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528 lines
13 KiB
528 lines
13 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* max8660.c -- Voltage regulation for the Maxim 8660/8661 |
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* |
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* based on max1586.c and wm8400-regulator.c |
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* |
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* Copyright (C) 2009 Wolfram Sang, Pengutronix e.K. |
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* |
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* Some info: |
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* |
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* Datasheet: http://datasheets.maxim-ic.com/en/ds/MAX8660-MAX8661.pdf |
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* |
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* This chip is a bit nasty because it is a write-only device. Thus, the driver |
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* uses shadow registers to keep track of its values. The main problem appears |
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* to be the initialization: When Linux boots up, we cannot know if the chip is |
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* in the default state or not, so we would have to pass such information in |
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* platform_data. As this adds a bit of complexity to the driver, this is left |
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* out for now until it is really needed. |
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* |
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* [A|S|M]DTV1 registers are currently not used, but [A|S|M]DTV2. |
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* |
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* If the driver is feature complete, it might be worth to check if one set of |
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* functions for V3-V7 is sufficient. For maximum flexibility during |
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* development, they are separated for now. |
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*/ |
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#include <linux/module.h> |
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#include <linux/err.h> |
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#include <linux/i2c.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/slab.h> |
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#include <linux/regulator/max8660.h> |
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#include <linux/of.h> |
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#include <linux/of_device.h> |
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#include <linux/regulator/of_regulator.h> |
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#define MAX8660_DCDC_MIN_UV 725000 |
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#define MAX8660_DCDC_MAX_UV 1800000 |
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#define MAX8660_DCDC_STEP 25000 |
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#define MAX8660_DCDC_MAX_SEL 0x2b |
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#define MAX8660_LDO5_MIN_UV 1700000 |
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#define MAX8660_LDO5_MAX_UV 2000000 |
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#define MAX8660_LDO5_STEP 25000 |
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#define MAX8660_LDO5_MAX_SEL 0x0c |
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#define MAX8660_LDO67_MIN_UV 1800000 |
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#define MAX8660_LDO67_MAX_UV 3300000 |
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#define MAX8660_LDO67_STEP 100000 |
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#define MAX8660_LDO67_MAX_SEL 0x0f |
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enum { |
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MAX8660_OVER1, |
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MAX8660_OVER2, |
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MAX8660_VCC1, |
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MAX8660_ADTV1, |
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MAX8660_ADTV2, |
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MAX8660_SDTV1, |
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MAX8660_SDTV2, |
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MAX8660_MDTV1, |
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MAX8660_MDTV2, |
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MAX8660_L12VCR, |
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MAX8660_FPWM, |
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MAX8660_N_REGS, /* not a real register */ |
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}; |
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struct max8660 { |
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struct i2c_client *client; |
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u8 shadow_regs[MAX8660_N_REGS]; /* as chip is write only */ |
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}; |
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static int max8660_write(struct max8660 *max8660, u8 reg, u8 mask, u8 val) |
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{ |
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static const u8 max8660_addresses[MAX8660_N_REGS] = { |
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0x10, 0x12, 0x20, 0x23, 0x24, 0x29, 0x2a, 0x32, 0x33, 0x39, 0x80 |
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}; |
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int ret; |
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u8 reg_val = (max8660->shadow_regs[reg] & mask) | val; |
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dev_vdbg(&max8660->client->dev, "Writing reg %02x with %02x\n", |
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max8660_addresses[reg], reg_val); |
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ret = i2c_smbus_write_byte_data(max8660->client, |
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max8660_addresses[reg], reg_val); |
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if (ret == 0) |
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max8660->shadow_regs[reg] = reg_val; |
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return ret; |
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} |
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/* |
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* DCDC functions |
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*/ |
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static int max8660_dcdc_is_enabled(struct regulator_dev *rdev) |
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{ |
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struct max8660 *max8660 = rdev_get_drvdata(rdev); |
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u8 val = max8660->shadow_regs[MAX8660_OVER1]; |
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u8 mask = (rdev_get_id(rdev) == MAX8660_V3) ? 1 : 4; |
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return !!(val & mask); |
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} |
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static int max8660_dcdc_enable(struct regulator_dev *rdev) |
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{ |
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struct max8660 *max8660 = rdev_get_drvdata(rdev); |
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u8 bit = (rdev_get_id(rdev) == MAX8660_V3) ? 1 : 4; |
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return max8660_write(max8660, MAX8660_OVER1, 0xff, bit); |
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} |
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static int max8660_dcdc_disable(struct regulator_dev *rdev) |
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{ |
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struct max8660 *max8660 = rdev_get_drvdata(rdev); |
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u8 mask = (rdev_get_id(rdev) == MAX8660_V3) ? ~1 : ~4; |
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return max8660_write(max8660, MAX8660_OVER1, mask, 0); |
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} |
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static int max8660_dcdc_get_voltage_sel(struct regulator_dev *rdev) |
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{ |
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struct max8660 *max8660 = rdev_get_drvdata(rdev); |
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u8 reg = (rdev_get_id(rdev) == MAX8660_V3) ? MAX8660_ADTV2 : MAX8660_SDTV2; |
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u8 selector = max8660->shadow_regs[reg]; |
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return selector; |
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} |
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static int max8660_dcdc_set_voltage_sel(struct regulator_dev *rdev, |
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unsigned int selector) |
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{ |
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struct max8660 *max8660 = rdev_get_drvdata(rdev); |
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u8 reg, bits; |
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int ret; |
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reg = (rdev_get_id(rdev) == MAX8660_V3) ? MAX8660_ADTV2 : MAX8660_SDTV2; |
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ret = max8660_write(max8660, reg, 0, selector); |
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if (ret) |
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return ret; |
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/* Select target voltage register and activate regulation */ |
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bits = (rdev_get_id(rdev) == MAX8660_V3) ? 0x03 : 0x30; |
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return max8660_write(max8660, MAX8660_VCC1, 0xff, bits); |
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} |
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static struct regulator_ops max8660_dcdc_ops = { |
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.is_enabled = max8660_dcdc_is_enabled, |
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.list_voltage = regulator_list_voltage_linear, |
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.map_voltage = regulator_map_voltage_linear, |
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.set_voltage_sel = max8660_dcdc_set_voltage_sel, |
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.get_voltage_sel = max8660_dcdc_get_voltage_sel, |
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}; |
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/* |
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* LDO5 functions |
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*/ |
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static int max8660_ldo5_get_voltage_sel(struct regulator_dev *rdev) |
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{ |
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struct max8660 *max8660 = rdev_get_drvdata(rdev); |
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u8 selector = max8660->shadow_regs[MAX8660_MDTV2]; |
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return selector; |
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} |
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static int max8660_ldo5_set_voltage_sel(struct regulator_dev *rdev, |
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unsigned int selector) |
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{ |
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struct max8660 *max8660 = rdev_get_drvdata(rdev); |
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int ret; |
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ret = max8660_write(max8660, MAX8660_MDTV2, 0, selector); |
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if (ret) |
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return ret; |
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/* Select target voltage register and activate regulation */ |
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return max8660_write(max8660, MAX8660_VCC1, 0xff, 0xc0); |
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} |
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static const struct regulator_ops max8660_ldo5_ops = { |
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.list_voltage = regulator_list_voltage_linear, |
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.map_voltage = regulator_map_voltage_linear, |
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.set_voltage_sel = max8660_ldo5_set_voltage_sel, |
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.get_voltage_sel = max8660_ldo5_get_voltage_sel, |
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}; |
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/* |
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* LDO67 functions |
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*/ |
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static int max8660_ldo67_is_enabled(struct regulator_dev *rdev) |
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{ |
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struct max8660 *max8660 = rdev_get_drvdata(rdev); |
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u8 val = max8660->shadow_regs[MAX8660_OVER2]; |
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u8 mask = (rdev_get_id(rdev) == MAX8660_V6) ? 2 : 4; |
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return !!(val & mask); |
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} |
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static int max8660_ldo67_enable(struct regulator_dev *rdev) |
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{ |
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struct max8660 *max8660 = rdev_get_drvdata(rdev); |
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u8 bit = (rdev_get_id(rdev) == MAX8660_V6) ? 2 : 4; |
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return max8660_write(max8660, MAX8660_OVER2, 0xff, bit); |
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} |
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static int max8660_ldo67_disable(struct regulator_dev *rdev) |
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{ |
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struct max8660 *max8660 = rdev_get_drvdata(rdev); |
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u8 mask = (rdev_get_id(rdev) == MAX8660_V6) ? ~2 : ~4; |
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return max8660_write(max8660, MAX8660_OVER2, mask, 0); |
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} |
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static int max8660_ldo67_get_voltage_sel(struct regulator_dev *rdev) |
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{ |
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struct max8660 *max8660 = rdev_get_drvdata(rdev); |
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u8 shift = (rdev_get_id(rdev) == MAX8660_V6) ? 0 : 4; |
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u8 selector = (max8660->shadow_regs[MAX8660_L12VCR] >> shift) & 0xf; |
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return selector; |
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} |
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static int max8660_ldo67_set_voltage_sel(struct regulator_dev *rdev, |
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unsigned int selector) |
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{ |
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struct max8660 *max8660 = rdev_get_drvdata(rdev); |
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if (rdev_get_id(rdev) == MAX8660_V6) |
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return max8660_write(max8660, MAX8660_L12VCR, 0xf0, selector); |
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else |
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return max8660_write(max8660, MAX8660_L12VCR, 0x0f, |
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selector << 4); |
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} |
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static const struct regulator_ops max8660_ldo67_ops = { |
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.is_enabled = max8660_ldo67_is_enabled, |
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.enable = max8660_ldo67_enable, |
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.disable = max8660_ldo67_disable, |
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.list_voltage = regulator_list_voltage_linear, |
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.map_voltage = regulator_map_voltage_linear, |
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.get_voltage_sel = max8660_ldo67_get_voltage_sel, |
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.set_voltage_sel = max8660_ldo67_set_voltage_sel, |
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}; |
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static const struct regulator_desc max8660_reg[] = { |
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{ |
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.name = "V3(DCDC)", |
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.id = MAX8660_V3, |
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.ops = &max8660_dcdc_ops, |
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.type = REGULATOR_VOLTAGE, |
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.n_voltages = MAX8660_DCDC_MAX_SEL + 1, |
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.owner = THIS_MODULE, |
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.min_uV = MAX8660_DCDC_MIN_UV, |
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.uV_step = MAX8660_DCDC_STEP, |
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}, |
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{ |
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.name = "V4(DCDC)", |
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.id = MAX8660_V4, |
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.ops = &max8660_dcdc_ops, |
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.type = REGULATOR_VOLTAGE, |
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.n_voltages = MAX8660_DCDC_MAX_SEL + 1, |
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.owner = THIS_MODULE, |
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.min_uV = MAX8660_DCDC_MIN_UV, |
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.uV_step = MAX8660_DCDC_STEP, |
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}, |
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{ |
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.name = "V5(LDO)", |
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.id = MAX8660_V5, |
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.ops = &max8660_ldo5_ops, |
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.type = REGULATOR_VOLTAGE, |
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.n_voltages = MAX8660_LDO5_MAX_SEL + 1, |
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.owner = THIS_MODULE, |
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.min_uV = MAX8660_LDO5_MIN_UV, |
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.uV_step = MAX8660_LDO5_STEP, |
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}, |
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{ |
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.name = "V6(LDO)", |
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.id = MAX8660_V6, |
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.ops = &max8660_ldo67_ops, |
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.type = REGULATOR_VOLTAGE, |
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.n_voltages = MAX8660_LDO67_MAX_SEL + 1, |
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.owner = THIS_MODULE, |
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.min_uV = MAX8660_LDO67_MIN_UV, |
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.uV_step = MAX8660_LDO67_STEP, |
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}, |
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{ |
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.name = "V7(LDO)", |
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.id = MAX8660_V7, |
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.ops = &max8660_ldo67_ops, |
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.type = REGULATOR_VOLTAGE, |
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.n_voltages = MAX8660_LDO67_MAX_SEL + 1, |
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.owner = THIS_MODULE, |
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.min_uV = MAX8660_LDO67_MIN_UV, |
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.uV_step = MAX8660_LDO67_STEP, |
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}, |
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}; |
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enum { |
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MAX8660 = 0, |
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MAX8661 = 1, |
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}; |
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#ifdef CONFIG_OF |
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static const struct of_device_id max8660_dt_ids[] = { |
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{ .compatible = "maxim,max8660", .data = (void *) MAX8660 }, |
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{ .compatible = "maxim,max8661", .data = (void *) MAX8661 }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(of, max8660_dt_ids); |
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static int max8660_pdata_from_dt(struct device *dev, |
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struct device_node **of_node, |
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struct max8660_platform_data *pdata) |
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{ |
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int matched, i; |
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struct device_node *np; |
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struct max8660_subdev_data *sub; |
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struct of_regulator_match rmatch[ARRAY_SIZE(max8660_reg)] = { }; |
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np = of_get_child_by_name(dev->of_node, "regulators"); |
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if (!np) { |
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dev_err(dev, "missing 'regulators' subnode in DT\n"); |
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return -EINVAL; |
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} |
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for (i = 0; i < ARRAY_SIZE(rmatch); i++) |
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rmatch[i].name = max8660_reg[i].name; |
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matched = of_regulator_match(dev, np, rmatch, ARRAY_SIZE(rmatch)); |
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of_node_put(np); |
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if (matched <= 0) |
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return matched; |
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pdata->subdevs = devm_kcalloc(dev, |
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matched, |
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sizeof(struct max8660_subdev_data), |
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GFP_KERNEL); |
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if (!pdata->subdevs) |
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return -ENOMEM; |
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pdata->num_subdevs = matched; |
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sub = pdata->subdevs; |
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for (i = 0; i < matched; i++) { |
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sub->id = i; |
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sub->name = rmatch[i].name; |
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sub->platform_data = rmatch[i].init_data; |
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of_node[i] = rmatch[i].of_node; |
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sub++; |
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} |
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return 0; |
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} |
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#else |
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static inline int max8660_pdata_from_dt(struct device *dev, |
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struct device_node **of_node, |
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struct max8660_platform_data *pdata) |
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{ |
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return 0; |
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} |
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#endif |
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static int max8660_probe(struct i2c_client *client, |
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const struct i2c_device_id *i2c_id) |
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{ |
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struct device *dev = &client->dev; |
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struct max8660_platform_data pdata_of, *pdata = dev_get_platdata(dev); |
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struct regulator_config config = { }; |
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struct max8660 *max8660; |
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int boot_on, i, id, ret = -EINVAL; |
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struct device_node *of_node[MAX8660_V_END]; |
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unsigned long type; |
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if (dev->of_node && !pdata) { |
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const struct of_device_id *id; |
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id = of_match_device(of_match_ptr(max8660_dt_ids), dev); |
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if (!id) |
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return -ENODEV; |
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ret = max8660_pdata_from_dt(dev, of_node, &pdata_of); |
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if (ret < 0) |
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return ret; |
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pdata = &pdata_of; |
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type = (unsigned long) id->data; |
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} else { |
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type = i2c_id->driver_data; |
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memset(of_node, 0, sizeof(of_node)); |
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} |
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if (pdata->num_subdevs > MAX8660_V_END) { |
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dev_err(dev, "Too many regulators found!\n"); |
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return -EINVAL; |
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} |
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max8660 = devm_kzalloc(dev, sizeof(struct max8660), GFP_KERNEL); |
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if (!max8660) |
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return -ENOMEM; |
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max8660->client = client; |
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if (pdata->en34_is_high) { |
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/* Simulate always on */ |
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max8660->shadow_regs[MAX8660_OVER1] = 5; |
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} else { |
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/* Otherwise devices can be toggled via software */ |
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max8660_dcdc_ops.enable = max8660_dcdc_enable; |
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max8660_dcdc_ops.disable = max8660_dcdc_disable; |
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} |
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/* |
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* First, set up shadow registers to prevent glitches. As some |
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* registers are shared between regulators, everything must be properly |
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* set up for all regulators in advance. |
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*/ |
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max8660->shadow_regs[MAX8660_ADTV1] = |
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max8660->shadow_regs[MAX8660_ADTV2] = |
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max8660->shadow_regs[MAX8660_SDTV1] = |
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max8660->shadow_regs[MAX8660_SDTV2] = 0x1b; |
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max8660->shadow_regs[MAX8660_MDTV1] = |
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max8660->shadow_regs[MAX8660_MDTV2] = 0x04; |
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for (i = 0; i < pdata->num_subdevs; i++) { |
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if (!pdata->subdevs[i].platform_data) |
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boot_on = false; |
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else |
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boot_on = pdata->subdevs[i].platform_data->constraints.boot_on; |
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switch (pdata->subdevs[i].id) { |
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case MAX8660_V3: |
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if (boot_on) |
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max8660->shadow_regs[MAX8660_OVER1] |= 1; |
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break; |
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case MAX8660_V4: |
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if (boot_on) |
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max8660->shadow_regs[MAX8660_OVER1] |= 4; |
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break; |
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case MAX8660_V5: |
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break; |
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case MAX8660_V6: |
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if (boot_on) |
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max8660->shadow_regs[MAX8660_OVER2] |= 2; |
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break; |
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case MAX8660_V7: |
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if (type == MAX8661) { |
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dev_err(dev, "Regulator not on this chip!\n"); |
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return -EINVAL; |
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} |
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if (boot_on) |
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max8660->shadow_regs[MAX8660_OVER2] |= 4; |
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break; |
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default: |
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dev_err(dev, "invalid regulator %s\n", |
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pdata->subdevs[i].name); |
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return ret; |
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} |
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} |
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/* Finally register devices */ |
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for (i = 0; i < pdata->num_subdevs; i++) { |
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struct regulator_dev *rdev; |
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id = pdata->subdevs[i].id; |
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config.dev = dev; |
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config.init_data = pdata->subdevs[i].platform_data; |
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config.of_node = of_node[i]; |
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config.driver_data = max8660; |
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rdev = devm_regulator_register(&client->dev, |
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&max8660_reg[id], &config); |
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if (IS_ERR(rdev)) { |
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dev_err(&client->dev, "failed to register %s\n", |
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max8660_reg[id].name); |
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return PTR_ERR(rdev); |
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} |
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} |
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i2c_set_clientdata(client, max8660); |
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return 0; |
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} |
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static const struct i2c_device_id max8660_id[] = { |
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{ .name = "max8660", .driver_data = MAX8660 }, |
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{ .name = "max8661", .driver_data = MAX8661 }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(i2c, max8660_id); |
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static struct i2c_driver max8660_driver = { |
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.probe = max8660_probe, |
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.driver = { |
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.name = "max8660", |
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}, |
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.id_table = max8660_id, |
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}; |
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static int __init max8660_init(void) |
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{ |
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return i2c_add_driver(&max8660_driver); |
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} |
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subsys_initcall(max8660_init); |
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static void __exit max8660_exit(void) |
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{ |
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i2c_del_driver(&max8660_driver); |
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} |
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module_exit(max8660_exit); |
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|
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/* Module information */ |
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MODULE_DESCRIPTION("MAXIM 8660/8661 voltage regulator driver"); |
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MODULE_AUTHOR("Wolfram Sang"); |
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MODULE_LICENSE("GPL v2");
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