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Date: Thu, 26 May 2011 14:00:15 -0600
From: Grant Likely <grant.likely@...retlab.ca>
To: Haojian Zhuang <haojian.zhuang@...vell.com>
Cc: haojian.zhuang@...il.com, linux-kernel@...r.kernel.org,
linux@....linux.org.uk
Subject: Re: [PATCH 01/01] gpio: support pca9574 and pca9575
On Mon, Apr 18, 2011 at 10:12:46PM +0800, Haojian Zhuang wrote:
> PCA957x is i2c gpio expander, and similar to PCA953x. Although register
> configurations are different between PCA957x and PCA953x. They can share
> a lot of components, such as IRQ handling, GPIO IN/OUT. So updating PCA953x
> driver to support PCA957x chips.
>
> Signed-off-by: Haojian Zhuang <haojian.zhuang@...vell.com>
> Cc: Grant Likely <grant.likely@...retlab.ca>
Applied, thanks.
g.
> ---
> drivers/gpio/pca953x.c | 249 +++++++++++++++++++++++++++++++++++++-----------
> 1 files changed, 191 insertions(+), 58 deletions(-)
>
> diff --git a/drivers/gpio/pca953x.c b/drivers/gpio/pca953x.c
> index b473429..0de208f 100644
> --- a/drivers/gpio/pca953x.c
> +++ b/drivers/gpio/pca953x.c
> @@ -24,33 +24,46 @@
> #include <linux/of_gpio.h>
> #endif
>
> -#define PCA953X_INPUT 0
> -#define PCA953X_OUTPUT 1
> -#define PCA953X_INVERT 2
> -#define PCA953X_DIRECTION 3
> -
> -#define PCA953X_GPIOS 0x00FF
> -#define PCA953X_INT 0x0100
> +#define PCA953X_INPUT 0
> +#define PCA953X_OUTPUT 1
> +#define PCA953X_INVERT 2
> +#define PCA953X_DIRECTION 3
> +
> +#define PCA957X_IN 0
> +#define PCA957X_INVRT 1
> +#define PCA957X_BKEN 2
> +#define PCA957X_PUPD 3
> +#define PCA957X_CFG 4
> +#define PCA957X_OUT 5
> +#define PCA957X_MSK 6
> +#define PCA957X_INTS 7
> +
> +#define PCA_GPIO_MASK 0x00FF
> +#define PCA_INT 0x0100
> +#define PCA953X_TYPE 0x1000
> +#define PCA957X_TYPE 0x2000
>
> static const struct i2c_device_id pca953x_id[] = {
> - { "pca9534", 8 | PCA953X_INT, },
> - { "pca9535", 16 | PCA953X_INT, },
> - { "pca9536", 4, },
> - { "pca9537", 4 | PCA953X_INT, },
> - { "pca9538", 8 | PCA953X_INT, },
> - { "pca9539", 16 | PCA953X_INT, },
> - { "pca9554", 8 | PCA953X_INT, },
> - { "pca9555", 16 | PCA953X_INT, },
> - { "pca9556", 8, },
> - { "pca9557", 8, },
> -
> - { "max7310", 8, },
> - { "max7312", 16 | PCA953X_INT, },
> - { "max7313", 16 | PCA953X_INT, },
> - { "max7315", 8 | PCA953X_INT, },
> - { "pca6107", 8 | PCA953X_INT, },
> - { "tca6408", 8 | PCA953X_INT, },
> - { "tca6416", 16 | PCA953X_INT, },
> + { "pca9534", 8 | PCA953X_TYPE | PCA_INT, },
> + { "pca9535", 16 | PCA953X_TYPE | PCA_INT, },
> + { "pca9536", 4 | PCA953X_TYPE, },
> + { "pca9537", 4 | PCA953X_TYPE | PCA_INT, },
> + { "pca9538", 8 | PCA953X_TYPE | PCA_INT, },
> + { "pca9539", 16 | PCA953X_TYPE | PCA_INT, },
> + { "pca9554", 8 | PCA953X_TYPE | PCA_INT, },
> + { "pca9555", 16 | PCA953X_TYPE | PCA_INT, },
> + { "pca9556", 8 | PCA953X_TYPE, },
> + { "pca9557", 8 | PCA953X_TYPE, },
> + { "pca9574", 8 | PCA957X_TYPE | PCA_INT, },
> + { "pca9575", 16 | PCA957X_TYPE | PCA_INT, },
> +
> + { "max7310", 8 | PCA953X_TYPE, },
> + { "max7312", 16 | PCA953X_TYPE | PCA_INT, },
> + { "max7313", 16 | PCA953X_TYPE | PCA_INT, },
> + { "max7315", 8 | PCA953X_TYPE | PCA_INT, },
> + { "pca6107", 8 | PCA953X_TYPE | PCA_INT, },
> + { "tca6408", 8 | PCA953X_TYPE | PCA_INT, },
> + { "tca6416", 16 | PCA953X_TYPE | PCA_INT, },
> /* NYET: { "tca6424", 24, }, */
> { }
> };
> @@ -75,16 +88,32 @@ struct pca953x_chip {
> struct pca953x_platform_data *dyn_pdata;
> struct gpio_chip gpio_chip;
> const char *const *names;
> + int chip_type;
> };
>
> static int pca953x_write_reg(struct pca953x_chip *chip, int reg, uint16_t val)
> {
> - int ret;
> + int ret = 0;
>
> if (chip->gpio_chip.ngpio <= 8)
> ret = i2c_smbus_write_byte_data(chip->client, reg, val);
> - else
> - ret = i2c_smbus_write_word_data(chip->client, reg << 1, val);
> + else {
> + switch (chip->chip_type) {
> + case PCA953X_TYPE:
> + ret = i2c_smbus_write_word_data(chip->client,
> + reg << 1, val);
> + break;
> + case PCA957X_TYPE:
> + ret = i2c_smbus_write_byte_data(chip->client, reg << 1,
> + val & 0xff);
> + if (ret < 0)
> + break;
> + ret = i2c_smbus_write_byte_data(chip->client,
> + (reg << 1) + 1,
> + (val & 0xff00) >> 8);
> + break;
> + }
> + }
>
> if (ret < 0) {
> dev_err(&chip->client->dev, "failed writing register\n");
> @@ -116,13 +145,22 @@ static int pca953x_gpio_direction_input(struct gpio_chip *gc, unsigned off)
> {
> struct pca953x_chip *chip;
> uint16_t reg_val;
> - int ret;
> + int ret, offset = 0;
>
> chip = container_of(gc, struct pca953x_chip, gpio_chip);
>
> mutex_lock(&chip->i2c_lock);
> reg_val = chip->reg_direction | (1u << off);
> - ret = pca953x_write_reg(chip, PCA953X_DIRECTION, reg_val);
> +
> + switch (chip->chip_type) {
> + case PCA953X_TYPE:
> + offset = PCA953X_DIRECTION;
> + break;
> + case PCA957X_TYPE:
> + offset = PCA957X_CFG;
> + break;
> + }
> + ret = pca953x_write_reg(chip, offset, reg_val);
> if (ret)
> goto exit;
>
> @@ -138,7 +176,7 @@ static int pca953x_gpio_direction_output(struct gpio_chip *gc,
> {
> struct pca953x_chip *chip;
> uint16_t reg_val;
> - int ret;
> + int ret, offset = 0;
>
> chip = container_of(gc, struct pca953x_chip, gpio_chip);
>
> @@ -149,7 +187,15 @@ static int pca953x_gpio_direction_output(struct gpio_chip *gc,
> else
> reg_val = chip->reg_output & ~(1u << off);
>
> - ret = pca953x_write_reg(chip, PCA953X_OUTPUT, reg_val);
> + switch (chip->chip_type) {
> + case PCA953X_TYPE:
> + offset = PCA953X_OUTPUT;
> + break;
> + case PCA957X_TYPE:
> + offset = PCA957X_OUT;
> + break;
> + }
> + ret = pca953x_write_reg(chip, offset, reg_val);
> if (ret)
> goto exit;
>
> @@ -157,7 +203,15 @@ static int pca953x_gpio_direction_output(struct gpio_chip *gc,
>
> /* then direction */
> reg_val = chip->reg_direction & ~(1u << off);
> - ret = pca953x_write_reg(chip, PCA953X_DIRECTION, reg_val);
> + switch (chip->chip_type) {
> + case PCA953X_TYPE:
> + offset = PCA953X_DIRECTION;
> + break;
> + case PCA957X_TYPE:
> + offset = PCA957X_CFG;
> + break;
> + }
> + ret = pca953x_write_reg(chip, offset, reg_val);
> if (ret)
> goto exit;
>
> @@ -172,12 +226,20 @@ static int pca953x_gpio_get_value(struct gpio_chip *gc, unsigned off)
> {
> struct pca953x_chip *chip;
> uint16_t reg_val;
> - int ret;
> + int ret, offset = 0;
>
> chip = container_of(gc, struct pca953x_chip, gpio_chip);
>
> mutex_lock(&chip->i2c_lock);
> - ret = pca953x_read_reg(chip, PCA953X_INPUT, ®_val);
> + switch (chip->chip_type) {
> + case PCA953X_TYPE:
> + offset = PCA953X_INPUT;
> + break;
> + case PCA957X_TYPE:
> + offset = PCA957X_IN;
> + break;
> + }
> + ret = pca953x_read_reg(chip, offset, ®_val);
> mutex_unlock(&chip->i2c_lock);
> if (ret < 0) {
> /* NOTE: diagnostic already emitted; that's all we should
> @@ -194,7 +256,7 @@ static void pca953x_gpio_set_value(struct gpio_chip *gc, unsigned off, int val)
> {
> struct pca953x_chip *chip;
> uint16_t reg_val;
> - int ret;
> + int ret, offset = 0;
>
> chip = container_of(gc, struct pca953x_chip, gpio_chip);
>
> @@ -204,7 +266,15 @@ static void pca953x_gpio_set_value(struct gpio_chip *gc, unsigned off, int val)
> else
> reg_val = chip->reg_output & ~(1u << off);
>
> - ret = pca953x_write_reg(chip, PCA953X_OUTPUT, reg_val);
> + switch (chip->chip_type) {
> + case PCA953X_TYPE:
> + offset = PCA953X_OUTPUT;
> + break;
> + case PCA957X_TYPE:
> + offset = PCA957X_OUT;
> + break;
> + }
> + ret = pca953x_write_reg(chip, offset, reg_val);
> if (ret)
> goto exit;
>
> @@ -322,9 +392,17 @@ static uint16_t pca953x_irq_pending(struct pca953x_chip *chip)
> uint16_t old_stat;
> uint16_t pending;
> uint16_t trigger;
> - int ret;
> -
> - ret = pca953x_read_reg(chip, PCA953X_INPUT, &cur_stat);
> + int ret, offset = 0;
> +
> + switch (chip->chip_type) {
> + case PCA953X_TYPE:
> + offset = PCA953X_INPUT;
> + break;
> + case PCA957X_TYPE:
> + offset = PCA957X_IN;
> + break;
> + }
> + ret = pca953x_read_reg(chip, offset, &cur_stat);
> if (ret)
> return 0;
>
> @@ -372,14 +450,21 @@ static int pca953x_irq_setup(struct pca953x_chip *chip,
> {
> struct i2c_client *client = chip->client;
> struct pca953x_platform_data *pdata = client->dev.platform_data;
> - int ret;
> + int ret, offset = 0;
>
> if (pdata->irq_base != -1
> - && (id->driver_data & PCA953X_INT)) {
> + && (id->driver_data & PCA_INT)) {
> int lvl;
>
> - ret = pca953x_read_reg(chip, PCA953X_INPUT,
> - &chip->irq_stat);
> + switch (chip->chip_type) {
> + case PCA953X_TYPE:
> + offset = PCA953X_INPUT;
> + break;
> + case PCA957X_TYPE:
> + offset = PCA957X_IN;
> + break;
> + }
> + ret = pca953x_read_reg(chip, offset, &chip->irq_stat);
> if (ret)
> goto out_failed;
>
> @@ -439,7 +524,7 @@ static int pca953x_irq_setup(struct pca953x_chip *chip,
> struct i2c_client *client = chip->client;
> struct pca953x_platform_data *pdata = client->dev.platform_data;
>
> - if (pdata->irq_base != -1 && (id->driver_data & PCA953X_INT))
> + if (pdata->irq_base != -1 && (id->driver_data & PCA_INT))
> dev_warn(&client->dev, "interrupt support not compiled in\n");
>
> return 0;
> @@ -498,12 +583,65 @@ pca953x_get_alt_pdata(struct i2c_client *client)
> }
> #endif
>
> +static int __devinit device_pca953x_init(struct pca953x_chip *chip, int invert)
> +{
> + int ret;
> +
> + ret = pca953x_read_reg(chip, PCA953X_OUTPUT, &chip->reg_output);
> + if (ret)
> + goto out;
> +
> + ret = pca953x_read_reg(chip, PCA953X_DIRECTION,
> + &chip->reg_direction);
> + if (ret)
> + goto out;
> +
> + /* set platform specific polarity inversion */
> + ret = pca953x_write_reg(chip, PCA953X_INVERT, invert);
> + if (ret)
> + goto out;
> + return 0;
> +out:
> + return ret;
> +}
> +
> +static int __devinit device_pca957x_init(struct pca953x_chip *chip, int invert)
> +{
> + int ret;
> + uint16_t val = 0;
> +
> + /* Let every port in proper state, that could save power */
> + pca953x_write_reg(chip, PCA957X_PUPD, 0x0);
> + pca953x_write_reg(chip, PCA957X_CFG, 0xffff);
> + pca953x_write_reg(chip, PCA957X_OUT, 0x0);
> +
> + ret = pca953x_read_reg(chip, PCA957X_IN, &val);
> + if (ret)
> + goto out;
> + ret = pca953x_read_reg(chip, PCA957X_OUT, &chip->reg_output);
> + if (ret)
> + goto out;
> + ret = pca953x_read_reg(chip, PCA957X_CFG, &chip->reg_direction);
> + if (ret)
> + goto out;
> +
> + /* set platform specific polarity inversion */
> + pca953x_write_reg(chip, PCA957X_INVRT, invert);
> +
> + /* To enable register 6, 7 to controll pull up and pull down */
> + pca953x_write_reg(chip, PCA957X_BKEN, 0x202);
> +
> + return 0;
> +out:
> + return ret;
> +}
> +
> static int __devinit pca953x_probe(struct i2c_client *client,
> const struct i2c_device_id *id)
> {
> struct pca953x_platform_data *pdata;
> struct pca953x_chip *chip;
> - int ret;
> + int ret = 0;
>
> chip = kzalloc(sizeof(struct pca953x_chip), GFP_KERNEL);
> if (chip == NULL)
> @@ -530,25 +668,20 @@ static int __devinit pca953x_probe(struct i2c_client *client,
> chip->gpio_start = pdata->gpio_base;
>
> chip->names = pdata->names;
> + chip->chip_type = id->driver_data & (PCA953X_TYPE | PCA957X_TYPE);
>
> mutex_init(&chip->i2c_lock);
>
> /* initialize cached registers from their original values.
> * we can't share this chip with another i2c master.
> */
> - pca953x_setup_gpio(chip, id->driver_data & PCA953X_GPIOS);
> + pca953x_setup_gpio(chip, id->driver_data & PCA_GPIO_MASK);
>
> - ret = pca953x_read_reg(chip, PCA953X_OUTPUT, &chip->reg_output);
> - if (ret)
> - goto out_failed;
> -
> - ret = pca953x_read_reg(chip, PCA953X_DIRECTION, &chip->reg_direction);
> - if (ret)
> - goto out_failed;
> -
> - /* set platform specific polarity inversion */
> - ret = pca953x_write_reg(chip, PCA953X_INVERT, pdata->invert);
> - if (ret)
> + if (chip->chip_type == PCA953X_TYPE)
> + device_pca953x_init(chip, pdata->invert);
> + else if (chip->chip_type == PCA957X_TYPE)
> + device_pca957x_init(chip, pdata->invert);
> + else
> goto out_failed;
>
> ret = pca953x_irq_setup(chip, id);
> --
> 1.5.6.5
>
--
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