238 lines
6.1 KiB
C
238 lines
6.1 KiB
C
/*
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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, <g.liakhovetski@gmx.de>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the version 2 of the GNU General Public License as
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* published by the Free Software Foundation
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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/module.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_REGS,
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.num_reg_defaults_raw = AS3711_MAX_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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MODULE_DEVICE_TABLE(of, as3711_of_match);
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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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dev_err(&client->dev, "Failed to allocate pdata\n");
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return -ENOMEM;
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}
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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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dev_err(&client->dev, "Memory allocation failed\n");
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return -ENOMEM;
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}
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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, "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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/* We can reuse as3711_subdevs[], it will be copied in mfd_add_devices() */
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if (pdata) {
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as3711_subdevs[AS3711_REGULATOR].platform_data = &pdata->regulator;
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as3711_subdevs[AS3711_REGULATOR].pdata_size = sizeof(pdata->regulator);
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as3711_subdevs[AS3711_BACKLIGHT].platform_data = &pdata->backlight;
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as3711_subdevs[AS3711_BACKLIGHT].pdata_size = 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 = 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 int as3711_i2c_remove(struct i2c_client *client)
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{
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struct as3711 *as3711 = i2c_get_clientdata(client);
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mfd_remove_devices(as3711->dev);
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return 0;
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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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MODULE_DEVICE_TABLE(i2c, as3711_i2c_id);
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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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.owner = THIS_MODULE,
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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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.remove = as3711_i2c_remove,
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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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static void __exit as3711_i2c_exit(void)
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{
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i2c_del_driver(&as3711_i2c_driver);
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}
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module_exit(as3711_i2c_exit);
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MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
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MODULE_DESCRIPTION("AS3711 PMIC driver");
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MODULE_LICENSE("GPL v2");
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