diff options
Diffstat (limited to 'drivers/media/i2c/ov2740.c')
| -rw-r--r-- | drivers/media/i2c/ov2740.c | 149 |
1 files changed, 146 insertions, 3 deletions
diff --git a/drivers/media/i2c/ov2740.c b/drivers/media/i2c/ov2740.c index 2dd2609db873..fd0b6a903ec1 100644 --- a/drivers/media/i2c/ov2740.c +++ b/drivers/media/i2c/ov2740.c @@ -7,6 +7,8 @@ #include <linux/i2c.h> #include <linux/module.h> #include <linux/pm_runtime.h> +#include <linux/nvmem-provider.h> +#include <linux/regmap.h> #include <media/v4l2-ctrls.h> #include <media/v4l2-device.h> #include <media/v4l2-fwnode.h> @@ -59,6 +61,21 @@ #define OV2740_TEST_PATTERN_ENABLE BIT(7) #define OV2740_TEST_PATTERN_BAR_SHIFT 2 +/* ISP CTRL00 */ +#define OV2740_REG_ISP_CTRL00 0x5000 +/* ISP CTRL01 */ +#define OV2740_REG_ISP_CTRL01 0x5001 +/* Customer Addresses: 0x7010 - 0x710F */ +#define CUSTOMER_USE_OTP_SIZE 0x100 +/* OTP registers from sensor */ +#define OV2740_REG_OTP_CUSTOMER 0x7010 + +struct nvm_data { + char *nvm_buffer; + struct nvmem_device *nvmem; + struct regmap *regmap; +}; + enum { OV2740_LINK_FREQ_360MHZ_INDEX, }; @@ -915,6 +932,130 @@ static int ov2740_remove(struct i2c_client *client) return 0; } +static int ov2740_load_otp_data(struct i2c_client *client, struct nvm_data *nvm) +{ + struct ov2740 *ov2740 = to_ov2740(i2c_get_clientdata(client)); + u32 isp_ctrl00 = 0; + u32 isp_ctrl01 = 0; + int ret; + + ret = ov2740_read_reg(ov2740, OV2740_REG_ISP_CTRL00, 1, &isp_ctrl00); + if (ret) { + dev_err(&client->dev, "failed to read ISP CTRL00\n"); + goto exit; + } + ret = ov2740_read_reg(ov2740, OV2740_REG_ISP_CTRL01, 1, &isp_ctrl01); + if (ret) { + dev_err(&client->dev, "failed to read ISP CTRL01\n"); + goto exit; + } + + /* Clear bit 5 of ISP CTRL00 */ + ret = ov2740_write_reg(ov2740, OV2740_REG_ISP_CTRL00, 1, + isp_ctrl00 & ~BIT(5)); + if (ret) { + dev_err(&client->dev, "failed to write ISP CTRL00\n"); + goto exit; + } + + /* Clear bit 7 of ISP CTRL01 */ + ret = ov2740_write_reg(ov2740, OV2740_REG_ISP_CTRL01, 1, + isp_ctrl01 & ~BIT(7)); + if (ret) { + dev_err(&client->dev, "failed to write ISP CTRL01\n"); + goto exit; + } + + ret = ov2740_write_reg(ov2740, OV2740_REG_MODE_SELECT, 1, + OV2740_MODE_STREAMING); + if (ret) { + dev_err(&client->dev, "failed to start streaming\n"); + goto exit; + } + + /* + * Users are not allowed to access OTP-related registers and memory + * during the 20 ms period after streaming starts (0x100 = 0x01). + */ + msleep(20); + + ret = regmap_bulk_read(nvm->regmap, OV2740_REG_OTP_CUSTOMER, + nvm->nvm_buffer, CUSTOMER_USE_OTP_SIZE); + if (ret) { + dev_err(&client->dev, "failed to read OTP data, ret %d\n", ret); + goto exit; + } + + ov2740_write_reg(ov2740, OV2740_REG_MODE_SELECT, 1, + OV2740_MODE_STANDBY); + ov2740_write_reg(ov2740, OV2740_REG_ISP_CTRL01, 1, isp_ctrl01); + ov2740_write_reg(ov2740, OV2740_REG_ISP_CTRL00, 1, isp_ctrl00); + +exit: + return ret; +} + +static int ov2740_nvmem_read(void *priv, unsigned int off, void *val, + size_t count) +{ + struct nvm_data *nvm = priv; + + memcpy(val, nvm->nvm_buffer + off, count); + + return 0; +} + +static int ov2740_register_nvmem(struct i2c_client *client) +{ + struct nvm_data *nvm; + struct regmap_config regmap_config = { }; + struct nvmem_config nvmem_config = { }; + struct regmap *regmap; + struct device *dev = &client->dev; + int ret = 0; + + nvm = devm_kzalloc(dev, sizeof(*nvm), GFP_KERNEL); + if (!nvm) + return -ENOMEM; + + regmap_config.val_bits = 8; + regmap_config.reg_bits = 16; + regmap_config.disable_locking = true; + regmap = devm_regmap_init_i2c(client, ®map_config); + if (IS_ERR(regmap)) + return PTR_ERR(regmap); + + nvm->regmap = regmap; + + nvmem_config.name = dev_name(dev); + nvmem_config.dev = dev; + nvmem_config.read_only = true; + nvmem_config.root_only = true; + nvmem_config.owner = THIS_MODULE; + nvmem_config.compat = true; + nvmem_config.base_dev = dev; + nvmem_config.reg_read = ov2740_nvmem_read; + nvmem_config.reg_write = NULL; + nvmem_config.priv = nvm; + nvmem_config.stride = 1; + nvmem_config.word_size = 1; + nvmem_config.size = CUSTOMER_USE_OTP_SIZE; + + nvm->nvmem = devm_nvmem_register(dev, &nvmem_config); + if (IS_ERR(nvm->nvmem)) + return PTR_ERR(nvm->nvmem); + + nvm->nvm_buffer = devm_kzalloc(dev, CUSTOMER_USE_OTP_SIZE, GFP_KERNEL); + if (!nvm->nvm_buffer) + return -ENOMEM; + + ret = ov2740_load_otp_data(client, nvm); + if (ret) + dev_err(dev, "failed to load OTP data, ret %d\n", ret); + + return ret; +} + static int ov2740_probe(struct i2c_client *client) { struct ov2740 *ov2740; @@ -964,6 +1105,10 @@ static int ov2740_probe(struct i2c_client *client) goto probe_error_media_entity_cleanup; } + ret = ov2740_register_nvmem(client); + if (ret) + dev_err(&client->dev, "register nvmem failed, ret %d\n", ret); + /* * Device is already turned on by i2c-core with ACPI domain PM. * Enable runtime PM and turn off the device. @@ -988,20 +1133,18 @@ static const struct dev_pm_ops ov2740_pm_ops = { SET_SYSTEM_SLEEP_PM_OPS(ov2740_suspend, ov2740_resume) }; -#ifdef CONFIG_ACPI static const struct acpi_device_id ov2740_acpi_ids[] = { {"INT3474"}, {} }; MODULE_DEVICE_TABLE(acpi, ov2740_acpi_ids); -#endif static struct i2c_driver ov2740_i2c_driver = { .driver = { .name = "ov2740", .pm = &ov2740_pm_ops, - .acpi_match_table = ACPI_PTR(ov2740_acpi_ids), + .acpi_match_table = ov2740_acpi_ids, }, .probe_new = ov2740_probe, .remove = ov2740_remove, |