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316 lines
7.9 KiB
316 lines
7.9 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* max1586.c -- Voltage and current regulation for the Maxim 1586 |
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* |
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* Copyright (C) 2008 Robert Jarzmik |
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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/max1586.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 MAX1586_V3_MAX_VSEL 31 |
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#define MAX1586_V6_MAX_VSEL 3 |
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#define MAX1586_V3_MIN_UV 700000 |
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#define MAX1586_V3_MAX_UV 1475000 |
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#define MAX1586_V6_MIN_UV 0 |
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#define MAX1586_V6_MAX_UV 3000000 |
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#define I2C_V3_SELECT (0 << 5) |
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#define I2C_V6_SELECT (1 << 5) |
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struct max1586_data { |
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struct i2c_client *client; |
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/* min/max V3 voltage */ |
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unsigned int min_uV; |
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unsigned int max_uV; |
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unsigned int v3_curr_sel; |
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unsigned int v6_curr_sel; |
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}; |
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/* |
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* V6 voltage |
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* On I2C bus, sending a "x" byte to the max1586 means : |
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* set V6 to either 0V, 1.8V, 2.5V, 3V depending on (x & 0x3) |
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* As regulator framework doesn't accept voltages to be 0V, we use 1uV. |
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*/ |
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static const unsigned int v6_voltages_uv[] = { 1, 1800000, 2500000, 3000000 }; |
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/* |
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* V3 voltage |
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* On I2C bus, sending a "x" byte to the max1586 means : |
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* set V3 to 0.700V + (x & 0x1f) * 0.025V |
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* This voltage can be increased by external resistors |
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* R24 and R25=100kOhm as described in the data sheet. |
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* The gain is approximately: 1 + R24/R25 + R24/185.5kOhm |
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*/ |
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static int max1586_v3_get_voltage_sel(struct regulator_dev *rdev) |
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{ |
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struct max1586_data *max1586 = rdev_get_drvdata(rdev); |
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return max1586->v3_curr_sel; |
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} |
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static int max1586_v3_set_voltage_sel(struct regulator_dev *rdev, |
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unsigned selector) |
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{ |
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struct max1586_data *max1586 = rdev_get_drvdata(rdev); |
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struct i2c_client *client = max1586->client; |
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int ret; |
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u8 v3_prog; |
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dev_dbg(&client->dev, "changing voltage v3 to %dmv\n", |
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regulator_list_voltage_linear(rdev, selector) / 1000); |
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v3_prog = I2C_V3_SELECT | (u8) selector; |
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ret = i2c_smbus_write_byte(client, v3_prog); |
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if (ret) |
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return ret; |
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max1586->v3_curr_sel = selector; |
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return 0; |
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} |
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static int max1586_v6_get_voltage_sel(struct regulator_dev *rdev) |
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{ |
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struct max1586_data *max1586 = rdev_get_drvdata(rdev); |
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return max1586->v6_curr_sel; |
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} |
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static int max1586_v6_set_voltage_sel(struct regulator_dev *rdev, |
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unsigned int selector) |
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{ |
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struct max1586_data *max1586 = rdev_get_drvdata(rdev); |
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struct i2c_client *client = max1586->client; |
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u8 v6_prog; |
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int ret; |
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dev_dbg(&client->dev, "changing voltage v6 to %dmv\n", |
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rdev->desc->volt_table[selector] / 1000); |
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v6_prog = I2C_V6_SELECT | (u8) selector; |
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ret = i2c_smbus_write_byte(client, v6_prog); |
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if (ret) |
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return ret; |
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max1586->v6_curr_sel = selector; |
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return 0; |
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} |
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/* |
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* The Maxim 1586 controls V3 and V6 voltages, but offers no way of reading back |
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* the set up value. |
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*/ |
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static const struct regulator_ops max1586_v3_ops = { |
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.get_voltage_sel = max1586_v3_get_voltage_sel, |
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.set_voltage_sel = max1586_v3_set_voltage_sel, |
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.list_voltage = regulator_list_voltage_linear, |
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.map_voltage = regulator_map_voltage_linear, |
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}; |
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static const struct regulator_ops max1586_v6_ops = { |
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.get_voltage_sel = max1586_v6_get_voltage_sel, |
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.set_voltage_sel = max1586_v6_set_voltage_sel, |
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.list_voltage = regulator_list_voltage_table, |
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}; |
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static struct regulator_desc max1586_reg[] = { |
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{ |
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.name = "Output_V3", |
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.id = MAX1586_V3, |
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.ops = &max1586_v3_ops, |
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.type = REGULATOR_VOLTAGE, |
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.n_voltages = MAX1586_V3_MAX_VSEL + 1, |
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.owner = THIS_MODULE, |
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}, |
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{ |
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.name = "Output_V6", |
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.id = MAX1586_V6, |
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.ops = &max1586_v6_ops, |
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.type = REGULATOR_VOLTAGE, |
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.n_voltages = MAX1586_V6_MAX_VSEL + 1, |
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.volt_table = v6_voltages_uv, |
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.owner = THIS_MODULE, |
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}, |
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}; |
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static int of_get_max1586_platform_data(struct device *dev, |
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struct max1586_platform_data *pdata) |
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{ |
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struct max1586_subdev_data *sub; |
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struct of_regulator_match rmatch[ARRAY_SIZE(max1586_reg)] = { }; |
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struct device_node *np = dev->of_node; |
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int i, matched; |
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if (of_property_read_u32(np, "v3-gain", |
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&pdata->v3_gain) < 0) { |
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dev_err(dev, "%pOF has no 'v3-gain' property\n", np); |
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return -EINVAL; |
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} |
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np = of_get_child_by_name(np, "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 = max1586_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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/* |
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* If matched is 0, ie. neither Output_V3 nor Output_V6 have been found, |
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* return 0, which signals the normal situation where no subregulator is |
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* available. This is normal because the max1586 doesn't provide any |
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* readback support, so the subregulators can't report any status |
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* anyway. If matched < 0, return the error. |
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*/ |
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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 max1586_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].of_node->name; |
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sub->platform_data = rmatch[i].init_data; |
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sub++; |
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} |
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return 0; |
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} |
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static const struct of_device_id __maybe_unused max1586_of_match[] = { |
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{ .compatible = "maxim,max1586", }, |
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{}, |
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}; |
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MODULE_DEVICE_TABLE(of, max1586_of_match); |
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static int max1586_pmic_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 max1586_platform_data *pdata, pdata_of; |
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struct regulator_config config = { }; |
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struct max1586_data *max1586; |
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int i, id, ret; |
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const struct of_device_id *match; |
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pdata = dev_get_platdata(&client->dev); |
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if (client->dev.of_node && !pdata) { |
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match = of_match_device(of_match_ptr(max1586_of_match), |
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&client->dev); |
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if (!match) { |
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dev_err(&client->dev, "Error: No device match found\n"); |
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return -ENODEV; |
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} |
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ret = of_get_max1586_platform_data(&client->dev, &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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} |
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max1586 = devm_kzalloc(&client->dev, sizeof(struct max1586_data), |
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GFP_KERNEL); |
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if (!max1586) |
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return -ENOMEM; |
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max1586->client = client; |
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if (!pdata->v3_gain) |
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return -EINVAL; |
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max1586->min_uV = MAX1586_V3_MIN_UV / 1000 * pdata->v3_gain / 1000; |
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max1586->max_uV = MAX1586_V3_MAX_UV / 1000 * pdata->v3_gain / 1000; |
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/* Set curr_sel to default voltage on power-up */ |
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max1586->v3_curr_sel = 24; /* 1.3V */ |
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max1586->v6_curr_sel = 0; |
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for (i = 0; i < pdata->num_subdevs && i <= MAX1586_V6; i++) { |
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struct regulator_dev *rdev; |
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id = pdata->subdevs[i].id; |
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if (!pdata->subdevs[i].platform_data) |
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continue; |
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if (id < MAX1586_V3 || id > MAX1586_V6) { |
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dev_err(&client->dev, "invalid regulator id %d\n", id); |
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return -EINVAL; |
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} |
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if (id == MAX1586_V3) { |
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max1586_reg[id].min_uV = max1586->min_uV; |
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max1586_reg[id].uV_step = |
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(max1586->max_uV - max1586->min_uV) / |
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MAX1586_V3_MAX_VSEL; |
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} |
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config.dev = &client->dev; |
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config.init_data = pdata->subdevs[i].platform_data; |
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config.driver_data = max1586; |
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rdev = devm_regulator_register(&client->dev, |
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&max1586_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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max1586_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, max1586); |
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dev_info(&client->dev, "Maxim 1586 regulator driver loaded\n"); |
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return 0; |
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} |
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static const struct i2c_device_id max1586_id[] = { |
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{ "max1586", 0 }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(i2c, max1586_id); |
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static struct i2c_driver max1586_pmic_driver = { |
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.probe = max1586_pmic_probe, |
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.driver = { |
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.name = "max1586", |
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.of_match_table = of_match_ptr(max1586_of_match), |
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}, |
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.id_table = max1586_id, |
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}; |
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static int __init max1586_pmic_init(void) |
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{ |
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return i2c_add_driver(&max1586_pmic_driver); |
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} |
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subsys_initcall(max1586_pmic_init); |
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static void __exit max1586_pmic_exit(void) |
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{ |
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i2c_del_driver(&max1586_pmic_driver); |
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} |
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module_exit(max1586_pmic_exit); |
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/* Module information */ |
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MODULE_DESCRIPTION("MAXIM 1586 voltage regulator driver"); |
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MODULE_AUTHOR("Robert Jarzmik"); |
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MODULE_LICENSE("GPL");
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