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

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>

diff --git a/drivers/power/pmic/i2c_pmic_emul.c b/drivers/power/pmic/i2c_pmic_emul.c
index c0b5309..61fa76a 100644 (file)
--- a/drivers/power/pmic/i2c_pmic_emul.c
+++ b/drivers/power/pmic/i2c_pmic_emul.c
@@ -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;
 }