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9654fbe9cd
The 'struct regulator_dev *rdev' of 'struct max8973_chip' isn't used anywhere in the driver so it can be removed safely. Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com> Signed-off-by: Mark Brown <broonie@linaro.org>
508 lines
14 KiB
C
508 lines
14 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/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/i2c.h>
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#include <linux/slab.h>
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#include <linux/regmap.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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/* 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 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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/* 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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bool valid_dvs_gpio;
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struct regulator_ops ops;
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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 (max->valid_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 (max->valid_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 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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};
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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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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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if (pdata->control_flags & MAX8973_CONTROL_FREQ_SHIFT_9PER_ENABLE)
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control1 |= MAX8973_FREQSHIFT_9PER;
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/* Set ramp delay */
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if (pdata->reg_init_data &&
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pdata->reg_init_data->constraints.ramp_delay) {
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if (pdata->reg_init_data->constraints.ramp_delay < 25000)
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control1 |= MAX8973_RAMP_12mV_PER_US;
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else if (pdata->reg_init_data->constraints.ramp_delay < 50000)
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control1 |= MAX8973_RAMP_25mV_PER_US;
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else if (pdata->reg_init_data->constraints.ramp_delay < 200000)
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control1 |= MAX8973_RAMP_50mV_PER_US;
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else
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control1 |= MAX8973_RAMP_200mV_PER_US;
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} else {
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control1 |= MAX8973_RAMP_12mV_PER_US;
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max->desc.ramp_delay = 12500;
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}
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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;
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}
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ret = regmap_write(max->regmap, MAX8973_CONTROL2, control2);
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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_CONTROL2, ret);
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return ret;
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}
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/* If external control is enabled then disable EN bit */
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if (max->enable_external_control) {
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ret = regmap_update_bits(max->regmap, MAX8973_VOUT,
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MAX8973_VOUT_ENABLE, 0);
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if (ret < 0)
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dev_err(max->dev, "register %d update failed, err = %d",
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MAX8973_VOUT, ret);
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}
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return ret;
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}
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static const struct regmap_config max8973_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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.max_register = MAX8973_CHIPID2,
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.cache_type = REGCACHE_RBTREE,
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};
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static int max8973_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct max8973_regulator_platform_data *pdata;
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struct regulator_config config = { };
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struct regulator_dev *rdev;
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struct max8973_chip *max;
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int ret;
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pdata = dev_get_platdata(&client->dev);
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if (!pdata && !client->dev.of_node) {
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dev_err(&client->dev, "No Platform data");
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return -EIO;
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}
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max = devm_kzalloc(&client->dev, sizeof(*max), GFP_KERNEL);
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if (!max)
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return -ENOMEM;
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max->regmap = devm_regmap_init_i2c(client, &max8973_regmap_config);
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if (IS_ERR(max->regmap)) {
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ret = PTR_ERR(max->regmap);
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dev_err(&client->dev, "regmap init failed, err %d\n", ret);
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return ret;
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}
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i2c_set_clientdata(client, max);
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max->ops = max8973_dcdc_ops;
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max->dev = &client->dev;
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max->desc.name = id->name;
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max->desc.id = 0;
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max->desc.ops = &max->ops;
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max->desc.type = REGULATOR_VOLTAGE;
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max->desc.owner = THIS_MODULE;
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max->desc.min_uV = MAX8973_MIN_VOLATGE;
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max->desc.uV_step = MAX8973_VOLATGE_STEP;
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max->desc.n_voltages = MAX8973_BUCK_N_VOLTAGE;
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if (!pdata || !pdata->enable_ext_control) {
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max->desc.enable_reg = MAX8973_VOUT;
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max->desc.enable_mask = MAX8973_VOUT_ENABLE;
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max->ops.enable = regulator_enable_regmap;
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max->ops.disable = regulator_disable_regmap;
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max->ops.is_enabled = regulator_is_enabled_regmap;
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}
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if (pdata) {
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max->dvs_gpio = pdata->dvs_gpio;
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max->enable_external_control = pdata->enable_ext_control;
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max->curr_gpio_val = pdata->dvs_def_state;
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max->curr_vout_reg = MAX8973_VOUT + pdata->dvs_def_state;
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} else {
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max->dvs_gpio = -EINVAL;
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max->curr_vout_reg = MAX8973_VOUT;
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}
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max->lru_index[0] = max->curr_vout_reg;
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if (gpio_is_valid(max->dvs_gpio)) {
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int gpio_flags;
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int i;
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gpio_flags = (pdata->dvs_def_state) ?
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GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW;
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ret = devm_gpio_request_one(&client->dev, max->dvs_gpio,
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gpio_flags, "max8973-dvs");
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if (ret) {
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dev_err(&client->dev,
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"gpio_request for gpio %d failed, err = %d\n",
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max->dvs_gpio, ret);
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return ret;
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}
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max->valid_dvs_gpio = true;
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/*
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* Initialize the lru index with vout_reg id
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* The index 0 will be most recently used and
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* set with the max->curr_vout_reg */
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for (i = 0; i < MAX8973_MAX_VOUT_REG; ++i)
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max->lru_index[i] = i;
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max->lru_index[0] = max->curr_vout_reg;
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max->lru_index[max->curr_vout_reg] = 0;
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} else {
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max->valid_dvs_gpio = false;
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}
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if (pdata) {
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ret = max8973_init_dcdc(max, pdata);
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if (ret < 0) {
|
|
dev_err(max->dev, "Max8973 Init failed, err = %d\n", ret);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
config.dev = &client->dev;
|
|
config.init_data = pdata ? pdata->reg_init_data :
|
|
of_get_regulator_init_data(&client->dev, client->dev.of_node);
|
|
config.driver_data = max;
|
|
config.of_node = client->dev.of_node;
|
|
config.regmap = max->regmap;
|
|
|
|
/* Register the regulators */
|
|
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;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct i2c_device_id max8973_id[] = {
|
|
{.name = "max8973",},
|
|
{},
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(i2c, max8973_id);
|
|
|
|
static struct i2c_driver max8973_i2c_driver = {
|
|
.driver = {
|
|
.name = "max8973",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
.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");
|