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gpio: sx150x: add support for sx1506 gpio expander device
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semtech has two series of sx150x gpio expanders: sx150x-456 and
sx150x-789.

The current gpio-150x driver in linux only support sx1508 and
sx1509.

We added sx1506 support code into this driver.

Signed-off-by: Wei Chen <Wei.Chen@csr.com>
Signed-off-by: Barry Song <Baohua.Song@csr.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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Wei Chen authored and Linus Walleij committed Jan 15, 2015
1 parent 093e943 commit ae9ca49
Showing 1 changed file with 112 additions and 45 deletions.
157 changes: 112 additions & 45 deletions drivers/gpio/gpio-sx150x.c
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Original file line number Diff line number Diff line change
Expand Up @@ -26,20 +26,43 @@

#define NO_UPDATE_PENDING -1

/* The chip models of sx150x */
#define SX150X_456 0
#define SX150X_789 1

struct sx150x_456_pri {
u8 reg_pld_mode;
u8 reg_pld_table0;
u8 reg_pld_table1;
u8 reg_pld_table2;
u8 reg_pld_table3;
u8 reg_pld_table4;
u8 reg_advance;
};

struct sx150x_789_pri {
u8 reg_drain;
u8 reg_polarity;
u8 reg_clock;
u8 reg_misc;
u8 reg_reset;
u8 ngpios;
};

struct sx150x_device_data {
u8 model;
u8 reg_pullup;
u8 reg_pulldn;
u8 reg_drain;
u8 reg_polarity;
u8 reg_dir;
u8 reg_data;
u8 reg_irq_mask;
u8 reg_irq_src;
u8 reg_sense;
u8 reg_clock;
u8 reg_misc;
u8 reg_reset;
u8 ngpios;
union {
struct sx150x_456_pri x456;
struct sx150x_789_pri x789;
} pri;
};

struct sx150x_chip {
Expand All @@ -59,40 +82,67 @@ struct sx150x_chip {

static const struct sx150x_device_data sx150x_devices[] = {
[0] = { /* sx1508q */
.reg_pullup = 0x03,
.reg_pulldn = 0x04,
.reg_drain = 0x05,
.reg_polarity = 0x06,
.reg_dir = 0x07,
.reg_data = 0x08,
.reg_irq_mask = 0x09,
.reg_irq_src = 0x0c,
.reg_sense = 0x0b,
.reg_clock = 0x0f,
.reg_misc = 0x10,
.reg_reset = 0x7d,
.ngpios = 8
.model = SX150X_789,
.reg_pullup = 0x03,
.reg_pulldn = 0x04,
.reg_dir = 0x07,
.reg_data = 0x08,
.reg_irq_mask = 0x09,
.reg_irq_src = 0x0c,
.reg_sense = 0x0b,
.pri.x789 = {
.reg_drain = 0x05,
.reg_polarity = 0x06,
.reg_clock = 0x0f,
.reg_misc = 0x10,
.reg_reset = 0x7d,
},
.ngpios = 8,
},
[1] = { /* sx1509q */
.reg_pullup = 0x07,
.reg_pulldn = 0x09,
.reg_drain = 0x0b,
.reg_polarity = 0x0d,
.reg_dir = 0x0f,
.reg_data = 0x11,
.reg_irq_mask = 0x13,
.reg_irq_src = 0x19,
.reg_sense = 0x17,
.reg_clock = 0x1e,
.reg_misc = 0x1f,
.reg_reset = 0x7d,
.ngpios = 16
.model = SX150X_789,
.reg_pullup = 0x07,
.reg_pulldn = 0x09,
.reg_dir = 0x0f,
.reg_data = 0x11,
.reg_irq_mask = 0x13,
.reg_irq_src = 0x19,
.reg_sense = 0x17,
.pri.x789 = {
.reg_drain = 0x0b,
.reg_polarity = 0x0d,
.reg_clock = 0x1e,
.reg_misc = 0x1f,
.reg_reset = 0x7d,
},
.ngpios = 16
},
[2] = { /* sx1506q */
.model = SX150X_456,
.reg_pullup = 0x05,
.reg_pulldn = 0x07,
.reg_dir = 0x03,
.reg_data = 0x01,
.reg_irq_mask = 0x09,
.reg_irq_src = 0x0f,
.reg_sense = 0x0d,
.pri.x456 = {
.reg_pld_mode = 0x21,
.reg_pld_table0 = 0x23,
.reg_pld_table1 = 0x25,
.reg_pld_table2 = 0x27,
.reg_pld_table3 = 0x29,
.reg_pld_table4 = 0x2b,
.reg_advance = 0xad,
},
.ngpios = 16
},
};

static const struct i2c_device_id sx150x_id[] = {
{"sx1508q", 0},
{"sx1509q", 1},
{"sx1506q", 2},
{}
};
MODULE_DEVICE_TABLE(i2c, sx150x_id);
Expand Down Expand Up @@ -191,7 +241,7 @@ 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->dev_cfg->reg_clock,
chip->dev_cfg->pri.x789.reg_clock,
(val ? 0x1f : 0x10));
}

Expand Down Expand Up @@ -455,13 +505,13 @@ static int sx150x_reset(struct sx150x_chip *chip)
int err;

err = i2c_smbus_write_byte_data(chip->client,
chip->dev_cfg->reg_reset,
chip->dev_cfg->pri.x789.reg_reset,
0x12);
if (err < 0)
return err;

err = i2c_smbus_write_byte_data(chip->client,
chip->dev_cfg->reg_reset,
chip->dev_cfg->pri.x789.reg_reset,
0x34);
return err;
}
Expand All @@ -477,9 +527,14 @@ static int sx150x_init_hw(struct sx150x_chip *chip,
return err;
}

err = sx150x_i2c_write(chip->client,
chip->dev_cfg->reg_misc,
0x01);
if (chip->dev_cfg->model == SX150X_789)
err = sx150x_i2c_write(chip->client,
chip->dev_cfg->pri.x789.reg_misc,
0x01);
else
err = sx150x_i2c_write(chip->client,
chip->dev_cfg->pri.x456.reg_advance,
0x04);
if (err < 0)
return err;

Expand All @@ -493,15 +548,27 @@ static int sx150x_init_hw(struct sx150x_chip *chip,
if (err < 0)
return err;

err = sx150x_init_io(chip, chip->dev_cfg->reg_drain,
pdata->io_open_drain_ena);
if (err < 0)
return err;
if (chip->dev_cfg->model == SX150X_789) {
err = sx150x_init_io(chip,
chip->dev_cfg->pri.x789.reg_drain,
pdata->io_open_drain_ena);
if (err < 0)
return err;

err = sx150x_init_io(chip,
chip->dev_cfg->pri.x789.reg_polarity,
pdata->io_polarity);
if (err < 0)
return err;
} else {
/* Set all pins to work in normal mode */
err = sx150x_init_io(chip,
chip->dev_cfg->pri.x456.reg_pld_mode,
0);
if (err < 0)
return err;
}

err = sx150x_init_io(chip, chip->dev_cfg->reg_polarity,
pdata->io_polarity);
if (err < 0)
return err;

if (pdata->oscio_is_gpo)
sx150x_set_oscio(chip, 0);
Expand Down

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