[PATCH v2 08/16] hwmon: (mr75203) add VM active channel support

Eliav Farber
2022-08-17T05:43:54Z

Add active channel support per VM, which is useful when not all VM
channels are used.
Number of active channel is read from device-tree.
When absent in device-tree, all channels are assumed to be used.
Setting number of active channels to 0, means that entire VM sesnor is
not used (this can partially replace the "intel,vm-map" functionality).

Signed-off-by: Eliav Farber <farbere@amazon.com>
---
drivers/hwmon/mr75203.c | 94 +++++++++++++++++++++++++++++++----------
1 file changed, 72 insertions(+), 22 deletions(-)

diff --git a/drivers/hwmon/mr75203.c b/drivers/hwmon/mr75203.c
index 4419e481d47c..2e6139c09efc 100644
--- a/drivers/hwmon/mr75203.c
+++ b/drivers/hwmon/mr75203.c
@@ -30,6 +30,8 @@
#define CH_NUM_MSK GENMASK(31, 24)
#define CH_NUM_SFT 24

+#define VM_NUM_MAX (VM_NUM_MSK >> VM_NUM_SFT)
+
/* Macro Common Register */
#define CLK_SYNTH 0x00
#define CLK_SYNTH_LO_SFT 0
@@ -107,6 +109,11 @@
#define PVT_N_CONST 90
#define PVT_R_CONST 245805

+struct voltage_device {
+ u8 vm_map;
+ u8 ch_map;
+};
+
struct pvt_device {
struct regmap *c_map;
struct regmap *t_map;
@@ -114,12 +121,13 @@ struct pvt_device {
struct regmap *v_map;
struct clk *clk;
struct reset_control *rst;
+ struct voltage_device *vd;
u32 t_num;
u32 p_num;
u32 v_num;
- u32 c_num;
u32 ip_freq;
- u8 *vm_idx;
+ u8 vm_ch_max;
+ u8 vm_ch_total;
};

static umode_t pvt_is_visible(const void *data, enum hwmon_sensor_types type,
@@ -186,11 +194,11 @@ static int pvt_read_in(struct device *dev, u32 attr, int channel, long *val)
u8 ch_idx;
int ret;

- if (channel >= pvt->v_num * pvt->c_num)
+ if (channel >= pvt->vm_ch_total)
return -EINVAL;

- vm_idx = pvt->vm_idx[channel / pvt->c_num];
- ch_idx = channel % pvt->c_num;
+ vm_idx = pvt->vd[channel].vm_map;
+ ch_idx = pvt->vd[channel].ch_map;

switch (attr) {
case hwmon_in_input:
@@ -390,7 +398,7 @@ static int pvt_init(struct pvt_device *pvt)
if (ret)
return ret;

- val = GENMASK(pvt->c_num - 1, 0) | VM_CH_INIT |
+ val = GENMASK(pvt->vm_ch_max - 1, 0) | VM_CH_INIT |
IP_POLL << SDIF_ADDR_SFT |
SDIF_WRN_W | SDIF_PROG;
ret = regmap_write(v_map, SDIF_W, val);
@@ -519,7 +527,7 @@ static int pvt_reset_control_deassert(struct device *dev, struct pvt_device *pvt
static int mr75203_probe(struct platform_device *pdev)
{
const struct hwmon_channel_info **pvt_info;
- u32 ts_num, vm_num, pd_num, ch_num, val, index, i;
+ u32 ts_num, vm_num, pd_num, ch_num, val, index, i, j, k;
struct device *dev = &pdev->dev;
u32 *temp_config, *in_config;
struct device *hwmon_dev;
@@ -569,7 +577,6 @@ static int mr75203_probe(struct platform_device *pdev)
pvt->t_num = ts_num;
pvt->p_num = pd_num;
pvt->v_num = vm_num;
- pvt->c_num = ch_num;
val = 0;
if (ts_num)
val++;
@@ -606,43 +613,86 @@ static int mr75203_probe(struct platform_device *pdev)
}

if (vm_num) {
- u32 total_ch = ch_num * vm_num;
+ u8 vm_idx[VM_NUM_MAX];
+ u8 vm_active_ch[VM_NUM_MAX];

ret = pvt_get_regmap(pdev, "vm", pvt);
if (ret)
return ret;

- pvt->vm_idx = devm_kcalloc(dev, vm_num, sizeof(*pvt->vm_idx),
- GFP_KERNEL);
- if (!pvt->vm_idx)
- return -ENOMEM;
-
- ret = device_property_read_u8_array(dev, "intel,vm-map",
- pvt->vm_idx, vm_num);
+ ret = device_property_read_u8_array(dev, "intel,vm-map", vm_idx,
+ vm_num);
if (ret) {
/*
* Incase intel,vm-map property is not defined, we
* assume incremental channel numbers.
*/
for (i = 0; i < vm_num; i++)
- pvt->vm_idx[i] = i;
+ vm_idx[i] = i;
} else {
for (i = 0; i < vm_num; i++)
- if (pvt->vm_idx[i] >= vm_num ||
- pvt->vm_idx[i] == 0xff)
+ if (vm_idx[i] >= vm_num || vm_idx[i] == 0xff)
break;

vm_num = i;
pvt->v_num = i;
}

- in_config = devm_kcalloc(dev, total_ch + 1,
+ ret = device_property_read_u8_array(dev, "vm-active-channels",
+ vm_active_ch, vm_num);
+ if (ret) {
+ /*
+ * Incase vm-active-channels property is not defined,
+ * we assume each VM sensor has all of its channels
+ * active.
+ */
+ for (i = 0; i < vm_num; i++)
+ vm_active_ch[i] = ch_num;
+
+ pvt->vm_ch_max = ch_num;
+ pvt->vm_ch_total = ch_num * vm_num;
+ } else {
+ for (i = 0; i < vm_num; i++) {
+ if (vm_active_ch[i] > ch_num) {
+ dev_err(dev,
+ "invalid active channels: %u\n",
+ vm_active_ch[i]);
+ return -EINVAL;
+ }
+
+ pvt->vm_ch_total += vm_active_ch[i];
+
+ if (vm_active_ch[i] > pvt->vm_ch_max)
+ pvt->vm_ch_max = vm_active_ch[i];
+ }
+ }
+
+ /*
+ * Map between the channel-number to VM-index and channel-index.
+ * Example - 3 VMs, vm_active_ch = [05 02 04]:
+ * vm_map = [0 0 0 0 0 1 1 2 2 2 2]
+ * ch_map = [0 1 2 3 4 0 1 0 1 2 3]
+ */
+ pvt->vd = devm_kcalloc(dev, pvt->vm_ch_total, sizeof(*pvt->vd),
+ GFP_KERNEL);
+ if (!pvt->vd)
+ return -ENOMEM;
+
+ k = 0;
+ for (i = 0; i < vm_num; i++)
+ for (j = 0; j < vm_active_ch[i]; j++) {
+ pvt->vd[k].vm_map = vm_idx[i];
+ pvt->vd[k].ch_map = j;
+ k++;
+ }
+
+ in_config = devm_kcalloc(dev, pvt->vm_ch_total + 1,
sizeof(*in_config), GFP_KERNEL);
if (!in_config)
return -ENOMEM;

- memset32(in_config, HWMON_I_INPUT, total_ch);
- in_config[total_ch] = 0;
+ memset32(in_config, HWMON_I_INPUT, pvt->vm_ch_total);
+ in_config[pvt->vm_ch_total] = 0;
pvt_in.config = in_config;

pvt_info[index++] = &pvt_in;
--
2.37.1