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624 lines
16 KiB
624 lines
16 KiB
// SPDX-License-Identifier: GPL-2.0 |
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// |
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// MCP16502 PMIC driver |
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// |
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// Copyright (C) 2018 Microchip Technology Inc. and its subsidiaries |
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// |
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// Author: Andrei Stefanescu <[email protected]> |
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// |
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// Inspired from tps65086-regulator.c |
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#include <linux/gpio.h> |
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#include <linux/i2c.h> |
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#include <linux/init.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/of.h> |
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#include <linux/regmap.h> |
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#include <linux/regulator/driver.h> |
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#include <linux/suspend.h> |
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#include <linux/gpio/consumer.h> |
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#define VDD_LOW_SEL 0x0D |
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#define VDD_HIGH_SEL 0x3F |
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#define MCP16502_FLT BIT(7) |
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#define MCP16502_DVSR GENMASK(3, 2) |
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#define MCP16502_ENS BIT(0) |
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/* |
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* The PMIC has four sets of registers corresponding to four power modes: |
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* Performance, Active, Low-power, Hibernate. |
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* |
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* Registers: |
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* Each regulator has a register for each power mode. To access a register |
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* for a specific regulator and mode BASE_* and OFFSET_* need to be added. |
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* |
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* Operating modes: |
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* In order for the PMIC to transition to operating modes it has to be |
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* controlled via GPIO lines called LPM and HPM. |
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* |
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* The registers are fully configurable such that you can put all regulators in |
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* a low-power state while the PMIC is in Active mode. They are supposed to be |
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* configured at startup and then simply transition to/from a global low-power |
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* state by setting the GPIO lpm pin high/low. |
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* |
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* This driver keeps the PMIC in Active mode, Low-power state is set for the |
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* regulators by enabling/disabling operating mode (FPWM or Auto PFM). |
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* |
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* The PMIC's Low-power and Hibernate modes are used during standby/suspend. |
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* To enter standby/suspend the PMIC will go to Low-power mode. From there, it |
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* will transition to Hibernate when the PWRHLD line is set to low by the MPU. |
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*/ |
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/* |
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* This function is useful for iterating over all regulators and accessing their |
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* registers in a generic way or accessing a regulator device by its id. |
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*/ |
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#define MCP16502_REG_BASE(i, r) ((((i) + 1) << 4) + MCP16502_REG_##r) |
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#define MCP16502_STAT_BASE(i) ((i) + 5) |
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#define MCP16502_OPMODE_ACTIVE REGULATOR_MODE_NORMAL |
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#define MCP16502_OPMODE_LPM REGULATOR_MODE_IDLE |
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#define MCP16502_OPMODE_HIB REGULATOR_MODE_STANDBY |
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#define MCP16502_MODE_AUTO_PFM 0 |
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#define MCP16502_MODE_FPWM BIT(6) |
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#define MCP16502_VSEL 0x3F |
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#define MCP16502_EN BIT(7) |
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#define MCP16502_MODE BIT(6) |
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#define MCP16502_MIN_REG 0x0 |
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#define MCP16502_MAX_REG 0x65 |
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/** |
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* enum mcp16502_reg - MCP16502 regulators's registers |
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* @MCP16502_REG_A: active state register |
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* @MCP16502_REG_LPM: low power mode state register |
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* @MCP16502_REG_HIB: hibernate state register |
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* @MCP16502_REG_SEQ: startup sequence register |
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* @MCP16502_REG_CFG: configuration register |
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*/ |
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enum mcp16502_reg { |
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MCP16502_REG_A, |
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MCP16502_REG_LPM, |
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MCP16502_REG_HIB, |
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MCP16502_REG_HPM, |
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MCP16502_REG_SEQ, |
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MCP16502_REG_CFG, |
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}; |
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/* Ramp delay (uV/us) for buck1, ldo1, ldo2. */ |
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static const int mcp16502_ramp_b1l12[] = { 6250, 3125, 2083, 1563 }; |
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/* Ramp delay (uV/us) for buck2, buck3, buck4. */ |
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static const int mcp16502_ramp_b234[] = { 3125, 1563, 1042, 781 }; |
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static unsigned int mcp16502_of_map_mode(unsigned int mode) |
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{ |
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if (mode == REGULATOR_MODE_NORMAL || mode == REGULATOR_MODE_IDLE) |
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return mode; |
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return REGULATOR_MODE_INVALID; |
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} |
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#define MCP16502_REGULATOR(_name, _id, _ranges, _ops) \ |
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[_id] = { \ |
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.name = _name, \ |
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.regulators_node = of_match_ptr("regulators"), \ |
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.id = _id, \ |
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.ops = &(_ops), \ |
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.type = REGULATOR_VOLTAGE, \ |
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.owner = THIS_MODULE, \ |
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.n_voltages = MCP16502_VSEL + 1, \ |
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.linear_ranges = _ranges, \ |
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.linear_min_sel = VDD_LOW_SEL, \ |
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.n_linear_ranges = ARRAY_SIZE(_ranges), \ |
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.of_match = of_match_ptr(_name), \ |
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.of_map_mode = mcp16502_of_map_mode, \ |
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.vsel_reg = (((_id) + 1) << 4), \ |
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.vsel_mask = MCP16502_VSEL, \ |
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.enable_reg = (((_id) + 1) << 4), \ |
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.enable_mask = MCP16502_EN, \ |
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} |
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enum { |
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BUCK1 = 0, |
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BUCK2, |
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BUCK3, |
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BUCK4, |
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LDO1, |
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LDO2, |
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NUM_REGULATORS |
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}; |
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/* |
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* struct mcp16502 - PMIC representation |
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* @lpm: LPM GPIO descriptor |
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*/ |
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struct mcp16502 { |
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struct gpio_desc *lpm; |
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}; |
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/* |
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* mcp16502_gpio_set_mode() - set the GPIO corresponding value |
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* |
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* Used to prepare transitioning into hibernate or resuming from it. |
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*/ |
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static void mcp16502_gpio_set_mode(struct mcp16502 *mcp, int mode) |
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{ |
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switch (mode) { |
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case MCP16502_OPMODE_ACTIVE: |
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gpiod_set_value(mcp->lpm, 0); |
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break; |
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case MCP16502_OPMODE_LPM: |
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case MCP16502_OPMODE_HIB: |
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gpiod_set_value(mcp->lpm, 1); |
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break; |
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default: |
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pr_err("%s: %d invalid\n", __func__, mode); |
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} |
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} |
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/* |
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* mcp16502_get_reg() - get the PMIC's state configuration register for opmode |
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* |
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* @rdev: the regulator whose register we are searching |
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* @opmode: the PMIC's operating mode ACTIVE, Low-power, Hibernate |
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*/ |
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static int mcp16502_get_state_reg(struct regulator_dev *rdev, int opmode) |
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{ |
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switch (opmode) { |
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case MCP16502_OPMODE_ACTIVE: |
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return MCP16502_REG_BASE(rdev_get_id(rdev), A); |
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case MCP16502_OPMODE_LPM: |
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return MCP16502_REG_BASE(rdev_get_id(rdev), LPM); |
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case MCP16502_OPMODE_HIB: |
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return MCP16502_REG_BASE(rdev_get_id(rdev), HIB); |
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default: |
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return -EINVAL; |
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} |
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} |
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/* |
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* mcp16502_get_mode() - return the current operating mode of a regulator |
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* |
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* Note: all functions that are not part of entering/exiting standby/suspend |
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* use the Active mode registers. |
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* |
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* Note: this is different from the PMIC's operatig mode, it is the |
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* MODE bit from the regulator's register. |
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*/ |
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static unsigned int mcp16502_get_mode(struct regulator_dev *rdev) |
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{ |
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unsigned int val; |
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int ret, reg; |
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reg = mcp16502_get_state_reg(rdev, MCP16502_OPMODE_ACTIVE); |
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if (reg < 0) |
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return reg; |
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ret = regmap_read(rdev->regmap, reg, &val); |
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if (ret) |
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return ret; |
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switch (val & MCP16502_MODE) { |
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case MCP16502_MODE_FPWM: |
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return REGULATOR_MODE_NORMAL; |
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case MCP16502_MODE_AUTO_PFM: |
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return REGULATOR_MODE_IDLE; |
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default: |
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return REGULATOR_MODE_INVALID; |
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} |
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} |
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/* |
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* _mcp16502_set_mode() - helper for set_mode and set_suspend_mode |
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* |
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* @rdev: the regulator for which we are setting the mode |
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* @mode: the regulator's mode (the one from MODE bit) |
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* @opmode: the PMIC's operating mode: Active/Low-power/Hibernate |
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*/ |
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static int _mcp16502_set_mode(struct regulator_dev *rdev, unsigned int mode, |
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unsigned int op_mode) |
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{ |
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int val; |
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int reg; |
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reg = mcp16502_get_state_reg(rdev, op_mode); |
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if (reg < 0) |
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return reg; |
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switch (mode) { |
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case REGULATOR_MODE_NORMAL: |
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val = MCP16502_MODE_FPWM; |
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break; |
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case REGULATOR_MODE_IDLE: |
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val = MCP16502_MODE_AUTO_PFM; |
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break; |
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default: |
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return -EINVAL; |
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} |
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reg = regmap_update_bits(rdev->regmap, reg, MCP16502_MODE, val); |
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return reg; |
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} |
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/* |
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* mcp16502_set_mode() - regulator_ops set_mode |
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*/ |
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static int mcp16502_set_mode(struct regulator_dev *rdev, unsigned int mode) |
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{ |
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return _mcp16502_set_mode(rdev, mode, MCP16502_OPMODE_ACTIVE); |
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} |
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/* |
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* mcp16502_get_status() - regulator_ops get_status |
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*/ |
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static int mcp16502_get_status(struct regulator_dev *rdev) |
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{ |
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int ret; |
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unsigned int val; |
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ret = regmap_read(rdev->regmap, MCP16502_STAT_BASE(rdev_get_id(rdev)), |
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&val); |
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if (ret) |
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return ret; |
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if (val & MCP16502_FLT) |
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return REGULATOR_STATUS_ERROR; |
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else if (val & MCP16502_ENS) |
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return REGULATOR_STATUS_ON; |
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else if (!(val & MCP16502_ENS)) |
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return REGULATOR_STATUS_OFF; |
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return REGULATOR_STATUS_UNDEFINED; |
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} |
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static int mcp16502_set_voltage_time_sel(struct regulator_dev *rdev, |
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unsigned int old_sel, |
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unsigned int new_sel) |
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{ |
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static const u8 us_ramp[] = { 8, 16, 24, 32 }; |
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int id = rdev_get_id(rdev); |
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unsigned int uV_delta, val; |
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int ret; |
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ret = regmap_read(rdev->regmap, MCP16502_REG_BASE(id, CFG), &val); |
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if (ret) |
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return ret; |
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val = (val & MCP16502_DVSR) >> 2; |
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uV_delta = abs(new_sel * rdev->desc->linear_ranges->step - |
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old_sel * rdev->desc->linear_ranges->step); |
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switch (id) { |
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case BUCK1: |
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case LDO1: |
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case LDO2: |
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ret = DIV_ROUND_CLOSEST(uV_delta * us_ramp[val], |
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mcp16502_ramp_b1l12[val]); |
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break; |
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case BUCK2: |
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case BUCK3: |
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case BUCK4: |
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ret = DIV_ROUND_CLOSEST(uV_delta * us_ramp[val], |
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mcp16502_ramp_b234[val]); |
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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 ret; |
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} |
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static int mcp16502_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay) |
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{ |
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const int *ramp; |
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int id = rdev_get_id(rdev); |
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unsigned int i, size; |
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switch (id) { |
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case BUCK1: |
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case LDO1: |
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case LDO2: |
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ramp = mcp16502_ramp_b1l12; |
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size = ARRAY_SIZE(mcp16502_ramp_b1l12); |
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break; |
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case BUCK2: |
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case BUCK3: |
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case BUCK4: |
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ramp = mcp16502_ramp_b234; |
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size = ARRAY_SIZE(mcp16502_ramp_b234); |
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break; |
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default: |
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return -EINVAL; |
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} |
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for (i = 0; i < size; i++) { |
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if (ramp[i] == ramp_delay) |
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break; |
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} |
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if (i == size) |
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return -EINVAL; |
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return regmap_update_bits(rdev->regmap, MCP16502_REG_BASE(id, CFG), |
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MCP16502_DVSR, (i << 2)); |
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} |
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#ifdef CONFIG_SUSPEND |
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/* |
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* mcp16502_suspend_get_target_reg() - get the reg of the target suspend PMIC |
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* mode |
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*/ |
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static int mcp16502_suspend_get_target_reg(struct regulator_dev *rdev) |
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{ |
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switch (pm_suspend_target_state) { |
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case PM_SUSPEND_STANDBY: |
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return mcp16502_get_state_reg(rdev, MCP16502_OPMODE_LPM); |
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case PM_SUSPEND_ON: |
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case PM_SUSPEND_MEM: |
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return mcp16502_get_state_reg(rdev, MCP16502_OPMODE_HIB); |
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default: |
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dev_err(&rdev->dev, "invalid suspend target: %d\n", |
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pm_suspend_target_state); |
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} |
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return -EINVAL; |
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} |
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/* |
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* mcp16502_set_suspend_voltage() - regulator_ops set_suspend_voltage |
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*/ |
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static int mcp16502_set_suspend_voltage(struct regulator_dev *rdev, int uV) |
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{ |
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int sel = regulator_map_voltage_linear_range(rdev, uV, uV); |
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int reg = mcp16502_suspend_get_target_reg(rdev); |
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if (sel < 0) |
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return sel; |
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if (reg < 0) |
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return reg; |
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return regmap_update_bits(rdev->regmap, reg, MCP16502_VSEL, sel); |
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} |
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/* |
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* mcp16502_set_suspend_mode() - regulator_ops set_suspend_mode |
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*/ |
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static int mcp16502_set_suspend_mode(struct regulator_dev *rdev, |
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unsigned int mode) |
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{ |
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switch (pm_suspend_target_state) { |
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case PM_SUSPEND_STANDBY: |
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return _mcp16502_set_mode(rdev, mode, MCP16502_OPMODE_LPM); |
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case PM_SUSPEND_ON: |
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case PM_SUSPEND_MEM: |
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return _mcp16502_set_mode(rdev, mode, MCP16502_OPMODE_HIB); |
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default: |
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dev_err(&rdev->dev, "invalid suspend target: %d\n", |
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pm_suspend_target_state); |
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} |
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return -EINVAL; |
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} |
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/* |
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* mcp16502_set_suspend_enable() - regulator_ops set_suspend_enable |
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*/ |
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static int mcp16502_set_suspend_enable(struct regulator_dev *rdev) |
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{ |
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int reg = mcp16502_suspend_get_target_reg(rdev); |
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if (reg < 0) |
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return reg; |
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return regmap_update_bits(rdev->regmap, reg, MCP16502_EN, MCP16502_EN); |
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} |
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/* |
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* mcp16502_set_suspend_disable() - regulator_ops set_suspend_disable |
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*/ |
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static int mcp16502_set_suspend_disable(struct regulator_dev *rdev) |
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{ |
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int reg = mcp16502_suspend_get_target_reg(rdev); |
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if (reg < 0) |
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return reg; |
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return regmap_update_bits(rdev->regmap, reg, MCP16502_EN, 0); |
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} |
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#endif /* CONFIG_SUSPEND */ |
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static const struct regulator_ops mcp16502_buck_ops = { |
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.list_voltage = regulator_list_voltage_linear_range, |
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.map_voltage = regulator_map_voltage_linear_range, |
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.get_voltage_sel = regulator_get_voltage_sel_regmap, |
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.set_voltage_sel = regulator_set_voltage_sel_regmap, |
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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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.get_status = mcp16502_get_status, |
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.set_voltage_time_sel = mcp16502_set_voltage_time_sel, |
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.set_ramp_delay = mcp16502_set_ramp_delay, |
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.set_mode = mcp16502_set_mode, |
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.get_mode = mcp16502_get_mode, |
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#ifdef CONFIG_SUSPEND |
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.set_suspend_voltage = mcp16502_set_suspend_voltage, |
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.set_suspend_mode = mcp16502_set_suspend_mode, |
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.set_suspend_enable = mcp16502_set_suspend_enable, |
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.set_suspend_disable = mcp16502_set_suspend_disable, |
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#endif /* CONFIG_SUSPEND */ |
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}; |
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/* |
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* LDOs cannot change operating modes. |
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*/ |
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static const struct regulator_ops mcp16502_ldo_ops = { |
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.list_voltage = regulator_list_voltage_linear_range, |
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.map_voltage = regulator_map_voltage_linear_range, |
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.get_voltage_sel = regulator_get_voltage_sel_regmap, |
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.set_voltage_sel = regulator_set_voltage_sel_regmap, |
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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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.get_status = mcp16502_get_status, |
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.set_voltage_time_sel = mcp16502_set_voltage_time_sel, |
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.set_ramp_delay = mcp16502_set_ramp_delay, |
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#ifdef CONFIG_SUSPEND |
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.set_suspend_voltage = mcp16502_set_suspend_voltage, |
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.set_suspend_enable = mcp16502_set_suspend_enable, |
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.set_suspend_disable = mcp16502_set_suspend_disable, |
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#endif /* CONFIG_SUSPEND */ |
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}; |
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static const struct of_device_id mcp16502_ids[] = { |
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{ .compatible = "microchip,mcp16502", }, |
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{} |
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}; |
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MODULE_DEVICE_TABLE(of, mcp16502_ids); |
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static const struct linear_range b1l12_ranges[] = { |
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REGULATOR_LINEAR_RANGE(1200000, VDD_LOW_SEL, VDD_HIGH_SEL, 50000), |
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}; |
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static const struct linear_range b234_ranges[] = { |
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REGULATOR_LINEAR_RANGE(600000, VDD_LOW_SEL, VDD_HIGH_SEL, 25000), |
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}; |
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static const struct regulator_desc mcp16502_desc[] = { |
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/* MCP16502_REGULATOR(_name, _id, ranges, regulator_ops) */ |
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MCP16502_REGULATOR("VDD_IO", BUCK1, b1l12_ranges, mcp16502_buck_ops), |
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MCP16502_REGULATOR("VDD_DDR", BUCK2, b234_ranges, mcp16502_buck_ops), |
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MCP16502_REGULATOR("VDD_CORE", BUCK3, b234_ranges, mcp16502_buck_ops), |
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MCP16502_REGULATOR("VDD_OTHER", BUCK4, b234_ranges, mcp16502_buck_ops), |
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MCP16502_REGULATOR("LDO1", LDO1, b1l12_ranges, mcp16502_ldo_ops), |
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MCP16502_REGULATOR("LDO2", LDO2, b1l12_ranges, mcp16502_ldo_ops) |
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}; |
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static const struct regmap_range mcp16502_ranges[] = { |
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regmap_reg_range(MCP16502_MIN_REG, MCP16502_MAX_REG) |
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}; |
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static const struct regmap_access_table mcp16502_yes_reg_table = { |
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.yes_ranges = mcp16502_ranges, |
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.n_yes_ranges = ARRAY_SIZE(mcp16502_ranges), |
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}; |
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static const struct regmap_config mcp16502_regmap_config = { |
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.reg_bits = 8, |
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.val_bits = 8, |
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.max_register = MCP16502_MAX_REG, |
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.cache_type = REGCACHE_NONE, |
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.rd_table = &mcp16502_yes_reg_table, |
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.wr_table = &mcp16502_yes_reg_table, |
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}; |
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static int mcp16502_probe(struct i2c_client *client, |
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const struct i2c_device_id *id) |
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{ |
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struct regulator_config config = { }; |
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struct regulator_dev *rdev; |
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struct device *dev; |
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struct mcp16502 *mcp; |
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struct regmap *rmap; |
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int i, ret; |
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dev = &client->dev; |
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config.dev = dev; |
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|
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mcp = devm_kzalloc(dev, sizeof(*mcp), GFP_KERNEL); |
|
if (!mcp) |
|
return -ENOMEM; |
|
|
|
rmap = devm_regmap_init_i2c(client, &mcp16502_regmap_config); |
|
if (IS_ERR(rmap)) { |
|
ret = PTR_ERR(rmap); |
|
dev_err(dev, "regmap init failed: %d\n", ret); |
|
return ret; |
|
} |
|
|
|
i2c_set_clientdata(client, mcp); |
|
config.regmap = rmap; |
|
config.driver_data = mcp; |
|
|
|
mcp->lpm = devm_gpiod_get_optional(dev, "lpm", GPIOD_OUT_LOW); |
|
if (IS_ERR(mcp->lpm)) { |
|
dev_err(dev, "failed to get lpm pin: %ld\n", PTR_ERR(mcp->lpm)); |
|
return PTR_ERR(mcp->lpm); |
|
} |
|
|
|
for (i = 0; i < NUM_REGULATORS; i++) { |
|
rdev = devm_regulator_register(dev, &mcp16502_desc[i], &config); |
|
if (IS_ERR(rdev)) { |
|
dev_err(dev, |
|
"failed to register %s regulator %ld\n", |
|
mcp16502_desc[i].name, PTR_ERR(rdev)); |
|
return PTR_ERR(rdev); |
|
} |
|
} |
|
|
|
mcp16502_gpio_set_mode(mcp, MCP16502_OPMODE_ACTIVE); |
|
|
|
return 0; |
|
} |
|
|
|
#ifdef CONFIG_PM_SLEEP |
|
static int mcp16502_suspend_noirq(struct device *dev) |
|
{ |
|
struct i2c_client *client = to_i2c_client(dev); |
|
struct mcp16502 *mcp = i2c_get_clientdata(client); |
|
|
|
mcp16502_gpio_set_mode(mcp, MCP16502_OPMODE_LPM); |
|
|
|
return 0; |
|
} |
|
|
|
static int mcp16502_resume_noirq(struct device *dev) |
|
{ |
|
struct i2c_client *client = to_i2c_client(dev); |
|
struct mcp16502 *mcp = i2c_get_clientdata(client); |
|
|
|
mcp16502_gpio_set_mode(mcp, MCP16502_OPMODE_ACTIVE); |
|
|
|
return 0; |
|
} |
|
#endif |
|
|
|
#ifdef CONFIG_PM |
|
static const struct dev_pm_ops mcp16502_pm_ops = { |
|
SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(mcp16502_suspend_noirq, |
|
mcp16502_resume_noirq) |
|
}; |
|
#endif |
|
static const struct i2c_device_id mcp16502_i2c_id[] = { |
|
{ "mcp16502", 0 }, |
|
{ } |
|
}; |
|
MODULE_DEVICE_TABLE(i2c, mcp16502_i2c_id); |
|
|
|
static struct i2c_driver mcp16502_drv = { |
|
.probe = mcp16502_probe, |
|
.driver = { |
|
.name = "mcp16502-regulator", |
|
.of_match_table = of_match_ptr(mcp16502_ids), |
|
#ifdef CONFIG_PM |
|
.pm = &mcp16502_pm_ops, |
|
#endif |
|
}, |
|
.id_table = mcp16502_i2c_id, |
|
}; |
|
|
|
module_i2c_driver(mcp16502_drv); |
|
|
|
MODULE_LICENSE("GPL v2"); |
|
MODULE_DESCRIPTION("MCP16502 PMIC driver"); |
|
MODULE_AUTHOR("Andrei Stefanescu [email protected]");
|
|
|