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sandbox: Rewrite i2c_pmic_emul.c to support PMIC with 3 bytes transmission

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This change enables support for MC34708 PMIC in sandbox. Now we can
emulate the I2C transfers larger than 1 byte.

Notable changes for this driver:

- From now on the register number is not equal to index in the buffer,
  which emulates the PMIC registers

- The PMIC register's pool is now dynamically allocated up till
  64 regs * 3 bytes each = 192 B

Signed-off-by: Lukasz Majewski <lukma@denx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Lukasz Majewski 2018-05-15 16:26:39 +02:00 • committed by Stefano Babic
parent d4505c8e0d
commit a65e644033
1 changed files with 31 additions and 14 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

45
drivers/power/pmic/i2c_pmic_emul.c
View file

@ -18,8 +18,11 @@
* @reg: PMICs registers array
*/
struct sandbox_i2c_pmic_plat_data {
u8 rw_reg;
u8 reg[SANDBOX_PMIC_REG_COUNT];
u8 rw_reg, rw_idx;
u8 reg_count;
u8 trans_len;
u8 buf_size;
u8 *reg;
};
static int sandbox_i2c_pmic_read_data(struct udevice *emul, uchar chip,
@ -27,16 +30,16 @@ static int sandbox_i2c_pmic_read_data(struct udevice *emul, uchar chip,
{
struct sandbox_i2c_pmic_plat_data *plat = dev_get_platdata(emul);
if (plat->rw_reg + len > SANDBOX_PMIC_REG_COUNT) {
if (plat->rw_idx + len > plat->buf_size) {
pr_err("Request exceeds PMIC register range! Max register: %#x",
SANDBOX_PMIC_REG_COUNT);
plat->reg_count);
return -EFAULT;
}
debug("Read PMIC: %#x at register: %#x count: %d\n",
(unsigned)chip & 0xff, plat->rw_reg, len);
debug("Read PMIC: %#x at register: %#x idx: %#x count: %d\n",
(unsigned int)chip & 0xff, plat->rw_reg, plat->rw_idx, len);
memcpy(buffer, &plat->reg[plat->rw_reg], len);
memcpy(buffer, plat->reg + plat->rw_idx, len);
return 0;
}
@ -53,9 +56,10 @@ static int sandbox_i2c_pmic_write_data(struct udevice *emul, uchar chip,
/* Set PMIC register for I/O */
plat->rw_reg = *buffer;
plat->rw_idx = plat->rw_reg * plat->trans_len;
debug("Write PMIC: %#x at register: %#x count: %d\n",
(unsigned)chip & 0xff, plat->rw_reg, len);
debug("Write PMIC: %#x at register: %#x idx: %#x count: %d\n",
(unsigned int)chip & 0xff, plat->rw_reg, plat->rw_idx, len);
/* For read operation, set (write) only chip reg */
if (next_is_read)
@ -64,12 +68,12 @@ static int sandbox_i2c_pmic_write_data(struct udevice *emul, uchar chip,
buffer++;
len--;
if (plat->rw_reg + len > SANDBOX_PMIC_REG_COUNT) {
if (plat->rw_idx + len > plat->buf_size) {
pr_err("Request exceeds PMIC register range! Max register: %#x",
SANDBOX_PMIC_REG_COUNT);
plat->reg_count);
}
memcpy(&plat->reg[plat->rw_reg], buffer, len);
memcpy(plat->reg + plat->rw_idx, buffer, len);
return 0;
}
@ -100,20 +104,33 @@ static int sandbox_i2c_pmic_xfer(struct udevice *emul, struct i2c_msg *msg,
static int sandbox_i2c_pmic_ofdata_to_platdata(struct udevice *emul)
{
struct sandbox_i2c_pmic_plat_data *plat = dev_get_platdata(emul);
struct udevice *pmic_dev = dev_get_parent(emul);
struct uc_pmic_priv *priv = dev_get_uclass_priv(pmic_dev);
const u8 *reg_defaults;
debug("%s:%d Setting PMIC default registers\n", __func__, __LINE__);
plat->reg_count = pmic_reg_count(pmic_dev);
plat->trans_len = priv->trans_len;
plat->buf_size = plat->reg_count * plat->trans_len;
plat->reg = calloc(1, plat->buf_size);
if (!plat->reg) {
debug("Canot allocate memory (%d B) for PMIC I2C emulation!\n",
plat->buf_size);
return -ENOMEM;
}
reg_defaults = dev_read_u8_array_ptr(emul, "reg-defaults",
SANDBOX_PMIC_REG_COUNT);
plat->buf_size);
if (!reg_defaults) {
pr_err("Property \"reg-defaults\" not found for device: %s!",
emul->name);
free(plat->reg);
return -EINVAL;
}
memcpy(&plat->reg, reg_defaults, SANDBOX_PMIC_REG_COUNT);
memcpy(plat->reg, reg_defaults, plat->buf_size);
return 0;
}