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48bd226f0a
The probe path of this driver is a bit complex: sometimes the
GPIO descriptor is passed to the regulator core, sometimes
it is not.
To handle it in a simple way: stick with the devm_* resource
management and unhinge the GPIO descriptor devres handling
right before passing it to the regulator core, if we pass it
to the regulator core.
Fixes: e7d2be696f
("regulator: max8973: Pass descriptor instead of GPIO number")
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Marek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
860 lines
23 KiB
C
860 lines
23 KiB
C
/*
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* max8973-regulator.c -- Maxim max8973
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*
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* Regulator driver for MAXIM 8973 DC-DC step-down switching regulator.
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*
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* Copyright (c) 2012, NVIDIA Corporation.
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*
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* Author: Laxman Dewangan <ldewangan@nvidia.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 as
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* published by the Free Software Foundation version 2.
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*
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* This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,
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* whether express or implied; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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* 02111-1307, USA
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.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/platform_device.h>
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#include <linux/regulator/driver.h>
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#include <linux/regulator/machine.h>
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#include <linux/regulator/max8973-regulator.h>
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#include <linux/regulator/of_regulator.h>
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#include <linux/gpio.h>
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#include <linux/gpio/consumer.h>
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#include <linux/of_gpio.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/thermal.h>
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#include <linux/irq.h>
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#include <linux/interrupt.h>
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/* Register definitions */
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#define MAX8973_VOUT 0x0
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#define MAX8973_VOUT_DVS 0x1
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#define MAX8973_CONTROL1 0x2
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#define MAX8973_CONTROL2 0x3
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#define MAX8973_CHIPID1 0x4
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#define MAX8973_CHIPID2 0x5
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#define MAX8973_MAX_VOUT_REG 2
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/* MAX8973_VOUT */
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#define MAX8973_VOUT_ENABLE BIT(7)
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#define MAX8973_VOUT_MASK 0x7F
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/* MAX8973_VOUT_DVS */
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#define MAX8973_DVS_VOUT_MASK 0x7F
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/* MAX8973_CONTROL1 */
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#define MAX8973_SNS_ENABLE BIT(7)
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#define MAX8973_FPWM_EN_M BIT(6)
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#define MAX8973_NFSR_ENABLE BIT(5)
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#define MAX8973_AD_ENABLE BIT(4)
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#define MAX8973_BIAS_ENABLE BIT(3)
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#define MAX8973_FREQSHIFT_9PER BIT(2)
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#define MAX8973_RAMP_12mV_PER_US 0x0
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#define MAX8973_RAMP_25mV_PER_US 0x1
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#define MAX8973_RAMP_50mV_PER_US 0x2
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#define MAX8973_RAMP_200mV_PER_US 0x3
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#define MAX8973_RAMP_MASK 0x3
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/* MAX8973_CONTROL2 */
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#define MAX8973_WDTMR_ENABLE BIT(6)
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#define MAX8973_DISCH_ENBABLE BIT(5)
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#define MAX8973_FT_ENABLE BIT(4)
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#define MAX77621_T_JUNCTION_120 BIT(7)
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#define MAX8973_CKKADV_TRIP_MASK 0xC
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#define MAX8973_CKKADV_TRIP_DISABLE 0xC
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#define MAX8973_CKKADV_TRIP_75mV_PER_US 0x0
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#define MAX8973_CKKADV_TRIP_150mV_PER_US 0x4
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#define MAX8973_CKKADV_TRIP_75mV_PER_US_HIST_DIS 0x8
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#define MAX8973_CONTROL_CLKADV_TRIP_MASK 0x00030000
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#define MAX8973_INDUCTOR_MIN_30_PER 0x0
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#define MAX8973_INDUCTOR_NOMINAL 0x1
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#define MAX8973_INDUCTOR_PLUS_30_PER 0x2
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#define MAX8973_INDUCTOR_PLUS_60_PER 0x3
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#define MAX8973_CONTROL_INDUCTOR_VALUE_MASK 0x00300000
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#define MAX8973_MIN_VOLATGE 606250
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#define MAX8973_MAX_VOLATGE 1400000
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#define MAX8973_VOLATGE_STEP 6250
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#define MAX8973_BUCK_N_VOLTAGE 0x80
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#define MAX77621_CHIPID_TJINT_S BIT(0)
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#define MAX77621_NORMAL_OPERATING_TEMP 100000
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#define MAX77621_TJINT_WARNING_TEMP_120 120000
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#define MAX77621_TJINT_WARNING_TEMP_140 140000
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enum device_id {
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MAX8973,
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MAX77621
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};
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/* Maxim 8973 chip information */
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struct max8973_chip {
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struct device *dev;
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struct regulator_desc desc;
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struct regmap *regmap;
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bool enable_external_control;
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int dvs_gpio;
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int lru_index[MAX8973_MAX_VOUT_REG];
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int curr_vout_val[MAX8973_MAX_VOUT_REG];
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int curr_vout_reg;
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int curr_gpio_val;
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struct regulator_ops ops;
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enum device_id id;
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int junction_temp_warning;
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int irq;
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struct thermal_zone_device *tz_device;
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};
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/*
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* find_voltage_set_register: Find new voltage configuration register (VOUT).
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* The finding of the new VOUT register will be based on the LRU mechanism.
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* Each VOUT register will have different voltage configured . This
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* Function will look if any of the VOUT register have requested voltage set
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* or not.
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* - If it is already there then it will make that register as most
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* recently used and return as found so that caller need not to set
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* the VOUT register but need to set the proper gpios to select this
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* VOUT register.
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* - If requested voltage is not found then it will use the least
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* recently mechanism to get new VOUT register for new configuration
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* and will return not_found so that caller need to set new VOUT
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* register and then gpios (both).
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*/
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static bool find_voltage_set_register(struct max8973_chip *tps,
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int req_vsel, int *vout_reg, int *gpio_val)
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{
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int i;
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bool found = false;
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int new_vout_reg = tps->lru_index[MAX8973_MAX_VOUT_REG - 1];
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int found_index = MAX8973_MAX_VOUT_REG - 1;
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for (i = 0; i < MAX8973_MAX_VOUT_REG; ++i) {
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if (tps->curr_vout_val[tps->lru_index[i]] == req_vsel) {
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new_vout_reg = tps->lru_index[i];
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found_index = i;
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found = true;
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goto update_lru_index;
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}
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}
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update_lru_index:
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for (i = found_index; i > 0; i--)
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tps->lru_index[i] = tps->lru_index[i - 1];
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tps->lru_index[0] = new_vout_reg;
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*gpio_val = new_vout_reg;
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*vout_reg = MAX8973_VOUT + new_vout_reg;
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return found;
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}
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static int max8973_dcdc_get_voltage_sel(struct regulator_dev *rdev)
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{
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struct max8973_chip *max = rdev_get_drvdata(rdev);
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unsigned int data;
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int ret;
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ret = regmap_read(max->regmap, max->curr_vout_reg, &data);
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if (ret < 0) {
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dev_err(max->dev, "register %d read failed, err = %d\n",
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max->curr_vout_reg, ret);
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return ret;
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}
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return data & MAX8973_VOUT_MASK;
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}
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static int max8973_dcdc_set_voltage_sel(struct regulator_dev *rdev,
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unsigned vsel)
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{
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struct max8973_chip *max = rdev_get_drvdata(rdev);
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int ret;
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bool found = false;
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int vout_reg = max->curr_vout_reg;
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int gpio_val = max->curr_gpio_val;
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/*
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* If gpios are available to select the VOUT register then least
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* recently used register for new configuration.
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*/
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if (gpio_is_valid(max->dvs_gpio))
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found = find_voltage_set_register(max, vsel,
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&vout_reg, &gpio_val);
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if (!found) {
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ret = regmap_update_bits(max->regmap, vout_reg,
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MAX8973_VOUT_MASK, vsel);
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if (ret < 0) {
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dev_err(max->dev, "register %d update failed, err %d\n",
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vout_reg, ret);
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return ret;
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}
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max->curr_vout_reg = vout_reg;
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max->curr_vout_val[gpio_val] = vsel;
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}
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/* Select proper VOUT register vio gpios */
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if (gpio_is_valid(max->dvs_gpio)) {
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gpio_set_value_cansleep(max->dvs_gpio, gpio_val & 0x1);
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max->curr_gpio_val = gpio_val;
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}
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return 0;
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}
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static int max8973_dcdc_set_mode(struct regulator_dev *rdev, unsigned int mode)
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{
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struct max8973_chip *max = rdev_get_drvdata(rdev);
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int ret;
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int pwm;
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/* Enable force PWM mode in FAST mode only. */
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switch (mode) {
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case REGULATOR_MODE_FAST:
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pwm = MAX8973_FPWM_EN_M;
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break;
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case REGULATOR_MODE_NORMAL:
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pwm = 0;
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break;
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default:
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return -EINVAL;
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}
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ret = regmap_update_bits(max->regmap, MAX8973_CONTROL1,
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MAX8973_FPWM_EN_M, pwm);
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if (ret < 0)
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dev_err(max->dev, "register %d update failed, err %d\n",
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MAX8973_CONTROL1, ret);
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return ret;
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}
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static unsigned int max8973_dcdc_get_mode(struct regulator_dev *rdev)
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{
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struct max8973_chip *max = rdev_get_drvdata(rdev);
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unsigned int data;
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int ret;
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ret = regmap_read(max->regmap, MAX8973_CONTROL1, &data);
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if (ret < 0) {
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dev_err(max->dev, "register %d read failed, err %d\n",
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MAX8973_CONTROL1, ret);
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return ret;
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}
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return (data & MAX8973_FPWM_EN_M) ?
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REGULATOR_MODE_FAST : REGULATOR_MODE_NORMAL;
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}
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static int max8973_set_ramp_delay(struct regulator_dev *rdev,
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int ramp_delay)
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{
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struct max8973_chip *max = rdev_get_drvdata(rdev);
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unsigned int control;
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int ret;
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/* Set ramp delay */
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if (ramp_delay <= 12000)
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control = MAX8973_RAMP_12mV_PER_US;
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else if (ramp_delay <= 25000)
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control = MAX8973_RAMP_25mV_PER_US;
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else if (ramp_delay <= 50000)
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control = MAX8973_RAMP_50mV_PER_US;
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else if (ramp_delay <= 200000)
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control = MAX8973_RAMP_200mV_PER_US;
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else
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return -EINVAL;
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ret = regmap_update_bits(max->regmap, MAX8973_CONTROL1,
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MAX8973_RAMP_MASK, control);
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if (ret < 0)
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dev_err(max->dev, "register %d update failed, %d",
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MAX8973_CONTROL1, ret);
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return ret;
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}
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static int max8973_set_current_limit(struct regulator_dev *rdev,
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int min_ua, int max_ua)
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{
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struct max8973_chip *max = rdev_get_drvdata(rdev);
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unsigned int val;
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int ret;
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if (max_ua <= 9000000)
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val = MAX8973_CKKADV_TRIP_75mV_PER_US;
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else if (max_ua <= 12000000)
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val = MAX8973_CKKADV_TRIP_150mV_PER_US;
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else
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val = MAX8973_CKKADV_TRIP_DISABLE;
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ret = regmap_update_bits(max->regmap, MAX8973_CONTROL2,
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MAX8973_CKKADV_TRIP_MASK, val);
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if (ret < 0) {
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dev_err(max->dev, "register %d update failed: %d\n",
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MAX8973_CONTROL2, ret);
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return ret;
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}
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return 0;
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}
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static int max8973_get_current_limit(struct regulator_dev *rdev)
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{
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struct max8973_chip *max = rdev_get_drvdata(rdev);
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unsigned int control2;
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int ret;
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ret = regmap_read(max->regmap, MAX8973_CONTROL2, &control2);
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if (ret < 0) {
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dev_err(max->dev, "register %d read failed: %d\n",
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MAX8973_CONTROL2, ret);
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return ret;
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}
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switch (control2 & MAX8973_CKKADV_TRIP_MASK) {
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case MAX8973_CKKADV_TRIP_DISABLE:
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return 15000000;
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case MAX8973_CKKADV_TRIP_150mV_PER_US:
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return 12000000;
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case MAX8973_CKKADV_TRIP_75mV_PER_US:
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return 9000000;
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default:
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break;
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}
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return 9000000;
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}
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static const struct regulator_ops max8973_dcdc_ops = {
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.get_voltage_sel = max8973_dcdc_get_voltage_sel,
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.set_voltage_sel = max8973_dcdc_set_voltage_sel,
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.list_voltage = regulator_list_voltage_linear,
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.set_mode = max8973_dcdc_set_mode,
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.get_mode = max8973_dcdc_get_mode,
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.set_voltage_time_sel = regulator_set_voltage_time_sel,
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.set_ramp_delay = max8973_set_ramp_delay,
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};
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static int max8973_init_dcdc(struct max8973_chip *max,
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struct max8973_regulator_platform_data *pdata)
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{
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int ret;
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uint8_t control1 = 0;
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uint8_t control2 = 0;
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unsigned int data;
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ret = regmap_read(max->regmap, MAX8973_CONTROL1, &data);
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if (ret < 0) {
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dev_err(max->dev, "register %d read failed, err = %d",
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MAX8973_CONTROL1, ret);
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return ret;
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}
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control1 = data & MAX8973_RAMP_MASK;
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switch (control1) {
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case MAX8973_RAMP_12mV_PER_US:
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max->desc.ramp_delay = 12000;
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break;
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case MAX8973_RAMP_25mV_PER_US:
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max->desc.ramp_delay = 25000;
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break;
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case MAX8973_RAMP_50mV_PER_US:
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max->desc.ramp_delay = 50000;
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break;
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case MAX8973_RAMP_200mV_PER_US:
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max->desc.ramp_delay = 200000;
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break;
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}
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if (pdata->control_flags & MAX8973_CONTROL_REMOTE_SENSE_ENABLE)
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control1 |= MAX8973_SNS_ENABLE;
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if (!(pdata->control_flags & MAX8973_CONTROL_FALLING_SLEW_RATE_ENABLE))
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control1 |= MAX8973_NFSR_ENABLE;
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if (pdata->control_flags & MAX8973_CONTROL_OUTPUT_ACTIVE_DISCH_ENABLE)
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control1 |= MAX8973_AD_ENABLE;
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if (pdata->control_flags & MAX8973_CONTROL_BIAS_ENABLE) {
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control1 |= MAX8973_BIAS_ENABLE;
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max->desc.enable_time = 20;
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} else {
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max->desc.enable_time = 240;
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}
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if (pdata->control_flags & MAX8973_CONTROL_FREQ_SHIFT_9PER_ENABLE)
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control1 |= MAX8973_FREQSHIFT_9PER;
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if ((pdata->junction_temp_warning == MAX77621_TJINT_WARNING_TEMP_120) &&
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(max->id == MAX77621))
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control2 |= MAX77621_T_JUNCTION_120;
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if (!(pdata->control_flags & MAX8973_CONTROL_PULL_DOWN_ENABLE))
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control2 |= MAX8973_DISCH_ENBABLE;
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/* Clock advance trip configuration */
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switch (pdata->control_flags & MAX8973_CONTROL_CLKADV_TRIP_MASK) {
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case MAX8973_CONTROL_CLKADV_TRIP_DISABLED:
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control2 |= MAX8973_CKKADV_TRIP_DISABLE;
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break;
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case MAX8973_CONTROL_CLKADV_TRIP_75mV_PER_US:
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control2 |= MAX8973_CKKADV_TRIP_75mV_PER_US;
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break;
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case MAX8973_CONTROL_CLKADV_TRIP_150mV_PER_US:
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control2 |= MAX8973_CKKADV_TRIP_150mV_PER_US;
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break;
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case MAX8973_CONTROL_CLKADV_TRIP_75mV_PER_US_HIST_DIS:
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control2 |= MAX8973_CKKADV_TRIP_75mV_PER_US_HIST_DIS;
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break;
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}
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/* Configure inductor value */
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switch (pdata->control_flags & MAX8973_CONTROL_INDUCTOR_VALUE_MASK) {
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case MAX8973_CONTROL_INDUCTOR_VALUE_NOMINAL:
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control2 |= MAX8973_INDUCTOR_NOMINAL;
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break;
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case MAX8973_CONTROL_INDUCTOR_VALUE_MINUS_30_PER:
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control2 |= MAX8973_INDUCTOR_MIN_30_PER;
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break;
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case MAX8973_CONTROL_INDUCTOR_VALUE_PLUS_30_PER:
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control2 |= MAX8973_INDUCTOR_PLUS_30_PER;
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break;
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case MAX8973_CONTROL_INDUCTOR_VALUE_PLUS_60_PER:
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control2 |= MAX8973_INDUCTOR_PLUS_60_PER;
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break;
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}
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ret = regmap_write(max->regmap, MAX8973_CONTROL1, control1);
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if (ret < 0) {
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dev_err(max->dev, "register %d write failed, err = %d",
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MAX8973_CONTROL1, ret);
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return ret;
|
|
}
|
|
|
|
ret = regmap_write(max->regmap, MAX8973_CONTROL2, control2);
|
|
if (ret < 0) {
|
|
dev_err(max->dev, "register %d write failed, err = %d",
|
|
MAX8973_CONTROL2, ret);
|
|
return ret;
|
|
}
|
|
|
|
/* If external control is enabled then disable EN bit */
|
|
if (max->enable_external_control && (max->id == MAX8973)) {
|
|
ret = regmap_update_bits(max->regmap, MAX8973_VOUT,
|
|
MAX8973_VOUT_ENABLE, 0);
|
|
if (ret < 0)
|
|
dev_err(max->dev, "register %d update failed, err = %d",
|
|
MAX8973_VOUT, ret);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int max8973_thermal_read_temp(void *data, int *temp)
|
|
{
|
|
struct max8973_chip *mchip = data;
|
|
unsigned int val;
|
|
int ret;
|
|
|
|
ret = regmap_read(mchip->regmap, MAX8973_CHIPID1, &val);
|
|
if (ret < 0) {
|
|
dev_err(mchip->dev, "Failed to read register CHIPID1, %d", ret);
|
|
return ret;
|
|
}
|
|
|
|
/* +1 degC to trigger cool devive */
|
|
if (val & MAX77621_CHIPID_TJINT_S)
|
|
*temp = mchip->junction_temp_warning + 1000;
|
|
else
|
|
*temp = MAX77621_NORMAL_OPERATING_TEMP;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static irqreturn_t max8973_thermal_irq(int irq, void *data)
|
|
{
|
|
struct max8973_chip *mchip = data;
|
|
|
|
thermal_zone_device_update(mchip->tz_device,
|
|
THERMAL_EVENT_UNSPECIFIED);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static const struct thermal_zone_of_device_ops max77621_tz_ops = {
|
|
.get_temp = max8973_thermal_read_temp,
|
|
};
|
|
|
|
static int max8973_thermal_init(struct max8973_chip *mchip)
|
|
{
|
|
struct thermal_zone_device *tzd;
|
|
struct irq_data *irq_data;
|
|
unsigned long irq_flags = 0;
|
|
int ret;
|
|
|
|
if (mchip->id != MAX77621)
|
|
return 0;
|
|
|
|
tzd = devm_thermal_zone_of_sensor_register(mchip->dev, 0, mchip,
|
|
&max77621_tz_ops);
|
|
if (IS_ERR(tzd)) {
|
|
ret = PTR_ERR(tzd);
|
|
dev_err(mchip->dev, "Failed to register thermal sensor: %d\n",
|
|
ret);
|
|
return ret;
|
|
}
|
|
|
|
if (mchip->irq <= 0)
|
|
return 0;
|
|
|
|
irq_data = irq_get_irq_data(mchip->irq);
|
|
if (irq_data)
|
|
irq_flags = irqd_get_trigger_type(irq_data);
|
|
|
|
ret = devm_request_threaded_irq(mchip->dev, mchip->irq, NULL,
|
|
max8973_thermal_irq,
|
|
IRQF_ONESHOT | IRQF_SHARED | irq_flags,
|
|
dev_name(mchip->dev), mchip);
|
|
if (ret < 0) {
|
|
dev_err(mchip->dev, "Failed to request irq %d, %d\n",
|
|
mchip->irq, ret);
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct regmap_config max8973_regmap_config = {
|
|
.reg_bits = 8,
|
|
.val_bits = 8,
|
|
.max_register = MAX8973_CHIPID2,
|
|
.cache_type = REGCACHE_RBTREE,
|
|
};
|
|
|
|
static struct max8973_regulator_platform_data *max8973_parse_dt(
|
|
struct device *dev)
|
|
{
|
|
struct max8973_regulator_platform_data *pdata;
|
|
struct device_node *np = dev->of_node;
|
|
int ret;
|
|
u32 pval;
|
|
bool etr_enable;
|
|
bool etr_sensitivity_high;
|
|
|
|
pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
|
|
if (!pdata)
|
|
return NULL;
|
|
|
|
pdata->enable_ext_control = of_property_read_bool(np,
|
|
"maxim,externally-enable");
|
|
pdata->dvs_gpio = of_get_named_gpio(np, "maxim,dvs-gpio", 0);
|
|
|
|
ret = of_property_read_u32(np, "maxim,dvs-default-state", &pval);
|
|
if (!ret)
|
|
pdata->dvs_def_state = pval;
|
|
|
|
if (of_property_read_bool(np, "maxim,enable-remote-sense"))
|
|
pdata->control_flags |= MAX8973_CONTROL_REMOTE_SENSE_ENABLE;
|
|
|
|
if (of_property_read_bool(np, "maxim,enable-falling-slew-rate"))
|
|
pdata->control_flags |=
|
|
MAX8973_CONTROL_FALLING_SLEW_RATE_ENABLE;
|
|
|
|
if (of_property_read_bool(np, "maxim,enable-active-discharge"))
|
|
pdata->control_flags |=
|
|
MAX8973_CONTROL_OUTPUT_ACTIVE_DISCH_ENABLE;
|
|
|
|
if (of_property_read_bool(np, "maxim,enable-frequency-shift"))
|
|
pdata->control_flags |= MAX8973_CONTROL_FREQ_SHIFT_9PER_ENABLE;
|
|
|
|
if (of_property_read_bool(np, "maxim,enable-bias-control"))
|
|
pdata->control_flags |= MAX8973_CONTROL_BIAS_ENABLE;
|
|
|
|
etr_enable = of_property_read_bool(np, "maxim,enable-etr");
|
|
etr_sensitivity_high = of_property_read_bool(np,
|
|
"maxim,enable-high-etr-sensitivity");
|
|
if (etr_sensitivity_high)
|
|
etr_enable = true;
|
|
|
|
if (etr_enable) {
|
|
if (etr_sensitivity_high)
|
|
pdata->control_flags |=
|
|
MAX8973_CONTROL_CLKADV_TRIP_75mV_PER_US;
|
|
else
|
|
pdata->control_flags |=
|
|
MAX8973_CONTROL_CLKADV_TRIP_150mV_PER_US;
|
|
} else {
|
|
pdata->control_flags |= MAX8973_CONTROL_CLKADV_TRIP_DISABLED;
|
|
}
|
|
|
|
pdata->junction_temp_warning = MAX77621_TJINT_WARNING_TEMP_140;
|
|
ret = of_property_read_u32(np, "junction-warn-millicelsius", &pval);
|
|
if (!ret && (pval <= MAX77621_TJINT_WARNING_TEMP_120))
|
|
pdata->junction_temp_warning = MAX77621_TJINT_WARNING_TEMP_120;
|
|
|
|
return pdata;
|
|
}
|
|
|
|
static const struct of_device_id of_max8973_match_tbl[] = {
|
|
{ .compatible = "maxim,max8973", .data = (void *)MAX8973, },
|
|
{ .compatible = "maxim,max77621", .data = (void *)MAX77621, },
|
|
{ },
|
|
};
|
|
MODULE_DEVICE_TABLE(of, of_max8973_match_tbl);
|
|
|
|
static int max8973_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct max8973_regulator_platform_data *pdata;
|
|
struct regulator_init_data *ridata;
|
|
struct regulator_config config = { };
|
|
struct regulator_dev *rdev;
|
|
struct max8973_chip *max;
|
|
bool pdata_from_dt = false;
|
|
unsigned int chip_id;
|
|
struct gpio_desc *gpiod;
|
|
enum gpiod_flags gflags;
|
|
int ret;
|
|
|
|
pdata = dev_get_platdata(&client->dev);
|
|
|
|
if (!pdata && client->dev.of_node) {
|
|
pdata = max8973_parse_dt(&client->dev);
|
|
pdata_from_dt = true;
|
|
}
|
|
|
|
if (!pdata) {
|
|
dev_err(&client->dev, "No Platform data");
|
|
return -EIO;
|
|
}
|
|
|
|
if (pdata->dvs_gpio == -EPROBE_DEFER)
|
|
return -EPROBE_DEFER;
|
|
|
|
max = devm_kzalloc(&client->dev, sizeof(*max), GFP_KERNEL);
|
|
if (!max)
|
|
return -ENOMEM;
|
|
|
|
max->regmap = devm_regmap_init_i2c(client, &max8973_regmap_config);
|
|
if (IS_ERR(max->regmap)) {
|
|
ret = PTR_ERR(max->regmap);
|
|
dev_err(&client->dev, "regmap init failed, err %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
if (client->dev.of_node) {
|
|
const struct of_device_id *match;
|
|
|
|
match = of_match_device(of_match_ptr(of_max8973_match_tbl),
|
|
&client->dev);
|
|
if (!match)
|
|
return -ENODATA;
|
|
max->id = (u32)((uintptr_t)match->data);
|
|
} else {
|
|
max->id = id->driver_data;
|
|
}
|
|
|
|
ret = regmap_read(max->regmap, MAX8973_CHIPID1, &chip_id);
|
|
if (ret < 0) {
|
|
dev_err(&client->dev, "register CHIPID1 read failed, %d", ret);
|
|
return ret;
|
|
}
|
|
|
|
dev_info(&client->dev, "CHIP-ID OTP: 0x%02x ID_M: 0x%02x\n",
|
|
(chip_id >> 4) & 0xF, (chip_id >> 1) & 0x7);
|
|
|
|
i2c_set_clientdata(client, max);
|
|
max->ops = max8973_dcdc_ops;
|
|
max->dev = &client->dev;
|
|
max->desc.name = id->name;
|
|
max->desc.id = 0;
|
|
max->desc.ops = &max->ops;
|
|
max->desc.type = REGULATOR_VOLTAGE;
|
|
max->desc.owner = THIS_MODULE;
|
|
max->desc.min_uV = MAX8973_MIN_VOLATGE;
|
|
max->desc.uV_step = MAX8973_VOLATGE_STEP;
|
|
max->desc.n_voltages = MAX8973_BUCK_N_VOLTAGE;
|
|
|
|
max->dvs_gpio = (pdata->dvs_gpio) ? pdata->dvs_gpio : -EINVAL;
|
|
max->enable_external_control = pdata->enable_ext_control;
|
|
max->curr_gpio_val = pdata->dvs_def_state;
|
|
max->curr_vout_reg = MAX8973_VOUT + pdata->dvs_def_state;
|
|
max->junction_temp_warning = pdata->junction_temp_warning;
|
|
|
|
max->lru_index[0] = max->curr_vout_reg;
|
|
|
|
if (gpio_is_valid(max->dvs_gpio)) {
|
|
int gpio_flags;
|
|
int i;
|
|
|
|
gpio_flags = (pdata->dvs_def_state) ?
|
|
GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW;
|
|
ret = devm_gpio_request_one(&client->dev, max->dvs_gpio,
|
|
gpio_flags, "max8973-dvs");
|
|
if (ret) {
|
|
dev_err(&client->dev,
|
|
"gpio_request for gpio %d failed, err = %d\n",
|
|
max->dvs_gpio, ret);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Initialize the lru index with vout_reg id
|
|
* The index 0 will be most recently used and
|
|
* set with the max->curr_vout_reg */
|
|
for (i = 0; i < MAX8973_MAX_VOUT_REG; ++i)
|
|
max->lru_index[i] = i;
|
|
max->lru_index[0] = max->curr_vout_reg;
|
|
max->lru_index[max->curr_vout_reg] = 0;
|
|
} else {
|
|
/*
|
|
* If there is no DVS GPIO, the VOUT register
|
|
* address is fixed.
|
|
*/
|
|
max->ops.set_voltage_sel = regulator_set_voltage_sel_regmap;
|
|
max->ops.get_voltage_sel = regulator_get_voltage_sel_regmap;
|
|
max->desc.vsel_reg = max->curr_vout_reg;
|
|
max->desc.vsel_mask = MAX8973_VOUT_MASK;
|
|
}
|
|
|
|
if (pdata_from_dt)
|
|
pdata->reg_init_data = of_get_regulator_init_data(&client->dev,
|
|
client->dev.of_node, &max->desc);
|
|
|
|
ridata = pdata->reg_init_data;
|
|
switch (max->id) {
|
|
case MAX8973:
|
|
if (!pdata->enable_ext_control) {
|
|
max->desc.enable_reg = MAX8973_VOUT;
|
|
max->desc.enable_mask = MAX8973_VOUT_ENABLE;
|
|
max->ops.enable = regulator_enable_regmap;
|
|
max->ops.disable = regulator_disable_regmap;
|
|
max->ops.is_enabled = regulator_is_enabled_regmap;
|
|
break;
|
|
}
|
|
|
|
if (ridata && (ridata->constraints.always_on ||
|
|
ridata->constraints.boot_on))
|
|
gflags = GPIOD_OUT_HIGH;
|
|
else
|
|
gflags = GPIOD_OUT_LOW;
|
|
gflags |= GPIOD_FLAGS_BIT_NONEXCLUSIVE;
|
|
gpiod = devm_gpiod_get_optional(&client->dev,
|
|
"maxim,enable",
|
|
gflags);
|
|
if (IS_ERR(gpiod))
|
|
return PTR_ERR(gpiod);
|
|
if (gpiod) {
|
|
config.ena_gpiod = gpiod;
|
|
max->enable_external_control = true;
|
|
}
|
|
|
|
break;
|
|
|
|
case MAX77621:
|
|
/*
|
|
* We do not let the core switch this regulator on/off,
|
|
* we just leave it on.
|
|
*/
|
|
gpiod = devm_gpiod_get_optional(&client->dev,
|
|
"maxim,enable",
|
|
GPIOD_OUT_HIGH);
|
|
if (IS_ERR(gpiod))
|
|
return PTR_ERR(gpiod);
|
|
if (gpiod)
|
|
max->enable_external_control = true;
|
|
|
|
max->desc.enable_reg = MAX8973_VOUT;
|
|
max->desc.enable_mask = MAX8973_VOUT_ENABLE;
|
|
max->ops.enable = regulator_enable_regmap;
|
|
max->ops.disable = regulator_disable_regmap;
|
|
max->ops.is_enabled = regulator_is_enabled_regmap;
|
|
max->ops.set_current_limit = max8973_set_current_limit;
|
|
max->ops.get_current_limit = max8973_get_current_limit;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
ret = max8973_init_dcdc(max, pdata);
|
|
if (ret < 0) {
|
|
dev_err(max->dev, "Max8973 Init failed, err = %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
config.dev = &client->dev;
|
|
config.init_data = pdata->reg_init_data;
|
|
config.driver_data = max;
|
|
config.of_node = client->dev.of_node;
|
|
config.regmap = max->regmap;
|
|
|
|
/*
|
|
* Register the regulators
|
|
* Turn the GPIO descriptor over to the regulator core for
|
|
* lifecycle management if we pass an ena_gpiod.
|
|
*/
|
|
if (config.ena_gpiod)
|
|
devm_gpiod_unhinge(&client->dev, config.ena_gpiod);
|
|
rdev = devm_regulator_register(&client->dev, &max->desc, &config);
|
|
if (IS_ERR(rdev)) {
|
|
ret = PTR_ERR(rdev);
|
|
dev_err(max->dev, "regulator register failed, err %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
max8973_thermal_init(max);
|
|
return 0;
|
|
}
|
|
|
|
static const struct i2c_device_id max8973_id[] = {
|
|
{.name = "max8973", .driver_data = MAX8973},
|
|
{.name = "max77621", .driver_data = MAX77621},
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, max8973_id);
|
|
|
|
static struct i2c_driver max8973_i2c_driver = {
|
|
.driver = {
|
|
.name = "max8973",
|
|
.of_match_table = of_max8973_match_tbl,
|
|
},
|
|
.probe = max8973_probe,
|
|
.id_table = max8973_id,
|
|
};
|
|
|
|
static int __init max8973_init(void)
|
|
{
|
|
return i2c_add_driver(&max8973_i2c_driver);
|
|
}
|
|
subsys_initcall(max8973_init);
|
|
|
|
static void __exit max8973_cleanup(void)
|
|
{
|
|
i2c_del_driver(&max8973_i2c_driver);
|
|
}
|
|
module_exit(max8973_cleanup);
|
|
|
|
MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
|
|
MODULE_DESCRIPTION("MAX8973 voltage regulator driver");
|
|
MODULE_LICENSE("GPL v2");
|