mfd: da9150: Add support for Fuel-Gauge
Signed-off-by: Adam Thomson <Adam.Thomson.Opensource@diasemi.com> Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Adam Thomson
Lee Jones
parent
1f93e4a96c
commit
1ac710e08a
2 changed files with 167 additions and 8 deletions
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@ -23,6 +23,77 @@
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#include <linux/mfd/da9150/core.h>
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#include <linux/mfd/da9150/registers.h>
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/* Raw device access, used for QIF */
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static int da9150_i2c_read_device(struct i2c_client *client, u8 addr, int count,
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u8 *buf)
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{
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struct i2c_msg xfer;
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int ret;
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/*
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* Read is split into two transfers as device expects STOP/START rather
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* than repeated start to carry out this kind of access.
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*/
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/* Write address */
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xfer.addr = client->addr;
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xfer.flags = 0;
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xfer.len = 1;
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xfer.buf = &addr;
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ret = i2c_transfer(client->adapter, &xfer, 1);
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if (ret != 1) {
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if (ret < 0)
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return ret;
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else
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return -EIO;
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}
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/* Read data */
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xfer.addr = client->addr;
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xfer.flags = I2C_M_RD;
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xfer.len = count;
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xfer.buf = buf;
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ret = i2c_transfer(client->adapter, &xfer, 1);
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if (ret == 1)
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return 0;
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else if (ret < 0)
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return ret;
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else
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return -EIO;
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}
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static int da9150_i2c_write_device(struct i2c_client *client, u8 addr,
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int count, const u8 *buf)
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{
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struct i2c_msg xfer;
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u8 *reg_data;
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int ret;
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reg_data = kzalloc(1 + count, GFP_KERNEL);
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if (!reg_data)
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return -ENOMEM;
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reg_data[0] = addr;
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memcpy(®_data[1], buf, count);
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/* Write address & data */
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xfer.addr = client->addr;
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xfer.flags = 0;
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xfer.len = 1 + count;
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xfer.buf = reg_data;
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ret = i2c_transfer(client->adapter, &xfer, 1);
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kfree(reg_data);
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if (ret == 1)
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return 0;
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else if (ret < 0)
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return ret;
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else
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return -EIO;
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}
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static bool da9150_volatile_reg(struct device *dev, unsigned int reg)
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{
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switch (reg) {
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@ -107,6 +178,28 @@ static const struct regmap_config da9150_regmap_config = {
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.volatile_reg = da9150_volatile_reg,
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};
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void da9150_read_qif(struct da9150 *da9150, u8 addr, int count, u8 *buf)
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{
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int ret;
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ret = da9150_i2c_read_device(da9150->core_qif, addr, count, buf);
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if (ret < 0)
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dev_err(da9150->dev, "Failed to read from QIF 0x%x: %d\n",
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addr, ret);
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}
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EXPORT_SYMBOL_GPL(da9150_read_qif);
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void da9150_write_qif(struct da9150 *da9150, u8 addr, int count, const u8 *buf)
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{
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int ret;
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ret = da9150_i2c_write_device(da9150->core_qif, addr, count, buf);
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if (ret < 0)
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dev_err(da9150->dev, "Failed to write to QIF 0x%x: %d\n",
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addr, ret);
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}
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EXPORT_SYMBOL_GPL(da9150_write_qif);
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u8 da9150_reg_read(struct da9150 *da9150, u16 reg)
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{
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int val, ret;
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@ -297,19 +390,35 @@ static struct resource da9150_charger_resources[] = {
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},
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};
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static struct resource da9150_fg_resources[] = {
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DEFINE_RES_IRQ_NAMED(DA9150_IRQ_FG, "FG"),
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};
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enum da9150_dev_idx {
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DA9150_GPADC_IDX = 0,
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DA9150_CHARGER_IDX,
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DA9150_FG_IDX,
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};
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static struct mfd_cell da9150_devs[] = {
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{
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[DA9150_GPADC_IDX] = {
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.name = "da9150-gpadc",
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.of_compatible = "dlg,da9150-gpadc",
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.resources = da9150_gpadc_resources,
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.num_resources = ARRAY_SIZE(da9150_gpadc_resources),
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},
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{
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[DA9150_CHARGER_IDX] = {
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.name = "da9150-charger",
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.of_compatible = "dlg,da9150-charger",
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.resources = da9150_charger_resources,
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.num_resources = ARRAY_SIZE(da9150_charger_resources),
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},
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[DA9150_FG_IDX] = {
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.name = "da9150-fuel-gauge",
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.of_compatible = "dlg,da9150-fuel-gauge",
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.resources = da9150_fg_resources,
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.num_resources = ARRAY_SIZE(da9150_fg_resources),
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},
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};
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static int da9150_probe(struct i2c_client *client,
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@ -317,6 +426,7 @@ static int da9150_probe(struct i2c_client *client,
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{
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struct da9150 *da9150;
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struct da9150_pdata *pdata = dev_get_platdata(&client->dev);
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int qif_addr;
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int ret;
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da9150 = devm_kzalloc(&client->dev, sizeof(*da9150), GFP_KERNEL);
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@ -335,16 +445,41 @@ static int da9150_probe(struct i2c_client *client,
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return ret;
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}
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da9150->irq_base = pdata ? pdata->irq_base : -1;
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/* Setup secondary I2C interface for QIF access */
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qif_addr = da9150_reg_read(da9150, DA9150_CORE2WIRE_CTRL_A);
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qif_addr = (qif_addr & DA9150_CORE_BASE_ADDR_MASK) >> 1;
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qif_addr |= DA9150_QIF_I2C_ADDR_LSB;
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da9150->core_qif = i2c_new_dummy(client->adapter, qif_addr);
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if (!da9150->core_qif) {
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dev_err(da9150->dev, "Failed to attach QIF client\n");
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return -ENODEV;
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}
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i2c_set_clientdata(da9150->core_qif, da9150);
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if (pdata) {
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da9150->irq_base = pdata->irq_base;
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da9150_devs[DA9150_FG_IDX].platform_data = pdata->fg_pdata;
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da9150_devs[DA9150_FG_IDX].pdata_size =
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sizeof(struct da9150_fg_pdata);
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} else {
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da9150->irq_base = -1;
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}
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ret = regmap_add_irq_chip(da9150->regmap, da9150->irq,
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IRQF_TRIGGER_LOW | IRQF_ONESHOT,
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da9150->irq_base, &da9150_regmap_irq_chip,
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&da9150->regmap_irq_data);
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if (ret)
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return ret;
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if (ret) {
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dev_err(da9150->dev, "Failed to add regmap irq chip: %d\n",
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ret);
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goto regmap_irq_fail;
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}
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da9150->irq_base = regmap_irq_chip_get_base(da9150->regmap_irq_data);
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enable_irq_wake(da9150->irq);
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ret = mfd_add_devices(da9150->dev, -1, da9150_devs,
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@ -352,11 +487,17 @@ static int da9150_probe(struct i2c_client *client,
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da9150->irq_base, NULL);
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if (ret) {
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dev_err(da9150->dev, "Failed to add child devices: %d\n", ret);
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regmap_del_irq_chip(da9150->irq, da9150->regmap_irq_data);
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return ret;
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goto mfd_fail;
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}
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return 0;
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mfd_fail:
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regmap_del_irq_chip(da9150->irq, da9150->regmap_irq_data);
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regmap_irq_fail:
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i2c_unregister_device(da9150->core_qif);
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return ret;
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}
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static int da9150_remove(struct i2c_client *client)
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@ -365,6 +506,7 @@ static int da9150_remove(struct i2c_client *client)
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regmap_del_irq_chip(da9150->irq, da9150->regmap_irq_data);
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mfd_remove_devices(da9150->dev);
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i2c_unregister_device(da9150->core_qif);
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return 0;
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}
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@ -15,6 +15,7 @@
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#define __DA9150_CORE_H
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#include <linux/device.h>
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#include <linux/i2c.h>
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#include <linux/interrupt.h>
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#include <linux/regmap.h>
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@ -46,23 +47,39 @@
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#define DA9150_IRQ_GPADC 19
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#define DA9150_IRQ_WKUP 20
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/* I2C sub-device address */
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#define DA9150_QIF_I2C_ADDR_LSB 0x5
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struct da9150_fg_pdata {
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u32 update_interval; /* msecs */
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u8 warn_soc_lvl; /* % value */
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u8 crit_soc_lvl; /* % value */
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};
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struct da9150_pdata {
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int irq_base;
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struct da9150_fg_pdata *fg_pdata;
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};
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struct da9150 {
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struct device *dev;
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struct regmap *regmap;
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struct i2c_client *core_qif;
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struct regmap_irq_chip_data *regmap_irq_data;
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int irq;
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int irq_base;
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};
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/* Device I/O */
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/* Device I/O - Query Interface for FG and standard register access */
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void da9150_read_qif(struct da9150 *da9150, u8 addr, int count, u8 *buf);
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void da9150_write_qif(struct da9150 *da9150, u8 addr, int count, const u8 *buf);
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u8 da9150_reg_read(struct da9150 *da9150, u16 reg);
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void da9150_reg_write(struct da9150 *da9150, u16 reg, u8 val);
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void da9150_set_bits(struct da9150 *da9150, u16 reg, u8 mask, u8 val);
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void da9150_bulk_read(struct da9150 *da9150, u16 reg, int count, u8 *buf);
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void da9150_bulk_write(struct da9150 *da9150, u16 reg, int count, const u8 *buf);
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#endif /* __DA9150_CORE_H */
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