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Date: Tue, 13 Oct 2015 10:25:52 +0100
From: Lee Jones <lee.jones@...aro.org>
To: Adam Thomson <Adam.Thomson.Opensource@...semi.com>
Cc: Samuel Ortiz <sameo@...ux.intel.com>,
Sebastian Reichel <sre@...nel.org>,
Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
David Woodhouse <dwmw2@...radead.org>,
Rob Herring <robh+dt@...nel.org>,
Pawel Moll <pawel.moll@....com>,
Mark Rutland <mark.rutland@....com>,
Ian Campbell <ijc+devicetree@...lion.org.uk>,
Kumar Gala <galak@...eaurora.org>, linux-pm@...r.kernel.org,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
Support Opensource <support.opensource@...semi.com>
Subject: Re: [PATCH v7 1/6] mfd: da9150: Add support for Fuel-Gauge
On Wed, 07 Oct 2015, Adam Thomson wrote:
> Signed-off-by: Adam Thomson <Adam.Thomson.Opensource@...semi.com>
> Acked-by: Lee Jones <lee.jones@...aro.org>
> ---
>
> Changes in v6:
> - Rebase to v4.3-rc4
>
> Changes in v5:
> - Rebase to v4.2
>
> Changes in v4:
> - Update compatible string of fuel-gauge to "dlg, da9150-fuel-gauge". Also
> made similar change to driver name to keep things consistent.
>
> Changes in v3:
> - Use DEFINE_RES_IRQ_NAMED() helper for defining FG IRQ resource.
> - Unwanted new line & comments removed.
> - Remove gotos which can be replaced with straight forward return calls.
> - Add enum for indexing MFD cells list, which is used to assign pdata for FG
> sub-device.
> - Remove use of function pointers for QIF related read/write functions as
> currently only I2C supported, so call I2C functions directly.
> - Fold fg.h contents into core.h.
>
> Changes in v2:
> - Moved temp callback function prototype to be part of power fuel-gauge patch,
> as requested by Lee Jones.
>
> drivers/mfd/da9150-core.c | 156 ++++++++++++++++++++++++++++++++++++++--
> include/linux/mfd/da9150/core.h | 19 ++++-
> 2 files changed, 167 insertions(+), 8 deletions(-)
Applied, thanks.
> diff --git a/drivers/mfd/da9150-core.c b/drivers/mfd/da9150-core.c
> index 94b9bbd..85ca4b5 100644
> --- a/drivers/mfd/da9150-core.c
> +++ b/drivers/mfd/da9150-core.c
> @@ -23,6 +23,77 @@
> #include <linux/mfd/da9150/core.h>
> #include <linux/mfd/da9150/registers.h>
>
> +/* Raw device access, used for QIF */
> +static int da9150_i2c_read_device(struct i2c_client *client, u8 addr, int count,
> + u8 *buf)
> +{
> + struct i2c_msg xfer;
> + int ret;
> +
> + /*
> + * Read is split into two transfers as device expects STOP/START rather
> + * than repeated start to carry out this kind of access.
> + */
> +
> + /* Write address */
> + xfer.addr = client->addr;
> + xfer.flags = 0;
> + xfer.len = 1;
> + xfer.buf = &addr;
> +
> + ret = i2c_transfer(client->adapter, &xfer, 1);
> + if (ret != 1) {
> + if (ret < 0)
> + return ret;
> + else
> + return -EIO;
> + }
> +
> + /* Read data */
> + xfer.addr = client->addr;
> + xfer.flags = I2C_M_RD;
> + xfer.len = count;
> + xfer.buf = buf;
> +
> + ret = i2c_transfer(client->adapter, &xfer, 1);
> + if (ret == 1)
> + return 0;
> + else if (ret < 0)
> + return ret;
> + else
> + return -EIO;
> +}
> +
> +static int da9150_i2c_write_device(struct i2c_client *client, u8 addr,
> + int count, const u8 *buf)
> +{
> + struct i2c_msg xfer;
> + u8 *reg_data;
> + int ret;
> +
> + reg_data = kzalloc(1 + count, GFP_KERNEL);
> + if (!reg_data)
> + return -ENOMEM;
> +
> + reg_data[0] = addr;
> + memcpy(®_data[1], buf, count);
> +
> + /* Write address & data */
> + xfer.addr = client->addr;
> + xfer.flags = 0;
> + xfer.len = 1 + count;
> + xfer.buf = reg_data;
> +
> + ret = i2c_transfer(client->adapter, &xfer, 1);
> + kfree(reg_data);
> + if (ret == 1)
> + return 0;
> + else if (ret < 0)
> + return ret;
> + else
> + return -EIO;
> +}
> +
> static bool da9150_volatile_reg(struct device *dev, unsigned int reg)
> {
> switch (reg) {
> @@ -107,6 +178,28 @@ static const struct regmap_config da9150_regmap_config = {
> .volatile_reg = da9150_volatile_reg,
> };
>
> +void da9150_read_qif(struct da9150 *da9150, u8 addr, int count, u8 *buf)
> +{
> + int ret;
> +
> + ret = da9150_i2c_read_device(da9150->core_qif, addr, count, buf);
> + if (ret < 0)
> + dev_err(da9150->dev, "Failed to read from QIF 0x%x: %d\n",
> + addr, ret);
> +}
> +EXPORT_SYMBOL_GPL(da9150_read_qif);
> +
> +void da9150_write_qif(struct da9150 *da9150, u8 addr, int count, const u8 *buf)
> +{
> + int ret;
> +
> + ret = da9150_i2c_write_device(da9150->core_qif, addr, count, buf);
> + if (ret < 0)
> + dev_err(da9150->dev, "Failed to write to QIF 0x%x: %d\n",
> + addr, ret);
> +}
> +EXPORT_SYMBOL_GPL(da9150_write_qif);
> +
> u8 da9150_reg_read(struct da9150 *da9150, u16 reg)
> {
> int val, ret;
> @@ -297,19 +390,35 @@ static struct resource da9150_charger_resources[] = {
> },
> };
>
> +static struct resource da9150_fg_resources[] = {
> + DEFINE_RES_IRQ_NAMED(DA9150_IRQ_FG, "FG"),
> +};
> +
> +enum da9150_dev_idx {
> + DA9150_GPADC_IDX = 0,
> + DA9150_CHARGER_IDX,
> + DA9150_FG_IDX,
> +};
> +
> static struct mfd_cell da9150_devs[] = {
> - {
> + [DA9150_GPADC_IDX] = {
> .name = "da9150-gpadc",
> .of_compatible = "dlg,da9150-gpadc",
> .resources = da9150_gpadc_resources,
> .num_resources = ARRAY_SIZE(da9150_gpadc_resources),
> },
> - {
> + [DA9150_CHARGER_IDX] = {
> .name = "da9150-charger",
> .of_compatible = "dlg,da9150-charger",
> .resources = da9150_charger_resources,
> .num_resources = ARRAY_SIZE(da9150_charger_resources),
> },
> + [DA9150_FG_IDX] = {
> + .name = "da9150-fuel-gauge",
> + .of_compatible = "dlg,da9150-fuel-gauge",
> + .resources = da9150_fg_resources,
> + .num_resources = ARRAY_SIZE(da9150_fg_resources),
> + },
> };
>
> static int da9150_probe(struct i2c_client *client,
> @@ -317,6 +426,7 @@ static int da9150_probe(struct i2c_client *client,
> {
> struct da9150 *da9150;
> struct da9150_pdata *pdata = dev_get_platdata(&client->dev);
> + int qif_addr;
> int ret;
>
> da9150 = devm_kzalloc(&client->dev, sizeof(*da9150), GFP_KERNEL);
> @@ -335,16 +445,41 @@ static int da9150_probe(struct i2c_client *client,
> return ret;
> }
>
> - da9150->irq_base = pdata ? pdata->irq_base : -1;
> + /* Setup secondary I2C interface for QIF access */
> + qif_addr = da9150_reg_read(da9150, DA9150_CORE2WIRE_CTRL_A);
> + qif_addr = (qif_addr & DA9150_CORE_BASE_ADDR_MASK) >> 1;
> + qif_addr |= DA9150_QIF_I2C_ADDR_LSB;
> + da9150->core_qif = i2c_new_dummy(client->adapter, qif_addr);
> + if (!da9150->core_qif) {
> + dev_err(da9150->dev, "Failed to attach QIF client\n");
> + return -ENODEV;
> + }
> +
> + i2c_set_clientdata(da9150->core_qif, da9150);
> +
> + if (pdata) {
> + da9150->irq_base = pdata->irq_base;
> +
> + da9150_devs[DA9150_FG_IDX].platform_data = pdata->fg_pdata;
> + da9150_devs[DA9150_FG_IDX].pdata_size =
> + sizeof(struct da9150_fg_pdata);
> + } else {
> + da9150->irq_base = -1;
> + }
>
> ret = regmap_add_irq_chip(da9150->regmap, da9150->irq,
> IRQF_TRIGGER_LOW | IRQF_ONESHOT,
> da9150->irq_base, &da9150_regmap_irq_chip,
> &da9150->regmap_irq_data);
> - if (ret)
> - return ret;
> + if (ret) {
> + dev_err(da9150->dev, "Failed to add regmap irq chip: %d\n",
> + ret);
> + goto regmap_irq_fail;
> + }
> +
>
> da9150->irq_base = regmap_irq_chip_get_base(da9150->regmap_irq_data);
> +
> enable_irq_wake(da9150->irq);
>
> ret = mfd_add_devices(da9150->dev, -1, da9150_devs,
> @@ -352,11 +487,17 @@ static int da9150_probe(struct i2c_client *client,
> da9150->irq_base, NULL);
> if (ret) {
> dev_err(da9150->dev, "Failed to add child devices: %d\n", ret);
> - regmap_del_irq_chip(da9150->irq, da9150->regmap_irq_data);
> - return ret;
> + goto mfd_fail;
> }
>
> return 0;
> +
> +mfd_fail:
> + regmap_del_irq_chip(da9150->irq, da9150->regmap_irq_data);
> +regmap_irq_fail:
> + i2c_unregister_device(da9150->core_qif);
> +
> + return ret;
> }
>
> static int da9150_remove(struct i2c_client *client)
> @@ -365,6 +506,7 @@ static int da9150_remove(struct i2c_client *client)
>
> regmap_del_irq_chip(da9150->irq, da9150->regmap_irq_data);
> mfd_remove_devices(da9150->dev);
> + i2c_unregister_device(da9150->core_qif);
>
> return 0;
> }
> diff --git a/include/linux/mfd/da9150/core.h b/include/linux/mfd/da9150/core.h
> index 76e6689..1bf50ca 100644
> --- a/include/linux/mfd/da9150/core.h
> +++ b/include/linux/mfd/da9150/core.h
> @@ -15,6 +15,7 @@
> #define __DA9150_CORE_H
>
> #include <linux/device.h>
> +#include <linux/i2c.h>
> #include <linux/interrupt.h>
> #include <linux/regmap.h>
>
> @@ -46,23 +47,39 @@
> #define DA9150_IRQ_GPADC 19
> #define DA9150_IRQ_WKUP 20
>
> +/* I2C sub-device address */
> +#define DA9150_QIF_I2C_ADDR_LSB 0x5
> +
> +struct da9150_fg_pdata {
> + u32 update_interval; /* msecs */
> + u8 warn_soc_lvl; /* % value */
> + u8 crit_soc_lvl; /* % value */
> +};
> +
> struct da9150_pdata {
> int irq_base;
> + struct da9150_fg_pdata *fg_pdata;
> };
>
> struct da9150 {
> struct device *dev;
> struct regmap *regmap;
> + struct i2c_client *core_qif;
> +
> struct regmap_irq_chip_data *regmap_irq_data;
> int irq;
> int irq_base;
> };
>
> -/* Device I/O */
> +/* Device I/O - Query Interface for FG and standard register access */
> +void da9150_read_qif(struct da9150 *da9150, u8 addr, int count, u8 *buf);
> +void da9150_write_qif(struct da9150 *da9150, u8 addr, int count, const u8 *buf);
> +
> u8 da9150_reg_read(struct da9150 *da9150, u16 reg);
> void da9150_reg_write(struct da9150 *da9150, u16 reg, u8 val);
> void da9150_set_bits(struct da9150 *da9150, u16 reg, u8 mask, u8 val);
>
> void da9150_bulk_read(struct da9150 *da9150, u16 reg, int count, u8 *buf);
> void da9150_bulk_write(struct da9150 *da9150, u16 reg, int count, const u8 *buf);
> +
> #endif /* __DA9150_CORE_H */
--
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog
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