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214 lines
5.3 KiB
214 lines
5.3 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* AS3711 PMIC MFC driver |
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* |
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* Copyright (C) 2012 Renesas Electronics Corporation |
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* Author: Guennadi Liakhovetski, <[email protected]> |
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*/ |
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#include <linux/device.h> |
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#include <linux/err.h> |
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#include <linux/i2c.h> |
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#include <linux/init.h> |
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#include <linux/kernel.h> |
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#include <linux/mfd/as3711.h> |
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#include <linux/mfd/core.h> |
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#include <linux/of.h> |
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#include <linux/regmap.h> |
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#include <linux/slab.h> |
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enum { |
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AS3711_REGULATOR, |
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AS3711_BACKLIGHT, |
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}; |
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/* |
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* Ok to have it static: it is only used during probing and multiple I2C devices |
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* cannot be probed simultaneously. Just make sure to avoid stale data. |
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*/ |
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static struct mfd_cell as3711_subdevs[] = { |
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[AS3711_REGULATOR] = {.name = "as3711-regulator",}, |
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[AS3711_BACKLIGHT] = {.name = "as3711-backlight",}, |
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}; |
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static bool as3711_volatile_reg(struct device *dev, unsigned int reg) |
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{ |
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switch (reg) { |
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case AS3711_GPIO_SIGNAL_IN: |
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case AS3711_INTERRUPT_STATUS_1: |
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case AS3711_INTERRUPT_STATUS_2: |
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case AS3711_INTERRUPT_STATUS_3: |
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case AS3711_CHARGER_STATUS_1: |
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case AS3711_CHARGER_STATUS_2: |
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case AS3711_REG_STATUS: |
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return true; |
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} |
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return false; |
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} |
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static bool as3711_precious_reg(struct device *dev, unsigned int reg) |
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{ |
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switch (reg) { |
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case AS3711_INTERRUPT_STATUS_1: |
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case AS3711_INTERRUPT_STATUS_2: |
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case AS3711_INTERRUPT_STATUS_3: |
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return true; |
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} |
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return false; |
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} |
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static bool as3711_readable_reg(struct device *dev, unsigned int reg) |
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{ |
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switch (reg) { |
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case AS3711_SD_1_VOLTAGE: |
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case AS3711_SD_2_VOLTAGE: |
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case AS3711_SD_3_VOLTAGE: |
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case AS3711_SD_4_VOLTAGE: |
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case AS3711_LDO_1_VOLTAGE: |
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case AS3711_LDO_2_VOLTAGE: |
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case AS3711_LDO_3_VOLTAGE: |
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case AS3711_LDO_4_VOLTAGE: |
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case AS3711_LDO_5_VOLTAGE: |
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case AS3711_LDO_6_VOLTAGE: |
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case AS3711_LDO_7_VOLTAGE: |
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case AS3711_LDO_8_VOLTAGE: |
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case AS3711_SD_CONTROL: |
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case AS3711_GPIO_SIGNAL_OUT: |
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case AS3711_GPIO_SIGNAL_IN: |
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case AS3711_SD_CONTROL_1: |
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case AS3711_SD_CONTROL_2: |
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case AS3711_CURR_CONTROL: |
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case AS3711_CURR1_VALUE: |
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case AS3711_CURR2_VALUE: |
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case AS3711_CURR3_VALUE: |
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case AS3711_STEPUP_CONTROL_1: |
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case AS3711_STEPUP_CONTROL_2: |
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case AS3711_STEPUP_CONTROL_4: |
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case AS3711_STEPUP_CONTROL_5: |
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case AS3711_REG_STATUS: |
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case AS3711_INTERRUPT_STATUS_1: |
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case AS3711_INTERRUPT_STATUS_2: |
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case AS3711_INTERRUPT_STATUS_3: |
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case AS3711_CHARGER_STATUS_1: |
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case AS3711_CHARGER_STATUS_2: |
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case AS3711_ASIC_ID_1: |
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case AS3711_ASIC_ID_2: |
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return true; |
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} |
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return false; |
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} |
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static const struct regmap_config as3711_regmap_config = { |
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.reg_bits = 8, |
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.val_bits = 8, |
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.volatile_reg = as3711_volatile_reg, |
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.readable_reg = as3711_readable_reg, |
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.precious_reg = as3711_precious_reg, |
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.max_register = AS3711_MAX_REG, |
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.num_reg_defaults_raw = AS3711_NUM_REGS, |
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.cache_type = REGCACHE_RBTREE, |
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}; |
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#ifdef CONFIG_OF |
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static const struct of_device_id as3711_of_match[] = { |
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{.compatible = "ams,as3711",}, |
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{} |
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}; |
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#endif |
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static int as3711_i2c_probe(struct i2c_client *client, |
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const struct i2c_device_id *id) |
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{ |
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struct as3711 *as3711; |
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struct as3711_platform_data *pdata; |
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unsigned int id1, id2; |
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int ret; |
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if (!client->dev.of_node) { |
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pdata = dev_get_platdata(&client->dev); |
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if (!pdata) |
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dev_dbg(&client->dev, "Platform data not found\n"); |
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} else { |
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pdata = devm_kzalloc(&client->dev, |
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sizeof(*pdata), GFP_KERNEL); |
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if (!pdata) |
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return -ENOMEM; |
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} |
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as3711 = devm_kzalloc(&client->dev, sizeof(struct as3711), GFP_KERNEL); |
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if (!as3711) |
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return -ENOMEM; |
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as3711->dev = &client->dev; |
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i2c_set_clientdata(client, as3711); |
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if (client->irq) |
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dev_notice(&client->dev, "IRQ not supported yet\n"); |
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as3711->regmap = devm_regmap_init_i2c(client, &as3711_regmap_config); |
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if (IS_ERR(as3711->regmap)) { |
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ret = PTR_ERR(as3711->regmap); |
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dev_err(&client->dev, |
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"regmap initialization failed: %d\n", ret); |
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return ret; |
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} |
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ret = regmap_read(as3711->regmap, AS3711_ASIC_ID_1, &id1); |
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if (!ret) |
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ret = regmap_read(as3711->regmap, AS3711_ASIC_ID_2, &id2); |
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if (ret < 0) { |
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dev_err(&client->dev, "regmap_read() failed: %d\n", ret); |
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return ret; |
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} |
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if (id1 != 0x8b) |
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return -ENODEV; |
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dev_info(as3711->dev, "AS3711 detected: %x:%x\n", id1, id2); |
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/* |
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* We can reuse as3711_subdevs[], |
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* it will be copied in mfd_add_devices() |
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*/ |
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if (pdata) { |
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as3711_subdevs[AS3711_REGULATOR].platform_data = |
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&pdata->regulator; |
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as3711_subdevs[AS3711_REGULATOR].pdata_size = |
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sizeof(pdata->regulator); |
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as3711_subdevs[AS3711_BACKLIGHT].platform_data = |
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&pdata->backlight; |
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as3711_subdevs[AS3711_BACKLIGHT].pdata_size = |
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sizeof(pdata->backlight); |
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} else { |
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as3711_subdevs[AS3711_REGULATOR].platform_data = NULL; |
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as3711_subdevs[AS3711_REGULATOR].pdata_size = 0; |
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as3711_subdevs[AS3711_BACKLIGHT].platform_data = NULL; |
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as3711_subdevs[AS3711_BACKLIGHT].pdata_size = 0; |
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} |
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ret = devm_mfd_add_devices(as3711->dev, -1, as3711_subdevs, |
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ARRAY_SIZE(as3711_subdevs), NULL, 0, NULL); |
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if (ret < 0) |
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dev_err(&client->dev, "add mfd devices failed: %d\n", ret); |
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return ret; |
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} |
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static const struct i2c_device_id as3711_i2c_id[] = { |
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{.name = "as3711", .driver_data = 0}, |
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{} |
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}; |
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static struct i2c_driver as3711_i2c_driver = { |
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.driver = { |
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.name = "as3711", |
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.of_match_table = of_match_ptr(as3711_of_match), |
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}, |
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.probe = as3711_i2c_probe, |
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.id_table = as3711_i2c_id, |
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}; |
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static int __init as3711_i2c_init(void) |
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{ |
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return i2c_add_driver(&as3711_i2c_driver); |
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} |
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/* Initialise early */ |
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subsys_initcall(as3711_i2c_init);
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