375 lines
8.5 KiB
C
375 lines
8.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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//
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// MP8867/MP8869 regulator driver
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//
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// Copyright (C) 2020 Synaptics Incorporated
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//
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// Author: Jisheng Zhang <jszhang@kernel.org>
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#include <linux/gpio/consumer.h>
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#include <linux/i2c.h>
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#include <linux/module.h>
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#include <linux/of_device.h>
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#include <linux/regmap.h>
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#include <linux/regulator/driver.h>
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#include <linux/regulator/of_regulator.h>
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#define MP886X_VSEL 0x00
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#define MP886X_V_BOOT (1 << 7)
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#define MP886X_SYSCNTLREG1 0x01
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#define MP886X_MODE (1 << 0)
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#define MP886X_SLEW_SHIFT 3
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#define MP886X_SLEW_MASK (0x7 << MP886X_SLEW_SHIFT)
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#define MP886X_GO (1 << 6)
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#define MP886X_EN (1 << 7)
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#define MP8869_SYSCNTLREG2 0x02
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struct mp886x_cfg_info {
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const struct regulator_ops *rops;
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const unsigned int slew_rates[8];
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const int switch_freq[4];
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const u8 fs_reg;
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const u8 fs_shift;
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};
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struct mp886x_device_info {
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struct device *dev;
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struct regulator_desc desc;
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struct regulator_init_data *regulator;
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struct gpio_desc *en_gpio;
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const struct mp886x_cfg_info *ci;
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u32 r[2];
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unsigned int sel;
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};
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static void mp886x_set_switch_freq(struct mp886x_device_info *di,
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struct regmap *regmap,
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u32 freq)
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{
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const struct mp886x_cfg_info *ci = di->ci;
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int i;
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for (i = 0; i < ARRAY_SIZE(ci->switch_freq); i++) {
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if (freq == ci->switch_freq[i]) {
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regmap_update_bits(regmap, ci->fs_reg,
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0x3 << ci->fs_shift, i << ci->fs_shift);
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return;
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}
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}
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dev_err(di->dev, "invalid frequency %d\n", freq);
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}
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static int mp886x_set_mode(struct regulator_dev *rdev, unsigned int mode)
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{
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switch (mode) {
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case REGULATOR_MODE_FAST:
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regmap_update_bits(rdev->regmap, MP886X_SYSCNTLREG1,
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MP886X_MODE, MP886X_MODE);
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break;
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case REGULATOR_MODE_NORMAL:
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regmap_update_bits(rdev->regmap, MP886X_SYSCNTLREG1,
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MP886X_MODE, 0);
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static unsigned int mp886x_get_mode(struct regulator_dev *rdev)
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{
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u32 val;
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int ret;
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ret = regmap_read(rdev->regmap, MP886X_SYSCNTLREG1, &val);
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if (ret < 0)
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return ret;
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if (val & MP886X_MODE)
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return REGULATOR_MODE_FAST;
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else
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return REGULATOR_MODE_NORMAL;
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}
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static int mp8869_set_voltage_sel(struct regulator_dev *rdev, unsigned int sel)
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{
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int ret;
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ret = regmap_update_bits(rdev->regmap, MP886X_SYSCNTLREG1,
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MP886X_GO, MP886X_GO);
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if (ret < 0)
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return ret;
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sel <<= ffs(rdev->desc->vsel_mask) - 1;
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return regmap_update_bits(rdev->regmap, rdev->desc->vsel_reg,
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MP886X_V_BOOT | rdev->desc->vsel_mask, sel);
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}
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static inline unsigned int mp8869_scale(unsigned int uv, u32 r1, u32 r2)
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{
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u32 tmp = uv * r1 / r2;
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return uv + tmp;
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}
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static int mp8869_get_voltage_sel(struct regulator_dev *rdev)
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{
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struct mp886x_device_info *di = rdev_get_drvdata(rdev);
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int ret, uv;
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unsigned int val;
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bool fbloop;
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ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg, &val);
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if (ret)
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return ret;
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fbloop = val & MP886X_V_BOOT;
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if (fbloop) {
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uv = rdev->desc->min_uV;
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uv = mp8869_scale(uv, di->r[0], di->r[1]);
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return regulator_map_voltage_linear(rdev, uv, uv);
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}
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val &= rdev->desc->vsel_mask;
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val >>= ffs(rdev->desc->vsel_mask) - 1;
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return val;
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}
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static const struct regulator_ops mp8869_regulator_ops = {
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.set_voltage_sel = mp8869_set_voltage_sel,
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.get_voltage_sel = mp8869_get_voltage_sel,
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.set_voltage_time_sel = regulator_set_voltage_time_sel,
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.map_voltage = regulator_map_voltage_linear,
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.list_voltage = regulator_list_voltage_linear,
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.enable = regulator_enable_regmap,
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.disable = regulator_disable_regmap,
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.is_enabled = regulator_is_enabled_regmap,
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.set_mode = mp886x_set_mode,
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.get_mode = mp886x_get_mode,
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.set_ramp_delay = regulator_set_ramp_delay_regmap,
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};
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static const struct mp886x_cfg_info mp8869_ci = {
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.rops = &mp8869_regulator_ops,
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.slew_rates = {
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40000,
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30000,
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20000,
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10000,
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5000,
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2500,
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1250,
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625,
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},
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.switch_freq = {
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500000,
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750000,
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1000000,
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1250000,
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},
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.fs_reg = MP8869_SYSCNTLREG2,
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.fs_shift = 4,
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};
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static int mp8867_set_voltage_sel(struct regulator_dev *rdev, unsigned int sel)
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{
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struct mp886x_device_info *di = rdev_get_drvdata(rdev);
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int ret, delta;
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ret = mp8869_set_voltage_sel(rdev, sel);
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if (ret < 0)
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return ret;
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delta = di->sel - sel;
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if (abs(delta) <= 5)
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ret = regmap_update_bits(rdev->regmap, MP886X_SYSCNTLREG1,
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MP886X_GO, 0);
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di->sel = sel;
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return ret;
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}
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static int mp8867_get_voltage_sel(struct regulator_dev *rdev)
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{
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struct mp886x_device_info *di = rdev_get_drvdata(rdev);
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int ret, uv;
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unsigned int val;
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bool fbloop;
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ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg, &val);
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if (ret)
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return ret;
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fbloop = val & MP886X_V_BOOT;
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val &= rdev->desc->vsel_mask;
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val >>= ffs(rdev->desc->vsel_mask) - 1;
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if (fbloop) {
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uv = regulator_list_voltage_linear(rdev, val);
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uv = mp8869_scale(uv, di->r[0], di->r[1]);
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return regulator_map_voltage_linear(rdev, uv, uv);
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}
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return val;
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}
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static const struct regulator_ops mp8867_regulator_ops = {
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.set_voltage_sel = mp8867_set_voltage_sel,
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.get_voltage_sel = mp8867_get_voltage_sel,
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.set_voltage_time_sel = regulator_set_voltage_time_sel,
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.map_voltage = regulator_map_voltage_linear,
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.list_voltage = regulator_list_voltage_linear,
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.enable = regulator_enable_regmap,
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.disable = regulator_disable_regmap,
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.is_enabled = regulator_is_enabled_regmap,
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.set_mode = mp886x_set_mode,
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.get_mode = mp886x_get_mode,
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.set_ramp_delay = regulator_set_ramp_delay_regmap,
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};
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static const struct mp886x_cfg_info mp8867_ci = {
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.rops = &mp8867_regulator_ops,
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.slew_rates = {
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64000,
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32000,
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16000,
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8000,
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4000,
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2000,
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1000,
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500,
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},
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.switch_freq = {
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500000,
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750000,
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1000000,
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1500000,
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},
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.fs_reg = MP886X_SYSCNTLREG1,
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.fs_shift = 1,
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};
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static int mp886x_regulator_register(struct mp886x_device_info *di,
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struct regulator_config *config)
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{
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struct regulator_desc *rdesc = &di->desc;
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struct regulator_dev *rdev;
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rdesc->name = "mp886x-reg";
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rdesc->supply_name = "vin";
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rdesc->ops = di->ci->rops;
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rdesc->type = REGULATOR_VOLTAGE;
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rdesc->n_voltages = 128;
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rdesc->enable_reg = MP886X_SYSCNTLREG1;
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rdesc->enable_mask = MP886X_EN;
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rdesc->min_uV = 600000;
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rdesc->uV_step = 10000;
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rdesc->vsel_reg = MP886X_VSEL;
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rdesc->vsel_mask = 0x3f;
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rdesc->ramp_reg = MP886X_SYSCNTLREG1;
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rdesc->ramp_mask = MP886X_SLEW_MASK;
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rdesc->ramp_delay_table = di->ci->slew_rates;
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rdesc->n_ramp_values = ARRAY_SIZE(di->ci->slew_rates);
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rdesc->owner = THIS_MODULE;
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rdev = devm_regulator_register(di->dev, &di->desc, config);
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if (IS_ERR(rdev))
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return PTR_ERR(rdev);
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di->sel = rdesc->ops->get_voltage_sel(rdev);
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return 0;
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}
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static const struct regmap_config mp886x_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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};
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static int mp886x_i2c_probe(struct i2c_client *client)
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{
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struct device *dev = &client->dev;
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struct device_node *np = dev->of_node;
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struct mp886x_device_info *di;
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struct regulator_config config = { };
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struct regmap *regmap;
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u32 freq;
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int ret;
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di = devm_kzalloc(dev, sizeof(struct mp886x_device_info), GFP_KERNEL);
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if (!di)
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return -ENOMEM;
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di->regulator = of_get_regulator_init_data(dev, np, &di->desc);
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if (!di->regulator) {
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dev_err(dev, "Platform data not found!\n");
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return -EINVAL;
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}
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ret = of_property_read_u32_array(np, "mps,fb-voltage-divider",
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di->r, 2);
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if (ret)
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return ret;
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di->en_gpio = devm_gpiod_get(dev, "enable", GPIOD_OUT_HIGH);
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if (IS_ERR(di->en_gpio))
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return PTR_ERR(di->en_gpio);
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di->ci = of_device_get_match_data(dev);
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di->dev = dev;
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regmap = devm_regmap_init_i2c(client, &mp886x_regmap_config);
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if (IS_ERR(regmap)) {
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dev_err(dev, "Failed to allocate regmap!\n");
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return PTR_ERR(regmap);
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}
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i2c_set_clientdata(client, di);
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config.dev = di->dev;
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config.init_data = di->regulator;
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config.regmap = regmap;
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config.driver_data = di;
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config.of_node = np;
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if (!of_property_read_u32(np, "mps,switch-frequency-hz", &freq))
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mp886x_set_switch_freq(di, regmap, freq);
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ret = mp886x_regulator_register(di, &config);
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if (ret < 0)
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dev_err(dev, "Failed to register regulator!\n");
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return ret;
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}
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static const struct of_device_id mp886x_dt_ids[] = {
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{
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.compatible = "mps,mp8867",
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.data = &mp8867_ci
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},
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{
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.compatible = "mps,mp8869",
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.data = &mp8869_ci
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},
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{ }
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};
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MODULE_DEVICE_TABLE(of, mp886x_dt_ids);
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static const struct i2c_device_id mp886x_id[] = {
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{ "mp886x", },
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{ },
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};
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MODULE_DEVICE_TABLE(i2c, mp886x_id);
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static struct i2c_driver mp886x_regulator_driver = {
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.driver = {
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.name = "mp886x-regulator",
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.of_match_table = mp886x_dt_ids,
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},
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.probe_new = mp886x_i2c_probe,
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.id_table = mp886x_id,
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};
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module_i2c_driver(mp886x_regulator_driver);
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MODULE_AUTHOR("Jisheng Zhang <jszhang@kernel.org>");
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MODULE_DESCRIPTION("MP886x regulator driver");
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MODULE_LICENSE("GPL v2");
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