* VCC_IO */
       ACT_LDO("LDO1", LDO1),          /* VDD_10 */
       ACT_LDO("LDO2", LDO2),          /* VCC_25 */
       ACT_LDO("LDO3", LDO3),          /* VCC18_CIF */
       ACT_LDO("LDO4", LDO4),          /* VCCA_33 */
       ACT_LDO("LDO5", LDO5),          /* VCC_TOUCH */
       ACT_LDO("LDO6", LDO6),          /* VCC33 */
       ACT_LDO("LDO7", LDO7),          /* VCC18_IO */
       ACT_LDO("LDO8", LDO8),          /* VCC28_CIF */
#if 0
       ACT_LDO("LDO9", LDO9),          /* VDD_RTC (Always-ON) */
#endif
};

/* From datasheet, Table 5: REGx/VSET[] Output Voltage Setting */
static const u_int act8846_vset[] = {
       600, 625, 650, 675, 700, 725, 750, 775,
       800, 825, 850, 875, 900, 925, 950, 975,
       1000, 1025, 1050, 1075, 1100, 1125, 1150, 1175,
       1200, 1250, 1300, 1350, 1400, 1450, 1500, 1550,
       1600, 1650, 1700, 1750, 1800, 1850, 1900, 1950,
       2000, 2050, 2100, 2150, 2200, 2250, 2300, 2350,
       2400, 2500, 2600, 2700, 2800, 2900, 3000, 3100,
       3200, 3300, 3400, 3500, 3600, 3700, 3800, 3900
};

struct act8846_softc {
       device_t        sc_dev;
       i2c_tag_t       sc_i2c;
       i2c_addr_t      sc_addr;

       u_int           sc_nctrl;
       struct act8846_ctrl *sc_ctrl;
};

static int      act8846_match(device_t, cfdata_t, void *);
static void     act8846_attach(device_t, device_t, void *);

static int      act8846_read(struct act8846_softc *, uint8_t, uint8_t *);
static int      act8846_write(struct act8846_softc *, uint8_t, uint8_t);

static void     act8846_print(struct act8846_ctrl *c);

CFATTACH_DECL_NEW(act8846pm, sizeof(struct act8846_softc),
   act8846_match, act8846_attach, NULL, NULL);

static int
act8846_match(device_t parent, cfdata_t match, void *aux)
{
       struct i2c_attach_args *ia = aux;

       if (ia->ia_addr == 0x5a)
               return I2C_MATCH_ADDRESS_ONLY;

       return 0;
}

static void
act8846_attach(device_t parent, device_t self, void *aux)
{
       struct act8846_softc *sc = device_private(self);
       struct i2c_attach_args *ia = aux;
       u_int n;

       sc->sc_dev = self;
       sc->sc_i2c = ia->ia_tag;
       sc->sc_addr = ia->ia_addr;

       aprint_naive("\n");
       aprint_normal("\n");

       sc->sc_nctrl = __arraycount(act8846_ctrls);
       sc->sc_ctrl = kmem_alloc(sizeof(act8846_ctrls), KM_SLEEP);
       memcpy(sc->sc_ctrl, act8846_ctrls, sizeof(act8846_ctrls));
       for (n = 0; n < sc->sc_nctrl; n++) {
               sc->sc_ctrl[n].c_dev = self;
       }

       for (n = 0; n < sc->sc_nctrl; n++) {
               act8846_print(&sc->sc_ctrl[n]);
       }
}

static int
act8846_read(struct act8846_softc *sc, uint8_t reg, uint8_t *val)
{
       return iic_smbus_read_byte(sc->sc_i2c, sc->sc_addr, reg, val, 0);
}

static int
act8846_write(struct act8846_softc *sc, uint8_t reg, uint8_t val)
{
       return iic_smbus_write_byte(sc->sc_i2c, sc->sc_addr, reg, val, 0);
}

static void
act8846_print(struct act8846_ctrl *c)
{
       struct act8846_softc *sc = device_private(c->c_dev);
       u_int voltage;
       bool enabled;

       device_printf(sc->sc_dev, "%s:", c->c_name);
       if (act8846_get_voltage(c, &voltage)) {
               printf(" [??? V]");
       } else {
               printf(" [%d.%03dV]", voltage / 1000,
                   voltage % 1000);
       }
       if (act8846_is_enabled(c, &enabled)) {
               printf(" [unknown state]");
       } else {
               printf(" [%s]", enabled ? "ON" : "OFF");
       }
       printf("\n");
}

struct act8846_ctrl *
act8846_lookup(device_t dev, const char *name)
{
       struct act8846_softc *sc = device_private(dev);
       struct act8846_ctrl *c;
       u_int n;

       for (n = 0; n < sc->sc_nctrl; n++) {
               c = &sc->sc_ctrl[n];
               if (strcmp(c->c_name, name) == 0) {
                       return c;
               }
       }

       return NULL;
}

int
act8846_set_voltage(struct act8846_ctrl *c, u_int min, u_int max)
{
       struct act8846_softc *sc = device_private(c->c_dev);
       uint8_t val;
       int error, n;

       if (min < c->c_min || min > c->c_max || (min % 25) != 0)
               return EINVAL;

       for (n = 0; n < __arraycount(act8846_vset); n++) {
               if (min >= act8846_vset[n] && max <= act8846_vset[n]) {
                       break;
               }
       }
       if (n == __arraycount(act8846_vset))
               return EINVAL;

       val = __SHIFTIN(n, ACT_VSET_VSET);

       iic_acquire_bus(sc->sc_i2c, 0);
       error = act8846_write(sc, c->c_base + ACT_VSET0_OFFSET, val);
       iic_release_bus(sc->sc_i2c, 0);
#ifdef ACT_DEBUG
       if (error == 0)
               act8846_print(c);
#endif
       return error;
}

int
act8846_get_voltage(struct act8846_ctrl *c, u_int *pvol)
{
       struct act8846_softc *sc = device_private(c->c_dev);
       uint8_t val;
       int error;

       iic_acquire_bus(sc->sc_i2c, 0);
       error = act8846_read(sc, c->c_base + ACT_VSET0_OFFSET, &val);
       iic_release_bus(sc->sc_i2c, 0);
       if (error)
               return error;

       *pvol = act8846_vset[__SHIFTOUT(val, ACT_VSET_VSET)];

       return 0;
}

int
act8846_is_enabled(struct act8846_ctrl *c, bool *penabled)
{
       struct act8846_softc *sc = device_private(c->c_dev);
       uint8_t val, regoff, regmask;
       int error;

       if (c->c_type == ACT_CTRL_DCDC) {
               regoff = ACT_DCDC_CTRL_OFFSET;
               regmask = ACT_DCDC_CTRL_ON;
       } else {
               regoff = ACT_LDO_CTRL_OFFSET;
               regmask = ACT_LDO_CTRL_ON;
       }

       iic_acquire_bus(sc->sc_i2c, 0);
       error = act8846_read(sc, c->c_base + regoff, &val);
       iic_release_bus(sc->sc_i2c, 0);
       if (error)
               return error;

       *penabled = !!(val & regmask);
       return 0;
}

int
act8846_enable(struct act8846_ctrl *c)
{
       struct act8846_softc *sc = device_private(c->c_dev);
       uint8_t val, regoff, regmask;
       int error;

       if (c->c_type == ACT_CTRL_DCDC) {
               regoff = ACT_DCDC_CTRL_OFFSET;
               regmask = ACT_DCDC_CTRL_ON;
       } else {
               regoff = ACT_LDO_CTRL_OFFSET;
               regmask = ACT_LDO_CTRL_ON;
       }

       iic_acquire_bus(sc->sc_i2c, 0);
       if ((error = act8846_read(sc, c->c_base + regoff, &val)) != 0)
               goto done;
       val |= regmask;
       error = act8846_write(sc, c->c_base + regoff, val);
done:
       iic_release_bus(sc->sc_i2c, 0);
#ifdef ACT_DEBUG
       if (error == 0)
               act8846_print(c);
#endif

       return error;
}

int
act8846_disable(struct act8846_ctrl *c)
{
       struct act8846_softc *sc = device_private(c->c_dev);
       uint8_t val, regoff, regmask;
       int error;

       if (c->c_type == ACT_CTRL_DCDC) {
               regoff = ACT_DCDC_CTRL_OFFSET;
               regmask = ACT_DCDC_CTRL_ON;
       } else {
               regoff = ACT_LDO_CTRL_OFFSET;
               regmask = ACT_LDO_CTRL_ON;
       }

       iic_acquire_bus(sc->sc_i2c, 0);
       if ((error = act8846_read(sc, c->c_base + regoff, &val)) != 0)
               goto done;
       val &= ~regmask;
       error = act8846_write(sc, c->c_base + regoff, val);
done:
       iic_release_bus(sc->sc_i2c, 0);
#ifdef ACT_DEBUG
       if (error == 0)
               act8846_print(c);
#endif

       return error;
}

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