gpio/pca953x: Add support for pca9574 and pca9575 devices
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@marvell.com> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>hifive-unleashed-5.1
Haojian Zhuang
Grant Likely
parent
073cc4e95a
commit
33226ffd07
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@ -24,33 +24,46 @@
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#include <linux/of_gpio.h>
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#endif
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#define PCA953X_INPUT 0
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#define PCA953X_OUTPUT 1
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#define PCA953X_INVERT 2
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#define PCA953X_DIRECTION 3
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#define PCA953X_INPUT 0
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#define PCA953X_OUTPUT 1
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#define PCA953X_INVERT 2
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#define PCA953X_DIRECTION 3
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#define PCA953X_GPIOS 0x00FF
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#define PCA953X_INT 0x0100
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#define PCA957X_IN 0
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#define PCA957X_INVRT 1
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#define PCA957X_BKEN 2
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#define PCA957X_PUPD 3
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#define PCA957X_CFG 4
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#define PCA957X_OUT 5
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#define PCA957X_MSK 6
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#define PCA957X_INTS 7
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#define PCA_GPIO_MASK 0x00FF
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#define PCA_INT 0x0100
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#define PCA953X_TYPE 0x1000
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#define PCA957X_TYPE 0x2000
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static const struct i2c_device_id pca953x_id[] = {
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{ "pca9534", 8 | PCA953X_INT, },
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{ "pca9535", 16 | PCA953X_INT, },
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{ "pca9536", 4, },
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{ "pca9537", 4 | PCA953X_INT, },
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{ "pca9538", 8 | PCA953X_INT, },
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{ "pca9539", 16 | PCA953X_INT, },
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{ "pca9554", 8 | PCA953X_INT, },
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{ "pca9555", 16 | PCA953X_INT, },
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{ "pca9556", 8, },
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{ "pca9557", 8, },
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{ "pca9534", 8 | PCA953X_TYPE | PCA_INT, },
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{ "pca9535", 16 | PCA953X_TYPE | PCA_INT, },
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{ "pca9536", 4 | PCA953X_TYPE, },
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{ "pca9537", 4 | PCA953X_TYPE | PCA_INT, },
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{ "pca9538", 8 | PCA953X_TYPE | PCA_INT, },
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{ "pca9539", 16 | PCA953X_TYPE | PCA_INT, },
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{ "pca9554", 8 | PCA953X_TYPE | PCA_INT, },
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{ "pca9555", 16 | PCA953X_TYPE | PCA_INT, },
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{ "pca9556", 8 | PCA953X_TYPE, },
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{ "pca9557", 8 | PCA953X_TYPE, },
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{ "pca9574", 8 | PCA957X_TYPE | PCA_INT, },
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{ "pca9575", 16 | PCA957X_TYPE | PCA_INT, },
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{ "max7310", 8, },
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{ "max7312", 16 | PCA953X_INT, },
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{ "max7313", 16 | PCA953X_INT, },
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{ "max7315", 8 | PCA953X_INT, },
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{ "pca6107", 8 | PCA953X_INT, },
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{ "tca6408", 8 | PCA953X_INT, },
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{ "tca6416", 16 | PCA953X_INT, },
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{ "max7310", 8 | PCA953X_TYPE, },
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{ "max7312", 16 | PCA953X_TYPE | PCA_INT, },
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{ "max7313", 16 | PCA953X_TYPE | PCA_INT, },
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{ "max7315", 8 | PCA953X_TYPE | PCA_INT, },
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{ "pca6107", 8 | PCA953X_TYPE | PCA_INT, },
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{ "tca6408", 8 | PCA953X_TYPE | PCA_INT, },
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{ "tca6416", 16 | PCA953X_TYPE | PCA_INT, },
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/* NYET: { "tca6424", 24, }, */
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{ }
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};
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@ -75,16 +88,32 @@ struct pca953x_chip {
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struct pca953x_platform_data *dyn_pdata;
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struct gpio_chip gpio_chip;
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const char *const *names;
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int chip_type;
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};
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static int pca953x_write_reg(struct pca953x_chip *chip, int reg, uint16_t val)
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{
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int ret;
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int ret = 0;
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if (chip->gpio_chip.ngpio <= 8)
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ret = i2c_smbus_write_byte_data(chip->client, reg, val);
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else
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ret = i2c_smbus_write_word_data(chip->client, reg << 1, val);
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else {
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switch (chip->chip_type) {
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case PCA953X_TYPE:
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ret = i2c_smbus_write_word_data(chip->client,
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reg << 1, val);
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break;
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case PCA957X_TYPE:
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ret = i2c_smbus_write_byte_data(chip->client, reg << 1,
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val & 0xff);
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if (ret < 0)
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break;
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ret = i2c_smbus_write_byte_data(chip->client,
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(reg << 1) + 1,
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(val & 0xff00) >> 8);
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break;
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}
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}
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if (ret < 0) {
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dev_err(&chip->client->dev, "failed writing register\n");
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@ -116,13 +145,22 @@ static int pca953x_gpio_direction_input(struct gpio_chip *gc, unsigned off)
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{
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struct pca953x_chip *chip;
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uint16_t reg_val;
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int ret;
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int ret, offset = 0;
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chip = container_of(gc, struct pca953x_chip, gpio_chip);
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mutex_lock(&chip->i2c_lock);
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reg_val = chip->reg_direction | (1u << off);
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ret = pca953x_write_reg(chip, PCA953X_DIRECTION, reg_val);
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switch (chip->chip_type) {
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case PCA953X_TYPE:
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offset = PCA953X_DIRECTION;
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break;
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case PCA957X_TYPE:
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offset = PCA957X_CFG;
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break;
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}
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ret = pca953x_write_reg(chip, offset, reg_val);
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if (ret)
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goto exit;
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@ -138,7 +176,7 @@ static int pca953x_gpio_direction_output(struct gpio_chip *gc,
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{
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struct pca953x_chip *chip;
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uint16_t reg_val;
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int ret;
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int ret, offset = 0;
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chip = container_of(gc, struct pca953x_chip, gpio_chip);
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@ -149,7 +187,15 @@ static int pca953x_gpio_direction_output(struct gpio_chip *gc,
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else
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reg_val = chip->reg_output & ~(1u << off);
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ret = pca953x_write_reg(chip, PCA953X_OUTPUT, reg_val);
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switch (chip->chip_type) {
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case PCA953X_TYPE:
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offset = PCA953X_OUTPUT;
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break;
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case PCA957X_TYPE:
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offset = PCA957X_OUT;
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break;
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}
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ret = pca953x_write_reg(chip, offset, reg_val);
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if (ret)
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goto exit;
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@ -157,7 +203,15 @@ static int pca953x_gpio_direction_output(struct gpio_chip *gc,
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/* then direction */
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reg_val = chip->reg_direction & ~(1u << off);
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ret = pca953x_write_reg(chip, PCA953X_DIRECTION, reg_val);
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switch (chip->chip_type) {
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case PCA953X_TYPE:
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offset = PCA953X_DIRECTION;
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break;
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case PCA957X_TYPE:
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offset = PCA957X_CFG;
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break;
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}
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ret = pca953x_write_reg(chip, offset, reg_val);
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if (ret)
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goto exit;
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@ -172,12 +226,20 @@ static int pca953x_gpio_get_value(struct gpio_chip *gc, unsigned off)
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{
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struct pca953x_chip *chip;
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uint16_t reg_val;
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int ret;
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int ret, offset = 0;
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chip = container_of(gc, struct pca953x_chip, gpio_chip);
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mutex_lock(&chip->i2c_lock);
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ret = pca953x_read_reg(chip, PCA953X_INPUT, ®_val);
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switch (chip->chip_type) {
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case PCA953X_TYPE:
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offset = PCA953X_INPUT;
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break;
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case PCA957X_TYPE:
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offset = PCA957X_IN;
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break;
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}
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ret = pca953x_read_reg(chip, offset, ®_val);
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mutex_unlock(&chip->i2c_lock);
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if (ret < 0) {
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/* NOTE: diagnostic already emitted; that's all we should
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@ -194,7 +256,7 @@ static void pca953x_gpio_set_value(struct gpio_chip *gc, unsigned off, int val)
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{
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struct pca953x_chip *chip;
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uint16_t reg_val;
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int ret;
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int ret, offset = 0;
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chip = container_of(gc, struct pca953x_chip, gpio_chip);
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@ -204,7 +266,15 @@ static void pca953x_gpio_set_value(struct gpio_chip *gc, unsigned off, int val)
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else
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reg_val = chip->reg_output & ~(1u << off);
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ret = pca953x_write_reg(chip, PCA953X_OUTPUT, reg_val);
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switch (chip->chip_type) {
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case PCA953X_TYPE:
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offset = PCA953X_OUTPUT;
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break;
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case PCA957X_TYPE:
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offset = PCA957X_OUT;
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break;
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}
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ret = pca953x_write_reg(chip, offset, reg_val);
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if (ret)
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goto exit;
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@ -322,9 +392,17 @@ static uint16_t pca953x_irq_pending(struct pca953x_chip *chip)
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uint16_t old_stat;
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uint16_t pending;
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uint16_t trigger;
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int ret;
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int ret, offset = 0;
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ret = pca953x_read_reg(chip, PCA953X_INPUT, &cur_stat);
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switch (chip->chip_type) {
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case PCA953X_TYPE:
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offset = PCA953X_INPUT;
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break;
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case PCA957X_TYPE:
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offset = PCA957X_IN;
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break;
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}
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ret = pca953x_read_reg(chip, offset, &cur_stat);
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if (ret)
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return 0;
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@ -372,14 +450,21 @@ static int pca953x_irq_setup(struct pca953x_chip *chip,
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{
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struct i2c_client *client = chip->client;
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struct pca953x_platform_data *pdata = client->dev.platform_data;
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int ret;
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int ret, offset = 0;
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if (pdata->irq_base != -1
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&& (id->driver_data & PCA953X_INT)) {
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&& (id->driver_data & PCA_INT)) {
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int lvl;
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ret = pca953x_read_reg(chip, PCA953X_INPUT,
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&chip->irq_stat);
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switch (chip->chip_type) {
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case PCA953X_TYPE:
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offset = PCA953X_INPUT;
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break;
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case PCA957X_TYPE:
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offset = PCA957X_IN;
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break;
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}
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ret = pca953x_read_reg(chip, offset, &chip->irq_stat);
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if (ret)
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goto out_failed;
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@ -439,7 +524,7 @@ static int pca953x_irq_setup(struct pca953x_chip *chip,
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struct i2c_client *client = chip->client;
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struct pca953x_platform_data *pdata = client->dev.platform_data;
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if (pdata->irq_base != -1 && (id->driver_data & PCA953X_INT))
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if (pdata->irq_base != -1 && (id->driver_data & PCA_INT))
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dev_warn(&client->dev, "interrupt support not compiled in\n");
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return 0;
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@ -499,12 +584,65 @@ pca953x_get_alt_pdata(struct i2c_client *client)
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}
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#endif
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static int __devinit device_pca953x_init(struct pca953x_chip *chip, int invert)
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{
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int ret;
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ret = pca953x_read_reg(chip, PCA953X_OUTPUT, &chip->reg_output);
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if (ret)
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goto out;
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ret = pca953x_read_reg(chip, PCA953X_DIRECTION,
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&chip->reg_direction);
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if (ret)
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goto out;
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/* set platform specific polarity inversion */
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ret = pca953x_write_reg(chip, PCA953X_INVERT, invert);
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if (ret)
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goto out;
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return 0;
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out:
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return ret;
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}
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static int __devinit device_pca957x_init(struct pca953x_chip *chip, int invert)
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{
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int ret;
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uint16_t val = 0;
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/* Let every port in proper state, that could save power */
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pca953x_write_reg(chip, PCA957X_PUPD, 0x0);
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pca953x_write_reg(chip, PCA957X_CFG, 0xffff);
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pca953x_write_reg(chip, PCA957X_OUT, 0x0);
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ret = pca953x_read_reg(chip, PCA957X_IN, &val);
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if (ret)
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goto out;
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ret = pca953x_read_reg(chip, PCA957X_OUT, &chip->reg_output);
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if (ret)
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goto out;
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ret = pca953x_read_reg(chip, PCA957X_CFG, &chip->reg_direction);
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if (ret)
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goto out;
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/* set platform specific polarity inversion */
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pca953x_write_reg(chip, PCA957X_INVRT, invert);
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/* To enable register 6, 7 to controll pull up and pull down */
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pca953x_write_reg(chip, PCA957X_BKEN, 0x202);
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return 0;
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out:
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return ret;
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}
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static int __devinit pca953x_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct pca953x_platform_data *pdata;
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struct pca953x_chip *chip;
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int ret;
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int ret = 0;
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chip = kzalloc(sizeof(struct pca953x_chip), GFP_KERNEL);
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if (chip == NULL)
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@ -531,25 +669,20 @@ static int __devinit pca953x_probe(struct i2c_client *client,
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chip->gpio_start = pdata->gpio_base;
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chip->names = pdata->names;
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chip->chip_type = id->driver_data & (PCA953X_TYPE | PCA957X_TYPE);
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mutex_init(&chip->i2c_lock);
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/* initialize cached registers from their original values.
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* we can't share this chip with another i2c master.
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*/
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pca953x_setup_gpio(chip, id->driver_data & PCA953X_GPIOS);
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pca953x_setup_gpio(chip, id->driver_data & PCA_GPIO_MASK);
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ret = pca953x_read_reg(chip, PCA953X_OUTPUT, &chip->reg_output);
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if (ret)
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goto out_failed;
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ret = pca953x_read_reg(chip, PCA953X_DIRECTION, &chip->reg_direction);
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if (ret)
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goto out_failed;
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/* set platform specific polarity inversion */
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ret = pca953x_write_reg(chip, PCA953X_INVERT, pdata->invert);
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if (ret)
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if (chip->chip_type == PCA953X_TYPE)
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device_pca953x_init(chip, pdata->invert);
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else if (chip->chip_type == PCA957X_TYPE)
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device_pca957x_init(chip, pdata->invert);
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else
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goto out_failed;
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ret = pca953x_irq_setup(chip, id);
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