diff options
| -rw-r--r-- | drivers/regulator/max1586.c | 71 | ||||
| -rw-r--r-- | include/linux/regulator/max1586.h | 11 |
2 files changed, 63 insertions, 19 deletions
diff --git a/drivers/regulator/max1586.c b/drivers/regulator/max1586.c index bbbb55f..92799f4 100644 --- a/drivers/regulator/max1586.c +++ b/drivers/regulator/max1586.c @@ -29,7 +29,6 @@ #define MAX1586_V3_MIN_UV 700000 #define MAX1586_V3_MAX_UV 1475000 -#define MAX1586_V3_STEP_UV 25000 #define MAX1586_V6_MIN_UV 0 #define MAX1586_V6_MAX_UV 3000000 @@ -37,33 +36,52 @@ #define I2C_V3_SELECT (0 << 5) #define I2C_V6_SELECT (1 << 5) +struct max1586_data { + struct i2c_client *client; + + /* min/max V3 voltage */ + int min_uV; + int max_uV; + + struct regulator_dev *rdev[0]; +}; + /* * V3 voltage * On I2C bus, sending a "x" byte to the max1586 means : * set V3 to 0.700V + (x & 0x1f) * 0.025V + * This voltage can be increased by external resistors + * R24 and R25=100kOhm as described in the data sheet. + * The gain is approximately: 1 + R24/R25 + R24/185.5kOhm */ -static int max1586_v3_calc_voltage(unsigned selector) +static int max1586_v3_calc_voltage(struct max1586_data *max1586, + unsigned selector) { - return MAX1586_V3_MIN_UV + (MAX1586_V3_STEP_UV * selector); + unsigned range_uV = max1586->max_uV - max1586->min_uV; + + return max1586->min_uV + (selector * range_uV / MAX1586_V3_MAX_VSEL); } static int max1586_v3_set(struct regulator_dev *rdev, int min_uV, int max_uV) { - struct i2c_client *client = rdev_get_drvdata(rdev); + struct max1586_data *max1586 = rdev_get_drvdata(rdev); + struct i2c_client *client = max1586->client; + unsigned range_uV = max1586->max_uV - max1586->min_uV; unsigned selector; u8 v3_prog; - if (min_uV < MAX1586_V3_MIN_UV || min_uV > MAX1586_V3_MAX_UV) - return -EINVAL; - if (max_uV < MAX1586_V3_MIN_UV || max_uV > MAX1586_V3_MAX_UV) + if (min_uV > max1586->max_uV || max_uV < max1586->min_uV) return -EINVAL; + if (min_uV < max1586->min_uV) + min_uV = max1586->min_uV; - selector = (min_uV - MAX1586_V3_MIN_UV) / MAX1586_V3_STEP_UV; - if (max1586_v3_calc_voltage(selector) > max_uV) + selector = ((min_uV - max1586->min_uV) * MAX1586_V3_MAX_VSEL + + range_uV - 1) / range_uV; + if (max1586_v3_calc_voltage(max1586, selector) > max_uV) return -EINVAL; dev_dbg(&client->dev, "changing voltage v3 to %dmv\n", - max1586_v3_calc_voltage(selector) / 1000); + max1586_v3_calc_voltage(max1586, selector) / 1000); v3_prog = I2C_V3_SELECT | (u8) selector; return i2c_smbus_write_byte(client, v3_prog); @@ -71,9 +89,11 @@ static int max1586_v3_set(struct regulator_dev *rdev, int min_uV, int max_uV) static int max1586_v3_list(struct regulator_dev *rdev, unsigned selector) { + struct max1586_data *max1586 = rdev_get_drvdata(rdev); + if (selector > MAX1586_V3_MAX_VSEL) return -EINVAL; - return max1586_v3_calc_voltage(selector); + return max1586_v3_calc_voltage(max1586, selector); } /* @@ -164,14 +184,25 @@ static int max1586_pmic_probe(struct i2c_client *client, { struct regulator_dev **rdev; struct max1586_platform_data *pdata = client->dev.platform_data; - int i, id, ret = 0; + struct max1586_data *max1586; + int i, id, ret = -ENOMEM; + + max1586 = kzalloc(sizeof(struct max1586_data) + + sizeof(struct regulator_dev *) * (MAX1586_V6 + 1), + GFP_KERNEL); + if (!max1586) + goto out; - rdev = kzalloc(sizeof(struct regulator_dev *) * (MAX1586_V6 + 1), - GFP_KERNEL); - if (!rdev) - return -ENOMEM; + max1586->client = client; - ret = -EINVAL; + if (!pdata->v3_gain) { + ret = -EINVAL; + goto out_unmap; + } + max1586->min_uV = MAX1586_V3_MIN_UV * pdata->v3_gain / 1000000; + max1586->max_uV = MAX1586_V3_MAX_UV * pdata->v3_gain / 1000000; + + rdev = max1586->rdev; for (i = 0; i < pdata->num_subdevs && i <= MAX1586_V6; i++) { id = pdata->subdevs[i].id; if (!pdata->subdevs[i].platform_data) @@ -182,7 +213,7 @@ static int max1586_pmic_probe(struct i2c_client *client, } rdev[i] = regulator_register(&max1586_reg[id], &client->dev, pdata->subdevs[i].platform_data, - client); + max1586); if (IS_ERR(rdev[i])) { ret = PTR_ERR(rdev[i]); dev_err(&client->dev, "failed to register %s\n", @@ -198,7 +229,9 @@ static int max1586_pmic_probe(struct i2c_client *client, err: while (--i >= 0) regulator_unregister(rdev[i]); - kfree(rdev); +out_unmap: + kfree(max1586); +out: return ret; } diff --git a/include/linux/regulator/max1586.h b/include/linux/regulator/max1586.h index 2056973..4456319 100644 --- a/include/linux/regulator/max1586.h +++ b/include/linux/regulator/max1586.h @@ -26,6 +26,12 @@ #define MAX1586_V3 0 #define MAX1586_V6 1 +/* precalculated values for v3_gain */ +#define MAX1586_GAIN_NO_R24 1000000 /* 700000 .. 1475000 mV */ +#define MAX1586_GAIN_R24_3k32 1051098 /* 735768 .. 1550369 mV */ +#define MAX1586_GAIN_R24_5k11 1078648 /* 755053 .. 1591005 mV */ +#define MAX1586_GAIN_R24_7k5 1115432 /* 780802 .. 1645262 mV */ + /** * max1586_subdev_data - regulator data * @id: regulator Id (either MAX1586_V3 or MAX1586_V6) @@ -43,10 +49,15 @@ struct max1586_subdev_data { * @num_subdevs: number of regultors used (may be 1 or 2) * @subdevs: regulator used * At most, there will be a regulator for V3 and one for V6 voltages. + * @v3_gain: gain on the V3 voltage output multiplied by 1e6. + * This can be calculated as ((1 + R24/R25 + R24/185.5kOhm) * 1e6) + * for an external resistor configuration as described in the + * data sheet (R25=100kOhm). */ struct max1586_platform_data { int num_subdevs; struct max1586_subdev_data *subdevs; + int v3_gain; }; #endif |