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Date: Tue, 12 Nov 2013 13:52:59 -0800
From: David Brown <davidb@...eaurora.org>
To: Linus Walleij <linus.walleij@...aro.org>
Cc: Viktar Palstsiuk <viktar.palstsiuk@...mwad.com>,
Gregory Bean <gbean@...eaurora.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] gpio: Add support for SX151x SPI GPIO Expanders
On Tue, Nov 12, 2013 at 08:32:20PM +0100, Linus Walleij wrote:
>Gregory,
>
>this is your driver, can you take a look at this patch?
I don't think Gregory has this email address any more, and I don't
know another address for him.
David
>Yours,
>Linus Walleij
>
>
>On Thu, Oct 24, 2013 at 11:51 AM, Viktar Palstsiuk
><viktar.palstsiuk@...mwad.com> wrote:
>
>> Isolated i2c specific parts and
>> added spi bindings for the sx151x devices.
>>
>> Signed-off-by: Viktar Palstsiuk <viktar.palstsiuk@...mwad.com>
>> ---
>> drivers/gpio/Kconfig | 10 +-
>> drivers/gpio/gpio-sx150x.c | 267 +++++++++++++++++++++++++++++++++++++++------
>> 2 files changed, 239 insertions(+), 38 deletions(-)
>>
>> diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
>> index b6ed304..4d296ab 100644
>> --- a/drivers/gpio/Kconfig
>> +++ b/drivers/gpio/Kconfig
>> @@ -465,15 +465,15 @@ config GPIO_RC5T583
>> of RC5T583 device through standard gpio library.
>>
>> config GPIO_SX150X
>> - bool "Semtech SX150x I2C GPIO expander"
>> - depends on I2C=y
>> + bool "Semtech SX15xx I2C/SPI GPIO expander"
>> + depends on SPI_MASTER || I2C
>> default n
>> help
>> - Say yes here to provide support for Semtech SX150-series I2C
>> + Say yes here to provide support for Semtech SX15xx-series I2C/SPI
>> GPIO expanders. Compatible models include:
>>
>> - 8 bits: sx1508q
>> - 16 bits: sx1509q
>> + 8 bits: sx1508q, sx1511
>> + 16 bits: sx1509q, sx1512
>>
>> config GPIO_STMPE
>> bool "STMPE GPIOs"
>> diff --git a/drivers/gpio/gpio-sx150x.c b/drivers/gpio/gpio-sx150x.c
>> index d2983e9..bee1661 100644
>> --- a/drivers/gpio/gpio-sx150x.c
>> +++ b/drivers/gpio/gpio-sx150x.c
>> @@ -22,9 +22,16 @@
>> #include <linux/module.h>
>> #include <linux/mutex.h>
>> #include <linux/slab.h>
>> +#include <linux/spi/spi.h>
>> #include <linux/workqueue.h>
>> #include <linux/i2c/sx150x.h>
>>
>> +/**
>> + * SX15xx types supported by driver
>> + */
>> +#define SX15_TYPE_8_GPIOS 0
>> +#define SX15_TYPE_16_GPIOS 1
>> +
>> #define NO_UPDATE_PENDING -1
>>
>> struct sx150x_device_data {
>> @@ -43,9 +50,17 @@ struct sx150x_device_data {
>> u8 ngpios;
>> };
>>
>> +struct sx150x_chip;
>> +
>> +struct sx15xx_ops {
>> + s32 (*read)(struct device *dev, u8 reg, u8 *val);
>> + s32 (*write)(struct device *dev, u8 reg, u8 val);
>> +};
>> +
>> struct sx150x_chip {
>> struct gpio_chip gpio_chip;
>> - struct i2c_client *client;
>> + struct device *dev;
>> + const struct sx15xx_ops *ops;
>> const struct sx150x_device_data *dev_cfg;
>> int irq_summary;
>> int irq_base;
>> @@ -59,7 +74,7 @@ struct sx150x_chip {
>> };
>>
>> static const struct sx150x_device_data sx150x_devices[] = {
>> - [0] = { /* sx1508q */
>> + [SX15_TYPE_8_GPIOS] = { /* sx1508q */
>> .reg_pullup = 0x03,
>> .reg_pulldn = 0x04,
>> .reg_drain = 0x05,
>> @@ -74,7 +89,7 @@ static const struct sx150x_device_data sx150x_devices[] = {
>> .reg_reset = 0x7d,
>> .ngpios = 8
>> },
>> - [1] = { /* sx1509q */
>> + [SX15_TYPE_16_GPIOS] = { /* sx1509q */
>> .reg_pullup = 0x07,
>> .reg_pulldn = 0x09,
>> .reg_drain = 0x0b,
>> @@ -91,37 +106,86 @@ static const struct sx150x_device_data sx150x_devices[] = {
>> },
>> };
>>
>> -static const struct i2c_device_id sx150x_id[] = {
>> - {"sx1508q", 0},
>> - {"sx1509q", 1},
>> - {}
>> -};
>> -MODULE_DEVICE_TABLE(i2c, sx150x_id);
>> +#ifdef CONFIG_I2C
>>
>> -static s32 sx150x_i2c_write(struct i2c_client *client, u8 reg, u8 val)
>> +static s32 sx150x_i2c_write(struct device *dev, u8 reg, u8 val)
>> {
>> + struct i2c_client *client = to_i2c_client(dev);
>> s32 err = i2c_smbus_write_byte_data(client, reg, val);
>>
>> if (err < 0)
>> - dev_warn(&client->dev,
>> + dev_warn(dev,
>> "i2c write fail: can't write %02x to %02x: %d\n",
>> val, reg, err);
>> return err;
>> }
>>
>> -static s32 sx150x_i2c_read(struct i2c_client *client, u8 reg, u8 *val)
>> +static s32 sx150x_i2c_read(struct device *dev, u8 reg, u8 *val)
>> {
>> + struct i2c_client *client = to_i2c_client(dev);
>> s32 err = i2c_smbus_read_byte_data(client, reg);
>>
>> if (err >= 0)
>> *val = err;
>> else
>> - dev_warn(&client->dev,
>> + dev_warn(dev,
>> "i2c read fail: can't read from %02x: %d\n",
>> reg, err);
>> return err;
>> }
>>
>> +static const struct sx15xx_ops sx150x_ops = {
>> + .read = sx150x_i2c_read,
>> + .write = sx150x_i2c_write,
>> +};
>> +
>> +#endif /* CONFIG_I2C */
>> +
>> +#ifdef CONFIG_SPI_MASTER
>> +
>> +static s32 sx151x_spi_write(struct device *dev, u8 reg, u8 val)
>> +{
>> + struct spi_device *spi = to_spi_device(dev);
>> + u8 tx[2];
>> + s32 err;
>> +
>> + tx[0] = reg;
>> + tx[1] = val;
>> +
>> + err = spi_write(spi, tx, sizeof tx);
>> +
>> + if (err < 0)
>> + dev_warn(dev,
>> + "spi write fail: can't write %02x to %02x: %d\n",
>> + val, reg, err);
>> + return err;
>> +}
>> +
>> +static s32 sx151x_spi_read(struct device *dev, u8 reg, u8 *val)
>> +{
>> + struct spi_device *spi = to_spi_device(dev);
>> + u8 tx[1], rx[1];
>> + s32 err;
>> +
>> + tx[0] = reg | 0x80;
>> + err = spi_write_then_read(spi, tx, sizeof tx, rx, sizeof rx);
>> +
>> + if (err >= 0)
>> + *val = rx[0];
>> + else
>> + dev_warn(dev,
>> + "spi read fail: can't read from %02x: %d\n",
>> + reg, err);
>> + return err;
>> +}
>> +
>> +static const struct sx15xx_ops sx151x_ops = {
>> + .read = sx151x_spi_read,
>> + .write = sx151x_spi_write,
>> +};
>> +
>> +#endif /* CONFIG_SPI_MASTER */
>> +
>> static inline bool offset_is_oscio(struct sx150x_chip *chip, unsigned offset)
>> {
>> return (chip->dev_cfg->ngpios == offset);
>> @@ -164,13 +228,12 @@ static s32 sx150x_write_cfg(struct sx150x_chip *chip,
>> s32 err;
>>
>> sx150x_find_cfg(offset, width, ®, &mask, &shift);
>> - err = sx150x_i2c_read(chip->client, reg, &data);
>> + err = chip->ops->read(chip->dev, reg, &data);
>> if (err < 0)
>> return err;
>> -
>> data &= ~mask;
>> data |= (val << shift) & mask;
>> - return sx150x_i2c_write(chip->client, reg, data);
>> + return chip->ops->write(chip->dev, reg, data);
>> }
>>
>> static int sx150x_get_io(struct sx150x_chip *chip, unsigned offset)
>> @@ -182,7 +245,7 @@ static int sx150x_get_io(struct sx150x_chip *chip, unsigned offset)
>> s32 err;
>>
>> sx150x_find_cfg(offset, 1, ®, &mask, &shift);
>> - err = sx150x_i2c_read(chip->client, reg, &data);
>> + err = chip->ops->read(chip->dev, reg, &data);
>> if (err >= 0)
>> err = (data & mask) != 0 ? 1 : 0;
>>
>> @@ -191,7 +254,7 @@ static int sx150x_get_io(struct sx150x_chip *chip, unsigned offset)
>>
>> static void sx150x_set_oscio(struct sx150x_chip *chip, int val)
>> {
>> - sx150x_i2c_write(chip->client,
>> + chip->ops->write(chip->dev,
>> chip->dev_cfg->reg_clock,
>> (val ? 0x1f : 0x10));
>> }
>> @@ -361,13 +424,13 @@ static irqreturn_t sx150x_irq_thread_fn(int irq, void *dev_id)
>> int i;
>>
>> for (i = (chip->dev_cfg->ngpios / 8) - 1; i >= 0; --i) {
>> - err = sx150x_i2c_read(chip->client,
>> + err = chip->ops->read(chip->dev,
>> chip->dev_cfg->reg_irq_src - i,
>> &val);
>> if (err < 0)
>> continue;
>>
>> - sx150x_i2c_write(chip->client,
>> + chip->ops->write(chip->dev,
>> chip->dev_cfg->reg_irq_src - i,
>> val);
>> for (n = 0; n < 8; ++n) {
>> @@ -421,15 +484,17 @@ out:
>> }
>>
>> static void sx150x_init_chip(struct sx150x_chip *chip,
>> - struct i2c_client *client,
>> + struct device *dev,
>> + const struct sx15xx_ops *ops,
>> kernel_ulong_t driver_data,
>> struct sx150x_platform_data *pdata)
>> {
>> mutex_init(&chip->lock);
>>
>> - chip->client = client;
>> + chip->dev = dev;
>> + chip->ops = ops;
>> chip->dev_cfg = &sx150x_devices[driver_data];
>> - chip->gpio_chip.label = client->name;
>> + chip->gpio_chip.label = dev_name(dev);
>> chip->gpio_chip.direction_input = sx150x_gpio_direction_input;
>> chip->gpio_chip.direction_output = sx150x_gpio_direction_output;
>> chip->gpio_chip.get = sx150x_gpio_get;
>> @@ -441,7 +506,7 @@ static void sx150x_init_chip(struct sx150x_chip *chip,
>> if (pdata->oscio_is_gpo)
>> ++chip->gpio_chip.ngpio;
>>
>> - chip->irq_chip.name = client->name;
>> + chip->irq_chip.name = dev_name(dev);
>> chip->irq_chip.irq_mask = sx150x_irq_mask;
>> chip->irq_chip.irq_unmask = sx150x_irq_unmask;
>> chip->irq_chip.irq_set_type = sx150x_irq_set_type;
>> @@ -462,7 +527,7 @@ static int sx150x_init_io(struct sx150x_chip *chip, u8 base, u16 cfg)
>> unsigned n;
>>
>> for (n = 0; err >= 0 && n < (chip->dev_cfg->ngpios / 8); ++n)
>> - err = sx150x_i2c_write(chip->client, base - n, cfg >> (n * 8));
>> + err = chip->ops->write(chip->dev, base - n, cfg >> (n * 8));
>> return err;
>> }
>>
>> @@ -470,13 +535,13 @@ static int sx150x_reset(struct sx150x_chip *chip)
>> {
>> int err;
>>
>> - err = i2c_smbus_write_byte_data(chip->client,
>> + err = chip->ops->write(chip->dev,
>> chip->dev_cfg->reg_reset,
>> 0x12);
>> if (err < 0)
>> return err;
>>
>> - err = i2c_smbus_write_byte_data(chip->client,
>> + err = chip->ops->write(chip->dev,
>> chip->dev_cfg->reg_reset,
>> 0x34);
>> return err;
>> @@ -493,7 +558,7 @@ static int sx150x_init_hw(struct sx150x_chip *chip,
>> return err;
>> }
>>
>> - err = sx150x_i2c_write(chip->client,
>> + err = chip->ops->write(chip->dev,
>> chip->dev_cfg->reg_misc,
>> 0x01);
>> if (err < 0)
>> @@ -548,7 +613,7 @@ static int sx150x_install_irq_chip(struct sx150x_chip *chip,
>> #endif
>> }
>>
>> - err = devm_request_threaded_irq(&chip->client->dev,
>> + err = devm_request_threaded_irq(chip->dev,
>> irq_summary,
>> NULL,
>> sx150x_irq_thread_fn,
>> @@ -574,6 +639,8 @@ static void sx150x_remove_irq_chip(struct sx150x_chip *chip)
>> }
>> }
>>
>> +#ifdef CONFIG_I2C
>> +
>> static int sx150x_probe(struct i2c_client *client,
>> const struct i2c_device_id *id)
>> {
>> @@ -595,7 +662,7 @@ static int sx150x_probe(struct i2c_client *client,
>> if (!chip)
>> return -ENOMEM;
>>
>> - sx150x_init_chip(chip, client, id->driver_data, pdata);
>> + sx150x_init_chip(chip, &client->dev, &sx150x_ops, id->driver_data, pdata);
>> rc = sx150x_init_hw(chip, pdata);
>> if (rc < 0)
>> return rc;
>> @@ -636,6 +703,13 @@ static int sx150x_remove(struct i2c_client *client)
>> return 0;
>> }
>>
>> +static const struct i2c_device_id sx150x_id[] = {
>> + {"sx1508q", SX15_TYPE_8_GPIOS},
>> + {"sx1509q", SX15_TYPE_16_GPIOS},
>> + {}
>> +};
>> +MODULE_DEVICE_TABLE(i2c, sx150x_id);
>> +
>> static struct i2c_driver sx150x_driver = {
>> .driver = {
>> .name = "sx150x",
>> @@ -646,19 +720,146 @@ static struct i2c_driver sx150x_driver = {
>> .id_table = sx150x_id,
>> };
>>
>> -static int __init sx150x_init(void)
>> +static int __init sx150x_i2c_init(void)
>> {
>> return i2c_add_driver(&sx150x_driver);
>> }
>> +
>> +static void __exit sx150x_i2c_exit(void)
>> +{
>> + return i2c_del_driver(&sx150x_driver);
>> +}
>> +
>> +#else
>> +
>> +static int __init sx150x_i2c_init(void) { return 0; }
>> +static void sx150x_i2c_exit(void) { }
>> +
>> +#endif /* CONFIG_I2C */
>> +
>> +#ifdef CONFIG_SPI_MASTER
>> +
>> +static int sx151x_probe(struct spi_device *spi)
>> +{
>> + struct sx150x_platform_data *pdata;
>> + struct sx150x_chip *chip;
>> + int rc;
>> +
>> + pdata = dev_get_platdata(&spi->dev);
>> + if (!pdata) {
>> + return -EINVAL;
>> + }
>> +
>> + chip = devm_kzalloc(&spi->dev,
>> + sizeof(struct sx150x_chip), GFP_KERNEL);
>> + if (!chip)
>> + return -ENOMEM;
>> +
>> + sx150x_init_chip(chip, &spi->dev, &sx151x_ops,
>> + spi_get_device_id(spi)->driver_data, pdata);
>> + rc = sx150x_init_hw(chip, pdata);
>> + if (rc < 0)
>> + return rc;
>> +
>> + rc = gpiochip_add(&chip->gpio_chip);
>> + if (rc < 0)
>> + return rc;
>> +
>> + if (pdata->irq_summary >= 0) {
>> + rc = sx150x_install_irq_chip(chip,
>> + pdata->irq_summary,
>> + pdata->irq_base);
>> + if (rc < 0)
>> + goto probe_fail_post_gpiochip_add;
>> + }
>> +
>> + spi_set_drvdata(spi, chip);
>> +
>> + return 0;
>> +probe_fail_post_gpiochip_add:
>> + WARN_ON(gpiochip_remove(&chip->gpio_chip) < 0);
>> + return rc;
>> +}
>> +
>> +static int sx151x_remove(struct spi_device *spi)
>> +{
>> + struct sx150x_chip *chip;
>> + int rc;
>> +
>> + chip = spi_get_drvdata(spi);
>> + rc = gpiochip_remove(&chip->gpio_chip);
>> + if (rc < 0)
>> + return rc;
>> +
>> + if (chip->irq_summary >= 0)
>> + sx150x_remove_irq_chip(chip);
>> +
>> + return 0;
>> +}
>> +
>> +static const struct spi_device_id sx151x_ids[] = {
>> + { "sx1511", SX15_TYPE_8_GPIOS },
>> + { "sx1512", SX15_TYPE_16_GPIOS },
>> + { },
>> +};
>> +MODULE_DEVICE_TABLE(spi, sx151x_ids);
>> +
>> +static struct spi_driver sx151x_driver = {
>> + .probe = sx151x_probe,
>> + .remove = sx151x_remove,
>> + .id_table = sx151x_ids,
>> + .driver = {
>> + .name = "sx151x",
>> + .owner = THIS_MODULE,
>> + },
>> +};
>> +
>> +static int __init sx151x_spi_init(void)
>> +{
>> + return spi_register_driver(&sx151x_driver);
>> +}
>> +
>> +static void sx151x_spi_exit(void)
>> +{
>> + spi_unregister_driver(&sx151x_driver);
>> +}
>> +
>> +#else
>> +
>> +static int __init sx151x_spi_init(void) { return 0; }
>> +static void sx151x_spi_exit(void) { }
>> +
>> +#endif /* CONFIG_SPI_MASTER */
>> +
>> +static int __init sx150x_init(void)
>> +{
>> + int ret;
>> +
>> + ret = sx151x_spi_init();
>> + if (ret)
>> + goto spi_fail;
>> +
>> + ret = sx150x_i2c_init();
>> + if (ret)
>> + goto i2c_fail;
>> +
>> + return 0;
>> +
>> + i2c_fail:
>> + sx151x_spi_exit();
>> + spi_fail:
>> + return ret;
>> +}
>> subsys_initcall(sx150x_init);
>>
>> static void __exit sx150x_exit(void)
>> {
>> - return i2c_del_driver(&sx150x_driver);
>> + sx151x_spi_exit();
>> + sx150x_i2c_exit();
>> }
>> module_exit(sx150x_exit);
>>
>> MODULE_AUTHOR("Gregory Bean <gbean@...eaurora.org>");
>> -MODULE_DESCRIPTION("Driver for Semtech SX150X I2C GPIO Expanders");
>> +MODULE_DESCRIPTION("Driver for Semtech SX15xx I2C/SPI GPIO Expanders");
>> MODULE_LICENSE("GPL v2");
>> MODULE_ALIAS("i2c:sx150x");
>> --
>> 1.8.4.rc3
>>
--
sent by an employee of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
hosted by The Linux Foundation
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