368 lines
8.5 KiB
C
368 lines
8.5 KiB
C
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/*
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* Driver for TPS65218 Integrated power management chipsets
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*
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* Copyright (C) 2014 Texas Instruments Incorporated - http://www.ti.com/
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed "as is" WITHOUT ANY WARRANTY of any
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* kind, whether expressed or implied; without even the implied warranty
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License version 2 for more details.
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*/
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#include <linux/kernel.h>
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#include <linux/device.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/init.h>
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#include <linux/i2c.h>
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#include <linux/slab.h>
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#include <linux/regmap.h>
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#include <linux/err.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/irq.h>
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#include <linux/interrupt.h>
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#include <linux/mutex.h>
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#include <linux/mfd/core.h>
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#include <linux/mfd/tps65218.h>
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#define TPS65218_PASSWORD_REGS_UNLOCK 0x7D
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static const struct mfd_cell tps65218_cells[] = {
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{
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.name = "tps65218-pwrbutton",
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.of_compatible = "ti,tps65218-pwrbutton",
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},
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{
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.name = "tps65218-gpio",
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.of_compatible = "ti,tps65218-gpio",
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},
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{ .name = "tps65218-regulator", },
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};
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/**
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* tps65218_reg_write: Write a single tps65218 register.
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*
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* @tps65218: Device to write to.
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* @reg: Register to write to.
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* @val: Value to write.
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* @level: Password protected level
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*/
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int tps65218_reg_write(struct tps65218 *tps, unsigned int reg,
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unsigned int val, unsigned int level)
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{
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int ret;
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unsigned int xor_reg_val;
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switch (level) {
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case TPS65218_PROTECT_NONE:
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return regmap_write(tps->regmap, reg, val);
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case TPS65218_PROTECT_L1:
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xor_reg_val = reg ^ TPS65218_PASSWORD_REGS_UNLOCK;
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ret = regmap_write(tps->regmap, TPS65218_REG_PASSWORD,
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xor_reg_val);
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if (ret < 0)
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return ret;
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return regmap_write(tps->regmap, reg, val);
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default:
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return -EINVAL;
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}
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}
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EXPORT_SYMBOL_GPL(tps65218_reg_write);
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/**
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* tps65218_update_bits: Modify bits w.r.t mask, val and level.
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*
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* @tps65218: Device to write to.
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* @reg: Register to read-write to.
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* @mask: Mask.
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* @val: Value to write.
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* @level: Password protected level
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*/
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static int tps65218_update_bits(struct tps65218 *tps, unsigned int reg,
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unsigned int mask, unsigned int val, unsigned int level)
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{
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int ret;
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unsigned int data;
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ret = regmap_read(tps->regmap, reg, &data);
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if (ret) {
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dev_err(tps->dev, "Read from reg 0x%x failed\n", reg);
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return ret;
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}
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data &= ~mask;
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data |= val & mask;
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mutex_lock(&tps->tps_lock);
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ret = tps65218_reg_write(tps, reg, data, level);
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if (ret)
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dev_err(tps->dev, "Write for reg 0x%x failed\n", reg);
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mutex_unlock(&tps->tps_lock);
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return ret;
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}
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int tps65218_set_bits(struct tps65218 *tps, unsigned int reg,
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unsigned int mask, unsigned int val, unsigned int level)
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{
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return tps65218_update_bits(tps, reg, mask, val, level);
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}
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EXPORT_SYMBOL_GPL(tps65218_set_bits);
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int tps65218_clear_bits(struct tps65218 *tps, unsigned int reg,
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unsigned int mask, unsigned int level)
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{
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return tps65218_update_bits(tps, reg, mask, 0, level);
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}
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EXPORT_SYMBOL_GPL(tps65218_clear_bits);
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static const struct regmap_range tps65218_yes_ranges[] = {
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regmap_reg_range(TPS65218_REG_INT1, TPS65218_REG_INT2),
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regmap_reg_range(TPS65218_REG_STATUS, TPS65218_REG_STATUS),
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};
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static const struct regmap_access_table tps65218_volatile_table = {
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.yes_ranges = tps65218_yes_ranges,
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.n_yes_ranges = ARRAY_SIZE(tps65218_yes_ranges),
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};
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static const struct regmap_config tps65218_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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.cache_type = REGCACHE_RBTREE,
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.volatile_table = &tps65218_volatile_table,
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};
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static const struct regmap_irq tps65218_irqs[] = {
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/* INT1 IRQs */
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[TPS65218_PRGC_IRQ] = {
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.mask = TPS65218_INT1_PRGC,
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},
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[TPS65218_CC_AQC_IRQ] = {
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.mask = TPS65218_INT1_CC_AQC,
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},
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[TPS65218_HOT_IRQ] = {
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.mask = TPS65218_INT1_HOT,
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},
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[TPS65218_PB_IRQ] = {
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.mask = TPS65218_INT1_PB,
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},
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[TPS65218_AC_IRQ] = {
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.mask = TPS65218_INT1_AC,
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},
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[TPS65218_VPRG_IRQ] = {
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.mask = TPS65218_INT1_VPRG,
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},
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[TPS65218_INVALID1_IRQ] = {
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},
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[TPS65218_INVALID2_IRQ] = {
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},
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/* INT2 IRQs*/
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[TPS65218_LS1_I_IRQ] = {
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.mask = TPS65218_INT2_LS1_I,
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.reg_offset = 1,
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},
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[TPS65218_LS2_I_IRQ] = {
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.mask = TPS65218_INT2_LS2_I,
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.reg_offset = 1,
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},
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[TPS65218_LS3_I_IRQ] = {
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.mask = TPS65218_INT2_LS3_I,
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.reg_offset = 1,
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},
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[TPS65218_LS1_F_IRQ] = {
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.mask = TPS65218_INT2_LS1_F,
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.reg_offset = 1,
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},
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[TPS65218_LS2_F_IRQ] = {
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.mask = TPS65218_INT2_LS2_F,
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.reg_offset = 1,
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},
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[TPS65218_LS3_F_IRQ] = {
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.mask = TPS65218_INT2_LS3_F,
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.reg_offset = 1,
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},
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[TPS65218_INVALID3_IRQ] = {
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},
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[TPS65218_INVALID4_IRQ] = {
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},
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};
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static struct regmap_irq_chip tps65218_irq_chip = {
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.name = "tps65218",
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.irqs = tps65218_irqs,
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.num_irqs = ARRAY_SIZE(tps65218_irqs),
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.num_regs = 2,
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.mask_base = TPS65218_REG_INT_MASK1,
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.status_base = TPS65218_REG_INT1,
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};
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static const struct of_device_id of_tps65218_match_table[] = {
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{ .compatible = "ti,tps65218", },
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{}
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};
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MODULE_DEVICE_TABLE(of, of_tps65218_match_table);
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static int tps65218_voltage_set_strict(struct tps65218 *tps)
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{
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u32 strict;
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if (of_property_read_u32(tps->dev->of_node,
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"ti,strict-supply-voltage-supervision",
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&strict))
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return 0;
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if (strict != 0 && strict != 1) {
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dev_err(tps->dev,
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"Invalid ti,strict-supply-voltage-supervision value\n");
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return -EINVAL;
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}
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tps65218_update_bits(tps, TPS65218_REG_CONFIG1,
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TPS65218_CONFIG1_STRICT,
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strict ? TPS65218_CONFIG1_STRICT : 0,
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TPS65218_PROTECT_L1);
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return 0;
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}
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static int tps65218_voltage_set_uv_hyst(struct tps65218 *tps)
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{
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u32 hyst;
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if (of_property_read_u32(tps->dev->of_node,
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"ti,under-voltage-hyst-microvolt", &hyst))
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return 0;
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if (hyst != 400000 && hyst != 200000) {
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dev_err(tps->dev,
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"Invalid ti,under-voltage-hyst-microvolt value\n");
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return -EINVAL;
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}
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tps65218_update_bits(tps, TPS65218_REG_CONFIG2,
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TPS65218_CONFIG2_UVLOHYS,
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hyst == 400000 ? TPS65218_CONFIG2_UVLOHYS : 0,
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TPS65218_PROTECT_L1);
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return 0;
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}
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static int tps65218_voltage_set_uvlo(struct tps65218 *tps)
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{
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u32 uvlo;
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int uvloval;
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if (of_property_read_u32(tps->dev->of_node,
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"ti,under-voltage-limit-microvolt", &uvlo))
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return 0;
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switch (uvlo) {
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case 2750000:
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uvloval = TPS65218_CONFIG1_UVLO_2750000;
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break;
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case 2950000:
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uvloval = TPS65218_CONFIG1_UVLO_2950000;
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break;
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case 3250000:
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uvloval = TPS65218_CONFIG1_UVLO_3250000;
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break;
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case 3350000:
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uvloval = TPS65218_CONFIG1_UVLO_3350000;
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break;
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default:
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dev_err(tps->dev,
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"Invalid ti,under-voltage-limit-microvolt value\n");
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return -EINVAL;
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}
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tps65218_update_bits(tps, TPS65218_REG_CONFIG1,
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TPS65218_CONFIG1_UVLO_MASK, uvloval,
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TPS65218_PROTECT_L1);
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return 0;
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}
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static int tps65218_probe(struct i2c_client *client,
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const struct i2c_device_id *ids)
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{
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struct tps65218 *tps;
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int ret;
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unsigned int chipid;
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tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL);
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if (!tps)
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return -ENOMEM;
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i2c_set_clientdata(client, tps);
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tps->dev = &client->dev;
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tps->irq = client->irq;
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tps->regmap = devm_regmap_init_i2c(client, &tps65218_regmap_config);
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if (IS_ERR(tps->regmap)) {
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ret = PTR_ERR(tps->regmap);
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dev_err(tps->dev, "Failed to allocate register map: %d\n",
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ret);
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return ret;
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}
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mutex_init(&tps->tps_lock);
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ret = devm_regmap_add_irq_chip(&client->dev, tps->regmap, tps->irq,
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IRQF_ONESHOT, 0, &tps65218_irq_chip,
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&tps->irq_data);
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if (ret < 0)
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return ret;
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ret = regmap_read(tps->regmap, TPS65218_REG_CHIPID, &chipid);
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if (ret) {
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dev_err(tps->dev, "Failed to read chipid: %d\n", ret);
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return ret;
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}
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tps->rev = chipid & TPS65218_CHIPID_REV_MASK;
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ret = tps65218_voltage_set_strict(tps);
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if (ret)
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return ret;
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ret = tps65218_voltage_set_uvlo(tps);
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if (ret)
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return ret;
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ret = tps65218_voltage_set_uv_hyst(tps);
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if (ret)
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return ret;
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ret = mfd_add_devices(tps->dev, PLATFORM_DEVID_AUTO, tps65218_cells,
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ARRAY_SIZE(tps65218_cells), NULL, 0,
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regmap_irq_get_domain(tps->irq_data));
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return ret;
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}
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static const struct i2c_device_id tps65218_id_table[] = {
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{ "tps65218", TPS65218 },
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{ },
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};
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MODULE_DEVICE_TABLE(i2c, tps65218_id_table);
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static struct i2c_driver tps65218_driver = {
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.driver = {
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.name = "tps65218",
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.of_match_table = of_tps65218_match_table,
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},
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.probe = tps65218_probe,
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.id_table = tps65218_id_table,
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};
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module_i2c_driver(tps65218_driver);
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MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>");
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MODULE_DESCRIPTION("TPS65218 chip family multi-function driver");
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MODULE_LICENSE("GPL v2");
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