^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Driver for voltage controller regulators
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 2017 Google, Inc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/delay.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/err.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/of.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/of_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/regulator/coupler.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/regulator/driver.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/regulator/of_regulator.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/sort.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include "internal.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) struct vctrl_voltage_range {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) int min_uV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) int max_uV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) struct vctrl_voltage_ranges {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) struct vctrl_voltage_range ctrl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) struct vctrl_voltage_range out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) struct vctrl_voltage_table {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) int ctrl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) int out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) int ovp_min_sel;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) struct vctrl_data {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) struct regulator_dev *rdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) struct regulator_desc desc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) bool enabled;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) unsigned int min_slew_down_rate;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) unsigned int ovp_threshold;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) struct vctrl_voltage_ranges vrange;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) struct vctrl_voltage_table *vtable;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) unsigned int sel;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) static int vctrl_calc_ctrl_voltage(struct vctrl_data *vctrl, int out_uV)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) struct vctrl_voltage_range *ctrl = &vctrl->vrange.ctrl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) struct vctrl_voltage_range *out = &vctrl->vrange.out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) return ctrl->min_uV +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) DIV_ROUND_CLOSEST_ULL((s64)(out_uV - out->min_uV) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) (ctrl->max_uV - ctrl->min_uV),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) out->max_uV - out->min_uV);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) static int vctrl_calc_output_voltage(struct vctrl_data *vctrl, int ctrl_uV)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) struct vctrl_voltage_range *ctrl = &vctrl->vrange.ctrl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) struct vctrl_voltage_range *out = &vctrl->vrange.out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) if (ctrl_uV < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) pr_err("vctrl: failed to get control voltage\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) return ctrl_uV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) if (ctrl_uV < ctrl->min_uV)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) return out->min_uV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) if (ctrl_uV > ctrl->max_uV)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) return out->max_uV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) return out->min_uV +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) DIV_ROUND_CLOSEST_ULL((s64)(ctrl_uV - ctrl->min_uV) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) (out->max_uV - out->min_uV),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) ctrl->max_uV - ctrl->min_uV);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) static int vctrl_get_voltage(struct regulator_dev *rdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) struct vctrl_data *vctrl = rdev_get_drvdata(rdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) int ctrl_uV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) if (!rdev->supply)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) return -EPROBE_DEFER;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) ctrl_uV = regulator_get_voltage_rdev(rdev->supply->rdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) return vctrl_calc_output_voltage(vctrl, ctrl_uV);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) static int vctrl_set_voltage(struct regulator_dev *rdev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) int req_min_uV, int req_max_uV,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) unsigned int *selector)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) struct vctrl_data *vctrl = rdev_get_drvdata(rdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) int orig_ctrl_uV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) int uV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) if (!rdev->supply)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) return -EPROBE_DEFER;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) orig_ctrl_uV = regulator_get_voltage_rdev(rdev->supply->rdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) uV = vctrl_calc_output_voltage(vctrl, orig_ctrl_uV);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) if (req_min_uV >= uV || !vctrl->ovp_threshold)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) /* voltage rising or no OVP */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) return regulator_set_voltage_rdev(rdev->supply->rdev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) vctrl_calc_ctrl_voltage(vctrl, req_min_uV),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) vctrl_calc_ctrl_voltage(vctrl, req_max_uV),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) PM_SUSPEND_ON);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) while (uV > req_min_uV) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) int max_drop_uV = (uV * vctrl->ovp_threshold) / 100;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) int next_uV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) int next_ctrl_uV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) int delay;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) /* Make sure no infinite loop even in crazy cases */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) if (max_drop_uV == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) max_drop_uV = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) next_uV = max_t(int, req_min_uV, uV - max_drop_uV);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) next_ctrl_uV = vctrl_calc_ctrl_voltage(vctrl, next_uV);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) ret = regulator_set_voltage_rdev(rdev->supply->rdev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) next_ctrl_uV,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) next_ctrl_uV,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) PM_SUSPEND_ON);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) delay = DIV_ROUND_UP(uV - next_uV, vctrl->min_slew_down_rate);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) usleep_range(delay, delay + DIV_ROUND_UP(delay, 10));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) uV = next_uV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) err:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) /* Try to go back to original voltage */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) regulator_set_voltage_rdev(rdev->supply->rdev, orig_ctrl_uV, orig_ctrl_uV,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) PM_SUSPEND_ON);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) static int vctrl_get_voltage_sel(struct regulator_dev *rdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) struct vctrl_data *vctrl = rdev_get_drvdata(rdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) return vctrl->sel;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) static int vctrl_set_voltage_sel(struct regulator_dev *rdev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) unsigned int selector)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) struct vctrl_data *vctrl = rdev_get_drvdata(rdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) unsigned int orig_sel = vctrl->sel;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) if (!rdev->supply)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) return -EPROBE_DEFER;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) if (selector >= rdev->desc->n_voltages)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) if (selector >= vctrl->sel || !vctrl->ovp_threshold) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) /* voltage rising or no OVP */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) ret = regulator_set_voltage_rdev(rdev->supply->rdev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) vctrl->vtable[selector].ctrl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) vctrl->vtable[selector].ctrl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) PM_SUSPEND_ON);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) if (!ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) vctrl->sel = selector;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) while (vctrl->sel != selector) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) unsigned int next_sel;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) int delay;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) if (selector >= vctrl->vtable[vctrl->sel].ovp_min_sel)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) next_sel = selector;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) next_sel = vctrl->vtable[vctrl->sel].ovp_min_sel;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) ret = regulator_set_voltage_rdev(rdev->supply->rdev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) vctrl->vtable[next_sel].ctrl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) vctrl->vtable[next_sel].ctrl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) PM_SUSPEND_ON);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) dev_err(&rdev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) "failed to set control voltage to %duV\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) vctrl->vtable[next_sel].ctrl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) vctrl->sel = next_sel;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) delay = DIV_ROUND_UP(vctrl->vtable[vctrl->sel].out -
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) vctrl->vtable[next_sel].out,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) vctrl->min_slew_down_rate);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) usleep_range(delay, delay + DIV_ROUND_UP(delay, 10));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) err:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) if (vctrl->sel != orig_sel) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) /* Try to go back to original voltage */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) if (!regulator_set_voltage_rdev(rdev->supply->rdev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) vctrl->vtable[orig_sel].ctrl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) vctrl->vtable[orig_sel].ctrl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) PM_SUSPEND_ON))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) vctrl->sel = orig_sel;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) dev_warn(&rdev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) "failed to restore original voltage\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) static int vctrl_list_voltage(struct regulator_dev *rdev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) unsigned int selector)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) struct vctrl_data *vctrl = rdev_get_drvdata(rdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) if (selector >= rdev->desc->n_voltages)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) return vctrl->vtable[selector].out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) static int vctrl_parse_dt(struct platform_device *pdev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) struct vctrl_data *vctrl)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) struct device_node *np = pdev->dev.of_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) u32 pval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) u32 vrange_ctrl[2];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) ret = of_property_read_u32(np, "ovp-threshold-percent", &pval);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) if (!ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) vctrl->ovp_threshold = pval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) if (vctrl->ovp_threshold > 100) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) dev_err(&pdev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) "ovp-threshold-percent (%u) > 100\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) vctrl->ovp_threshold);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) ret = of_property_read_u32(np, "min-slew-down-rate", &pval);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) if (!ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) vctrl->min_slew_down_rate = pval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) /* We use the value as int and as divider; sanity check */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) if (vctrl->min_slew_down_rate == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) dev_err(&pdev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) "min-slew-down-rate must not be 0\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) } else if (vctrl->min_slew_down_rate > INT_MAX) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) dev_err(&pdev->dev, "min-slew-down-rate (%u) too big\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) vctrl->min_slew_down_rate);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) if (vctrl->ovp_threshold && !vctrl->min_slew_down_rate) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) dev_err(&pdev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) "ovp-threshold-percent requires min-slew-down-rate\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) ret = of_property_read_u32(np, "regulator-min-microvolt", &pval);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) dev_err(&pdev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) "failed to read regulator-min-microvolt: %d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) vctrl->vrange.out.min_uV = pval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) ret = of_property_read_u32(np, "regulator-max-microvolt", &pval);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) dev_err(&pdev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) "failed to read regulator-max-microvolt: %d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) vctrl->vrange.out.max_uV = pval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) ret = of_property_read_u32_array(np, "ctrl-voltage-range", vrange_ctrl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) dev_err(&pdev->dev, "failed to read ctrl-voltage-range: %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) if (vrange_ctrl[0] >= vrange_ctrl[1]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) dev_err(&pdev->dev, "ctrl-voltage-range is invalid: %d-%d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) vrange_ctrl[0], vrange_ctrl[1]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) vctrl->vrange.ctrl.min_uV = vrange_ctrl[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) vctrl->vrange.ctrl.max_uV = vrange_ctrl[1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) static int vctrl_cmp_ctrl_uV(const void *a, const void *b)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) const struct vctrl_voltage_table *at = a;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) const struct vctrl_voltage_table *bt = b;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) return at->ctrl - bt->ctrl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) static int vctrl_init_vtable(struct platform_device *pdev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) struct regulator *ctrl_reg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) struct vctrl_data *vctrl = platform_get_drvdata(pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) struct regulator_desc *rdesc = &vctrl->desc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) struct vctrl_voltage_range *vrange_ctrl = &vctrl->vrange.ctrl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) int n_voltages;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) int ctrl_uV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) int i, idx_vt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) n_voltages = regulator_count_voltages(ctrl_reg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) rdesc->n_voltages = n_voltages;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) /* determine number of steps within the range of the vctrl regulator */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) for (i = 0; i < n_voltages; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) ctrl_uV = regulator_list_voltage(ctrl_reg, i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) if (ctrl_uV < vrange_ctrl->min_uV ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) ctrl_uV > vrange_ctrl->max_uV)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) rdesc->n_voltages--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) if (rdesc->n_voltages == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) dev_err(&pdev->dev, "invalid configuration\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) vctrl->vtable = devm_kcalloc(&pdev->dev, rdesc->n_voltages,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) sizeof(struct vctrl_voltage_table),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) if (!vctrl->vtable)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) /* create mapping control <=> output voltage */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) for (i = 0, idx_vt = 0; i < n_voltages; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) ctrl_uV = regulator_list_voltage(ctrl_reg, i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) if (ctrl_uV < vrange_ctrl->min_uV ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) ctrl_uV > vrange_ctrl->max_uV)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) vctrl->vtable[idx_vt].ctrl = ctrl_uV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) vctrl->vtable[idx_vt].out =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) vctrl_calc_output_voltage(vctrl, ctrl_uV);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) idx_vt++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) /* we rely on the table to be ordered by ascending voltage */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) sort(vctrl->vtable, rdesc->n_voltages,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) sizeof(struct vctrl_voltage_table), vctrl_cmp_ctrl_uV,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) /* pre-calculate OVP-safe downward transitions */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) for (i = rdesc->n_voltages - 1; i > 0; i--) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) int j;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) int ovp_min_uV = (vctrl->vtable[i].out *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) (100 - vctrl->ovp_threshold)) / 100;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) for (j = 0; j < i; j++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) if (vctrl->vtable[j].out >= ovp_min_uV) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) vctrl->vtable[i].ovp_min_sel = j;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) if (j == i) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) dev_warn(&pdev->dev, "switching down from %duV may cause OVP shutdown\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) vctrl->vtable[i].out);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) /* use next lowest voltage */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) vctrl->vtable[i].ovp_min_sel = i - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) static int vctrl_enable(struct regulator_dev *rdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) struct vctrl_data *vctrl = rdev_get_drvdata(rdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) vctrl->enabled = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) static int vctrl_disable(struct regulator_dev *rdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) struct vctrl_data *vctrl = rdev_get_drvdata(rdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) vctrl->enabled = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) static int vctrl_is_enabled(struct regulator_dev *rdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) struct vctrl_data *vctrl = rdev_get_drvdata(rdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) return vctrl->enabled;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) static const struct regulator_ops vctrl_ops_cont = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) .enable = vctrl_enable,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) .disable = vctrl_disable,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) .is_enabled = vctrl_is_enabled,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) .get_voltage = vctrl_get_voltage,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) .set_voltage = vctrl_set_voltage,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) static const struct regulator_ops vctrl_ops_non_cont = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) .enable = vctrl_enable,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) .disable = vctrl_disable,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) .is_enabled = vctrl_is_enabled,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) .set_voltage_sel = vctrl_set_voltage_sel,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) .get_voltage_sel = vctrl_get_voltage_sel,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) .list_voltage = vctrl_list_voltage,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) .map_voltage = regulator_map_voltage_iterate,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) static int vctrl_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) struct device_node *np = pdev->dev.of_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) struct vctrl_data *vctrl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) const struct regulator_init_data *init_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) struct regulator_desc *rdesc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) struct regulator_config cfg = { };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) struct vctrl_voltage_range *vrange_ctrl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) struct regulator *ctrl_reg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) int ctrl_uV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) vctrl = devm_kzalloc(&pdev->dev, sizeof(struct vctrl_data),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) if (!vctrl)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) platform_set_drvdata(pdev, vctrl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) ret = vctrl_parse_dt(pdev, vctrl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) ctrl_reg = devm_regulator_get(&pdev->dev, "ctrl");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) if (IS_ERR(ctrl_reg))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) return PTR_ERR(ctrl_reg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) vrange_ctrl = &vctrl->vrange.ctrl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) rdesc = &vctrl->desc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) rdesc->name = "vctrl";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) rdesc->type = REGULATOR_VOLTAGE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) rdesc->owner = THIS_MODULE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) rdesc->supply_name = "ctrl";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) if ((regulator_get_linear_step(ctrl_reg) == 1) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) (regulator_count_voltages(ctrl_reg) == -EINVAL)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) rdesc->continuous_voltage_range = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) rdesc->ops = &vctrl_ops_cont;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) rdesc->ops = &vctrl_ops_non_cont;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) init_data = of_get_regulator_init_data(&pdev->dev, np, rdesc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) if (!init_data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) cfg.of_node = np;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) cfg.dev = &pdev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) cfg.driver_data = vctrl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) cfg.init_data = init_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) if (!rdesc->continuous_voltage_range) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) ret = vctrl_init_vtable(pdev, ctrl_reg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) /* Use locked consumer API when not in regulator framework */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) ctrl_uV = regulator_get_voltage(ctrl_reg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) if (ctrl_uV < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) dev_err(&pdev->dev, "failed to get control voltage\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) return ctrl_uV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) /* determine current voltage selector from control voltage */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) if (ctrl_uV < vrange_ctrl->min_uV) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) vctrl->sel = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) } else if (ctrl_uV > vrange_ctrl->max_uV) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) vctrl->sel = rdesc->n_voltages - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) for (i = 0; i < rdesc->n_voltages; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) if (ctrl_uV == vctrl->vtable[i].ctrl) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) vctrl->sel = i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) /* Drop ctrl-supply here in favor of regulator core managed supply */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) devm_regulator_put(ctrl_reg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) vctrl->rdev = devm_regulator_register(&pdev->dev, rdesc, &cfg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) if (IS_ERR(vctrl->rdev)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) ret = PTR_ERR(vctrl->rdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) dev_err(&pdev->dev, "failed to register regulator: %d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) static const struct of_device_id vctrl_of_match[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) { .compatible = "vctrl-regulator", },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) {},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) MODULE_DEVICE_TABLE(of, vctrl_of_match);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) static struct platform_driver vctrl_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) .probe = vctrl_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) .name = "vctrl-regulator",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) .of_match_table = of_match_ptr(vctrl_of_match),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) module_platform_driver(vctrl_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) MODULE_DESCRIPTION("Voltage Controlled Regulator Driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) MODULE_AUTHOR("Matthias Kaehlcke <mka@chromium.org>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) MODULE_LICENSE("GPL v2");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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